Biology
What is Homeostasis?
Maintaining stable internal conditions
Give an evidence of a chemical change.
Color change, gas production, temperature change, or precipitate formation.
What are the three subatomic particles in an atom?
proton, neutron, and electron
TRUE OR FALSE: Fossil fuels are non-renewable resources
TRUE
A current of 2 A flows through a resistor with a resistance of 4 Ω. What is the voltage across the resistor?
V = IR
= 2 A × 4 Ω
= 8 V
What structure carries electrical signals through the nervous system?
Neuron
The basic unit of matter.
Atoms
Materials that allow electrons to move freely.
Conductors
What elements are required for life?
Carbon, Hydrogen, Oxygen, Nitrogen
A 12 V battery causes a current of 3 A to flow through a circuit. What is the resistance?
R = V/I
= 12 V ÷ 3 A
= 4 Ω
Name the parts of a neuron.
Dendrites, cell body, nucleus, axon, axon terminal, myelin sheath.
Two or more elements chemically bonded
Compound
Materials that prevent electron movement.
Insulators
how do heavy elements form in stars?
Supernova
A circuit has a resistance of 10 Ω and a current of 0.5 A. What is the potential difference?
V = IR
= 0.5 A × 10 Ω
= 5 V
What chemical messengers are released into the synapse?
Neurotransmitters
Two or more substances physically combined.
Mixture
The law that states that charge cannot be created or destroyed.
Law of Conservation of Charge
A reaction that releases energy.
Exothermic
If a 6 V battery is connected to a bulb and the bulb draws a current of 0.75 A, what is the resistance of the bulb?
R = V/I
= 6 V ÷ 0.75 A
= 8 Ω
What is the function of dopamine?
Linked to reward and pleasure.
What happens during a chemical reaction (within a molecule)?
Bonds are broken and new ones form.
The opposition to the flow of electric current.
Resistance
TRUE OR FALSE: Blue flame means that there is not enough oxygen.
FALSE
What is the power dissipated by a resistor when a current of 3 A flows through it and the potential difference is 9 V?
P = IV
= 3 A × 9 V
= 27 W
What does a motor neuron do?
Carries impulses from the CNS to muscles.
Define rate of reaction.
How fast a chemical reaction occurs.
What does an ammeter measure?
Electric Current
What is formed when plants, ferns, and trees are subjected to intense heat and pressure?
Coal
A device uses 48 W of power and operates at 12 V. What current does it draw?
A: I = P/V
= 48 W ÷ 12 V
= 4 A
What does a sensory neuron do?
Carries signals from receptors to the CNS.
An atom with the same number of protons but different neutrons.
Isotope
What is the formula for Ohm’s Law?
V=IR
It is when there is sufficient amount of oxygen is present to produce carbon dioxide gas.
Complete Combustion
A current of 2.5 A flows through a resistor that uses 20 W of power. What is the potential difference?
A: V = P/I
= 20 W ÷ 2.5 A
= 8 V
What does a relay neuron do?
Connects sensory and motor neurons in the CNS.
A charged atom due to loss or gain of electrons.
Ion
What is the formula for electric power?
P=IV
An orange flame indicates a lack of oxygen. Instead, the type of gas produced is _________.
Carbon Monoxide
Q: A heater operates at 10 A and 230 V. What is the power consumed?
A: P = IV
= 10 A × 230 V
= 2300 W
What is the reflex arc?
An automatic, rapid response to a stimulus. Brain is not involved.
What happens to atomic number across a period?
It increases by one.
What energy transformations occur in a light bulb?
Electrical energy to light and heat energy.
Name one climate effect of fossil fuel use.
Global warming, acid rain, or global dimming.
A lamp has a resistance of 60 Ω. If 2 A of current flows through it, what is the power used by the lamp?
First, V = IR = 2 A × 60 Ω = 120 V
Then, P = IV = 2 A × 120 V = 240 W
What happens when body temperature rises?
sweating, evaporation helps to cool the body temperature
What law is used to balance chemical equations?
Conservation of mass/matter.
What happens when static electricity discharges?
A spark or shock occurs.
The result when sulfur dioxide and nitrogen oxides react with water.
Acid Rain
A resistor has a resistance of 30 Ω. If a current of 3 A flows through it, what is the power used by the resistor?
First, calculate voltage:
V = IR = 3 A × 30 Ω = 90 V
Then, calculate power:
P = IV = 3 A × 90 V = 270 W