Podcast
Questions and Answers
What occurs when light bounces off a surface?
What occurs when light bounces off a surface?
- Reflection (correct)
- Absorption
- Diffraction
- Refraction
Which of the following is NOT a type of microbe that can cause disease?
Which of the following is NOT a type of microbe that can cause disease?
- Viruses
- Bacteria
- Proteins (correct)
- Fungi
What defines whether a reaction is exothermic?
What defines whether a reaction is exothermic?
- It produces heat. (correct)
- It requires energy.
- It releases light.
- It absorbs heat.
Which factor does NOT affect reaction rates?
Which factor does NOT affect reaction rates?
What is the primary purpose of drug trials?
What is the primary purpose of drug trials?
Flashcards
Refraction
Refraction
The bending of light as it passes from one medium to another. For example, a straw in a glass of water appears bent at the point where water meets air.
Drug
Drug
A chemical substance that can affect the body. These can be used to treat illnesses, manage symptoms, or alter body functions.
Combustion
Combustion
A rapid chemical reaction with oxygen that produces heat and light. This is a common way to release energy, like burning wood or fuel.
Displacement Reaction
Displacement Reaction
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Exothermic Reaction
Exothermic Reaction
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Study Notes
Light and Optics
- Light is a form of electromagnetic radiation.
- Visible light is a small part of the electromagnetic spectrum.
- We see objects because light from them is reflected into our eyes.
- The speed of light in a vacuum is approximately 3 x 108 m/s.
- Reflection occurs when light bounces off a surface.
- Lenses use refraction to focus light.
- Refraction is the bending of light as it passes from one medium to another.
- Colour is determined by the wavelength of light.
- The human eye focuses light using a lens.
Drugs, Health, and Disease
- Drugs are chemical substances that can affect the body.
- Drug trials are used to test the safety and effectiveness of drugs.
- Vaccines help protect against infectious diseases.
- Antibiotics treat bacterial infections.
- Antibiotic resistance is a growing concern.
- Non-communicable diseases are illnesses not caused by infectious agents.
- Bacteria, fungi, and viruses are types of microbes that can cause disease.
Chemical Reactions and Rates
- Combustion is a rapid chemical reaction with oxygen that produces heat and light.
- Thermal decomposition is the breaking down of a substance by heat.
- Displacement reactions involve one element replacing another in a compound.
- Oxidation is the gain of oxygen or loss of electrons.
- Reduction is the loss of oxygen or gain of electrons.
- Exothermic reactions release heat, while endothermic reactions absorb heat.
- Reaction rates are affected by factors such as temperature, concentration, and catalysts.
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