name 2 substances that can enter the atmosphere and affect weather

NAME 2 SUBSTANCES THAT CAN ENTER THE

ATMOSPHERE AND AFFECT WEATHER.

1. Volcanic ash from an eruption. 2. Greenhouse gases like: Carbon dioxide, water vapor and methane gas.

WHAT IS A HYPOTHESIS?

A HYPOTHESIS IS AN EDUCATED GUESS

HOW MANY FACTORS ARE CHANGED IN A GOOD EXPERIMENT? WHAT HAPPENS TO THE REST?

In a good experiment only ONE variable is changed and the rest remain CONSTANT (unchanged).

HOW IS A CONTROL GROUP DIFFERENT FROM AN EXPERIMENTAL GROUP?

The control group is given the NORMAL treatment, or a PLACEBO, fake pill, etc.

The experimental group is given the new the new treatment, what is being tested.

IF ASKED TO DESCRIBE THE RELATIONSHIP BETWEEN TWO VARIABLES ON A GRAPH, WHAT SENTENCE FORMAT SHOULD WE USE?

AS _______INCREASES, ______DOES THIS.

As time in seconds increases, distance in kilometers increases.

EXPLAIN WHY SOME OBJECTS SINK AND OTHERS FLOAT IN

WATER.

Objects with a density lower than that of water (1 g/cm3)will float, while objects with a density greater than that of water will sink.

DEFINE:MELTING,

FREEZING, EVAPORATION, SUBLIMATION,

CONDENSATION, DEPOSITION

MELTING: SOLID TO LIQUIDFREEZING: LIQUID TO SOLID EVAPORATION: LIQUID TO GAS SUBLIMATION: SOLID TO GASCONDENSATION: GAS TO LIQUID DEPOSITION: GAS TO SOLID

WHAT IS THE DIFFERENCE BETWEEN

A CHEMICAL AND A PHYSICAL CHANGE?

GIVE AN EXAMPLE OF EACH.

In a chemical change a NEW substance is produced,. For example: burning wood, rusting metal.

In a physical change the substance may change but chemically remains the same. Example: Crumbling paper, or ice melting.

DESCRIBE 3 WAYS IN WHICH AN EXPERIMENT CAN BE IMPROVED.

YOU CAN IMPROVE AN EXPERIMENT BY DOING ONE OF THE FOLLOWING:

1.Increase the sample size.2.Increase the number of

trials. 3.Control more variable,

making sure that ONLY one variable is being changed or manipulated.

CONTRAST THE MOTION OF PARTICLES

IN:A SOLID, LIQUID,

AND IN A GAS.

Gas: Particles are far apart and move very fast.

Solid: Particles are close together and vibrate, moving much slower than in a gas.

Liquid: molecules slide pass each other moving at a speed in between that of a gas and a solid.