WorksheetsEnergy Staar Review
Total questions: 20
Worksheet time: 10mins
Which statement describes an action that most likely resulted in a chemical reaction?
A pan of water was heated on a stove, and steam formed.
A liquid was mixed with another liquid, and a precipitate formed.
A liquid was sprayed into the air, and a sweet odor was smelled.
A child blew through a wand filled with soap, and bubbles were produced.
Which of these observations is an indication that a chemical reaction has occurred?
Steam forms above boiling water.
A solid forms when a clear solution is frozen.
A solid forms when two clear solutions are mixed.
Sugar crystals form on the sides of a boiling pot of sugar water.
Based on the observations, which statement contains the best evidence that a chemical reaction occurred?
There is a change in shape.
There is a change in volume.
The two liquids mix into a solution.
The two liquids form a new substance.
Which statement best describes evidence that a chemical reaction occurs as a cake bakes?
The water in the cake batter evaporates.
The cake rises as gas bubbles form in the baking cake.
The cake takes the shape of the container in which it is baked.
The water in the cake batter is used to keep the cake moist as it bakes.
Which balanced equation represents a reaction that involves 14 atoms of oxygen?
NH₄Cl + KOH → NH₃ + H₂O + KCl
2Na + 2H₂O → 2NaOH + H₂
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
4Fe + 3O₂ → 2Fe₂O₃
Which substance listed in the chart is made up of the most atoms?
Carbonic acid
Nitric acid
Phosphoric acid
Sulfuric acid
Matter can undergo physical or chemical changes. Which of these are examples of physical changes? Select TWO correct answers.
Burning wood
Breaking an egg
Cooking an egg
Freezing a popsicle
Rusting iron
Which sample property indicates that an element is likely a nonmetal?
Excellent conductivity
Dull surface appearance
Ability to be stretched into wires
Shiny surface appearance
If a sample has a blue-gray color and shatters when hit with a hammer, how is it classified?
Metal
Nonmetal
Metalloid
Alloy
Which of the following properties is NOT typically associated with metals?
Shiny surface
Poor conductivity
Excellent ductility
High thermal conductivity
What property is shared by all metals in terms of their reaction to being hit with a hammer?
They shatter
They bend
They melt
They remain unchanged
What is the typical surface appearance of a nonmetal?
Shiny
Dull
Metallic
Transparent
Which property is most useful for distinguishing between metals and metalloids?
Color
Conductivity
Surface appearance
Reaction to water
If a sample is yellow and has excellent conductivity, how is it classified?
Nonmetal
Metalloid
Metal
Gas
Based on the properties shown in the chart, which element is most likely a nonmetal?
Element 1
Element 2
Element 3
Element 4
A student is trying to classify an unidentified, solid gray material as a metal or a nonmetal. Which question will best help the student classify the material?
Is the material malleable or ductile?
Does the material feel hard to the touch?
Will the material float in water?
Does the material feel rough or smooth?
According to Newton's Second Law of Motion, what two factors determine the acceleration of an object?
Net force and mass
Speed and velocity
Distance and time
Energy and power
What is the correct unit for measuring force?
Joule
Newton
Watt
Pascal
Which statement best describes the resulting motion of the duck? The duck pushes against the water, so the water pushes the duck forward with 20 newtons of force. The water also exerts 15 newtons of resistive force against the duck.
The duck will stop moving.
The duck will stop and then start moving again.
The duck will continue moving in its current direction.
The duck will move in the direction that the stream is flowing.
An equation for a chemical reaction is shown: NaOH + HCl → NaCl + H₂O. Which statement provides evidence that mass is conserved in the reaction?
Two new substances are formed in the products.
Water is one of the products, but not one of the reactants.
Two hydrogen atoms are in the reactants, and two hydrogen atoms are in the products.
One chlorine atom pairs with one sodium atom in the products, and one chlorine atom pairs with one hydrogen atom in the reactants.
