Chemistry Pre Assessment

Which ONE of the following is a physical change?

• melting ice

• burning wood

• rotting food

• rusting iron

Tags

NGSS.MS-PS1-4

How is chemical change different from physical change?

• In a physical change a new substance is formed.

• In a physical change a substance is lost.

• In a chemical change a new substance is formed.

• In a chemical change does not obey law of conservation of mass.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is ONE of the signs of a chemical reaction?

• gas production

• water changing to water vapour

• Ice changing to water

• butter melting

Tags

NGSS.MS-PS1-2

Iron reacts with oxygen to form iron oxide (rust). Which of the following is the correct word equation?

• iron oxide ------> iron + oxygen

• Iron + oxygen ---------> iron oxide

• Iron --------> Iron oxide

• Iron oxide --------> oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

An atom is made up of which of the following subatomic particles:

• protons, neutrinos, electrons

• Protons, positrons, neutrons

• Protons, neutrons, electrons

• electrons, positrons, neutrinos

Tags

NGSS.MS-PS1-1

Which of the following is a definition of a molecule?

• group of atoms chemically bonded together.

• group of electrons held together

• group of protons held together

• group of neutrons held together

Tags

NGSS.MS-PS1-1

The picture shown represents:

• an atom

• a compound

• an electron

• a proton

Tags

NGSS.MS-PS1-1

What is the maximum number of electrons found in the innermost (first) shell.

• 8

• 3

• 5

• 2

Which of the following is the correct Bohr diagram for Lithium - atomic number = 3.

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

What are the two main types of chemical bonds?

• covalent and Van der Waals force

• hydrogen bond and ionic bond

• ionic bond and covalent bond

• hydrogen bond and Van der Waals force

Tags

NGSS.MS-PS1-1