ES Ch 2 Review

Multiple Choice

In a controlled experiment . . .

• all variables are constant except the one you are testing

• more than one variable can be tested at a time

• data is not collected

• the hypothesis is always supported

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The focus of ​​

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is to study how nature works and to use what is learned to predict what may happen in nature.

​   ​

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, or practices, enable scientists to advance knowledge and understanding of how the world works.

​ ​

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  : well-tested and widely accepted explanation

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science

Scientific methods

Scientific theory

Match

Match the following

• testable answers to scientific questions

• data or information

• representations of systems

Hypothesis

Measurements

Models

• Hypothesis

• Measurements

• Models

Multiple Choice

A scientific hypothesis must be testable.

• True

• False

Dropdown

​

Select answer

is made of more than one type of atom.

​ ​

Select answer

is only made from one type of atom.

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​

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are made of two or more ​

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held together in ​

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proportions

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compounds

elements

fixed

changing

Labelling

Label the subatomic particles on the atom.

Drag labels to their correct position on the image

crouton

neutron

electron

proton

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A ​

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change results in a new substance.



A ​

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change does not result in a new substance.

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chemical

physical

Multiple Choice

One of two or more forms of a chemical element that have the same atomic number but different mass numbers because they have different numbers of neutrons in their nuclei.

• Molecule

• Isotope

• Compound

• Ion

Multiple Choice

Numeric value that indicates the relative acidity or alkalinity of a substance on a scale of 0 to 14, with the neutral point at 7.

• chemical change

• physical change

• pH

• Ion

Match

Match the following

• Kinetic Energy

• Thermal Energy

• Electromagnetic Radiation

• Potential Energy

Energy of Motion

Energy from Motion of Particles

Wave Energy

Stored Energy

• Energy of Motion

• Energy from Motion of Particles

• Wave Energy

• Stored Energy

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​

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wavelengths, like gamma rays, have ​

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energy

​

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wavelengths, like radio waves, have ​

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energy

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shorter

more

longer

less

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Law of conservation of ​

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: Whenever energy is ​

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from one form to another in a physical or ​

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change, no energy is created or ​

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.

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converted

chemical

destroyed

energy

Multiple Choice

Aria, Michael, and Ethan are having a debate. Aria thinks that in an efficient physical change, more energy comes out than goes in. Michael and Ethan are not sure. Who do you agree with?

• I agree with Aria (True)

• I disagree with Aria (False)

Multiple Choice

An example of potential energy is ____.

• a bullet fired at high velocity

• the flowing of water

• a leaf blowing in the wind a tree

• electricity flowing through a wire

• the chemical energy in a candy bar

Multiple Choice

Which has the LONGEST wavelength and, therefore, the lowest frequency/energy

• Gamma Rays
• Radio Waves
• Visible Light
• Infrared rays

Multiple Choice

Which has the SHORTEST wavelength and, therefore, the highest frequency/most energy

• Radio waves
• Ultraviolet Rays
• Gamma Rays
• X-rays

Multiple Choice

System thinking can help in problem solving by...

• breaking up the problem into small manageable steps

• looking at a problem as a small part of a larger system

• solving problems in a systematic way, like the scientific method

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​

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feedback loops can cause a system to ​

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into a(n) ​

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by continuing to change in the same direction.

​

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​feedback loops can cause a system to ​

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by changing in the opposite direction.

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Positive

spiral out of control

Negative

self-correct

ecological tipping point