A compound has 39 g of potassium and 78 g of selenium. What is the mass ratio of potassium and selenium in the compound

Which choice is not a property of an acid? A. neutralize bases B. turns litmus paper red C. corrodes active metals D. turns litmus paper blue

Form a hypothesis sharks don't have swim bladders and must move constantly or they sink. hypothesize about the amount of food that a shark must eat compared to the amount eaten by a bony fish of the same size

Is NaCi a metal or nonmetal

The half-life of carbon-14 is 5730 years. Explain how to figure out the age of a substance that has 25% carbon-14 remaining.

Which situations make use of interactive multimedia and which do not? Amelia is exploring a shopping website looking for clothes or accessories she could give to her sister.

Which of the following gases in Earth's atmosphere would you expect to find as molecules and which as individual atoms? a. Nitrogen b. Oxygen c. Argon

A substance that does not conduct electricity as a solid but does conduct electricity when melted is most likely classified as (1) an ionic compound (2) a molecular compound (3) a metal (4) a nonmetal

What is done with the reactive sodium after the reaction to make sure the products are safe in an air bag?

Which of the following does not indicate a chemical change? precipitate formation crushing a solid into a powder color change gas evolution

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?