C1 W3
Students in a science class are classifying substances as elements, compounds, homogeneous and heterogeneous mixtures.
Read the list below.
● Air
● Iron filings and sand
● Bowl of cereal
● Oil and water mixture
Which example from the list is a homogeneous mixture?
True or False.
An element is made up of only one type of atom, while a compound is made up of two or more types of atoms.
True
A 24 kg object is subjected to various forces. Which of the following will affect the object’s acceleration according to Newton’s second law?
A. The net force applied to the object.
B. The object’s color.
C. The object’s speed.
D. The time duration of the force.
A. The net force applied to the object.
Two kickers on a football team are practicing kicking field goals. The first player kicks the ball with a force of 10 N. The second player kicks the same ball with a force of 12 N.
How would the increase in force by the second player change the acceleration of the football?
A. The increase in force would change the acceleration to 0 m/s2.
B. The increase in force would decrease, then increase the acceleration of the football.
C. The increase in force would decrease the acceleration of the football.
D. The increase in force would increase the acceleration of the football.
D. The increase in force would increase the acceleration of the football.
What are the four (4) quadrants of the H-R Diagram?
Hot/ Bright
Hot / Dim
Cool/ Bright
Cool/ Dim
Students are comparing models of homogeneous and heterogeneous mixtures. Which TWO descriptions accurately describe a model of a homogeneous mixture?
A. The particles are layered, with visible differences in color and texture.
B. The particles in the model are easily identified and separated by sight.
C. The model shows clumps or clusters of different particles in one container.
D. The particles of each substance are evenly spread throughout the model.
E. The mixture has a uniform appearance and does not show separate
D. The particles of each substance are evenly spread throughout the model.
E. The mixture has a uniform appearance and does not show separate
2Na+Cl2→2NaCl
If 21 grams of sodium (Na) reacts with 83 grams of chlorine (Cl2 ), how much sodium chloride (NaCl) is formed?
A. 21 grams B. 62 grams C. 83 grams D. 104 grams
D. 104 grams
A student pushes a cart with a force of 20 N to the right, and friction provides a force of 15 N to the left.
What is the net force acting on the cart?
A. The net force is 0 N because the forces cancel each other.
B. The net force is 5 N to the right because the student’s push is greater than the force of friction.
C. The net force is 35 N because both forces add together.
D. The net force is 15 N to the left because of the force of friction.
B. The net force is 5 N to the right because the student’s push is greater than the force of friction.
A student uses a magnet to move a 0.025 kg metal ball. The magnet exerts a force of 5 N, which causes the ball to begin moving.
What is the acceleration of the ball when it begins to move?
A. 200 m/s2
B. 0.125 m/s2
C. 5 m/s2
D. 5.025 m/s2
A.200 m/s2
Which one does not belong?
Sun
Spica
Betelgeuse
Barnard's Star
Betelgeuse
Marshmallows are made by combining sugar, water, and gelatin, then whipping the mixture to create a light and airy texture. The mixture is then shaped into individual pieces and packaged in a bag. Based on how marshmallows are produced, how should a bag of marshmallows be classified as a type of matter?
A. Element, because each marshmallow is made from the same ingredients.
B. Compound, because the marshmallows contain both sugar and gelatin that are chemically bonded.
C. Homogeneous mixture, because the ingredients are thoroughly combined during the manufacturing process.
D. Heterogeneous mixture, because the bag contains individual marshmallows that can be physically separated
D. Heterogeneous mixture, because the bag contains individual marshmallows that can be physically separated
In the context of water transport in plants, which of the following statements best describes the relationship between cohesion and adhesion?
A. Cohesion and adhesion work together to move water upward through narrow tubes in the plant.
B. Cohesion pulls the water upward, while adhesion pulls the water downward.
C. Adhesion pulls the water upward, while cohesion does not affect the water's movement.
D. Neither cohesion nor adhesion plays a role in capillary action.
A. Cohesion and adhesion work together to move water upward through narrow tubes in the plant.
A force of 600 N is applied to a 300 kg object, and it accelerates. What would happen to the object’s acceleration if the force is doubled while the mass remains the same?
A. The object’s acceleration would stay the same.
B. The object’s acceleration would be cut in half.
C. The object’s acceleration would double.
D. The object’s acceleration would quadruple.
C. The object’s acceleration would double.
Which TWO statements are correct?
A. X-rays have a shorter wavelength than microwaves.**
B. X-rays have a lower frequency than microwaves.
C. Microwaves carry less energy than X-rays.**
D. Both X-rays and microwaves have the same energy because they travel at the speed of light.
E. Microwaves have a shorter wavelength than X-rays.
A. X-rays have a shorter wavelength than microwaves.
C. Microwaves carry less energy than X-rays.
The Sun’s energy reaches Earth’s surface unevenly. Some areas receive more direct sunlight, while others receive less. Which statement best explains how this uneven heating influences Earth’s weather and climate?
A. Uneven solar heating causes some regions to warm more quickly, leading to differences in temperature that drive winds and rainfall patterns.
B. Uneven solar heating only affects oceans, leading to differences in temperature that drive winds and rainfall patterns.
C. Uneven solar heating makes all regions of Earth have the same weather and climate over long periods of time.
D. Uneven solar heating increases the amount of greenhouse gases in the atmosphere, which directly creates weather and climate patterns.
A. Uneven solar heating causes some regions to warm more quickly, leading to differences in temperature that drive winds and rainfall patterns.
Read each observation about water.
1. Water droplets attract one another and form a larger pool of water.
2. Water sticks to your hands after you wash them.
3. Water sticks to a spiderweb after a rainstorm.
4. Water from a fountain forms droplets.
Choose the option that correctly identifies which observations are a result of cohesion and which observations are a result of adhesion.
A. Cohesion: 1, 4 and Adhesion: 2, 3
B. Cohesion: 2, 3 and Adhesion: 1, 4
C. Cohesion: 1, 2, 3 and Adhesion: 4
D. Cohesion: 3, 4 and Adhesion: 1, 2
A. Cohesion: 1, 4 and Adhesion: 2, 3
At a welding workshop, students observe iron welding and learn the equation:
4Fe + 3O₂ → 2Fe₂O₃
Which elements are involved in this reaction, and how can the periodic table help identify them?
Iron and Oxygen
A 60 kg person jumps off a diving board. As they push down on the board, it pushes them upward with equal force. Which law of motion best explains this?
A. Newton’s First Law explains why the person stays in the air once they jump.
B. Newton’s Second Law explains how the force of gravity affects the person’s motion.
C. Newton’s Third Law explains that the force exerted on the diving board is equal and opposite to the force pushing the person upward.
D. Newton’s First Law explains why the person falls back down after reaching a certain height.
C. Newton’s Third Law explains that the force exerted on the diving board is equal and opposite to the force pushing the person upward.
Which of the following is true about the use of electromagnetic waves in wireless technologies? Select TWO correct answers.
A. Radio waves are used to transmit signals over long distances.
B. Microwaves are ideal for transferring energy in solar panels.
C. Visible light is used in most wireless networks.
D. Electromagnetic waves can carry data through the air.
E. Gamma rays are used for high-speed data transmission.
A. Radio waves are used to transmit signals over long distances.
D. Electromagnetic waves can carry data through the air.
What are the three (3) different types of galaxies?
Spiral, Irregular, Elliptical
A student observes that water beads up on a freshly waxed car but spreads out on clean glass. Which reasoning best explains the difference in water behavior on these two surfaces?
A. Water has stronger surface tension than adhesion on wax, but stronger capillary action than cohesion on glass.
B. Water has stronger adhesion than cohesion on wax, but stronger cohesion than adhesion on glass.
C. Surface tension causes water to form beads on wax, while increased adhesion on glass causes it to spread.
D. Capillary action pulls water across the glass surface, while surface tension keeps it beaded on wax.
C. Surface tension causes water to form beads on wax, while increased adhesion on glass causes it to spread.
Iron (Fe) reacts with acetic acid (HC₂H₃O₂) to form iron(III) acetate [Fe(C₂H₃O₂)₃] and hydrogen gas (H₂).
2 Fe + 6 HC₂H₃O₂ → 2 Fe(C₂H₃O₂)₃ + 3 H₂
How many different elements are present in the chemical equation?
4
True or False. These are the correct definitions for the THREE Newton's Laws.
1. An object in motion, stays in motion and an object at rest stays at rest .
2. For every action there is an equal and opposite reaction.
3. Force = Mass x Acceleration
False.
In what way can electromagnetic waves contribute to radiation therapy for cancer treatment?
A. Gamma rays target and destroy cancer cells by damaging their DNA.
B. Ultraviolet rays are used to penetrate the skin and treat tumors deep inside the body.
C. Microwaves are used to heat tumors until they are destroyed.
D. Infrared waves are used to stimulate cellular repair.
A. Gamma rays target and destroy cancer cells by damaging their DNA.
What is CMB, and why is it important for the Big Bang Theory?
A. Radiation leftover from early stars; it shows how stars first formed.
B. Light that shows us the age of our galaxy.
C. Sound waves that tell us the size of the universe.
D. Radiation leftover from the Big Bang; provides evidence of the universe’s origin.
D. Radiation leftover from the Big Bang; provides evidence of the universe’s origin.