Life Science
What organelle is known as the "powerhouse" of the cell?
The Mitochondria
What force pulls objects to earth?
Gravity
A scientist counts 24 cells in each of 3 microscope slides. How many cells are there altogether?
72 Cells
What is the smallest unit of an element?
The Atom
What do scientists use to test a hypothesis?
An Experiment
What process do plants use to make food?
Photosynthesis
What is the unit used to measure force?
Newton (N)
A car travels 120 meters in 10 seconds. What is its speed?
12m/s
What are the three main states of matter?
Solid, Liquid, and Gas
What is a possible explanation that can be tested called?
Hypothesis
What is the basic unit of life?
The Cell
What is the formula for speed?
Distance ÷ Time (D/T)
A plant grows 2 cm every week. How tall will it grow after 8 weeks if it starts at 5 cm?
21cm
What is the chemical symbol for oxygen?
Oxygen (O)
What variable does a scientist purposely change in an experiment?
The Independent Variable
What molecule carries the genetic information of all living things?
DNA
If you push a box and it doesn't move, what force is opposing your push?
Friction
A rock has a mass of 300 grams and a volume of 100 cm³. What is its density? (Density = mass ÷ volume)
3g/cm3
What is the pH of a neutral substance like pure water?
7
What variable is measured or observed during an experiment?
Dependent variable
What body system is responsible for carrying oxygen and nutrient throughout the body?
The Circulatory System
What type of energy does an object have because of its motion?
Kinetic Energy
A scientist measures a temperature of 20°C at noon. By midnight, the temperature has dropped by 35°C. What is the temperature at midnight?
-15° C
What happens to atoms during a chemical reaction?
They are rearranged to form new substances
Why is it important for scientists to repeat experiments?
To make sure the results are reliable and not due to chance or error