1.
A ________ property is a characteristic of a pure substance that can be observed without changing it into another substance.
Correct Answer
D. pHysical
Explanation
A physical property is a characteristic of a pure substance that can be observed without changing it into another substance. This means that the substance remains the same even after the observation of its physical properties. These properties include color, shape, size, density, melting point, boiling point, and conductivity among others. They can be measured or observed without any chemical reactions or transformations occurring.
2.
Table salt is an example of a ____________________.
Correct Answer
C. Compound
Explanation
Table salt, or sodium chloride (NaCl), is an example of a compound. A compound is a substance made up of two or more different elements chemically bonded together. In the case of table salt, sodium and chlorine atoms combine to form a stable compound with distinct properties and a fixed ratio of elements. It is not a heterogeneous mixture, which consists of visibly different substances, nor is it an element, which cannot be broken down into simpler substances. A solution, on the other hand, is a homogeneous mixture of two or more substances, and table salt does not fit this description either.
3.
Captain Crunch cereal with crunch-berries is an example of a __________________.
Correct Answer
A. Heterogenous mixture
Explanation
Captain Crunch cereal with crunch-berries is an example of a heterogenous mixture because it is a combination of different components that can be visually distinguished. In this case, the cereal contains different ingredients such as cereal flakes and berry-shaped fruit-flavored pieces, which are not uniformly distributed throughout the mixture.
4.
The air in the classroom right now is an example of _____________________.
Correct Answer
A. Heterogenous mixture
Explanation
The air in the classroom right now is an example of a heterogeneous mixture. This is because air is composed of various gases such as oxygen, nitrogen, carbon dioxide, and others, along with suspended particles like dust, pollen, and water vapor. These components are not uniformly distributed throughout the air, making it a heterogeneous mixture rather than a solution, element, or compound.
5.
Black coffee is an example of a ______________________.
Correct Answer
B. Solution
Explanation
Black coffee is an example of a solution because it is a homogeneous mixture of water and coffee particles. In a solution, the solute (coffee particles) is uniformly distributed in the solvent (water) to form a single phase. This means that the coffee particles are evenly dispersed throughout the water, resulting in a consistent composition and appearance. Therefore, black coffee fits the definition of a solution.
6.
Rusting is an example of a _________________.
Correct Answer
B. Chemical property
Explanation
Rusting is an example of a chemical property because it involves a chemical reaction between iron, oxygen, and water, resulting in the formation of iron oxide. Chemical properties describe how a substance interacts with other substances to form new substances. In the case of rusting, the iron undergoes a chemical change, indicating that rusting is a chemical property.
7.
Water freezing from liquid to ice is an example of a ________________________.
Correct Answer
A. pHysical property
Explanation
Water freezing from liquid to ice is an example of a physical property because it is a characteristic of water that can be observed and measured without changing its chemical composition. The freezing point of water is a specific temperature at which it changes from a liquid state to a solid state, forming ice. This change in state is a physical property because it does not involve any chemical reactions or the formation of new substances.
8.
New substances are always formed when matter undergoes a ____________________.
Correct Answer
D. Chemical change
Explanation
When matter undergoes a chemical change, new substances are always formed. This is because a chemical change involves a rearrangement of atoms and the breaking and forming of chemical bonds. This results in the creation of new substances with different chemical properties than the original matter. In contrast, a physical change only affects the physical properties of matter, such as its shape or state, without creating new substances. Therefore, the correct answer is chemical change.
9.
Atoms that combine to form larger particles are called ____________________.
Correct Answer
C. Molecules
Explanation
Molecules are formed when atoms combine together. Molecules are the smallest units of a substance that retain the chemical properties of that substance. Therefore, molecules are the correct answer as they refer to the atoms that combine to form larger particles. Elements are pure substances made up of only one type of atom. Substances is a general term that can refer to any form of matter. Chemical bonds are the forces that hold atoms together in a molecule, but they are not the actual particles formed.
10.
What is the ratio of Hydrogen (H) to Oxygen molecules in the following chemical formula H3O
Correct Answer
B. 3:1
Explanation
The chemical formula H3O represents a hydronium ion, which consists of three hydrogen atoms and one oxygen atom. Therefore, the ratio of hydrogen to oxygen molecules in this formula is 3:1.
11.
The measurement of the force of gravity on an object is the object’s
Correct Answer
C. Weight
Explanation
Weight is the correct answer because it refers to the force of gravity acting on an object. Weight is dependent on the mass of the object and the acceleration due to gravity. It is a measure of the gravitational force pulling the object towards the center of the Earth. The weight of an object can change depending on the location, as the acceleration due to gravity varies.
12.
The measurement of how much matter an object contains is its
Correct Answer
C. Mass
Explanation
Mass is the correct answer because it is a measure of the amount of matter an object contains. It is different from weight, which is the force exerted on an object due to gravity, and volume, which is the amount of space occupied by an object. The melting point is a characteristic property of a substance, not a measure of the amount of matter in an object.
13.
The measurement of how much mass is contained in a given volume is called
Correct Answer
D. Density
Explanation
Density is the measurement of how much mass is contained in a given volume. It is a property of matter that describes how closely packed the particles are in a substance. The formula for density is mass divided by volume. By calculating density, we can determine if a substance will sink or float in another substance, as objects with higher density than the surrounding fluid will sink, while objects with lower density will float.
14.
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is
Correct Answer
A. 2 g/cm3
Explanation
The density of a substance is calculated by dividing its mass by its volume. In this case, the mass of the wood block is given as 100 grams and the volume is given as 50 cubic centimeters. By dividing the mass (100 grams) by the volume (50 cubic centimeters), we get a result of 2 grams per cubic centimeter (g/cm3). Therefore, the correct answer is 2 g/cm3.
15.
The volume of an irregular object can be measured by
Correct Answer
C. Submerging the object in water in a graduated cylinder.
Explanation
Submerging the object in water in a graduated cylinder is the correct answer because it follows Archimedes' principle. When an object is submerged in a fluid, it displaces an amount of fluid equal to its own volume. By measuring the volume of water displaced by the object in the graduated cylinder, we can determine the volume of the object. This method is particularly useful for irregularly shaped objects that cannot be easily measured using traditional length, width, and height measurements.
16.
Anything that has mass and takes up space is called
Correct Answer
A. Matter
Explanation
Matter refers to anything that has mass and occupies space. It includes both tangible objects and intangible substances like gases and liquids. The other options, density, heterogeneous, and homogeneous, do not encompass the broad definition of matter. Density is a measure of how much mass is contained in a given volume, while heterogeneous and homogeneous refer to the uniformity or lack thereof in the composition of a substance or mixture. Therefore, matter is the correct answer as it encompasses all objects and substances that possess mass and occupy space.
17.
How would you calculate the density of an object?
Correct Answer
B. Divide its mass by its volume.
Explanation
To calculate the density of an object, you need to divide its mass by its volume. Density is defined as the mass of an object per unit volume. By dividing the mass by the volume, you can determine how much mass is packed into a given amount of space. This calculation allows you to compare the compactness or heaviness of different objects, regardless of their size.