Year 9 Science – Solutions and Mixtures 1
Practise two-step density calculations, solubility data, saturation, concentration and planning multi-step separations. 20 questions. 25 minutes.
Choose the word that completes each blank.
A large log floats while a small steel nail sinks. The log has 1 density than water and the nail has 2 density than water.
Blank 1: higher · the same · lower
Blank 2: lower · higher · the same
Choose the word that completes each blank.
As steam condenses on a cold window, its particles move 1 and the attractive forces between them become 2 effective at holding them together.
Blank 1: more slowly · at the same speed · more quickly
Blank 2: less · equally · more
Circle 1 word in the sentence below.
Aboriginal and Torres Strait Islander Peoples toss seeds in a coolamon in the wind. Click the word that names what the wind carries away.
grainhuskscoolamonwind
A student finds the density of a rock by displacement, but air bubbles cling to the rock under the water. What effect will this have on the calculated density?
Choose the word or phrase that completes each blank.
When salt dissolves in water, the salt particles 1 among the water particles, and the mass of the solution is 2 the combined mass of the salt and water.
Blank 1: are destroyed · spread out evenly · sink together
Blank 2: equal to · less than · greater than
Choose the word that completes each blank.
A sample contains only identical groups, each made of one carbon atom joined to two oxygen atoms. The sample is a 1, so it can only be broken down by a 2 change.
Blank 1: mixture · compound · element
Blank 2: chemical · physical · magnetic
A student stirs sugar into 100 mL of water at four temperatures until no more dissolves. Which conclusion do the data support?
| Temperature (°C) | Spoonfuls of sugar dissolved |
|---|---|
| 20 | 9 |
| 40 | 11 |
| 60 | 14 |
| 80 | 18 |
A burner keeps heating a beaker of melting ice, but the thermometer stays at 0 °C for several minutes. What is the added energy doing?
A pencil line is drawn near the bottom of chromatography paper and four dyes are placed on it. Which dye was most soluble in the solvent?
Circle 2 words in the sentence below.
A student tests how water temperature affects the mass of sugar that dissolves. Click the two variables that must be kept the same.
volume of waterwater temperatureamount of stirringspoonfuls dissolved
A metal bolt has a mass of 81 g. It is lowered into a measuring cylinder and the water level rises from 50 mL to 80 mL. What is the density of the metal?
Choose the word or phrase that completes each blank.
At 20 °C the most sugar that can dissolve in 100 mL of water is 200 g. Solution A has 2 g dissolved and solution B has 40 g dissolved. B is 1 than A, but B is still 2.
Blank 1: less concentrated · equally concentrated · more concentrated
Blank 2: unsaturated · saturated · supersaturated
A student dissolves 15 g of salt in 135 g of water. What is the concentration of the solution in % w/w?
A hot saturated sugar solution is cooled carefully and stays clear. When one sugar crystal is dropped in, crystals suddenly form throughout it. Which describes the cooled solution before the crystal was added?
Choose the word or phrase that completes each blank.
Ethanol boils at 78 °C and water at 100 °C. When a mixture of the two is slowly heated to 80 °C, mostly 1 boils off and the liquid collected is the 2.
Blank 1: water · both equally · ethanol
Blank 2: residue · distillate · filtrate
Circle 2 words in the sentence below.
50 g of each solute is stirred into 100 mL of water at 20 °C. The most that dissolves (g per 100 mL) is: P 36, Q 204, R 2, S 90. Click the two solutes that leave undissolved solid.
PQRS
At a refinery, crude oil is separated into petrol, diesel and bitumen in a tall tower. Which property difference does this separation rely on?
A student compares gravel, sand and charcoal as water filters by pouring polluted water through each one. Which should be the same for all three filters to make it a fair test?
A solid iron block measures 5 cm × 4 cm × 2 cm. The Data Book gives the density of iron as 7.9 g/cm³. What is the mass of the block?
A mixture contains iron filings, sand and salt. Which sequence separates all three?