scientific method
How does a controlled experiment improve the reliability of scientific results?
Controlled experiments isolate variables for reliable results.
How can you use physical and chemical properties to identify an unknown substanc?
Properties like melting point, reactivity help identify substances.
Describe how energy changes are involved in breaking and forming chemical bonds?
Energy breaks bonds and forms bonds
Describe what happens to a molecular motion when ice melts?
Molecules sped up and move part when ice melts
What role do mitochondria play in energy production
convert the chemical energy stored in food (carbohydrates, fats, and proteins) into usable energy in the form of ATP
Why is it important to communicate scientific results, even if the hypothesis is wron?
Sharing results advances knowledge regardless of outcome.
Explain why boiling water is a physical change but rusting iron is a chemical change?
Boiling water is physical, rusting is chemical
Why does the formation of a precipitate indicate a chemical reactio?
Precipitate forms when new solid substance appears
How does heat transfer affect the state changes of matter?
Heat transfer adds or removes energy, causing phrase changes
How do chloroplasts contribute to energy transformation in plants
two-stage process that converts light energy into chemical energy
Design a simple experiment to test how light affects plant growth, identifying the things?
Example experiment: grow plants with/without light, controlling water and soil.
What physical properties would you measure to separate a mixture of sand and stuf?
Separate sand and salt by dissolving salt in water and filtering sand.
Give me a example of a chemical reaction that release energy and one that absorbs energy?
Exothermic : burning woods ; endothermic: photosynthesis
Explain why temperature remains constant during a phrase change?
Temperature stays constant during phrase change because energy changes state, not temperature
What would happen if a cell lacked a cell membrane
It would be unable to survive and function
Why is the nucleus called the control center of the cell?
It’s often refered to as that because of it’s vital role in the cells genetic material