(8 marks) l. Answer the following questions by selecting the best answer: 1) Met

Question

(8 marks) l. Answer the following questions by selecting the best answer: 1) Methane and ethane are both made up of carbon and hydrogen. In methane, there are 12.0 g of carbon for every 4.00 g of hydrogen, a ratio of 3:1 by mass. In ethane, there are 24.0 g of carbon for every 6.00 g of hydrogen, a ratio of 4:1 by mass. This is an illustration of the law of A) constant composition B) multiple proportions C) conservation of matter D) conservation of mass E) octaves 2) The atomic mass for Uranium is; B) 238 A) 92 C) 88.91 D) 144.2

Explanation / Answer

(1) This is an illustration of (A) constant composition

So option (A) is correct

(2) The atomic mass of uranium is 238 amu

So option (B) is correct

(3) The mass number is equal to the sum of protons and neutrons

Therefore option (D) is correct.

(4) The atomic number of an element = number of protons = 56

Since there are 2 electrons less than the expected atomic number so the element is a cation with two unis of positive charge.

So the element is Ba2+

So option (D) is correct

(5) An anoin is an atom that has gained an electron.

So option (B) is correct

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