Chemistry
A model of an atom contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus.
Which statements best describe the charges on the particles in this model?
A Both particles X and Y have a positive charge. Particle Z has a negative charge.
B Both particles X and Y have a negative charge. Particle Z has a positive charge.
C Either particle X or particle Y has a positive charge. Particle Z has a negative charge.
D Either particle X or particle Y has a negative charge. Particle Z has a positive charge.
C Either particle X or particle Y has a positive charge. Particle Z has a negative charge.
Which of the following objects is not accelerating?
A A box slows down as it slides across the floor.
B A ball begins to speed up as it is pushed by a student.
C A car drives straight down the street at a constant speed.
D A planet revolves around a star in a circular orbit.
C A car drives straight down the street at a constant speed.
1. 25% light shown as it grows
2. Directly after a waning crescent
3. 75% light shown as it shrinks
1. Waxing Crescent
2. New Moon
3. Waning Gibbous
Students view two different cells under a microscope. They record their observations in the table shown.
Cell 1-Vacuole, Nucleus, Cell Membrane
Cell 2-Vacuole, Nucleus, Chloroplast, Cell Wall
Based on the organelles observed, which cell is a plant cell and how do you know?
Cell 2 is a plant cell because it contains chloroplast and a cell wall.
What should you use scratch paper for on testing day?
Brain Dump!
Which elements have the same number of energy levels as lithium?
Beryllium
Sodium
Magnesium
Potassium
Fluorine
Beryllium and Fluorine
According to Newton’s 3rd law of motion, when two continental plates meet and push on one another, the smaller of the two plates will push back on the larger plate with a force that is -
A less than the larger plate but in the opposite direction.
B equal in size to the force of the larger plate but opposite in direction.
C equal in size to the force of the larger plate and in the same direction.
D greater than the larger plate and in the same direction.
B equal in size to the force of the larger plate but opposite in direction.
Which statement best explains why the sun appears brighter to people on Earth than any other star?
F Sunlight reaches Earth’s atmosphere at an angle that causes the sun’s light rays to intensify.
G Unique chemical reactions in the sun’s core produce a high-energy wavelength of light.
H The sun burns at a higher temperature than any other star.
J The sun is closer to Earth than any other star.
J The sun is closer to Earth than any other star.
What function do both cell membranes and cell walls perform?
F Producing energy for cellular processes
G Allowing water to move into and out of cells
H Synthesizing genetic material
J Directing the reproduction of the cell
G Allowing water to move into and out of cells
Which type of boundary results in the spreading of the oceanic ridge?
A Convergent boundary
B Subduction boundary
C Transform boundary
D Divergent boundary
D Divergent boundary
Which of these observations is an indication that a chemical reaction has occurred?
A Steam forms above boiling water.
B A solid forms when a clear solution is frozen.
C A solid forms when two clear solutions are mixed.
D Sugar crystals form on the sides of a boiling pot of sugar water.
C A solid forms when two clear solutions are mixed.
A sledgehammer has a mass of 3.0 kilograms. What net force, to the nearest whole newton, will a person need to apply to accelerate the sledgehammer at a rate of 4.0 m/s2?
12 Newtons
The Milky Way galaxy is described as a disk of stars orbiting a central point on the disk. Which of these best explains why people on Earth cannot see the entire shape of the Milky Way?
A Earth is a part of this galaxy.
B Many more stars exist outside the galaxy.
C The stars in the center of the galaxy are extremely small.
D The center of the galaxy consists of a dense cluster of stars.
A Earth is a part of this galaxy.
Students jump rope for one minute to determine changes in heart rate and breathing rate. Which answer explains the functions of the two body systems that the students investigated?
A. Circulatory to add oxygen gas to blood and remove carbon dioxide gas and skeletal to sense and respond to changes in the body and environment.
B. Circulatory to pump blood around the body to carry nutrients, oxygen, and wastes and respiratory to add oxygen and remove carbon dioxide from the blood.
C. Nervous to support the muscles and protect organs and respiratory to pump blood around the body to carry nutrients, oxygen, and wastes.
D. Skeletal to protect organs, support body, and attach to muscles for movement and nervous to sense and respond to changes in the body and environment.
B. Circulatory to pump blood around the body to carry nutrients, oxygen, and wastes and respiratory to add oxygen and remove carbon dioxide from the blood.
Which of these is the best description of the action-reaction force pair when the space shuttle lifts off from the launchpad?
A The ground pushes the rocket up while exhaust gases push down on the ground.
B Exhaust gases push down on air while the air pushes up on the rocket.
C The rocket pushes exhaust gases down while the exhaust gases push the rocket up.
D Gravity pulls the rocket exhaust down while friction pushes up against the atmosphere.
C The rocket pushes exhaust gases down while the exhaust gases push the rocket up.
Sodium and lithium have similar chemical properties.
What characteristic of these elements explains why they are chemically similar?
F Their atoms both have one valence electron.
G Their atoms both have more neutrons than protons.
H Their atoms have the same number of energy levels.
J Their atoms contain equal numbers of protons and electrons.
F Their atoms both have one valence electron.
Four students designed and built air propelled rockets that were launched into the air. Their data are recorded in the table.
Rocket 1 Mass: 0.528 kg Net Force: 12.0 N
Rocket 2 Mass: 0.426 kg Net Force: 8.0 N
Rocket 3 Mass: 0.515 kg Net Force: 12.0 N
Rocket 4 Mass: 0.477 kg Net Force: 8.0 N
Which rocket had the greatest acceleration?
Rocket 3
Which of these correctly compares the masses of different objects in the universe?
F A moon has less mass than a star and more mass than the planet it orbits.
G A planet has less mass than a galaxy and more mass than the star it orbits.
H A galaxy has less mass than a moon and more mass than a planet.
J A star has less mass than a galaxy and more mass than a planet.
J A star has less mass than a galaxy and more mass than a planet.
Below is a list of fictional organisms. Using the clues, place these organisms into their correct positions in an energy pyramid.
1. Oomphs have teeth adapted to grinding and crushing plant material.
2. Prawls have claws and pointed teeth that are adapted for hunting animals.
3. Quacks have purple feathers and sharp talons and beaks.
4. The quacks have 10 times less stored energy than the prawls.
5. Listerbeeds have the ability to convert solar energy into chemical energy.
Keep your boards up! I'm coming around to check.
A photograph of a litter of six-week-old bulldog puppies shows that the puppies are not identical.
Even though these puppies have the same parents, they do not all look alike because —
A they were produced by asexual cloning
B some of the puppies have genetic material from only one of the parents
C each puppy has a different combination of genetic material as a result of sexual reproduction
D all the puppies developed from the same fertilized egg
C each puppy has a different combination of genetic material as a result of sexual reproduction
Oxygen and oxygen-containing compounds are involved in many different reactions. Which balanced equation represents a reaction that involves 14 atoms of oxygen?
F NH4Cl+KOH → NH3 +H2O+KCl
G 2Na+2H2O → 2NaOH+H2
H 2C2H6+7O2 → 4CO2+6H2O
J 4Fe+3O2 → 2Fe2O3
H 2C2H6+7O2 → 4CO2+6H2O
Seat belts in cars help prevent passenger injuries that would otherwise occur when a car came to an abrupt stop during a traffic accident. Which of these statements best explains why seat belts in cars are so important for passenger safety?
A An object at rest does not contain kinetic energy.
B The acceleration due to Earth’s gravity is 9.8 m/s2.
C Applying a constant force on an object will cause its speed to increase.
D An object in motion will stay in motion unless acted on by a net force.
D An object in motion will stay in motion unless acted on by a net force.
If there was a New Moon on December 30, approximately when would we have our next 1st quarter?
A. January 14
B. January 6
C. January 30
D. February 30
B. January 6
Below is a list of fictional organisms. Using the clues, place these organisms into their correct positions in the food web.
1. Aberlillies get their energy from a nearby star.
2. Unglebobs are very slow animals that hunt by spraying their prey with a strong toxin that immediately paralyzes them.
3. Scruttles are blue with green spots and yellow eyes.
4. Unglebobs also consume vegetation.
5. Cabbits are fast, intelligent animals which have adapted to their environment by becoming immune to Unglebobs’ toxin.
6. Bantlers are strict herbivores.
7. Whameleons have adapted a very effective camouflage. Because of this they are the only animals able to effectively hunt the quick, smart Cabbits.
Don't answer yet! I'm going to help you set up your food web.
Keep your boards up, I will check!
The chart shows properties of four elements.
Element 1-shiny, conducts electricity and heat
Element 2-dull, does not conduct electricity and heat
Element 3-shiny, conducts some electricity and heat but not all
Element 4-dull, conducts electricity and heat
Based on these properties, which element is most likely a nonmetal?
Element 2