Question 1 :
The energy released (exothermic) or adsorbed (endothermic) in a chemical reaction is a result of:<br/>
Question 2 :
A chemical equation is balanced in accordance with the law of
Question 3 :
Which of the following is true with respect to Law of Conservation of matter?
Question 4 :
When mass is enclosed in a system and none is allowed in or out, it's _____ will never change.
Question 5 :
A balanced chemical equation is in accordance with the law of conservation of masses___________.
Question 7 :
Which one of the following laws directly explains the law of conservation of mass?<br/>
Question 8 :
Which gas law relates the volume of a gas to the number of molecules of the gas?<br/>
Question 9 :
Find the total number of pennies in a tenth of a mole of pennies.
Question 10 :
A sample of ammonia has a mass of $$51.1g$$. How many molecules are in this sample?
Question 11 :
How many moles are present in $$6.023\times 10^{22}$$ molecules of $$CO_2$$?<br>
Question 12 :
What is the volume of $$3.0\times {10}^{20}$$ molecules of $$HCl (g)$$?
Question 13 :
The critical volume of a gas is 0.036 $$lit. mol^{-1}$$. The radius of the molecule will be (in cm):<br/>(Avogadro Number = $$6 \times 10^{23}$$)<br/>
Question 14 :
Law of definite proportion does not apply to nitrogen oxide because:
Question 15 :
If the ratio of the atoms by mass is altered then :
Question 17 :
In a compound the ratio of the atoms or element by mass remains always same irrespective of :<br/>
Question 18 :
Different samples of water were found to contain hydrogen and oxygen in the ratio of 1 : 8. This shows the law of:<br/>
Question 19 :
The ratio of mass of nitrogen and oxygen in nitric oxide is in :
Question 20 :
The % of Copper and Oxygen in samples of CuO obtained by different methods were found to be the same. This proves the law of:<br/>