Question 1

The bond which results from a transfer of electrons from one atom to another is called an ionic bond.

Accepted Answer

An ionic bond occurs when electrons are transferred from one atom to another.

Question 2

Lemon Juice has a pH of 2.3 and should be classified as a

Accepted Answer

A pH below 7 is an acidic solution.A pH above 7 is a basic solution.

Question 3

When the concentration of hydrogen ions is greater than the concentration of hydroxide ions the solution is considered an acid.

Accepted Answer

Acids have Excess Hydrogen Ions.

Question 4

Alkalosis,cramping,and irritability can occur when our blood pH rises above 7.45.Acidosis,seizures,coma and death can occur when our blood pH falls below pH 7.35.To prevent these conditions,our blood usually has chemicals which

Accepted Answer

Normally,buffers take up excess hydrogen ions (H+)or hydroxide ions (OH-),thus preventing alkalosis and acidosis.

Question 5

Two or more different elements bonded together is called an isotope.

Accepted Answer

When atoms of two or more elements bond together in ﬁxed proportions,the product is called a compound.A molecule is the smallest part of a compound that still has the properties of that compound.

Question 6

Which of the following is not an impact of acid on the environment?

Accepted Answer

Excessice acidity degrades various parts of human and natural habitats.

Question 7

A solution which resists pH changes is

Accepted Answer

A buffer resists changes in pH.

Question 8

A chemistry student measures the pH of a solution as 7.1.The student adds five milliliters of an acid to the solution and finds that the pH of the solution is still 7.1.What conclusion could be made from these observations?

Accepted Answer

A buffer resists changes in pH.A buffer can take up excess hydrogen ions (H+)or excess hydroxide ions (OH-)in the solution.

Question 9

The attraction of an atom for the electrons in a covalent bond is called electronegativity.

Accepted Answer

The ability of an atom to attract electrons in a covalent bond is called its electronegativity.

Question 10

Radioactive isotopes can be used as tracers to detect molecular changes.

Accepted Answer

A radioactive isotope can act as a tracer to detect molecular changes.

Question 11

Out of covalent,ionic,and hydrogen,the hydrogen bond is the strongest.

Accepted Answer

A hydrogen bond is weaker than an ionic or covalent bond.

Question 12

Neutrons have a negative charge.

Accepted Answer

The subatomic particles are positively charged protons,uncharged neutrons,and negatively charged electrons.

Question 13

What type of solution has a pH of 8.2?

Accepted Answer