Answers
Related Questions
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
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.
Which gas is emitted through the burning of fossil fuels?
O) carbon dioxide
O) nitrous oxide
O) chlorofluorocarbons
O) oxygen
Answers
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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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:
what is the name of the energy needed to change the structure of matter
Answers
Answer:
Heat fusion
Explanation:
The energy required to change a solid to a liquid is called the heat of fusion.
Hi, am I hot??
Please tell me I’m hot.
Answers
Answer:
you hot A S F
Explanation:
Which is the coefficient in this compound?
4CO2
Answers
Answer:
the answer is
Explanation:
number of mollecoles
In chemistry a coefficient denotes the number that is seen in front of the formula of a equation. The coefficient in the given equation 4CO₂ is 4.
What is a coefficient?A number which precedes the formulas of reactants and products in order to balance a chemical equation is defined as a coefficient. It represents the number of atoms or molecules of each elements which are present in the reaction.
A chemical equation should be balanced and it must obey the law of conservation of mass which states that the number of reactants and products on both sides of the equation should be equal.
The coefficients are the numbers which are required to balance a chemical equation and it may vary while balancing a equation. The coefficient is found to be 1 if no number is mentioned in front of the formula of the reactants and products.
In the given equation 4CO₂, 4 is the coefficient which shows that 4 'C' atoms and 8 'O' atoms are present in the compound CO₂.
Thus the coefficient in the compound 4CO₂ is 4.
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how mutch heat do you use to evaporerate warter
Answers
Answer:
Water's heat of vaporization is around 540 cal/g at 100 °C. The same amount of heat is exchanged or released in the phase shift during the condensation of 1 g water vapor to 1 g of water.
Explanation:
brainliest?
waters boiling point is 212F or 100C
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:
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
HELP ME PLSSS:(((
Question 8 of 10
What is area?
A. The substance of an object
B. A unit of measurement
C. The size of an angle
D. How much space a flat shape covers
SUBMIT
Answers
Answer:
D
Explanation:
The area of a shape is the amount of space a 2-dimensional shape covers. It's measured in units squared (units²). So, the answer is D.
|
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
Ecosystem diversity, species diversity, genetic diversity all intertwine to create ____________.
A. Vulnerability
B. Biodiversity
C. Interdependence
D. Recycling
“Science”
Answers
Answer:
B
Explanation:
Biodiversity matches up with the themes of 'ecosystem diversity, species diversity, genetic diversity'
hope this helps
Balance the Equation
Fe
+
HF
FeFz
+ H2
Answers
Water evaporates from oceans, lakes, streams, plants and even soil.
TRUE or FALSE
Answers
Answer:
True
Explanation:
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 :)
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)
HELP THIS IS DUE SOON AND I HAVE MORE WORK TO DO
Answers
Answer:
A
Explanation:
Most of the world's active volcanoes are located along or near the boundaries between shifting plates and are called "plate-boundary" volcanoes.
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
What is the molar mass of lead nitrate (Pb(NO3)2) from the equation below?
2Pb(NO3)2(s) -> 2PbO(s) + 4NO2(g) + O2(g)
A.
269 g
B.
331 g
C.
662 g
D.
283 g
Answers
Answer:
331.2 g/molExplanation:
The molar mass of lead nitrate (Pb(NO₃)₂) is 331 g. Therefore, option B is correct.
The atomic mass of lead (Pb) is 207.2 grams per mole.
The atomic mass of nitrogen (N) is 14.0 grams per mole.
The atomic mass of oxygen (O) is 16.0 grams per mole.
In lead nitrate, 2 nitrate ions (NO₃), so multiply the atomic mass of nitrogen by 2 and the atomic mass of oxygen by 6 (since there are 3 oxygen atoms in each nitrate ion):
2(N) + 6(O) = 2(14.0 g) + 6(16.0 g)
= 28.0 g + 96.0 g
= 124.0 g
Pb(NO₃)₂ = 207.2 + 2(14.01 + 3(16.00))
= 207.2 + 2(14.01 + 48.00)
= 207.2 + 2(14.01 + 48.00)
= 207.2 + 2(62.01)
= 207.2 + 124.02
= 331 g
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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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What is a cell? Please help
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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.
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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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
adding sugar to your tea physical or chemical change
Answers
Answer:
physical
Explanation:
no chemical reaction occurs
Answer:
the answer is physical change :)
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 .
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:
Which of the following prefixes would show up in the name for SF6? Hexa, penta, tetra, hepta, and mono
Answers
Answer:
Sulfur hexafluoride
Explanation:
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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