Unit 1 Test Review

Unit 1 Test Review

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by Amber Salazar

​What topics will be on this test?

• ​​Scientific Method

  • ​Steps of the scientific method

  • ​Experiment variables

  • ​Theory vs Law

• ​States of Matter​

• ​Physical Properties

  ​Chemical Properties

  Mixtures and Pure Substances

What will my test be like?

• The Unit 1 test will be 25 multiple choice questions

• There will be 1 free response bonus question worth 5 points​

• ​The test will be taken on paper. No laptops or notebooks will be permitted on this test

Multiple Choice

When experimenting with the growth of a plant, a scientist uses three (of the same type of) plants, two different fertilizers, equal light, and equal water. What type of variable is the fertilizer?

• Dependent

• Independent

• Control

• Compound

Multiple Choice

The girl does not want to eat her vegetables.

• Observation

• Inference

Multiple Choice

Your teacher has asked you to explain the difference between quantitative and qualitative observations. Which statement is correct?

• Quantitative observations use numbers, qualitative uses the senses.

• Quantitative observations use the senses, qualitative uses numbers.

• Quantitative observations use measurement, qualitative uses numbers.

• Quantitative observations use colors, qualitative uses the senses.

Multiple Choice

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid: water, apple juice, or milk. What variables should be kept constant/controlled? 

• type of plant, flower pot,  soil, and amount of sunlight

• water, apple juice, milk

• only the amount of sunlight

• type of plant only

Multiple Choice

Before a scientific theory is accepted and supported, it has

• been tested by only one scientist.

• been published in scientific journals.

• been tested many times by different scientists.

• been approved by the International Committee of Scientists.

Multiple Choice

Scientific theories are based on

• general assumptions of how systems work.

• mathematical principles that can be proven true.

• large amounts of data collected over time.

• observations from within only one scientific discipline.

​Scientific Method

• ​Independent Variable: What is being changed

• ​Dependent Variable: The result of that change

• ​Constant: parts of the experiment that stay the same

• ​Control Group: Group that does not receive whatever is being investigated

• ​Theory: Explains WHY something happens, requires that it be repeatedly tested and verified through the scientific method

• ​Law: Explain WHAT is happening, requires that it be repeatedly tested and verfied through the scientific method

• ​Observation: what can be noticed with your 5 senses (qualitative & quantitative)

• ​Inference: A conclusion that can be drawn from observation

Multiple Choice

The type of matter with the lowest heat energy and temperature.

• gas

• solid

• liquid

• plasma

Multiple Choice

Which of the following describes liquids?

• definite shape, definite volume

• no definite shape, definite volume

• no definite shape, no definite volume

• no definite shape, no definite volume, electrically charged

Multiple Choice

How are plasma and gas different?

• Plasma has a definite shape, but gas does not.

• Gas is hotter than plasma.

• Electrons separate from atoms in plasma and plasma is hotter.

• Gas has a definite volume, but plasma does not.

Multiple Choice

Which state of matter?

• Solid

• Liquid

• Gas

• Texas

Multiple Choice

What happens to molecules when the temperature drops or lowers?

• The molecules get closer together

• The molecules start moving faster.

• The molecules stop moving.

• The molecules become smaller.

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Multiple Choice

A green powder is heated & a gas is given off while it turns to a black solid. This describes

• Physical Change

• Chemical Change

• Change in State

• Change in Temperature

Multiple Choice

The difference between a Physical change and a Chemical change is…

• Physical change is only a change to the outside appearance.

• Chemical change is when matter is changed into something new.

• Atoms are rearranged in chemical changes & not in physical.

• All are correct.

Multiple Choice

Identify what type of change happening in the picture below...

• Chemical Change

• Physical Change

• Endothermic Reaction

• Exothermic Reaction

Multiple Choice

Which type of change are irreversible?

• Chemical Changes

• Physical Changes

• Changes in State

• Changes in Temperature

Multiple Choice

Which characteristic of a substance is considered a chemical property?

• its boiling point

• its reactivity

• its density

• its conductivity

Multiple Choice

A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?

• heating it to find the temperature at which it melts

• exposing it to a flame to see if it catches on fire

• hitting it with a hammer to determine if it breaks or bends

• placing it in water to find out whether or not it dissolves

Multiple Choice

Which is an example of a chemical change?

• frying an egg

• boiling water

• melting butter

• chopping onions

Multiple Choice

Choose which one is a physical property

• Flammability

• Solubility

• Water Reaction

• Magic

​Signs of a Chemical Change

• ​Bubbles forming (except when boiling)

• ​Color changes

• ​Production of light

• ​Production of a precipitate

Multiple Choice

___________ are the smallest unit of an element that maintains the properties of that element.

• Atoms

• Elements

• Compounds

• Mixtures

Multiple Choice

A _____________ contains a variety of elements and compounds that are not chemically combined with each other.

• compound

• element

• molecule

• mixture

Multiple Choice

Which of these is an element?

• Salt (NaCl)

• Water (H20)

• Oxygen (O)

• Carbon Dioxide (CO2)

Multiple Choice

Which of these is a compound?

• Aluminium (Al)

• Carbon Dioxide (CO2)

• Nitrogen (N)

• Sand

Multiple Choice

What is this?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous Mixture

Multiple Choice

What is this?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous MIxture

Multiple Choice

What is this?

• Element

• Compound

• Homogeneous Mixture

• Heterogeneous MIxture

​Pure Substances vs Mixtures

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