WorksheetsLaw of Conservation of Matter
Total questions: 25
Worksheet time: 51mins
_N2 + _H2 --> _NH3
Which of the following are Subscripts in this Chemical Formula: 3Fe2O4
3,4
3,2
2,4
6
Which section represents the reactants?
A
B
C
Why does this picture demonstrate the Law of Conservation of Mass?
the number of atoms of each element are the same on both sides
they start out separate and end up combined
the same elements are used
it doesn't demonstrate the Law of Conservation of Mass
If a chemical reaction occurs in a closed system (no way for any part of the reaction to escape), how does the product mass compare to the reactant mass?
the mass would decrease
the mass would increase
the mass would stay the same
it depends on the type of reaction
If a chemical reaction occurs in an open system (not contained), what might happen to the measurable mass of the products when compared to the reactants?
the measurable mass might decrease because any gas produced can escape (the actual mass would stay the same)
the mass would increase because mass was created
the measurable mass would stay the same because nothing would be able to leave the system.
it depends on the type of reaction
Which picture below would correctly demonstrate the Law of Conservation of Matter if this picture is the reactants?
Which of the following chemical equations are balanced? (check all that apply)
2Mg + O2 --> 2MgO
2Al2O3 --> 4Al + 3O2
HgO --> 2Hg + O2
Na + Br2 --> 2NaBr
C + 2H2 --> CH4
In a reaction A + B ----> C.
Reactant A has 5g and product C has 9g.
How many grams does reactant B should have?
4g
5g
9g
14g
Fe + O2 -> Fe2O3
2C2H2 + 5O2 --> 4CO2 + 2H2O
_Al +_HCl --> _H2 +_AlCl3
Zn + H2S → ZnS + H2
In a chemical equation, is it true that -
the reactant side and product side can have different numbers of atoms for each element
there can be different elements on the reactant side and the product side
the reaction must always take place in a closed system in order for it to work
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
_Mg + _Cl2 --> _MgCl2
Which type of reaction is:
2 NH3 + H2SO4 → (NH4)2SO4
Which type of reaction is:
4 (NH4)3PO4 + 3 Pb(NO3)4 → 12 NH4NO3 + Pb3(PO4)4
The symbol (g) found beside a chemical formula indicates that the chemical is ___________________.
stable in composition
instable in composition
in the gaseous state
an organic sugar
Some chemical reactions require a substance called a catalyst. The purpose of a catalyst is
to warm up the reaction
to speed up the reaction
to create more reactants
to stop the reaction
Which of the following is a common sign that a chemical change has occurred?
A chemical has turned a different color, bubbled, and/or changed temperature.
A chemical has changed to a different state of matter, such as a liquid to a solid.
A chemical has changed size.
A chemical has become a different shape.
