Which of the elements from the list below is considered a nonmetallic element? a

Question

Which of the elements from the list below is considered a nonmetallic element? a. Barium b. Calcium c. Iodine d. Chromium e. Platinum Which ionic compound listed below does not have the correct formula? a. Sr(NO_3)_2 b. MgPO_4 c. NaOH d. Al(SO_3)_3 e. BaCl_2 Which of the following groups of elements are considered representative elements or Main Group Elements? a. Alkali metals b. Alkaline Earth metals c. Halogens d. Noble Gas e. All of the above What is the ratio of a/b for the equation below where a, b, c, and d represent the coefficients in balanced equation? a.N_2H_4 + b. N_2O_4 rightarrow c. N_2 + d. H_2O a. 2/1 b. 1/2 c. 3/1 d. 3/2 e. none of these How many moles of N_2O are present in 10.0 g of N_2O? a. 0.227 mole b. 0.333 mole c. 0.455 mole d. 220 mole e. 440 mole How many grams of CO_2 are produced from bring 4.20 g C_2H_4 in air? What is the mass of 2.2 times 10^24 molecules of C_2H_4? a. 1.0 times 10^-2 g b. 10 g c. 77 g d. 1.0 times 10^2 g e. none of these

Explanation / Answer

5)
since 0.013 has only 2 significant figures, resut will have 2 significant figure
1.22*10^3 * 0.013 = 15.86 but rounding it to 2 significant fiire makes it 16
Answer: c

6)
electron has negligible mass
So, answer would be d
Answer: d

7)
atomic number is 16 (which is sulphur)
mass number is 16 + 17 = 33
since number of proton = number of neutrao, hence there are no charge

Answer:
33
S
16

8)

Iodine is non metal

Answer: c

I am allowed to answer only 1 question at a time

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