GR 10 CHEM NO2 + ACIDS AND BASES

Question 1

a + b =ab

Answer 1

addition or synthesis

eg. h2 + o2 = h2o

Question 2

ab = a+ b

Answer 2

decomposition

eg, h2co3 = h2o + co2

Question 3

a + bc = ac + b

Answer 3

single displacement

eg. Zn + CuSO4 = ZnSO4 + Cu

Question 4

ab + cd = ad + cb

Answer 4

double displacement

eg. AgNO3 + KBr = AgBr +KNO3

Question 5

Combustion is

Answer 5

rapid reaction of a substance with oxygen to produce now substances called oxides

Question 6

combustion equaion or law idk

Answer 6

fuel + oxygen = oxide + energy (exothermic energy)

Question 7

incomplete cumbustion

Answer 7

occurs if there isnt enough 02 gas available LMAO L

Question 8

properties of acids

Answer 8

sour tasting
water soluble
reacts with reactive metals

Question 9

properties of bases

Answer 9

bitter tasting
water soluble

Question 10

HX(S) = H+(AQ) + X (AQ)

Answer 10

general formula for acids dissolving in water

Question 11

X(OH) (S) = X+ (AQ) +(OH)- (AQ)

Answer 11

general formula for bases dissolving in water

Question 12

acids are also called

Answer 12

electrolytes

Question 13

congo red in stomach acid with a PH of 1.52

Answer 13

blue/grey

Question 14

bromothoyal blue in sugar solution with pH of 7

Answer 14

pink

Question 15

neutralization reaction

Answer 15

chemical reaction in which acid reacts with base to form salt and water. it is type of double replacement reaction. (e.g. HCl + NaOH = H2O + NaCl)

Question 16

pH scale

Answer 16

used to measure pH. ranges from 0-14, if solution has pH if less than 7, it’s acidic. basic solutions have pH of greater than 7. neutral substances have pH of equal to 7.

Question 17

acid-base indicators

Answer 17

used to identify acids and bases by changing colours

Question 18

hydrocarbon

Answer 18

A compound that consists of carbon and hydrogen. general equation for combustion of hydrocarbon is CxHy + O2 = CO2 + H2O. hydrocarbon combustions are exothermic.

Question 19

exothermic reaction

Answer 19

chemical reaction in which there is net release of energy to surroundings. temperature increases as energy is released into surroundings

Question 20

endothermic reaction

Answer 20

chemical reaction in which there is net absorption of energy from the surroundings. temperature decreases as energy is absorbed by system

Question 21

activation energy

Answer 21

minimum amount of energy needed for reaction to happen

Question 22

how do u balance a chemical equation

Answer 22

number of atoms on the reactant side must equal number of atoms on product side.

law of conservation of mass is reflected in balanced chemical equation.

use coefficients in front of chemical formula

Question 23

coefficients

Answer 23

indicate how many molecules are present (in 2S8, 2 is the coefficient)

Question 24

law of conservation of mass

Answer 24

in a chemical reaction, the total mass of the substances used is equal to the total mass of the substances produced