Compounds and Chemical equations Flashcards
Atomic Structure and the Periodic Table
1
Q
what is a compound?
A
substances that elements mix and match to make
2
Q
what happens during chemical reaction?
A
- at least one new substance
- when two or more elements react they form compounds
- the atoms of each element are in fixed proportions
- the atoms are held together by chemical bonds
3
Q
what does a formula show?
A
what atoms are in a compound, the number of element symbols tell you how many elements are in the compound
4
Q
name 5 formulas
A
carbon dioxide - CO2
water - H2O
sodium chloride - NaCl
carbon monoxide - CO
sulfuric acid - H2SO4
5
Q
how are chemical reactions shown?
A
by using chemical equations, one way to show a chemical equation is through a word equation
6
Q
whats an example of a word equation?
A
- methane reacts with oxygen to make carbon dioxide and water
methane + oxygen — carbon dioxide + water
7
Q
what are the chemicals on the left side?
A
they are reactants because they react with each other
8
Q
what are the chemicals on the right side?
A
they are called products because they’ve been produced from the reactants
9
Q
how do you balance an equation?
A
- find an element that doesn’t balance and write a number (in pencil) in front of one of the substances to try and even it
- if it is still isn’t balanced, keep trying with other numbers until they are all balanced evenly
