chemistry

What does a molecule mean?

a combination of two or more atoms. Molecules cannot be separated by physical means

Give examples of compound?

water, salt, sugar

What does a compound mean?

A combination of two or more atoms of different elements in a precise proportion by mass. In a compound, the atoms are held together by attractive forces called chemical bonds and cannot be separated by physical means.

What is an Element mean?

A substance that contains one type of atom and cannot be broken down by simple means

What is the difference between molecules and compounds?

A molecule is when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds

A substance that contains one type of atom and cannot be broken down by simple means

Element

What mixture are all the components visibles because the components do not mix together?

Heterogeneous mixture

What mixture are the particles not evenly distributed?

Heterogeneous mixture

Give examples of elements?

There are 118 known elements which include all are in the periodic table

Explain the difference between homogenous and heterogenous mixture?

There are two general types of mixtures: homogeneous and heterogeneous. Homogeneous mixtures are composed entirely of one phase (for instance, all liquid or all solid). A heterogeneous mixture is composed to mixed phases (such as a solid in a liquid, or a liquid and gas).

What does heterogeneous mixture mean?

a system of two or more substance that have distinct chemical and physical properties. Examples include mixtures of salt and sand, oil and water, crackerjacks and dirt or vegetable soup, or sand and water .

What does homogeneous mixture mean?

a system of two or more substances that are interspersed . The individual substances have distinct chemical properties and can be separated by physical means. the components that make up the mixture are uniformly distributed throughout the mixture. for example such as the gases making up the air or salt dissolved in water examples air, blood, saturated sugar water

matter

anything that has mass and takes up space

matter

anything that occupies space and has mass

Give examples of Heterogeneous Mixtures

can be easily separated sandy water carbonated beverage beer (the CO2 gas is mixed with the liquid) water with ice cubes in it chicken noodle soup is a mixture where the components of the mixture are not uniform or have localized regions with different properties. Heterogeneous mixtures: rocks, oil and water,

Give examples of homogeneous Mixtures:

it is the same throughout and can be evenly mixed Salt water. brewed tea or coffee soapy water a dilute solution of hydrochloric acid hard alcohol wine

mass is always conserved the total mass of chemical change remains the same.

law

why are atoms electrically neutral?

made of an equal number of protons and electrons

why are compounds not molecules?

molecules can be made up of an element consists of two identical atoms it is called DIATOMIC molecule but compounds are made up of different elements and can not be made up of identical elements or atoms

Atoms are electrically

neutral

An atom is composed

nucleus (which contains one or more protons and neutrons) and electrons in motion around it.

What does an Atom mean?

the basic unit of an element that retains (keeps) all the elements chemical properties.