CHEM 1510 Lecture Notes - Lecture 5: Alkali Metal, Radioactive Decay, Unified Atomic Mass Unit

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purplearmadillo874

17 Aug 2016

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Element- the simplest type of substance with unique physical and chemical properties. An element consists of only one type of atom. It cannot be broken down into any simpler substances by physical or chemical means. Molecule- two or more atoms that are chemically bound and behaves as a unit. Compound- two or more elements which are chemically combined. Mixture- a group of two or more substances that are physically intermingled and can vary by mass. A physical mixture of fe and s8 can be separated by using a magnet. Fe and s have chemically reacted to form the compound fes. The elements cannot be separated by physical means. A heterogeneous mixture has one or more visible boundaries, between the components. Sand in water, salt and sugar, oil and water. A homogeneous mixture has no visible boundaries because the components are mixed as individual atoms, ions, and molecules. A homogeneous mixture can also be called a solution.

Related Questions

Which of the following is true of a compound?

A compound must be solid at room temperature
A compound is a substance that cannot be separated into simpler substances by chemical means
A compound is a combination of two or more substances in which the substances retain their distinct identities
A compound is a substance composed of atoms of two or more elements chemically united in a fixed ratio
A compound must be heterogeneous

apricotporcupine890

Indicate whether the following samples of matter is a heterogeneous mixture, a homogeneous mixture, a compound, or an element.

a. a blue-colored, single-phase liquid that when boiled away (evaporated) leaves behind a solid residue

b. a "cloudy" liquid that separates into two layers upon standing overnight

c. a non-uniform, white crystalline substance, part of which dissolved in alcohol and part of which does not dissolve in alcohol

d. a colorless gas that cannot be separated into simpler substances using physical means and that reacts with metal magnesium to produce both magnesium-oxygen compound and a magnesium-nitrogen compound

ceruleanclam950

1) Classify each of the following as a mixture, a compound, or an element?

table sugar, propane, bronze, tea, vinegar, dry ice, oxygen, aluminum

2) Select the statements that pertain to elements. Select all the statements that apply.
a) These can be broken down by physical means.
b) These cannot be broken down by chemical means.
c) These combine chemically to form new substances; they are building blocks of matter.
d) These are chemical combinations of simpler forms of matter.
e) These are pure substances.

3) Which of the following are chemical changes? Check all that apply.
a) sugar is dissolved in water
b) a warm coke bottle fizzes when opened
c) the copper roof turns green over time
d) baking soda is dissolved in vinegar and bubbles appear
e) a fog appears on your windshield in cold weather

4) Classify each property as physical or chemical.

a)susceptibility to rust

b) flammability

c) boiling point

d) melting point

e) conductivity

f) color

5) Which of these substances are elements? Check all that apply.

a) silicon

b) iodine

c) lead

d) quartz

e) silicone

f) water

CHEM 1510 Lecture Notes - Lecture 5: Alkali Metal, Radioactive Decay, Unified Atomic Mass Unit

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