electricity and magnetism
life scince
conducter and insulater
chemical and physical
100
What is static electricity? What is human-harnessed electricity?
Static electricity is when electric charge builds up on something, like when you rub a balloon on your hair. Human-harnessed electricity is the kind we use in homes and buildings, coming from power plants and wires.
100
What is a microorganism?
A microorganism is a tiny living organism that can only be seen under a microscope. Examples include bacteria, fungi, protozoa, and viruses.
100
What is static electricity? What is human-harnessed electricity?
Static electricity is when electric charge builds up on something, like when you rub a balloon on your hair. Human-harnessed electricity is the kind we use in homes and buildings, coming from power plants and wires.
100
When H20 hits 0c what happens to hits the physical state.
it goes solid.
200
Question: How are static electricity and human-harnessed electricity different?
Static electricity happens when electrons build up and make a sudden spark. Human-harnessed electricity flows in a steady way through wires to power things like lights and TVs.
200
Compare beneficial and harmful microorganisms.
Beneficial microorganisms help with processes like digestion, food production, and decomposition. Harmful microorganisms can cause diseases and spoil food. For example, E. coli can be harmful, while Lactobacillus is beneficial.
200
If you freeze water into ice and then melt it back into water, how do the properties of the substance change or stay the same?
The state of matter changes (solid to liquid and back), but the chemical composition of H₂O remains the same.
200
Compare and contrast mixing sand with water versus mixing salt with water. How do their physical changes differ?
When sand is mixed with water, it does not dissolve; instead, it settles at the bottom. This is a suspension.
When salt is mixed with water, it dissolves completely, forming a solution.
300
imagine you are designing a new way to use electricity. Would you use static or human-harnessed electricity? Why?
I would use human-harnessed electricity because it is more reliable and can power machines for a long time. Static electricity cannot provide steady energy, so it would not be good for running appliances.
300
Using at least two pieces of scientific evidence, construct an argument that supports the claim that some microorganisms are beneficial to human health.
Many microorganisms are essential to human health. For example, gut bacteria like Bifidobacterium help digest food and produce vitamins such as B12. Studies show that probiotics can improve digestion and strengthen the immune system. Therefore, not all microorganisms are harmful; some are vital for our well-being.
300
Design an experiment to test how temperature affects the rate at which salt dissolves in water. What variables would you control, and how would you measure your results?
Prepare three beakers with the same amount of water at different temperatures (cold, room temperature, hot). Add an equal amount of salt to each and stir. Measure the time it takes for the salt to fully dissolve.
300
Design an experiment to test how temperature affects the rate at which salt dissolves in water. What variables would you control, and how would you measure your results?
Experiment: Prepare three beakers with the same amount of water at different temperatures (cold, room temperature, hot). Add an equal amount of salt to each and stir. Measure the time it takes for the salt to fully dissolve.
400
How do people use static electricity in real life? How do people use human-harnessed electricity?
Static electricity is used in printers and air purifiers. People use human-harnessed electricity to power homes, businesses, and technology like computers and phones.
400
sing at least two pieces of scientific evidence, construct an argument that supports the claim that some microorganisms are beneficial to human health.
400
Develop a step-by-step procedure for separating a mixture containing sand, salt, and iron filings. Justify why you chose each separation method and how it demonstrates physical changes.
Step 1: Use a magnet to remove the iron filings (magnetism).
Step 2: Add water to the sand and salt mixture. The salt will dissolve while the sand remains.
Step 3: Use filtration to separate the sand from the saltwater solution.
Step 4: Evaporate the water to retrieve the salt.
Justification: Each step relies on a physical property (magnetism, solubility, and evaporation) without changing the chemical composition of the materials.
400
Develop a step-by-step procedure for separating a mixture containing sand, salt, and iron filings. Justify why you chose each separation method and how it demonstrates physical changes.
Step 1: Use a magnet to remove the iron filings (magnetism).
Step 2: Add water to the sand and salt mixture. The salt will dissolve while the sand remains.
Step 3: Use filtration to separate the sand from the saltwater solution.
Step 4: Evaporate the water to retrieve the salt.
Justification: Each step relies on a physical property (magnetism, solubility, and evaporation) without changing the chemical composition of the materials.