Synchronus class

What are the main components of an atom?

• Protons, neutrons, and ions

• Protons, electrons, and molecules

• Protons, neutrons, and electrons

• Nucleus, shells, and compounds

What do elements in the same group (column) on the periodic table typically have in common?

• The same atomic mass

• The same number of electron shells

• Similar chemical behavior due to the same number of valence electrons

• They are all noble gases

What is an atom called if it has more electrons than protons?

• A cation

• An isotope

• An anion

• A neutral atom

What type of bond forms when the difference in electronegativity between two elements is greater than 1.7?

• A nonpolar covalent bond

• A metallic bond

• An ionic bond

• A polar covalent bond

What principle explains why water and oil do not mix?

• Water molecules are too small to interact with oil molecules.

• Oil molecules are denser than water molecules.

• Water is a polar molecule, and oil is a nonpolar molecule.

• Water and oil have different boiling points.

Which state of matter is characterized by high temperature, low pressure, and high entropy?

• Solid

• Liquid

• Gas

• Plasma

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What type of mixture has particles that are evenly distributed but not fully dissolved, placing it between a solution and a suspension?

• Homogeneous mixture

• Heterogeneous mixture

• Colloid

• Pure substance

A chemical reaction where the total enthalpy of the products is lower than that of the reactants, resulting in heat being released to the surroundings, is called what?

• Endothermic

• Exothermic

• Endergonic

• Exergonic

What happens to the entropy when an ice cube melts?

• It decreases significantly.

• It remains unchanged.

• It increases significantly.

• It first decreases then increases.