Question 1
A)
Taylor is learning about pure substance and mixture. In her notes, she included a table with the properties of pure substances and mixtures.
Which option BEST describes the error in the Taylor’s table?
(1 point)
Responses
Pure substances can be separated using physical means.
Pure substances can be separated using physical means.
Elements and compounds are considered mixtures.
Elements and compounds are considered mixtures.
Mixtures are substances that are not chemically combined.
Mixtures are substances that are not chemically combined.
Mixtures contain two or more substances.
Mixtures contain two or more substances.
Question 2
A)
Below is a picture with 4 different flasks. Which picture shows a flask containing a homogeneous mixture.
(1 point)
Responses
Flask A
Flask A
Flask B
Flask B
Flask C
Flask C
Flask D
Flask D
Question 3
A)Select the element from the choices below.(1 point)
Responses
HCl
HCl
NaCl
NaCl
MgBr
MgBr
O
O
Question 4
A)There are 3 unknown substances A, B, and C that need to be classified as element, mixture or compound.. Substance A can be broken down by a physical change. Substance B cannot be broken down by a chemical or physical change. Substance C can only be broken down by a chemical change. How would you classify these substances based on the given information?(1 point)
Responses
Substance A is a compound, substance B is an element, and substance C is a mixture.
Substance A is a compound, substance B is an element, and substance C is a mixture.
Substance A is an element, substance B is a compound, and substance C is a mixture.
Substance A is an element, substance B is a compound, and substance C is a mixture.
Substance A is a mixture, substance B is an element, and substance C is a compound.
Substance A is a mixture, substance B is an element, and substance C is a compound.
Substance A is a compound, substance B is a mixture, and substance C is an element.
Substance A is a compound, substance B is a mixture, and substance C is an element.
Question 5
A)Which statement is true?(1 point)
Responses
Particles in an object move faster at 50°C than at 20°C.
Particles in an object move faster at 50°C than at 20°C.
Particles move faster when they melt than when they evaporate.
Particles move faster when they melt than when they evaporate.
An object melts as the particles slow down.
An object melts as the particles slow down.
Particles speed up when an object solidifies.
Particles speed up when an object solidifies.
Question 6
A)
This graph shows the phase change for water.
Which statement best describes what is happening at portion C?
(1 point)
Responses
The energy is increasing, and temperature is also increasing.
The energy is increasing, and temperature is also increasing.
Both Energy and temperature remain the same.
Both Energy and temperature remain the same.
The temperature is increasing, but the energy stays the same.
The temperature is increasing, but the energy stays the same.
The energy is increasing, but the temperature stays the same.
The energy is increasing, but the temperature stays the same.
Question 7
A)
The following picture shows the particles in different phases of matter.
What phase of matter does picture A represent?
(1 point)
Responses
Gas
Gas
Solid
Solid
Liquid
Liquid
Plasma
Plasma
Question 8
A)Which phase change occurs when particles are slowing down and moving closer together?(1 point)
Responses
Melting
Melting
Boiling
Boiling
Evaporation
Evaporation
Condensation
Condensation
Question 9
A)
The table below shows the densities of three contrasting liquids.
Based on density, which picture shows how these liquids would arrange when placed in a container together?
(1 point)
Responses
Question 10
A)Which of the following is a physical property of potassium?(1 point)
Responses
Combustibility
Combustibility
Flammability
Flammability
Freezing point
Freezing point
Reactivity with acid
Reactivity with acid
Question 11
A)A liquid has a mass of 25 grams (g) and a volume of 10 milliliters (mL). Calculate the density of the liquid.(1 point)
Responses
0.4 g/mL
0.4 g/mL
2.5 g/mL
2.5 g/mL
4.0 g/mL
4.0 g/mL
250 g/mL
250 g/mL
Question 12
A)A student observes a raw egg float in concentrated salt water but sink in tap water. What can the student conclude from this observation?(1 point)
Responses
A raw egg is less dense than salt water but more dense than tap water.
A raw egg is less dense than salt water but more dense than tap water.
A raw egg has equal density as salt water.
A raw egg has equal density as salt water.
A raw egg, salt water, and tap water have equal densities.
A raw egg, salt water, and tap water have equal densities.
A raw egg is less dense than tap water but more dense than salt water.
A raw egg is less dense than tap water but more dense than salt water.
Question 13
A)Which of the following will NOT happen when a liquid undergoes a physical change?(1 point)
Responses
The kinetic energy of the molecules increases.
The kinetic energy of the molecules increases.
The molecules become more closely packed.
The molecules become more closely packed.
The molecules will rearrange to form new chemical bonds.
The molecules will rearrange to form new chemical bonds.
The motion of the molecules will decrease.
The motion of the molecules will decrease.
Question 14
A)Maya heats a liquid until it changes to a gas. What type of change occurs to the liquid?(1 point)
Responses
Physical
Physical
Chemical
Chemical
None
None
Question 15
A)A cut apple reacts with the oxygen in the air after being cut by turning dark, which is a physical change.(1 point)
Responses
True
True
False
False
Question 16
A)Joe watches a candle burn. What chemical change does he observe?(1 point)
Responses
The candle wax turns liquid as it burns
The candle wax turns liquid as it burns
The heat melts the candle wax
The heat melts the candle wax
The candle wax changes shape
The candle wax changes shape
Heat and light are produced
Heat and light are produced
Question 17
A)
Which element does NOT have similar chemical properties to neon (Ne)?
(1 point)
Responses
F
F
Xe
Xe
He
He
Ar
Ar
Question 18
A)
Use the provided figure to answer the question below.
Using the information from the Periodic Table of Elements, identify the correct numbers of subatomic particles for one atom of iron?
(1 point)
Responses
One atom of iron would have 26 electrons, 26 protons, and 55 neutrons.
One atom of iron would have 26 electrons, 26 protons, and 55 neutrons.
One atom of iron would have 26 electrons, 26 protons, and 26 neutrons.
One atom of iron would have 26 electrons, 26 protons, and 26 neutrons.
One atom of iron would have 26 electrons, 26 protons, and 30 neutrons.
One atom of iron would have 26 electrons, 26 protons, and 30 neutrons.
One atom of iron would have 55 electrons, 55 protons, and 26 neutrons.
One atom of iron would have 55 electrons, 55 protons, and 26 neutrons.
Question 19
A)
Use the periodic table of elements below to answer the following question.
A scientist has compiled the table below to show the composition of an unknown atom.
(1 point)
Responses
Sulfur
Sulfur
Silicon
Silicon
Nitrogen
Nitrogen
Phosphorus
Phosphorus
Question 20
A)Marcus knows that sodium (Na) is found in Group 1, Period 3 on the periodic table. Where should he look to find another element that has similar properties to those of sodium?(1 point)
Responses
In Group 1
In Group 1
In Period 3
In Period 3
On the opposite side of the Periodic Table
On the opposite side of the Periodic Table
At elements whose symbols begin with the letter N
At elements whose symbols begin with the letter N
Question 21
A)A scientist discovers a stack of newspapers is burned completely to ash in his laboratory. How does the resulting mass relate to the initial mass of the stack of newspapers?(1 point)
Responses
The mass of the gasses and the ash should equal the mass of the original stack of newspapers.
The mass of the gasses and the ash should equal the mass of the original stack of newspapers.
The mass of the gasses and the ash should be one-fourth the mass of the original stack of newspapers.
The mass of the gasses and the ash should be one-fourth the mass of the original stack of newspapers.
The mass of the gasses and the ash should be double the mass of the original stack of newspapers.
The mass of the gasses and the ash should be double the mass of the original stack of newspapers.
The mass of the gasses and the ash should be one-half the mass of the original stack of newspapers.
The mass of the gasses and the ash should be one-half the mass of the original stack of newspapers.
Question 22
A)Stuart measures 10 grams of water into a pan and freezes it. A day later he takes it out of the freezer and is surprised that it is larger than before he froze it. What is the mass of the ice?(1 point)
Responses
10 grams
10 grams
11 grams
11 grams
20 grams
20 grams
25 grams
25 grams
Question 23
A)The reactants in a chemical equation have 4 potassium atoms, 3 oxygen atoms, and 2 iron atoms. According to the law of conservation of matter, the products of this chemical equation should have:(1 point)
Responses
4 iron atoms, 2 potassium atoms and 3 oxygen atoms
4 iron atoms, 2 potassium atoms and 3 oxygen atoms
the same number of atoms but of different elements.
the same number of atoms but of different elements.
the same number of atoms of each element.
the same number of atoms of each element.
Twice as many atoms of each element.
Twice as many atoms of each element.
Question 24
A)
Note the equation below is not balanced. This is because the total number of atoms of each element in the reactants is not equal to the total number of atoms of each element in the products.
In order to balance the equation, how many H atoms must be present in the second product that is formed?
(1 point) Responses
1
2
3
4
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Question 25
A)
If a chemical reaction is endothermic, which statement best describes what is happening with the energy during the reaction?
(1 point)
Responses
Energy is being released.
Energy is being released.
Energy is being absorbed.
Energy is being absorbed.
Energy remains constant.
Energy remains constant.
Energy is being converted to mass.
Energy is being converted to mass.