Which of these is a chemical change

a / fire works eploding

b/grinding powder

c/iorning shirt

Energy is released during the fission of Pu-239 atoms as a result of the (1) formation of covalent bonds (2) formation of ionic bonds (3) conversion of matter to energy (4) conversion of energy to matter

Identify the class of organic compounds to which methyl palmitate belongs.

How many isomers with a molecular formula of c6h10 contain an internal alkyne?

Which type of reaction is represented by the generic equation AB + CD - > AD + CB? O combustion decomposition single replacement double replacement

Hydrocarbons in which carbon atoms form only single bonds and are arranged in a ring are called

Which of the following are physical properties of a penny? Choose all that are correct. Select one or more:a. Slightly red in color. b. Conducts electricity very well. c. Reacts to oxygen when heated. d. Resists corrosion from most acids.

NO2 and N2O4 undergo the reaction shown. When a sealed container of NO2 reaches chemical equilibrium, which must be true? A) No N2O4 is present. B) No chemical reactions are occurring. C) The rates of the forward and reverse reactions are equal.

What differences did you notice in the different states of water

1. Bubbling or fizzing is an indicator of a. property change b. phase change c. physical change d. chemical change

In the second step of this reaction, isocyanic acid reacts to form melamine and carbon dioxide: HNCO (l) →C3N3 (NH2) 3 (l) + CO2 (g) Balance this reaction and enter the coefficients below.