the rare earth elements (lanthanide group)
Answer:
Possibly:
Matter consists of atoms atoms arrange into different compounds to make certain molecules
Yes you can divide atoms into even smaller particles
Protons neutrons electrons
Plum pudding
Explanation:
After 1 half life, 1/2
After 2 half lives, 1/4
After 3 half lives, 1/8
Oxygen gas expands in a container and when pressure is applied it liquifies and occupies a smaller volume
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Answer:
When a Magnesium Ribbon is burnt, a powdery substance called magnesium oxide is formed.
Explanation:
There has obviously been a chemical change because several chemical properties of the magnesium have been modified: the color, the texture and the mass.
The increase in mass is due to the fact that oxygen from the air has combined with the magnesium to make magnesium oxide, MgO.
The chemical equation, Mg + O2 MgO shows this reaction but it needs to be balanced to make 2Mg + O2 2MgO.
Using stoichiometry, we can convert this eqation into an equation with moles:
2 mol Mg + 1 mol O2 2 mol MgO.
Next, we convert to grams using atomic masses obtained from the periodic table:
48g Mg + 32g O2 80g MgO
Lastly, we determine the same thing in the proportions we used. In other words, we used only 0.15g of Mg (not 48g) so everything needs to be divided by 320. So 80 / 320 = 0.25 g. If we burn 0.15 g of Mg, we obtain 0.25 g of MgO.
Hope this helps!!!
This is my first answer.
