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eraser
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gift
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rocket
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baam
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10
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How many valence electrons does oxygen have?
Oxygen (O) is in group 16, so it has 6 valence electrons
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15
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Which family of elements is most electrically conductive?
Metals
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What is the most common isotope of silicon?
Silicon-28
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10
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What is another name for a homogenous mixture?
A solution
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How many energy levels does phosphorus have?
Phosphorous (P) is in period 3, so it has 3 energy levels
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What is matter?
Anything that has mass and volume
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Why does sulfur form an anion with a charge of 2- ?
Sulfur has 6 valence electrons, so it wants two more to fill its valence shell
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In a physical change, what happens to the organization of the atoms?
Structure of the element or compound stays the same. Spacing increases as energy of particles increases.
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25
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Draw a particle diagram of the sublimation of CO2
Compound should show two distinct atoms. Sublimation is solid --> gas. Solid is in orderly rows, gas takes up space
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20
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Explain why a state of matter change is a physical change
Physical changes result in a decrease, increase, or spread of molecules. For example, when ice melts into water, the H2O molecules do not change.
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rocket
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shark
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banana
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What is the most common/stable ion of chlorine?
Cl1-
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25
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Hydrogen has three isotopes. H-1 abundance: 99.98%. H-2: 0.012%. H-3: 0.008% Calcuate avg atomic mass.
To find: sum the mass of each isotope * it's abundance. (1)(0.9998) + (2)(0.00012) + (3)(0.00008) = 1.0002
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