Answer:
Block A has the greatest density.
Explanation:
Three blocks are shown: Three blocks are shown.
Block A has mass 3 kilograms, length 6 centimeters, height 4 centimeters, and width 2 centimeters.
Block B has mass 1 kilograms, length 6 centimeters, height 2 centimeters, and width 4 centimeters.
Block C has mass 2 kilograms, length 2 centimeters, height 6 centimeters, and width 4 centimeters.
Which statement is correct?
- Block A has the greatest density.
- Block B has the greatest density.
- The density of Block A is equal to the density of Block B.
- The density of Block B is equal to the density of Block C
Answer:
It's a rapid motion and collisions of molecules with the walls of the container that causes pressure.
Answer:
Ice is the last major agent of weathering, erosion, and deposition.
Explanation:
Water often seeps into the cracks in rocks. When the temperature drops, the water in the cracks freeze and expand, causing the crack to widen. Eventually, the rock is broken into smaller pieces.
(B) Because acceleration is change of speed over time.
Answer:
First confirm the reaction is balanced:
C3H8 + 5O2 --> 3CO2 + 4H20 (3 cabon - check; 8 hydrogen - check; 10 oxygen - check).
a) In the equation there is a 5:1 ratio between propane and oxygen. We also know that number of mole is proportional to pressure and volume. Since pressure is constant (STP) then the volume of O2 is 7.2 * 5 = 36 litres.
b) For a near ideal gas that PV = nRT (combined gas law). So for 7.2 litres propane we find n(propane) = 101.3 * 7.2/8.314*298 ~ 0.29 mole (using metric units throughout for simplicity).
There is a 1:3 ratio between propane and CO2. Therefore 3 * 0.29 = 0.87 mole of CO2 is produced.
MW(CO2) ~ 44 g/mol. Therefore m(CO2) = 44 * 0.87 ~ 38.3 g
c) We know we need more oxygen than propane (due to the 1:5 ratio) so oxygen is the limiting reagent. Again Volume is proportional to number of mole and we see there is a 5:4 ratio between oxygen and water. Therefore the volume of water vapour produced will be (4/5) * 15 = 12 litres.
The other questions use the same technique and will give you some much needed practice.
Explanation:
