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Question 1: Examples of chemical change.

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Question 1: Examples of chemical change.

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Burning candle,rusty nail and moldy food.

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Question 2: Examples of physical change 

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Question 2: Examples of physical change 

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Question 2: Examples of physical change

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Question 3: Which type of change involves the creation of new substances ?

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Question 3: Which type of change involves the creation of new substances ?

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Chemical change

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Question 4- Part A: Define Reactant and Product

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Question 4- Part A: Define Reactant and Product

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Reactant is the substance consumed, and Product is the substance formed.

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Question 4- Part B: Which is on the left  and which is on the right?

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Question 4- Part B: Which is on the left  and which is on the right?

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Reactants are on the left, and Products are on the right.

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A number placed before a formula in a chemical reaction.

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Question 6- Identify the number of atoms of each element and the total number of atoms.  

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Question 6- Identify the number of atoms of each element and the total number of atoms.  

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a) H₂O        b)NH₄NO₃     c) Fe₂(SO₄)₃   d) N₂O5
H: 2                    N=14                               Fe= 55.8*2= 111.6                N= 14*3=28
O: 16                  H=4                                 S= 32.1* 3= 96.3                   O= 16*5=80
Total: 19            N=14                              O=16*4=64*3= 192                   Equals: 108
O=16.3=48                             Equals: 399.9
Equals: 80

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Number of elements is always equal on each side of the arrow in a balanced chemical reaction

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2 KClO3 ---> 2 KCl + 3 O₂
Type of reaction= decomposition

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2 N2 + 5 O₂ ---> 2 N₂O5
Type of reaction= Synthesis

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2 Hg₂O ---> 4 Hg + 1 O2
Type of reaction= Decomposition

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4 NH3 + 3 O2 ---> 2 N2 + 6 H₂O
Type of reaction= Single replacement

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1N₂ + 3H₂ ---------->   2NH3
Type of reaction: Synthesis

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2Fe + 3 Cl₂ --------> 2FeCl3
Type of reaction: Synthesis

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0Mg + 2HCl --------> 0 MgCl₂ + 0 H₂
Type of reaction: Double Replacement

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Question 15: Law of Conservation of Mass states:

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Question 15: Law of Conservation of Mass states:

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Chemical equations must be balanced
"In an ordinary chemical reaction matter is neither created nor destroyed"