Topic 8 How to name a material from its properties — what needs James (16)

Topic 8 · How to name a material from its properties · Type 1 · tests MAT5-003

EasyMCQType 1 — what a digital scale's reading does when air is pumped in, let out, or nothing changes

A flat scooter tire lies on a digital scale, and a girl pumps it full of air. What does the reading do?

1. a) It goes up. ← key
2. b) It stays the same.
3. c) It goes down.
4. d) It goes to 0 grams.

Why it is this type: A gas has mass, even though you cannot see it. The air pumped into the float is a gas. So the float's mass goes up, and the reading goes up.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 2 · tests MAT5-003

EasyMCQType 2 — which sentence about unseen air (in a pumped bed; in a tin that looks empty) is true

A camping air bed is pumped full of air. Which sentence about the air inside it is true?

1. a) The air inside has no mass.
2. b) The air inside has mass only when the bed is squeezed.
3. c) The air inside has mass. ← key
4. d) The air inside has mass only when it is cold.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 3 · tests MAT5-003

EasyMCQType 3 — what made a reading go up; a full tank against an empty one; which tire's air has more mass

A diver's tank is filled with air from a pump. Compared with the empty tank, the full tank has…

1. a) more mass ← key
2. b) less mass
3. c) the same mass
4. d) no mass

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 4 · tests MAT5-003

HardMCQType 4 — the air's mass from two readings; the reason a pumped ball has more mass; the reading after half the air is let out; the air's mass typed with its unit

A flat ball has a mass of 300 grams. Pumped full, it has a mass of 306 grams. Then half of the air is let out. Which reading could the scale show now?

1. a) 306 grams
2. b) 303 grams ← key
3. c) 300 grams
4. d) 312 grams

Why it is this type: The air inside has mass: 306 grams − 300 grams = 6 grams of air. Half of the air is let out, so half of its mass leaves: 3 grams. The new reading is the difference: 306 grams − 3 grams = 303 grams. Hard because: two ideas chained.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 5 · tests MAT5-001

EasyMCQType 5 — what a named material does when stirred into water (dissolves; settles), including every-piece cases

A spoonful of salt is stirred into a pot of soup. What does the salt do?

1. a) It dissolves. ← key
2. b) It settles on the bottom as grains.
3. c) It floats on the top.
4. d) It melts.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 6 · tests MAT5-001

EasyMCQType 6 — a true sentence about glitter in water; the word for breaking into pieces too small to see and spreading

A pinch of glitter is stirred into a glass of water, and the glitter is still there as shiny bits. Which sentence about glitter is true?

1. a) Glitter dissolves in water.
2. b) Glitter dissolves only in warm water.
3. c) Glitter does not dissolve in water. ← key
4. d) Glitter dissolves only when stirred for longer.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 7 · tests MAT5-001

MediumMCQType 7 — the reason sugar vanishes; Ines's melt claim — what happened to the salt; which powder could settle; what decides dissolving; a finer powder of a settling material; the term typed

Ines says the salt melted as it vanished in cold water, but she is wrong. What happened to the salt?

1. a) It dissolved into pieces too small to see. ← key
2. b) It melted into liquid salt.
3. c) It turned into water.
4. d) It sank out of sight under the spoon. Belief: the MAT5 register, SD-1 ("solids dissolve because they melt in the water"); the lesson line: "Melting needs heat … The cold water did not heat the sugar, so the sugar did not melt."

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 8 · tests MAT5-002

MediumMCQType 8 — sinks → heavier than the same size of water / more dense; floats → lighter / less dense; the word density; two cups on two scales (figure) → heavier or lighter

Both cups are the same size and filled to the top. Ice is…

1. a) heavier than the same size of water
2. b) lighter than the same size of water ← key
3. c) exactly as heavy as the same size of water
4. d) heavier than every other material

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 9 · tests MAT5-002

HardMCQType 9 — what a lump does, read from two cups (figure); the heavy-but-floats trap; size does not change it; a close pair of readings; Hollis's light-paper-clip claim — the correct reason; same-size blocks → which has more mass; density typed

Hollis says a tiny steel ball will float in water because it is so light. Hollis is wrong. What is the correct reason?

1. a) Steel is more dense than water at any size. ← key
2. b) Steel floats only when the piece is big.
3. c) Light things always sink in water.
4. d) The ball is too smooth to float. Belief: Grade 4 Topic 13's register (a tiny piece floats because it is light) and MAT5-002's cross note (heavy for its size is not the same as heavy); the lesson's scene (the heavy log floats, the light bolt sinks).

Why it is this type: Hard because: a documented claim judged by its correct reason against three overstatements.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 10 · tests MAT5-004

HardMCQType 10 — a true sentence about look-alikes; the first step; name the material from one or two results; which rows one test crosses out; which test tells two apart; three results chained; the table that has no separating column; Imani's look-alike claim — the correct reason

A lump sinks in water, and a magnet pulls it. In the table, steel and iron are both left. Which of these is true?

1. a) The table has no property that tells them apart. ← key
2. b) The water test tells them apart.
3. c) The magnet test tells them apart.
4. d) The lump must be steel, because steel comes first.

Why it is this type: Hard because: the routine is judged at its limit.

Recommendation: Approve as the exemplar

Topic 8 · How to name a material from its properties · Type 11 · tests MAT5-004

HardMCQType 11 — the TWO materials one test crosses out

Mystery grains do not dissolve in water. Select the TWO materials in the table that can be crossed out.

1. a) sugar ← key
2. b) baking soda ← key
3. c) sand
4. d) crushed shell

Why it is this type: Hard because: a set is held together.

Recommendation: Approve as the exemplar