Which of the following is a chemical change?

a. sulfur and iron filings are mixed together in a beaker at room temperature.

b. sulfur and iron filings are mixed together and the iron is removed with a magnet.

c. a mixture of sulfur and iron filings are heated until the contents glow red and the appearance of the mixture changes. a magnet can no longer remove iron filings.

d. a mixture of sulfur and iron filings are placed in carbon disulfide, the sulfur dissolves, leaving iron behind in the bottom of the beaker.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

The following reaction shows the products when sulfuric acid and aluminum hydroxide react. al(oh)3 + h2so4 → al2(so4)3 + h2o the table shows the calculated amounts of reactants and products when the reaction was conducted in a laboratory. sulfuric acid aluminum hydroxide initial amount of reactant 40 g 15 g theoretical yield of water from reactant 14.69 g 10.38 g what is the approximate amount of the leftover reactant? 11.73 g of sulfuric acid 10.33 g of sulfuric acid 11.12 g of aluminum hydroxide 13.67 g of aluminum hydroxide

Describe what happens to the molecules as water goes from ice to liquid to vapor. be sure to explain what happens to the temperature during the phase changes.