What are alkali metals

Answers

Answer 1

Answer:

Alkali metals are highly reactive elements that appear to be silver and they are found in group 1 of the periodic table.  It consists of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).  As you go further down the group, the more reactive they are.  Those elements all react to water and air, so they must be kept in oil to preserve their state.  

Answer 2
Alkali metals are any of the elements lithium, sodium, potassium, rubidium, cuisine, and francium, occupying Group 1A (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.

Related Questions

Which of the following best describes hair? O Hair is made of mostly tightly packed living cells Hair does not help control body temperature. O Hair growth occurs in the hair follicle O Hair grows at 2.5mm a month.​

Answers

Answer:

(A) Hair is made of mostly tightly packed living cells.

Explanation:

i just took the exam :) yw

a like would be nice thanks!

Answer:

A

Explanation:

Just did the exam :) Good Luck!

Part 1)
There is a storage container with 5.25 tons of Ammonia (NH3). How many molecules of Ammonia are there?

Answers

Answer:

1.69×10²⁹ molecules.

Explanation:

The following data were obtained from the question:

Mass of Ammonia (NH3) = 5.25 tons

Molecules of Ammonia (NH3) =.?

Next, we shall convert 5.25 tons to grams (g). This can be obtained as follow:

1 ton = 907184.74 g

Therefore,

5.25 ton = 5.25 ton × 907184.74 g / 1 ton

5.25 ton = 4762719.885 g

Therefore, 5.25 tons is equivalent to 4762719.885 g

Finally, we shall determine the number of molecules of ammonia, NH3 in 4762719.885 g. This can be obtained as follow:

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of ammonia, NH3 also contains 6.02×10²³ molecules.

1 mole of ammonia, NH3 = 14 + (3x1) = 14 + 3 = 17 g

17 g of ammonia, NH3 contains 6.02×10²³ molecules.

Therefore, 4762719.885 g of ammonia, NH3 will contain = (4762719.885 × 6.02×10²³) / 17 = 1.69×10²⁹ molecules.

From the calculations made above,

5.25 tons (4762719.885 g) of ammonia, NH3 contains 1.69×10²⁹ molecules.

Fill in the blanks: a substance that undergoes a ______ change will always result in something new that has ________ properties than what it started out as. A- physical and different. b- physical and same. C-chemical and different. D chemical and same

Answers

The answer is C. When an object undergoes a physical change, its properties are different.

What is the atomic number of an atom?
O the number of neutrons
O the number of electrons and neutrons
O the number of protons
the number protons and neutrons

Answers

The answer is the number of protons. I hope this helps
An atom is classified by how many protons it has.

Changes in the number of neutrons will change the individual isotope of that element that the atom is, but the atomic number is always equal to the number of protons.

Also, protons + neutrons = mass number, not atomic number!

What are natural resources

Answers

Answer:

resources that come from the ground or eath naturally which also means that those minerals like coal take hundreds of years to be created

In reality, energy conversion from burning fuel is never 100% efficient. Significant loss of energy due to heating occurs. If the generator were only 20% efficient (which is more realistic), how much energy in joules would be converted to electrical energy and how much would be lost to heat? (2 points)​

Answers

Answer:

Electrical energy = 130000000 J and Heat energy = 520000000 J

Explanation:

Multiply the amount of joules from the last question (650000000) by .20 and .80. (Which are the percentages)

How would a flood be a limitation for synthetic polymers that rely on natural rubber in its production?

Answers

Answer:

A flood  would affect the availability of a material used in making a synthetic polymer. If a flood destroys rubber trees, the availability of natural rubber would decrease, which would in turn decrease the production of synthetic polymers.

Explanation: I just did it

Answer:  Sample Response:     A flood  would affect the availability of a material used in making a synthetic polymer. If a flood destroys rubber trees, the availability of natural rubber would decrease, which would in turn decrease the production of synthetic polymers.

Explanation:

The volume of a candy bar is 55cm^3. The mass of the candy bar is 70g. What is the density of the candy bar in g/cm^3

Answers

Answer:

1.3 g/cm3

Explanation:

Name for each compoud
1.CO
2.H2SO4
3CaCO3
4 H202
5NaF

Answers

1. Carbon monoxide
2. Sulfuric acid
3. Calcium carbonate
4. Hydrogen peroxide
5. Sodium fluoride
hope this helps (:

A student lives in an apartment complex next to a park and train tracks. The student observes that they can hear the train coming sooner and from farther away when they are in front of their apartment and can only barely hear the train when they are in the park despite both being the same distance from the railroad tracks.





The student developed the model above. Using the model, identify two potential wave phenomena that occur and are the reason behind why the student can only hear the train in front of the apartment complex.



A.
The train can be heard more easily in front of the apartment complex because of reflection and interference. As the sound comes from the train, the sound waves reflect off of the complex and interfere with each other increasing the amplitude of the wave to make it easier to hear.

B.
The train can not be heard as easily in the park because of reflection and diffraction. The sound reflects off of the trees in the park and diffract between the trees, this causes the waves to bend too much to be heard.

C.
The train can be heard more easily in front of the apartment complex because of diffraction and refraction. The sound waves diffract between the other buildings aiming them towards the apartment complex and then the sound refracts through the apartment complex which makes it more difficult to hear in the park.

D.
The train can not be heard as easily in the park because of interference and reflection. The other buildings in front of the park cause interference of the sound waves from the train and the trees in the park cause reflection making it too hard to hear the train.

Answers

Answer:

The answer is A

Explanation:

8.90 kg is what in grams​

Answers

Answer:

It would be 8900 grams

Answer:

8900 Grams

Explanation:

1 kg = 1000 grams

8.90 x 1000=8900


An element, X, has 2 isotopes, X-32 with an abundance of 31.5% and X-35 with an abundance
of 68.5%. What is the average atomic mass of element X?

Answers

Answer:

amu = 34.055 or 34.1

Explanation:

to calculate the average mass, first convert the percentages into decimals. Then, calculate the mass numbers. To get this number, multiply the decimal by the mass number for each isotope and, then add them together.

( 0.315 x 32 ) + (0.685 x 35 ) = 34.055

What elements do these macromolecules
have in common?
Copper, Helium, Oxygen
Carbon, Hydrogen, Oxygen
Calcium, Hydrogen, Oxygen
Carbon, Helium, Oxygen

Answers

Answer:

Carbon, Hydrogen, Oxygen

Explanation:

From the prefix "macro" which means large, macromolecules are considered to be "large molecules" when compared to the micromolecules. They come in four major types: proteins, nucleic acids, carbohydrates and lipids.

These macromolecules have three common elements and these are: Carbon, Hydrogen and Oxygen. These are all essential in the vitality of life. The human body is said to have 10% of carbon and 63% oxygen. Hydrogen, on the other hand, is said to be the most abundant element among organic molecules.

which of the following elements would decrease in size when it became an ion

Answers

Answer:

nickel, cobalt would decrease in size when it became an iron

GIVING 5 STARS AND BRAINLY IF YOU ANSWER FIRST AND CORRECTLY
Please answer asap. Thank you.

QUESTION:

How many total elements are involved in the process of photosynthesis?

A. 2
B. 3
C. 4
D. 5

Answers

3 there are three different chemical symbols on each side of the equation

What is metamorphosis in the life cycle of a frog?

Answers

Answer:

Metamorphosis is the change in shape of a frog.

Explanation:

For example, it's like when the tadpole develops legs. That tadpole is going through metamorphosis to grow those legs.

What is tetanus? What are the symptoms and consequences of the disease? Who is at risk of developing tetanus? How do vaccines work? What is the history of the tetanus vaccine? Who should receive the tetanus vaccine? When should people receive the tetanus vaccine? Why is this schedule important? Has there been a change in tetanus incidence in the United States since the vaccine became available? What are the risks of vaccination versus non-vaccination? Do the risks outweigh the benefits? Are there areas in the world in which tetanus is prevalent? If so, does this affect the recommendations for US vaccination?

Answers

Answer:

The tetanus vaccine is a dose of the bacterium Clostridium Tetani, in inactive form or even a surface molecule that helps the body to actively form the antibody.

The tetanus vaccine has coverage for life, it is mandatory in those countries where the disease became common, such as the USA, Argentina, Chile, Uruguay among others.

Before a surgical act or a suspicion of exposure with this bacterium, the booster of the tetanus vaccine should be administered quickly.

Explanation:

Tetanus disease generates a tetanization of all the muscles of the organism, generating spasmodic contractions, which make it impossible to function and develop life when it affects the diaphragm as it makes breathing impossible.

Tetanization does not affect differently in age or sex, it only consists of contamination with the bacteria to be sufficient.

The sources of contagion are areas of mud or earth, rusty cutting or sharp elements, and poorly hygienic or abandoned areas. In order for the bacteria to be transmitted or the transmission route to be fulfilled, there must be a lesion of loss of continuity of the epithelium or mucosa.

Which describes the elements in a given group of the periodic table?

They decrease in atomic mass as you go down the column.
They increase sequentially in atomic number from top to bottom.
They are in the same family, with similar characteristics.
Their properties change according to a pattern as you go down the column.

Answers

Answer:

They are in the same family, with similar characteristics.

Explanation:

The elements in a given group of the periodic table are in the same family and with similar characteristics.

Vertical columns on the periodic table are referred to as a group or family. Elements having the same number of electrons in the outermost shell of their atoms are placed one another in vertical columns. Each resulting vertical column is a group or family. Elements in the same group exhibit similar chemical properties because of the same number of electrons in their atoms' valence shells.

The valency of sodium metal

Answers

Answer:

The atomic number of sodium is 11 (Z=11). The electronic configuration of sodium can be written as 2, 8, 1. Therefore, valence electron in sodium is 1 and it needs to lose 1 electron from the outermost orbit to attain octet. Hence, the valency of sodium is 1.

Explanation:

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What is the formula for an alkene containing six carbon atoms?
A. C6H10
B. C2H6
C. C6H12
D. C5H12

Answers

Answer:

C

Explanation:

Cyclohexane is a cycloalkane with the molecular formula C₆H₁₂. Cyclohexane is non-polar.

One way to separate the different kinds of matter in a mixture is through


A. filteration
B. decomposition
C. electrolysis
D. chemical reactions

Answers

The answer is filtration (A).

Creating a mixture is a physical process; as such, the substances that make up a true mixture do not undergo any chemical reactions with one another. It follows, then, that to separate substances that are mixed together, the process to use would be physical, not chemical. Filtration fits that bill: Solutes that do not dissolve in the solvent can be trapped, for example, by a fine mesh whose openings are large enough for the solvent to pass through but too small for the undissolved solute(s) to do so.

Choices B, C, and D are all chemical processes.

Decomposition (B) is the breakdown of a substance into chemically distinct fragments. For example, hydrogen peroxide in a mixture (solution) with water decomposes in the presence of an appropriate catalyst—the products you are left with are water and oxygen gas, which bubbles out of the mixture. But you haven’t separated the hydrogen peroxide from the water—through decomposition, the hydrogen peroxide molecules are broken up and the atoms rearranged to form different molecules. There’s no hydrogen peroxide left to separate anymore. So, decomposition doesn’t separate different substances in a mixture—it transforms them.

Electrolysis (C) is a chemical process that uses an electric current to drive the movement of charged particles (electrons and ions) through a conductive medium. Suffice it to say that this will almost certainly change the chemistry of a mixture. For example, assume you’ve got a mixture of some inert, insoluble solute in water. If you run a very strong electric current through water, you’ll end up decomposing the water molecules themselves into oxygen and hydrogen gases. Again, you haven’t technically separated the solute from the mixture because separation implies that you have the separated substances still around. In this example, you’ve “separated” your solute by chemically transforming your solvent into two different gases; one part of your mixture no longer exists. (Side note: electrolysis of pure water takes quite a bit of energy; on the other hand, tap water, which contains dissolved electrolytes, can be readily decomposed via electrolysis using the current delivered by a standard alkaline battery.)

As a rule of thumb, the suffix (–lysis) usually indicates chemical decomposition, and the stem that precedes the suffix usually indicates what the decomposition process involves. Examples include electrolysis (as we just discussed), hydrolysis (breaking a chemical bond using water), glycolysis (the biochemical process of breaking down glucose into smaller molecules to harness the energy released), and radiolysis (splitting a bond within atoms comprising a molecule using ionizing radiation).

Finally, as should be clear by this point, chemical reactions are not the way to go about separating mixtures. Again, the chemical substances in a mixture retain their chemical identities. Separating the constituents of a mixture essentially entails isolating these substances. Filtration can and does isolate solutes from solvents without altering their chemical identities (assuming the filter itself is chemically inert). A chemical reaction changes a substances chemical identity, and so could not properly be regarded as a method of separation, and only separation.

One way to separate the different kinds of matter in a mixture is through filtration. The correct option is A.

What is filtration?

Filtration is a physical or mechanical process by which two or more substances are of different compositions. These substances can be solid, liquid, or gas.

There are three types of filtration. These are mechanical, chemical, and biological. The different types of filtration are based on a similar principle, which is a mixture of several types poured onto a filter membrane. A specific size of the pore is present in the filter membrane.

The other options are decomposition, which is a process of breaking down substances. Electrolysis is separating charged ions and chemical reactions to form compounds.

Thus, the correct option is A. filtration.

To learn more about filtration, refer to the link:

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Provided is a diagram showing forces on a box.
Left
Right
40 Newtons
35 Newtons
What is the net force on the box?
SN Leht
O5N Right
75 N Let
O 75 N Right

please hurry i’m taking a test

Answers

Answer:

5 N left

Explanation:

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Iron is a
homogenous mixture
O heterogeneous mixture
O element
compound

Answers

Answer:

element

Explanation:

Your science teacher removed the gas from a birthday balloon. They discovered that the gas is made of the element helium. Inside that atom is:
A. A new substance
B. Protons, neutrons and electrons
C. A different element
D. All of the above

Answers

D is the answer I think
The answer would be “B” because a substance and element represent a structure larger than a single atom. Please mark as Brainliest answer!

6. Now, revise your definition for waves to include energy and matter.

A wave is a phenomenon that...

Answers

Answer:

A wave is phenomenon that transfers energy from one point to another through a disturbance without affecting the matter.

Explanation:

A wave is phenomenon that transfers energy from one point to another through a disturbance without affecting the matter.

There are two main types of waves Longitudinal waves travels parallel to their source. For example, sound waves. Through a series of rarefactions and compressions, longitudinal waves are propagated. Transverse waves travel perpendicular to their source.

If carbon monoxide (CO) leaked into your home, would you predict that if would float to the
top of the room or stay near the floor? Answer the same question for carbon dioxide (CO2),
would it float or sink?

Answers

Answer: It will sink

Explanation:

To solve this we must be knowing each and every concept related to carbon monoxide. Therefore, carbon monoxide float to the top of the room.

What is carbon monoxide?

When the carbon in fuels burns inefficiently, a toxic gas known as carbon monoxide is created. It is emitted both naturally—from forest fires or volcanic eruptions, for example—and artificially—through procedures. It is lighter than the air.

By attaching to and removing oxygen from myoglobin, carbon monoxide reduces the oxygen storage capacity in muscle cells, which is another way it upsets the body's processes. If carbon monoxide (CO) leaked into your home, carbon monoxide float to the top of the room. Numerous manufacturing and medicinal items employ carbon monoxide.

Therefore, carbon monoxide float to the top of the room.

To know more about carbon monoxide, here:

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Using the reaction below: 2 CO2(g) + 2 H2O(l) → C2H4(g) + 3 O2(g) ΔHrxn= +1411.1 kJ What would be the heat of reaction for this reaction? 0.5 C2H4(g) + 1.5 O2(g) → CO2(g) + H2O(l) ΔHrxn= ??? KJ Question 6 options: a) Not enough information is given b) -2822.2 kJ c) +1411.1 kJ d) -705.55 kJ e) -1411.1 kJ

Answers

Answer:  d) -705.55 kJ

Explanation:

Heat of reaction is the change of enthalpy during a chemical reaction with all substances in their standard states.

[tex]2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g)[/tex] [tex]\Delta H=+1411.1kJ[/tex]

Reversing the reaction, changes the sign of [tex]\Delta H[/tex]

[tex]C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)[/tex]

[tex]\Delta H=-1411.1kJ[/tex]

On multiplying the reaction by [tex]\frac{1}{2}[/tex] , enthalpy gets half:

[tex]0.5C_2H_4(g)+1.5O_2(g)\rightarrow CO_2(g)+H_2O(l)[/tex][tex]\Delta H=\frac{1}{2}\times -1411.1kJ=-705.55kJ/mol[/tex]

Thus the enthalpy change for the given reaction is -705.55kJ

helppppppppppppp plzzzzzzzz Identify each structure based on its label.

Compound A is a
amine.
Compound B is a
amine.
Compound C is a
amine.
Compound D is
.

Answers

A I hope it helps :)

Answer:

kldja

Explanation:

A.) primary

B.) tertiary

C.) secondary

D.) ammonia

edge2020

1. 4.5 cm = __________ Km
2. 34⁰C = __________ Kelvin
3. 195kg = __________ lb
7. 108⁰F =__________ ⁰C
8. 63.2 m =__________ mm
if you can solve this for me I'd gladly appreciate it

Answers

Answer:

1. 0.000045km

2. 307.15 Kelvin

3. 429.9014lb

7. 42.22222 celcius

8. 63200 mm

What accounts for the attractions in a chemical bond?

Answers

Answer:

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

Explanation:

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Why were Anne Hutchinsons ideas so upsetting to the leaders of Massachusetts Bay Colony?A) She threatened to start her own colony.B( She encouraged women to leave the Church. C)She argued for a separation of church and state.D) She challenged the authority of men in the colony. which characteristics did the totalitarian regimes of Germany Italy and the Soviet Union have in common? select three options What does the underlined phrase mean in the following sentence?Meine Eltern wollen oft ins Museum gehen.to go to the museumto get into the museumto buy the museumto insure the museum PLZ HELP I AM STRESSEDRead this excerpt from the article "Clemente's Impact Wanes in Puerto Rico 40 Years After His Death."His impact extended through Latin America, where he was hailed as the Latino Jackie Robinson. Since 1973, Major League Baseball has handed out a Roberto Clemente Award to the player who embodies his combination of on-field excellence and community involvement.Which is the best source to use to enhance the information in this excerpt?a magazine article about Jackie Robinsons careera video of Roberto Clementes baseball highlightsa website advertising Major League Baseball gamesa website describing Roberto Clemente award winners Circle A has a diameter of 9 , Circle B has a radius of 5 , how many centimeters larger is it ? ILL GIVE BRAINLIEST! How did Allied leaders at the Paris Peace Conference punish Germany?A.) They took control of various German cities and farmland.B.) They divided Germany into different zones of occupation.C.) They transported German factories back to their countries.D.) They made Germany accept blame for the war and pay reparations. Case Inc. is a construction company specializing in custom patios. The patios are constructed of concrete, brick, fiberglass, and lumber, depending upon customer preference. On June 1, 2017, the general ledger for Case Inc. contains the following data.Raw Materials Inventory $4,200 Manufacturing Overhead Applied $32,640Work in Process Inventory $5,540 Manufacturing Overhead Incurred $31,650Subsidiary data for Work in Process Inventory on June 1 are as follows.Job Cost Sheets Customer Job Cost Element Rodgers Stevens Linton Direct materials $600 $800 $900Direct labor 320 540 580Manufacturing overhead 400 675 725 $1,320 $2,015 $2,205 During June, raw materials purchased on account were $4,900, and all wages were paid. Additional overhead costs consisted of depreciation on equipment $900 and miscellaneous costs of $400 incurred on account. A summary of materials requisition slips and time tickets for June shows the following.Customer Job Materials Requisition Slips Time TicketsRodgers $800 $850Koss 2,000 800Stevens 500 360Linton 1,300 1,200 Rodgers 300 390 4,900 3,600General use 1,500 1,200 $6,400 $4,800 Overhead was charged to jobs at the same rate of $1.25 per dollar of direct labor cost. The patios for customers Rodgers, Stevens, and Linton were completed during June and sold for a total of $18,900. Each customer paid in full.InstructionsJournalize the June transactions: (1) for purchase of raw materials, factory labor costs incurred, and manufacturing overhead cost incurred; (2) assignment of direct materials, labor, and overhead to production; and (3) completion of jobs and sale of goods.Post the entries to Work in Process Inventory.Reconcile the balance in Work in Process Inventory with the costs of unfinished jobs.Prepare a cost of goods manufactured schedule for June. Which is a chemical property of milkA. 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In about how many hours will the snowfall of the towns be equal? The coniferous forests of Mexico are home to many species of migratory __________.A.jaguarsB.butterfliesC.anacondasD.tapirsABCD 3/2x + 8= -1 solve equation List the 1st verse and chorus of make it rain will mark brainliest the three basic skills needed for effective communication are Which statement best explains why the air pressure is greater at the poles than at the equator Analyzing Unearned Revenue DisclosuresThe following disclosures (excerpted) are from the August 28, 2016, annual report of Costco Wholesale Corporation.Revenue Recognition: We generally recognize sales, net of estimated returns, at the time the member takes possession of merchandise or receives services. When we collect payment from customers prior to the transfer of ownership of merchandise or the performance of services, the amount recieved is generally recorded as deferred revenue on the consolidated balance sheets until the sales or service is completed. Membership fee revenue represents annual membership fees paid by our memberships. We account for membership fee revenue, net of estimated refunds, on a deferred basis, whereby revenue is recognized ratably over the one-year membership period.Revenue($ millions) August 28, 2016 August 30, 2015 August 31, 2014Net Sales $116,073 $113,666 $110,212Membership fees 2,646 2,533 2,428Total revenue $118,719 $116,199 $112,640Current Liabilities ($ millions) August 28, 2016 August 30, 2015Accounts payable $7,612 $9,011Current portion of long-term debt 1,100 1,283Accrued salaries and benefits 2,629 2,468Accured member rewards 869 813Deferred membership fees 1,362 1,269Other current liabilities 2,003 1,695Total current liabilities $15,575 $16,539(a) Which of the following statements best explains in layman terms how Costco accounts for the cash received for its membership fees?Because Costco does not know how many of its members will continue to the end of the year, cash received from members is recorded as a liability and recognized as revenue only at year-end.When it receives cash, the company records it as a current liability. Then, it recognizes revenue evenly over the year.The company records revenue when the cash is received.Because Costco has a refund policy, the company records revenue when the cash is received, less an allowance for expected membership terminations.Mark 1.00 out of 1.00(b) Use the balance sheet information on Costco's Deferred Membership Fees liability account and its income statement revenues related to Membership Fees earned during 2016 to compute the cash that Costco received during 2016 for membership fees.Total cash received (in $ millions) = $Answer(c) Use the financial statement effects template to show the effect of the cash Costco received during 2016 for membership fees and the recognition of membership fees revenue for 2016.Use negative signs with answers, when appropriate.Balance SheetTransaction ($ millions)Cash Asset + Noncash Assets = Liabilities + Contributed Capital + Earned Capital Receive cash in advance for membership fees Answer Answer Answer Answer Answer Recognized membership fees earned Answer Answer Answer Answer Answer Income StatementRevenue - Expenses = Net IncomeAnswer Answer AnswerAnswer Answer AnswerFeedbackYou have correctly selected 15.Partially correctMarks for this submission: 15.00/18.00.