7. Which if the following forms of matter is a pure substance? (A) Soil (B) Tabl

Question

7. Which if the following forms of matter is a pure substance? (A) Soil (B) Table salt (C) Orange juice (D) Concrete 8. Which of the following has the most kinetic energy? (A) one mole of liquid water at 300 K (B) one mole of solid water (ice) at 270 K (C) one mole of carbon dioxide gas at 200 K (D) one mole of carbon dioxide gas at 400 K When 32 g of oxygen gas and 4 g of hydrogen gas are allowed to react, we obtain 36 g of water. If we allow 32 g oxygen gas and 8 g of hydrogen gas to react, we still obtain 36 g of water. This illustrates the law of 9. (A) multiple proportions (B) excess reactants (C) ideal gases (D) kinetic molecular gases (E) definite proportions 10. Tritium is common name for (A) Hydrogen-o (B) Hydrogen -1 (C) Hydrogen-2 (D) Hydrogen -3 11. Which is the current view of the organization of subatomic particles in atoms? (A) Protons and electrons are tightly packed into a small nucleus. Neutrons occupy the space outside of the nucleus. (B) Protons, electrons, and neutrons are tightly packed into a small nucleus. (C) Neutrons and protons are tightly packed into a small nucleus. Electrons occupy the space (D) El outside of the nucleus. ectrons are tightly packed into a small nucleus. Protons and neutrons occupy the space outside of the nucleus.

Explanation / Answer

7.

Answer is

Table salt or common salt is a mineral composed primarily of sodium chloride.

8.

Answer is (D)

Kinetic energy = 1/2mv2 = 3/2kT

9.

Answer is (B)

Hydrogen is taken as excess.

10.

Answer is (D)

Tritium (also known as hydrogen-3) is a radioactive isotope of hydrogen.

11.

Answer is (c)

Since, nucleus = protons + neutrons = Atomic mass

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