Conversions, Specific Heat, and Thermochemistry

A negative (-) sign in a chemical reaction represents an...

A positive sign (+) in a chemical reaction means...

Calculate the amount of heat needed to increase the temperature of 250g of water from 20C to 46C. Check to see if you need to convert anything, the answer must be in joules!!! (The specific heat of water is 4.18J/gC)

Convert 850 cal into joules

Convert 4.71 kcal into kilojoules

Convert 0.00378 kg into grams

Calculate the H value heat for the following reaction:
Fe2O3(s) + 3CO(g) --> 2Fe(s) + 3CO2(g) H = ? kJ/mol
Solve by writing formation equations for each reactant and product and using the H values for each. Table is found in your homework

What mass of water can be heated from 25.0° C to 50.0° C by the addition of
2825 J? The specific heat of water is 4.18 J/gC

If a test tube feels warm to the touch, it is an example of an

How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22ºC to 55ºC, if the specific heat of aluminum is 0.90 J/gºC?

How much heat is required to raise the temperature of 250.0 g of mercury by 52°C? (Make sure to convert grams to kilograms) The specific heat of mercury is .140J/gC

When 435 J of heat is added to 3.4 g of olive oil at 21°C, the temperature increases to 85°C. What is the specific heat of the olive oil?

When heat is released, it is called...

Convert 1.8 kJ into joules

Gold has a specific heat of 0.129 J(g*C). How many joules of heat energy are required to raise the temperature of 15 Kg of gold from 22C to 85C?

A student mixes two chemicals and suddenly is really cold... this is an example of

______________ is the capacity to do work or supply heat

When heat is absorbed into a system, it is called...

444 joules into calories