A solid object has a mass of 30 grams and a volume of 10 cm3.

Which is the density of the object?

Is mixing sodium hydrogen carbonate and hydrochloric acid a physical or chemical change

Which subatomic particles are located in the nucleus of an He-4 atom? (1) electrons and neutrons (2) electrons and protons (3) neutrons and protons (4) neutrons, protons, and electrons

What would be the formula of the precipitate that forms when pb (no3) 2 (aq) and k2so4 (aq) are mixed?

Two iron balls of different mass are heated to 100°C and dropped in water. If the same amount of heat is lost by the two balls to water, what can be said about the final temperatures of the two balls?

An atom of which of these elements most likely forms an anion? A. AI B. Br C. Ca D. Mg

What is the force applied when using a simple machine.

Select all that apply. when the products of a reaction have more energy than the reactants: the reaction is exothermic. the reaction is endothermic. the reactants gave up energy. the δh is positive.

How can you determine the number of valence electrons in an atom of a representative element?

Find the cube root of 2.7*10^10

What is the mass of one mole of titanium atoms