chemical&physical
What is a chemical change?
A chemical change is when something change the way it looks.
What is a electromagnet?
A magnet that runs on a battery circuit
What is a deconstructive force?
A deconstructive force is when something gets broken down.
Identify how harmful microorganisms can spread from one person to another.
They can spread through direct contact, contaminated food or water, airborne droplets from coughing or sneezing, or contact with contaminated surfaces.
What is an instinct? What is a learned behavior?
An instinct is a behavior an animal is born with. It happens automatically and doesn’t need to be taught.
A learned behavior is something an animal learns by watching, practicing, or being taught.
What is a example of a physical change?
melting a ice cube into water.
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.
What is a delta land form?
a landform, often triangular in shape, created by the deposition of sediment carried by a river as it flows into a larger body of water like an ocean, lake, or another river.
Name two examples of beneficial microorganisms.
1: Lactobacillus (used in yogurt production)
2: Saccharomyces cerevisiae (a type of yeast used in baking and brewing)
Why is it important to understand the difference between inherited and acquired traits when learning about how living things grow and change?
Understanding the difference helps us know what traits we’re born with and what traits can change over time. This is important in science and health—like knowing if a disease runs in a family (inherited) or came from a person’s lifestyle (acquired). It also helps us see how organisms adapt to their environments.
What is a physical change? Give two examples.
A physical change is a change in the form or appearance of a substance without changing its chemical composition.
Examples: Ice melting into water, tearing a piece of paper.
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.
What is an constructive force?
An constructive force is when the Earth's surface builds up and make something new.
What is a harmful microorganism?
A harmful microorganism is a microscopic organism that can cause disease or damage to humans, animals, or the environment.
Why do animals need both instincts and learned behaviors to survive in their environment?
Animals need instincts to do important things like breathing, hiding from predators, or finding food right after birth. They need learned behaviors to adapt to new environments or situations.
How can you separate a mixture of sand and iron filings?
Use a magnet to attract the iron filings, leaving the sand behind.
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.
What is an example of an delta land form?
Ganges-Brahmaputra Delta, the Nile Delta, and the Mississippi Delta.
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.
What is an inherited trait? What is an acquired trait?
An inherited trait is a physical characteristic passed down from parents to their offspring through genes.
Example: Eye color, hair type, dimples
An acquired trait is a physical characteristic a person develops over time due to environment, experience, or lifestyle.
Example: Scars, dyed hair, muscles from exercise
What happens when salt dissolves in water? Does this change its chemical composition?
Salt dissolves in water by breaking into smaller particles (ions) that spread throughout the liquid.
No, the chemical composition of salt (NaCl) does not change; it is still salt, just mixed into the water.
What is a permanent magnet?
A permanent magnet is a magnet that maintains its magnetic properties without needing an external electric current.
What is the similarities between constructive and deconstructive force?
They both make the earth surface look different.
Compare beneficial and harmful microorganisms.
Beneficial microorganisms help with processes like digestion, food production, and decomposition. Harmful microorganisms can cause diseases and spoil food.
What is one way that an instinct is different from a learned behavior? What is one way they are similar?
Different: Instincts happen without teaching, but learned behaviors require training or experience.