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10
×
How many protons does sulfur have?
Sulfur's atomic number is 16, so it has 16 protons
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10
×
How many valence electrons does oxygen have?
Oxygen (O) is in group 16, so it has 6 valence electrons
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15
×
Metal alloys are... elements, compounds, homogenous mixtures, or heterogenous mixtures?
Homogeneous mixtures. The metals are not bonded together
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15
×
What did JJ Thompson discover?
The electron, using the cathode ray tube experiment
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15
×
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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banana
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gift
Win 10 points!
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gift
Win 15 points!
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banana
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15
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Who discovered that elements always combine in the same ratios (the Law of Constant Composition)?
John Dalton
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15
×
What is the most common/stable ion of magnesium?
Mg2+
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15
×
What did the gold foil experiment prove?
Atoms are mostly empty space, with a small, dense, positively-charged center
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25
×
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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15
×
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.
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heart
Other team wins 25 points!
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shark
Other team loses 20 points!
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rocket
Go to first place!
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baam
Lose 25 points!
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eraser
Reset score!
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rocket
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rocket
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banana
Go to last place!
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15
×
Which two subatomic particles have an approximately equal mass?
Protons and neutrons weigh about 1 amu
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15
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What is the most common isotope of silicon?
Silicon-28
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10
×
What is matter?
Anything that has mass and volume
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