Chemical Reactions
What are the starting substances in a chemical reaction called?
Reactants
Which organelle controls what enters and leaves the cell?
Cell membrane
Which body system carries oxygen and nutrients through the body?
Circulatory system
What is the force on an object after all forces are combined called?
Net force
What is the energy of motion called?
Kinetic energy
Name one sign that a chemical reaction has occurred.
What is the basic unit of life?
Which body system breaks down food?
Digestive system
What happens when forces are balanced?
No change in motion / net force = 0
What is the total kinetic energy of particles in a substance called?
Thermal energy
A student mixes vinegar and baking soda and notices bubbles forming. What evidence suggests a chemical reaction occurred?
Gas production/bubbles
Which organelle is known as the “powerhouse of the cell”?
Mitochondria
A person cannot breathe properly. Which body system is primarily affected?
Respiratory system
A cart is pushed right with 15 N and left with 5 N. What is the net force and direction?
A cart is pushed right with 15 N and left with 5 N. What is the net force and direction?
What happens to particle motion when temperature increases?
Particles move faster
During a chemical reaction, atoms are rearranged but not created or destroyed. What law explains this?
Law of Conservation of Matter
What is the difference between plant and animal cells?
How do the respiratory and circulatory systems work together?
The respiratory system brings in oxygen, and the circulatory system transports it through the body.
A heavier object and a lighter object are pushed with the same force. Which accelerates more? Why?
The lighter object
A bathtub of warm water and a cup of hot water are compared. Which has more thermal energy? Why?
The bathtub
A piece of iron rusts after being left outside. Explain why this is a chemical change instead of a physical change.
A new substance formed (rust/iron oxide).
How do cells, tissues, organs, and organ systems work together?
Cells form tissues, tissues form organs, and organs work together in organ systems to perform life functions.
A person’s muscles are not receiving enough oxygen. Which TWO body systems are most likely involved?
Respiratory and circulatory systems
A student increases the force on a cart and notices acceleration increases. What does this show about force and motion?
More force causes greater acceleration. F=MA
What is the difference between temperature and thermal energy?
Temperature = average kinetic energy
Thermal energy = total kinetic energy