WorksheetsMatter NCFE Review
Total questions: 12
Worksheet time: 6mins
Which is an example of a mixture?
iron filings
copper wire
bronze pipe
titanium plate
The chart shows the density of five gases. A gas has a volume of 4.52 L. If its mass is 8.05 g, what is the identity of the gas?
density = mass/volume
helium
neon
argon
krypton
A child fills a bucket with salt water and sand. How are the contents of the bucket classified?
solution
compound
homogeneous mixture
heterogeneous mixture
How are the processes of melting and freezing similar?
They are both processes that physically change a substance.
They are both processes that chemically change a substance.
They are both processes where heat is released by a substance.
They are both processes where heat is absorbed by a substance.
Four different liquids will be separately poured into a single beaker. The liquids are ethanol, milk, oil, and water. The density for each liquid at room temperature is listed in the table below. How will the liquids be arranged from bottom to top in the beaker?
milk, water, oil, ethanol
milk, water, ethanol, oil
water, milk, oil, ethanol
water, oil, ethanol, milk
How does a piece of paper’s ability to be folded in half compare to its ability to burn?
Its ability to be folded is a physical property, while its ability to burn is a chemical property
Its ability to be folded is a chemical property, while its ability to burn is a physical property.
Both are physical properties of the piece of paper.
Both are chemical properties of the piece of paper.
Which substance is most likely classified as a colloid?
soft drink
oxygen gas
water
fog
This graph represents the cooling curve for a pure substance in a liquid state at t = 0 min. Why does temperature remain constant from when t = 2 min to when t = 5 min?
because the substance absorbs heat energy as it changes from a liquid to a solid
because heat energy is released from the substance as it changes from a liquid to a solid
because heat energy is released from the substance as it changes from a liquid to a gas
because the substance absorbs heat energy as it changes from a liquid to a gas
This chart represents the melting points and boiling points of some substances. Which substance is a gas at 45°C?
ethanol
hexane
methane
methanol
This chart lists the densities of various gemstones. A gemstone has a mass of 6.24 g and a volume of 1.98 cm3. What is the identity of the gemstone? density = mass/volume
opal
diamond
garnet
topaz
Which situation provides the best evidence that a chemical reaction is taking place?
a metal strip bends when heated
a solution freezes in the freezer
two solutions mixed in a beaker produce a solid
a chemical completely dissolves in a water and the temperature of the solution remains constant
A teacher wants to demonstrate a chemical reaction to her students. Which activity would best demonstrate a chemical reaction?
placing a metal in an acid to create a gas
measuring the densities of liquid water and ice
melting a solid piece of aluminum
filling a balloon with helium gas
