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Questions and Answers
In the potassium chlorate and gummy bear lab, what happens when potassium chlorate is heated? (Select all that apply)
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)
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)
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?
When rounding to 2 significant figures, what is 4.756?
In an atom, where are protons located?
In an atom, where are protons located?
In a crystal growth lab, which of the following factors affects the size of the crystals?
In a crystal growth lab, which of the following factors affects the size of the crystals?
What does the term 'oxidation' mean in the rust lab?
What does the term 'oxidation' mean in the rust lab?
In the sodium nitrate and water lab, what happens when sodium nitrate dissolves in water?
In the sodium nitrate and water lab, what happens when sodium nitrate dissolves in water?
What does the term 'current' refer to in an electrical circuit?
What does the term 'current' refer to in an electrical circuit?
Voltage is often described as:
Voltage is often described as:
When two solutions are mixed and a solid forms, the solid is called a:
When two solutions are mixed and a solid forms, the solid is called a:
What does it mean for a solution to be supersaturated?
What does it mean for a solution to be supersaturated?
Which of the following terms describes the arrangement of atoms in a crystal structure?
Which of the following terms describes the arrangement of atoms in a crystal structure?
What is the SI unit for mass?
What is the SI unit for mass?
Gravity is best defined as:
Gravity is best defined as:
If you increase both the mass and the volume of an object equally, what happens to its density?
If you increase both the mass and the volume of an object equally, what happens to its density?
What is the role of a catalyst in a chemical reaction?
What is the role of a catalyst in a chemical reaction?
An exothermic reaction:
An exothermic reaction:
When a compound decomposes, it:
When a compound decomposes, it:
After a chemical reaction, the solid material left behind is called:
After a chemical reaction, the solid material left behind is called:
Static electricity occurs when:
Static electricity occurs when:
Which of the following is an example of static discharge?
Which of the following is an example of static discharge?
A conductor allows electricity to pass through it. Which of the following is an example of a conductor?
A conductor allows electricity to pass through it. Which of the following is an example of a conductor?
The SI unit for measuring electric current is:
The SI unit for measuring electric current is:
PH importance in daily life?
PH importance in daily life?
Difference in mass despite same size in a density lab?
Difference in mass despite same size in a density lab?
Why don't noble gases react easily with other elements?
Why don't noble gases react easily with other elements?
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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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