CHEMISTRY HIGH SCHOOL

Both Democritus and Dalton suggested that matter is made up of atoms

Answers

Answer 1
Answer: Yes because they both have changed atoms overtime

Hope this helps!

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Describe two human activities that can affect the water cycle.
How can flood water affect the public drinking water supply?
What are metalloids used for
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products? a) The product is doubled. b) The product is half the mass of the reactants. c) The mass is the same. d) The mass changes depending on the reaction.

The _______ is the total number of organisms that an ecosystem can support.a. tolerance range
b. carrying capacity
c. competitive exclusion principle
d. population

Answers

Answer;

B. Carrying capacity

Explanation;

-The carrying capacity in a biological ecosystem is the maximum population size of the species that the environment can sustain indefinitely, given the food, habitat, water, and other necessities available in the environment. This is without degrading the natural social, cultural and economic environment for present and future generations.

B. Carrying capacity

Which is true about fossil fuels? A.
Coal came from ancient plants, while oil and natural gas came from marine organisms.

B.
Oil and coal came from dinosaurs, while natural came from marine organisms.

C.
Coal came from marine organisms, while oil and natural gas came from fish.

D.
Natural gas and oil came from ancient plants, while coal came from dinosaurs.

Answers

A. i just did this test
The correct answer would be D. Natural gas and oil came from ancient plants, while coal came from dinosaurs.

Check all that indicate a chemical change. Check all that apply. Group of answer choices aqueous solutions of silver nitrate and sodium chloride turn cloudy after mixing aqueous solutions of hydrochloric acid and sodium hydrogen carbonate produces bubbles on mixing Sodium hydroxide is mixed with water and the container feels warmer Water is added to orange juice is the color becomes lighter. No answer text provided. ice melts on a bench top at room temperature

Answers

Answer:

aqueous solutions of silver nitrate and sodium chloride turn cloudy after mixing aqueous solutions of hydrochloric acid and sodium hydrogen carbonate produces bubbles on mixing Sodium hydroxide is mixed with water and the container feels warmer

Explanation:

A chemical change involves the formation of new substances. Also heat is absorbed or released in a chemical change. Another name for a chemical change is a chemical reaction.

In the first case, a reaction of the sort;

AgNO3(aq) + NaCl(aq) ---> AgCl(s) + NaNO3(aq)

The cloudy solution is due to the formation of AgCl precipitate.

In the second case, a reaction of the sort;

HCl(aq) + NaHCO3(aq) ---> NaCl(aq) + CO2(g) + H2O(l)

The gas evolved is due to the formation of CO2 in the process. Heat is also evolved showing that it is a chemical change.

The Resource Conservation and Recovery Act controls hazardous waste from its creation to its disposal. Please select the best answer from the choices provided. T F

Answers

Answer:

True

Explanation:

Resource Conservation and Recovery Act (RCRA). 1976 of United States Environmental Protection Agency(EPA) empowers EPA to control the production, transportation, storage, treatment and disposal of hazardous waste. The RCRA act was amended in 1984 and 1986 to include Waste minimization along with appropriate disposal (not in the landfill site) and tackling of petroleum hazardous waste respectively along with other waste.

Answer:

true is the correct answer.

Explanation:

  • The Resource Conservation and Recovery Act controls hazardous waste from its creation to its disposal is true.
  • The Resource Conservation and Recovery Act is the nation's premier law directing the control of solid and hazardous waste.
  • To control the increasing problems that the nation is facing from the municipal waste and the industrial waste Resource Conservation and Recovery Act was signed.
  • Resource Conservation and Recovery Act goals are to eliminate the quantity of waste produced and to protect  the human health and the atmosphere from the dangers posed with waste disposal

Which of the following particles has the greatest mass? A)An alpha particle B) A Beta Particle C) A Proton D) An Electron

Answers

The answer is c) a proton

You have two bottles of water. One bottle is left outside in the sun for two hours. The other is left in an air-conditioned room for the same amount of time. What would you expect to observe after the two hours?The bottle left outside will have lower vapor pressure than the bottle from the room.

The bottle left outside will have the same vapor pressure as the bottle inside the room because they both contain water.

The bottle left outside will have higher vapor pressure than the bottle from the room.

No change to either bottle.

Answers

You have two bottles of water. One bottle is left outside in the sun for two hours. The other is left in an air-conditioned room for the same amount oftime. After 2 hours, I would expect that the bottle left outside will have higher vapor pressure than the bottle from the room.
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