Units
What is the standard unit of mass?
kilograms (grams)
Name three elements.
Hydrogen, oxygen, carbon, iron, etc.
Melting is a type of ______ change.
Physical
This kind of educated guess is written as an "If/Then" statement.
Hypothesis
This is a pure substance that is made up of two or more types of atoms.
Compound
What is the standard unit of volume of a liquid?
milliliters (liters)
Name a compound other than water.
Sugar, salt, caffeine, etc.
Catching on fire is an example of a _______ change.
Chemical
This part of the experiment is left unchanged, so that the other variables can be compared to it.
The control
Heterogeneous mixtures are characterized by having distinct ________.
Parts OR layers
1g/mL of water is the same as ...
1g/cm3 of water
Give two examples of solutions.
Soda, coffee, tea, sugar water, etc
A molecule that easily undergoes chemical changes is said to be highly ________.
Reactive
This is the variable that changes in response to changes in the independent variable.
Dependent variable
This is a liquid/gas form of a homogeneous mixture.
Solution
What are the units for density?
g/mL or g/cm3
Give an example of a heterogeneous mixture.
Lucky charms, pennies, trail mix, mixed nuts, etc.
List three examples of physical properties of matter:
Viscosity, density, mass, volume, malleability, conductivity, boiling point, freezing point, hardness.
This is the variable that the experimenter controls.
Independent Variable
Steel, salt water, soda, cement, and coffee are all examples of __________.
Homogeneous mixtures
How many millimeters are in one meter?
1000
Explain why some beverages (e.g. oatmilk) need to be shaken before serving. Use vocabulary terms to define the liquid before and after shaking.
Oatmilk is a suspension. We need to shake it up to make it homogeneous before drinking. Over time, it will become a suspension again.
What is an oxidizing flame, and why is it bad?
Oxidizing flames release oxygen while they burn, which further feeds the fire.
This is a strongly supported explanation for some aspect of the natural world that incorporates facts, hypotheses, laws, and experimental data.
Theory
When milk curdles, it goes from a ________ mixture to a __________ mixture.
From a homogeneous to a heterogeneous mixture