All of the following are signs that a chemical reaction may have taken place in a piece of glass except. a. the shape of the glass changes. b. energy is used or given off. c. new substance besides glass are formed. d. the glass changes color.

What does your data indicate about the optimum ph level for this enzyme-catalyzed reaction?

What coefficient is needed in front of the Carbon (C) in the reactants in order to balance the equation? C + 2SO2 - -> CS2 + 4CO 5 6 4 3 Hint: The number of atoms in the reactant, must equal the number of atoms in the product, for each element

Choose the pair of substances that are most likely to form a homogeneous solution. a. c6h14 and c10h20 b. libr and c5h12 c. n2o4 and nh4cl d. c6h14 and h2o e. none of these pairs will form a homogeneous solution.

When sodium metal is added to water, an orange flame is observed on the metal surface. Based on this observation, what can best be concluded? A physical change occurs because the metal gets smaller.

When aluminum, Al, metal is dipped in an aqueous solution of hydrochloric acid, HCl, hydrogen gas, H2, is produced with the formation of an aluminum chloride, AlCl3, solution.

Two children are playing tag. Child A who is doing the chasing can run 100m in 24 seconds Child B is running away from child A and can run 64m in 21 seconds.

What ion does a base increase

What is the definition of Amplitude?

An excess of NiCO3, 12 g, was added to 40cm cube of sulpheric acid, 2.0 mol/dm cube. The unreacted nickel carbonate was filtered out and the filtrate evaporated to optain the crystals.

Under what condition is decompostion the fastest? Under what condition is it the slowest?