Insects from the genus Cimex known as bed bugs feast on blood, typically at night and skin rashes.
Thus, Their bites can have a variety of negative health repercussions, such as skin rashes, emotional effects, and allergy symptoms.
The effects of bed bug bites on the skin might range from little redness to obvious blisters. Itching is typically prevalent, and symptoms might take anywhere from minutes to days to manifest.
Some people might experience fatigue or a fever. Usually, impacted bodily parts are those that are exposed. There is no known contagious disease that their bites can spread.Vasculitis and regions of dead skin are unusual complications.
Thus, Insects from the genus Cimex known as bed bugs feast on blood, typically at night and skin rashes.
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How many atom and molecules of sulphur present in 64.0 g of sulphur
Answer:
1.2046*10^24 molecules
Answer:
1.506×1023 molecules
Explanation:
How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S8)? ∴ 64 g of sulphur will contain=6.022×1023×64256=1.506×1023 molecules.
•which energy source would be most economical
for the community to use?
OA. Hydroelectric
OB. Fossil fuels
OC. Nuclear
Hydroelectric energy source would be most economical for the community to use. The correct option is A.
Thus, the most cost-effective energy source for a town will often rely on a number of variables, including infrastructure, accessibility, and regional circumstances. However, hydroelectric electricity often has a better long-term cost-effectiveness and environmental impact.
Once the equipment is in place, hydroelectric power uses the energy of moving or falling water to produce electricity, making it a relatively cheap and renewable form of energy. Although fossil fuels may initially be less expensive, their supplies are limited, and they also contribute to pollution and climate change.
Thus, the ideal selection is option A.
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Which can be excluded from a list of objects in the solar system.
Constellation
Sun
Planet
Asteroid belt
Constellations can be excluded from a list of objects in the solar system.
The correct option is A.
What is the solar system?The solar system refers to the collection of celestial bodies that are gravitationally bound to the Sun. It consists of the Sun, the eight planets namely; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, their moons, asteroids, comets, and other smaller objects.
While constellations are formations of stars as observed from Earth, they are not physical objects within the solar system itself.
The Sun, planets, and the asteroid belt, on the other hand, are all components of the solar system.
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Place a test tube in the test tube rack, and label it 3. Then follow these steps using your prepared solution:
1. Use the pipette to remove copper(II) sulfate solution from the volumetric flask, and measure out 10 milliliters in the
graduated cylinder. Transfer the 10 milliliters of solution from the graduated cylinder to test tube 3.
2. Record the temperature of the solution in the table provided.
3. Measure 0.25 gram of zinc powder into a weighing boat.
4. Pour the zinc powder into test tube 3.
5. Measure the final temperature of the solution in test tube 3. Watch the thermometer for a couple of minutes, and
record the highest temperature it reaches.
6. Calculate and record the difference of the initial and final temperatures in the table.
B I y x² X, 10pt
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Measurement
Initial temperature (°C)
Final temperature (°C)
Temperature change (°C)
V
Answer
Based on the provided steps, we are conducting an experiment involving copper(II) sulfate solution and zinc powder. We are measuring the temperature change that occurs when zinc reacts with copper(II) sulfate.
Measurement:
Initial temperature (°C): This is the temperature of the copper(II) sulfate solution before adding zinc powder. Use a thermometer to measure and record this temperature.
Final temperature (°C): This is the highest temperature reached by the solution after adding the zinc powder and allowing the reaction to occur. Watch the thermometer for a couple of minutes and record the highest temperature observed.
Temperature change (°C): Calculate the difference between the initial and final temperatures. Subtract the initial temperature from the final temperature and record the result as the temperature change.
Follow the steps provided to carry out the experiment and record the corresponding measurements in the table. Make sure to use the pipette to transfer 10 milliliters of copper(II) sulfate solution to test tube 3, then add 0.25 grams of zinc powder to the test tube.
Monitor the temperature using a thermometer and record the initial and final temperatures accurately. Finally, calculate the temperature change by subtracting the initial temperature from the final temperature and record the value in the table.
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A population of plants has a mixture of individuals with short, wide flowers and long, narrow flowers. Short, wide flowers are more easily pollinated by bees while long, narrow flowers are more easily pollinated by hummingbirds. Over time, the population becomes dominated by long, narrow flowers.Which statement ,begin emphasis,best,end emphasis, explains the increase in number of plants with long, narrow flowers over time?Answer options with 4 options.The environment favors short, wide flowers instead of long, narrow flowers.B.The gene for short, wide flowers is mutated into a gene for long, narrow flowers.C.Individuals with long, narrow flowers are stronger than individuals with short, wide flowers.D.Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.
The best explanation for the increase in the number of plants with long, narrow flowers over time is option D: Individuals with long, narrow flowers produce more seeds than individuals with short, wide flowers.
In this population, short, wide flowers are better suited for bee pollination, while long, narrow flowers are more suitable for hummingbird pollination. Over time, the plants with long, narrow flowers produce more seeds compared to those with short, wide flowers.
This happens because the hummingbirds, which are the main pollinators for long, narrow flowers, are more effective in transferring pollen between these flowers. As a result, the long, narrow flower individuals have a higher reproductive success and pass on their traits to the next generation
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The thanksgiving luang cave system is estimated to be 35 million cubic meters large. An estimated 250 million liters of water was pumped out of the Dave over the course of the rescue if all the water had remained in the cave system instead of being pumped out what percent of the cave would have been filled with water?
If all the pumped water had remained in the cave system, approximately 71.43% of the cave would have been filled with water.
To calculate the percentage of the Thanksgiving Luang cave system that would have been filled with water if all the pumped water had remained, we need to find the ratio of the volume of water to the total volume of the cave system.Given that the cave system is estimated to be 35 million cubic meters large and 250 million liters of water were pumped out, we need to convert liters to cubic meters. Since 1 liter is equal to 0.001 cubic meters, the pumped water volume in cubic meters is 250 million multiplied by 0.001, which is 250,000 cubic meters.To find the percentage, we divide the volume of water (250,000 cubic meters) by the total volume of the cave system (35 million cubic meters) and multiply by 100.
Percentage = (Volume of water / Total volume of cave system) x 100
= (250,000 / 35,000,000) x 100
≈ 0.7143 x 100
≈ 71.43%
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For the reaction
4PH3(g)↽−−⇀6H2(g)+P4(g)
the equilibrium concentrations were found to be [PH3]=0.250 M, [H2]=0.580 M, and [P4]=0.750 M.
What is the equilibrium constant for this reaction?
c=
The equilibrium constant for the given reaction is approximately 25.199.
To determine the equilibrium constant for the given reaction, we can use the concentrations of the species at equilibrium. The equilibrium constant (Kc) is defined as the ratio of the product concentrations raised to their stoichiometric coefficients divided by the ratio of the reactant concentrations raised to their stoichiometric coefficients.
The balanced equation for the reaction is:
4PH3(g) ↔ 6H2(g) + P4(g)
Using the concentrations given at equilibrium, we can substitute the values into the equilibrium expression:
Kc = ([H2]^6 * [P4]) / ([PH3]^4)
Plugging in the given concentrations:
Kc = ([0.580 M]^6 * [0.750 M]) / ([0.250 M]^4)
Kc = (0.1311 * 0.750) / (0.00390625)
Kc ≈ 25.199
This value indicates that at equilibrium, the product concentrations are favored over the reactant concentrations, as Kc is greater than 1.
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For the reaction
2NH3(g)↽−−⇀ 3H2(g)+N2(g)
the equilibrium concentrations were found to be [NH3]=0.250 M, [H2]=0.470 M, and [N2]=0.800 M. What is the equilibrium constant for this reaction?
eq=
Rounding to the appropriate number of significant figures, the equilibrium constant (Kc) for the reaction is approximately 1.66.
To calculate the equilibrium constant (Kc) for the given reaction, we can use the formula:
Kc = ([H2]^3 * [N2]) / [NH3]^2
Plugging in the given equilibrium concentrations, we have:
Kc = (0.470^3 * 0.800) / (0.250^2)
Calculating the numerator:
(0.470^3 * 0.800) = 0.1037032
Calculating the denominator:
(0.250^2) = 0.0625
Now, dividing the numerator by the denominator:
Kc = 0.1037032 / 0.0625 = 1.6592512
The equilibrium constant represents the ratio of the concentrations of products to reactants at equilibrium. In this case, the equilibrium constant is greater than 1, indicating that the products (H2 and N2) are favored at equilibrium. This means that the forward reaction is favored, leading to the formation of more products compared to reactants.The equilibrium constant value of 1.66 suggests that the forward reaction is moderately favored at equilibrium, but without additional context, it is difficult to determine the extent of the reaction or the relative concentrations of reactants and products at the beginning of the reaction.
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Which of these pairings with create an octet for each atom?
A. One aluminum atom and one oxygen atom
B. One magnesium and one chlorine
C. One magnesium and one oxygen
D. One potassium and one sulfur atom
Answer:
C) one magnesium and one oxygen
How many grams of F are in 185g CaF2
There are 90.0 g of F are present in 185 g of CaF₂. In chemistry, a mole, usually spelled mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or other predetermined particles.
According to question, mass of CaF₂ = 185 g
It is required to calculate the moles of CaF₂
Moles of CaF₂ = 185 g / 78.074 g.mol-1
= 2.369 mole of CaF₂
Now find the moles of F from the moles of CaF₂
1 mole of CaF₂ = 2 moles of F
2.369 mole of CaF₂ = ?
= 4.74 moles of F
Now change the mole to gram of F
Mass of F = 4.74 moles of F × 18.998 g/mol
= 90.03 g of F
Thus, 90.0 g of F are in 185 g of CaF₂.
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Which gas has the higher boiling point and why? - Help!
Question 6 options:
Neon, because it has more protons.
Neon, because it has more electrons and has a stable filled octet.
Hydrogen, because it has a smaller size.
Hydrogen, because it has a lower molar mass.
Explanation:
4 th option is the correct oneYour Brainly Guide
What volume of CO2(g), measured at STP is produced if 15.2 grams of CaCO(s) is heated?
Answer:
Volume = 3.4 L
Explanation:
In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:
CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)
Now, let's calculate the number of moles in 15.2 g CaCO₃:
mole no. = [tex]\mathrm{\frac{mass}{molar \ mass}}[/tex]
= [tex]\frac{15.2}{40.1 + 12 + (16 \times 3)}[/tex]
= 0.1518 moles
From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.
Hence, from the formula for the number of moles of a gas, we can calculate the volume of CO₂:
mole no. = [tex]\mathrm{\frac{Volume \ in \ L}{22.4}}[/tex]
⇒ [tex]0.1518 = \mathrm{\frac{Volume}{22.4}}[/tex]
⇒ Volume = 0.1518 × 22.4
= 3.4 L
Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.
