Unit 3 PreCheck

What are the basic particles that make up atoms?

• Protons, electrons, and photons

• Electrons, photons, and positrons

• Electrons, positrons, and neutrons

• Protons, neutrons, and electrons

Tags

NGSS.MS-PS1-1

How are elements arranged on the periodic table?

• By atomic number

• By mass number

• By density

• By color

What holds two or more atoms together to form new substances?

• Kinetic energy

• Magnetic forces

• Bonds

• Gravity

How do we represent compounds in chemistry?

• By atomic number

• By mass number

• By chemical symbols

• By physical properties

Tags

NGSS.MS-PS1-1

Which of the following elements comprises the largest portion of the solid Earth, living matter, the oceans, and the atmosphere?

• Hydrogen

• Carbon

• Oxygen

• Nitrogen

What particles are in the center of the atom?

• neutrons, electrons, and protons

• electrons and protons

• protons only

• protons and neutrons

All atoms of gold are similar, but are different from all atoms of silver.

• True

• False

When two substances come in contact and start to react, what can be used to model this reaction?

• chemical formulas

• chemical symbols

• chemical changes

• chemical equations

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

How many electrons does an atom of an element typically have?

• Half the number of protons

• Double the number of protons

• Equal to the number of protons

• It varies widely

Which of the following represents an element?

• H2O

• NaCl

• O2

• Fe