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WorksheetsExploring Matter: Changes and Properties
Total questions: 20
Worksheet time: 12mins
A student observes that a piece of iron left outside has developed a reddish-brown coating over time. Which of the following best explains this observation?
The iron has undergone a physical change due to exposure to air.
The iron has undergone a chemical change, forming iron oxide due to rusting.
The iron has absorbed moisture, causing it to expand.
The iron has melted due to high temperatures.
Which of the following scenarios best illustrates a chemical change?
Melting ice to form water.
Dissolving sugar in water.
Burning wood to form ash and smoke.
Cutting a piece of paper into smaller pieces.
A student is given a task to identify a pure substance based on its chemical properties. Which of the following properties should the student consider?
pH and flammability
Melting point and boiling point.
Mass and volume.
Shape and size.
Which of the following is an example of a physical change?
Baking a cake.
Rusting of iron.
Freezing water to form ice.
Burning gasoline in an engine.
A student observes that a candle burns and produces heat and light. Which evidence supports that a chemical change has occurred?
The candle wax melts.
The candle wick becomes shorter.
The production of heat and light.
The candle changes shape.
Which of the following best describes why a material's flammability is considered a chemical property?
It involves a change in the material's state.
It describes the material's ability to conduct electricity.
It involves a transformation into new substances when burned.
It is related to the material's density.
A student mixes vinegar and baking soda in a closed container and observes the formation of gas bubbles. What conclusion can be drawn from this observation?
A physical change has occurred, as the substances are mixed.
A chemical change has occurred, as new substances are formed.
The substances have dissolved in each other.
The temperature of the mixture has decreased.
A student observes that a metal object has become dull and has a greenish layer on its surface after being exposed to air and moisture. What type of change has occurred?
Physical change, as the metal's appearance has changed.
Chemical change, as a new substance has formed on the metal's surface.
Physical change, as the metal has expanded.
Chemical change, as the metal has melted.
Which of the following best explains why the tendency to rust is considered a chemical property of a material?
It involves a change in the material's color.
It involves a change in the material's mass.
It involves a reaction with oxygen to form a new substance.
It involves a change in the material's temperature.
How do you know a chemical change has occurred?
A precipitate is formed.
The shape has changed.
The state of matter has changed
Electricity can be conducted through the products.
During a chemical change, heat can be given off. This is called-
exothermic reaction
endothermic reaction
physical change reaction
melting
During a chemical change, heat csan be absorbed, making the reaction container feel cold. This is called-
exothermic reaction
endothermic reaction
physical change reaction
boiling point
A solution in chemistry means-
solvent
elements and compounds
mixture of two or more substances not chemically bound together
solute
One particle of table salt (NaCl) is best described as a (a) .
A solute is
2 or more items mixed together
a dissolved substance
chemically bound together elelemts
chemical property
Which of the following is not a chemical change?
seltzer tablet in water
chopping vegetables
digestion of food
baking bread
Which of the following has gone through a chemical change?
torn paper
an apple being eaten
smashing a banana
broken window
