chemical formulas and equations test review h2oh2o2h 2 + o 2 2h 2 o
DESCRIPTION
Which is not a molecule? Na Na is just an element (1 atom). Molecules have 2 or more atoms. H₂O NaCl Na Na₂TRANSCRIPT
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Chemical Formulas and Equations
Test Review
H2O 2H2 + O2 2H2O
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Which is an example of a compound?
NaCL A compound has…..
2 or more atoms AND they need to be different.
Na2NaNaClNa₂
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Which is not a molecule?
Na Na is just an element (1 atom).
Molecules have 2 or more atoms.
H₂ONaClNaNa₂
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How many atoms are in Na₂SO₄?
7
Na = 2S = 1O = 4
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How many atoms are in C6H12O6?
24
Na = 6S = 12O = 6
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Which is an example of a element?
O O is just an element (1 atom).
H₂OSO₄C₆H12O₆
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A molecule has 3 atoms of hydrogen (H)
and 2 atoms of sulfur (S), what’s the formula?
H₃S₂
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Four molecules of 2 atoms of hydrogen (H) and
2 atoms of oxygen (O), what’s the formula?
4H₂O₂
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How many atoms are in 2CaCl₂?
6
Ca = 2Cl = 4
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What’s the ratio of calcium (Ca) to chlorine (Cl) in CaCl₂?
1 to 2
Ca = 1 Cl = 2
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What’s the ratio of oxygen(O) to hydrogen (H) in H₂O?
1 to 2
O = 1 H = 2
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What’s the ratio of oxygen (O) to sulfur (S) in 2SO₄?
8 to 2
2S1O4
O = 8 S = 2
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What is the formula for the model below.
4H₂O₂
= Hydrogen = Oxygen
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The coefficient in 7H2CO3 tells that there is…
7 molecules of H2CO3
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The coefficient in 6LiNO3 tells that there is…
6 molecules of LiNO3
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What’s the ratio of lithium (Li) to oxygen (O) in 3LiNO3?
3 to 9
3Li1N1O₃
Li = 3 O = 9
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What’s the coefficient of 4MgCl₂?
4The coefficient is the big number in front of the
chemical formula.
It tells the number of molecules there are.
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What is the subscript(s) of 4MgCl₂?
2The subscripts is the small number behind the chemical
symbol.
It tells the number of atoms there are for that element.
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What’s the ratio of hydrogen (H) to zinc (Zn) in 2ZnH₂?
4 to 2
2Zn1H2
H = 4 Zn = 2
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What is the subscript(s) of 7Ba₃P₂?
3 and 2The subscripts is the small number behind the chemical
symbol.
It tells the number of atoms there are for that element.
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What is the formula for the model below.
3FeH₃
= Iron (Fe) = Hydrogen (H)
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What does the subscript tell you?
The number of atoms of that element.
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What is the Law of Conservation of Mass?
Mass cannot be lost or gained OR
Mass cannot be created or destroyed.
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What are the product(s)?
2H2O2 → 2H2O + O2
The yield sign always points to the product.
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What are the product(s)?
3Ca + N2 → Ca3N2
The yield sign always points to the product.
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What are the reactant(s)?
2Li + F2 → 2LiF
The yield sign always points to the product.
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What are the reactant(s)?
Al2O3 4Al + 3O2
The yield sign always points to the product.
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What are the product(s)?
2NaOH + H2 2Na + 2H2O
The yield sign always points to the product.
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Does this chemical equation follow the Law of Conservation
of Mass?
Al + S → Al2S3 No1 = Al = 2 (Not Equal)
1 = S = 3 (Not Equal)
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Does this chemical equation follow the Law of Conservation
of Mass?
HgO → Hg + O2 No1 = Hg = 1 (Equal)1 = O = 2 (Not Equal)
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Does this chemical equation follow the Law of Conservation
of Mass?
2K + S → K2S Yes2 = K = 2 (Equal)1 = S = 1 (Equal)