Which of the following steps will speed up the reaction between coal and oxygen? 1. Keep the coal in a wide dish
2. Decrease the temperature of oxygen
3. Increase the temperature of coal
4. Keep the coal in a narrow test tube

Which properties describe all matter?

Which best describes red blood cells? a. they are colorless b. they protect against disease-carrying microorganisms c. they transport oxygen throughout the body d. they aid in blood clotting

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?