Changes of Matter and Atomic Structure

What does the 14 in Carbon-14 represent?

• # of electrons

• # of protons

• atomic mass

• mass number

Which best represents the number of protons in a particular element?

• atomic mass

• mass number

• atomic number

• atomic weight

Sodium has the atomic number 11. It's mass number is 24. How many protons, electrons, and neutrons does the element have?

• 12 protons, 11 neutrons, 12 electrons

• 11 protons, no neutrons, 11 electrons

• 11 protons, 13 neutrons, 11 electrons

• 11 protons, 12 neutrons, 11 electrons

Tags

NGSS.MS-PS1-1

What equation would you use to find the # of neutrons?

• neutrons = mass + protons

• neutrons = protons + electrons

• neutrons = mass - protons

• neutrons = mass - atomic weight

Which of these best describes the atomic number?

• 22.33

• 22

• 22+

• 22-

Which atoms the greatest mass?

• an atom with 9 protons, 10 neutrons, 9 electrons

• an atom with 8 protons, 8 neutrons, 8 electrons

• an atom with 9 protons, 11 neutrons, 9 electrons

Most of the mass of the atom is located ...

• in the nucleus

• surrounding the nucleus

Tags

NGSS.HS-PS1-8

Physical properties can be observed without changing the chemical makeup of the substance.

• True

• False

Which are chemical properties (select all that apply)

• reactivity

• toxicity

• flammability

• corrosion

Tags

NGSS.MS-PS1-2

Boiling point, melting point, smashing, folding, measuring, freezing point are ALL examples of physical properties

• True

• False