Which of the following elements is an alkali metal?

potassium (K)

calcium (Ca)

chromium (Cr)

germanium (Ge)

Por favor! Se disuelven en agua 30.5g de cloruro amónico hasta obtener 0.5 Lde disolución. Sabiendo que la densidad es la misma que 1027kg/m^3, calcula: a.) La molalidad. b.) La normalidad.

Calculate how many moles of no2 form when each quantity of reactant completely reacts. 2n2o5 ( g.→4no2 ( g.+o2 ( g.

What has occurred when a solid forms out of the mixing of two liquids in a chemical reaction? melting gas formation combustion precipitate formation

Water is known as the 'universal solvent' because: Water is capable of dissolving every substance. Water can dissolve many ionic and covalent compounds. Water can dissolve many substances, but often requires large amounts of heat to be added.

A theory which repeatedly fails to confirm the expected predictions: probably needs to be developed into a law probably should be discarded requires more research time should be maintained indefinitely,

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.