Math
32 + 42 - 5 x 4
5
What do we call a vertical column on the periodic table in which elements share similar chemical properties?
A group
Q. A runner travels 20 meters in 4 seconds at a constant pace.
What is the runner’s speed?
5m/s
Cells need oxygen for aerobic respiration.
If a student holds their breath, their muscle cells eventually switch to a different process.
Name the process AND the molecule that builds up as a result.
Anaerobic Respiration → lactic acid builds up.
x = 9
A particle made of two or more atoms chemically bonded in a fixed ratio is known as what?
A molecule
A box has a mass of 3 kg.
What is the weight of the box on Earth? Use gravity = 10m/s2
30N
A plant received BLUE light for 48 hours.
What happens to the plant’s glucose production and WHY?
increased glucose (and overall carbohydrate) production, provided the light intensity is adequate.
(3/4)(8x−2)−5=7x+1
x=-3
Name the last six elements in Period 2 (the second row) of the periodic table, in order starting from Boron.
Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon
A bicycle is moving at 5 m/s and has a mass of 10 kg.
What is its kinetic energy?
125 J
During exercise, your breathing rate increases.
Explain why using both the respiratory and circulatory systems in your answer.
Muscles need more oxygen → respiratory system increases oxygen intake → circulatory system pumps oxygen faster to cells and removes CO₂.
A line passes through the points (2, 5) and (6, 13).
Find the slope of the line and write the equation in slope-intercept form.
y=2x+1
What is the process of a substance changing directly from a solid to a gas without becoming a liquid first?
Submlimation
A metal block has a mass of 240 g and a volume of 30 cm³.
What is its density?
8g/cm3
If a top predator (like a hawk) disappears from an ecosystem,
predict one possible effect on the populations below it and explain why.
Prey (like mice) increase → fewer predators → population grows → may reduce plant populations due to overfeeding.
A movie theater sells adult tickets and student tickets.
One night, they sold 78 tickets total.
Adult tickets cost $12, student tickets cost $8, and the total revenue was $760.
How many adult tickets and students were sold?
Answer: 50 adults, 28 students
Balance the following chemical equation:
__Al + __O2 -->__ Al2O3
A student pushes a box with a force of 20 N across the floor for 3 meters.
How much work does the student do on the box?
(W= F*d)
60J
A potato slice is placed in a highly concentrated salt solution for 30 minutes.
After the experiment, the potato becomes flexible and shrinks slightly.
Explain WHY this happens using the principles of osmosis.
Your explanation must mention water concentration, solute concentration, and movement of water.
The salt solution has a higher solute concentration (hypertonic) than the inside of the potato cells.
This means the water concentration inside the potato is higher than outside.
By osmosis, water moves out of the potato cells across the membrane toward the more concentrated solution.
As the cells lose water, they shrink and become flaccid, making the potato flexible.