1.
An extensive property of matter is a property that depends on how much matter you have. For example, how much volume5 of water you have depends on how much water you have. In the picture below, you have 6.6 mL of water because that's how much you've got.
Of the following, which are examples of extensive properties? Which are not? Explain.
color, mass8, weight, texture
2.
Read the first 3 definitions for matter1,2,3. These are the scientific definitions for matter. Which of the following is an example of matter?
Correct Answer
C. Water
Explanation
Matter is anything that is made up of stuff and occupies space. Water is made up of a combination of hydrogen and oxygen molecules and takes up space, depending how much of it you have.
3.
If we burn the paper (NO! DO NOT BURN THE PAPER! - I'm just saying, hypothetically speaking), will we be left with paper? The answer should be no. In no way is what we have left after burning paper still paper. Burning something or doing something that changes the material is called a chemical change. Which of the following are examples of a chemical change? When looking through the choices, ask yourself, is what I end up with the same as what I started with? Also, the following are signs of a chemical change:1. transfer of energy2. change in color3. production of a gas4. formation of a precipitate, as solid that forms and settles out of a liquid
Correct Answer(s)
A. Frying an egg
C. Lighting a match
D. Mixing baking soda and vinegar
Explanation
Frying an egg is a chemical change, it changes color.
Freezing water to form ice is not a chemical change; ice is just the solid form of water.
Lighting a match and mixing baking soda and vinegar are chemical changes.
Painting a wall is not a chemical change. It doesn't change the wall itself even though the color changed, the color is still the paint.
4.
On a hot
sunny day, ice cream will transform from a solid to a liquid. What
phase change did the ice cream experience?
Correct Answer
B. Melting
Explanation
On a hot sunny day, the ice cream would experience a phase change from a solid to a liquid. This process is known as melting. As the temperature rises, the ice cream absorbs heat energy from its surroundings, causing the solid ice cream to break down and transform into a liquid state. This change in phase is commonly observed when substances transition from a solid to a liquid due to an increase in temperature.
5.
In order
for a liquid to change into a solid, the object must ______________
thermal energy.
Correct Answer
B. Lose
Explanation
To change from a LIQUID to a SOLID, thermal energy is lost.
Particles vibrate slower thus reducing the temperature. Liquid particles move slower and slower until they become fixed in place, becoming a solid
6.
Matter
changes state when a sufficient amount of thermal energy changes.
Correct Answer
A. True
Explanation
Matter changes state when the amount of thermal energy
increases or decreases.
7.
Matter is
anything that has mass and takes up space.
Correct Answer
A. True
Explanation
The statement is true because matter is defined as anything that has mass and takes up space. This means that any physical substance, whether it is solid, liquid, or gas, is considered matter. Matter can be observed and measured, and it is composed of tiny particles called atoms and molecules. Therefore, anything that meets the criteria of having mass and occupying space can be classified as matter.
8.
What phase
change does dry ice undergo when it transforms from a solid to a gas,
skipping the liquid phase entirely?
Correct Answer
C. Sublimation
Explanation
Sublimation is a physical change from a SOLID to a GAS. The solids do not pass through liquid phase; they immediately transform into a gas.
9.
All matter
melts at the same temperature.
Correct Answer
B. False
Explanation
The temperature at which matter melts is called the melting point. All matter has a unique melting point.
10.
What
happens to the speed in which particles move when the change from a
liquid to a solid?
Correct Answer
B. Particles speed decreases
Explanation
When an object changes from a liquid to a solid, the object loses thermal energy, therefore the particles begin to move slower and slower until the object changes phases.
11.
The temperature
at which matter changes from a solid to a liquid is called the _________
point.
Correct Answer
B. Melting
Explanation
The temperature at which matter changes from a solid to a liquid is called the melting point.
12.
The beads
of sweat on the outside of your cup come from the water vapor in the
air. What phase change did the water vapor have to undergo to become
the dew drops on the outside of your cup?
Correct Answer
B. Condensation
Explanation
Condensation occurs when water vapor loses thermal energy and condenses into liquid.
13.
What phase
change will the surface water on a mud puddle undergo on a hot day?
Correct Answer
C. Evaporation
Explanation
Evaporation is a phase change from a liquid to a gas which takes place on the surface of the liquid.
14.
Melts easily
Correct Answer
A. Chemical
Explanation
The fact that something "melts easily" suggests that it undergoes a chemical change rather than a physical change. Physical changes, such as changes in state (solid to liquid), are reversible and do not alter the chemical composition of the substance. On the other hand, chemical changes involve the breaking and forming of chemical bonds, resulting in a new substance with different properties. Melting easily implies that the substance is undergoing a chemical reaction, where the bonds holding its particles together are being broken, leading to a change in its physical state.
15.
Burns in air
Correct Answer
A. Chemical
Explanation
The given correct answer is "chemical" because burning in air is a chemical reaction. When a substance undergoes combustion in the presence of oxygen, it reacts with oxygen to produce new substances and release energy. This process involves breaking and forming chemical bonds, resulting in a chemical change. Therefore, burning in air is considered a chemical reaction rather than a physical change.
16.
Classify the following questions as either chemical or physical CHANGES:
Question: Ice melting in a drink
Correct Answer
B. pHysical change
Explanation
The given question is asking whether the process of ice melting in a drink is a chemical or physical change. The correct answer is "physical change." This is because when ice melts, it undergoes a phase change from a solid to a liquid without any alteration in its chemical composition. The molecules in the ice simply gain enough energy to break their rigid structure and move more freely, resulting in the formation of liquid water. Therefore, no new substances are formed, indicating a physical change rather than a chemical one.
17.
Sugar added to lemonade
Correct Answer
A. Chemical change
Explanation
The addition of sugar to lemonade results in a chemical change. When sugar is added to lemonade, it dissolves in the liquid and undergoes a chemical reaction with the water molecules. This reaction breaks down the sugar molecules into smaller components, such as glucose and fructose. This change is irreversible, as the sugar molecules have been transformed into different substances. Therefore, the addition of sugar to lemonade is an example of a chemical change.
18.
What is the phase of water when its temperature is 150°C?
Correct Answer
C. Gas
Explanation
At 150°C, water is in the gas phase. This is because water boils and turns into steam at 100°C, and at higher temperatures, it remains in the gas phase. The water molecules gain enough energy to break the intermolecular forces and escape into the air as water vapor. Therefore, the correct answer is gas.
19.
A substance has a definite composition. In other words, a substance is just a bunch of the same stuff. For example, if you have a glass of water, water from the middle of the glass is the same as water in the middle of the glass is the same as water at the bottom of the glass.
Which of the following are examples of substances? HINT: select ALL of the correct answers.
Correct Answer(s)
B. Aluminum foil
C. Sugar
D. Oil
Explanation
Aluminum foil, sugar, and oil are examples of substances because they have a definite composition. They are made up of the same type of molecules throughout, regardless of their location or form. Chicken noodle soup and chocolate cookies, on the other hand, are mixtures that contain different substances combined together.
20.
What is the phase of matter represented in this image?
Correct Answer
C. Gas
Explanation
Gases do not have a definite shape or volume. The particles are free to move to fill the container they are in.
21.
In which phase of matter, are the particles able to move freely about each other but do not have a definite shape?
Correct Answer
B. Liquid
Explanation
Liquids have a definite volume but they do NOT have a definite shape. The molecules take shape of the container they are in. The molecules move by sliding past each other freely.
22.
Which phase of matter has a definite volume and shape?
Correct Answer
A. Solid
Explanation
Solid particles are packed close together giving them a fixed shape and a definite volume.
23.
A physical change is a change that occurs when a substance changes composition by forming one or more new substances
Correct Answer
B. False
Explanation
A physical change is a change that occurs when a substance undergoes a change in its physical properties, such as shape, size, or state, without forming any new substances. In a physical change, the composition of the substance remains the same even though its appearance or properties may be altered. Therefore, the given statement that a physical change occurs when a substance changes composition by forming one or more new substances is incorrect.
24.
- Color change is evidence that a chemical change may have occurred
Correct Answer
B. False
Explanation
Color change is not always evidence that a chemical change may have occurred. While some chemical reactions do result in a color change, there are also many other factors that can cause a change in color, such as the presence of impurities or changes in the physical state of a substance. Therefore, the occurrence of a color change alone is not sufficient evidence to conclude that a chemical change has taken place.
25.
- Fizzing or foaming is evidence that a chemical change may have occurred.
Correct Answer
A. True
Explanation
Fizzing or foaming is often observed when a chemical change occurs. This is because certain chemical reactions produce gases as a byproduct, which can cause the formation of bubbles or foam. This release of gas is a clear indication that a chemical reaction is taking place, making the statement true.
26.
- Production of light is evidence that a physical change may have occurred.
Correct Answer
A. True
Explanation
The production of light is evidence of a physical change because it is a visible manifestation of energy being transformed. Light is a form of energy, and when it is produced, it indicates that there has been a conversion or transformation of energy, which is a characteristic of a physical change. Physical changes involve alterations in the physical properties or state of a substance, without any change in its chemical composition. The production of light can occur through various physical processes such as combustion, electrical discharge, or luminescence, all of which involve the conversion of energy and are therefore evidence of a physical change.
27.
What phases are shown in the three images below?
Correct Answer
B. Image 1 is liquid, image 2 is solid, and image 3 is gas.
Explanation
The answer is correct because in image 1, the particles are close together and can move past each other, indicating a liquid phase. In image 2, the particles are tightly packed and have a fixed shape, indicating a solid phase. In image 3, the particles are far apart and moving freely, indicating a gas phase.
28.
An unopened bottle of water is taken out of the refrigerator and placed on a table. After a while, the bottle is covered with droplets of water. What phase change has occurred?
Correct Answer
D. Condensation
Explanation
When a cold bottle of water is taken out of the refrigerator and placed on a table, the surrounding air is warmer than the temperature of the bottle. As a result, the air around the bottle cools down and cannot hold as much moisture. This causes the water vapor in the air to condense into liquid water droplets on the surface of the bottle, leading to the formation of droplets. Therefore, the phase change that has occurred is condensation.
29.
Molten lava pours from a volcano in Hawaii. After a few hours, the liquid lava hardens into a shiny gray rock. Which phase change has taken place?
Correct Answer
B. Freezing
Explanation
The correct answer is freezing. Freezing is the phase change that occurs when a substance changes from a liquid to a solid. In this case, the molten lava, which was in a liquid state, hardens into a solid rock after a few hours.