Chemical Bonds
Law of Conservation of Mass
Chemical Equations
100
Name three types of chemical bonds
Polar
Non-Polar
Covalent
Ionic
100
Define the law of conservation of mass
Mass is neither created or destroyed, it simply stays the same
100
What does the value circled in the equation represent?
The subscript- this tells us how much of an element there is in the equation
200
Which particles can be lost or gained to form a chemical bond?
Electrons
200
True or False:
The mass of a substance will change when a phase change occurs
False-A phase change is a physical change and in the LOCOM, mass is neither created or destroyed, it will stay the same even when a phase change occurs
200
Explain the difference between a reactant and a product
A reactant is when 2 or more substances interact to create a different substance
A product is what is created after the reactants come together
300
Why is water considered to be a polar molecule?
It contains both positive and negative charges that are considered as polar covalent bonds
300
Explain how the following image represents the law of conservation of mass
The amount of each color particle is the same in the beginning as in the end, the amount has not changed
300
Balance the chemical equation:
N2 + 3H2 = 2NH3
400
Explain the difference between a covalent bond and an ionic bond
A covalent bond is a bond in which electrons are being shared amongst atoms
An ionic bond is a bond in which atoms do not share electrons, but contain a positive and negative end
400
Imagine this glass of water with ice weighs 100 grams. What must it weigh once the ice melts for the law of conservation of mass to be applicable?
100 grams because it must weigh the same before and after for the law to be in effect
400
Balance the chemical equation:
C2 + O2 = CO3
C2+3O2=2C03
500
Describe the chemical bonds found in fuel
Hydrogen and Carbon bonds are found in fuel (fossil fuels) that are created when these two elements come into contact with each other
500
How is mass conserved in a chemical reaction?
Mass is conserved even when a chemical reaction occurs and something new is created. The atoms in the reactant will form new bonds to create the product, but the substance remains the same throughout
500
What happens to the mass of the reactants in fuel of a car?
The mass of the reactants stays the same because a chemical reaction is occurring which does not change the mass before or after.