Hello, I have some science questions I'd like to double-check before I submit them:
The temperature at which water changes from a gas to a liquid is
Select one:
a. –150°C
b. 100°C
c. –273.15°C
d. 0°C***
A man puts a tea kettle on a stove and turns on the burner. After a few minutes, all the water in the tea kettle is hot.
What process is most responsible for heat spreading throughout the water in the tea kettle?
Select one:
a. Radiation
b. Convection***
c. Conduction
d. Expansion
What is a positive consequence of increased energy use?
Select one:
a. Polluting the environment
b. Using up energy resources
c. Global climate change
d. More choices for fast transportation***
Explain two ways that you can conserve energy in your daily life.
My answer:
One way to conserve energy in everyday life is by switching off lights after you leave a room. This is very easy to do and make a habit of and saves a lot of energy in the long term.
Another way to conserve energy is to wear warm clothing (e.g. a sweater) when you feel a little bit chilly, instead of turning the heat up. This saves the energy used to heat air.
water does not boil at the freezing point.
The rest looks ok.
Oh, sorry, I thought it was the condensation temperature. It is 100°C.
Thank you!
ah, steam also turns to water at 100 deg C (at 1 atm)
water FREEZES at 0 deg C
100°C was correct
Your answers to the science questions are mostly correct! Let me explain the correct answers and provide more information:
1. The temperature at which water changes from a gas to a liquid is 100°C (or 212°F). So the correct answer is b. 100°C.
To get this answer, you can refer to the phase diagram of water. It shows that at normal atmospheric pressure, water changes from a gas (water vapor) to a liquid at 100°C. This temperature is known as the boiling point of water.
2. The process most responsible for heat spreading throughout the water in the tea kettle is convection. So the correct answer is b. Convection.
Convection is the transfer of heat through the movement of a fluid (in this case, water). When water is heated, it becomes less dense and rises while cooler water sinks. This creates a continuous circulation of hot and cold water within the kettle, distributing heat evenly throughout.
3. A positive consequence of increased energy use is having more choices for fast transportation. So the correct answer is d. More choices for fast transportation.
Increased energy use, particularly in transportation systems, leads to advancements in transportation technology. This allows for faster modes of travel, such as airplanes, high-speed trains, and electric vehicles. These options provide more convenience and flexibility for people to travel quickly and efficiently.
Your explanation of conserving energy in daily life is great! Here are a couple more examples:
1. Use energy-efficient appliances: When purchasing new appliances, choose ones with high energy efficiency ratings. They consume less energy to perform the same tasks, which can help reduce overall energy consumption.
2. Unplug unused electronics: Even when turned off, many electronic devices continue to draw power if plugged in. By unplugging devices like chargers, computers, and televisions when not in use, you can save energy and reduce standby power consumption.
Remember, conserving energy not only helps reduce energy costs but also has a positive impact on the environment by reducing carbon emissions and decreasing the demand for non-renewable energy sources.