How much energy is needed to warm 13.0 milligrams of water at 1.0 degrees Celsius to 75.00 degrees Celsius. Is this process endothermic or exothermic

A sample of an ore of iron, hematite, is 79% Fe2O3. How much iron is there in 4 kilograms of the ore? Answer in units of g.

Do all samples of specific substances have the same chemical composition?

During science lab, Jacob mixes together sodium hydroxide (NaOH) and hydrochloric acid (HCl). The two chemicals react to form sodium chloride (NaCl) and water (H2O). Which of the following are reactants in the chemical reaction described above?

If the evidence you collect during experiments does not support your hypothesis, what should happen to that hypothesis.

What do all oxygen atoms have in common

Why does an apple fall toward the earth, instead of the earth moving toward the apple?

If the moles and temperature of a gas are held constant, the pressure of a gas doubles when: Volume is halved Volume is quadrupled Volume is doubled Volume is also held constant

The life function of transport in an organism directly involves those activities used to 1. absorb and distribute materials 2. obtain and hydrolyze materials 3. release energy from food 4. produce cellular waste product

What is the orbital diagram for phosphorus

The atoms of gaseous helium are