Which of these is an indicator that a chemical reaction has occurred?

precipitate forms

temperature remains the same

color is diluted

mass increases

Whenever a number or a variable is divided by itself, it is always equal to

How many resonance structures does NH₃ have?

What percent is tungsten made of from soil?

In an exothermic reaction the bonding energy of the product is: less than the reactants same as the reactants greater than the reactants dependent upon the presence of a catalyst

A fluorine ion has 9 protons and a charge of negative one how many electrons are in an ion of fluorine

elect all of the true statements regarding chemical equilibrium. The concentrations of reactants and products are equal. The concentrations of reactants and products remain constant. Reactants are being converted to products and vice versa.

Is dew forming on a leaf a physical or chemical change?

What are some examples of density?

A 0.110 mol sample of an ideal gas occupies 3.50l. what is the volume of 0.250 moles of this gas at the same temperature and pressure?

Give an example of an industry i n which Chemistry is used and explain how it is.