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What does density anomaly mean?
Density anomaly refers to a situation where a substance does not follow the expected pattern of increasing or decreasing in density as temperature changes. Water is a classic example of a substance with a density anomaly, where it reaches its maximum density at 4°C before decreasing in density as it freezes into ice.
Is boiling point and melting point able to change for a pure substance?
Neither are actually points as such, but lines on a scale comparing temperature and pressure. Increase one and the size of the other goes up as well before the material will change state. So in effect, yes, the points do change, depending on the environment they are in at the time.
Why the melting point of a substance is a physical property but flammability is a chemical property?
When a substance melts, it changes state from solid to liquid. This does not alter the substance's chemical composition, so melting point is a physical property. Flammability means burning, and when a substance burns, it reacts with oxygen to produce a new substance that was not there before. This is therefore a chemical property.
Why she dips the themometer in a liquid before use?
She dips the thermometer in a liquid before use to ensure accurate temperature readings. This process helps to calibrate the thermometer and eliminate any potential air pockets that could affect the measurement. Additionally, it can help stabilize the temperature of the thermometer itself, ensuring that it quickly adapts to the temperature of the substance being measured.
What are 4 phicical changes?
A physical change is a substance that changes, and has the ability to change back into the same substance it was before. So signs of a physical change is: a) phase change b) shape change etc.....
Which substance has the highest specific heat?
Water has the highest specific heat capacity of any common substance. This means it can absorb a large amount of heat energy before its temperature changes significantly. This property of water helps regulate Earth's climate and moderates temperature changes in both aquatic and terrestrial environments.
What is the temperature at which a substance changes from a liquid state to gas?
The boiling point It is called boiling point, where all the liquid turns into gas at this one temperature (if the substance is pure). However, there are exceptions like water (they can evaporate so it can turn into gas before reaching boiling point of 100 degrees Celsius)
What does density anomaly mean?
Density anomaly refers to a situation where a substance does not follow the expected pattern of increasing or decreasing in density as temperature changes. Water is a classic example of a substance with a density anomaly, where it reaches its maximum density at 4°C before decreasing in density as it freezes into ice.
Does the temperature of a substance change before the change of state is complete?
No. During a phase change the temperature is constant until the phase change is complete.
What is the state of matter just before a substance boils?
The state of matter just before a substance boils is typically a liquid. As the substance is heated, its temperature rises until it reaches the boiling point, at which point it starts vaporizing into a gas.
What happens to the temperature of naphthalene during melting?
Lab: Melting / Freezing Point of NaphthaleneObjective: In this lab, you will investigate the melting and freezing point of the substance, naphthalene (moth ball flakes). You will heat solid naphthalene and record temperature changes and examine the graph to determine the melting point of the substance. You will then cool naphthalene and record temperature changes in order to determine the Freezing point of the substance Part A: What happens to temperature as naphthalene melts?Objective: As heat is applied to liquid naphthalene, the temperature rises. As the temperature rises, the naphthalene will eventually start to melt. This lab experiment tries to answer the question: what happens to the temperature of naphthalene as it melts? In this lab, you will heat the liquid naphthalene, and record the temperature changes. You will graph the temperature changes before drawing any conclusions.Part B: Determining the freezing point of naphthaleneObjective: Freezing point is a characteristic property of matter. As heat is taken away from a liquid, the temperature of that liquid decreases as the substance begins to freeze. This lab experiment tries to answer the question: what is the freezing point of an unknown liquid (naphthalene)? In this lab, you will cool liquid naphthalene, and record the temperature changes. You will graph the temperature changes before drawing any conclusions.
How can you tell if something is a good insulator based on its specific heat?
Specific heat is a measure of how much heat energy a substance can absorb before its temperature changes. Typically, substances with higher specific heat are better insulators because they can absorb more heat energy without changing temperature quickly. Therefore, a substance with a higher specific heat is usually a good insulator.
What are the physical appearance of NaCl before heating?
Sodium chloride at room temperature is a crystalline transparent substance.
Name a substance that needs a lot of energy to raise its temperature?
Water is a substance that requires a lot of energy to raise its temperature because it has a high specific heat capacity. This means it can absorb a significant amount of heat energy before its temperature increases.
Why do insects move inside before a storm?
Insects move inside before a storm comes due to temperature changes. They can sense a drop in temperature before the approaching storm hits and seek warm shelter.
Does a substance change mass if it changes physically?
No. Mass is a measure of how much matter is in an object, and that does not change when the matter changes states. The matter will either contract or expand, depending on the current state and the state to be reached, but that does not change how much matter is in the object.
Why doesnt liquids stay solid?
it is because of of room temperature Every substance has a particular temperature it has to be before it changes from one state of matter (gas, solid, and liquid) to another. For example, water changes from ice(solid) to liquid water when it's temperature rises above 0 degrees Celsius (32 degrees F), and it changes from a liquid to water vapor (gas) when it rises above 100 degrees Celsius (212 degrees F). The temperature different liquids require to change to either solid or gas depends on the particular liquid's freezing/boiling point.
