Difference between nitrogen fixatio and dentrification

A substance undergoes a change. Which statement indicates that the change was a chemical change?

What is the ratio of atoms in carbon dioxide, or CO2

Will give brainiest Quick tell me two very interesting nucular elements

Which of the following is the correct balanced equation for the reaction in which hydrogen peroxide (H2O2) is broken down into hydrogen gas and oxygen gas? A. H2O2 - - > 2H2 + O2 B. 2H2O2 - - > 2H2 + O2 C. H2O2 - - > H2 + O2 D. H2O2 - - > H2 + 2O2

Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow.

The heat of combustion of propane, C3H8, is 2220 kJ/mol. The specific heat of copper is 0.385 J/g°C. How many grams of propane must be burned to raise the temperature of a 10.0 kg block of copper from 25.0°C to 65.

Which is an example of Temporal Isolation? A. Flowers that bloom in different months. B. Birds that have different mating calls C. Fruits flies that mate in different locations. D. Squirrels that have different fur colors

A chemical reaction can start when enough activation energy is added to the reactants. Do you think the activation energy for chemical reactions in living things is high or low / Explain your answer

20 Which statement describes a reversible reaction at equilibrium? (1) The activation energy of the forward reaction must equal the activation energy of the reverse reaction.

Count the total number of atoms in CaCO3: 2 3 4 5 6