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Cards (30)
What is the Avogadro constant?
02 × 10²³
molecules per mole
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How many grams are in one mole of iron?
56 grams
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What is the molar mass of oxygen gas (O₂)?
32 grams
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What is the molar mass of ammonia (NH₃)?
17 grams
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What is the formula to calculate the number of moles?
moles =
mass in g
/
Mr
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How do you write a balanced symbol equation for a reaction?
Calculate the
Mr
of all substances.
Divide mass by Mr to find
moles
.
Divide by the smallest number of moles.
Write the balanced equation.
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What is the Ar of iron (Fe)?
56
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What is the Ar of chlorine (Cl)?
35.5
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How many moles of iron are in 5.6g?
0.1 moles
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How many moles of chlorine are in 10.65g?
0.3 moles
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What is the ratio of moles of Fe to Cl in the reaction?
3
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What is the balanced symbol equation for the reaction of iron and chlorine?
2Fe
+
3Cl₂
→
2FeCl₃
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What is a limiting reactant?
Reactant used up first in a reaction
Stops the reaction from continuing
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How does halving a reactant affect product amount?
Halves the amount of product produced
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What does conservation of mass state in a chemical reaction?
Mass of reactants equals mass of products
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What is the word equation for magnesium reacting with oxygen?
Magnesium
+
Oxygen
→
Magnesium Oxide
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What is the balanced symbol equation for magnesium and oxygen reaction?
2Mg +
O₂
→ 2MgO
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What is concentration in terms of solutions?
Amount of
substance
in a specific volume
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What is the formula for calculating concentration?
concentration =
mass
÷ volume
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How do you calculate the mass of a dissolved substance?
mass =
concentration
×
volume
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How is mass conserved in a reaction?
Total mass of
reactants
equals total mass of
products
Example: 2Mg + O₂ → 2MgO
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What is the total mass of magnesium oxide produced from 6g of magnesium and 4g of oxygen?
10 grams
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What is the relative formula mass (Mr)?
Sum of all relative
atomic masses
in a formula
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How do you calculate the Mr of HCl?
Mr = 1 +
35.5
= 36.5
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What is the Mr of H₂SO₄?
98
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How do you find the percentage mass of an element in a compound?
percentage mass = (
Ar
× number of atoms) /
Mr
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What is the percentage mass of oxygen in magnesium oxide?
40%
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How can mass change during a reaction?
Mass can increase if a
gas
is added
Mass can decrease if a gas is
released
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What happens to mass when sodium carbonate decomposes?
Mass decreases due to
gas release
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What is the equation for sodium carbonate decomposition?
Sodium carbonate
→
Sodium oxide
+
Carbon dioxide
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