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Specific Heat Capacity Homework Answers


<h1>Specific Heat Capacity Homework Answers: How to Solve Them Easily</h1>


<p>If you are struggling with specific heat capacity homework problems, you are not alone. Specific heat capacity is a concept that involves physics, chemistry and thermodynamics, and it can be quite challenging to understand and apply. However, with some basic knowledge and practice, you can learn how to solve specific heat capacity homework problems easily and confidently. In this article, we will explain what specific heat capacity is, why it is important, how to find it and how to use it in different situations.</p>




Specific Heat Capacity Homework Answers



<h2>What is specific heat capacity?</h2>


<p>Specific heat capacity, also called specific heat, is a physical property of a substance that measures how much heat energy is needed to raise the temperature of one gram of that substance by one degree Celsius (or one Kelvin). It is represented by the symbol c or C, and it has units of Joules per gram per degree Celsius ( \\text J/g^\\circ\\text C J/gC) or Joules per gram per Kelvin ( \\text J/g\\text K J/gK ). The higher the specific heat capacity of a substance, the more heat energy it can absorb or release without changing its temperature significantly. For example, water has a high specific heat capacity of 4.18 \\text J/g^\\circ\\text C 4.18J/gC , which means that it takes a lot of heat energy to increase or decrease its temperature. This is why water can moderate the climate and keep the temperature stable.</p>


<h3>Molar specific heat capacity</h3>


<p>Sometimes, instead of using the mass of a substance in grams, we use the amount of a substance in moles. A mole is a unit that represents 6.02 10 ^23^ atoms or molecules of a substance. The molar specific heat capacity is how much heat energy is needed to raise the temperature of one mole of a substance by one degree Celsius (or one Kelvin). It is represented by the symbol c_m \\text c_m c_m or C_m \\text C_m C_m , and it has units of Joules per mole per degree Celsius ( \\text J/mol^\\circ\\text C J/molC) or Joules per mole per Kelvin ( \\text J/mol\\text K J/molK ). The molar specific heat capacity can be calculated by multiplying the specific heat capacity by the molar mass of the substance. For example, the molar mass of water is 18.01 \\text g/mol g/mol , so the molar specific heat capacity of water is 4.18 18.01 = 75.28 \\text J/mol^\\circ\\text C J/molC .</p>


<h2>Why is specific heat capacity important?</h2>


<p>Specific heat capacity is important because it tells us how much heat energy a substance can store or release when its temperature changes. This has many applications in science and engineering, such as designing heating and cooling systems, calculating thermal energy transfer, studying phase changes and chemical reactions, and understanding natural phenomena such as climate change and ocean currents. For example, if we want to design a heating system for a house, we need to know the specific heat capacities of the materials used in the house, such as wood, metal and glass. This will help us determine how much heat energy is needed to warm up or cool down the house and how efficient the heating system is.</p>


<h2>How to find specific heat capacity?</h2>


<p>There are two main ways to find specific heat capacity: using a table or using an equation.</p>


<h3>Using a table</h3>


<p>The easiest way to find specific heat capacity is to use a table that lists the values for different substances at standard conditions (25 ^\\circ\\text C C and 1 atm). You can find such tables online or in textbooks . However, you should be aware that these values are not exact and may vary depending on the temperature, pressure and purity of the substance. Therefore, you should use them as estimates and not as precise measurements.</p>


<h3>Using an equation</h3>


<p>The other way to find specific heat capacity is to use an equation that relates it to other variables such as heat energy, mass and temperature change. The equation is:</p>


<p>\\[q = mc\\Delta T\\]</p>


<p>where q \\text q q is the heat energy transferred to or from the substance in Joules ( \\text J J ), m \\text m m is the mass of the substance in grams ( \\text g g ), c \\text c c is the specific heat capacity of the substance in Joules per gram per degree Celsius ( \\text J/g^\\circ\\text C J/gC) or Joules per gram per Kelvin ( \\text J/g\\text K J/gK ), and Δ T \\Delta T ΔT is the change in temperature of the substance in degrees Celsius ( ^\\circ\\text C C) or Kelvin ( \\text K K ).</p>


<p>This equation can be used to calculate any of the variables if we know the other three. For example, if we want to calculate the specific heat capacity of a substance, we can rearrange the equation as follows:</p>


<p>\\[c = \\fracqm\\Delta T\\]</p>


<p>This means that we need to measure or know the values of q \\text q q , m \\text m m and Δ T \\Delta T ΔT . To measure q \\text q q , we can use a device called a calorimeter that isolates the substance from its surroundings and measures how much heat energy it absorbs or releases when its temperature changes. To measure m \\text m m , we can use a balance that weighs the substance before and after heating or cooling. To measure Δ T \\Delta T ΔT , we can use a thermometer that records the initial and final temperatures of the substance.</p>


<h2>How to use specific heat capacity in different situations?</h2>


<p>Specific heat capacity can be used in different situations that involve heat energy transfer and temperature change. Here are some examples:</p>


<h3>Calculating heat energy transfer</h3>


<p>If we know the specific heat capacity of a substance, we can use the equation q = mcΔT to calculate how much heat energy is transferred to or from the substance when its temperature changes. For example, if we want to calculate how much heat energy is needed to raise the temperature of 100 g of water from 20 ^\\circ\\text C C to 80 ^\\circ\\text C C , we can use the following steps:</p>


<ol>


<li>Identify the given values and the unknown value. In this case, we are given m = 100 \\text g g , c = 4.18 \\text J/g^\\circ\\text C J/gC (from a table), T_i \\text T_i T_i = 20 ^\\circ\\text C C , T_f \\text T_f T_f = 80 ^\\circ\\text C C , and we want to find q \\text q q .</li>


<li>Write the equation and plug in the given values. In this case, we have: \\[q = mc\\Delta T = (100 \\text g)(4.18 \\text J/g^\\circ\\text C)(80 ^\\circ\\text C - 20 ^\\circ\\text C)\\]</li>


<li>Solve for the unknown value and include the units. In this case, we have: \\[q = (100 \\text g)(4.18 \\text J/g^\\circ\\text C)(60 ^\\circ\\text C) = 25080 \\text J\\]</li>


<li>Check your answer and make sure it makes sense. In this case, we can see that the answer is positive, which means that heat energy is transferred to the water (as expected). We can also see that the answer has the correct units of Joules.</li>


</ol>


<h3>Calculating temperature change</h3>


<p>If we know the specific heat capacity of a substance and the amount of heat energy transferred to or from it, we can use the equation q = mcΔT to calculate how much its temperature changes. For example, if we want to calculate how much the temperature of 50 g of iron decreases when it releases 500 J of heat energy, we can use the following steps:</p>


<ol>


<li>Identify the given values and the unknown value. In this case, we are given m = 50 \\text g g , c = 0.45 \\text J/g^\\circ\\text C J/gC (from a table), q = -500 \\text J J (negative because heat energy is released), and we want to find Δ T \\Delta T ΔT .</li>


<li>Write the equation and plug in the given values. In this case, we have: \\[-500 \\text J = (50 \\text g)(0.45 \\text J/g^\\circ\\text C)\\Delta T\\]</li>


<li>Solve for the unknown value and include the units. In this case, we have: \\[\\Delta T = \\frac-500 \\text J(50 \\text g)(0.45 \\text J/g^\\circ\\text C) = -22.22 ^\\circ\\text C\\]</li>


<li>Check your answer and make sure it makes sense. In this case, we can see that the answer is negative, which means that the temperature decreases (as expected). We can also see that the answer has the correct units of degrees Celsius.</li>


</ol>


<h2>What factors affect specific heat capacity?</h2>


<p>Specific heat capacity is not a constant value for a substance, but it depends on several factors such as temperature, pressure and purity. Here are some examples:</p>


<h3>Temperature</h3>


<p>The specific heat capacity of a substance usually changes with temperature. This is because the kinetic energy and the vibrational modes of the atoms or molecules in the substance change with temperature, which affects how much heat energy they can absorb or release. For example, the specific heat capacity of water increases slightly as the temperature increases from 0 ^\\circ\\text C C to 100 ^\\circ\\text C C . This means that it takes more heat energy to raise the temperature of water by one degree Celsius at higher temperatures than at lower temperatures .</p>


<h3>Pressure</h3>


<p>The specific heat capacity of a substance also changes with pressure. This is because the pressure affects the volume and the density of the substance, which affects how much heat energy it can store or release. For example, the specific heat capacity of air decreases as the pressure increases at constant temperature. This means that it takes less heat energy to raise the temperature of air by one degree Celsius at higher pressures than at lower pressures .</p>


<h3>Purity</h3>


<p>The specific heat capacity of a substance also depends on its purity. This is because impurities can affect the structure and the bonding of the substance, which affects how much heat energy it can absorb or release. For example, the specific heat capacity of pure water is 4.18 \\text J/g^\\circ\\text C J/gC , but the specific heat capacity of seawater is slightly lower because it contains dissolved salts and other substances .</p>


<h2>What common mistakes students make when solving specific heat capacity problems?</h2>


<p>Specific heat capacity problems can be tricky and confusing for some students. Here are some common mistakes that students make when solving them and how to avoid them:</p>


<h3>Mixing up units</h3>


<p>One of the most common mistakes that students make is mixing up the units of specific heat capacity, mass, temperature and heat energy. For example, some students might use grams instead of kilograms, or degrees Celsius instead of Kelvin, or calories instead of Joules. This can lead to incorrect answers and calculations. To avoid this mistake, you should always check the units of the given values and the unknown value, and make sure they are consistent and compatible. You should also use the appropriate conversion factors if you need to change the units.</p>


<h3>Using the wrong sign</h3>


<p>Another common mistake that students make is using the wrong sign for heat energy or temperature change. For example, some students might forget that heat energy is positive when it is transferred to the substance and negative when it is transferred from the substance. Or they might forget that temperature change is positive when the temperature increases and negative when it decreases. This can lead to incorrect answers and calculations. To avoid this mistake, you should always pay attention to the direction of heat energy transfer and temperature change, and use the correct sign accordingly.</p>


<h3>Using the wrong formula</h3>


<p>A third common mistake that students make is using the wrong formula for specific heat capacity problems. For example, some students might use the formula q = mcΔT for phase changes or chemical reactions, which are not valid situations for this formula. Or they might use the wrong value for specific heat capacity, such as using the value for water instead of iron. This can lead to incorrect answers and calculations. To avoid this mistake, you should always identify the type of problem and the substance involved, and use the appropriate formula and value for specific heat capacity.</p>


<h5>Conclusion</h5>


<p>In conclusion, specific heat capacity is a physical property that measures how much heat energy is needed to raise the temperature of one gram of a substance by one degree Celsius (or one Kelvin). It is important because it tells us how much heat energy a substance can store or release when its temperature changes. It can be found by using a table or an equation. It can be used in different situations that involve heat energy transfer and temperature change. However, it also depends on several factors such as temperature, pressure and purity. It can also be challenging and confusing to solve specific heat capacity problems. Therefore, you should be careful and avoid common mistakes such as mixing up units, using the wrong sign or using the wrong formula. By following these tips and strategies, you can learn how to solve specific heat capacity homework problems easily and confidently.</p> d282676c82


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