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Chemistry SED > Topic 2 Chemical Calculations > Flashcards

Topic 2 Chemical Calculations Flashcards

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1
Q

What are reactants in a chemical reaction?

A

Substances that REACT together.

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2
Q

What are products in a chemical reaction?

A

Substances PRODUCED in the reaction.

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3
Q

What does a word equation represent?

A

The names of the substances involved in a reaction.

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4
Q

What is an acid-base reaction often called?

A

Neutralisation reaction.

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5
Q

What do balanced equations provide?

A

Symbols and formulas of the substances involved in a reaction.

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6
Q

What is the first step in balancing chemical equations?

A

Write the formulae for each substance.

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7
Q

What is RAM (Relative Atomic Mass)?

A

The average mass of a large number of atoms of an element.

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8
Q

What does RMM (Relative Molecular Mass) represent?

A

The average mass of a molecule calculated by adding the RAMs of all the atoms in the formula.

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9
Q

What is the definition of a mole (mol)?

A

The amount of a substance that contains as many particles as there are atoms in 12g of carbon-12.

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10
Q

What is Avogadro’s constant?

A

6.022 x 10^23 particles per mole.

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11
Q

What is molar mass?

A

The mass of one mole of any substance, measured in g mol^-1.

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12
Q

How is molarity defined?

A

The number of moles of substance in 1 L of solution.

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13
Q

What is the unit of molarity?

A

mol L^-1 or M.

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14
Q

What is a solvent?

A

The liquid in which the solution is formed.

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15
Q

What is a solute?

A

The substance dissolved in the solvent.

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16
Q

Fill in the blank: An acid reacts with a metal hydroxide to produce a _______ and water.

A

salt

17
Q

True or False: The mass of one mole of any substance is numerically equal to its relative molecular mass.

A

True

18
Q

What does ppm stand for?

A

Parts per million.

19
Q

How do you calculate the concentration of a solution in ppm?

A

mg per litre or mg per kg.

20
Q

What happens in a solution when a solute is dissolved in a solvent?

A

A homogeneous mixture is formed.

21
Q

What is the molarity of 1 mole of NaCl in 1 litre of water?

A

1 M.

22
Q

Calculate the mass of 0.5 moles of hydrochloric acid (HCl).

A

18.25 g.

23
Q

What is the balanced equation for the reaction between potassium hydroxide and hydrochloric acid?

A

KOH + HCl → KCl + H2O.

24
Q

How many moles of SO2 are there in 16.0 g of sulphur dioxide gas?

A

0.25 moles.

25
Q

What is the balanced equation for the reaction of calcium and water?

A

Ca + 2 H2O → Ca(OH)2 + H2.

26
Q

What is the molarity of 0.5 moles of NaCl in 200 mL of water?

A

2.5 M.

27
Q

How do you find the concentration of HCl neutralized by NaOH?

A

Use stoichiometry based on the balanced equation.

Chemistry SED (5 decks)

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