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Unit 1 Review: Matter, Atoms, and the Periodic T ...
Game Code: 1229100
English
22
Public
Atoms, Elements, Compounds, Mixtures, Physical and Chemical Changes, Isotopes, Reading the Periodic Table, Properties of Families
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How many energy levels does phosphorus have?
Phosphorous (P) is in period 3, so it has 3 energy levels
10
How many valence electrons does oxygen have?
Oxygen (O) is in group 16, so it has 6 valence electrons
10
How many protons does sulfur have?
Sulfur's atomic number is 16, so it has 16 protons
10
How many electrons does a neutral atom of calcium have?
Calcium's atomic number is 20, so it has 20 protons. A neutral atom has the same number of protons and electrons, so 20.
15
Why does argon not react with other elements?
Ar is a noble gas. Noble gasses have a full valence shell, so they are energetically stable
20
Which family of elements is most electrically conductive?
Metals
15
Which element is brittle at room temp: Potassium, Calcium, Sulfur, Gold, Aluminum
Sulfur, because it is a nonmetal. We saw this in the metals, nonmetals, metalloids lab.
15
What is another name for a homogenous mixture?
A solution
10
Metal alloys are... elements, compounds, homogenous mixtures, or heterogenous mixtures?
Homogeneous mixtures. The metals are not bonded together
15
Which two subatomic particles have an approximately equal mass?
Protons and neutrons weigh about 1 amu
15
Draw a particle diagram of a liquid solution
Solutions are homogeneous mixtures. Should have two compounds/elements. Molecules flow but at bottom of container.
25
In a physical change, what happens to the organization of the atoms?
Structure of the element or compound stays the same.
15
In a chemical change, what happens to the organization of the atoms?
Chemical bonds between atoms are broken and new bonds form. Atoms rearrange.
15
Which is a chemical change: boiling water, mix dye + water, rust, paint chipping
Rust is a chemical change. The color changes and you need a chemical process to reverse it.
15
Which is a chemical change: chopping wood, leaves changing color, increasing temp of solution, distilling gasoline
Leaves changing color. The chlorophyll molecules break down into component elements.
15
List 3 signs of a chemical change
Heat, light, color change (usually), bubbles, new substance
20
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