Chemical Reactions
In a chemical reaction the substances to the right of the arrow are called this/these?
What is/are products?
A _______________ tells you how many molecules there are of a compound.
Coefficient
This category of elements are most likely solids at room temperature & are found to the left of the zigzag
Metals
In the formula 5CaSO4,how many oxygen atoms do we have?
20
Is this reaction balanced?
Al + Br2→ AlBr3
No! it is not balanced
hydrogen + oxygen → water
Where are the reactants and products in this chemical reaction?
Reactants: hydrogen and oxygen
Products: Water
All of the following are potential evidence of a chemical change except:
Increase in temperature, release of light, formation of a solid, melting of ice
melting of ice
Group with 8 valence electrons
Noble Gases
How many Carbons are there in NaHCO₃?
1
Is this a balanced equation?
H2S + NaCl → HCl + Na2S
Not balanced
When balancing an equation, these numbers can be changed.
a coefficent
What do we call this:
A + B → AB?
A chemical reaction - Synthesis
What do we call the elements on the right side of the periodic table?
Nonmetals
How many Aluminum atoms do we have in the products?
Al + O2 → Al2O3
2
At room temperature, the metal mercury is a liquid. How could mercury be changed into a solid?
Remove energy (cool) to slow particle motion
When balancing an equation, these numbers can not be changed.
subscript
What is the law that states atoms and mass must be equal on both sides of a chemical equation?
The Law of Conservation of Mass
Neutral atoms of this element have 19 electrons
Potassium (K)
How many oxygen are in 2C6H8O7
14
Is this equaction a balanced or not balanced chemical equation?
P4 + O2 → P4O6
Not balanced
This word refers to a solid forming out of a liquid solution, and is often evidence for chemical reactions
Precipitate
If 70 grams of sodium reacts wtih chlorine to form 126 grams of salt. How many grams of chlorine reacted?
56 grams.
Alkali Metals & Halogens
A subscript tells you how many __________ there are in a compound.
atoms
The majority of an atom's mass exists where?
In the nucleus