Helium has an atomic number of 2 and atomic mass of 4. explain.

Write the balanced chemical equations of the following reaction: Hydrogen and oxygen react to form water.

When sugar is added to a sugar solution, the sugar does not dissolve. Which term describes the original sugar solution? O A. Semisaturated O B. Supersaturated C. Saturated D. Unsaturated

Metals are easy to bend beacuse

If you place a dialysis tubing permeable only to water filled with 10% sucrose solution into a beaker filled with a 30% solution of sucrose, what would you expect

Which region (s) of the period table contains elements that can adopt both positive and negative oxidation numbers?

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.

How does hess's law use intermediate reactions to calculate the enthalpy of a desired reaction?

Which atomic particle dtermines the chemical behaviour of an atom?

If you could travel to the Sun and back, about how far would you travel? A. 1 AU B. 2 AU C. 5 AU D. 10 AU

A scientist is conducting a descriptive experiment where she is monitoring sea level along coastal towns in California. What is a major benefit of this experiment? The relationship shows cause and effect. It is repeatable.