20-21 Science Final Exam Review

What is the identity of the atom shown?

• Oxygen

• Nitrogen

• Boron

• Carbon

Answer explanation

Since this atom has 7 electrons, that means it has 7 protons, which makes it Nitrogen.

How many valence electrons does this atom contain?

• 2

• 5

• 7

• 8

Answer explanation

Valence electrons are only on the last energy level.

Which of the following is NOT a basic component of at atom?

• proton

• neutrino

• neutron

• electron

Which subatomic particles are located in the nucleus of an atom? Check all that apply.

• protons

• neutrons

• electrons

• quarks

Which of the following describes a proton?

• outside the nucleus, positive charge, no mass

• inside the nucleus, negative charge, mass = 1 amu

• inside the nucleus, positive charge, mass = 1 amu

• outside the nucleus, positive charge, mass = 1 amu

Where are the electrons located in an atom?

• inside the nucleus

• outside the nucleus

• always in the same place

• paired with neutrons

Which of the following is a compound?

• oxygen

• carbon

• sodium

• carbon dioxide

During a chemical reaction, the mass of the reactants must equal the mass of the products. This is known as the -

• Law of Conservation of Mass

• Law of Conservation of Energy

• Law of Physics

• Law of Inheritance

Velocity is described as -

• speed with time

• speed with direction

• acceleration and direction

• acceleration and speed

Which of the following is an example of acceleration? (Check all that apply)

• speeding up

• slowing down

• changing direction

• constant speed