Which sample is a pure substance?

a test tube of zinc oxide

a container of zinc and oxygen

a flask of pond water

a jar of soil

Why is HCl considered a strong acid?

which is greater, the number of compounds or the number of elements? the number of elements or the number of isotopes?

If two atoms combine by sharing electrons, what kind of bond is formed?

1. Which of the following best describes the difference between the procedures used in Experiments 1 and Experiment 2? A. In Experiment 1, the temperature was varied; in Experiment 2, the diameter of the tube was varied.

For this ionic compound, what would be the name of the anion? Ca (NO3) 2 A. nitrite B. nitrate C. calcite D. sulfate

What are the coefficients that will balance this skeleton equation? a l c l 3 + naoh → al (oh) 3 + nacl?

Which cluster in the agriculture industry would be most likely to partner with the animal systems cluster to introduce new modern procedures to animal careers

Sarah is ordering cheese pizza for a party of ten people she knows each pizza has 8 slices to figure out how many pizzas to order sarah needs to know the

How many grams of sodium ions are in na2so4?

Electron configuration for iron?