Some metal objects are electroplated. State two reasons for electroplating a metal object.
Any two âĒ improves the appearance/ shiny (1) âĒ improves resistance to corrosion/ does not corrode/ prevents reaction with prevents oxi; Any two from: âĒ improve
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5
Is chlorine an alkali metal, alkaline Earth metal, halogen or noble gas?
halogen
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5
the horizontal lines on the periodic table are called
periods
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15
) 8.000 g of CaCO3 was heated strongly for about 10 minutes. 6.213 g of solid remained. Calculate the mass of carbon dioxide gas given off.
8.000- 6.213 = (1.787) (g)
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15
Write the formula for magnesium phosphide
Mg3P2
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10
Which of the following is NOT a diatomic molecule? hydrogen, bromine, phophorous, nitrogen or
phosphorous
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25
What is the name of this compound?
sodium dihydrogen phosphate monohydrate
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20
Definition of catalyst: a substance that speeds up a reaction without altering the ________(a) and is unchanged _______(b)
(a) products (b) chemically
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heart
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magnet
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fairy
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banana
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15
Rauda wants to separate 2 liquids. Liquid A has a boiling point of 65C and liquid B has a boiling poit of 95C. She sets up a fractional distillation. Which liquid is collected first?
Liquid A, because it has the lower boiling point, it comes out first.
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10
What is the electron configuration of nitrogen (atomic #7)
2.5
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rocket
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shark
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baam
Lose 15 points!
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boom
Lose 50 points!
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gold
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shark
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lifesaver
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5
Generally, what is the ionic charge on group 6 ions?