Matter And Energy Unit Test 1.5

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1.  Which model is used by scientists to determine the properties of elements?

Explanation

The Periodic Table is used by scientists to determine the properties of elements. It is a tabular arrangement of chemical elements, organized based on their atomic number, electron configuration, and recurring chemical properties. The table provides information about each element's atomic mass, symbol, atomic number, and other important characteristics. By referring to the Periodic Table, scientists can understand the properties of elements such as their reactivity, valence electrons, and physical states, which are crucial for conducting experiments and understanding the behavior of different substances.

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Matter And Energy Unit Test 1.5 - Quiz

Matter and Energy Unit Test 1.5 assesses knowledge on atomic structure, element properties, and molecular composition. It covers topics like atoms, the Periodic Table, element identification, and molecule... see morestructure, emphasizing fundamental chemistry concepts. see less

2. Which diagram best represents molecules of matter in the solid phase?

Explanation

Diagram 2 best represents molecules of matter in the solid phase because the molecules are tightly packed together in a regular, organized pattern. This arrangement is characteristic of solids, where the molecules have strong attractive forces holding them in place and vibrating in fixed positions. Diagrams 1, 3, and 4 show molecules that are either too spread out or not in a regular pattern, which are not characteristic of solids.

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3. The tiny particles that make up all matter are called

Explanation

Atoms are the tiny particles that make up all matter. They are the basic building blocks of everything in the universe, including genes, minerals, and cells. Genes are segments of DNA that contain instructions for building proteins, not particles of matter. Minerals are naturally occurring inorganic substances, but they are composed of atoms. Cells are the basic units of life, but they are made up of atoms as well. Therefore, atoms are the correct answer as they are the fundamental particles that make up all matter.

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4.  Which substance is usually found in nature as a liquid, solid, and gas?

Explanation

Water is usually found in nature as a liquid, solid, and gas. In its liquid form, it is commonly seen in lakes, rivers, and oceans. It can also exist as a solid in the form of ice, which is found in glaciers and polar regions. Additionally, water can be present as a gas in the form of water vapor, which is found in the atmosphere. This versatility in its states of matter is due to the unique properties of water molecules, such as hydrogen bonding.

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5.  Hydrochloric acid is added to a beaker containing a piece of zinc. As a result, zinc chloride is formed and hydrogen gas is released. This is an example of

Explanation

When hydrochloric acid is added to zinc, a chemical reaction occurs. The hydrochloric acid reacts with the zinc to form zinc chloride, a new substance, and hydrogen gas is released. This is a clear indication of a chemical reaction taking place, as new substances are formed and there is a release of gas. A physical change, on the other hand, does not result in the formation of new substances. Photosynthesis and evaporation are unrelated processes and do not apply to this situation.

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6. Which form of energy is needed to change water from a liquid to a gas?

Explanation

When water changes from a liquid to a gas, it undergoes the process of evaporation. This requires the input of energy in the form of heat. Heat energy is absorbed by the water molecules, causing them to gain enough energy to break the intermolecular forces holding them together and transform into a gaseous state.

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7.  A student crumples up a sheet of paper.  Which property of the paper has changed?

Explanation

The correct answer is shape because when the student crumples up the sheet of paper, its physical appearance changes from being flat to having a different form or structure. The paper no longer retains its original shape and has been altered in terms of its arrangement or configuration.

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8.  When a person speaks into a telephone, sound energy is changed mostly into which form of energy?

Explanation

When a person speaks into a telephone, the sound energy is converted mostly into electrical energy. This is because the sound waves produced by the person's voice cause the microphone in the telephone to vibrate. These vibrations are then converted into electrical signals that can be transmitted through the telephone lines.

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9. A wet shirt is put on a clothesline to dry on a sunny day. The shirt dries because water molecules

Explanation

On a sunny day, the shirt dries because the water molecules in the shirt gain heat energy from the sun. This increase in heat energy causes the water molecules to evaporate, meaning they transform from a liquid state to a gaseous state. As the water molecules evaporate, they leave the shirt, resulting in the shirt drying.

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10.  The elements on the Periodic Table are arranged in order of increasing

Explanation

The elements on the Periodic Table are arranged in order of increasing atomic number. This is because the atomic number represents the number of protons in an atom's nucleus, which determines its identity as a specific element. By arranging the elements in order of increasing atomic number, the Periodic Table allows for a systematic organization of elements based on their properties and characteristics.

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11.  The table below shows the chemical symbols for some common elements. Based on the information in the table, which of the four substance below is a compound?   

Explanation

The chemical symbol CO represents the compound carbon monoxide. A compound is a substance composed of two or more elements chemically combined in a fixed ratio. In this case, carbon (C) and oxygen (O) are combined to form carbon monoxide (CO). Therefore, CO is the only substance among the options provided that is a compound.

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12. Some common substances and their chemical formulas are listed in the chart below. Which of these substances are elements?

Explanation

The substances helium and oxygen are elements because they cannot be broken down into simpler substances by chemical means. Hydrochloric acid and carbonic acid are not elements, as they are compounds made up of multiple elements. Carbon dioxide and water are also compounds, consisting of carbon and oxygen, and hydrogen and oxygen respectively.

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13. Which statement is true about the charges assigned to an electron and a proton?

Explanation

An electron is negatively charged because it has a surplus of negative particles called electrons. On the other hand, a proton is positively charged because it has a surplus of positive particles called protons. Therefore, the statement that an electron is negative and a proton is positive is true.

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14.  Which graph correctly shows the effect of heat energy on the motion of molecules of matter?

Explanation

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15. The four diagrams below model the results of mixing atoms of different substances. Each atom is represented by a different symbol. Which diagram correctly models a chemical change?

Explanation

In diagram 2, the symbols representing the atoms are rearranged, indicating that a chemical change has occurred. In the other diagrams, the symbols remain the same, suggesting that no chemical change has taken place.

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16.  Which statement best describes the property of light waves illustrated in the diagram below?

Explanation

The diagram shows a light wave passing through a material and changing direction. This phenomenon is known as refraction. Refraction occurs when light waves travel from one medium to another with a different optical density, causing the waves to bend. Therefore, the correct answer is "Light waves are refracted by some materials."

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17.  The diagram below shows the geometric structure of a molecule of water (H2O).  What do the symbols    and    represent in the model?

Explanation

The symbols in the model represent atoms. In the diagram, "H" represents a hydrogen atom and "O" represents an oxygen atom. These atoms are arranged in a specific geometric structure to form a molecule of water (H2O).

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18. Which observation would be evidence that the water is undergoing a phase change?

Explanation

The water level in the glass of water decreases is evidence that the water is undergoing a phase change because when water evaporates and changes from a liquid to a gas, the level of water in a container will decrease.

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19.  The diagram below shows a boy observing a fish located at position B below the surface of the water. The boy sees the fish at position A. The apparent position of the fish is different from the actual position of the fish. What has happened to the light passing through the water to cause this difference?

Explanation

When light passes from one medium (such as air) to another medium (such as water) with a different refractive index, it changes direction. This phenomenon is called refraction. In this case, when the light from the fish travels from the water to the air, it bends away from the normal (the line perpendicular to the surface of the water). As a result, the apparent position of the fish appears higher than its actual position, causing the boy to see the fish at position A instead of position B.

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20. Which diagram represents electromagnetic energy with the shortest wavelength?

Explanation

The diagram B represents electromagnetic energy with the shortest wavelength because the wavelength is inversely proportional to the energy. In the electromagnetic spectrum, shorter wavelengths correspond to higher energy. Therefore, diagram B, which has the shortest wavelength among the given options, represents electromagnetic energy with the highest energy level.

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21. A common characteristic of sound waves is that they

Explanation

Sound waves are created by vibrations because sound is a mechanical wave that requires a medium to travel through. When an object vibrates, it creates disturbances in the surrounding medium, which propagates as sound waves. These waves consist of compressions and rarefactions that travel through air, water, or any other medium, allowing us to hear sound. Therefore, the statement "are created by vibrations" accurately describes the common characteristic of sound waves.

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22.  The picture below shows a ringing bell inside a vacuum jar. As air is pumped from the vacuum jar, the sound level of the ringing bell will decrease until it can no longer be heard. This happens because air must be present in the jar in order for

Explanation

When air is pumped out of the vacuum jar, the sound level of the ringing bell decreases because sound requires a medium, such as air, to travel through. In the absence of air, there are no particles to vibrate and carry the sound waves, resulting in the sound becoming fainter and eventually disappearing.

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23. How is heat energy transferred within the liquid water in the pond?

Explanation

Convection currents are the correct answer because heat energy is transferred within liquid water in a pond through the movement of the water itself. As the water near the bottom of the pond is heated, it becomes less dense and rises to the surface, while the cooler water near the surface sinks to the bottom. This creates a continuous circulation of water, which allows heat energy to be transferred throughout the pond. This process is known as convection and is a common method of heat transfer in fluids.

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24.  Sound will not travel in a

Explanation

Sound requires a medium to travel through, such as air, water, or solids. In a vacuum, there is no medium for sound waves to propagate, so sound cannot travel. This is because sound waves are mechanical waves that rely on the vibration of particles in a medium to transmit energy. In the absence of particles, as in a vacuum, there is no medium for the sound waves to pass through, resulting in the inability of sound to travel.

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 Which model is used by scientists to determine the properties of...
Which diagram best represents molecules of matter in the solid phase?
The tiny particles that make up all matter are called
 Which substance is usually found in nature as a liquid, solid,...
 Hydrochloric acid is added to a beaker containing a piece of...
Which form of energy is needed to change water from a liquid to a gas?
 A student crumples up a sheet of paper.  Which property of...
 When a person speaks into a telephone, sound energy is changed...
A wet shirt is put on a clothesline to dry on a sunny day. The shirt...
 The elements on the Periodic Table are arranged in order of...
 The table below shows the chemical symbols for some common...
Some common substances and their chemical formulas are listed in the...
Which statement is true about the charges assigned to an electron and...
 Which graph correctly shows the effect of heat energy on the...
The four diagrams below model the results of mixing atoms of different...
 Which statement best describes the property of light waves...
 The diagram below shows the geometric structure of a molecule of...
Which observation would be evidence that the water is undergoing a...
 The diagram below shows a boy observing a fish located at...
Which diagram represents electromagnetic energy with the shortest...
A common characteristic of sound waves is that they
 The picture below shows a ringing bell inside a vacuum jar....
How is heat energy transferred within the liquid water in the pond?
 Sound will not travel in a
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