Middle School Unit 2 Study Guide

Which sentence is not true?

• Matter is anything that has mass and takes up space.

• Atoms can form more than one compound with each other.

• All atoms of the same element are exactly alike.

• People’s weight stays the same wherever they go.

How is mass different from weight?

• Mass depends on gravity, but weight does not.

• Weight is always less than mass.

• Weight depends on gravity, but mass does not.

• Mass is always less than weight.

According to Dalton’s atomic theory, an atom can be broken up into smaller, similar particles.

• True

• False

Why do electrons stay around the nucleus instead of just floating inside of the atom?

• The negative electrons are attracted to the nucleus; the nucleus is positive.

• The negative electrons are attracted to the nucleus; the nucleus is negative.

• The positive electrons are attracted to the nucleus; the nucleus is negative.

• The positive electrons are attracted to the nucleus; the nucleus is positive.

Which of the following sentences is true?

• Electrons are positive, protons are negative, and neutrons are neutral.

• Electrons are positive, protons are negative, and neutrons are negative.

• Electrons are negative, protons are positive, and neutrons are neutral.

• Electrons are negative, protons are positive, and neutrons are positive.

Protons and neutrons are located inside the nucleus of an atom.

• True

• False

According to John Dalton and the atomic theory, which of the following is false?

• Matter is made up of atoms.

• Atoms cannot combine with other atoms to form compounds.

• All atoms of the same element are exactly alike.

Where are electrons located in an atom?

• Only in the center of the atom.

• Inside the nucleus with the protons and neutrons.

• Orbiting outside the nucleus in the electron cloud.

• Scattered randomly throughout the atom.

What does the text say about the Bohr model of an atom?

• It is a perfect picture of what an atom looks like.

• It shows the exact size of an atom.

• It clearly shows all the parts of an atom, but not its real size.

• It only shows the electrons in an atom.

What particles are located in the nucleus of an atom, according to the text?

• Only electrons.

• Protons and electrons.

• Protons and neutrons.

• Neutrons and electrons.