WorksheetsMatter & Its Interactions PS.8.1
Total questions: 21
Worksheet time: 12mins
A student pours a cloudy liquid through a thin piece of paper and into a beaker. The student observes the collected liquid is not cloudy. How should the student classify the original cloudy liquid?
as a mixture, because the cloudy liquid was separated by evaporation
as a mixture, because the cloudy liquid was separated by filtration
as a compoud, because the cloudy liquid was separated by evaporation
as a compound, because the cloudy liquid was separated by filtration
Wendy draws a model to represent a neutral beryllium (Be) atom. Her model has 4 neutrons and 4 protons in the nucleus. It also has 5 electrons in orbits around the nucleus. Wendy's teacher says there is an error in her model. What is the error?
The model has too many protons.
The model has too many electrons.
The shows protons in the wrong location.
The model shows electrons in the wrong location.
How are the properties of helium (He) and krypton (Kr) similar?
Both are nonreactive gases at room temperature.
Both are nonreactive liquids at room temperature.
Both ar reactive gases at room temperature.
Both are reactive liquids at room temperature.
A scientist experiments on a piece of solid copper. The scientist heats the copper piece and observes the copper's density decreases as its temperature increases. The scientist continues to heat the copper until it melts.
How are the decrease in density and the melting similar?
They are both physical changes, because the composition of the copper piece remains the same.
They are both chemical changes, because the composition of the copper piece remains the same.
They are both physical changes, because the new substance has different chemical properties than copper.
They are both chemical changes, because the new substance has different chemical properties than copper.
Terry is learning about chemical reactions in science class. Terry's teacher draws an equation on the chalkboard and explains that the equation demonstrates the law of conservation of mass. What evidence supports this claim?
The same chemicals appear in both the reactants and the products.
The equation shows that the reaction produced a new substance.
There are equal numbers of each element in the reactants and in the products.
The arrangement of the chemicals in the reactants is the same as their arrangment in the products.
This element is a solid at room temperature and is very reactive.
flourine (F)
argon (Ar)
lithium (Li)
hydrogen (H)
This element is a gas at room tempearture and is not reactive.
flourine (F)
argon (Ar)
lithium (Li)
mercury (Hg)
This element is a gas at room temperature and is very reactive.
flourine (F)
argon (Ar)
lithium (Li)
mercury (Hg)
Methane is a pure substance and exists as a gas at room temperature. Each methan molecule is made up of one carbon atom chemically bonded to four hydrogen atoms. How is methane classified?
as an element
as a compound
as a homogeneous mixgture
as a heterogeneous mixture
An unidentified pure solid is composed of an element. The substance is metallic and reacts vigorously when placed in water. Where is this element most likely found on the periodic table?
at the top of the periodic table
at the bottom of the periodic table
on the left side of the periodic table
on the right side the periodic table
The list below describes the process of inflating a hot-air balloon.
1. A flame heats the air near the bottom opening of the deflated balloon. The air expands and rises as a result of the heating.
2. The hot air expands inside the deflated balloon. Then, the hot air applies pressure on the ballon's fabric walls, causing the balloon to change shape.
How does the air expanding compare to the balloon changing shape?
Both the air expanding and the balloon changing shape are physical changes.
Both the air expanding and the balloon changing shape are chemical changes.
The air expanding is a physical change, and the balloon changing shape is a chemical change.
The air expanding is a chemical change, and the balloon changing shape is a physical change.
Dean, Shiloh, and Evelyn are on a field trip to a farm. They come across a patch of soil. How would they classify this soil? Choose all that apply.
element
compound
homogeneous mixture
heterogeneous mixture
pure substance
What pure substance is made of 2 or more types of atoms?
compound
element
What is the smallest particle of matter?
a cell
an element
an atom
a proton
What is the primary difference between a physical change and a chemical change?
A physical change results in a new substance, while a chemical change does not.
A chemical change results in a new substance, while a physical change does not.
Both changes result in new substances.
Neither change results in new substances.
Explain how the law of conservation of mass applies to a chemical reaction. Provide an example to support your explanation.
The mass of the reactants is always greater than the mass of the products.
The mass of the reactants is always less than the mass of the products.
The mass of the reactants equals the mass of the products, as demonstrated by the reaction of hydrogen and oxygen to form water.
The mass of the reactants and products are unrelated.
How many atoms are in the molecule HCs3NaO2
12
7
11
14
Which of the following elements is a liquid at room temperature?
helium (He)
oxygen (O)
mercury (Hg)
carbon (C)
Which of the following best describes a chemical compound?
A substance made of only one type of atom.
A mixture of different elements and compounds.
A substance made of two or more types of atoms chemically bonded together.
A physical blend of two or more substances.
Which of the following best explains why a chemical reaction is considered balanced?
The number of molecules is the same on both sides of the equation.
The number of atoms of each element is the same on both sides of the equation.
The total volume of reactants and products is equal.
The total energy of the system remains constant.
Which of the following elements is most likely to be found in the noble gases group?
calcium (Ca)
chlorine (Cl)
neon (Ne)
iron (Fe)
