Semester 1 Science 7 Review

Which of the following is NOT true about the periodic table?

• Atomic mass is equal to the number of neutrons.

• Elements are listed by their (increasing) atomic mass.

• Groups/families are the elements listed in columns.

• Periods are the elements listed in rows.

Chemical properties are

• an element’s ability to react with other elements.

• an element's ability to change into a gas.

• an elements attraction to water.

• any property which can be observed or measured.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

A physical change...

• changes the physical properties of the elements.

• changes the chemical properties of an element.

• produces new materials.

• combines atoms in a mixture.

Which of the following are true about gas molecules? Choose two.

• the particles move about quickly

• the particles are far apart

• the particles move slowly and vibrate in place

• the particles are close together

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5

Which of the following are true about the molecules in liquids? Choose two.

• The particles slip easily over and around each other

• Will take the shape of its container

• The particles move slowly and vibrate in place

• The particles have a definite shape

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-1

Which of the following are true about solids? Choose two.

• The particles vibrate in place

• Have a definite shape

• The particles move quickly and freely

• The particles take the shape of their container

Which of the following is an example of homogeneous mixture?

• Mixing sugar, lemon juice, and water for lemonade.

• Mixing sand and gravel for the base of a fish tank.

• Mixing oil and vinegar for salad dressing.

• Mixing cereals and nuts for a snack mix.

Materials change from liquid to gas at different temperatures. The specific temperature where this happens is called the...

• boiling point.

• freezing point.

• melting point.

• solidification point.

Which of the following is a compound containing more than one element?

• NaCl

• Be

• S

• Ne

Which of the following chemical formulas has a subscript?

A. H₂O

B. 2HCl

C. NaCl

• A only

• B only

• C only

• A and B