Gr.10 T3 (2) Physics and Chemistry

Question 1

What are allotropes?

Answer 1

Forms part of the same element with different chemical and physical properties.

Question 2

What are ionic substances?

Answer 2

Reaction between metal and non-metal.

Question 3

What are salts?

Answer 3

Any ionic compounds

Question 4

What is physical change?

Answer 4

A rearrangement of particles that does not alter the chemical nature of the substance.

Question 5

What is chemical change?

Answer 5

A change where the chemical nature of the substance involved changes.

Question 6

What is the law of conservation of mass?

Answer 6

In a chemical reaction, the sum of the mass of the reactants equals the sum of the mass of the products.

Question 7

What is an exothermic reaction?

Answer 7

More energy is released when bonds are formed than what is needed to break original bonds.

Question 8

What is an endothermic reaction?

Answer 8

More energy is absorbed to break bonds than what is formed to make new bonds.

Question 9

What is mechanics?

Answer 9

The study of movement.

Question 10

What is physical quantity?

Answer 10

Shows characteristics of an object. Can be measured.

Question 11

What three things does a vector have?

Answer 11

Magnitude, direction and a unit.

Question 12

What two things does a scalar have?

Answer 12

Magnitude and a unit.

Question 13

What is a resultant vector?

Answer 13

A single vector that has the sum of two or more vectors that has the same effect as the combined individual vectors.

Question 14

What is another name for the resultant vector?

Answer 14

A net vector

Question 15

What is distance?

Answer 15

The length that you move away from your original position.

Question 16

What is displacement?

Answer 16

The change in position of an object.

Question 17

What is speed?

Answer 17

The distance covered over a specific time period.

Question 18

What is the formula for average speed?

Answer 18

distance (m)
Average speed= _____________
time (s)

Question 19

What is the formula for average velocity?

Answer 19

displacement (m)
Average velocity= ___________________
time (s)

Question 20

What is velocity?

Answer 20

The rate of change in displacement.

Question 21

What is constant/ uniform velocity?

Answer 21

An object covers equal distances in equal time intervals, and the direction does not change.

Question 22

What is a ticker timer?

Answer 22

Equipment used to measure short time intervals accurately.

Question 23

-1 -1

Convert 1 km.h to m.s

Answer 23

-1

0,2778 m.s