Question

Three examples of physical change are ____.


burning of gasoline, rotting of an egg, and exploding fireworks


sawing of wood, crushing a can, and toasting a marshmallow


freezing of water, evaporation of gasoline, and rusting a nail.


boiling of water, bursting of a balloon, and crumpling a piece of paper


Each substance to the right of the arrow in a chemical equation is a(n) _____.


product


catalyst


inhibitor


reactant


What is the total number of atoms in the compound Ca3(Cl3)2


3


9


2


5


What kind of chemical bond is formed when an equal exchange of electrons occurs?


ionic


magnetic


hydrate


covalent


Elements that are gases, brittle, and are poor conductors at room temperature are ____.


nonmetals


radio active elements


metals


metalloids


At room temperature, most metals are _____.


gases


solids


radioactive


liquids


When a log burns in a fire, _____________.


a physical change has occured.


mass is gained.


mass is lost.


new substances are formed.


In a solution, the substance that is being dissolved is the _______.


liquid


solvent


solute


gas

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is ____.


52


26


56


30

Answer 1

1) boiling of water, bursting of a balloon, and crumpling a piece of paper

2) product

3) 9

4) covalent

5) nonmetals

6) solids

7) new substances are formed

8) solute

9) 56