Question 1

Which of the following statements best describes matter?

Accepted Answer

Matter is anything that takes up space.

Question 2

Which subatomic particle has a negative charge?

Accepted Answer

Electron

Question 3

Where are neutrons located in an atom?

Accepted Answer

In the nucleus (center)

Question 4

Which of the following molecules contains two nitrogen atoms and one oxygen atom?

Accepted Answer

$$\mathrm{N_2O}$$

Question 5

What type of bond involves the sharing of electrons between atoms?

Accepted Answer

Covalent bond

Question 6

Which property of water is MOST important for regulating Earth's climate?

Accepted Answer

Water can absorb lots of heat and release it slowly.

Question 7

What is the chemical formula for methane?

Accepted Answer

$$\mathrm{CH_4$}$$

Question 8

Which of the following is an example of an element?

Accepted Answer

Oxygen

Question 9

What is the main difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve donating electrons, covalent bonds involve sharing electrons.

Question 10

Which statement about the First Law of Thermodynamics is correct?

Accepted Answer

Energy cannot be created or destroyed but can be converted into different forms.

Question 11

Which molecule is composed of two oxygen atoms?

Accepted Answer

$$\mathrm{O_2$}$$

Question 12

What is the pH value of pure water?

Accepted Answer

7

Question 13

Which of the following best explains why there are fewer top predators in an ecosystem?

Accepted Answer

Energy is lost as heat and waste at each step of the food web, leaving less for top predators.

Question 14

Which type of energy is stored in the chemical bonds between atoms?

Accepted Answer

Chemical energy

Question 15

What is the main function of hydrogen bonds in water?

Accepted Answer

They allow water molecules to stick together and form drops and films.

Question 16

Which of the following is true about acids in water?

Accepted Answer

Acids release $$\mathrm{H^+}$$ ions when dissolved in water.

Question 17

If a solution has a pH of 2, what can you conclude about it?

Accepted Answer

It is acidic.

Question 18

Which process allows plants to convert radiant energy into chemical energy?

Accepted Answer

Photosynthesis

Question 19

What is the Second Law of Thermodynamics as it applies to energy conversions in ecosystems?

Accepted Answer

Some energy is always lost as heat during energy conversions.

Question 20

Which of the following best describes an ion?

Accepted Answer

An atom that has lost or gained an electron.

Matter, Atoms, Chemical Bonds, Water, and Energy Flow in Biological Systems

Study Guide - Practice Questions