Answers
Answer:
B. melting of ice caps
Explanation:
Related Questions
The molecules of a substance formed a rigid repeating crystal structure. Then, a phase change occurred. That structure is now more like clusters of molecules moving past one another. What phase change caused this change? Plz, explain your answer.
A
condensing
B
evaporating
C
freezing
D
melting
Answers
Answer: everybody report fNnasks he doesn't answer nobody question if you see it like you told me do it yourself science is super easy
Explanation:
How much heat energy is needed to raise the temperature of a 150g sample of water from 283 Kto 349 Kif water has a Cp value of 4.18 J/g*K.
Answers
so you would set it up like:
q=150 • 4.18 • (349-283)
Balance the Equation
Fe
+
HF
FeFz
+ H2
Answers
When nutrients, water, and materials cross a cell membrane without requiring energy from the cell, the process is called
A: Active Transport
B: homeostasis
C: Selective Permeability
D: Diffusion
Answers
passive transport.
Explanation
the movement of substances across a cell membrane without the use of energy by the cell.
Conservation of matter means that:
55
Matter is never created nor destroyed.
Matter is always created and destroyed.
Matter always turns into energy
Matter is flexible, it can be created destroyed, or turned into energy
Answers
Answer:
Matter is never created or destroyed
2H2 + O2 → 2H2O
"PLEASE HELP ASAP"
Which of the following statements would be correct if one mole of hydrogen was used in this reaction? (5 points)
One mole of oxygen was used in this reaction.
Two moles of oxygen were used in this reaction.
One mole of water was produced from this reaction.
Two moles of water were produced from this reaction.
Answers
Answer:
- One mole of oxygen was used in this reaction.
- Two moles of water were produced from this reaction.
Explanation:
In addition: - Two moles of hydrogen were used.
Given the data from the question, the correct statement is:
One mole of water, H₂O was produced from the reaction Basic conceptTo know which options are correct, we shall determine the number of mole of O₂ used and the number of mole of H₂O produced.
How to determine the mole of O₂ usedBalanced equation
2H₂ + O₂ —> 2H₂O
From the balanced equation above,
2 moles of H₂ required 1 mole of O₂
Therefore,
1 mole of H₂ will require = 1 / 2 = 0.5 mole of O₂
Thus, 0.5 mole of O₂ is needed for the reaction
How to determine the mole of H₂O producedFrom the balanced equation above,
2 moles of H₂ reacted to produce 2 moles of H₂O
Therefore,
1 mole of H₂ will also react to to produce 1 mole of H₂O
Thus, 1 mole of H₂O was produced from the reaction.
SUMMARY
When 1 mole of H₂ was used in the reaction,
0.5 mole of O₂ was used 1 mole of H₂O was producedConsidering the options given in the question above, the correct statement is:
1 mole of H₂O was producedLearn more about stoichiometry:
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|
Describe an important
water resource problem or
problems that can be
addressed using your
research topic.
Answers
Answer:There are following reasons:
About 50% fresh water goes waste due to runoff.
More than 1 billion people lack clean drinking water globally.
Population increase is much faster than the increase in the amount of available fresh water.
Per capita availability of fresh water will further decrease in the coming years.
Explanation: PLZ mark Brainlist
Hi, am I hot??
Please tell me I’m hot.
Answers
Answer:
you hot A S F
Explanation:
Given a gas with an initial volume of 3.0 L and a temperature of 290 K, what is the final volume if the
temperature is 273 K?
Plzzz neeed this really quick
Answers
Answer:
2.8l
Explanation:
just make v2 de subject
PLZ HELP! IN YOUR OWN WORDS! :D
How does changing frequency and wavelength affect how you hear sound?
Answers
Answer:
wavelength is inversely proportional to frequency.
frequency determines pitch of sound.
we hear sound differently.
when the wavelength or distance is short we Hear high sound .
when the wavelength or distance is high we Hear low sound .
plz help me get it right no links
Answers
Answer:
D
Explanation:
earth orbits the sun. the sun doesn’t orbit around earth. and moon take 27 days around the earth
adding sugar to your tea physical or chemical change
Answers
Answer:
physical
Explanation:
no chemical reaction occurs
Answer:
the answer is physical change :)
We can preserve natural resources by
А
drilling for as much oil as possible for just 10 years
B
using mostly trees for energy
с
relying on renewable energy sources
D
burning more fossil fuels
Answers
Answer:
drilling for as much oil as possible for just 10 yearsExplanation:
which one of the following are not steps of a balanced equation?
Answers
Answer:
Dealing with the states of both the reactant and product elements
Carbon, C has 6 valence electrons. H has 1 valence electrons so in total how much does carbons and hydrogen have together?
Answers
Explanation:
but carbon has four Valence Electrons
How heavy is 5 moles of silver in grams?
Answers
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Silver, or 107.8682 grams.
Explanation:
I took a test about this :)
help please!!!!
Which of the following models BEST represents how the nucleus of an atom changes as a result of nuclear fusion?
Answers
Answer:
C is the answer
Among the following, model D best represents how the nucleus of an atom changes as a result of nuclear fusion.
What is an atom?
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.
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What is the water vapor density maximum at 30 ᵒC? *
1.5 mol/1000 L
1.7 mol/1000 L
30 mol/1000 L
2.3 mol/1000 L
Answers
2.3 mol/1000L
Explanation:
relative humidity (rh)is the ratio of the partial pressure of water at a given temprature
hey guys you should all call this number and leave a funny voicemail
5082036290
heheh
GO CRAZY
Answers
Answer:
Who's number is it LOL
Explanation:
Answer:
okay
Explanation:
Molecules are always in motion. True False
Answers
Answer: FALSE
Explanation:
Collin uses balloons to investigate static electricity. Which of the following BEST
explains what will happen when he brings one negatively charged balloon next to a
positively charged balloon?
Answers
Answer:
The positive and negative electrons (or protons, don't really know) are opposites, so they attract each other, giving a whole new meaning to "Opposites attract."
Explanation:
According to his prelaboratory theoretical yield calculations, a student's experiment should have produced 1.44g of magnesium oxide. When he weighed his product only 1.23g of magnesium oxide was present. What is the student percent yield?
Answers
Explanation: 50%
The percent yield of the product formed in the experiment is 85.41%.
What is percent yield?Percent yield is defined as the ratio of actual yield to the theoretical yield multiplied by 100. If the actual and theoretical yield are same then the percent yield is 100%.If actual yield is less than the theoretical yield then the percent yield is less than 100%.Reason of this condition arising is the incompletion of reaction or loss of sample during recovery process.
In cases where percent yield is over 100% it indicates that more sample is recovered than the predicted amount.This condition arises when there are other simultaneous reactions taking place leading to the formation of product. It can also arise if there is incomplete removal of impurities from the sample .
In the given example, actual yield=1.23 g and theoretical yield=1.44 g
Thus on substituting values in the given formula, 1.23/1.44×100=85.41 %.
Thus , the percent yield of sample is 85.41%.
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16. Which list shows units of a single organ system, in order from the smallest unit to the
largest unit of organization.
(2 points)
1. red blood cell, nervous system, skin, stomach
2. circulatory system, heart, cardiac muscle, muscle cell
3.hepatic cell, liver tissue, liver, digestive system
Answers
The list that correctly shows units of a single organ system, in order from the smallest unit to the largest unit of organization is as follows: hepatic cell, liver tissue, liver, digestive system.
What is level of organization?The level of organization of life shows the hierarchical arrangement of the components that make up life.
The levels of organization are as follows:
Cell - simplest unit of lifeTissue - group of cells that work together to perform similar functionOrgan - group of tissues Organ system - group of organs that work togetherTherefore, the list that correctly shows units of a single organ system, in order from the smallest unit to the largest unit of organization is as follows:
hepatic cell, liver tissue, liver, digestive system
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Which of the following prefixes would show up in the name for SF6? Hexa, penta, tetra, hepta, and mono
Answers
Answer:
Sulfur hexafluoride
Explanation:
When hydrogen gas reacts with oxygen gas to make water, why is oxygen reduced?
Answers
Hamburger
Explanation: I ate a hamburger yesterday and methane came out my butt
Select ALL the compounds that would be classified as an acid:
HCI
H20
HC2H302
NaCl
KOH
Mg(OH)2
Answers
Answer:
option A,B,C
Explanation:
HCl
H2O
HC2H3O2
In the list given , following substance are classified as Acid:
HCl , HC₂H₃O₂ .
What is an Acid ?
A substance that can donate a proton or accept an electron pair to form a bond is called an Acid.
An acid turns Litmus paper red and has pH < 7 , It has the property of neutralizing alkali.
It has sour taste and can dissolve metals.
HCl is a strong acid , H₂O is neutral , HC₂H₃O₂ (Acetic acid) is a weak acid , NaCl is Salt , KOH and Mg(OH)₂ are strong base.
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What type of mirror could have resulted in the image of the giraffe above?
Answers
Answer:
A convex mirror
Explanation:
Good luck on the test m8!
A convex mirror could have resulted in the image of the giraffe above. A mirror is a surface which reflects almost all types of light that strike it
What is mirror?A mirror is a surface which reflects almost all types of light that strike it, according to physics. Furthermore, unless or until an opaque item is placed between both the reflecting surface as well as the source of light, a mirror will continue to reflect light in a regular manner.
In actuality, the reflection principle underlies how mirrors function. As far as we are aware, light is either reflected or absorbed. Whenever a mirror is present, light is reflected. Because a mirror has a flat surface just at microscopic level, light is reflected when it strikes one. A convex mirror could have resulted in the image of the giraffe above.
Therefore, a convex mirror could have resulted in the image of the giraffe above.
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At which volume of base added was all the acid neutralized?
Answers
Answer: The answer is A
im 86% sure
Answer: 40mL
Explanation: it has a pH of 7. Seven defines the most neutral value on the pH scale.
What is a cell? Please help
Answers
Explanation:
A cell is the membrane unit that contains all the fundamental molecules to living life. To make it short nd easy, a cell is the smallest nd basic unit of life, it's responsible for all life's processes. The human body is comped of m(tr)illions of cells, they all each provide different types of functions.
Phosphorus-33 has a half-life of 25 days. What fraction of the original sample would remain after 300 days?
Answers
Answer:
The correct answer is - 1/4096.
Explanation:
In the starting, there is that the number of atoms is N 0 .
The number of half-lives in this case, = 300/ 25 = 12
After the first half-lives or 25 days, N 1 = N 0 /2
the half life is that time where half of the sample had decay.
After the second half-life or 50 days, N 2 = N 1 /2 = N 0 /4 .
There is division by two the original amount, then after four times you divide four times for 2 that means that you divide by 2 ^12 =4096 .
So the final amount remain is N 12 = N 0 /4096 or 1/4096.