In this article, we will delve into the fascinating world of Mixtures and Compounds as discussed in Class 9 Science Chapter 2 Question Answer. We’ll explore the definitions, differences, properties, and examples of these fundamental concepts in chemistry. By the end of this discussion, you’ll have a clear understanding of how mixtures and compounds play a crucial role in shaping the world of matter around us.
Related Topic: Class 9th Science Notes
What causes a rich fuel mixture?
A rich fuel mixture is caused by an excess of fuel compared to the amount of air in the combustion process.
Which particle diagram represents a mixture of three substances?
A particle diagram showing three distinct types of particles mixed together represents a mixture of three substances.
Is Rocky Road ice cream a substance or a mixture?
Rocky Road ice cream is a mixture because it contains multiple ingredients like chocolate, nuts, and marshmallows.
How do I fix a lean fuel mixture?
To fix a lean fuel mixture, adjust the fuel-to-air ratio by increasing fuel input or reducing air intake.
What causes a rich air-fuel mixture?
A rich air-fuel mixture is caused by an excess of fuel compared to the amount of air in the combustion process.
What is a bridge mixture?
A bridge mixture refers to a blend of nuts, dried fruits, and candies often served as a snack.
How do you adjust the air-fuel mixture screw?
You adjust the air-fuel mixture screw on a carburetor to achieve the correct balance of fuel and air for optimal engine performance.
How do I adjust the idle mixture screws on Edelbrock carbs?
To adjust the idle mixture screws on an Edelbrock carburetor, turn them clockwise to lean the mixture or counterclockwise to enrich it until the engine runs smoothly at idle.
Is chromium a mixture or a pure substance?
Chromium is a pure substance because it consists of only one type of atom.
How to fix a rich fuel mixture?
To fix a rich fuel mixture, adjust the carburetor or fuel injection system to reduce the amount of fuel entering the engine.
Is ink a compound or a mixture?
Ink is a mixture because it typically contains pigments or dyes mixed with solvents and other additives.
What gas mixture for Stihl chainsaw?
Stihl chainsaws typically use a gas mixture of unleaded gasoline and two-stroke engine oil at a specific ratio.
Which two particle diagrams represent mixtures of diatomic elements?
Particle diagrams showing two types of atoms bonded together represent mixtures of diatomic elements like oxygen (O2) or nitrogen (N2).
Is Chex Mix a mixture or a pure substance?
Chex Mix is a mixture because it contains various ingredients like cereal, pretzels, and nuts.
Is a chocolate sundae an element, compound, or mixture?
A chocolate sundae is a mixture because it contains multiple ingredients like ice cream, chocolate sauce, and toppings.
What is a common water-to-coolant mixture?
A common water-to-coolant mixture in automotive cooling systems is a 50/50 ratio of water and antifreeze.
Which of the bacterial mixtures grows as a biofilm?
Bacterial mixtures that contain species capable of forming biofilms can grow as biofilms under suitable conditions.
Which of the figures below represents a homogeneous mixture?
Figures representing uniform distributions of particles without visible separation represent homogeneous mixtures.
Which way to turn the air-fuel mixture screw?
The direction to turn the air-fuel mixture screw depends on whether you need to lean or enrich the mixture; clockwise to lean, counterclockwise to enrich.
How to fix a rich air-fuel mixture?
To fix a rich air-fuel mixture, adjust the carburetor or fuel injection system to decrease the fuel-to-air ratio.
Is Chex Mix a heterogeneous mixture?
Chex Mix can be considered a heterogeneous mixture because it contains visibly different components like cereal, pretzels, and nuts.
What is true of a mixture according to BrainPOP?
According to BrainPOP, a mixture is a physical combination of substances that are not chemically combined.
Can you freeze the cake mixture?
Yes, cake mixture can be frozen, but it may affect the texture and quality of the cake when thawed and baked.
Is ink a compound or a mixture?
Ink is a mixture because it contains various components like pigments, solvents, and additives.
Is ink a mixture or a compound?
Ink is a mixture because it consists of different substances physically combined together.
Is N2O a heterogeneous mixture?
No, N2O (nitrous oxide) is a homogeneous mixture because it has a uniform composition throughout.
Which formula represents a mixture?
Formulas typically represent compounds, not mixtures, as mixtures don’t have fixed chemical formulas.
How do you get lumps out of a cream cheese mixture?
To get lumps out of a cream cheese mixture, you can use a hand mixer or blender to ensure smooth consistency.
Is chromium a pure substance or a mixture?
Chromium is a pure substance because it consists of only one type of atom.
Is magnesium a pure substance or a mixture?
Magnesium is a pure substance because it consists of only one type of atom.
Which of the following mixtures are solutions?
Mixtures that form clear and uniform solutions upon mixing are considered solutions.
How can you change the properties of a mixture?
You can change the properties of a mixture by altering the amounts or types of substances mixed, changing temperature or pressure, or introducing new components.
How do I fix a lean fuel mixture?
To fix a lean fuel mixture, adjust the carburetor or fuel injection system to increase the fuel-to-air ratio.
Is Chex Mix a pure substance or a mixture?
Chex Mix is a mixture because it consists of multiple ingredients combined physically.
Is grain alcohol a pure substance or a mixture?
Grain alcohol is a mixture because it
consists of ethanol (the main component) along with water and other impurities.
Is iron a heterogeneous mixture?
Iron is not a mixture; it is a pure substance, specifically a metal element.
Is spaghetti sauce a homogeneous or heterogeneous mixture?
Spaghetti sauce is typically a heterogeneous mixture because it contains visible chunks of ingredients like tomatoes, onions, and herbs.
How could you separate a mixture of acetone and α-naphthol?
You could separate a mixture of acetone and α-naphthol using techniques like distillation, chromatography, or solvent extraction based on their different physical or chemical properties.
How to adjust the fuel mixture screw?
To adjust the fuel mixture screw, you typically turn it clockwise to lean the mixture or counterclockwise to enrich it until achieving the desired engine performance.
How to adjust motorcycle carburetor air-fuel mixture?
You adjust the motorcycle carburetor air-fuel mixture by turning the mixture screw in small increments and observing the engine’s response to achieve optimal combustion.
How to mix a 32:1 gas-oil mixture?
To mix a 32:1 gas-oil ratio, add 32 parts of gasoline to 1 part of two-stroke engine oil, ensuring thorough mixing for proper lubrication and combustion in two-stroke engines.
Is 18 karat gold a mixture?
Yes, 18 karat gold is a mixture because it is an alloy containing 75% gold and other metals like silver, copper, or zinc.
Is a chocolate chip cookie a heterogeneous mixture?
Yes, a chocolate chip cookie is a heterogeneous mixture because it contains visible chunks of chocolate chips within the cookie matrix.
Is a soft drink a pure substance or a mixture?
A soft drink is a mixture because it contains water, sugar, flavorings, carbon dioxide, and possibly other additives.
Is apple juice without pulp a mixture or a pure substance?
Apple juice without pulp is a mixture because it consists of water, sugars, acids, vitamins, and minerals derived from apples.
Is cherry vanilla ice cream a homogeneous or heterogeneous mixture?
Cherry vanilla ice cream is a heterogeneous mixture because it contains distinct regions of cherries, vanilla, and ice cream.
Is chocolate milk a mixture or a solution?
Chocolate milk is a mixture because it contains milk, cocoa, sugar, and possibly other additives that are physically combined.
Is chunky peanut butter a homogeneous mixture?
No, chunky peanut butter is a heterogeneous mixture because it contains visible pieces of peanuts within the spread.
Is eggs a substance or a mixture?
Eggs are a mixture because they contain various components such as egg whites, egg yolks, water, proteins, and fats.
Is gold a homogeneous or heterogeneous mixture?
Gold is a homogeneous mixture when pure, but alloys like 18 karat gold are heterogeneous mixtures due to the presence of other metals.
Is Kool-Aid a compound or a mixture?
Kool-Aid is a mixture because it consists of water, sugar, flavorings, and possibly colorants that are combined but not chemically bonded.
Is magnesium a mixture or a pure substance?
Magnesium is a pure substance because it consists of only one type of atom.
Is mouthwash a homogeneous or a heterogeneous mixture?
Mouthwash is typically a homogeneous mixture because its components, such as water, alcohol, flavorings, and active ingredients, are uniformly distributed.
Is nail polish a substance or a mixture?
Nail polish is a mixture because it contains various components like solvents, resins, pigments, and additives combined to form the nail polish product.
Is Pepsi a solution or a mixture?
Pepsi is a mixture because it contains water, sugar, carbon dioxide, flavorings, colorants, and other additives, making it a complex mixture rather than a simple solution.
Is popcorn a compound, element, or a mixture?
Popcorn is a mixture because it is made of popped corn kernels, which consist of water, starch, proteins, and fibers.
Is vinegar a pure substance or a mixture?
Vinegar is a mixture because it contains acetic acid, water, and sometimes other compounds like flavorings or colorants.
What fraction of the lactic acid/lactate mixture is lactic acid?
The fraction of lactic acid in a lactic acid/lactate mixture depends on the pH of the solution; at a lower pH, more of it will be in the lactic acid form.
A mixture is or is not a chemical combining of substances.
A mixture is not a chemical combining of substances; it is a physical combination where substances retain their properties.
How can I thicken my deviled egg mixture?
You can thicken your deviled egg mixture by adding ingredients like mayonnaise, mustard, cream cheese, or Greek yogurt until reaching the desired consistency.
How is a compound different from a mixture according to BrainPOP?
BrainPOP teaches that compounds are chemically combined substances with fixed ratios, whereas mixtures are physically combined substances with variable ratios.
Is acetylene a pure substance or a mixture?
Acetylene (C2H2) is a pure substance because it consists of only one type of molecule.
Is aluminium foil an element, compound, or a mixture?
Aluminum foil is an element because it is made of pure aluminum, which consists of only one type of atom.
Is apple juice with pulp a heterogeneous mixture?
Yes, apple juice with pulp is a heterogeneous mixture because it contains visible particles of pulp suspended in the liquid.
Is baking soda an element, compound, or a mixture?
Baking soda (sodium bicarbonate, NaHCO3) is a compound because it contains sodium, hydrogen, carbon, and oxygen chemically bonded together.
Is carbon monoxide a pure substance or a mixture?
Carbon monoxide (CO) is a pure substance because it consists of only one type of molecule.
Is chocolate chip ice cream a heterogeneous mixture?
Yes, chocolate chip ice cream is a heterogeneous mixture because it contains visible chunks of chocolate within the ice cream base.
Is chocolate milk a homogeneous mixture?
Yes, chocolate milk is a homogeneous mixture because the chocolate flavoring is evenly distributed throughout the milk.
What are the characteristics of a homogeneous mixture?
A homogeneous mixture has uniform composition and properties throughout, with its components evenly distributed at a molecular level.
How can you separate a mixture of sand and salt?
You can separate sand and salt by dissolving the salt in water to form a salt solution, then filtering out the sand particles.
Is brass a pure substance or a mixture?
Brass is a mixture because it is an alloy made by combining copper and zinc, which are different elements.
What is a colloid? Provide an example.
A colloid is a type of mixture where particles are dispersed but not dissolved, such as milk (a colloid of fat droplets in water).
How does distillation separate a mixture?
Distillation separates a mixture based on differences in boiling points; the substance with the lower boiling point vaporizes first and is collected, leaving behind the higher boiling point substances.
Explain how a chromatography technique works to separate mixtures.
Chromatography separates mixtures based on differences in affinity between components and a mobile phase, allowing different substances to move at different rates and become visibly distinct.
What is the difference between a compound and a mixture?
A compound is a substance formed by chemically bonding different elements in fixed proportions, while a mixture is a physical combination of substances with variable compositions that can be separated by physical means.
