Physical Science Sem 2 Review

An atom is:

• a large molecule

• the smallest unit of matter

• a type of energy

• a chemical reaction

Tags

NGSS.MS-PS1-1

Where are the protons, neutrons, and electrons in an atom?

• Protons and neutrons are in the nucleus; electrons are outside the nucleus.

• Protons and electrons are in the nucleus; neutrons are outside the nucleus.

• All are in the nucleus.

• Protons are outside the nucleus; neutrons and electrons are in the nucleus.

What are the charges of protons, neutrons, and electrons?

• Proton: positive, Neutron: neutral, Electron: negative

• Proton: negative, Neutron: positive, Electron: neutral

• Proton: neutral, Neutron: negative, Electron: positive

• Proton: negative, Neutron: neutral, Electron: positive

The masses of protons, neutrons, and electrons compare as follows:

• Protons and neutrons have similar masses, much greater than electrons.

• Electrons have the greatest mass, followed by protons, then neutrons.

• Protons have the least mass, followed by neutrons, then electrons.

• All three have approximately the same mass.

How does the size of the nucleus compare to the electron cloud?

• The nucleus is much smaller than the electron cloud.

• The nucleus is much larger than the electron cloud.

• The nucleus and electron cloud are about the same size.

• The nucleus is slightly smaller than the electron cloud.

The difference between a pure substance and a mixture is:

• A pure substance contains only one type of particle, while a mixture contains two or more different particles.

• A pure substance can be separated by physical means, while a mixture cannot.

• A mixture has a fixed composition, while a pure substance does not.

• A pure substance is always a solid, while a mixture is always a liquid.

An element is:

• a substance that contains only one type of atom

• a mixture of two or more substances

• a type of chemical reaction

• an atom

A compound is:

• a mixture of two or more substances

• a substance made of two or more elements chemically combined

• a single element

• a physical blend of elements

A mixture is:

• a pure substance

• a combination of two or more substances that are not chemically combined

• an element

• a compound

What does the atomic number on the periodic table tell you about the element?

• The number of protons in the element

• The number of neutrons in the element

• The atomic mass of the element

• The number of electrons in the outer shell