A reproducible measurement is an accurate one.

Sometimes true? Always true? Never true?

If you mix 40 grams of copper with 60 grams of sulfur, how much copper (I) sulfide (Cu2S) can be produced during the reaction? 2Cu + S → Cu2S

If an element has an atomic mass of 127 and an atomic number of 53, how many neutrons does it have? 74 127 53 75

When a chemical reaction and its reverse are occurring at the same time and at the same rate, the reaction has achieved a. displacement. c. imbalance. b. equilibrium. d. decomposition.

This is when atoms of elements combine by sharing electrons or by the complete transfer of electrons from one atom to another.

Which of the following have a neutral charge

A 5.701 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 12.28 grams of CO2 and 5.029 grams of H2O are produced. In a separate experiment, the molar mass is found to be 102.1 g/mol.

One amu is equal to the mass of an electron the mass of one proton or one electron the mass of one neutron or one electron the mass of one neutron or one proton

Given an unknown mixture consisting of two more substances, explain how could you determine whether that mixture is a true solution, a colloid or a suspension

Which isotope of lithium has 3 neutrons?

Write the complete electron configuration for the noble gas found in the third period