Answer:
Independent variable: different alcohols
Dependent variable: red dye
Analyze the chart below and then answer the follow question. In 2020, how does the percentage of the population with access to drinking water facilities in North America compare to that of the World?
Question options:
Compared to the average population around the World, North America has a 24% greater percentage of people with access to safely managed drinking water.
Compared to the average population around the World, North America has a 98% greater percentage of people with access to safely managed drinking water.
Compared to the average population around the World, North America has a 16% greater percentage of people with access to safely managed drinking water.
Compared to the average population around the World, North America has a 74% greater percentage of people with access to safely managed drinking water.
Answer:
Explanation:
In North America, 96% of people have safely managed drinking water, and the World on average has 74% of people with access to safely managed drinking water. 96-74=22% difference.
Analyze the relationship between viscosity, temperature, and change in kinetic energy by completing the table.
When temperature of fluid increases, kinetic energy increases, viscosity decreases and the fluid flows faster.
When temperature of a fluid decreases, kinetic energy decreases, viscosity increases and the fluid flows slower.
When temperature of a fluid stays the same, kinetic energy stays the same, viscosity stays the same and the fluid flow stays the same.
What is viscosity?Viscosity is the friction that exist between the internal layers of a fluid in motion.
Viscosity decreases with temperature due to the increase in the kinetic energy of the molecules of the fluid.
Based on the relationship between temperature, kinetic energy and viscosity:
when temperature increases, kinetic energy increases, viscosity decreases and the fluid flows faster. when temperature decreases, kinetic energy decreases, viscosity increases and the fluid flows slower. when temperature stays the same, kinetic energy stays the same, viscosity stays the same and the fluid flow stays the same.Therefore, it can be concluded that viscosity of a fluid depends on temperature.
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PLEASE HELP ASAP 20 POINTS!! As the pH of ocean water decreases, it becomes more _____.
Question 2 options:
acidic
basic
Answer:
acidic
Explanation:
9) The temperature at which a substance in the liquid state freezes is the same as the
temperature at which the substance-
a. Melts b. Sublimes
c. Boils
d. Condenses
Answer:
A
Explanation:
When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Therefore, the correct option is option A.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. The temperature at which a substance in the liquid state freezes is the same as the temperature at which the substance melts.
Therefore, the correct option is option A.
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State two difference between the physical properties of potassium and vanadium.
[tex]\huge \underline\frak \pink{Answer}[/tex]
[tex]\small\mathbb\red{physical \: properties \: of \: potassium}[/tex]
1) potassium are soft silvery white metal with a Boling point of 63°C (145°F) and a boling point are 770°C (1,420°F)
2) It's density is 0.862 grams per cubic centimeter less than that of water (1.00 grams per cubic centimetrer that potassium metal float in water
[tex]\small\mathbb\green{physical \: properties \: of \: vanadium}[/tex]
1) vanadium is a silvery white, ductile, metallic looking solid. they capable of the being drawn into a thin wires
2) It melting point Is about 1,900°C (3,500°F) and its boiling point is about 3,000°C (5,400°F). the density is 6.11 grams per cubic centimeter
[tex]\small\mathbb\orange{hope \: it's \: helpful \: to \: you}[/tex]
Consider the following reaction: Mg(s) + NiSO4(aq) → MgSO4(aq) + Ni(s). Write the half reactions for the oxidization and reduction taking place
The oxidation and reduction half reactions are
Mg(s) → Mg²⁺(aq) + 2e⁻
and
Ni²⁺(aq) + 2e⁻ → Ni(s)
respectively
Half reactionsFrom the question, we are to write the half reactions for the oxidation and reduction taking place
The given reaction is
Mg(s) + NiSO₄(aq) → MgSO₄(aq) + Ni(s)
To write the oxidation and reduction half reactions, first we will write the ionic equation for the reaction.
The ionic equation for the reaction is
Mg(s) + Ni²⁺(aq) → Mg²⁺(aq) + Ni(s)
Recall:
Oxidation is the loss of electron(s) while reduction is the gain of electron(s)
Therefore,
The oxidation half reaction is
Mg(s) → Mg²⁺(aq) + 2e⁻
and the reduction half reaction is
Ni²⁺(aq) + 2e⁻ → Ni(s)
Hence, the oxidation and reduction half reactions are
Mg(s) → Mg²⁺(aq) + 2e⁻
and
Ni²⁺(aq) + 2e⁻ → Ni(s)
respectively.
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A cup of water at 298 K (the system) is placed in a microwave oven and the oven is turned on for 1 minute during which it begins to boil. What is the sign of q and w
On this particular case, both heat and work are applied to the system, so both signs are positive.
Relation between work and heat?
We define Q as the heat, and W as the work, such that, by the first law of thermodynamics, we know that:
change in energy = Q + W.
In this case, we have a cup of water which is placed in a microwave oven, so this is a reservoir that gives heat to our system. Then Q is positive (because the heat is being applied to the system).
On the work side. If we do work on the system, the sign is positive. If the work is done by the system, the sign is negative
In this case, the work is applied to the system (as it rotates on the plate), thus the sign of the work is positive.
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More than half the total present volume of ocean water resides in what ocean?
The Pacific Ocean is the largest ocean in the world based on water volume, totaling some 660 million cubic kilometers and is almost equally divided into the North and South Pacific waters.
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1 CCS 8SCI SMA 3 L.5.1, 5.2 I 4 of 19
Which best describes how green plants use the glucose they produce in photosynthesis?
A. Green plants store the glucose they produce, and it becomes a food source for animals.
B. Green plants use the glucose they produce to prevent infection from bacteria and viruse:
C. Green plants use the glucose they produce to carry out life processes such as growth an
D. Green plants use the glucose they produce as a raw material to continue the process of
Which is not a reason humans need to stay hydrated
A. Removal of liquid waste
B. Main a steady temperature
C.Lubricate joints.
D.Provide vitamin C to the body
The one that is not a reason humans need to stay hydrated is to provide vitamin C to the body.
What is dehydration?Dehydration occurs when you do not drink enough fluid or lose more fluid than you take in.
Sweating, tears, vomiting, urine, or diarrhea all cause fluid loss. The severity of dehydration is affected by a variety of factors, including climate, level of physical activity, and diet.
Dehydration symptoms include dark urine, decreased urination, headaches, fatigue, dry skin, decreased skin turgor, and poor concentration. Drink plenty of water or other fluids every day to ensure you're getting enough fluids.
Milk, according to research, is one of the best beverages for hydration, even better than water or sports drinks. Milk's natural electrolytes, carbohydrates, and protein are credited with its effectiveness, according to researchers.
Proper water content will aid in removal of waste, maintaining temperature, lubrication, and many more.
Thus, the correct option is D.
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An unbalanced force results when the sum of all
forces is __ and causes the object to ___.
An unbalanced force results when the sum of all forces is unequal and causes the object to displace.
What is unbalanced force?Unbalanced forces occur when the force applied in one direction exceeds the force applied in the opposite direction.
When unbalanced forces act on an object, the speed and/or direction change.
When the forces acting on an object are out of balance, they do not cancel each other out.
When an unbalanced force acts on an object, the object's motion changes. The object's speed (whether increasing or decreasing) or direction may change.
Unbalanced forces are caused by a forward force (or thrust) and a frictional force opposing each other.
Friction is an opposing force to motion. It occurs whenever two surfaces rub against each other.
Thus, it is unequal force that results in movement of the object.
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Read each situation carefully. Write how energy transformation occurs in each situation. Write your answer on a separate sheet of paper.
1. Gerald just finish his work out at the gym. He ran at the park for 30 minutes and got very sweaty. What energy transformation took place while he was running?
2. Joshua was very hungry when he got home from the school. He decided to make some popcorn in the microwave. What energy transformation allowed Joshua's popcorn to pop?
3. Jeremy shaves every week using a battery powered shaver. What energy transformation shows how the shaver works?
4. Rica studies her lesson before going to bed at night. She makes use of a lampshade in studying her lessons. What energy transformation occurs when she plugged in the lamp shade and turned it on?
5. Dennis used to watch his favorite cartoon character every saturday using the smart television. What energy transformation occurs on the television?
[tex]tysm \: in \: advance[/tex]
Answer:
1. Mechanical energy
2. Thermal energy
3. electric energy to mechanical energy
4. electrical energy to light
5. electric energy into sound energy and radiant energy
Explanation:
50.00 mL of a solution containing 0.15 M CH2 (CO2 H)2 and 0.020 M MnSO4
1. Calculate the mass in g of malonic acid required.
Watch your sig figs! (enter just the number)
Answer:
[tex]m_{solute}=0.78gCH_2 (CO_2 H)_2[/tex]
Explanation:
Hello.
In this case, for the given volume and molarity of malonic acid (solute), we can compute the mass by first computing the moles considering the definition of molarity:
[tex]M=\frac{n_{solute}}{V_{solution}} \\\\n_{solute}=M*V_{solution}=0.15mol/L*50.00mL*\frac{1L}{1000mL}\\ \\n_{solute}=0.0075molCH_2 (CO_2 H)_2[/tex]
Then, since the molar mass of the malonic acid is 104.1 g/mol, we can compute the required mass in g of malonic acid for the preparation of that solution as shown below:
[tex]m_{solute}=0.0075molCH_2 (CO_2 H)_2*\frac{104.1gCH_2 (CO_2 H)_2}{1molCH_2 (CO_2 H)_2}\\ \\m_{solute}=0.78gCH_2 (CO_2 H)_2[/tex]
Notice that the shortest number is the molarity (0.15 M) with two significant figures, that is why the answer is displayed with two significant figures too.
Regards.
c) If a mixture of zinc powder and cobalt(II) oxide is heated, the following reaction occurs: Zn(s) + COO(s) → ZnO(s) + Co(s) (i) Which metal is higher in the reactivity series? (ii) The zinc can be described as a reducing agent. Using this example, explain what is meant by the term 'reducing agent'. (iii) Which substance in this reaction has been oxidised?
Answer:
The metal which reduces the other compound is the one higher in reactivity. So in this case, it is.
Explanation:
Almost all scientific work before Emperor
Chin was destroyed. Why?
Answer:The Qin Dynasty established the first empire in China, starting with efforts in 230 B.C., during which the Qin leaders engulfed six Zhou Dynasty states. The empire existed only briefly from 221 to 206 B.C., but the Qin Dynasty had a lasting cultural impact on the dynasties that followed.
Capital of Qin Dynasty
The Qin region was located in modern-day Shaanxi province, north of the Zhou Dynasty territory - Qin served as a barrier between it and the less civilized states above it. The capital of the Qin Dynasty was Xianyang, which was extensively enlarged after Qin dominance was established.
Qin itself had been considered a backwards, barbarian state by the ruling Zhou Dynasty. This distinction had to do with its slow pace in embracing Chinese culture, for instance, lagging behind the Zhou in doing away with human sacrifice.
The ruling class of Qin nonetheless believed themselves to be legitimate heirs to the Zhou states, and through the centuries they strengthened their diplomatic and political standing through a variety of means, including marriage.
Shang Yang
It was during the rule of Duke Xiao from 361 to 338 B.C. that the groundwork was laid for conquest, primarily through the work of Shang Yang, an administrator from the state of Wey who was appointed Chancellor.
Shang Yang was a vigorous reformer, systematically reworking the social order of Qin society, eventually creating a massive, complicated bureaucratic state and advocating for the unification of Chinese states.
Explanation:
Which part of the water cycle happens to most water after surface runoff?
O Collection
O Condensation
Evaporation
O Precipitation
Answer:
collection
Explanation:
Need help on worksheet
B. Match each term to its description or definition. (4 points)
-
A. Heat
B. Thermal energy
C. Conduction
D. Convection
E. Radiation
F. Specific heat
G. Enthalpy
H. Entropy
_____ Heat required to raise 1 g of a substance 1°C
_____ The transfer of thermal energy between objects
_____ A measure of the randomness in a system
_____ Heat transfer through direct contact between molecules
_____ Heat given off or absorbed in a reaction
_____ Heat transfer by way of electromagnetic waves
_____ Total kinetic energy of all molecules in a system
_____ Heat transfer through movement of liquids or gases
Molecules are always in constant random motion due to the possession of energy. The thermal energy is the total kinetic energy of all molecules in a system.
What is entropy?The term entropy refers to the degree of disorderliness in a system. We shall now match each term with its appropriate description.
Heat - The transfer of thermal energy between objectsThermal energy - Total kinetic energy of all molecules in a systemConduction - Heat transfer through direct contact between moleculesConvection - Heat transfer through movement of liquids or gasesRadiation - Heat transfer by way of electromagnetic wavesSpecific heat - Heat required to raise 1 g of a substance 1°CEnthalpy - Heat given off or absorbed in a reaction Entropy - A measure of the randomness in a systemLearn more about thermal energy:https://brainly.com/question/11278589
Sara wanted to perform a scientific experiment relating the effect of ultraviolet (UV) light on the survival rate of microscopic protists in pond water. She went to a local pond and collected a large bucket of pond water, then poured 500 milliliters of the pond water into each of two identical glass jars. She viewed a small sample of the pond water under a compound light microscope to verify that the water contained multiple species of microscopic protozoa. She was also able to get a rough count of the organisms in her sample using a special microscope slide. To set up her experiment Sara took one of the glass jars with pond water and protists, labeled it “100”, and placed it 10 centimeters under a lamp that transmits 100% UV light. The other jar, she labeled “O” and placed it 10 centimeters under a lamp that transmits 0% UV light. After the pond water/protist mixture in both jars was exposed to the lights for 8 hours, she collected samples from both jars. She used the same procedure as before and made a 2nd count of the microorganisms to compare to her first count.
12. If Sara were to graph her data using a bar graph, what should her axes be labeled?
The ionic compound strontium sulfide contains_______ atoms of strontium and________atoms of sulfur.
Answer:
what are the words? I don't see it
Question 7(Multiple Choice Worth 1 points)
[FW.02]Students should record information on groundwater only from sources which are
biased
O historic
reliable
secondary
Answer:
I think its reliable
Explanation:
Answer: The Answer is Up To Date
Explanation:
Assess the following statements about fractional distillation. Determine which are TRUE/FALSE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points.
b. The column efficiency of a fractionating column can be assessed by the HETP
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component
d. A fractionating column is part of the apparatus set-up
The assessments of the given statements on the nature of the fluids and
the fractional distillation processes are as follows;
a. TRUE
b. TRUE
c. FALSE
d. A fractionating column is a glass piece that contains metal pieces or glass beads
What are the correct points regarding fractional distillation?Option a.
Multiple vaporization-condensation cycles enhances the separation of
the components of the mixture;
Thereby enabling purification of the samples that have boiling points
that are close.
Option a is therefore; TRUE
a. Multiple vaporization-condensation cycles are needed to purify samples of relatively close boiling points. TRUEOption b.
The Height Equivalent to Theoretical Plate, HETP, indicates the
efficiency of the separation, and the fractionating column.
Therefore, option b. is TRUE
b. The column efficiency of a fractionating column can be assessed by HETP. TRUEOption c.
After every condensation-vaporization cycle, the condensate contains
more of the more volatile, component and the vapor be comes enriched
in the lower boiling point component.
Therefore, option c is FALSE
c. With every condensation-vaporization cycle, the vapors become enriched in the higher boiling point component. FALSEOption d.
d. The location of a fractionating column is placed vertically between the
mixture to be separated and the 'Y' adaptor, and consist of a straight
tube containing pieces of metals or glass beads.
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The time it takes for the insurance carrier to process a claim is called
time.
Convert 77kPa to mmHg.
Answer:
Explanation:
the conversion of 77 Killopascal to millimetre of mercury is
577.547 millimetre of mercury.
Technetium-104 has a half-life of 18.0 minutes. How much of a 165 g sample is left after 90.0 minutes?
Answer:
After 90 minutes 5.15625 g amount left from total of 165 g.
Explanation:
Given data:
Technetium-104 half life = 18.0 min
Total amount of sample = 165 g
Amount left after 90.0 min = ?
Solution:
First of all we will calculate the number of half lives passes.
Number of half lives = T elapsed / Half life
Number of half lives = 90 min /18.0 min
Number of half lives = 5
Amount left:
At time 0 = 165 g
At first half life = 165 g/ 2= 82.5 g
At 2nd half life = 82.5 g/2 = 41.2 g
At 3rd half life = 41.2 g/ 2 = 20.625 g
At 4th half life = 20.625 g/ 2 = 10.3125 g
At 5th half life = 10.3125 g /2 = 5.15625 g
Thus, after 90 minutes 5.15625 g amount left from total of 165 g.
How are new elements made and named?
Answer:
Science textbooks around the world have become suddenly out of date. Four new chemical elements have been added to the periodic table. A big decision now lies ahead - elements 113, 115, 117 and 118 need to be given their official names and symbols.
New elements can be named after a mythological concept, a mineral, a place or country, a property or a scientist. The names have to be unique and maintain "historical and chemical consistency" . This means a lot of "-iums".
"They're Latinising the name," explains chemist Andrea Sella of University College London. "The most recent tradition has been to name them after places or after people." The places chosen tend to be where the element was discovered or first manufactured. The Swedish village of Ytterby has managed to get four named after it (ytterbium, yttrium, erbium and terbium).
No-one has yet named an element after themselves but many elements are named in tribute to important scientists. Albert Einstein was given einsteinium. This can also be a way of righting the wrongs of the past. "Lise Meitner was really the chemist who spotted nuclear fission but she was never really recognised for it because she was Jewish and a woman," says Sella. "To be able to give an element a name that reminds us of her is I think greatly important."
The naming process isn't quick. The scientists who discovered them will start things off by proposing a name. But it will be down to the International Union of Pure and Applied Chemistry (IUPAC) to approve it. A special division of the US-based group has to accept the proposal. There is then a public review period of five months before the IUPAC council gets the final approval. Once it's ready, the name is announced in the scientific journal Pure and Applied Chemistry .
Scientists sometimes get creative. Mythical names have proved popular. Promethium was named after a character from a Greek legend who stole fire from the gods to give to humans and was punished by being chained to rock so an eagle could feed on his liver. The name was meant to reflect the fact that synthesising new elements often requires sacrifice.
There is hidden meaning in the table - as in the naming of praseodymium and neodymium. They replaced didymium - wrongly thought to be an element but in fact a mixture of the two. "The reason I like them is because they're called the green twin and the new twin," says Sella. "Didymium was named after [the Greek for] twin but in fact it also means testicles."
Naming an element is not just about functionality. "There's a tremendous romance to this," he adds. "Names are always important."
pa help pa help pa help
What is the example of erosión happening around your neighborhood or local area?
Answer:
When it rains in my backyard, the rain carries the soil to the edge of my backyard near the fence and creates a huge mud puddle.
Explanation:
What type of waves come out of the radio tower? Electromagnetic or Sound?
Answer:
Electromagnetic
Explanation:
Hope this helps
Fill in the coefficients that will balance the following reaction: fill blanks
___C8H18 + ___02->___ CO2+ ___H20
Answer:
2C⁸H¹⁸+ 25O² => 16CO² + 18H²O
It can also be written as;
C⁸H¹⁸ + 25/2 O² => 8CO² + 9H²O
What is the molarity of a solution made by dissolving 65.0 g of NaNO3 in enough water to make 0.350 L of solution?
First we need the molar mass of NaNO_3:-
[tex]\\ \sf\longmapsto 23+14+3(16)[/tex]
[tex]\\ \sf\longmapsto 37+48[/tex]
[tex]\\ \sf\longmapsto 85g/mol[/tex]
Now we need moles of NaNO_3
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{Given\:mass}{Molar\:mass}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=\dfrac{65}{85}[/tex]
[tex]\\ \sf\longmapsto No\:of\:moles=0.765mol[/tex]
Now
[tex]\\ \sf\longmapsto Molarity=\dfrac{Moles\:of\:solute}{Vol\:of\:soln.\:in\:L}[/tex]
[tex]\\ \sf\longmapsto Molarity=\dfrac{0.765}{0.350}[/tex]
[tex]\\ \sf\longmapsto Molarity=2.2M[/tex]