When the nucleus of an atom contains a constant number of protons but a variable number of neutrons, the atom is called a (n) ?

1) element

2) isotope

3) valence

4) dalton

How many moles of oxygen atoms are present in 5 H20

When more than one variable in an experiment is changed at a time, the scientist A. cannot tell which change produced the results. B. cannot accurately measure both variables at the same time. C.

Which statement is part of the kinetic molecular theory? O A. Gas particles are in constant motion. OB. Gas particles attract each other. ОС. Gas particles lose their energy during collisions. OD. Gas particles stick to the walls of their container.

Cisplatin is synthesized as follows: K2PtCl4 (aq) + 2NH3 (aq)  Pt (NH3) 2Cl2 (s) + 2KCl (aq) What mass of cisplatin can be made from 100. g of K2PtCl4 and sufficient NH3? What mass of KCl is also produced?

In a laboratory, Carlos places one plate with grape jelly and another plate with cooked brown rice inside an ant farm. The next day, he finds that both plates are filled with ants.

The chemical symbol for sodium is A. N. B. S. C. Na. D. Sn.

What is the pressure of a mixture of co2, so2, and h2o gasses, if each gas has a partial pressure of 25 kpa?

What are the two characteristics of air mass

Explain how humans have impacted the biome in which you live which is missouri

A scientist conducts an experiment to determine which fungi glow under ultraviolet light. What did the scientist most likely do before conducting the experiment? O A. Form a hypothesis B. Analyze data O c. Develop a theory D. Draw a conclusion