Test 11 PreTest

In a chemical equation, all substances written to the left of the arrow are ______.

• reactants
• products
• ingredients
• chemical formulas

Looking at the picture, is this chemical equation balanced?

• Yes
• No

In this picture, what is circled is also known as the _______.

• reactants
• products
• ingredients
• chemical formulas

Count the atoms in the given formula.

• 2 Carbon, 2 Oxygen, 2 hydrogen
• 2 Calcium, 2 Oxygen, 2 Hydrogen
• 1 Calcium, 2 Oxygen, 2 Hydrogen
• 1 Calcium, 1 Oxygen, 2 Hydrogen

In an exothermic reaction, energy is released so the substance feels ______.

• cold
• hot
• luke warm
• temperature doesn't change

In an endothermic reaction, energy is absorbed so the substance feels ______.

• cold
• hot
• luke warm
• temperature doesn't change

The equation pictured can best be described as _____.

• exothermic
• endothermic

Does this image represent the law of conservation of mass?

• Yes
• No

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

• They both will weigh the same
• The product always weighs more than the reactant
• The reactant will weigh more than the product
• They both will loose mass after the reaction

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The number to the lower side of an element is a 

• Subscript
• Superscript
• Coefficient
• Charge