Chemistry

Which of the following activities is NOT a part of good science?

• developing a hypothesis

• proposing a theory

• indulging in speculation

•  designing experiments

   

An intelligent guess is a part of a scientific method called a(n) ________________.

• Law

•  Hypothesis

•  Theory

• Experiment

It is a state of matter which has a definite shape and size.

•  gas

• liquid

• solid

• plasma

Which of the following pairings of terms is INCORRECT?

• Heterogeneous mixture—two or more regions with different properties

• Compound—two or more elements present

• Element—a single type of atom

• Mixtures— cannot be separated by physical means

Which of the following element is a non-metal?

• Iron

• Chlorine

• Mercury

• Magnesium

Which of the following pairs of elements are one element a metal and the other element a nonmetal?

•  ₃₀Zn and ₃₁Ga

• ₁₆S and ₁₇Cl

•  ₉F and ₅₃I

• ₅₃Bi and ₁₅P

Which of the following is NOT belonging in Group 2?

• Be

• Ba

• K

• Mg

Which of the following elements is located in Period 4 and Group IVA of the periodic table?

• N

• Si

• Ge

• In

The electronic configuration of an atom is 1s²2s²2p⁶.  The element is _____.

• Neon

• Boron

• Nitrogen

• Helium

Bromine is the only non-metal that is a liquid at room temperature. Consider the isotope         bromine-81, . Select the combination which lists the correct atomic number, neutron number, and mass number respectively.

• 35, 81, 46

• 35, 46, 81

• 46, 81, 35

• 81, 46, 35