Questions and Answers
Which of the following is not a property of water?
The water cycle acts to purify water by?
All of these
All of the following statements are true of hard water except?
It is estimated that 58% of the burden from diarrhoeal disease is attributable to unsafe water supply, sanitation and hygiene and includes 361,000 deaths of children under age five, mostly in low-income countries (WHO 2014). This amounts to ___________ deaths per year.
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Globally, water-borne diseases are the _________ leading cause of death in children below five years.
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You can live for weeks without food, but only days without water.
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Most of the water available on the earth's surface is potable.
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The major use of water in the United States is for personal consumption.
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Fire was one of the earliest agents that enabled chemical changes.
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It takes less energy to produce a pound of aluminum than it does to produce a pound of steel.
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Over the lifetime of a reusable glass bottle, there is an energy advantage over using a nonreturnable bottle.
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An oxidation reaction often occurs without a corresponding reduction reaction.
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Bleaches are oxidizing agents.
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In Food Chemistry, reducing agents are sometimes referred to as antioxidants.
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With respect to energy content, reduced forms of matter are generally?
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Which one of the following IS NOT one of the definitions of reduction?
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In which one of the following is the reactant undergoing reduction?
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Every reduction reaction MUST be accompanied by?
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How many molecules are in 237 g (about a cup) of water?
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Temperatures must be converted to the Celsius temperature scale when Charles' Law is used.
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Study Notes
Water Properties and Cycle
- Water has a lower density than most liquids, impacting its behavior in natural systems.
- The water cycle purifies water through natural processes like evaporation and condensation.
Water Quality and Health
- Hard water contains various minerals, but it does not solely comprise sodium (Na+) and potassium (K+) ions.
- Access to safe water, sanitation, and hygiene can prevent diseases. Diarrhoeal diseases account for 3.6% of the global burden of disease, leading to approximately 1.4517 million deaths annually.
- Unsafe water supply and sanitation contribute to 842,000 annual deaths, with 361,000 being children under five.
Preventable Diseases and Water Supply
- Water-borne diseases are the second leading cause of death in children under five, following acute respiratory infections.
- Global water supply and sanitation infrastructure is deteriorating and functioning below capacity.
Water Scarcity and Consumption
- Humans can survive weeks without food, but only days without water, highlighting the critical importance of hydration.
- Most water on Earth's surface is not safe for drinking, contradicting the notion that it is predominantly potable.
- The major use of water in the U.S. is not for personal consumption but for agricultural and industrial purposes.
Chemical Reactions and Energy
- Fire was one of the early catalysts for chemical changes in substances.
- Producing aluminum requires more energy than producing steel.
- Reusable glass bottles have an energy advantage over single-use bottles throughout their lifecycle.
- Oxidation and reduction reactions are interconnected; reduction involves the gain of electrons, while oxidation entails a corresponding electron loss.
- Bleaches act as oxidizing agents and are integral to various chemical processes.
Energy and Redox Reactions
- Reduced forms of matter are reservoirs of potential energy and can serve as effective fuels.
- Reduction reactions must always accompany oxidation, demonstrating the conservation of charge in chemical reactions.
Molecular Quantization
- One cup (237 grams) of water contains approximately 7.93 x 10^24 molecules, illustrating the vast number of water molecules in everyday measurements.
Temperature Conversions
- Charles' Law does not require temperature to be converted to the Celsius scale, debunking common misconceptions related to gas laws.
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Description
Test your understanding of the properties of water and the water cycle with these flashcards. This quiz covers key concepts such as water density, purification processes, and the characteristics of hard water. Prepare to demonstrate your knowledge and clear any misconceptions!
