Physical science- test 1

What two broad areas of science are covered in Physical Science?

Physics, chemistry

Definition of Physics

The science of the way nature behaves

Definition of chemistry

the science of matter, and what things are made of

Definition of bias

To favor one thing over another

What is science?

A process that results in reproducibility and predictability

Give example of predictability

I know that if i turn my steering wheel, i know my car will turn

Give example of reproducibility

If I take the same medicine every day, ill get the same outcome

What is the scientific method?

A system used to test theories, to not be bias. Created by Galileo created the scientific method . Before people would say just “i think” and only have theories

List the steps of the scientific method

1. Question

2. Research/observation

3. Multiple hypotheses

4. Experiment/test

5. Analyze Data

6. Conclusion

Why do we say “multiple hypotheses” in the scientific method?

To avoid being bias

How do you distinguish between the independent and dependent variable?

The dependent variable is what the scientist is trying to find out, and the independent variable is the other one, and is controlled by the scientist

One chicken is injected with a growth hormone while another chicken is not injected. Both chickens are weighed after a year. Find the independent and dependent variable

Independent: growth hormone

Dependent: weight of chicken

One plant is given sunlight for 12 hours a day. Another plant is not given any sunlight. After 3 weeks, we compare how green each plant looks. Find the independent and dependent variable.

Independent: amount of sunlight given

Dependent: how green the plants look

What is the value of standardized units in science?

Measurements first were different around the world, but trade changed and started going in between other countries rather than in just one small town. They had to agree on the same units so there was no confusion.

*What is a standardized units?

They are universal and have to be consistent

Why is the metric system also called the SI system?

SI stands for System International. The French scientists at the time came up with the SI system.

What is the metric system based on?

Tens/multiple of tens

What are the basic metric units for time and temperature?

Time- seconds(secs), Temp.-Celsius, sometimes Kelvin when dealing with very cold temperatures

What are the basic metric units for length, volume, and mass?

Length- centimeters(cm),meters (m), Volume- ml, cm cubed, m cubed, Liters(l), Mass- grams(gms) or kilograms(kgms)

Convert 314mg =______________g

O.314g

Convert 4L =_____________mL

4,000mL

What is "tare"?

The weight of an empty container

What is water's density?

1

Find the density of a cube with side measurements of 8cm and a mass of 1536g.

Density = 3cm cubed/ grams

What are the 5 standardized measurements used to describe the physical world?

Volume, mass, length, temperature, and time