Chemical Reactions
In a chemical reaction the substances to the right of the arrow are called this/these?
Products
What are the parts of a chemical reaction?
Reactants and products
A substance that enters a chemical reaction is called this.
a reactant
Positive result for Carbon Dioxide Gas
Limewater going cloudy
What is it called when both sides of a chemical equation have equal numbers of each element?
Balanced
hydrogen + oxygen → water
Where are the reactants and products in this chemical reaction?
Reactants: hydrogen and oxygen
Products: Water
In the formula 5CaSO4,how many oxygen atoms do we have?
20
How many Aluminum atoms do we have in the products?
Al + O2 → Al2O3
2
What kind of reaction is this?
AB --> A + B
Decomposition Reaction
Positive test for Hydrogen Gas being produced.
How many Carbons are there in 3NaHCO₃?
What do we call this:
A + B → AB?
A combination reaction
Is this a balanced or not balanced equation?
H2S + NaCl → HCl + Na2S
Not balanced
What kind of Chemical Reaction is this?
Acid + Base --> Salt + Water
Neutralisation
State the Law of Conservation of Mass.
matter can not be created nor destroyed, just rearranged
How can we show salt is formed in a reaction in solution?
Evaporating/boiling off the water to leave behind the white solid
The weighted average of masses of all naturally occurring isotopes
The atomic mass
What does an atom of the element with atomic number 6 always have?
6 protons
How are elements arranged in the periodic table?
By increase in the atomic number.
Horizontally in periods
Vertically in groups
Is this equaction a balanced or not balanced chemical equation?
P4 + O2 → P4O6
Not balanced
How many oxygen are in 2C6H8O7
14
The elements to the left of the zigzag line in the periodic table
Metals
All of the following are examples of chemical change except:
Increase in temperature, release of light, formation of a solid, melting of ice
melting of ice
pH number
Positive result for oxygen gas
an extinguished splint re-igniting