Quiz 2

Question 1

Chemical reaction

Answer 1

A process, in which a substance is changed into one or more new substances

Question 2

Chemical equation

Answer 2

Using chemical symbols to show what happens during a chemical reaction

Question 3

Chemical symbols in equations

Answer 3

+ means “reacts with”
-> means “to yield”

Question 4

Reactants

Answer 4

The starting materials in a chemical reaction (on the left side of the equation)

Question 5

Products

Answer 5

The substance formed as a result of a chemical reaction (the right side of the equation)

Question 6

The states

Answer 6

The states of the reactants and products are written and parenthesis to the right of each compound
g means Gas
l means liquid
s means solid
aq means aqueous solution 

Question 7

Subscripts 

Answer 7

Subscripts present within a formula, and tell the number of atoms of each element in a molecule
الرقم الصغير اللي يسار العنصر تحت

Question 8

Coefficients

Answer 8

Are inserted in front of a formula to balance the equation
المعاملات

Question 9

Stoichiometry

Answer 9

The quantitative study of reactants and the products in a chemical reaction 

Question 10

Mole method

Answer 10

The stoichiometric coefficients in a chemical equation can be interpreted as a number of moles of each substance

Question 11

Limiting reagent (limiting reactant)

Answer 11

Reactors used up first in a reaction
When does reactant is used up, no more product can be found 

Question 12

Excess reagents

Answer 12

The reactants present in quantities greater than necessary to react with the quantity of the limiting reagent