Question

1.The percentage of copper and oxygen in samples of CuO obtained by different

methods were found to be the same. The illustrate the law of:

a)Constant proportion b)Conservation of mass

c)Multiple proportions d)Reciprocal proportions

2. Adding electrons to an atom will result in a (an):

a)Molecule ` b)Anion

c)Cation d)Salt

3. Which of the following represents a correct chemical formula? Name it.

a) CaCl b) BiPO4

c) NaSO4 d) NaS

4. The work done by a force on 50 kg body in order to accelerate it from rest to 2.4

ms-1

in 10 s:

a) 144 J b) 14.4 J `c) 1.44 J d) 1200 J

5. 1 KWh is equal to

a) 36 x 105

J b) 3.6 x 105

J c) 1 unit d) both a and c​​

Answer 1

Answer:

Explanation:

Law of Chemical Combinations. The ... in samples of CuO obtained by different methods were found to be the same. ... conservation of mass. ... the same elements combined together in the same proportion by mass. Here, copper and oxygen combined in the same proportion. So, the correct answer is constant proportions.