HESI A2 Chemistry Test
25 Questions
Step-by-step Answer Explanations
Pass Guarantee
LATEST UPDATE
, 1. 1. Question
Which of the following is not a simple sugar?
Glucose
Dextrose
Glycogen
Fructose
Answer: Glycogen
A simple sugar (also called a ‘monosaccharide’) is a sugar whose molecules cannot be
hydrolyzed any further into smaller sugars. Glycogen is a polysaccharide, which is composed of
numerous glucose molecules.
2. 2. Question
Which option correctly converts 4.51 × 10-5 to standard notation?
0.00000451
0.0000451
4,510,000
4,510
Answer: 0.0000451
, Scientific notation is a way to write very large or very small numbers. This method of notation is
useful to scientists when they are writing very large or very small numbers, so they don’t have
to write so many zeroes!
To convert from scientific notation to standard form, look at the exponent:
o The value of the exponent tells you how many spaces to move the decimal. Since
the value of the exponent in 4.51 × 10-5 is 5, this tells us we will need to move the
decimal 5 spaces.
o The sign of the exponent tells you which direction we are going. A positive
exponent tells us to move the decimal to the right. A negative decimal tells us to
move the decimal to the left. Since the sign of the exponent in 4.51 × 10-5 is
negative, this means we will be moving the decimal to the left.
So, since the exponent is negative and has a value of 5, so we just need to move the decimal 5
places to the left to arrive at the answer, 0.0000451.
You may use the examples below as a visual reference for how scientific notation represents
numbers.
3. 3. Question
Which of the following occurs when ice melts?
Water molecules gain kinetic energy.
None of these
Water molecules lose kinetic energy.
The kinetic energy of water molecules does not change.
Answer: Water molecules gain kinetic energy.
25 Questions
Step-by-step Answer Explanations
Pass Guarantee
LATEST UPDATE
, 1. 1. Question
Which of the following is not a simple sugar?
Glucose
Dextrose
Glycogen
Fructose
Answer: Glycogen
A simple sugar (also called a ‘monosaccharide’) is a sugar whose molecules cannot be
hydrolyzed any further into smaller sugars. Glycogen is a polysaccharide, which is composed of
numerous glucose molecules.
2. 2. Question
Which option correctly converts 4.51 × 10-5 to standard notation?
0.00000451
0.0000451
4,510,000
4,510
Answer: 0.0000451
, Scientific notation is a way to write very large or very small numbers. This method of notation is
useful to scientists when they are writing very large or very small numbers, so they don’t have
to write so many zeroes!
To convert from scientific notation to standard form, look at the exponent:
o The value of the exponent tells you how many spaces to move the decimal. Since
the value of the exponent in 4.51 × 10-5 is 5, this tells us we will need to move the
decimal 5 spaces.
o The sign of the exponent tells you which direction we are going. A positive
exponent tells us to move the decimal to the right. A negative decimal tells us to
move the decimal to the left. Since the sign of the exponent in 4.51 × 10-5 is
negative, this means we will be moving the decimal to the left.
So, since the exponent is negative and has a value of 5, so we just need to move the decimal 5
places to the left to arrive at the answer, 0.0000451.
You may use the examples below as a visual reference for how scientific notation represents
numbers.
3. 3. Question
Which of the following occurs when ice melts?
Water molecules gain kinetic energy.
None of these
Water molecules lose kinetic energy.
The kinetic energy of water molecules does not change.
Answer: Water molecules gain kinetic energy.
