CHEMISTRY HIGH SCHOOL

Which population increases the amount of soil nutrients available to plants? A.
squirrels that bury nuts in the ground

B.
fungi that decompose the remains of dead trees

C.
flowers that turn to follow the sun as it moves across the sky

D.
bees that help spread pollen from one plant to another

Answers

Answer 1
Answer: The population tha increases the amount of soil nutrients available to plants is D) bees that help spread pollen from one plant to another.
Answer 2
Answer:

Answer: D. bees that help spread pollen from one plant to another

Explanation: i took the k12 test and passed :)

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Which type of bond forms between atoms of iron (Fe)?A. ionic
B. Metallic
C. Polar covalent
D. Nonpolar covalent

Answers

Answer:

Metallic

Explanation:

Iron is a metal

An atom of any element must contain(1) an equal number of protons and neutrons
(2) an equal number of protons and electrons
(3) more electrons than neutrons
(4) more electrons than protons

Answers

An atom of any element must contain "(2) an equal number of protons and electrons" but it should be noted that atoms can borrow electrons from one another. 
An atom (which by definition is neutral) should have (2) an equal number of protons and electrons.
If the number of protons and electrons are not equal, it becomes an ion.The number of protons and neutrons can vary widely depending on what the substance is and depending on the isotopes.

Which formulas represent one ionic compound and one molecular compound?

Answers


ionic compounds lose or gain electrons to become stable.
ionic compounds are bonds between metals and nonmetals.

molecular or covalent compounds share one or more electrons to become stable.
molecular or covalent compounds are bonds between nonmetals.

Final answer:

An example of an ionic compound is sodium chloride (NaCl). An example of a molecular compound is carbon dioxide (CO2).

Explanation:

One example of an ionic compound is sodium chloride (NaCl), where sodium (Na) is a metal that forms a positively charged ion and chlorine (Cl) is a nonmetal that forms a negatively charged ion. The formula for a molecular compound is represented by carbon dioxide (CO2), where carbon (C) and oxygen (O) atoms share electrons to form covalent bonds.

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Name two compounds in unpolluted air?

Answers

The two compounds present in unpolluted air are carbon dioxide and water. You may think that carbn dioxide is a greenhouse gas, yes it is and at the same time not. There animals in the earth that produces carbon dioxide into the atmosphere, the carbon dioxide too, is also need for plan respiration. 

Final answer:

Unpolluted air contains small amounts of various compounds. Examples include Carbon Dioxide (CO2) which is used in the process of photosynthesis and Argon (Ar) which remains chemically inactive.

Explanation:

Unpolluted air primarily consists of nitrogen and oxygen, but it also contains small amounts of other gaseous compounds. Two of these compounds found in unpolluted air are carbon dioxide (CO2) and argon (Ar). Carbon dioxide (CO2), which is produced by animals during respiration and used by plants during photosynthesis, and argon (Ar), a noble gas, which is chemically inert and does not directly affect the climate or living organisms.

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The temperature at which a substance in the liquid phase transforms to the gaseous phase refers to the substance's _______.

Answers

The temperature at which a substance in the liquid phase transforms to the gaseous phase refers to the substances boiling point.

Answer:

Boiling Point

Explanation:

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere (760 torr).

A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?

Answers

Answer:

A carbon-14 atom has 6 protons, 8 neutrons and 6 electrons. The number 12 or 14 in the name of carbon-12 and carbon-14 refers to their atomic mass.

Explanation:

Those atoms that have the same "atomic number" but differente "atomic  mass" (or atomic weight) are called isotopes.

Atomic number indicates the amount of electrons that an atom has, which matchs with the number of protons it has.

Atomic mass indicates the sum of protons and neutrons that an atom has.

Example with carbon-12:

carbon atomic number = 6 (find this information in a periodic table)

electrons= 6

protons= 6

carbon atomic mass = 12 (find this information in a periodic table)

neutrons= atomic mass - number of protons= 12-6 = 6 neutrons

Using the same analysis for carbon-14:

carbon atomic number = 6

electrons= 6

protons= 6

carbon atomic mass = 14

neutrons= atomic mass - number of protons = 14-6 = 8 neutrons

In this way, carbon-14 is an isotope of carbon-12 because carbon-14 has the same atomic number than carbono-12 but different atomic mass.
An isotope of carbon always has 6 protons - that is the part of the atom which shows it is carbon. If it had a different number of protons, it would be a different element altogether
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