Matter is made up of atoms about 0.1 nm in size. Atoms and molecules are arranged differently in solids, liquid and gases. Density is calculated from mass divided by volume.
How large are atoms?
1 × 10-9 m
1 × 10-10 m
1 × 10-11 m
What was J J Thomson’s plausible model option of the atom called?
The chocolate chip cookie model
The plum pudding model
The Christmas pudding model
What did Geiger and Marsden’s alpha scattering experiment show?
The plum pudding model was right
Atoms are mostly empty space with a small nucleus
Atoms don’t have any positive charge
What is the equation for density?
Mass × volume
Volume ÷ mass
Mass ÷ volume
The density of iron is 7.8 g/cm3. What is the mass of 5 cm3 of iron?
What is the density of a rock if it has a mass of 1,500 kg and a volume of 0.5 m3?
What is the mass of 15 cm3 of a substance that has a density of 50 g/cm3?
Which statement about atoms is correct?
The nucleus is negatively charged and contains most of the mass of the atom
The electrons are negatively charged and contain most of the mass of the atom
The nucleus is positively charged and contains most of the mass of the atom
What is the volume of 300 kg of water if it has a density of 1,000 kg/m3?
If gold has density of 19.3 g/cm3, what is this in kg/m3?