Fall Chemistry Exam review

Front

What is the correct name for the compound HBr?

Back

Hydrobromic acid.

Front

What particle did JJ Thomson discover using the Cathode ray tube?

Back

Electrons.

Front

What are the characteristics of molecular compounds?

Back

Made of non-metals & have a definite arrangement.

Front

What type of separation is used to separate salt water by distillation?

Back

Physical.

Front

Which of the following is a mixture of compounds: Air (N2 and O2), P4, C6H12O6, or Salt water (H2O and NaCl)?

Back

Salt water (H2O and NaCl).

Front

What is the definition of a chemical change?

Back

A process where substances combine or break apart to form new substances.

Front

What is the definition of a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is an ion?

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.