PS.8.1.4 - Physical and Chemical Changes
Authored by Shirley Martin
Science
8th Grade
NGSS covered
Used 37+ times
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15 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Zinc and Hydrochloric Acid
A teacher places zinc (Zn) into a flask containing hydrochloric acid (HCl). A balloon is attached to the flask to collect the gas produced during the reaction. The zinc is dropped into the acid, and bubbles form as the balloon expands. The teacher carefully removes the balloon and ignites the gas inside. The gas burns. Students record their observations before and after the reaction in the data table.
Which statement BEST interprets the temperature change that occurred in the experiment?
All reactions that include zinc discs release heat.
All reactions that include hydrochloric acid release heat.
When the substances were combined, the physical change released heat.
When the substances were combined, the chemical reaction released heat.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-4
NGSS.MS-PS3-4
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Zinc and Hydrochloric Acid
A teacher places zinc (Zn) into a flask containing hydrochloric acid (HCl). A balloon is attached to the flask to collect the gas produced during the reaction. The zinc is dropped into the acid, and bubbles form as the balloon expands. The teacher carefully removes the balloon and ignites the gas inside. The gas burns. Students record their observations before and after the reaction.
Which conclusion is best supported by the data?
A physical change occurred because the mass remained the same.
A physical change occurred because the temperature increased..
A chemical change occurred because new substances with different properties were produced.
No change occurred because the total mass remained 262 g.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Zinc and Hydrochloric Acid
A teacher places zinc (Zn) into a flask containing hydrochloric acid (HCl). A balloon is attached to the flask to collect the gas produced during the reaction. The zinc is dropped into the acid, and bubbles form as the balloon expands. The teacher carefully removes the balloon and ignites the gas inside. The gas burns. Students record their observations before and after the reaction on the data table.
Select the TWO observations that can be used as evidence to support that a chemical change took place.
Bubbles form when the reactants are mixed.
The mass of substances increase during the experiment.
The balloon begins to expand after the reactants are mixed.
The mass of the substances before the experiment is 262 grams.
Bubbles are present in the hydrochloric acid before the experiment.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The students in Ms. Ramirez's science class are classifying different types of reactions. They have divided the reactions into two columns, as shown below.
Why are the reactions listed in Column B classified as physical reactions?
They produced new substances with different properties.
The changes do not affect the materials' characteristics/identity
They released heat during the reactions.
The reactions are irreversible.
Tags
NGSS.MS-PS1-2
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
The students in Ms. Ramirez's science class are classifying different types of reactions. They have divided the reactions into two columns, as shown below.
Why are the reactions listed in Column A classified as chemical reactions?
The changes do not affect the materials' characteristics/identity
The changes to the materials can be easily reversed.
They created a new substance with different properties.
They changed the shape of the materials.
Tags
NGSS.MS-PS1-2
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Making Elephant Toothpaste
Mario is performing a science experiment to make a substance called "elephant toothpaste". The substance is given this name because it looks like a huge squeeze of toothpaste as it forms. The toothpaste looks much too large to be used by people, but is perfect for an elephant! The materials and procedure Mario will use are shown below.
Materials:
· an empty plastic soda bottle (about 16 oz)
· 1/2 cup of liquid hydrogen peroxide (3% concentration)
· 1 package of yeast
· 1/4 cup of warm water
· dish soap
· a cup
· food coloring
Procedure
Place a few drops of food coloring into the soda bottle with the hydrogen peroxide.
Add a squirt of dish soap and swirl the soda bottle to mix.
In the cup, mix the warm water and yeast and stir for a few seconds to combine.
Pour the yeast mixture into the soda bottle with the hydrogen peroxide.
Record observations as you watch the bottle.
The table below shows some of the observations that Mario makes while the elephant toothpaste is forming.
After the experiment, Mario noticed that the plastic bottle felt warm when touched.
If Mario repeats this experiment, what data will BEST provide further proof that a chemical change has occurred?
The temperature should be taken at the start of the reaction and at the end of the reaction to see if a change in temperature has occurred.
The mass of the yeast should be taken to determine if the warmth of the bottle is coming from a loss in mass because of the yeast.
The temperature of the foam should only be taken at the end of the experiment to determine if the warmth of the bottle is coming from the foam.
The mass of the foam should be taken to determine if the warmth of the bottle is coming from a loss in mass because of the foam.
Tags
NGSS.MS-PS1-2
NGSS.MS-PS1-5
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
John and Gina completed an investigation on physical and chemical change. During the investigation, they added substances together and recorded their observations. They summarized their data in the table.
Using their data, which combination of substances resulted in a physical change?
vinegar and baking soda
sodium chloride and water
calcium chloride and water
sodium chloride and silver nitrate
Tags
NGSS.MS-PS1-2
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