Particles and Elements (Chemistry) Flashcards
What is H2O made up of?
Not needed for test
Each water molecule is made up of 2 hydrogen and 1 oxygen
What are the rows in the Periodic Table called?
Periods
What makes up a nucleus?
Protons and neutrons
Molecules
Combination of atoms
What are melting and freezing examples of?
Physical change
Physical change
- Reversible
- Change of state
- Individual particles
retain their original
properties - Doesn’t change
chemically
Gas
- No contact
- Random
- Fill the space
- Free to move
- Compressible
- Can mix
Which two liquids in the Periodic Table are liquids at room temperature?
Mecury (Hg) and Bromine (Br)
What are the columns in the Periodic Table called?
Groups
What are all the other elements?
Solids
Atomic number
Shows how many protons in nucleus and how may electrons orbiting
Is an electron’s charge positive, negative or neutral?
Negative
What is another name for Group 8?
Group 0
How do you raise the temperature?
By adding energy
What is Group 8?
Noble gases
How many gases are there in the Periodic Table?
12 gases
What is raising the temp. of a solid to get a liquid called?
Melting
What group is noble gases?
Group 8/0
Electrons
Negative charge, orbits nucleus
Is a neutron’s charge positive, negative or neutral?
Neutral
What happens if you lower the temp. of a liquid?
A solid forms
What happens if you raise the temp. of a liquid?
A gas forms
Matter
Stuff that makes up everything around us
Is a protons’ charge positive, negative or neutral?
Positive
Which group are alkali metals?
Group 1
In what order does the Periodic Table show the chemical elements?
Increasing order
What happens if you lower the temp. of a gas?
A liquid forms
What is lowering the temp. of a liquid to get a solid called?
Freezing
Chemical change
- Often irreversible
- Rearranges the atoms
- Makes a new substance
- Often results in a colour change
Liquids
- Some contact
- Random
- At bottom of box
- Some freedom
- Can mix
Who created the current version of the Periodic Table and when?
Mendeleev in 1869
What is Group 1?
Alkali metals
Why don’t some common chemicals show up in the Periodic Table?
Because they are compounds.
Which group are halogens?
Group 7
What is the formula for finding the neutron number?
Atomic mass- atomic number = Neutron number
What is Group 7?
Halogens
What is matter made up of?
Tiny particles called atoms
What happens if you raise the temp. of a solid?
A liquid forms
How many chemical elements does the Periodic Table show?
118
Atomic mass
Protons+ neutrons in nucleus
Solids
- Closely packed
- Neatly arranged
- Bottom of box
- Little movement
- Incompressible
- Cannot be mixed
