Chem Final Review

The mass number is equal to

• the sum of the number of the neutrons and electrons.

• the sum of the number of protons, neutrons, and electrons.

• the sum of the number of the electrons and protons.

• the sum of the number of protons and neutrons.

• the number of protons

A chemical change

• occurs when baking soda is dissolved in water.

• occurs when methane gas is burned.

• occurs when ice melts.

• occurs when paper is shredded

• occurs when a rubber band is stretched.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If a solution has a temperature of  55 K, what is its temperature in degrees Celsius?

• 12.8°C

• -218°C

• 155°C

• 328°C

• 131°C

Tags

NGSS.MS-PS1-4

Which of the following represents a physical property?

• Sodium metal is extremely reactive with chlorine gas.

• Neon has an unreactive nature.

• Mercury is a silvery liquid at room temperature.

• Methane is highly flammable.

• Copper has a tendency to "rust."

How many moles of Kr are contained in 398 mg of Kr?

• 33.4 mole Kr

• 1.19 × 10^-4 moles Kr

• 2.99 × 10^-3 moles Kr

• 4.75 × 10^-3 moles Kr

• 2.11 × 10^-4 moles Kr

Read the temperature with the correct number of significant figures.

• 87.2°C

• 87°C

• 87.2000°C

• 87.20°C

• 87.200°C

What is the volume (in cm³) of a  43.6 g piece of metal with a density of  2.71 g/cm³?

• 22.3

• 19.5

• 4.30

• 3.33

• 16.1

What species is represented by the following information?

            p+ = 17       n° = 18          e- = 18

• Ar

• Cl-

• Cl

• Ar+

• Kr

Tags

NGSS.MS-PS1-1

How many significant figures are in the measurement,  273.300 m?

• 5

• 3

• 6

• 2

• 4

Identify the description of an atom.

• protons and neutrons in nucleus; electrons in orbitals

• protons and electrons in nucleus; neutrons in orbitals

• neutrons in nucleus; protons and electrons in orbitals

• neutrons and electrons in nucleus; protons in orbitals

• electrons in nucleus; protons and neutrons in orbitals

Tags

NGSS.MS-PS1-1