S4 T9 L1&2 Study Guide

12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 

• 
  28 g

• 14 g

• 30 g

• 32 g

What do we call the chemicals that result from a chemical reaction?

• 
  reactants

• products

• subscripts

• coefficients

Jamie weighs a glass of water and observes its mass to be 200 grams. Jamie then adds 6 ice cubes to the glass of water. Each ice cube has a mass of 10 grams. After all of the ice cubes have melted, what will be the approximate mass of the glass of water?

• 
  60 g

• 100g

• 260 g

• 300g

Why does this picture demonstrate the Law of Conservation of Mass?

• 
  the number of atoms of each element are the same on both sides

• 
  the same elements are used

• 
  they start out separate and end up combined

• it doesn't demonstrate the Law of Conservation of Mass

How many atoms are in the products below? 4Fe +30₂ → 2Fe₂​O_3​  

• 3

• 5

• 7

• 10

Which of these is a result of a chemical change?

• 
  A mixture

• A solution

• A new substance

• Melting or freezing

What will weigh more when a chemical change is complete? The reactants or the products?

• They both will weigh the same

• The reactant will weigh more than the product

• The product always weighs more than the reactant

• They both will loose mass after the reaction

How many Hydrogen atoms are in 4H₂O?

• 2

• 4

• 6

• 8

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• change of state

• formation of a gas

• melting

What always happens in a chemical change?

• 
  A change in state of the substance (ex. liquid to solid)

• 
  A change in texture of the substance.

• 
  A change in the way atoms are bonded to each other

• A change in the appearance of the substance.