Which of the following have the most similar properties?

A. Sodium (Na) and Magnesium (Mg)

B. Carbon (C) and Silicon (Si)

C. Argon (Ar) and Chlorine (Cl)

D. Potassium (K) and Calcium (Ca)

Which is least likely to occur after an experiment is conducted to test a hypothesis? a. The data is analyzed to see if it supports or refutes the hypothesis. b. The same experiment is conducted again to see if the data are reliable. c.

2.18 Determine whether each of the following statements is true or false; if false, correct the statement to make it true: (a) The nucleus has most of the mass and compris- es most of the volume of an atom;

Match the following definition to the type of solution it describes. unsaturated solution saturated solution supersaturated solution A. The amount of solute dissolved is less that the maximum amount the solution can hold. B.

The metric unit of force is the A. gram. B. kilogram. C. nanometer. D. newton.

In an energy diagram, the reactants are at a higher potential energy compared to the products. Which of the following best describes this reaction? A) It is endothermic and will have a positive enthalpy.

Which atom has a nucleus that contains 13 protons and 14 neutrons 1. Mg 2. Be 3. Al 4. N

Determine the oxidation state of the metal ion in [co (nh3) 5br]2+. express your answer as an integer.

Which functional group contains oxygen atom? a. Carbonyl group b. Amino group c. Sulfhydryl group

A mountain is a example of solid?

Explain, in terms of electrons, why the radius of a calcium ion is smaller than the radius of a calcium atom.