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