Which one of the following is a pure substance? 1. milk2. Concrete3. Wood 4. Salt water5. Elemental copper

Which burns faster, a large log or the same log cut into small sticks of wood? 1. neither, both burn at the same rate 2. small sticks of wood 3. a large log

Which type of bond must be broken for water to vaporize?

In the presence of oxygen, the cells convert glucose into energy through a process called: Select one: a. anaerobic metabolism. b. respiration. c. perfusion. d. aerobic metabolism.

If 8.0 g of NH4HS (s) is placed in a sealed vessel with a volume of 1.0 L and heated to 200 ∘C the reaction NH4HS (s) ⇌ NH3 (g) + H2S (g) will occur. When the system comes to equilibrium, some NH4HS (s) is still present.

Of these four liquids, which has the lowest viscosity? options: Pancake syrup at room temperature Motor oil that is in the refrigerator Liquid mercury at room temperature A glass of lemonade at room temperature

What type of wave is sound? a. gamma b. pressure c. electromagnetic d. light

4. State the difference between mass and weight.

Jayla has two wires that are both made of pure copper. One of the wires is bigger than the other wire. Which of the following is true about the particles of the wires? A. The large copper wire will have smaller particles than the small copper wire.

84 g of water contains how many molecules of water?

What can a drop of liquid mercury be described as? A) a pure substance and a compound B) an impure substance that is reactive C) an impure substance that is unreactive D) a pure substance and an element