LA 4 - How can substances be identified? Formative Quiz

The property reflectivity describes how

• A. easily a material can get scratched.
• B. much light bounces off a material.
• C. difficult it is to shape an object.

A difference between copper and plastic is that copper has a much higher

• A. brittleness.
• B. solubility.
• C. reflectivity.
• D. electrical conductivity.

Which of the following properties is an example of a substance changing into a new substance?

• A. wood that is burned
• B. gold that is scratched
• C. iron pyrite that is broken
• D. sugar that is dissolved

Stella works at a warehouse that stocks household items. Unfortunately, she forgot to label some of the white powders that the warehouse has in stock. Stella knows that she has face powder, flour, powdered laundry soap, and powdered sugar, but she doesn’t know which powder is which. Which is the BEST way that Stella could go about identifying each powder if she knows about each substances’ properties?

• A. take a spoon and taste each of the powders
• B. heat up each powder
• C. observe the shape of each grain of powder under a magnifying glass
• D. give up because it is impossible for her to determine which powder is which

Fred is building a machine in his garage. Which would be the best material for him to use if he wants his machine to have both high thermal and electrical conductivity?

• A. glass
• B. copper
• C. wood
• D. plastic

Liam woke up this morning with an upset stomach, so his dad gives him an antacid tablet to help him feel better. Liam observes that adding the antacid tablet to a glass of water causes it to fizz. What property is the fizzing evidence of?

• A. brittleness
• B. electrical conductivity
• C. thermal conductivity
• D. ability to change into new substances

Liam woke up this morning with an upset stomach, so his dad gives him an antacid tablet to help him feel better. Liam observes that adding the antacid tablet to a glass of water causes it to fizz. What property is the fizzing evidence of?

• A. brittleness
• B. electrical conductivity
• C. thermal conductivity
• D. ability to change into new substances

• A. I, II
• B. II, III
• C. I, II, III
• D. II, III, IV

A substance’s _____________ is whether it can be shaped or not.

• A. hardness
• B. conductivity
• C. brittleness
• D. reflectivity

Plastic usually covers power cords because

• A. plastic has a low thermal conductivity.
• B. plastic has a low electrical conductivity.
• C. plastic has a high thermal conductivity.
• D. plastic has a high electrical conductivity.