Answer:
Average Atomic Mass= 63.5 amu
Explanation:
Average Atomic Mass Equation:
(Mass 1)(% Abundance) +(Mass 2)(% Abundance)
Plug in Variables:
Make sure to convert the percentages into decimals. (Left two places)
Use the order of operations when solving.
(62.9)(0.692) + (64.9)(0.308) = AAM
Multiply each side
43.5268 + 19.9892 = AAM
Add the products together
63.516 = AAM
Add proper unit and satisfy the 3 significant figures needed
63.5 amu
who knows this........
Answer:
D
Explanation:
This creates a gap that we call an oceanic trench
:)
Arrange elements in decreasing order of the number of valence electrons
Answer:
It’s voice and a
Explanation:
If you are required to use 25.00 mL of 0.200 M NaOH for a titration reaction, how many moles of NaOH will you use?
Answer:
0.20 moles is used
Explanation:
molarity =given wt / gm mw ×1000/v(ml)
Susan and her friend found a piece of metal which they want to
identify.Here is what they figure out so far:
Mass of this metal is 74 g
Volume of this metal is 40 cm3
Answer:
The given metal is beryllium.
Explanation:
Given data:
Mass of metal = 74 g
Volume of metal = 40 cm³
Which metal is this = ?
Solution:
First of all we will calculate the density.
it is mass divided by volume.
d = m/v
d = 74 g/40 cm³
d = 1.85 g/cm³
In literature it is given that the density of beryllium is 1.85 g/cm³. Thus given metal is beryllium.
Explore: Natural gas is a mixture of methane (CH4), ethane (C2H6), and other gases. Find two ways that natural gas forms. List the steps of the two carbon pathways below:
Answer:
1. Atmosphere ⇒ Ocean ⇒ Marine Plants ⇒ Sediments ⇒ Natural Gas .
2. Atmosphere ⇒ Land Plants ⇒ Natural Gas.
Explanation:
Hello,
In this case, it is widely known there are two ways in which natural gas is formed:
1. Atmosphere ⇒ Ocean ⇒ Marine Plants ⇒ Sediments ⇒ Natural Gas .
In this one, the carbon dioxide in the atmosphere, is able to get through the ocean and in touch with marine plants which have the capacity to undergo photosynthesis and yield sugars which are subsequently fixated in the soil as sediments containing fossil fuels, coal and/or natural gas.
2. Atmosphere ⇒ Land Plants ⇒ Natural Gas.
In this one, the carbon dioxido also in the atmosphere is captured by the land plants which use it to undergo photosynthesis and subsequently fix it into the underground as fossil fuels, coal and/or natural gas as well.
Best regards.
Natural gas occurs naturally in the atmosphere and includes various forms of gases. Natural gases are formed from the atmosphere through the ocean or land.
What is the carbon cycle?The carbon cycle is the pathway of the formation and its flow in the different spheres of the planet.
The first pathway of the natural gas formation is explained as:
The natural gas or the carbon dioxide from the air or the atmosphere moves towards the ocean and marine plants that use them in the photosynthesis that laters get fixed as sediments in the ocean beds.
The second pathway of the natural gas formation is explained as:
The carbon dioxide from the air moves towards the land and is captured by the plants to use as reactants in process of photosynthesis. The carbon captured by the plant is fixed as fossils in the underground soil.
Therefore, natural gas can be formed by land and oceanic plants.
Learn more about natural gas here:
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7. What are the correct coefficients in order for the equation to be balanced?
Explanation:
I hope you benefit
this is the correct coefficient...
The recommended single dose for acetaminophen is 10.0 to 15.0 mg/kilograms of body weight for adults. Using this guideline calculate the maximum single dosage for a person who weighs 197 pounds
163 lb * 1 kg / 2.205 lb * 15.0 mg/kg = 1108.8 mg or about 1.11 g
What is the charge on an electron?
-1
0
+1
+2
Answer:
-1
Explanation:
Proton +1
Neutron 0
Electron −1
Which process uses the sun's energy to convert water on Earth's surface into water vapor?
Condensation
Evaporation
Precipitation
Transpiration
Answer:
Evaporation
Explanation:
Feel free to give brainliest.
Have an amazing day!
According to the rate law, how do concentrations affect rate?
A. The rate increases as concentrations decrease.
B. The rate increases as concentrations increase.
C. It is impossible to tell how the rate is affected.
D. The rate is independent of concentrations.
Answer:
Rate Laws. Typically, reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. Reaction rates generally increase when reactant concentrations are increased.
Vitamin A has the molecular
formula C20H300. How many
carbon atoms are in
6.02 x 1023 molecules vit A?
Answer: 307.923
Explanation: Im not sure but thats my best guess. :p
the re-closing of Purine ring in step 11 doesn't consume ATP. Why?
My Answer:
Because the closing of the Purine ring is used to conserve energy all throughout. Purine biosynthesis is a process used to destroy and break down waste without wasting as much energy as some other biological processes.
[tex]Hope\\ this\\ helps![/tex]
The energy produced by the sun and stars comes from ________.
mechanical energy
nuclear fission
nuclear fusion
i'll mark brainliest
Answer:
nuclear fission
Explanation:
Fission is the act of energy cells splitting give brainliest please
What is the molar mass of NaOH?
Answer:
39.99g/mol
Explanation:
Na = 22
O= 16
H = 1
= 40g or 39.99g/mol
Answer: 39.99g/mol
Explanation:
right
how many hydrogen atoms would be present in 12 molecules of water( H2o)?
3
2
24
12
Answer:
Don't know if the answer is correct or not.
There will be 24 atoms of hydrogen
Explanation:
for H2O there is 2 atoms
Therefore:
12×2=24
its is possible for a molecule to have a polar bond but have an overall polarity of nonpolar?
By definition
Definition of electronegativityThe electronegativity of an element is defined as the relative ability of an atom to attract electrons from another atom to chemically bond and form a compound.
In other words, electronegativity is a measure of the attractive force that one atom exerts on the electrons of another when a chemical bond forms.
Polarity of a bondThe polarity of a chemical bond occurs when there is an asymmetric distribution of the electron cloud of the bond around the two atoms that form said bond. This happens when both atoms have different electronegativity.
This is, the polarity of a bond is determined by the difference in electronegativity between the atoms that form it.
If the atoms forming the bond have very similar electronegativities, the bond is nonpolar.
On the contrary, if the difference in electronegativity is appreciable, the bond is polar and the electrons are not shared in a balanced way, creating electric dipoles.
Polarity of a moleculeThere are molecules whose bonds are polar and yet the molecules are nonpolar due to their geometry. This causes the dipole moments of the individual bonds to be canceled and, globally, the molecule will be apolar.
That is, the different dipole moments cancel each other out.
AnswerIn summary, its is possible for a molecule to have a polar bond but have an overall polarity of nonpolar.
Learn more about polarity:
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Which element requieres the least amount of energy to remove the outermost electron
Answer: Sodium
Explanation: The sodium has only one electron at the outer layer.
Hope this helps! :)
Question 22
When 85 g of CH4 are mixed with 320 g of O2 the limiting reactant is
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
Answer:
O2, oxygen.
Explanation:
Hello.
In this case, for the undergoing chemical reaction, we need to compute the moles of CO2 yielded by 85 g of CH4 (molar mass = 16 g/mol) and by 320 g of O2 (molar mass 32 g/mol) via the following mole-mass relationships:
[tex]n_{CO_2}^{by\ CH_4}=85gCH_4*\frac{1molCH_4}{16gCH_4} *\frac{1molCO_2}{1molCH_4} =5.3molCO_2\\\\n_{CO_2}^{by\ O_2}=320gO_2*\frac{1molO_2}{32gO_2} *\frac{1molCO_2}{2molO_2} =5molCO_2[/tex]
Considering the 1:2:1 among CH4, O2 and CO2. Therefore, since 320 g of O2 yield the smallest amount of CO2 we infer that the limiting reactant is O2.
Best regards.
50 POINTS
When the temperature of air increases, how does the pressure change?
Assume there is no change in air volume.
1. The pressure decreases
2. The pressure remains the same
3. The pressure increases
Answer:
the pressure in The air increase
Help I need to show work!
Question: The result of a reaction of propane and air gave 11.21 g CO2 and 33.0 grams water according
to the following equation: C3H3 + 5 02 + 3 CO2 + 4 H20
a) What type of reaction (name reaction) is this?
b. How many grams of carbon were produced?
C. How many grams of hydrogen were produced?
Answer:
a. Combustion.
b. [tex]m_C=3.057gC[/tex]
c. [tex]m_H=3.67gH[/tex]
Explanation:
Hello.
a. In this case, given the reaction by which propane is converted into carbon dioxide and water:
[tex]C_3H_8+5O_2 \rightarrow 3CO_2+4H_2O[/tex]
It is known as a combustion reaction since it is about a fuel (here propane) which is burnt by the oxygen contained in the air (21%).
b. Since the carbon dioxide contains all the carbon in the products based on the law of conservation of mass, the yielded grams are computed via a mole mass relationship:
[tex]m_C=11.21gCO_2*\frac{12gC}{44gCO_2}=3.057gC[/tex]
Since 44 grams of carbon dioxide contain 12 grams of carbon.
c. As well as b., all the hydrogen is given off in form of water, thus, the required mass turns out:
[tex]m_H=33.0gH_2O*\frac{2gH}{18gH_2O}=3.67gH[/tex]
Since 18 grams of water contain 2 grams of hydrogen.
Best regards.
A compound contains only Fe and O. A 0.2729 g sample of the compound was dissolved in 50 mL of concentrated acid solution, reducing all the iron to Fe2+ ions. The resulting solution was diluted to 100 mL and then titrated with a 0.01621 M KMnO4 solution. The unbalanced chemical equation for reaction between Fe2+ and MnO−4 is given below.
MnO−4(aq)+Fe2+(aq)→ Mn2+(aq)+Fe3+(aq) (not balanced)
The titration required 42.17 mL of the KMnO4 solution to reach the pink endpoint.What is the empirical fomula of the compound?
Answer:
FeO
Explanation:
The balanced reaction equation is
MnO−4(aq)+5Fe2+(aq)→ Mn2+(aq)+5Fe3+(aq)
Number of moles of KMnO4 reacted = 0.01621 M × 42.17/1000 = 6.84 × 10^-4 moles
Since
1 mole of MnO4^- reacted with 5 moles of Fe^2+
6.84 × 10^-4 moles of MnO4 will react with 6.84 × 10^-4 moles × 5 = 34.2 × 10^-4 moles of Fe^2+
Mass of Fe^2+ reacted = 34.2 × 10^-4 moles of Fe^2+ × 56gmol-1 = 0.192 g of Fe
Hence % of iron in the sample = 0.192/0.2729 × 100 = 70.4%
% of oxygen = (0.2729 -0.192)/0.2729 × 100 = 29.6%
Empirical formula of the compound is obtained by
70.4/56, 29.6/16
1.257, 1.85
Divide through by the lowest ratio
1.257/1.257, 1.85/1.257
1, 1
Hence the empirical formula is FeO
Ateacher wants to figure out the amount of a solution that is needed for a litration experiment in a class lab. The dass
has 15 students, and each experiment needs 50 ml. of solution
If each student will perform the experiment two times, how many ml of solution will the teacher need for the whole
class?
O 375 ml
750 ml
1500 ml
3000 ml
Answer:
750 ml
Explanation:
Given parameters:
Number of students in the class = 15
Volume of solution needed per student = 50ml
Unknown:
Volume of solution needed for the whole class = ?
Solution:
The total volume needed for the class;
= number of students x volume of solution per student
= 15 x 50
= 750ml
The volume of solution needed by the teacher for the whole class is 750mL
Select the Multiple Atoms tab. Select the Continuous option from the Electron Production control and also select the Spectrometer and Squiggles options. Now select hydrogen, run the experiment, and note the colors and wavelengths of the photons shown in the spectrometer readings. Do the same with neon. How would you differentiate hydrogen and neon using the spectrometer readings?
Answer:
hydrogen and neon can be distinguished based on their atomic spectra, neon has wavelengths in the range of 540 nm to 750 nm and the colors of light are observed as green, yellow, orange, and red.
hydrogens wavelengths are in the range of 410 nm to 660 nm. the colors obeserved are purple, dark blue, light blue, and red.
so they can be differentiated by their wavelengths and the colors of light they emit.
1. What is contained in the nucleus of an atom?
Answer:
The atom consists of a tiny nucleus surrounded by moving electrons. The nucleus contains protons, which have a positive charge equal in magnitude to the electron's negative charge. The nucleus may also contain neutrons, which have virtually the same mass but no charge.
Please mark as brainliest;)
Which of the following is in correct order in terms of increasing intermolecular forces?
Answer:
C
Explanation:
I PROMISE you its right :D
what is chemical bond
Answer:
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds.
Explanation:
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.
Which step in a comparative is not included in a descriptive investigation?
Answer:
the answer is a A
Explanation:
Answer:
Compare
Explanation:
What do you think would happen to the Earth’s energy balance if the concentration of greenhouse gases increase
Answer:
rise to an imbalance in Earth's energy budget
Explanation:
Increased atmospheric greenhouse gas concentrations give rise to an imbalance in Earth's energy budget by initially reducing the amount of emitted thermal infra-red radiation. The result of this imbalance is an accumulation of excess energy in the Earth system over time.
Answer:
Increased atmospheric greenhouse gas concentrations give rise to an imbalance in Earth's energy budget by initially reducing the amount of emitted thermal infra-red radiation. The result of this imbalance is an accumulation of excess energy in the Earth system over time.
Explanation:
hope it helps you
Baking soda NaHCO3, is made from soda ash, a common name for sodium carbonate. The soda ash is obtained in two ways. It can be manufactured in a process in which carbon dioxide, ammonia, sodium chloride, and water are the starting materials. Alternatively, it is mined as a mineral called trona (top photo). Whether the soda ash is mined or manufactured, it is dissolved in water and carbon dioxide is bubbled through the solution. Sodium bicarbonate precipitates from the solution. As a chemical analyst you are presented with two samples of sodium bicarbonateâone from the manufacturing process and the other derived from trona. You are asked to determine which is purer and are told that the impurity is sodium carbonate. You decide to treat the samples with just sufficient hydrochloric acid to convert all the sodium carbonate and bicarbonate to sodium chloride, carbon dioxide, and water. You then precipitate silver chloride in the reaction of sodium chloride with silver nitrate. A 6.93 g sample of baking soda derived from trona gave 11.89 g of silver chloride. A6.78 g sample from manufactured sodium carbonate gave 11.77 g of silver chloride.
Required:
Which sample is purer, that is, which has the greater mass percent NaHCO3?
Answer:
Explanation:
From the given information:
mass of silver chloride AgCl = 11.89 g
molar mass of AgCl = 143.37 g/mol
We know that:
number of moles = mass/molar mass
∴
number of moles of AgCl = 11.89 g/ 143.37 g/mol
number of moles of AgCl = 0.0829 mol
The chemical equation for the mineral called trona is:
[tex]\mathsf{Na_2CO_3.NaHCO_3.2H_2O}[/tex]
when being reacted with hydrochloric acid, we have:
[tex]\mathsf{Na_2CO_3.NaHCO_3.2H_2O + 3HCl \to 3NaCl + 2CO_2 +4H_2O}[/tex]
One mole of NaCl formed from one mole of trona sample = 0.0829 moles of AgCl
i.e. 0.0829 moles of NaCl can be formed from AgCl
mass of trona sample = number of moles × molar mass
mass of trona sample = 0.0829 × 226
mass of trona sample = 18.735 g
The mass in the percentage of NaHCO₃ = mass of NaHCO₃/ mass of trona
The mass in the percentage of NaHCO₃ = 6.93/18.735
The mass in the percentage of NaHCO₃ = 0.36989
The mass in the percentage of NaHCO₃ = 36.99%
Nonetheless, a 6.78 g samples manufactured from sodium carbonate in pure 100%
∴
6.78 g sample manufactured from Na₂CO₃ is purer.
HELP ASAP
Which of these correctly lists the order of the engineering process?
A. Produce a product, improve it, identify a problem, make a solution,
test the solution.
B. Make a solution, identify a problem, research the problem, test the
solution, improve the product, test and evaluate, research, make a
plan, do the plan.
C. Identify a need, research the background, make a plan, do the
work, evaluate the results, look for improvements.
Answer:
C. Identify a need, research the background, make a plan, do the
work, evaluate the results, look for improvements.
Answer:
B.make a solution, identify a problem, research the problem, test the solution, improve the product, test and evaluation, research, make a plan , do the plan
Explanation:
B