Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle. Which on is the Independent variable, dependent variable, and controlling variables?

A 78 gram sample of uranium loses half of its mass each year. how much is left after 6 years?

Assuming that a chemical reaction doubles in rate for each 10° temperature increase, by what factor would the rate increase if the temperature were increased 40°C?

Which of the following is not a step in the conversion of 25 L to hm3? fraction cubed: one m over ten to the negative second power m one mL over ten to the negative third power L one cubic cm over one mL fraction cubed: one hm over ten to the second

What is the mass of 1.50 mol of sodium, na?

Give some examples of solute and solvent.

If a microgram is one millionth of a gram (0.000 00 1 g), how many micrograms are there in one gram?

A solution is prepared at that is initially in chloroacetic acid, a weak acid with, and in potassium chloroacetate. Calculate the pH of the solution. Round your answer to decimal places.

What type of reaction is most likely to occur when barium reacts with fluorine? combustion synthesis decomposition single replacement?

Which air pollutant contributes to asthma? Emissions Particulate matter Contaminated groundwater Carbon monoxide

Carbon has an atomic number of 6. How many electrons are in a carbon atom's second energy level?