Calculate the atomic mass of element X if there are two isotopes of this element (X-24 and X-28) and 75% of all X atoms are X-28 isotopes? 52 amu 26 amu 4 amu 27 amu

Covalent compound for c4i7

An atom can be compared to our solar system because: The nucleus gives off light like the sun. Both electrons and planets move quickly. Electrons orbit the nucleus like planets orbit the sun. All of the above.

Express 0.000000384 in scientific notation

How many protons and neutrons does gallium have?

Calculate the temperature change in the water upon the complete melting of the ice. Assume that all of the energy required to melt the ice comes from the water. Express your answer in terms of the initial temperature of water, T.

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?

What is the net ionic equation for the following reaction? H2CrO4 + Ba (OH) 2

How does improving food-storage facilities make farming more sustainable? A. It decreases the amount of water needed. B. It keeps food from rotting as quickly and being wasted. C. It decreases the amount of land needed. D.