5th grade materials and their properties

Example

Is sugar soluble or insoluble in water?

1. Soluble substances break up into tiny particles that spread through the water, making a clear solution.
2. So the answer is: soluble (dissolves in water)

Answer: soluble (dissolves in water)

Example

Which method is best to separate iron filings from sand?

1. A magnet pulls out magnetic materials such as iron.
2. So the answer is: using a magnet

Answer: using a magnet

Example

Is this change reversible or irreversible: melting butter?

1. A reversible change can be undone, like melting, freezing, dissolving and evaporating.
2. So the answer is: reversible

Answer: reversible

Example

An ice cube of 120 g melts completely in a sealed bag. What is the mass of the water, in g?

1. Mass is conserved in a change of state.
2. So the answer is: 120 g

Answer: 120 g

Example

165 g of water and 15 g of salt are stirred until the salt dissolves. What is the total mass?

1. 165 + 15 = 180
2. So the answer is: 180 g

Answer: 180 g

Example

A mystery material is a grey metal that a magnet attracts. What is it most likely to be?

1. Iron, steel, nickel and cobalt are the common magnetic metals.
2. So the answer is: iron or steel

Answer: iron or steel

Example

Is this a solution or a mixture that is not a solution: sugar in hot tea?

1. In a solution one substance has dissolved evenly into another; you cannot see separate bits.
2. So the answer is: solution

Answer: solution

Example

What is the best way to separate pebbles and sand?

1. Small sand grains fall through the sieve's holes; pebbles stay on top.
2. So the answer is: sieving

Answer: sieving

Example

To test if temperature affects dissolving fairly, what must you keep the same?

1. Change only the temperature; keep everything else the same.
2. So the answer is: the amount of water, the type and amount of sugar, and the stirring

Answer: the amount of water, the type and amount of sugar, and the stirring