Toolkit

How many energy levels does sulfur have?

A. 2

B. 3

C. 4

D. 14

Which of the following chemicals can damage the central nervous system, cardiovascular system, reproductive system, hematological system, and kidneys with overexposure? A. Asbestos B. Lead C. Silica D. Welding fumes

A stable atom that has a large nucleus most likely contains ... ? A.) more neutrons than protons B.) more protons than neutrons. C.) equal numbers of protons and neutrons. D.) changing numbers of protons and neutrons.

Put the steps of the scientific method into the correct order. Submit results for repeatability State conclusions Devise an experiment to prove or disprove Define the problem Propose a hypothesis

Would the following errors increase, decrease, or have no effect on the calculated moles of gas collected in the experiment? Explain your answers in complete sentences. a) The measured mass of the magnesium was smaller than the true mass.

Why is Ca + NaCl - > Ca (NaCl) 2?

1. Crystals of ammonium chloride, NH4Cl, seem to disappear when mixed with water. The resulting clear liquid containing ammonium chloride and water is a A) compound. B) new substance. C) homogeneous mixture. D) heterogeneous mixture. 2.

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.

Which material best absorbs sound waves in a room? a. heavy curtains b. hardwood floors c. brick walls d. cement floors

Does density of water depend on the amount of water present?