Acids and Alkalis Quiz

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Questions and Answers

Acids have a _ taste, while alkalis have a _ taste.

sour, bitter

Alkalis have a slippery feel.

True (A)

Which of the following is NOT a common use of acids?

Making explosives and fertilizers
Making soaps and detergents (correct)
Removing rust from iron or steel objects
Used in car batteries

Match the following acids with their corresponding uses:

Hydrochloric acid = Removes rust from iron/steel objects Sulfuric acid = Used in car batteries Nitric acid = Making explosives/fertilizers Ascorbic acid = Found in vitamin C tablets Signup and view all the answers

What is the general word equation for the neutralization reaction between an acid and an alkali?

acid + alkali → salt + water Signup and view all the answers

In the reaction of hydrochloric acid with sodium hydroxide, the salt formed is _______ chloride.

sodium Signup and view all the answers

All metals react with acids to form salt and hydrogen gas.

False (B) Signup and view all the answers

What is the chemical equation for the reaction between sulfuric acid and potassium hydroxide?

H2SO4 + 2KOH → K2SO4 + 2H2O (D) Signup and view all the answers

Acids react with metals to form a ____ and hydrogen gas.

salt Signup and view all the answers

The reaction of an acid with a metal produces carbon dioxide gas.

False (B) Signup and view all the answers

What is the general word equation for the reaction of an acid with a carbonate?

acid + carbonate → salt + carbon dioxide + water (C) Signup and view all the answers

What observation is used to test for hydrogen gas?

A lighted splint will pop with a squeaky sound when held at the mouth of a test tube containing hydrogen gas. Signup and view all the answers

Match the following terms with their corresponding chemical formulas:

Hydrochloric acid = HCl Magnesium carbonate = MgCO3 Magnesium chloride = MgCl2 Carbon dioxide = CO2 Signup and view all the answers

When carbon dioxide gas is bubbled through limewater, a ____ precipitate is formed.

white Signup and view all the answers

Which of the following is NOT a product of the reaction between an acid and a carbonate?

Hydrogen gas (D) Signup and view all the answers

The reaction of an acid with a carbonate is a neutralization reaction.

False (B) Signup and view all the answers

When an acid reacts with a carbonate, the products are a salt, and .

Signup and view all the answers

Universal Indicator is green when ______

neutral Signup and view all the answers

Which of the following indicators will turn blue in an alkaline solution?

Universal Indicator (A), Blue Litmus (C) Signup and view all the answers

Red Litmus paper turns blue when dipped in an acidic solution.

False (B) Signup and view all the answers

What color will Universal Indicator be in a solution with a pH of 7?

green Signup and view all the answers

Match the indicator with its color change in an acidic solution:

Red Litmus = Turns blue Blue Litmus = Turns red Universal Indicator = Turns red or orange Methyl Orange = Turns red Bromothymol Blue = Turns yellow Signup and view all the answers

Litmus paper can be used to determine whether a solution is or .

acidic, alkaline Signup and view all the answers

A student is using red and blue litmus paper to test an unknown solution. The red litmus paper turns blue, and the blue litmus paper remains blue. What can be concluded about the solution?

It is alkaline (C) Signup and view all the answers

Describe the color change observed when Universal Indicator is added to a solution that is acidic, neutral, and alkaline.

In an acidic solution, Universal Indicator turns red or orange. In a neutral solution, it remains green. In an alkaline solution, it turns purple or blue. Signup and view all the answers

What are the two main factors that cause iron to rust?

Oxygen and water vapor (C) Signup and view all the answers

Cooking food involves chemical reactions that make it more flavorful and easier to digest.

True (A) Signup and view all the answers

What is the primary process that breaks down glucose in the presence of oxygen, releasing energy?

Respiration Signup and view all the answers

To slow down decomposition, we could ______ food to reduce the amount of oxygen gas available for bacteria.

vacuum pack Signup and view all the answers

Match the following methods used to prevent rusting with their corresponding examples.

Coating with a substance = Paint, oil, varnish, galvanic coating Reducing exposure to oxygen and water = Storing metal objects in dry environments, using rust inhibitors Using a more corrosion-resistant metal = Stainless steel, galvanized steel Signup and view all the answers

Which of these is NOT a common example of a coating used to prevent rusting?

Plastic (A) Signup and view all the answers

What is the main purpose of burning fuels?

To convert chemical potential energy into other forms of energy to do work. Signup and view all the answers

Respiration occurs only in animal cells.

False (B) Signup and view all the answers

If a solution has a pH of 5.5, which color would be observed when a mixture of phenolphthalein, bromothymol blue, and methyl orange is added?

Yellow (D) Signup and view all the answers

Antacids are acidic compounds used to neutralize excess acid in the stomach.

False (B) Signup and view all the answers

Most plants grow best when the soil is ______ or slightly acidic, around pH 6 or 7.

neutral Signup and view all the answers

What is the primary role of toothpaste in maintaining oral hygiene?

Toothpaste neutralizes acids produced by bacteria in the mouth, helping to prevent tooth decay. Signup and view all the answers

Match the following descriptions with the corresponding chemical change categories:

Mixing lemon juice and baking powder = Mixing Butane gas combustion with a spark = Heating Photosynthesis in green plants = Exposure to Light Signup and view all the answers

All chemical reactions require mixing of reactants to initiate the process.

False (B) Signup and view all the answers

The process of ______ involves using thermal energy to initiate a chemical reaction.

Many chemical reactions require an initial input of energy, often provided by heat, to overcome the activation energy barrier and proceed. Signup and view all the answers

Which of these examples demonstrates a chemical change initiated by exposure to light?

Photosynthesis in plants (A) Signup and view all the answers

A liquid with a pH of 7 is acidic.

False (B) Signup and view all the answers

What does the pH scale indicate?

The acidity or alkalinity of a solution (B) Signup and view all the answers

Flashcards

Properties of Acids

Acids have a sour taste, react with metals, and have a pH level below 7.

Properties of Alkalis

Alkalis have a bitter taste, feel slippery, and have a pH level above 7.