Physical & chemical
What is a physical change?
A change in appearance or form, but the substance is still the same
How does rain cause erosion?
Rain can break down and carry away soil and rocks, especially when it falls hard or in large amounts.
What are the two main groups of organisms based on whether they make their own food?
Producers and consumers.
What is the function of the cell membrane?
act as selective barrier
What is static electricity?
Static electricity is electricity that builds up and stays on an object, not flowing, like when you rub a balloon on your hair and it sticks to the wall.
What is a chemical change?
A chemical change is a change that results in the formation of new substances with different properties than the original substance. Examples include burning wood, cooking an egg, or rusting metal.
What is erosion?
Erosion is the process of breaking down and carrying away soil and rock by natural forces like wind, water, and ice.
What is the role of a producer in an ecosystem
what is photosynthesis
Explain how cell membrane helps a cell choose which substances cam enter or exit using the term " selectively permeable."
The cell membrane acts like a gatekeeper, allowing only certain substances to pass through while keeping others out. This is because it's selectively permeable, meaning it allows some substances to enter or exit the cell while preventing others. For example, it lets in nutrients and oxygen, but keeps out harmful substances or waste materials. This helps the cell maintain a stable internal environment and carry out its specific functions.
How does static electricity build up?
Static electricity builds up when objects are rubbed together, causing electrons to transfer between them.
What is the main difference between a physical change and a chemical change?
A physical change alters the form or appearance of a substance, while a chemical change creates a new substance with different properties.
What are the main forces that cause erosion?
The main forces that cause erosion are wind, water, and ice. Other factors like gravity can also contribute to erosion, like landslides and mudslides.
What are the three main types of organisms in a food chain?
what are Producers,consumers,and decomposers?
what is a cell
A cell is the basic unit of life, the smallest structure that can perform all the functions of life.
Describe how a changing magnetic field induces an electric current, and how this is used in a car's ignition coil.
In a car's ignition system, a changing magnetic field produced by the rotation of the car's engine is used to create an electric current that sparks the engine's spark plugs. This system relies on electromagnetic induction, where a coil of wire within the ignition coil experiences a rapidly changing magnetic field, inducing a strong electric current. This current is then pulsed to the spark plugs, igniting the air-fuel mixture and powering the car.
True or False: Turning ice into water is a physical change.
True
What are some ways to prevent erosion?
What are the main body systems in animals and what do they do?
The main body systems include respiratory (breathing), circulatory (carrying blood), digestive (breaking down food), excretory (removing waste), and nervous (controlling body functions
What is the cell membrane
The outer boundary that controls what goes in and out.
What are the two main types of electric charge?
what does Positive and negative mean
True or False: Burning paper is a physical change.
False
What are some examples of erosion?
Examples include the erosion of riverbanks, the creation of sand dunes, and the carving of canyons by glaciers.
How do plants make their own food?
Plants make their own food through photosynthesis, using sunlight, water, and carbon dioxide to create sugar (glucose) and oxygen.
what an organelle?
Specialized structures within cells that perform specific jobs, like the mitochondria, which is the "powerhouse" of the cell.
What is the name of a complete path for electricity to flow?
what is a Circuit