States of Matter
Solid, Liquid, Gas
What is the smallest unit of matter called?
Atom
What do plants need for photosynthesis to occur?
Sunlight, carbon dioxide and water
What causes a change in an objects motion?
Unbalanced forces acting on the object
What do we call the variable that is changed on purpose in an experiment?
Independent variable
Why do gases fill the shape and volume of their container?
Because their particles move freely and spread out to fill the container
What is the chemical formula for water?
H2O
What is the powerhouse of the cell?
Mitochondria
Name one everyday example where friction opposes motion and produces heat
What is the name of the variable that is measured or observed in an experiment?
Dependent variable
What is the process when water turns into a solid?
Freezing
What is a substance made of two or more elements that are chemically joined?
Compound
What part of the body pumps blood?
Heart
What term describes forces that act without touching, like gravity or magnetism?
Field
What do scientists write down to predict what will happen in an experiment?
Hypothesis
Name the change of state from gas to liquid
Condensation
What is the name of the chart that shows all of the elements?
Periodic Table
What part of the plant takes in water from the soil?
Roots
What is the difference between mass and weight?
Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.
Why is it important to have a control in an experiment?
To compare results and see if the independent variable caused the change
Steam is what state of matter?
Gas
What charge does a proton have?
Positive
True or False: The nucleus is found in both plant and animal cells
True
What are three ways heat energy can be transferred?
Conduction, convection and radiation
How do we improve reliability in an experiment?
By repeating the same test a few times