Science Term 3

Question 1

define the term Chemistry

Answer 1

the branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.

Question 2

distinguish chemistry from other branches of science?

Answer 2

Chemistry is a unique branch of science that focuses on the study of matter, its properties, and the changes it undergoes during chemical reactions

Question 3

What are some connections between chemistry and other science branches?

Answer 3

Chemistry is considered a physical science and is closely related to physics.

Question 4

WHAT IS A BEAKER USED FOR?

Answer 4

Beaker: Used for holding, mixing, and heating liquids.

Question 5

WHAT IS A BUSEN BURNER

Answer 5

Bunsen Burner: A gas burner used for heating

Question 6

what is a test tube used for?

Answer 6

Test Tube: A small glass tube used to hold small amounts of substances for experiments and reactions.

Question 7

what is a thermometer used for?

Answer 7

Thermometer: Used to measure temperature.

Question 8

what do you use to weigh?

Answer 8

Balance Scale: Used to measure the mass of substances accurately.

Question 9

Describe a funnel?

Answer 9

Funnel: Used to pour liquids or powders into containers with a small opening.

Question 10

How would a stirring rod be used?

Answer 10

Stirring Rod: A glass or plastic rod used to mix chemicals and liquids.

Question 11

Define and distinguish between the terms observation and inference

Answer 11

An inference is a conclusion or explanation drawn from observations. It involves interpreting the data and applying reasoning. An observation is the act of noting or detecting phenomena through the senses. It involves gathering factual information without any interpretation.

Question 12

Recall the metric (S.I) units for measuring quantities including mass, length, time and temperature

Answer 12

Length-m
Mass-kg
Time-s/seconds
Temperature-°c

Question 13

Convert between different orders of magnitudes for metric units

Answer 13

To convert m to cm, multiply by 100.
To convert cm to mm, multiply by 10.
To convert km to m, multiply by 1000.
To convert kg to grams, multiply by 1000.
To convert grams to mg, multiply by 1000.

Question 14

Identify appropriate instruments to measure mass, length, time and temperature

Answer 14

Tape measure or ruler for lengths
Stopwatch for measuring time
Thermometer for measuring temperature
Balanced scale to measure mass

Question 15

define matter

Answer 15

It’s space and mass determines if it is matter.

Question 16

Identify the 3 states of matter

Answer 16

Solid, liquid, and gas

Question 17

Use a simulation to model the motion of particles in different states of matter

Answer 17

https://th.bing.com/th/id/R.efe85a0aa90471e2183cd85e57c1dfd7?rik=u7UhiolCC3SPZA&riu=http%3a%2f%2fmisswise.weebly.com%2fuploads%2f1%2f8%2f2%2f0%2f18209119%2f4660303.png%3f652&ehk=m%2bg2sQlLEQXIPK2CH1Hw1O5JLHYh%2bfOBNWaV9CRK%2fKY%3d&risl=&pid=ImgRaw&r=0&sres=1&sresct=1

Question 18

Compare the energy of particles of the same substance in different states

Answer 18

In terms of relative energy, gas particles have the most energy, solid particles have the least energy and liquid particles are somewhere in between. (All compared at the same temperature.)

Question 19

how does a state of matter gain or lose energy?

Answer 19

To add or take heat

Question 20

Explain the process of diffusion in gases

Answer 20

Diffusion is the gradual mixing of gases due to the motion of their component particles

Question 21

Recall the names of different changes of states

Answer 21

melting, freezing/solidification, vaporisation (evaporation and boiling) condensation, sublimation and deposition.

Question 22

Define the terms exothermic and endothermic

Answer 22

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.

An endothermic process absorbs heat and cools the surroundings.

Question 23

Classify phase changes as endothermic or exothermic

Answer 23

Here is how you would classify the phase changes as endothermic or exothermic: melting, evaporation and sublimation are endothermic processes while freezing, condensation and deposition are exothermic processes

Question 24

Explain why a scatter graph is an appropriate representation for numerical x and numerical y data

Answer 24

Scatter plots’ primary uses are to observe and show relationships between two numeric variables. The dots in a scatter plot not only report the values of individual data points, but also patterns when the data are taken as a whole.

Question 25

which state of matter shows the most amount of attraction

Answer 25

solid, has the least amount of energy but most attraction.