Chemistry (fill in blank and essay)
What is the mass number of an atom
Total number of protons and neutrons that make up the nucleus of an isotope
Gravel is an example of a __ mixture
Heterozygous
An alloy such as a gold ring is an example of a ___ mixture
Homozygous
What is an isotope
Atoms of the same element that have different masses
A team of scientists is working to discover now an enzyme affects blood cells in sheep. They are working in the field of _____ chemistry
Biochemistry
An apple turning brown after being cut is an example of a ___ change.
Chemical
Any substance with a definite composition is a ___
Chemical
Iron and sulfur, when heated, form an iron sulfide that has different properties from either iron or sulfur, the formation of iron sulfide is an example of a ___ change
Chemical
Some iron and sulfide are mixed together, then heated. When the result is cooled, the iron can no longer be seperated from the sulfur with a magnet. The result of heating the mixture was a formation of a ___
Chemical
Matter that has neither a definite volume nor a definite shape is in the ___ state
Gaseous
A chemistry student is studying the formation of quartz crystals. She is studying ___ chemistry.
Inorganic
Basic research is performed to increase ___
Knowledge
A sample of matter can be poured from container to container. Pit takes the shape of its container but only takes up a certain volume. Based on this information, the sample is on the ___ state
Liquid
What is the law of conservation of mass
Mass is neither created nor destroyed during ordinary chemical or physical change
What is the atomic number of an atom
Number of protons of each atom of that element
The melting of butter is a ___ change because it does not produce any new substance
Physical
When examining a mineral, hardness and color are two of the properties used for identification. Hardness and colors are examples of ___ properties
Physical
Distinguish between precision and accuracy
Presidio is the closeness of a set of measurements of the same quantity while acuracg is the closeness of a measurement to the correct value
Applied research is often performed to find the answer to a particular ___
Problem
In a bonfire, oxygen allows wood to combust, leaving behind ashes. In this process, oxygen and wood are the reactants, and ashes are the ___
Products
What do quantum numbers describe
Specify the properties of atomic orbitals and the properties of am electrons in orbitals