Which of the following is a chemical reaction?

1-Painting a wall blue

2-A bicycle rusting

3-Ice cream melting

4-Making a sand castle

When 83.3 grams of phosphorus pentachloride react with an excess of water, as shown in the unbalanced chemical equation below, how many moles of hydrochloric acid will be produced? PCl5 + H2O yields H3PO4 + HCl 0.4 moles 1.0 moles 1.6 moles 2.

What the value of the 5 digit in 751,486

A student performs an experiment to determine the density of a sugar solution. She obtains the following results: 1.11 g/mL, 1.81 g/mL, 1.95 g/mL, 1.75 g/mL. If the actual value for the density of the sugar solution is 1.

Which type of allergy test, also called a subcutaneous test, introduces dilute solutions of allergens into the skin of the inner forearm or upper back with a fine-gauge needle?

The names of the components FeS, NaCl, and Al (3) O (2) all end in the suffix. A. - ide B. - ite C. - ic D. - ate

Combustion analysis of toluene, a common organic solvent, gives 8.20 mg of co2 and 1.92 mg of h2o. if the compound contains only carbon and hydrogen, what is its empirical formula?

Why does the moon have phases? What are the four main phases of the moon? How long does it take to change from one to another?

How many atoms are in 1/2 mole of calcium

Which of the following units is best when measuring the mass of an object?

When balancing an equation, should you adjust the subscripts or the coefficients?