Question 10 of 25
Which scenario is the best example of matter absorbing energy from a wave?
A. Sound changing pitch as a musician plays an instrument
B. A conversation heard clearly from another room
C. Ice melting when exposed to direct sunlight
D. Light that can be seen through a glass window

To calculate the percentage of your sample lost during recrystallization, you need to know the mass of the lost material relative to the initial sample mass.

Let's assume you started with a known mass of aspirin before the recrystallization process. Let's denote this initial mass as "m_initial" (in mg). After the recrystallization process, you have a reduced mass of aspirin, denoted as "m_final" (in mg).Finally, to calculate the percentage of the sample lost, you divide the mass lost by the initial mass and multiply by 100 Percentage lost = (Mass lost / m_initial) * 100 By plugging in the values for "m_initial," "m_final," and performing the calculations, you can determine the amount of money lost through the recrystallization process.

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Answer:

702

Explanation:

52 slice of bread/2 slices of bread is 26, 81 slice of cheese/3 slices of cheese is 27, 26x27 is 702!

Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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Answer: ferrous salts

Explanation:

done

Based on the change in pressure, we can conclude that the combustion reaction taking place in the container is likely to involve the production of gases that increase the pressure in the container by 1.7 atm.

Based on the given information, we can use the ideal gas law to determine the combustion reaction taking place in the container. The ideal gas law is given by the equation:

PV = nRT

where P is pressure, V is volume, n is the number of moles of gas, R is the ideal gas constant, and T is temperature.

Since the container is sealed and the volume is constant, we can assume that the number of moles of gas (n) and the volume (V) remain constant throughout the combustion reaction. Therefore, we can compare the initial and final pressures (P1 and P2) at the same temperature (T) to determine the change in pressure (ΔP) caused by the combustion reaction.

Initial pressure (P1) = 10.0 atm

Final pressure (P2) = 11.7 atm

Temperature (T) = 400 K

ΔP = Final Pressure - Initial Pressure
ΔP = 11.7 atm - 10.0 atm
ΔP = 1.7 atm

Since the pressure increased by 1.7 atm and the container has a constant volume, this indicates that there is an increase in the number of moles of gas in the reaction. Without specific reactant information, it is not possible to determine the exact combustion reaction taking place in the container.

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Frozen RBCs prepared using glycerol  (40%) technology can be stored for up to 10 years at -65 °C or lower.

Frozen Red Blood Cell:

These are red blood cells that have been biochemically modified to restore or improve their oxygen transport function prior to freezing in 40% glycerol (w/v). These frozen red blood cells were stored in a mechanical freezer at -60 °C for at least 14 years with satisfactory results.

Of the options listed, the correct temperature for storing red blood cells produced by the high-glycerol preservation method is below 0°C. At this temperature, the glycerol solution slows cellular metabolism, maintaining the viability and function of red blood cells for a long period of time. Red blood cells stored below 65°C can damage the cells and make them unsuitable for transfusion. Similarly, storage below 20 °C may allow for short-term preservation, but is not suitable for long-term storage as RBC viability can be greatly reduced. Storage of RBCs at 10 °C or lower may allow for short-term preservation, but may not be suitable for long-term storage as low temperatures may freeze the cells and cause irreversible damage.

Erythrocytes can be frozen in a glycerol solution and stored for several years. Thawed red blood cells must be freed of glycerol, but regenerated cells have normal survival rates in humans. Freezing has been used to store red blood cells of rare phenotypes for over 40 years. These attempts have largely been abandoned due to freezing, storage and handling costs, better management of larger and longer-lived RBC stocks, and concerns about the safety and waste of stored RBCs that do not pass state-of-the-art tests. . It is related to the short shelf life of thawed red blood cells.

A new automated system for handling frozen red blood cells has the potential to extend the shelf life of frozen red blood cells by up to two weeks, but without significantly impacting the cost or waste associated with using frozen red blood cells. Frozen red blood cells have little impact on blood supply logistics.

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The volume of the solution is obtained as 124mL.

We know that this problem has to do with the stoichiometry of the reaction. In this case, we have the reaction that is occurring between the potassium iodide solution and the  copper II nitrate solution.

First of all let us look at the balanced reaction equation which is written as;

2 Cu(NO₃)₂(aq) + 4 KI(aq) → 2 CuI(aq) + I₂(s) + 4 KNO₃(aq)

Number of moles of the  Cu(NO₃)₂ reacted = 2.43 g/188 g/mol = 0.013 moles

If 2 moles of Cu(NO₃)₂ would have to react with 4 moles of KI

0.013 moles moles of Cu(NO₃)₂ would have to react with 0.013 * 4/2

= 0.026 moles

Given that;

Number of moles = concentration * volume

Concentration of  KI  = 0.209 M

Volume =Number of moles /Concentration

= 0.026 moles/0.209 M

= 0.124 L or 124mL

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0.056 mol of H₂ gas occupies a volume of 1.26 L at 25°C and 1.11 atm pressure. To solve this problem we make use of the expression of ideal gas law equation.

The ideal gas law is an equation that relates the pressure, volume, temperature, and number of moles of an ideal gas. It is expressed mathematically as:

PV = nRT

where P = pressure,

V = volume,

n = the number of moles,

R = 0.0821 L·atm/mol·K, and

T = the temperature in Kelvin.

First, we need to convert the temperature of 25°C to Kelvin:

T = 25°C + 273.15 = 298.15 K

From ideal gas law:

(1.11 atm) V = (0.056 mol) (0.0821 L·atm/mol·K) (298.15 K)

Simplifying the equation, we get:

V = (0.056 mol) (0.0821 L·atm/mol·K) (298.15 K) / (1.11 atm)

V = 1.26 L

Therefore, 0.056 mol of H₂ gas occupies a volume of 1.26 L at 25°C and 1.11 atm pressure.

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Answer:

When a boy smells the aroma coming from the pot on the stove is actually detecting the chemicals coming from the air which comes from hot food that dissolves in the mucus present in the nasal cavity that carries tiny hairs made up of the nerve fibers that absorb these chemicals and excite or stimulate the olfactory receptors.

Various types of a distinct aroma or smell lead to a specific combination of the olfactory cells to make a specific smell. These combination patterns transported to the olfactory bulb along axons; a long extended neuron.

The sensory patterns or information encoding the smell of food present in the pot reaches the primary olfactory cortex in the brain, which is present on the anterior surface of the temporal lobe, and decodes accordingly.

Answer:You breath in what you smell and if it smells good or not you usely get up an see what is in the kitchen

Explanation:

Answer:

-1

Explanation:

since 0.0094×10^2 = 100*0.0094 = 0.94 = 9.4*10^-1.

10^-1 = 0.1

0.1 * 9.4 = 0.94

\(9.4\times10^?\) can be expressed as \(9.4 \times 10^{-1\) in scientific notation. Therefore the missing exponent is -1.

To express \(0.0094\times10^2\) in scientific notation, we move the decimal point two places to the right, resulting in 9.4. The exponent remains the same, so the scientific notation is \(9.4\times10^2\).

To determine the missing exponent for \(9.4\times10^?\) we count the number of decimal places needed to shift the decimal point to the right of the first nonzero digit, which in this case is 9.4. In this case, we need to move the decimal point one place to the left to obtain 9.4. Therefore, the missing exponent is -1.

So, \(9.4\times10^?\) can be expressed as \(9.4\times10^{-1\) in scientific notation.

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Answer: meter per second

Explanation: speed = distance / time, in SI units m/s

Answer:

Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide.

Explanation:

Answer:

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.

Explanation:

During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds. Photosynthesis provides us with most of the oxygen we need in order to breathe. We, in turn, exhale the carbon dioxide needed by plants. Plants are also crucial to human life because we rely on them as a source of food for ourselves and for the animals that we eat.

I hope this helps all of you!

Answer:

As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 80∘C

Explanation:

HOPE THIS HELPS !

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass of air = 1.2 g

volume = 4,555 mL

Substitute the values into the above formula and solve for the density

That's

= 0.0002634

We have the final answer as

Hope this helps you

The composition, in weight percent, of the alloy is therefore 94.6% Ag and 5.4% Cu.

To calculate the composition in weight percent of an alloy that consists of 94.1 at% Ag and 5.9 at% Cu, we need to follow the steps below:

1: Calculate the molar fraction of Ag

Molar fraction of Ag = % of Ag in the alloy / atomic weight of Ag

Molar fraction of Ag = 94.1 / 107.87 = 0.8715

2: Calculate the molar fraction of Cu

Molar fraction of Cu = % of Cu in the alloy / atomic weight of Cu

Molar fraction of Cu = 5.9 / 63.55 = 0.0929

3: Calculate the total molar mass of the alloy by using the molar fractions

Total molar mass of the alloy = (molar fraction of Ag × atomic weight of Ag) + (molar fraction of Cu × atomic weight of Cu)

Total molar mass of the alloy = (0.8715 × 107.87) + (0.0929 × 63.55) = 99.49 g/mol

4: Calculate the weight fraction of each element

Weight fraction of Ag = (molar fraction of Ag × atomic weight of Ag) / total molar mass of the alloy

Weight fraction of Ag = (0.8715 × 107.87) / 99.49 = 0.946

Weight fraction of Cu = (molar fraction of Cu × atomic weight of Cu) / total molar mass of the alloy

Weight fraction of Cu = (0.0929 × 63.55) / 99.49 = 0.054

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An interaction of carbonyl groups lining the wall of the pore with the Un solvated K+ ion happens, that balances the energy required to remove the hydration shell.

Carbonyl groups lining the wall of the pore can interact with the Un solvated K+ ion, balancing the energy required to remove the hydration shell.

K+ channel uses the energy in ATP hydrolysis to take off the hydration shell from the K +ion.

One of these bonds breaks in a hydrolysis process and releases a fairly large amount of energy.

The following reaction takes place in the hydrolysis of ATP to ADP:

ATP + H₂O ⇋ ADP + Pi + Energy

Like the majority of chemical processes, the hydrolysis of ATP to ADP is reversible.

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The atomic radius increases as you go down a group/family due to the increasing number of energy levels. On the other hand, as you go across a period/row, the atomic radius decreases due to the increasing number of protons in the nucleus.

1. As you go down a group/family on the periodic table, the atomic radius generally increases.

2. This trend is caused by the increasing number of energy levels as you go down the periodic table. As the number of energy levels increases, the distance between the nucleus and the outermost energy level also increases, leading to an increase in the atomic radius.

3. As you go across a period/row on the periodic table, the atomic radius generally decreases.

4. This trend is caused by the increasing number of protons in the nucleus as you go across the periodic table. The increased positive charge of the nucleus causes the electrons to be attracted more strongly to the nucleus, leading to a decrease in the size of the atom.

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Answer:

solid

Explanation:

gold is relatively unreactive and exists as a solid at room temperature

It is found as a solid in gold mines, and in gold nuggets in river beds

Answer:

This collision makes the electron in the cathode free. These electrons undergo collision with neutral atoms of the gas and ionize them to form ions. The positive ions thus produced move toward the oppositely charged cathode and electrons move towards the anode

Answer:

1.875 dm^3

Explanation:

M = moles of solute ÷ volume of solution

M =11.25 x 6

  = 1.875 dm^3

2L is the correct answer .

HOW TO CALCULATE ??

                      Molarity (M)            = 6

     On puting values and solving we get , V = 1.875 L ≈ 2L

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The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

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Answer:

\(total \: volume = 71 + 127 \\ = 198 \: ml \\ \% \: coffee = \frac{71}{198} \times 100\% \\ = 35.86\%\)

The term that describes what she is measuring is called partial pressure.

From the Dalton's law of partial pressure, the total pressure of a gas is regarded as the sum of the partial pressures of all the gases in the mixture.

As such, each of the gases; carbon dioxide, oxygen, and nitrogen all possess partial pressures thus the term that describes what she is measuring is called partial pressure.

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The empirical formula of the compound is C₅H₁₂O₁₂, and the molecular formula of this compound is C₈H₁₈O₁₈.

To determine the empirical formula, we need to determine the moles of each element present in the compound. From the data given, we know that complete combustion of 0.150g of the compound produces 0.225g of CO₂ and 0.0614g of H₂O. We know that CO₂ is composed of one carbon atom and two oxygen atoms, and H₂O is composed of two hydrogen atoms and one oxygen atom. Therefore,

the moles of carbon present is 0.225g / (12.01 + 2(16.00)) = 0.0125 moles.

The moles of hydrogen present is 0.0614g / (2(1.008)) = 0.03 moles.

The moles of oxygen present is 0.225g / 16.00 + 0.0614g / 16.00 = 0.03 moles.

The ratio of these moles is C:H:O = 0.0125:0.03:0.03

To simplify this ratio we divide each number by the smallest number:

C:H:O = 5:12:12

So, the empirical formula of the compound is C₅H₁₂O₁₂

To find the molecular formula, we know that the molecular weight of the compound is 264 g/mol. Since the empirical formula weight of the compound is (512.01) + (121.008) + (12×16.00) = 180.24 g/mol. To find the ratio of the molecular weight to the empirical formula weight, we divide 264 by 180.24, which is approximately 1.47. Therefore, the molecular formula of the compound is:

C₅H₁₂O₁₂ × (1.47)¹ = \(C_{7.4}\)\(H_{17.4\)\(O_{17.4}\) which can be simplified to C₈H₁₈O₁₈.

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A three-compartment sink is typically used to wash dishes and utensils in restaurants and other foodservice establishments. The sink has three separate compartments: one for washing, one for rinsing, and one for sanitizing. Each compartment requires a specific temperature for the water to be effective in cleaning and sanitizing dishes.

What temperature should water be in a 3 compartment sink? The temperature of the water in each compartment of a three-compartment sink should be as follows:

Washing: The water temperature for the washing compartment should be between 110°F and 120°F.

Rinsing: The water temperature for the rinsing compartment should be between 110°F and 120°F.

Sanitizing: The water temperature for the sanitizing compartment should be between 170°F and 180°F.The washing and rinsing compartments should be filled with detergent and water.

The sanitizing compartment should be filled with water and a sanitizing agent, such as bleach or a quaternary ammonia solution. The temperature of the water in the sanitizing compartment is important because it helps to kill any bacteria or viruses that may be present on the dishes or utensils. Overall, it is essential to maintain proper water temperatures in a three-compartment sink to ensure that dishes are properly cleaned and sanitized.

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Le Chatelier's principle states that if a change is made to a system at equilibrium, the system will respond in a way that opposes the change and works to reestablish equilibrium.

This means that if a change is made to the concentration, pressure, or temperature of a system in equilibrium, the equilibrium will shift to compensate for the change.

In the given reaction: N2O4(g) + energy ⇄ 2NO2(g)

An increase in pressure will cause the equilibrium to shift towards the side with fewer gas molecules, which in this case is the reverse reaction (N2O4). This will result in a decrease in the number of gas molecules in the system.

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Answer:

true

Explanation:

Covalent bonds are formed through the overlap of half-filled valence orbitals. Because of the overlapping, it is most probable that electrons are located within the region of the bond.

In order to make a covalent bond, the orbitals on each atom in the bond must overlap. Therefore, the given statement is true.

A covalent bond is an electron exchange usually results in the production of electron pairs between atoms. These electron couples are referred to as bonding pairs as well as sharing pairs. Covalent bonding seems to be the permanent equilibrium of atoms' forces of attraction versus attraction when atoms share electrons.

Because to electron sharing, each atom in a number of molecules can achieve the corresponding amount of the valence shell, resulting inside a stable electronic configuration. In organic chemistry, covalent bonds are far more common than ionic ones. In order to make a covalent bond, the orbitals on each atom in the bond must overlap.

Therefore, the given statement is true.

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