CHEMISTRY MIDDLE SCHOOL

Easy Questions! Chemistry - Please help! I give thanks
Easy Questions! Chemistry - Please help! I give thanks - 1

Answers

Answer 1
Answer: this is not chemistry but

see it is a triangular prim on it's side
V=BH
are of base times height
the base is a triangle
height is 18.5

base=1/2bh
b=8.6
h=8.4
base=1/2(8.6)(8.4)
base=36.12

V=bh
V=36.12*18.5
V=668.22

round
V=668.2 ft^3
Answer 2
Answer: all sides have to be exact

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Which of the following best describes a fission reaction involving lithium? (1 point)A. Two lithium atoms form bonds with each other, absorbing a large amount of energy. B. The nuclei of lithium atoms join together to form heavier isotopes, and energy is released. C. An atom of lithium absorbs electrons, undergoes an increase in energy level, and splits into fragments. D. The nucleus of an atom of lithium splits, resulting in smaller fragments and the release of a large amount of energy. Nuclear power plants produce a great amount of energy using fission reactors. However, there are safety risks. Which of the following risks are related to using nuclear power plants? (1 point) A. storage and disposal of radioactive waste B. production of radioactive atmospheric pollutants C. improper handling of volatile radioactive chemicals D. lack of adequate space to carry out reactions involving radioactive materials Which of the following natural resources does not contribute to global warming or air pollution? (1 point) A.coal B.natural gas C.nuclear power D.oil Which of the following statements about natural resources is correct? (1 point) A. Oil is more difficult to remove from the Earth than coal. B. Coal is present in small quantities compared to other fossil fuels. C. Natural gas has a limited supply and an uneven worldwide distribution. D. Nuclear power produces small amounts of energy from extremely large masses of fuel. Which of the following natural resources is considered non-renewable? (1 point) A. biofuel B. geothermal power C. nuclear power D. solar power Heat energy beneath the Earth's surface heats underground water into steam to operate steam turbines. This describes which of the following resources? (1 point) A. biofuel B. geothermal power C. hydropower D. nuclear power Which of the following is the most important challenge in the protection of our environment? (1 point) A. Getting society to care about environmental issues. B. Repairing long-term damage done to the environment. C. Cleaning up after a major polluting event, like an oil spill. D. Meeting society's needs while being responsible with natural resources. Which of the following chemicals is not an ozone-depleting substance in the stratosphere? (1 point) A. methyl bromide B.carbon tetrachloride C. xenon D. methyl chloroform Today we use synthetic polymers to replace natural materials such as cotton, wood, and stone. What is one disadvantage of using synthetic materials rather than natural materials? (1 point) A. Synthetic materials are often easy to produce. B. Synthetic materials often do not decay naturally. C. Synthetic materials are often much stronger than natural materials. D. Synthetic materials are often made from strong radioactive materials. Some technologies are now available to solve the problem of acid rain, which can alter the pH level of lakes and rivers. Which of the following is the best technology to improve a lake affected by acid rain? (1 point) A. new alternative energy sources B. recycling of materials to reduce air pollution C. an environmentally safe base to neutralize the lake D. transportation equipment to move all aquatic life to safety Which of the following human environmental accidents has had devastating effects on groundwater, rivers, oceans, and lakes? (1 point) A. harmful pesticides B. nuclear accidents C. ozone depletion D. oil spills When an oil spill occurs in an aquatic environment, what generally is the effect? (1 point) A. The ecosystem is damaged but quickly rebounds. B. No serious damage occurs since oil and water do not mix. C. The abiotic factors are seriously affected, but the biotic are unaffected. D. The whole ecosystem is negatively affected, and long-term damage may occur. Which of the following most correctly predicts the impact on the environment if sustainable practices are not followed? (1 point) A. The ecosystems of the world will be uniformly damaged, but they will rebound quickly. B. Natural resources will be depleted, and the negative impact may be too severe to recover. C. The environment will not be adversely affected because the ecosystem of the world is too large. D. Rain forests will be depleted, but the oceans will be preserved because of their geographical isolation. Heat pollution occurs when an aquatic environment experiences an increase in temperature, which can result in devastating effects to the ecosystem. Which of the following is a major cause of heat pollution? (1 point) A. airports and seaports B. farming and agriculture C. residential housing areas D. factories and power plants

What results from gas particles not having a strong attraction to one another?

Answers

variable volume and variable shape:)

What happens to sound waves then the source of a sound is moving toward you?

Answers

If you are facing the opposite direction of the way the wave is moving, then it will be higher. But, if you are moving the same direction as the wave, it will be lower, because the frequency should go down. Hope this helps! :)

Why is it important for DNA to be duplicated before mitosis

Answers

If it didn't, one cell would end up with the original DNA, the other wouldn't be a functional cell, because it would lack DNA. If the DNA was split between the two cells.

It is true/falseit that when hydrogen cyanide, h c n , dissolves in water, the solution is weakly conducting and acidic in nature. This is because hydrogen cyanide, h c n is a blank that blank support the movement of charge. In addition, since specifically blank formed, the solution is blank.It is blank that when acetone, CH3COCH3, is dissolved in water conducting solution results. This is because acetone, CH3COCH3 is a blank that blank support the movement of charge

The words are:
True, false, weak electrolyte, strong electrolyte, non-electrolyte, does not, does, H+ is, OH- is, no ions are, acidic, basic, neutral.

Answers

Final answer:

HCN is a weak electrolyte that partially ionizes in water and forms an acidic solution as H+ ions are formed, while acetone is a non-electrolyte that does not form ions in water and the resulting solution is neutral.

Explanation:

It is true that when hydrogen cyanide, HCN, dissolves in water, the solution is weakly conducting and acidic in nature. This is because hydrogen cyanide, HCN, is a weak electrolyte that only partially ionizes in water, and hence does support the movement of charge, albeit to a lesser extent than a strong electrolyte. In addition, since H+ ions are specifically formed from the ionization of HCN in water, the solution is acidic.

It is false that when acetone, CH3COCH3, is dissolved in water a conducting solution results. This is because acetone, CH3COCH3, is a non-electrolyte. It does not ionize in water, and therefore does not support the movement of charge. As such, no ions are formed when acetone is dissolved in water and the solution remains neutral.

Learn more about Chemical Solutions here:

brainly.com/question/28945073

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What are two actions that would cause an increase in relative humidity

Answers

relative humidity increases when the amount of moisture air can hold increases.The increase can be caused by the introduction of more moist air OR a temperature drop of the air/moisture mixture without a loss of moisture. Colder air will hold less moisture than warm air;as the temperature goes down the amount of moisture relative to what the air can hold increases

Answer:

cooler air

Explanation:

when an iron nail is placed in an aqueous solution of copper(ii)sulphate,a reaction take place.construct an ionic equation for reaction?​

Answers

The net ionic equation for this reaction is Fe(s) \ + \ Cu^(2+)(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ Cu(s). In ionic equations the soluble compounds are written in their dissociated ion forms. The ionic equation can be determined by knowing the general solubility rules.  In this problem there are sulfate compounds involved. It is important to know that sulfates are generally soluble except for sulfates of Ba, Pb, Ag, and Sr. Therefore, the ones dealt with in this problem, CuSO4 and FeSO4, are both soluble in water.

Further Explanation:

The complete equation for this reaction is:

Fe(s) \ + \ CuSO_(4)(aq) \rightarrow \ FeSO_(4)(aq) \ + \ Cu(s)

CuSO4 and FeSO4 are soluble in water which will lead to the ionic equation:

Fe(s) \ + \ Cu^(2+)(aq) \ + \ SO_(4)^ {2-}(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ SO_(4)^(2-)(aq) \ + \ Cu(s)

Since the sulfate ion appears on both sides, it is a spectator ion. Spectator ions are unchanged in the chemical reaction and are removed from the net ionic equation:

\boxed {Fe(s) \ + \ Cu^(2+)(aq) \ \rightarrow \ Fe^(2+)(aq) \ + \ Cu(s)}

Based on the net ionic equation it can be seen that this is a reduction-oxidation reaction. Iron was oxidized and copper was reduced.

Learn More

  1. Learn more about solubility rules brainly.com/question/11617954
  2. Learn more about redox reactions brainly.com/question/2388654
  3. Learn more about chemical equations brainly.com/question/6976143

Keywords: ionic equation, solubility
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