Chemistry Exam Questions

Questions and Answers

In the potassium chlorate and gummy bear lab, what happens when potassium chlorate is heated? (Select all that apply)

It forms salt crystals

It absorbs water

It changes color

It produces oxygen gas (correct)

What does the pH scale measure? (Select all that apply)

Concentration of salts

Temperature

Density

Acidity or basicity (correct)

What is the main purpose of a nuclear reactor in a power plant? (Select all that apply)

To use the sun’s energy for power

To produce wind energy

To create energy through nuclear fission (correct)

To produce electricity by burning coal

When rounding to 2 significant figures, what is 4.756?

4.8 Signup and view all the answers

In an atom, where are protons located?

In the nucleus Signup and view all the answers

In a crystal growth lab, which of the following factors affects the size of the crystals?

The volume of the solution Signup and view all the answers

What does the term 'oxidation' mean in the rust lab?

The loss of electrons from a substance Signup and view all the answers

In the sodium nitrate and water lab, what happens when sodium nitrate dissolves in water?

It breaks into sodium ions and nitrate ions Signup and view all the answers

What does the term 'current' refer to in an electrical circuit?

The flow of electric charge Signup and view all the answers

Voltage is often described as:

The pressure that pushes electrons through a circuit Signup and view all the answers

When two solutions are mixed and a solid forms, the solid is called a:

Precipitate Signup and view all the answers

What does it mean for a solution to be supersaturated?

It has dissolved more solute than it can normally hold Signup and view all the answers

Which of the following terms describes the arrangement of atoms in a crystal structure?

Ordered and repeating pattern Signup and view all the answers

What is the SI unit for mass?

Kilogram Signup and view all the answers

Gravity is best defined as:

A force that pulls objects toward the center of the Earth Signup and view all the answers

If you increase both the mass and the volume of an object equally, what happens to its density?

It stays the same Signup and view all the answers

What is the role of a catalyst in a chemical reaction?

It speeds up the reaction without being consumed Signup and view all the answers

An exothermic reaction:

Releases heat Signup and view all the answers

When a compound decomposes, it:

Breaks down into simpler substances Signup and view all the answers

After a chemical reaction, the solid material left behind is called:

Residue Signup and view all the answers

Static electricity occurs when:

Electric charges accumulate on the surface of a material Signup and view all the answers

Which of the following is an example of static discharge?

A lightning bolt Signup and view all the answers

A conductor allows electricity to pass through it. Which of the following is an example of a conductor?

Copper Signup and view all the answers

The SI unit for measuring electric current is:

Ampere Signup and view all the answers

PH importance in daily life?

pH can help identify dangerous substances in food and water Signup and view all the answers

Difference in mass despite same size in a density lab?

The objects are made of different materials, so their densities differ Signup and view all the answers

Why don't noble gases react easily with other elements?

Noble gases are stable because they have full electron shells Signup and view all the answers

Study Notes

Potassium Chlorate Experiment

Heating potassium chlorate produces oxygen gas.

pH Scale

Measures the acidity or basicity of a solution.

Nuclear Reactors

Main purpose: create energy through nuclear fission.

Significant Figures

Rounding 4.756 to two significant figures results in 4.8.

Protons in an Atom

Protons are located in the nucleus of an atom.

Crystal Growth

Factors affecting crystal size include the temperature of the solution.

Oxidation

Defined as the loss of electrons from a substance.

Sodium Nitrate in Water

Sodium nitrate dissolves into sodium ions and nitrate ions.

Electrical Current

Current refers to the flow of electric charge.

Voltage Definition

Voltage is the pressure that pushes electrons through a circuit.

Mixing Solutions

A solid formed from mixed solutions is called a precipitate.

Supersaturated Solutions

A solution is supersaturated if it has dissolved more solute than it can normally hold.

Crystal Structure

Atoms in a crystal structure are arranged in an ordered and repeating pattern.

SI Unit for Mass

The SI unit for mass is the kilogram.

Gravity

Best defined as a force that pulls objects toward the center of the Earth.

Density and Mass-Volume Increase

If both mass and volume of an object increase equally, its density stays the same.

Catalyst Role

A catalyst speeds up a chemical reaction without being consumed.

Exothermic Reactions

Define reactions that release heat.

Decomposition of Compounds

A decomposing compound breaks down into simpler substances.

Solid Material After Reactions

The solid left behind after a reaction is referred to as a precipitate or residue.

Static Electricity

Occurs when electric charges accumulate on the surface of a material.

Example of Static Discharge

A lightning bolt exemplifies static discharge.

Conductors

Conductors, such as copper, allow electricity to pass through them.

SI Unit for Electric Current

The SI unit for measuring electric current is the ampere.

pH in Daily Life

pH helps identify dangerous substances in food and water.

Mass Density Comparison

Different materials can have different densities, explaining mass variations despite similar sizes.

Noble Gases Reactivity

Noble gases are stable due to full electron shells, making them less reactive.

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Description

This quiz covers key concepts in chemistry, including the thermal behavior of potassium chlorate, the pH scale, and the functions of nuclear reactors. Test your knowledge on these essential topics to prepare for your exams.