How many mol of hydrogen in 2.7 mol of caffeine?

If the temperature changes in a chemical reaction, what has occured? A) energy was destroyed B) energy was created C) there was no energy transfer D) energy was transferred

Which would have a greater molar mass, carbon monoxide or carbon dioxide? why?

A 50.00 g sample of an unknown metal is heated to 45.00°C. It is then placed in a coffee-cup calorimeter filled with water. The calorimeter and the water have a combined mass of 250.0 g and an overall specific heat of 1.035 cal/g•°C.

An electric fence displays a warning sign about the voltage and amperage of the fence. How would amperage and voltage affect the power of the fence?

You fall off your skateboard and skin your knee so you wash it and put a bandage on it. Which seven systems are you using most during this activity? explain your answer

The SI unit for current is: joules volts ohms amps

In chemical reactions, there is a conservation of what?

If the temperature of water increases as you heat it, the temperature is the independent variable. True False

Which is made by weathering? A. sediments B. minerals C. ash D. magma

Which Of These Is An Indication That A Chemical Reaction Has Occurred? A. Freezing Of A Substance B. Melting Of A Substance C. Boiling Of A Substance D. Formation Of A Gas