1.
Which property of matter is a measure of the gravitational force?
Correct Answer
D. Weight
Explanation
Weight is a measure of the gravitational force acting on an object. It is the force with which an object is pulled towards the center of the Earth or any other celestial body. Weight depends on the mass of the object and the acceleration due to gravity. It is different from mass, which is a measure of the amount of matter in an object. Density is the mass of an object divided by its volume, and volume is the amount of space occupied by an object. Therefore, weight is the correct answer as it directly relates to the gravitational force.
2.
In a graduated cylinder containing several liquid layers, the least dense liquid is found
Correct Answer
A. Floating at the top
Explanation
The least dense liquid is found floating at the top because density is a measure of how much mass is contained in a given volume. The least dense liquid will have fewer particles packed closely together, resulting in a lighter mass per unit volume. As a result, it will be less dense than the other liquids and will float on top of them.
3.
How is a physical change different from a chemical change?
Correct Answer
A. The change is reversible in a pHysical change
Explanation
A physical change is different from a chemical change because it is reversible. This means that the original substance can be restored after the change has occurred. In contrast, a chemical change results in the formation of a new substance with different properties, and it is usually not reversible.
4.
Melting candle wax would be an example of
Correct Answer
B. pHysical change
Explanation
Melting candle wax is an example of a physical change because it involves a change in the physical state of the substance without altering its chemical composition. The wax changes from a solid to a liquid when heated, but its molecular structure remains the same. This can be reversed by cooling the liquid wax, demonstrating that no new substances are formed during the process. Therefore, melting candle wax is considered a physical change rather than a chemical change.
5.
Which of the following units would be best for describing the volume of mercury (liquid) used in an experiment?
Correct Answer
C. Liters or milliliters
Explanation
The volume of a liquid, such as mercury, is best described using units of liters or milliliters. Grams and kilograms are units of mass, not volume. Meters and centimeters are units of length, not volume. Newtons are units of force, not volume. Therefore, the most appropriate units for describing the volume of mercury in an experiment would be liters or milliliters.
6.
Which of the following is not a sign of a chemical change?
Correct Answer
B. Change in state
Explanation
A change in state is not a sign of a chemical change because it is a physical change. A change in state refers to a substance transitioning from one phase to another, such as from a solid to a liquid or a gas. This change does not involve the alteration of the substance's chemical composition or the formation of new substances. In contrast, the other options mentioned - change in color or odor, foaming or bubbling, and production of heat or light - are all indicators of a chemical change, as they involve the transformation of the substance's chemical properties.
7.
What chemical property is responsible for iron rusting?
Correct Answer
C. Reactivity with oxygen
Explanation
Iron rusting is a chemical reaction that occurs when iron reacts with oxygen in the presence of water or moisture. This reaction forms iron oxide, commonly known as rust. Therefore, the chemical property responsible for iron rusting is its reactivity with oxygen.
8.
To move a ball that has a mass of 150g would be more difficult than moving a ball with a mass of 50g because the ball with the mass of 150 g gas
Correct Answer
C. More mass than the 50g ball
Explanation
The correct answer is "more mass than the 50g ball." Mass is a measure of the amount of matter in an object, and it determines the inertia of the object. Inertia is the resistance of an object to changes in its motion. The ball with a mass of 150g has more matter packed into it compared to the ball with a mass of 50g. Therefore, it would be more difficult to move the ball with more mass because it has more inertia.
9.
What unit of density would be appropriate to describe a solid bar of silver?
Correct Answer
B. G/cm^3
Explanation
This unit measures the mass of silver per unit volume, which is commonly used for solids. Silver is typically denser than water, so its density is expressed in grams per cubic centimeter (g/cm³).
10.
Which physical property of matter describes the relationship between mass and volume?
Correct Answer
C. Density
Explanation
Density is the physical property of matter that describes the relationship between mass and volume. It is a measure of how much mass is contained within a given volume of a substance. Density is calculated by dividing the mass of an object by its volume. Different substances have different densities, and it can be used to identify and classify materials.
11.
Souring milk is an example of
Correct Answer
D. Chemical change
Explanation
Souring milk is an example of a chemical change because it involves a chemical reaction. When milk sours, the lactose in the milk is converted into lactic acid by bacteria. This change in composition and the formation of a new substance (lactic acid) is characteristic of a chemical change.
12.
Malleability is an example of a
Correct Answer
A. pHysical property
Explanation
Malleability is the ability of a substance to be deformed or shaped under compression without breaking or cracking. This property is a characteristic of the material itself and does not involve any change in its chemical composition. Therefore, malleability is considered a physical property.
13.
Explain why volume and mass are not characteristic properties of matter, but density is.
14.
Why is density a useful property of identifying matter?
15.
After a tree is cut down with a chain saw, it is impossible to put the tiny wood chips back together. The process cannot be reversed. Does this mean that cutting a tree with a chainsaw causes a chemical change in the wood? Explain why or why not.
16.
Summarize the differences between mass and weight.
17.
A graduated cylinder contains 4 liquids in 4 separate layers. One liquid is water. The purple liquid has a density of 1.62 g/cm . The yellow liquid has a density of 0.46g/cm . The red has a density of 0.91g/cm . What is the order of the liquids in the cylinder bottom to top? Explain your answer. What would happen if you slipped a small chip of wood (0.85g/cm ) into the cylinder?
18.
Find the density of a substance that has a mass of 75g and a volume of 25cm . Make sure you show your work and include ALL UNITS.
19.
Suppose you have a ball with a volume of 43cm . You place the ball on a triple beam balance and find that it has a mass of 65g. What would the density of the ball be? Show work and label ALL UNITS.
20.
You place an unknown object into a graduated cylinder and it displaces 23mL of water. you take the object out, dry it off, and place it on a triple beam balance. You find that this unknown object has a mass of 20 g. What would the density of the unknown object be? (Show work and ALL UNITS) Would this unknown object float or sink in syrup (syrups density is 1.43g/cm )?