Answer:
A: Calcium is a group 2 element with two valence electrons. Therefore, it is very reactive and gives up electrons in chemical reactions. It is likely to react with an element with six valence electrons that “wants” to gain two electrons. This would be an element in group 6, such as oxygen.
Factor that can be controlled changed or measured in an experiment.
Answer:
B
Explanation:
to find how many moles we have you need to use the molarity equation which for this is
40g * (1mole/200g) = .2 moles
Given we know that we have .2 moles
then all you have to do is divide amount of moles by amount of liters to find the molarity
for this problem it is
.2mol/2L which is .1 M
Answer:
12.6 L CO2
Explanation:
Mass = 24.7 grams
Molar mass = 44.01 g/mole
Volume at STP = ?
The relationship between these quantities is given as
Number of moles = Mass / Molar mass
Number of moles = 24.7 g / 44.01 g/mole
Number of moles = 0.5612 moles
1 mol = 22.4 L
0.5612 mol = x
x = 0.5612 * 22.4
x = 12.6 L