Periodic Table
What do columns represent in the periodic table of elements?
groups, or families
Known as the study of the composition, structure, and properties of matter and the changes that matter undergoes
chemistry!!!
Name the three most common states of matter.
solid, liquid, and gas
Convert 0.35543 km into meters.
355.43 m
Are noble gases reactive?
No
(This is because they have full outer shells of valence electrons, which makes them reluctant to share electrons and participate in chemical reactions.)
What do rows represent in the periodic table of elements?
periods
a testable statement that serves as the basis for predictions and further experiments, and a theory is a broad generalization that explains a body of known facts or phenomena
hypothesis
made from two or more elements in fixed proportions
compounds
the ratio of mass to volume
density
a measure of the gravitational pull on matter
weight
What type of element is used to make lighted signs of various colors? (Hint: neon)
noble gases
Known as any substance that has a definite composition or is used or produced in a chemical process
chemical
a change in which the identity of a substance changes
chemical change
Arrange in the correct order the following four basic steps for finding the solution to a problem: check your work, analyze, solve, and plan
analyze, plan, solve, and check your work
A sample of a substance that has a density of 0.824 g/mL has a mass of 0.451 g. Calculate the volume of the sample.
0.547 mL
the type of element that is intermediate in properties between metals and nonmetals
metalloid
Name the two reactants in this equation.
potassium + water ->
potassium hydroxide + hydrogen
potassium + water
a change in which the identity of a substance is NOT changed
physical change
Write the following in standard notation.
7.050 × 103 g
7050 g
Suppose different parts of a sample material have different compositions. What can you conclude about the material?
The sample material is a heterogeneous mixture, since its parts were mentioned to have different composition.
Name two characteristics of non-metals.
Nonmetals tend to be brittle and tend to be poor conductors, while metals tend to be shiny, malleable, and ductile and tend to be good conductors.
defined as a mixture with a uniform composition and properties throughout, where all matter is in the same state
homogenous mixture
Describe the law of conservation of energy.
Energy may be released or absorbed, but it is neither created nor destroyed.
A metal sample has a mass of 45.65 g. The volume of the sample is 16.9 g/cm3. What is the density of the sample (density = g/cm3)?
2.70 g/cm3
What is meant by a mass measurement expressed in this form: 4.6 g ± 0.2 g?
It means that the mass was measured with a precision of 0.2 g. Thus, the mass measurement value of 4.6 g ± 0.2 g, describe the range of anywhere from 4.4 grams (4.6 - 0.2) to 4.8 grams (4.6 + 0.2).