Gen Science

Question 1

2 ways to present data and differentitate this two

Answer 1

Tables: easy to read and organized presentation

graphs: patterns of data

Question 2

3 types of graphs and define them

Answer 2

Line: 2 continuously changing variables

Bar: categories/ groups

Histogram: frequency

Question 3

Accuracy vs precision

Answer 3

Accuracy: degree of closeness of measurements to its actual value

Precision: closeness of the measurements w each other

Question 4

Differentiate solid, liquid, gas, and plasma from each other

Answer 4

Solid: resistance to change due to strong attraction of molecules

Liquid: does not resist change in shape because molecules are free to move

Gas: molecules are widely dispersed and free to move

Plasma: overall charge-neutral mix of electrons, ions, and neutral atoms

Question 5

Thus is the temperature at which any given substance changes from solid to liquid

Answer 5

Melting/Freezing Point

Question 6

The temperature at which it changes from liquid to gas and vice versa.

Answer 6

Boiling Point

It is also defined as the temperature at which the vapor pressure of a liquid equals the external pressure surrounding the liquid. Therefore, the boiling point depends on atmospheric pressure

Question 7

Describe physical change and it’s types

Answer 7

• no Chem reaction
• substance does not lose its chem identity
• any alteration in the shape and size

Types: melting, evaporating, freezing

Question 8

What type of change is sublimation?

Answer 8

Physical change. Sublimation is the change from solid to gas

Question 9

What is chem change and give example

Answer 9

• the chem composition of each molecule changes
• new substances w new properties r produced
• ex: rust, burn

Question 10

Define a machine (5)

Answer 10

Machines can do any of the ff:
1. Multiply force
2. Multiply speed/distance
3. Change the direction of the force
4. Transfer energy from one place to another
5. Transfer energy from one form to another

Question 11

This type of machine only have one or parts each

Answer 11

Simple machine

Question 12

Machines that use 2 or more simple machines are called?

Answer 12

Conpound/ complex machines

Question 13

This type of simple machine help lift a heavy weight w less effort

Answer 13

Lever

Question 14

This type of simple machine helps carry loads easily, long distances w less effort

Answer 14

Wheel and axle

Question 15

This type of simple machine is a slope/ramp that makes easier to lift objects

Answer 15

Inclined plane

Question 16

This type of simple machine is made of 2 inclined planes and used to push objects apart

Answer 16

Wedge

Question 17

This type of simple machine is an inclined plane wrapped into spiral

Answer 17

Screw

Question 18

This type of simple machine uses wheels and a rope to raise, lower, or move a load

Answer 18

Pulley

Question 19

Formula for density. Which phase of matter has the highest density?

Answer 19

p= mass/ volume

Solid has higher density compared to liquid or gas because it’s particles are very close to another another

Question 20

Climate vs weather

Answer 20

Climate: long term effect of the sun’s radiation

Weather: state of the atmosphere at a particular time and place

Question 21

Elements of Weather

Measurement of the amount of water vapor in the air

Answer 21

Humidity

Question 22

Elements of Weather

It is produced when the droplets and crystals in clouds grow large enough to fall

Answer 22

Precipitation

Question 23

Elements of Weather

It is the horizontal movement of air

Answer 23

Wind

Question 24

Elements of Weather

This forms when excess water vapor in the air condensed into liquid deposits/ice crystals

Answer 24

Clouds

Question 25

It is odorless, tasteless, and colorless. It is also the universal solvent

Answer 25

Water

Question 26

4 distinct stages of hydrologic cycle/ water cycle

Answer 26

Storage, evaporation, precipitation, and run-off