Characteristics of Chemical Reactions: Review

The substances initially involved in a chemical reaction are the...

A ________ increase or decrease is a sign that a chemical reaction may have occurred.

Which is not evidence of a chemical reaction?

The smallest part of a substance is a:

There are 2 Hydrogen atoms and 1Oxygen atoms before a reaction, how many atoms are there after?

At an atomic level, how do we know when a chemical reaction has occurred?

Which of the following is the best description of the results of a chemical reaction?

An unexpected change in_____ is a sign that a chemical reaction may have occurred.

Rust forming on a piece of iron is an example of which of the following:

A____is a solid that forms in a solution and may indicate that a chemical reaction has occurred

A process that leads to the transformation of one set of chemical substances to another is a:

Which of the following accurately describes the reactants and products in a chemical reaction?

A _____________ is formed when two or more atoms chemically combine.

The substance that is produced from a chemical reaction is the

Substances giving off a smell, or _____ is also an indicator of a chemical reaction.

Atoms that make up a substance are regrouped into different_______to form new substances.