Physical Science Midterm Review Part II

A group of atoms that acts as a unit is called a(n)

You put 1 spoonf of salt into 1 liter of water and stir. The resulting liquid is a(n)

Which of these statements is not part of Dalton’s atomic theory?

What determines the speed of the atoms and molecules of a particular substance?

Group 17 elements form

Elements that have one valence electron tend to

Which of the following is an element?

What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

When ice melts to form liquid, energy is

Semiconductors are elements that

The periodic law states that elements that have similar properties appear

A sodium atom, which has 11 electrons, has _____ electron(s) in its outermost energy level.

Democritus’s original atomic theory was revised because it

Thomson is responsible for discovering that an atom contains

Atoms of elements that are in the same group have the same number of

The process of a liquid becoming a gas is called

The chemical formula for a compound consisting of potassium and oxygen would be

Which of the following elements is an alkali metal?

The change of a substance from a solid directly to a gas is called

Temperature is a measure of the average _____ energy of the particles in the object.

Each column of the periodic table is

Atoms that gain or lose electrons are called

The temperature at which a substance changes from a liquid to a solid is the

The name of the compound NF2 would be

In _____ atomic model, negative electrons orbit the positively charged nucleus.

Which of the following is not a pure substance?

The charge of an atom is

An object’s volume can be found by dividing its mass by its

In Mendeleev’s periodic table, elements in each column had similar

All matter is made of atoms and molecules that are

A chemical property of copper is its

Which of the following statements not true?

The law of conservation of mass states that mass cannot be

An element’s atomic number is equal to its number of

Atoms have no electric charge because they

Solids, liquids, and gases are three forms of matter that

A material that can be represented by a chemical formula is

A state of matter that is not a fluid is

Mendeleev left gaps in his periodic table because

Two different isotopes of an element have different