Chemistry Questions On Mixtures! 7th Grade Trivia Quiz

The correct answer is "Two or more substances mixed together." This explanation is based on the definition of a mixture, which is a combination of two or more substances that are not chemically bonded together. In a mixture, the substances retain their individual properties and can be separated through physical means. Therefore, a mixture is not a pure substance but rather a combination of different substances.

Strong Acid- closest to pH 0
Weak Acid- closest to pH 7 (neutral)
Strong Base- closest to pH 14
Weak Base- closest to pH 7 (neutral)

The molecules in a gas have high kinetic energy, causing them to move rapidly in random directions. This constant motion allows them to spread out and occupy the entire available space within a container. As a result, gases do not have a fixed shape or volume and can easily fill any container they are placed in. Therefore, the statement that the molecules in a gas move fast and spread out to fill the entire container is true.

An object will float in a fluid if its density is lower than that of the fluid. This is because the buoyant force exerted by the fluid on the object is greater than the gravitational force pulling the object down. As a result, the object will experience an upward force that causes it to float on the surface of the fluid.

If an object has a greater density than the fluid it is placed in, it will sink. This is because the weight of the object is greater than the buoyant force exerted by the fluid, causing it to sink downwards.

In a solid, the molecules are tightly packed together and are held in a fixed position by strong intermolecular forces. These forces cause the molecules to vibrate or oscillate around their equilibrium positions. This vibration is responsible for the solid's rigidity and its ability to maintain its shape. Therefore, the statement that the molecules in a solid stay closely and vibrate against each other is true.

Heat causes matter to change from one state to another. When heat is applied to a substance, it increases the kinetic energy of its particles, causing them to move faster. This increase in energy can break the bonds between particles, leading to a change in the arrangement and movement of the particles. As a result, the substance can undergo a phase change, such as melting from a solid to a liquid or vaporizing from a liquid to a gas. Therefore, heat is the primary factor responsible for changing the state of matter.

Water in its gas state is called water vapor or steam. When water evaporates, it turns into a gas and rises into the atmosphere. This gas is called water vapor or steam. It is invisible to the naked eye, but when it condenses and cools, it forms clouds or can be seen as mist or fog.

If the buoyant force is greater than the weight of the fluid, the object will float in the fluid. This is because the buoyant force is the upward force exerted on an object submerged in a fluid, and it is equal to the weight of the fluid displaced by the object. When the buoyant force is greater than the weight of the fluid, it means that the object is less dense than the fluid, causing it to float.

A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

Mass is a measure of the amount of matter in an object. It is not related to the amount of space occupied by the object or its volume. Density, on the other hand, is a measure of how much mass is packed into a given volume. Therefore, the correct answer is that mass is the amount of matter in an object, regardless of its volume or density.

Density is a physical property that can be found by dividing the mass of an object by its volume. It represents the amount of mass per unit volume and is commonly used to characterize and compare different substances. By calculating the density of an object, we can determine how compact or spread out its particles are, which can provide insights into its composition and behavior.

Condensation refers to the change in state from gas to liquid. During condensation, the gas molecules lose energy and come closer together, forming a liquid. This process typically occurs when the temperature of a gas decreases, causing the molecules to slow down and bond together. Condensation is commonly observed when warm, moist air comes into contact with a cool surface, such as when water vapor in the air condenses on a cold window.

Solubility refers to the ability of a substance to dissolve in a solvent. It is a characteristic property of a substance and can be used to identify it. By observing how well a substance dissolves in a particular solvent, one can determine its solubility and potentially identify the substance.

A solid has both a definite volume and shape because its particles are closely packed together and have strong intermolecular forces that hold them in a fixed position. This results in a rigid structure that maintains its shape and volume.

The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.

The fact that the mystery substance sinks when placed in water indicates that it is denser than water.

A gas does not have a definite volume or a definite shape because its particles are highly energetic and move freely in all directions. Unlike solids and liquids, the particles in a gas are not tightly packed together and can spread out to fill the space available to them. This lack of a fixed volume and shape allows gases to expand and contract easily in response to changes in temperature and pressure.

A solution is a type of mixture. A mixture is a combination of two or more substances that are physically combined and can be separated through physical means. In the case of a solution, it is a homogeneous mixture where one substance (solute) is dissolved in another substance (solvent) to form a uniform mixture. The solute particles are dispersed throughout the solvent particles, creating a homogeneous distribution. Therefore, a solution is a specific type of mixture where substances are dissolved in a solvent.

Physical properties are characteristics of a substance that can be observed or measured without changing the substance into something else. Examples of physical properties include color, size, and hardness. Reactivity and evaporation are not physical properties because they involve a change in the substance. Chemical properties, on the other hand, describe how a substance interacts with other substances, which is also a change in the substance. Therefore, physical properties are the correct answer in this context.

The formula to find density is DENSITY= Mass / Volume. This formula calculates the density of an object by dividing its mass by its volume. Density is a measure of how much mass is contained within a given volume.

The correct answer is that homogeneous mixtures look the same throughout, while heterogeneous mixtures allow you to see the different parts. This is because in a homogeneous mixture, the substances are evenly distributed and cannot be easily distinguished, whereas in a heterogeneous mixture, the substances are not evenly distributed and can be visually identified as separate components.

A solution is composed of two parts, the solute and the solvent. The solute is the substance that is being dissolved, while the solvent is the substance that is doing the dissolving. In other words, the solute is the component that is being dispersed or dissolved in the solvent. This is a fundamental concept in chemistry, where solutions are formed by combining different substances in varying proportions.

Mass and weight are different concepts in physics. Mass refers to the amount of matter present in an object, while weight is the force exerted on an object due to gravity. Mass is a scalar quantity and is measured in kilograms, whereas weight is a vector quantity and is measured in newtons. The weight of an object can vary depending on the strength of the gravitational field it is in, while the mass remains constant. Therefore, mass and weight are not the same, and the correct answer is that mass is the amount of matter and weight is the amount of matter plus gravity.

A liquid has a definite volume but no definite shape because its particles are loosely packed and can move freely, allowing it to take the shape of its container. However, the volume remains constant as the particles are still closely packed together.

To determine how many cube-shaped boxes will fit inside Amaray's closet, she should measure the volume of both the closet and the boxes. Volume is the amount of space occupied by an object, and by comparing the volume of the boxes to the volume of the closet, Amaray can determine how many boxes will fit inside. The weight, mass, and density of the closet and boxes are not relevant in this context as they do not provide information about the space available.

This answer is correct because it states that sugar is soluble in water, which means it can dissolve in water to form a homogeneous solution. On the other hand, it states that pepper is not soluble in water, indicating that it cannot dissolve in water to form a homogeneous solution.

The density of an object refers to its mass per unit volume, which is a characteristic that can be measured without changing the substance's chemical composition. This makes it a physical property, as it describes a characteristic of the object itself rather than its ability to undergo chemical reactions or combustibility.

The correct answer is "The mass divided by the volume." Density is defined as the mass of an object divided by its volume. This formula allows us to determine how much mass is packed into a given volume. By dividing the mass by the volume, we can calculate the density of an object or substance.

Buoyant force is the force that pushes up on an object in a fluid. This force is exerted due to the difference in pressure between the top and bottom of the object. The buoyant force is equal to the weight of the fluid displaced by the object. It acts in the opposite direction to the force of gravity, causing objects to float or become buoyant in the fluid.

Homogeneous refers to a substance that has a uniform composition throughout, meaning that all its components are evenly distributed. A solution is a type of homogeneous mixture where one or more substances (solute) are dissolved in another substance (solvent). Therefore, solution is another name for homogeneous because it describes a substance that has a uniform composition, with all its components evenly distributed.

When you try to make a solution of salt and oil, it becomes a heterogeneous mixture because the salt does not dissolve into the oil. Salt is soluble in water but not in oil, so it will not mix evenly with the oil. Instead, the salt particles will remain separate and visible within the oil, creating a mixture with distinct phases.

pH is a measure of hydrogen ions (H+). pOH is a measure of hydroxide ions (OH-) in a solution.

Acids and bases combine to create water and salts. Example: When Sodium hydroxide (NaOH) and hydrochloric acid (HCl) combine to form the salt sodium chloride.

Sour taste corresponds to Acids NOT bases

Volume is the correct answer because it refers to the amount of space that a solid object occupies. In this context, it can be measured by placing the object in a graduated cylinder with water and measuring the amount of water that is displaced. Mass, density, weight, and solubility are not relevant in determining the amount of space occupied by the object.

A graduated cylinder is the most appropriate tool to measure the volume of a rock. This is because a graduated cylinder is designed to accurately measure the volume of liquids and irregularly shaped objects, such as rocks. It has markings along its side that allow for precise measurements of the volume of the rock by measuring the amount of liquid displaced when the rock is submerged in the cylinder. The other options, such as a triple beam balance, spring scale, and ruler, are not designed for measuring volume and would not provide accurate results in this case.

Since both vials contain the same amount of liquid (40ml), it can be concluded that both vials have the same volume. Density is a measure of mass per unit volume, so it cannot be determined solely based on the given information. Similarly, the mass of the liquids cannot be determined without knowing their densities. Therefore, the correct statement is that both vials have the same volume.

Matter is the correct answer because it refers to any substance that occupies space and has mass. It includes both solids, liquids, and gases. Mass, weight, and volume are properties or measurements associated with matter, but they do not encompass all types of material. Solubility, on the other hand, is a specific property related to the ability of a substance to dissolve in another substance.

To figure out how much matter is in the key chain, Jose should measure the mass of the key chain. Mass is a measure of the amount of matter an object contains, so by measuring the mass of the key chain, Jose can determine how much matter it contains. Weight, on the other hand, is a measure of the force of gravity acting on an object and can vary depending on the location. Volume is the amount of space occupied by an object and is not directly related to the amount of matter it contains. Density is the mass per unit volume and can be calculated using the mass and volume, but it does not directly measure the amount of matter in the key chain.

Bases are substances which release OH- (hydroxide) ions when dissolved in water. Acids release H+ ions in water.

Mass is the correct answer because it refers to the amount of material in an object. It is a measure of the quantity of matter in an object and is often considered as a fundamental property of an object. Mass is different from weight, which is the force exerted on an object due to gravity. Density and volume are related to mass but do not directly refer to the amount of material in an object. Physical properties are a broader category that includes various characteristics of an object, including mass.

A change in state does not signal a chemical change because it only involves a physical transformation of a substance, such as melting, freezing, or evaporating, without altering its chemical composition. Chemical changes, on the other hand, involve the breaking and forming of chemical bonds, resulting in the creation of new substances with different properties.

A pure substance always has the same density when measured under the same conditions. This means that regardless of the amount of the substance or the size of the sample, the density will remain constant. Additionally, the conditions under which the measurement is taken, such as temperature and pressure, also do not affect the density of a pure substance. Therefore, both the substance itself and the conditions of measurement contribute to the consistency of density.

Vinegar is an acid with a pH of that is typically around 2.5, therefore a weak acid. Although a weak acid, as any other substance, if used in excess it can do great damage to ones stomach.

Homogeneous mixtures are those in which the components are evenly distributed and cannot be visually distinguished. Water and shampoo both meet this criteria as they are uniform mixtures where the substances are evenly distributed throughout. On the other hand, rocky road ice cream and oatmeal are not homogeneous mixtures as they contain visible chunks or particles that are not evenly distributed.

The statement is false because molecules in a liquid do not spread out to fill the entire container. While molecules in a gas have high kinetic energy and can move freely to occupy the entire space available, molecules in a liquid are closely packed together and have less freedom of movement. They can move and flow within the container, but they do not spread out to fill the entire volume.

The density of pure water is 1kg/m3 because density is defined as the mass of a substance divided by its volume. Since the mass of water is 1kg and its volume is 1m3, dividing the two gives a density of 1kg/m3.

Mechanical mixtures are mixtures that can be easily separated into their individual components. In the given options, both the chocolate bar with almonds and orange juice with pulp are mechanical mixtures because they consist of different substances that can be visually distinguished and separated. In the case of the chocolate bar with almonds, the almonds can be easily picked out from the chocolate. Similarly, in orange juice with pulp, the pulp can be separated from the juice by straining or filtering. On the other hand, chocolate milk and flat pop are not mechanical mixtures as their components (milk and pop) cannot be easily separated.