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WorksheetsUnit 6 Review
Total questions: 21
Worksheet time: 25mins
The Law of Conservation of matter states that the total amount of matter ______________ after it undergoes change.
disappears
stays the same
weighs less
explodes
(a) can be neither created nor destroyed.
Which type of reaction is:
2 H3AsO4 → As2O5 + 3 H2O
Which type of reaction is:
2 NH3 + H2SO4 → (NH4)2SO4
Which type of reaction is:
2 K + MgBr2 → 2 KBr + Mg
The two sides of a chemical equation are called?
Reactants (left) and Products (right)
Ingredients (left) and Product (right)
Cations and Anions
Reactants (left) and Results (right)
Coefficients in chemical formulas...
Multiply just the first atom
Add to the subscripts at the end of the molecule
Multiply elements without subscripts
Multiply EVERYTHING!
Al + O2 → 2Al2O3
Which number is needed to balance the following equation?
2K + MgBr2 ⟶ …KBr + Mg
3
1
2
4
Which number is needed to balance the following equation?
2Na + 2H2O ⟶ 2NaOH +…H2
2
1
3
4
True or false:
In any physical change or chemical reaction, mass is conserved.
True
False
N2O4
LiBr is called
lithium bromine
lithium (I) bromine
lithium bromide
lithuim (I) bromide
Which of these combinations is an ionic compound made of?
Metal and Metal
Nonmetal and Nonmetal
Metal and Nonmetal
Cation and Cation
Name the following ionic compound: BeCl2
beryllium chlorine
beryllium II chloride
beryllium chloride
beryllium dichloride
If I gain electrons I become
Positive because I've added to my atom
negative because I've added electrons
same because i'm balanced
equal because now I have electrons
