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WorksheetsReviewing Density and Changes in Matter
Total questions: 20
Worksheet time: 10mins
Copper is added to a solution of nitric acid. The solution becomes hot and changes from colorless to blue. What is the best explanation for the change in temperature?
The blue color absorbs less energy, which causes heat to be released.
The increased volume of the solution causes heat to be released.
The chemical reaction between the copper and nitric acid produces heat.
The copper and nitric acid repel each other, which produces heat.
Jelena is studying the properties of water. She finds that a sample of 100 mL distilled water boils at 100°C and has a density of 1 g/mL. What will Jelena most likely find to be true about a sample of 200 mL distilled water?
It will boil at 200°C and have a density of 2 g/mL
It will boil at 100°C and have a density of 1 g/mL
It will boil at 200°C and have a density of 1 g/mL
It will boil at 100°C and have a density of 2 g/mL
Over time an iron nail reacts with water to produce iron oxide, or rust. Which of the following is a signal that rusting has taken place?
The appearance of sparks.
The release of an odor in the presence of bubbles.
The release of heat and steam at the area where the mixture occurred.
A color change on the nail from silver to reddish-brown.
Abner is researching the physical properties of pure copper. He makes this table using the data he finds. What could Abner conclude from his findings?
Decreasing the mass of copper decreases the melting point of copper.
Decreasing the mass of copper increases the density of copper.
Increasing the mass of copper always changes the color of copper.
Increasing the mass of copper does not change the physical properties of copper.
Of the following processes in nature, which one involves only a physical change?
A bird digests a worm.
Photosynthesis occurs in a leaf.
An earthquake causes a rock slide.
A chunk of iron ore rusts.
WHich of the following items would have the highest density?
A 6 cm3 block of ice with a mass of 4 grams
A 12 cm3 block of aluminum with a mass of 2 grams
A 2 cm3 block of lead with a mass of 11 grams
A 12 cm3 block of wood with a mass of 3 grams
A student is given a small sample of a pure solid substance. She is asked to identify the substance based on a particular property. Which property, if determined accurately, would best help her identify the substance?
its mass
its volume
its temperature
its density
When a small piece of white marble rock is carefully placed in a beaker of hydrochloric acid, bubbles form on the surface of the rock and rise to the top of the liquid.
Which conclusion best fits this observation?
The rock dissolved in the acid by breaking into its smallest pieces
The rock reacted with the acid and made a new gaseous substance
The rock heated the acid until it began to boil
The rock was changed by the acid into its gaseous form.
Which of the following is a chemical change?
a rock eroding as the wind removes particles from it
soil drying as water evaporates
a solution of salt water being diluted as water is added to it
silver tarnishing as the silver metal reacts with sulfur
Density is a measurable property of matter. How can the density of a substance be determined?
Measure the length and weight of the substance, then multiply the length by the weight
Measure the mass and volume of the substance, then divide the volume by the mass.
Measure the length, width, and height of the substance, then multiply the values together
Measure the mass and volume of the substance then divide the mass by the volume
Which of the following is an example of a chemical change?
Chocolate squares are melted to make cake icing
Flour and sugar are sifted together into a measuring cup
The shell of an egg breaks when it is struck against a hard surface
A mixture of flour, sugar, eggs, and butter is baked to become a cake
These pictures represent the particles of a material. In which picture is the density of the material the greatest?
Box A
Box B
As part of a science experiment, Jose did a test for starch on a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato.
Why did the iodine change color on the potato?
The iodine evaporated into a gas.
The iodine burned the potato and turned it to ash.
The iodine mixed with the colors of the potato so it looked black
The iodine reacted with the potato to form a new substance
When plants and animals die, their bodies are decomposed by organisms such as bacteria or fungi. Which statement is true regarding the decomposition process?
Decomposition is a physical change because the identity of the dead plant or animal does not change
Decomposition is a chemical change because the identity of the plant or animal does not change.
Decomposition is a physical change because the organism is broken down into new substances.
Decomposition is a chemical change because the organism is broken down into new substances.
These diagrams represent the particles of a material. In which diagram is the density of the material the greatest?
Cube A
Cube B
Cube C
Cube D
A plant uses the energy from sunlight to create oxygen and glucose from carbon dioxide and water. Which statement is true about the changes that have occurred?
A chemical change has occurred because new compounds have been produced.
A physical change has occurred because the plant looks different.
A chemical change has occurred because energy was needed.
A physical change has occurred because the substances are still gases.
Baking soda and vinegar can be used to model a volcanic eruption in a science demonstration because they bubble violently when mixed. What can be concluded about mixing vinegar and baking soda?
Vinegar boils when it comes in contact with baking soda.
Baking soda has a lower density than vinegar.
Baking soda and vinegar make a uniform mixture.
Vinegar and baking soda react to form a new gaseous substance.
Marcus has a piece of metal. He knows that the metal is either made of pure zinc or a mixture of zinc and iron. What property could he easily measure in the lab to help him determine whether the metal is pure zinc?
solubility
shape
density
boiling point
Pure sodium metal explodes when it makes contact with water. In its natural state, chlorine is a deadly, poisonous gas. When these two chemicals combine, they form a harmless, white powder known as sodium chloride or table salt. Which of the following statements does this information support?
The properties of substances change during chemical reactions but then later go back to their original condition.
Heat must be added in order to change the chemical properties of substances.
When substances are chemically combined, the properties of the new substances that are formed are often different from the properties of the original substances.
When substances are chemically combined, the properties of the new substances that are formed are the same as the properties of the original substances.
A 20 gram sample of helium at room temperature is placed into a closed container that holds 8 mL. If later the 20 g of helium is transferred into a 16 mL closed container, which of the gas's properties will change?
color
number of atoms
mass
density
