Download Science Journals 4-18 to 5-5

7th Grade Science Journal Make-Up Sheet
Monday, 4-18 to Thursday, 5-5 (7 Days)
Monday, 4-18
  If three resistors, a 2Ω, 4Ω and an 6Ω, are connected in series across a 24V battery, what is
the current in the circuit? What is the voltage drop across each resistor?
  If three resistors, 12 Ω , 24 Ω, and 6 Ω, are connected in parallel across a 24V battery, what
is the current through each branch of the circuit? What is the total current in the circuit? What
is the voltage drop across each resistor?
Tuesday, 4-19
 What is an advantage and disadvantage of using a series circuit? A parallel circuit?
 What remains constant and what changes in a series circuit? In a parallel circuit?
Thursday, 4-21
Draw the transverse wave and label its parts.
 What is the difference between alternating current and direct current electricity? Why is
direct current not used to power our homes?
Monday, 5-2
 List any two abiotic factors and any two biotic factors in the school’s land lab.
 Explain why all habitats are ecosystems, but not all ecosystems are habitats. What is the
main difference between the two?
Tuesday, 5-3
 Why is it important for nature to keep an organism population in check? What happens when
populations increase or decrease suddenly?
 What is an alien or exotic species? Why is it important for all Ohioans to know about the
emerald ash borer beetle? What is it? What does it do?
Wednesday, 5-4
 What are the three main differences between primary and secondary succession?
 Explain what the term biodiversity means. Why is this important in an ecosystem?
Thursday, 5-5
 Why are producers so important to every ecosystem?
 What is the main difference between photosynthesis and respiration?