Chemistry of Life Review

Which two types of particles are present in equal numbers in an atom, but not in an ion?

• protons and electrons

• protons and neutrons

• neutrons and electrons

• inner and outer shell electrons

Tags

NGSS.MS-PS1-1

When elements combine in a chemical reaction, they form a new compound. The new compound will have _ properties compared to the elements.

• very different

• similar

• identical

• a mixture of

Tags

NGSS.MS-PS1-2

If acid rain causes a lake's pH to decrease, what could happen?

• The flow rate will increase

• The flow rate will decrease

• The number of fish will increase

• The number of fish will decrease

Tags

NGSS.MS-LS2-4

Which answer accurately describes a hydrogen bond?

• an attraction between positive ends of two molecules

• an attraction between negative ends of two molecules

• an attraction between neutral ends of two molecules

• none of these

Which type of bond allows the atoms in a water molecule to stay together?

• covalent

• ionic

• hydrogen

• metallic

Tags

NGSS.MS-PS1-1

What changes an atom into an ion?

• sharing of electrons

• gain or loss of electrons

• gain or loss of neutrons

• a chemical reaction

Why is carbon able to form a large number of different molecules?

• carbon only forms ionic bonds

• carbon only forms ring structures

• carbon can form four covalent bonds

• carbon forms small simple structures

Tags

NGSS.HS-LS1-6

Ice floats because...

• it is colder than liquid water

• its molecules are moving faster than liquid water

• it is more dense than liquid water

• its water molecules are farther apart than in liquid water

Tags

NGSS.MS-PS1-4

Elements are pure substances consisting of...

• one type of atom

• at least two types of atoms

• at least three types of atoms

Tags

NGSS.MS-PS1-1

What determines the identity of an atom?

• Number of protons

• Atomic mass

• Number of electrons

• Charges

Tags

NGSS.MS-PS1-1