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WorksheetsNGSS.MS-PS1-5
Total questions: 20
Worksheet time: 19mins
PCl5+_ H2O→_ HCl+H3PO4
Identify if the following equation is unbalanced or balanced.
O3+2C→3OC
Unbalanced
Balanced
Can mass be created or lost in a chemical change?
Yes
No
Sometimes
The law of conservation of mass tells us that matter
cannot be created or destroyed
can be created and destroyed
Can be destroyed
Can be created
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
Determined whether the following equation is balanced or unbalanced. Ag + O2 ---> 2Ag2O
Balanced
Unbalanced
Which of the following is defined as, "an ending substance that is made during a chemical reaction"?
product
reactant
molecules
atoms
N2+O2--> _NO
TRUE or FALSE: "Matter cannot be lost even when a chemical reaction occurs."
TRUE
FALSE
Which of the following shows the correct balanced equation?
4Fe + 3O2 -> 2Fe2O3
2 Fe + 3O2 -> Fe2O3
4 Fe + O3 -> 2Fe2O3
None of the options are correctly balanced.
6Na + Fe2O3 --> 3Na2O + 2Fe
If you are provided 200g of sodium and 250 grams of iron(III) oxide, how much of excess reagent is left?
232 g
18 g
250 g
वह गैस जो आग को जलाने में सहायता करती है।
CO2
O2
N2
H2
Mg + __HCl ---> MgCl2 + H2
4Fe + 3O2 --> 2Fe2O3
What is the coefficient of O in the product side of the equation?
2H2O + O2 → 2H2O2
1
2
4
None
If more reactants are used in a chemical reaction, more products will be produced. This is because
More reactants cause the reaction to heat up
More reactants take up the same volume
More reactants have more atoms to react to form more products
Too many products can slow down the reaction
A burning candle is covered by a jar as shown in the picture. The whole arrangement has a mass of 500g. What will be the approximate mass of the arrangement when the candle is completely burnt, after four minutes?
0g
50g
250g
500g
