Sig Figs
The number of significant figures in the measurement 0.004560.
What is four?
The SI unit used to measure mass.
What is the kilogram?
A mixture that has the same composition throughout.
What is a homogeneous mixture?
The ability of iron to rust is an example of this type of property.
What is a chemical property?
This scientist proposed the atomic theory.
Who is John Dalton?
The number of protons in an atom of an element is represented by this number on the periodic table.
What is the atomic number?
The process of splitting a heavy nucleus into smaller parts.
What is fission?
The term for the time it takes for half of a radioactive sample to decay.
What is a half-life?
How many significant figures are in the measurement 120.00?
What is five?
The term for how close a measurement is to the true value.
What is accuracy?
A substance that cannot be broken down into simpler substances.
What is an element?
Ice melting is an example of this type of change.
What is a physical change?
The particle found in the nucleus with a positive charge.
What is a proton?
The total number of protons and neutrons in the nucleus of an atom.
What is the mass number?
The type of nuclear reaction that powers the sun.
What is fusion?
A sample of a radioactive isotope has a half-life of 10 years. If you start with 80 grams, how much remains after 20 years?
What is 20 grams?
Round 0.009876 to three significant figures.
What is 0.00988?
Convert 5000 milliliters to liters.
What is 5 liters?
The two categories used to classify mixtures.
What are homogeneous and heterogeneous?
The process of cooking an egg is an example of this type of change.
What is a chemical change?
The current model of the atom.
What is the quantum mechanical model?
This number represents the weighted average mass of all isotopes of an element.
What is the atomic mass?
his process, which powers the sun, combines hydrogen nuclei to form helium and releases energy.
What is nuclear fusion?
If 25% of a radioactive sample remains after 12 hours, what is the half-life of the sample?
What is 6 hours?
How many significant figures are in the number 1200?
What is two significant figures?
The number of grams in 2.5 kilograms.
What is 2500 grams?
Is saltwater a pure substance or a mixture, and what type?
What is a homogeneous mixture?
Existence of color change, gas production, or heat/light emission.
What is chemical change?
The atomic model that describes electrons orbiting the nucleus in fixed energy levels.
What is the Bohr model?
The periodic table is arranged by increasing what property of elements?
What is atomic number?
The byproduct of nuclear fission used in power plants.
What is radioactive waste?
The radioactive isotope iodine-131 has a half-life of 8 days. How many days will it take for a 100 g sample to decay to 12.5 g?
What is 24 days?
How many significant figures are in the number 0.08900?
What is four significant figures?
The number of neutrons in an isotope of carbon-14.
What is eight?
The fuel commonly used in nuclear power plants.
What is uranium-235?
The fraction of a radioactive sample that remains after three half-lives.
What is 1/8?