How many electrons are in the nucleus of an atom with an atomic number of 20?

Which ranks these materials by the attraction between their atoms from the weakest to the strongest? oxygen gas, liquid water, liquid honey, solid iron ore liquid water, liquid honey, oxygen gas, solid iron ore solid iron ore, liquid honey, liquid

Which process best describes the melting of ice cream? Exothermic Disintegration Endothermic Decomposition

N which of the following situations would a spring scale be used? A. a study of the effect of different fertilizers on plant growth B. an investigation of the efficiency of different simple machines C.

An exothermic reaction has A) a negative ΔH, absorbs heat from the surroundings, and feels cold to the touch. B) a positive ΔH, gives off heat to the surroundings, and feels warm to the touch.

Why nucleus is stable?

What are small round structures in the cell that breaks down large food particles into smaller ones

A balloon has a volume of 2.5 L and contains 0.100 moles of Helium. Another balloon has a volume of 5.0 L. They are at the same temperature and pressure. How many moles of gas does the second balloon contain?

Why is it important to that the solid be dry before the final mass measurement?

What is 0.00055030 in Scientific form?

What happened to the rate of the forward reaction and the rate of the reverse reaction as time progresses. Describe the rates when the reacion reaches equilibrum.