Unit 6-Physical and Chemical Changes

Unit 6-Physical and Chemical Changes

Multiple Choice

Which observation is an indication that a

chemical change has occurred?

• The loss of water in a container over time.

• The rusting of a pipe after it has been left in

  water.

• The absence of an odor from a metal pipe sitting

  in water.

• The change in temperature of water with a metal

  pipe in it.

Multiple Choice

Anna's Dad cleans the house with homemade

cleaning liquids. One day, she was watching him. He

mixed vinegar with baking soda in a container. The

mixture started to create foam and bubble.

Which of the following BEST describes what

Anna observed?

• a chemical change that produced a gas

• a chemical change that produced a solid

• a physical change that produced a new

  substance

• a physical change that produced a different

  volume

Multiple Choice

Anton decides to conduct scientific investigations on

many common household items. He creates a table to

track his investigations and observable findings.

Which of Anton's investigations resulted in a chemical change?

• crushed ice

  cubes in a

  blender

• rubbed

  sandpaper

  on a

  wooden block for five

  minutes

• left milk out at

  room temperature

  for five days

• left an ice

  cube out on

  the kitchen

  table at room

  temperature

  for eight hours

Multiple Choice

Justin performed an experiment and wrote down the steps and observations.

Which statement correctly explains the results of Justin's experiment?

• A physical change occurred, because the

  vinegar evaporated into a gas.

• A chemical change occurred, because the

  vinegar evaporated into a gas.

• A physical change occurred, because a gas was

  created when the baking soda and vinegar

  mixed together.

• A chemical change occurred, because a gas

  was created when the baking soda and vinegar

  mixed together.

Multiple Choice

Jarrett placed a pot on the stove and turned the

heat on under the pot. As the temperature

increased, the amount of steam coming from the

pot increased. What change in state is occurring?

• condensation

• evaporation

• freezing

• melting

Multiple Choice

Mr. Johnson’s science class is studying matter.

It’s “Fun Food Friday” and he wants to find a food

related activity that would demonstrate a physical

change.

Which activity should Mr. Johnson choose?

• boiling eggs

• baking cookies

• making waffles

• melting juice bars

Multiple Choice

Nathan and Nancy were conducting an

investigation. They mixed two solutions labeled

Part A and Part B together as directed by their

teacher.

What evidence should Nathan and Nancy record

in their data table to prove that a chemical

change has occurred?

• Bubbles formed after Part A and Part B were

  mixed together.

• A brown solid formed at the bottom of the

  beaker after Part A and Part B were mixed

  together.

• A brown solid formed at the bottom of the

  beaker and bubbles formed after Part A and Part

  B were mixed together.

• The temperature increased, a brown solid

  formed at the bottom of the beaker, and bubbles

  formed after Part A and Part B were mixed

  together.

Multiple Choice

Kirby completed an investigation that caused a

chemical change and a product was formed.

Which investigation could Kirby have completed?

• Kirby mixed a solid into a liquid until the solid

  dissolved.

• Kirby mixed two liquids together, and they mixed

  together completely.

• Kirby combined two solids together in a mixture

  that could be taken apart.

• Kirby mixed two liquids together, and a solid

  formed when they were mixed together.

Multiple Choice

Sam places a glass of ice cubes on the counter. He

measures the temperature of the ice. It measures 30

degrees Fahrenheit. He leaves the glass sitting out

overnight. In the morning, there is liquid in the glass.

Sam measures the temperature. The substance

measures 70 degrees Fahrenheit.

What conclusion can Sam make based on this

evidence?

• As the temperature increased, there was a

  physical change from a solid to a liquid.

• As the temperature increased, there was a

  chemical change from a solid to a liquid.

• As the temperature increased, there was a

  chemical change that released a gas from a

  liquid.

Multiple Choice

Latasha wanted to conduct an investigation to

produce a chemical change.

Which of the following can Latasha use to

provide evidence that a chemical change

occurred during her investigation?

• The change can be reversed.

• A new substance will be created.

• The investigation will result in a change of

  shape.

• There will be a change of state from a solid to a

  liquid.

Multiple Choice

Which of the following is a characteristic of a

physical change of matter?

• The change creates a new substance.

• The change requires a chemical reaction.

• The change requires increased temperature

• The change creates a different form of the

  existing substance.

Multiple Choice

In class, Johari and Micah observed Ms. Miller’s

experiment with water. She started with an ice

cube, heated it up to boiling, and then she

removed the heat source. She claimed that

physical changes to the state of water had taken

place.

Which observation could be used in an argument

to support Ms. Miller’s claim?

• The ice changed from a solid to a gas as the

  heat energy decreased.

• The ice changed from a solid to a liquid as the

  heat energy decreased.

• The ice melted, changing from a solid to a liquid

  as the heat energy increased.

• The ice boiled and changed from a gas to a

  liquid as the heat energy increased.

Multiple Choice

Tyrone claims that physical changes in the state

of water are caused by changes in temperature.

To test his claim, Bethany put an ice cube in a

glass on the counter in their classroom. Every

hour they recorded their observations in their

science journals.

Based on their observations, which argument

BEST describes the validity of Tyrone’s claim?

• Tyrone is incorrect because the temperature in

  the room did not change.

• Tyrone is incorrect because he did not use a

  burner to add heat to the ice cube.

• Tyrone is correct because the warmer

  temperature in the room caused the ice to melt.

• Tyrone is correct because all physical changes

  are caused by changes in temperature.

Multiple Choice

Mr. Elton was teaching his class about physical and

chemical changes. As part of his instruction, he

brought an electric toaster to class and demonstrated

what happened when a piece of bread was placed

inside and heated. After the demonstration, he asked

his students to visit the class blog to post their

observations.

Which student provided the BEST observation to

support his or her thinking about the change that

occurred when Mr. Elton made toast?

• Penny:Toasting the bread created a chemical change and a new substance because the brown parts will not turn white again

• Jonas: It was physical because it was still just bread.

• Liam: It created a physical change because the bread felt harder when it came out of the toaster.

• It was a chemical change because it felt warm.

Multiple Choice

Mrs. Robertson gave each of her students a

piece of paper and a hand lens and asked them

to plan an investigation that would change the

paper chemically.

• Carrie-crumple paper and observe

• Ernest-dip paper in fruit juice and observe

• Jenny-focus a beam of sunlight and observe the paper burning

• Michael-Cut a hole in the paper after folding and then fold

Multiple Choice

Bianca received one red t-shirt and one blue tshirt.

She placed the red one in a sealed plastic

bag with one cup of bleach. She placed the blue

one in a sealed plastic bag with one cup of water.

She checked on the t-shirts one hour later.

What observation did Bianca make that indicated

a chemical change had taken place?

• The red t-shirt was wet indicating a chemical

  change had occurred.

• The red t-shirt had changed color indicating a

  chemical change had occurred.

• The blue t-shirt was wrinkled indicating a

  chemical change had occurred.

• Both t-shirts were still t-shirts indicating that no

  new substance was produced and no chemical

  change had occurred.

Multiple Choice

George dissolves a spoonful of sugar into a small

cup of water. He wants to know if this is a

physical change.

Which is the BEST way for George to determine

if this was a physical change?

• Leave the cup alone until all of the water has

  evaporated.

• Pour the sugar water through a filter to see if the

  sugar collects.

• Taste the water before and after dissolving to

  see if it tastes sweeter.

• Mix a second spoonful of sugar into another cup

  of water and compare.

Multiple Choice

Miss Wilson likes to let her science class explore

different concepts through cooking on Fun Food

Friday. This week, she breaks her students into

groups and gives them the materials and recipe

they need to make a cake.

• Beat together buttern and sugar with a hand mixer until creamy

• Beat the eggs and stir in the vanilla

• Combine flour and baking powder with the buttern and egg mixturen and mix well. Add milk until batter is smooth

• Pour batter into pan. Bake for 30-4- minutes until cake rises and springs back when touched.

Multiple Choice

Ellen filled a cup of water on Saturday morning

and left it alone for a few days. When she looked

at in again on Tuesday, the water level had

changed.Where did Ellen MOST LIKELY leave the cup of

water?

• She left it in the freezer, and the cool air froze

  the water causing it to shrink.

• She left it on her sunny front porch, and the heat

  from the sun evaporated the water.

• She left it on the bathroom counter, and the

  steam from the shower caused the water to

  evaporate.

• She left it in on her coffee table near the air vent,

  and the warm air caused the water to condense

  outside of the glass.

Multiple Choice

Mr. Russell began a science lesson by giving each

student a small bottle of water. He asked each

student to taste the water. Then he gave each student

one tablespoon of instant tea to put in their water

bottle. He instructed the students to close the top and

shake the bottle. Then he asked his students to once

again taste their water. After tasting the water,

students were asked to explain what type of change

had occurred.

Which of the following is the BEST explanation of

the type of change that occurred?

• The change to the water was a chemical change

  because the appearance of the water changed.

• The change to the water was a chemical change

  because the water no longer tasted the same.

• The change to the water was a physical change

  because the amount of water in the bottle was

  still the same.

• The change to the water was a physical change

  because the water and tea were mixed, but no

  new substance was formed.