Density
What is the formula for density?
D=M/V
What kind of change is water turning into ice?
Physical change
What does the atomic number of an element represent?
Number of protons and electrons
How many hydrogen and oxygen molecules in H2O?
2 hydrogen and 1 oxygen
Is C (Carbon) a metal or a non metal?
Non-metal
What 2 measurements are needed to find density
Volume and Mass
What kind of property is colour, hardness, lustre, and brittleness
Qualitative properties
What happens when you subtract the atomic number from the atomic mass of an element?
You get the number of neutrons
What is a subscript
The number after and below the element representing the number of atoms
What do the horizontal columns represent on the periodic table
Periods
If you put an iron ring with the density of 14.2g/cm3 in a cup of jello with the density of 10.4g/cm3 what will happen to the ring
It will sink
What are colour change, change in temperature, odour and formation of gas all signs of?
A chemical change
What is the number of neutrons for the element Mg (Magnesium)
12 (24-12)
What is a prefix
Indicates the number of molecules
What are the vertical columns on the periodic table called?
Groups or families
Get ready to calculate:
What is the density of a solid object with a mass of 4350 g and a volume of 5.5 cm3?
791g/cm3
What kind of change is mixing baking soda and vinegar
Chemical change
What is the valence shell
The very last orbit of an atom where the valence electrons are.
How many Barium, Nitrogen and Oxygen molecules in Ba(No3)2 (Barium Nitrate)?
1 Barium molecule
2 Nitrogen molecules
6 Oxygen molecules
What is the difference between an element and a compound
Elements are pure substances made from one type of atom.
Compounds are pure substances made from two or more different elements.