Chemistry Safety and Sciene TEST

What is physics

"knowledge of nature" study of matter and motion, study of force and energy

You have just finished using the hotplate when the bell rings

clean up everything including the hotplate's power cord and ask the teacher if you can leave the still hot hotplate

A good way to work with your lab partner while writing up the lab is

work on the questions and calculations together. If you can't figure a question out ask your teacher.

For a scientist a fact is ____________.

something that is observable

In the equation for pressure P= f/a force is_____________ the area.

directly proportional

What is the mathematical relationship between velocity of a falling object and time?

linear growth

What is the mathematical relationship between the distance an object falls and time?

quadratic growth

The graph below shows that pressure is ___________ the volume of a sample of gas.

inversely proportional to

When testing the efficacy of a medication some patients are given the medication, but other patients are given a pill that doesn't contain any medication. The patients without the medication are called the ___________.

control group

What is a model

an imitation of complexities of the real system, developed from what we know and are tested for how they can predict a system

How are models used in science

to show how atoms/ molecules look, explain how atoms connect/ react, make tiny/ invisible things easy to understand

three reasons why the non-luminous flame is preferred

1) easier to control/ cleaner

2) It is easier to find the hottest point with copper wire it turns green, orange, and black when you take it out

3) Uses reverse process, it can undo what the luminous flame does to the dish, at first it is covered in soot then turns white/light color

In the Bunsen Burner lab what causes the formation of the soot in the luminous flame?

There is a restricted amount of oxygen, and it prevents the gas to not burn fully, U CANNOT COMPLETE COMBUSTION formation of the soot comes from unburnt carbon

Why does the soot disappear in the non-luminous flame?

flame provides enough oxygen for complete combustion, it fully burns all the carbon allowing the soot to disappear

What is scientific method

a problem solving method based on repeatable facts and logic

What is theory

an explanation stood by facts can predict future events bc its well tested

What is hypothesis

PROPOSED explanation of something, it is an idea. Almost all hypotheses change as new facts emerge

What is law

Describes what always happens in nature

What is an experiment

something to test your hypothesis

Control

the part of the experiment that stays the same

What is a dependent variable?

variable that is measured

What is an independent variable

variable that is manipulated

inversely proportional

one thing big, one small (opposites)

directly proportional

one big, other big

relationship of pressure to area

inversely

pressure to force

directly

force and area

directly

numerator is almost always

direct

denominator is almost always

inversely

Quadratic Growth

curve up and increase bigger each time

inverse growth

curve down

distance equals

time squared

sun is doing

e=mc2 sun converts mass to energy