Chemical equations

Question 1

What is law of conservation of mass

Answer 1

atoms are never destroyed or created in a chemical reaction

Question 2

what is a skeletal equation

Answer 2

unbalanced chemical equation

Question 3

name 7 diatomic elements (2 atom)

Answer 3

hydrogen, nitrogen, fluorine, chlorine, bromine, Iodine, oxygen

Question 4

coefficient

Answer 4

number in front & multiples the number of each in formala 2H (2 x H)

Question 5

subscript

Answer 5

how many atoms of each element are present

Question 6

what is a balanced equation

Answer 6

numr of atoms on the reactant and product side balance

Question 7

how do you balance an equation

Answer 7

adjust the coefficient

Question 8

what is a polyatomic atom

Answer 8

a group of atoms carrying a charge (positive or negative) EXAMPLE S04

Question 9

all chemical reactions have a change in energy?

Answer 9

YES

Question 10

the law of conservation of energy

Answer 10

total energy of the universe is constant energy cannot be created or destroyed BUT TRANSFERRED

Question 11

how do bonds get broken

Answer 11

energy must be absorbed

Question 12

how do bonds form

Answer 12

energy is released

Question 13

what is exothermic reaction

Answer 13

a chemical reaction in which there is a release (EXIT) of energy into the surroundings EXO/EXIT

Question 14

what is an endothermic reations

Answer 14

a chemical reaction in which the energy is ABSORBED ENDO/ENTER

Question 15

EXO THERMIC

Answer 15

GETS HOT

Question 16

ENDO THERMIC

Answer 16

GETS COOL

Question 17

What is a covalent bond

Answer 17

sharing of elcectrons between molecues - non metal & non metal