Midterm Prep #1

The two most important properties of all matter are

• the ability to carry an electric

  current well and to hold electric charge.

• taking up space and having mass.

• being brittle and hard.

• being malleable and ductile.

Tags

NGSS.HS-PS1-1

Which of the following is not a physical change?

• grinding

• cutting

• boiling

• burning

Which of the following is an extensive property of matter?

• melting point

• boiling point

• volume

• density

A homogeneous mixture is also called

• chemically bonded

• a compound

• a solution

• a solute

Under ordinary conditions of temperature and pressure, the particles in a gas are

• closely packed

• very far from one another

• held in fixed positions

• unevenly distributed

Tags

NGSS.HS-PS2-1

Nitrogen monoxide and oxygen, both colorless gases, form a red-brown gas when mixed. Nitrogen monoxide and oxygen are called the

• products

• equilibria

• synthetics

• reactants

Which of the following is not a chemical change?

• rusting

• igniting

• melting

• burning

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

0.25 g is equivalent to

• 250 kg

• 250 mg

• .025 mg

• .025 kg

These values were recorded as the mass of products when a chemical reaction was carried out three separate times: 8.83 g; 8.84 g; 8.82 g. The mass of products from that reaction is

8.60 g. The values are

• accurate, but not precise

• precise, but not accurate

• both accurate and precise

• neither accurate or precise

Tags

NGSS.HS-PS1-7

The number of significant figures in the measurement 0.000 305 kg is

• 2

• 3

• 6

• 7