Calculate the relative formula mass of calcium carbonate, CaCO3. (relative atomic masses: C = 12, O = 16, Ca = 40)
100 (amu or g/mol)
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15
An atom of element X has an atomic number of 119 and a mass number of 319. How many neutrons does it have?
200
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15
Place the following pH values in order of increasing acidity: 4,1,7, 12, 6
12<7<6<4<1
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20
How many electrons are there in a chloride ion (Cl-)?
18
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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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25
Throughout the experiment the volume of hydrogen and the volume of oxygen are measured at two-minute intervals. Describe what the results show about the volumes of hydrogen and of oxygen produced in this experiment.
A description to include âĒ volumes going up: (oxygen/ hydrogen/ gas) increase (with time) / volume (directly) proportional to time (1) âĒ quantitative comparing
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10
What is the electron configuration of nitrogen (atomic #7)
2.5
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15
An atom of element X has an atomic number of 119 and a mass number of 319. How many electrons does it have?
119
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25
Explain why the pH of a hydrochloric acid increases when pure water is added
the pH increases as the water dilutes the acid. This is because hydrogen ions are less concentrated
