مراجعة العلوم

Explain how a polar solvent dissolves a polar solute.

• The positive end of a polar solvent will surround the positive end of a polar solute. The negative end of a polar solvent will surround the negative end of a polar solute.

• The negative end of a polar solvent will surround the positive end of a polar solute. The positive end of a polar solvent will surround the negative end of a polar solute.

• The positive end of a polar solvent will surround the positive end of a polar solute. The positive end of a polar solvent will surround the negative end of a polar solute.

• The negative end of a polar solvent will surround the positive end of a polar solute. The negative end of a polar solvent will surround the negative end of a polar solute.

Describe how antifreeze in a car can help prevent both freezing and overheating.

• Anti-freeze decreases boiling point and increases the freezing point of a substance.

• Anti-freeze increases boiling point and increases the freezing point of a substance.

• Anti-freeze decreases boiling point and decreases the freezing point of a substance.

• Anti-freeze increases boiling point and decreases the freezing point of a substance.

Explain the type of reaction shown in the picture

• Ionization

• Dissociation

• combustion

• Displacement

• None of these

How is it possible to eat acidic things without changing your blood pH?

• Substances called buffers react with the acidic things and the pH of blood increases.

• Substances called buffers react with the acidic things and keep the pH of blood normal.

• Substances called buffers react with the acidic things and the pH of blood decreases.

• Substances called acidosis react with the acidic things and keep the pH of blood normal

What does pH measure?

Why is a pH of 7 considered to be neutral?

• A pH of 7 is neutral because the concentration of hydrogen ions is equal to the concentration of hydroxide ions.

• A pH of 7 is neutral because the concentration of hydrogen ions is greater than concentration of hydroxide ions.

• A pH of 7 is neutral because the concentration of hydrogen ions is less than the concentration of hydroxide ions.

• A pH of 7 is neutral because the concentration of hydrogen ions is equal to the concentration of hydronium ions.

Explain the law of conservation of mass.

• Mass is either created or destroyed in a chemical reaction.

• Mass is created but not destroyed in a chemical reaction.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass is not created but is destroyed in a chemical reaction.

Describe the purpose of coefficients in a chemical equation.

• Coefficients describe the number of atoms of each reactant or product in a chemical equation.

• Coefficients describe the number of atoms of each reactant but not product in a chemical equation.

• Coefficients describe the number of atoms of each product but not reactant in a chemical equation.

• Coefficients describe the number of reactant or product in a chemical equation.

How can you tell whether a chemical equation is balanced or not?

• An equation is balanced if the number of atoms is greater on the reactant side than products.

• An equation is balanced if the number of atoms of each element is the same on the reactant and product side.

• An equation is balanced if the number of atoms is greater on the product side than reactants.

• An equation is balanced if the number of atoms is unequal on the reactant and product side.

• Synthesis Reaction

• Decomposition Reaction

• Single Displacement Reaction

• Combustion Reaction

• Double Displacement Reaction

Compare and contrast oxidation and reduction.

• Oxidation is the gain of electrons while reduction is the loss of electrons.

• Oxidation is the loss of electrons while reduction is also the loss of electrons.

• Oxidation is the gain of electrons while reduction is also the gain of electrons.

• Oxidation is the loss of electrons while reduction is the gain of electrons.