conservation of mass
definite proportion
multiple proportion
reciprocal proportion
Correct answer is C
Law of multiple proportions, statement that when two elements combine with each other to form more than one compound, the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.
A sample of a gas may be identified as chlorine if it turns
damp blue litmus paper red
lime water miky
lead ethanoate paper black
starch iodide paper blue-black
Correct answer is D
A test for chlorine is to place damp starch-iodide paper into a test tube of chlorine. A positive result for chlorine is indicated by the paper turning from white to blue-black.
The formula of mercury (l) dioxonitrate (III) is
HgNO3
Hg2NO2
Hg2(NO2)2
Hg(NO3)2
Correct answer is C
No explanation has been provided for this answer.
2,3 and 4
2, 4 and 3
1,2 and 3
1, 3 and 5
Correct answer is A
xCH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + zH\(_2\)O
Balancing the equation, we have
C = x (on the left) and 2 (on the right)
⇒ x = 2
2CH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + zH\(_2\)O
On the left, H = 8 and on the right = 2z
⇒ 2z = 8 ; z = 4
2CH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + 4H\(_2\)O
On the right, O = 4 + 4 = 8.
On the left, O = 2 + 2y
⇒ 2 + 2y = 8
2y = 6 ; y = 3
x, y, z = 2, 3, 4.
3.01 x 1022
6.02 x 1022
6.02 x1023
1.20 x 1024
Correct answer is A
32g of sulphur = 64g / 6.02 x 10\(^{23}\) atoms of SO\(_2\)
xg of sulphur = 3.2g of SO\(_2\)
: 1.6g of sulphur is present in 3.2g / 3.01 x 10\(^{23}\) atoms of SO\(_2\)