chemistry

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mixtures can also be non-uniform (called ___)

heterogeneous

beach sand

heterogeneous mixture

salad dressing

heterogenous mixture

Is there a reaction between substances in mixtures?

no

Fine crystals of silver chloride are separated from a suspension of the crystals in water.

physical

Pure water freezes at 0°C.

physical

Salt substitute, potassium chloride, dissolves in water.

physical

Sugar crystals are separated from a sugar syrup by evaporation of water.

physical

The gas hydrogen sulfide smells like rotten eggs.

physical

iron filings are separated from sand by using a magnet

physical

a compound is always homogeneous

uniform

can mixtures be separated into their components by chemical or physical means?

yes

What does the metric prefix milli mean?

1/1000

What does the metric prefix kilo mean?

1000 time larger

Select the correct number of significant figures for 0.0230.

3

heterogeneous mixture

A heterogeneous mixture is a mixture where the components of the mixture are not uniform or have localized regions with different properties. Different samples from the mixture are not identical to each other.

substance

A solution is a homogeneous mixture of two or more substances.

over 100 existing elements are listed and classified on the

Periodic Table

solution

a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent.

The concept of ____ indicates how close the experimental answer is to the true value.

accuracy

pure substance containing only one kind of

atom

a pure substance containing 2 or more kinds of

atoms

an element _____ be separated into simpler materials (except during nuclear reactions)

cannot

compounds ____ be separated by physical means. Separating a compound requires a chemical change

cannot

Copper is produced when zinc metal is placed in a solution of copper(II) sulfate, a compound.

chemical

Fine steel wool (Fe) can be burned in air.

chemical

Seashells, calcium carbonate, fizz when immersed in vinegar.

chemical

Sodium metal is obtained from the substance sodium chloride.

chemical

the atoms are ____ combined in some way. Often (but not always) they come together to form groups of atoms called molecules

chemically

the properties of a mixture are similar to the properties of its ___

components

carbon dioxide

compound

magnesium oxide

compound

water

compound

mixture

different things mixed together

two or more ___ or ___ NOT chemically combined

elements, compounds

an element is always uniform all the way through

homogeneous

mixtures can be uniform (called ___) and are known as solutions

homogeneous

Classify the following as homogenous mixtures, heterogenous mixtures, elements or compounds.

homogeneous mixture

homogeneous mixture

homogeneous mixture is a mixture where the components that make up the mixture are uniformly distributed throughout the mixture. The composition of the mixture is the same throughout.

The concept of ____ indicates the ability of a person to measure consistently

precision

seawater

solution

fluorine

substance

sulfur

substance


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