I need question 8 plzzzz
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Answer:
3?
Explanation:
Answer:
B has 3 atoms
trust me have done problems like these
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The element carbon is present in all organic compounds. Which reason would explain why there are so many different types of organic compounds? A) Carbon is a nonmetal. B) Carbon has an atomic number of six. C) Carbon can form four covalent bonds. D) Carbon has a total of six electrons.
I REALLY NEED HELP WITH THIS CHEMESTRY PROJECT. I DO NOT UNDERSTAND ANYTHING OF THIS. CAN YOU GUYS PLZ HELP ME?Problem: You and your team work at Southern Nevada Water Authority and have been given the job of managing fluoride levels for the municipal water system. Today, you will need to measure the mass of the mineral sample fluorite (chemically, CaF2). Use this sample to determine how much water must be added to yield a 1 ppm fluoride solution. Your supervisor is requesting tanker trucks to bring the excess water. He needs to know how many tanker trucks to request and the total cost.Notes: 1 mol CaF2 = 78.08 g CaF2 = 6.02 x 1023 molecules of CaF21 molecules of CaF2 = 2 atoms of F1 mol H2O = 18 g H2O Density of water is 1 g/mL1000 mL = 1 L and 3.78 L = 1 gallonmass of sample of CaF2 = 287.185 g1 part per million = 1 atom of fluorine per 999,999 water molecules. 1 truck can carry 12,800 litters of water at a cost of $2,852.42 dollars.Before you begin mixing a solution of fluorite and water your team must first calculate the amount of water you will need. Your team will create a presentation that will show all of the necessary calculations to ensure that the greater Las Vegas area will have cavity free teeth. The presentation should include the following information:- Draw a diagram that points out the basic design of the water system and transport.- Demonstrate the following calculations (a) Calculate how many moles of mineral fluorite (CaF2) are in you sample. (b) Calculate the number of fluorine atoms in the sample of the mineral fluorite (CaF2). (b) Calculate how many molecules of water you will need. (c) Calculate the number of gallons of water that are needed to dissolve a 287.185 gram sample of fluorite to yield 1ppm solution.(e) How many trucks will be needed? Show your calculations!(f) what is will be the total cost?- Bonus points for creativity or “WOW” factor (i.e. pictures, color, neatness)!
Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?
Scientists test a hypothesis by?
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Can someone explain this one?
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Given:
Height of the mercury manometer, h = 23.6 cm
To determine:
The pressure of gas trapped in the closed-tube mercury manometer
Explanation:
In the case of a closed tube mercury manometer, the pressure of the gas is equal to the height difference of the mercury levels in the two arms of the manometer.
i.e. P(gas) = P(h)
in this case, h = 23.6 cm = 236 mm
i.e. Pgas = 236 mmHg
Since, 1 atm = 760 mmHg
The corresponding Pgas(atm) = 236 mmHg * 1 atm/760 mmHg = 0.311 atm
Ans: The pressure of the gas is 0.311 atm
Final answer:
The pressure of the gas in the closed-tube mercury manometer is approximately 0.31 atmospheres, calculated by converting the height of the mercury column into atmospheres.
Explanation:
The pressure of a gas in a closed-tube mercury manometer can be determined using the known height of the mercury and the concept of hydrostatic pressure. Firstly, it's important to note that the pressure on either side of the mercury column in the tube is equal. The pressure of the gas is the same as the hydrostatic pressure due to a column of mercury of the given height in the tube.
In the reference solution provided, the height is given as 26.4 cm. However, according to the question, the height is provided as 23.6 cm. Assuming the height is indeed 23.6 cm, we need to convert this to a pressure value. It is known that 1 atm at sea level is equivalent to a column of mercury that is about 760 mm high.
Therefore, we can convert the height of 23.6 cm or 236 mm into atmospheres. To do this, divide 236 mm by 760 mm to find the pressure in atmospheres. Therefore, the pressure of the gas in the manometer is approximately 0.31 atmospheres.
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It is endothermic and will have a positive enthalpy.
B)
It is endothermic and will have a negative enthalpy
C)
It is exothermic and will have a positive enthalpy.
D)
It is exothermic and will have a negative enthalpy.
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Answer is (D) - It is exothermic and will have a negative enthalpy.
If the reactants are at a higher potential energy compared to the products, it means reactants have more energy than the products. That energy is released to the environment as heat. Due to the releasing of heat to the surrounding, the reaction is exothermic. Since the reaction is exothermic; the enthalpy of the reaction will be negative value.
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Answer:
The answer is
2.0 g/mL
Explanation:
The density of a substance can be found by using the formula
From the question
mass = 10 g
volume = 5 mL
The density of the substance is
We have the final answer as
2.0 g/mL
Hope this helps you
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Answer:
1151.08miles/h
Explanation:
The given speed is 515 m/s
To convert meters per second to miles per hour:
Convert meters to miles: 1 m = 0.000621371 miles
Convert seconds to hours: 1 hr = 3600 s
Plug into the formula: miles/hr = (m/s) * (0.000621371 miles/m) * (3600 s/hr)
Plugging in the numbers: miles/hr = (515 m/s) * (0.000621371 miles/m) * (3600 s/hr) miles/hr = 1151.08miles/h
Therefore, the average speed of a nitrogen molecule in air at 25 °C converted to miles per hour is 1151.08miles/h.
Final answer:
To convert the average speed of a nitrogen molecule in air from meters per second to miles per hour, first convert the speed from meters per second to kilometers per hour, and then convert from kilometers per hour to miles per hour.
Explanation:
To convert the average speed of a nitrogen molecule in air from meters per second to miles per hour, we can use the conversion factor 1 mile = 1609.34 meters and 1 hour = 3600 seconds.
First, let's convert the speed from meters per second to kilometers per hour. We divide the speed in meters per second by 1000 to get the speed in kilometers per second and then multiply by 3600 to get the speed in kilometers per hour. This gives us a speed of approximately 1850 km/h.
Next, we convert the speed from kilometers per hour to miles per hour by dividing the speed in kilometers per hour by 1.60934. This gives us a speed of approximately 1150 mph.
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