Matter and change

Which of the following would not be classified as a pure substance?

• element

• solution

• molecule

• compound

Which of the following is a correct statement regarding mixtures?

• mixtures are composed of one substance

• all substances in mixtures are visible at all times

• mixtures are composed of more than one substance

• mixtures have fixed compositions

A student passes a magnet over 10 grams of a powder. Four grams of the powder stick to the magnet, while 6 grams do not. Which of these identifies the substance?

• mixture

• element

• compound

• solution

Which of these will best separate a saltwater solution?

• Using paper filtering system

• allowing the salt to settle

• allowing the water to evaporate

• none of the above

Which of the following is a chemical property of sodium?

• density of 0.968 g/cm³

• silver-white color

• soft at room temperature

• tarnishes when exposed to air

Which of the following is a physical property?

• being black in color

• neutralizing acids

• burning with oxygen

• releasing SO₂ gas

Which of the following properties of a substance could change during a physical change?

• ability to rust

• reactivity with acids

• resistance to bending

• ability to burn in oxygen

Which is one way a chemical property can be witnessed?

• heating a substance to its boiling point

• examining a substance under a microscope

• observing how one substance interacts with another

• passing an electrical current through a substance

Tags

NGSS.MS-PS1-2

The two sides of the above equation appear different. These differences are evidence of a

• mass change

• chemical change

• physical change

• keep the change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following equations is paired correctly with the type of change?

• Physical change: NaCl _(s) → Na _(aq) + Cl^- _(aq)

• Physical change: H₂O _(s) → H₂O _(l)

• Chemical change: CO_{2 (s)} → CO_{2 (g)}

• Physical change: C₆H₁₂O_{6 (s)} + 6 O_{2 (g)} → 6CO_{2 (g)} + 6 H₂O _(l)

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4