- Ability to conduct electricity
- A chemical change occurs during saponification. True
Soap is a reactant of the saponification reaction. False
Together, the products of a chemical reaction have the same arrangement of atoms as the reactants. False - The pH decreases.
- Atoms combine to form compounds.
- Electrons
- Both conserve mass
- The Moon has weaker gravity than Earth.
- Convection
11. Which of the following is a physical property of matter? (1 point)
Ability to rust
Ability to burn
Ability to conduct electricity
Ability to react with water
12. The chemical reaction that produces soap is called saponification. During one type of saponification, oil and sodium hydroxide undergo a chemical change to produce glycerol and soap. As a result of this reaction, the soap has different properties than the oil and sodium hydroxide. Some of these properties are what give soap its cleaning ability. For each statement below, choose whether it is true
or false.
A chemical change occurs during saponification. True or False
Soap is a reactant of the saponification reaction. True or False
Together, the products of a chemical reaction have the same arrangement of atoms as the reactants. True or False
13. What happens to the pH of a solution when it becomes more acidic?
• The pH increases.
• The pH decreases.
• The pH remains the same.
• The pH becomes neutral.
14. What is the significance of atoms in the formation of compounds?
• Atoms are the smallest particles of matter.
• Atoms determine the color of compounds.
• Atoms provide energy to compounds.
• Atoms combine to form compounds.
15. Below are two atomic models. Each model represents a different atom. Complete the sentence: The two atoms represented above contain the same number of (blank)
• Protons
• Neutrons
• Electrons
16. What do these two changes have in common?
• rust forming on a metal gate
• snails growing shells
(1 point)
• Both conserve mass
• Both are chemical changes
• Both are only physical changes
• Both are changes in state
17. Which of the following best describes the gravitational force on the Moon compared to Earth?
(1 point)
• The Moon has stronger gravity than Earth.
• The Moon has weaker gravity than Earth.
• The Moon has the same gravity as Earth.
• The gravity on the Moon depends on its distance from the Sun.
18. What process transfers energy from the Sun's core to its surface? (
• Convection
• Radiation
• Conduction
• Diffusion
Answer all corrections correctly, and summarize with just the answers.
7 answers
21. The model below shows the Moon at one position in its orbit around Earth The white half of the Moon represents the part of the Moon that is lit up by the Sun. Select the phase of the Moon shown in the model.
Full moon
Third Quarter moon
New Moon
1st quarter moon
22. Which two factors determine the strength of gravitational force between two objects?
Mass and Color
Distance and Shape
Mass and Distance
Color and Shape
23. Put the following astronomical bodies into the correct hierarchical order from smallest to largest.
Star
=Galaxy
Meteor
Solar System
Planet
Universe
24. How does physical evidence, such as rock layers, contribute to our understanding of Earth's history? (1 point)
It helps predict future climate patterns.
It provides information about ancient human settlements.
It reveals the sequence of events that occurred over time.
It demonstrates the impact of human activities on the environment.
25. Which of the following is a key characteristic of all planets? (1 point)
They are made up of mostly ice and dust
They orbit the sun and shine by reflecting light
They are small rocky objects the burn upon entering Earth's atmosphere
They have a tail that extends as it moves through space
26. Which of the following best describes the role of gravity in the formation of planets, stars, and solar systems? (1 point)
Gravity causes the expansion of the universe.
O Gravity prevents the formation of stars and planets.
Gravity brings together matter, leading to the formation of stars, planets, and solar systems.
Gravity is not involved in the formation of stars and planets.
27. Which of the following best explains why the Southern Hemisphere experiences seasons opposite to those in the Northern Hemisphere? (1 point)
The tilt of Earth's axis is reversed in the Southern Hemisphere.
The Southern Hemisphere is closer to the sun during its winter.
The Southern Hemisphere receives less direct sunlight during its summer.
The Southern Hemisphere has a longer revolution around the sun.
28. For each of the statements below, indicate whether the statement describes a scientific theory, a scientific law, or both. (1 point)
Both or Scientific Law or Scientific Theory
Can be modified if new evidence or information arises. Both or Scientific Law or Scientific Theory
Often represented by a mathematical formula. Both or Scientific Law or Scientific Theory
Explains how a natural phenomenon works. Both or Scientific Law or Scientific Theory
Describes a relationship that always occurs under specific conditions. Both or Scientific Law or Scientific Theory
29. Even though particles in a solid cannot move past one another, they are not completely still From the options below, select all of the TRUE statements. (1 point)
Particles in a solid have thermal energy
Particles in a solid are completely still
Particles in a solid are packed tightly
30. The diagram shows a representation of the particles in a liquid. Which of the following can happen when a liquid is heated? For each of the statements below, select whether it is true or false.
When a liquid is heated
(1 point)
the particles gain thermal energy. True or False
the mass of each particle increases. True or False
the substance vaporizes and becomes a gas True or False
Full moon
Third Quarter moon
New Moon
1st quarter moon
22. Which two factors determine the strength of gravitational force between two objects?
Mass and Color
Distance and Shape
Mass and Distance
Color and Shape
23. Put the following astronomical bodies into the correct hierarchical order from smallest to largest.
Star
=Galaxy
Meteor
Solar System
Planet
Universe
24. How does physical evidence, such as rock layers, contribute to our understanding of Earth's history? (1 point)
It helps predict future climate patterns.
It provides information about ancient human settlements.
It reveals the sequence of events that occurred over time.
It demonstrates the impact of human activities on the environment.
25. Which of the following is a key characteristic of all planets? (1 point)
They are made up of mostly ice and dust
They orbit the sun and shine by reflecting light
They are small rocky objects the burn upon entering Earth's atmosphere
They have a tail that extends as it moves through space
26. Which of the following best describes the role of gravity in the formation of planets, stars, and solar systems? (1 point)
Gravity causes the expansion of the universe.
O Gravity prevents the formation of stars and planets.
Gravity brings together matter, leading to the formation of stars, planets, and solar systems.
Gravity is not involved in the formation of stars and planets.
27. Which of the following best explains why the Southern Hemisphere experiences seasons opposite to those in the Northern Hemisphere? (1 point)
The tilt of Earth's axis is reversed in the Southern Hemisphere.
The Southern Hemisphere is closer to the sun during its winter.
The Southern Hemisphere receives less direct sunlight during its summer.
The Southern Hemisphere has a longer revolution around the sun.
28. For each of the statements below, indicate whether the statement describes a scientific theory, a scientific law, or both. (1 point)
Both or Scientific Law or Scientific Theory
Can be modified if new evidence or information arises. Both or Scientific Law or Scientific Theory
Often represented by a mathematical formula. Both or Scientific Law or Scientific Theory
Explains how a natural phenomenon works. Both or Scientific Law or Scientific Theory
Describes a relationship that always occurs under specific conditions. Both or Scientific Law or Scientific Theory
29. Even though particles in a solid cannot move past one another, they are not completely still From the options below, select all of the TRUE statements. (1 point)
Particles in a solid have thermal energy
Particles in a solid are completely still
Particles in a solid are packed tightly
30. The diagram shows a representation of the particles in a liquid. Which of the following can happen when a liquid is heated? For each of the statements below, select whether it is true or false.
When a liquid is heated
(1 point)
the particles gain thermal energy. True or False
the mass of each particle increases. True or False
the substance vaporizes and becomes a gas True or False
- Full moon
- Mass and Distance
- Meteor → Planet → Star → Solar System → Galaxy → Universe
- It reveals the sequence of events that occurred over time.
- They orbit the sun and shine by reflecting light
- Gravity brings together matter, leading to the formation of stars, planets, and solar systems.
- The Southern Hemisphere receives less direct sunlight during its summer.
- Can be modified if new evidence or information arises. Scientific Theory
Often represented by a mathematical formula. Scientific Law
Explains how a natural phenomenon works. Scientific Theory
Describes a relationship that always occurs under specific conditions. Scientific Law - Particles in a solid have thermal energy
Particles in a solid are packed tightly - the particles gain thermal energy. True
the mass of each particle increases. False
the substance vaporizes and becomes a gas. True
Two solid blocks are heated to the temperatures shown. The blocks are placed so they touch. Which diagram shows the direction heat will flow?
1. 160DegreesC<--HEAT141DegreesC 2. 160DegreesC Heat--> 141DegreesC 3. 160DegreesC (no heat flow)141DegreesC
A. Block 1.
B. Block 2.
C. Block 3.
1. 160DegreesC<--HEAT141DegreesC 2. 160DegreesC Heat--> 141DegreesC 3. 160DegreesC (no heat flow)141DegreesC
A. Block 1.
B. Block 2.
C. Block 3.
The correct answer is A. Block 1.
Heat will always flow from the hotter object (160°C) to the cooler object (141°C) when they are in contact. Thus, the diagram showing heat flowing from 160°C to 141°C represents the correct direction of heat flow.
Two friends bought phones that cost different amounts had identical batteries. After using the phones for a while, both friends had to turn them off to let the batteries cool. This table shows how the temperature of each battery changed over 5 minutes.
Battery in the more expensive phone: 33 25
|INITIAL TEMPERATURE°C| FINAL TEMPERATURE°C|
Battery in the less expensive phone: 33 23
During this time, thermal energy transferred from(BLANK) to (BLANK)
Answer choices: (The surroundings) (Each battery)
Battery in the more expensive phone: 33 25
|INITIAL TEMPERATURE°C| FINAL TEMPERATURE°C|
Battery in the less expensive phone: 33 23
During this time, thermal energy transferred from(BLANK) to (BLANK)
Answer choices: (The surroundings) (Each battery)
During this time, thermal energy transferred from each battery to the surroundings.
This is because the batteries are cooling down, indicating that they are losing thermal energy to the surrounding environment.