What is the meaning of a value of - 400 kJ in a reaction? The reaction requires 400 kJ of heat. The reaction releases 400 kJ of heat. The products have 400 kJ of heat energy more than the reactants. The reaction will not occur.

Inorganic compounds which are found in the earth are called: minerals vitamins synthetics cement

How many miles are in 0.062500 light seconds (s) ?

A student mixes 50g of sugar with 300g of water and 5g of lemon. What is the mass of the solution?

Which is an example of an energy transformation? (A) a soccer ball sitting in a field. (B) a person waiting at a crosswalk. (C) an unlit candle. (D) a boulder falling off a tall cliff.

The force of attraction between two objects varies with what two factors

The volume of a gas is reduced from 4 L to 0.5 L while the temperature is held constant. How does the gas pressure change? It increases by a factor of two. It increases by a factor of eight. It decreases by a factor of eight.

Write the complete balanced equation for the decomposition of sodium chloride (NaCl)

What is the term for the different phases water can take?

The amazing successes of science are because scientists have followed the rules of science True or false

In this assignment, you will write and balance a chemical equation. Then, you will use a table of enthalpy values to calculate the energy change in the reaction. Next, you will create a model of the energy change in the reaction.