compressed into a smaller container? (A) Gas particles have no mass. (B) Gas par

Question

compressed into a smaller container? (A) Gas particles have no mass. (B) Gas particles move randomly in all directions at all 4. Which statement explains why a gas sample can be Which statement best describes molecules in the gas phase? The molecules are CA) far apar t and moving at the same speed B) far apart and moving at a distribution of (G) elose together and moving at a distribution of times. speeds (C) Gas particles are much smaller than the distances (D) broken down into atoms and moving at a between them. distribution of speeds. 2. (D) Gas particles undergo elastic collisions in which Which is true of water that has been boiling for twenty energy is conserved. minutes? (A) Attractions between the water molecules are broken (B) Water molecules break apart forming oxygen gas (C) Water molecules release two hydrogen ions and (D) Air trapped between the water molecules form liquid water? The molecules of solid water (A) are lighter than the molecules of liquid water. (B) are farther apart than the molecules of liquid water (C) take up less space than the molecules of liquid 5. At the molecular level, why does solid water (ice) float in as the gas escapes and hydrogen gas. oxygen escapes as bubbles. bubbles that rise to the surface. water have stronger covalent bonds than the molecules of liquid water. (D) 3. One mole of water (H,O) has a mass of 18 grams, and one mole of natural gas (methane, CH) has a mass grams. A state, and methane is found as a this difference? 6. When glucose (CHO) is placed in water, (A) it breaks apart into individual atoms (B) it melts into the liquid phase. (C) it separates into individual molecules. (D) it separates into its component ions 7. of 16 n temperature water is found in the liquid t room gas. What best explains Water has stronger covalent bonds than methane. Water molecules are heavier than methane molecules. (A) (B) (C) Water has stronger intermolecular forces tharn (D) What is the chemical formula for the gas represented in the figure below, where (O) is a phosphorus atom, and Co) is a chlorine atom? methane. One methane molecule contains twice the hydroger atoms as one water molecule. (A) PC (B) (PCh (C) (PC (D) P.Cl

Explanation / Answer

1. B

2. A

3. C, as water presents with strong intermolecular hydrogen bonding due to electronegativity difference between oxygen and Hydrogen

4. C

5. A, as the density of ice, is less than that of liquid water

6. B, as glucose dissolution occurs without breaking any bond between them

7. A, the diagram represent PCl3 molecule

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