PS.5.1.2 (5.P.2.3) #1: Schoolnet

Sodium bicarbonate is commonly known as baking soda. Sodium bicarbonate is a

white solid that can dissolve in water. Under the proper conditions, sodium bicarbonate can release carbon dioxide gas. Which of the following is NOT a physical property of sodium bicarbonate?

• It is white.

• It is a solid.

• It can dissolve in water.

• It releases carbon dioxide.

Physical and chemical properties can be used to classify substances. Which of these shows a chemical property?

• Silver melts.

• Magnesium burns.

• Sulfur is a yellow solid.

• Aluminum conducts heat.

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One type of cold remedy is an effervescent tablet that breaks down in water. When the tablet is placed in water, it forms gas bubbles. In this example, the formation of a gas

• is a physical property.

• occurs when adding water to acid.

• is a sign of a chemical change.

• occurs when the water boils.

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Which is a chemical change?

• frying an egg

• boiling water

• breaking a glass cup

• crushing a piece of bread

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Which of the following is an example of a chemical change?

• clouds forming

• sugar dissolving

• water freezing

• a candle burning

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Campers burned logs in a campfire.

How would the campers know that a chemical change has taken place?

• The logs changed shape.

• The rocks glowed when heated.

• The wood became a different substance.

• The ground absorbed heat from the coals.

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Which action causes a chemical change?

• leaves dropping from a tree

• leaves blowing in the wind

• leaves being burned in a fire

• leaves being crushed into pieces

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Which is a way that a piece of paper can go through a chemical change?

• fold the paper in half

• soak the paper in water

• burn the paper with fire

• cut the paper with scissors

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A student placed an egg in a container of vinegar.

Bubbles formed on the shell of the egg, and after three days, the shell was gone. Which observation made by the student indicated a chemical change took place?

• The bubbles were produced as the shell reacted with the acid.

• The vinegar solution remained clear.

• The temperature of the vinegar remained the same.

• The shape of the egg remained oval.

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Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?

• chemical

• mechanical

• nuclear

• physical

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