Measurements & Density
If a scientist repeats his experiment 5 times and all measurements are similar, his work is called
What is precise?
Fog is this type of mixture
What is a colloid (also "heterogenous")
Two groups of pure substances
What are elements and compounds
Rusting iron
What is a chemical change
An example of a qualitative observation
(answers will vary but should not include numbers. For example, the plant leaves turned yellowiish)
Substance(s) that will float on all others: Cold oil, Hot oil, Cold water, Hot water
Cold Oil
2 terms describing mixtures such as pulpy orange juice
What is heterogeneous mixture;suspension
Simplest form of elements on Earth
What is an atom
Term for the variable that the scientist changes during an experiment
What is an independent variable
How many nanograms are in 2 Mg?
2 x 1015 ng
Type of mixture exhibiting the Tyndall effect
What is a colloid
3 classes of metals on the periodic table, from left to right.
What is metal, metalloid (or semi-metal) and nonmetal.
What is an intensive physical property
Study of the chemical processes and substances of living organisms
What is biochemistry
Which of the following is/are not a standard SI unit (list all): gram, minute, candela, mol, liter, meter
What are gram, minute, and liter
Another term for homogeneous mixture
What is a solution
Atomic symbol for potassium
What is K
Four signs of a chemical change
What is release of heat/light; color change; formation of a precipitate, production of a gas
Definition of matter
What is has mass and has volume
Density = mass/volume
Process that separates out a solid from a liquid.
What is filtration
Atomic symbol for boron
What is B
Phase changes
What are physical changes
3 terms to describe matter such as salt
Compound, pure substance, homogenous