CHEMISTRY HIGH SCHOOL

The calcium carbonate found in limestone was originally extracted from _______.a. seawater
b. shale
c. magma
d. silt

Answers

Answer 1
Answer: The calcium carbonate found in limestone was originally extracted from A. SEAWATER.

Limestone is a sedimentary rock. It was formed from small rock or stone particles that have been compacted by pressure. It can be formed either by evaporation or with the help of living organisms.

Calcium carbonate in seawater are used by ocean-dwelling organisms to create their shells and bones; like corals, clams, oysters. When these organism die, their shells and bones are broken down by the waves and settle on the ocean floor where the pressure of the ocean water drives these sediments together to create limestone.

Limestone is created through evaporation. When water containing calcium carbonate evaporates it leaves behind the sediment deposit which in turn becomes limestone after being subjected to the water pressure.
Answer 2
Answer:

Answer:

Awnser is A

Explanation: just took the test

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a. True
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Answers

Answer: False

Explanation: The moon travels at 1.42 mph around the Earth.

Answer:

false

Explanation:

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Answers

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A physical change is __________ if energy is given off.Select one:
a. exothermic
b. endothermic
c. a chemical change
d. not possible

Answers

Answer:

A

Explanation:

Chemical reactions can be detected by the formation of a gas.
a. True
b. False

Answers

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A tire at 21°C has a pressure of 0.82 atm. Its temperature decreases to –3.5°C. If there is no volume change in the tire, what is the pressure after the temperature change?

Answers

Using ideal gas equation, PV = nRT, and since there is no volume change and amount change, the equation is now P = kT, where k =nR/V. Temperature must be in kelvin From the given, k = (0.82)/ (21 + 273) = 2.78 x 10^-3 Substituting T = -3.5+273, P = 0.75 atm

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Polymers are formed by joining several units called monomers. What does the term monomer refer to?A) A unit made up of several compounds.
B) A unit made up of several atoms.
C) A unit made up of several molecules.

Answers

The term monomer refers to a unit made up of several atoms.This will make the correct answer B.

The term monomer refers to:

a unit made up of several atoms

Explanation:

A monomer is a molecule that "can support polymerization whereby providing constitutional units to the fundamental structure of a macromolecule". Large quantities of monomers combine to form polymers in a method called polymerization.
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