The answer is suppose to be B but I don’t understand why not D

Answers

Answer 1

Answer: Maybe something’s Nessus up

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Determine the gram formula mass of the product

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For the whole set of problems, always remember the Avogadro’s number is 6.023*10^23 units per mole of a substance. Units could be atoms, molecules or formula units.

The first question asks for the number of molecules of NaNO3. The molar mass of NaNO3 is 85 grams per mole. So,

150g NaNO3(1mole NaNO3/85 grams NaNO3)(6.023*10^23 molecules/1mole NaNO3)=1.063*10^24 molecules of NaNO3

5.7*10^46 molecules of NaNO3(1mole NaNO3/6.023*10^23 molecules)(85 grams NaNO3/1mole NaNO3) = 8.044*10^24 grams NaNO3

For the molar mass of water, we have 18.02grams per mole.

301 moles H2O(18.02 grams H2O/1 mole H2O) = 5424.02 grams H2O

For the molar mass of sulfuric acid, we have 98.08 grams per mole.

25g H2SO4(I mole H2SO4/98.08g H2SO4) = 0.2549 mole H2SO4

For the molar mass of Ca(OH)2, we have 74.1 grams per mole.

252gCa(OH)2(1mol/74.1g)(6.023*10^23/1mol) = 2.048*10^24 molecules of Ca(OH)2

For the molar mass of calcium, we have 40 grams of Ca per mole.

6.7*10^35 atoms Ca(1 mole Ca/6.023*10^23 atoms)(40g Ca/1mol Ca) = 4.45*10^13 grams Ca

Mindy and her lab partner conducted flame tests of several metallic salt solutions. They dipped a wire loop into each salt solution, and one by one, heated the sample in the Bunsen burner flame. Based on their results, which element produced a colored light with the lowest energy?A) barium
B) calcium
C) copper
D) potassium

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Flame tests of metals produce various colors. The colors produced by each of the choices are:

A. barium - pale green
B. calcium - yellow red
c. copper - green blue
d. potassium - lilac

Using the visible light spectrum, it can be determined that the metal with the lowest energy is B. calcium. This is because the color yellow-red is near the end of the spectrum with the longest wavelength. Since wavelength is inversely proportional to energy, calcium has the lowest energy.

Answer:

Explanation:

The color of the emitted light depends on the energy. According to the arrangement of the electromagnetic spectrum, the color red has the lowest energy, the lowest frequency, and the largest wavelength

State one conclusion from Rutherford experiment that contradicted one conclusion made by Thompson

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One conclusion from Rutherford's experiment that greatly contradicted Thompson's experiment is that 'atoms are mostly empty space, with positively charged nucleus'. While Thompson concluded that there are negatively charged particles as part of the internal structure of the atoms.

Answer:

One conclusion from Rutherford's experiment that greatly contradicted Thompson's experiment is that 'atoms are mostly empty space, with positively charged nucleus'.

Explanation:

How many grams of sodium chloride are present in a 0.75 M solution with a volume of 500.0 milliliters?

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The units for molarity is moles of solute per liter of solution which means if you multiply the molarity of a solution by its volume you get how many moles of solute are in the solution. (0.75Mx0.5L=0.375mol NaCl) Then you can multiply the moles of sodium chloride (0.375 mol) by its molar mass (58.45 g/mol) to get 21.92g of sodium chloride. That means there is 21.92 grams of sodium chloride in 500mL of 0.75M solution. I hope this helps. Let me know if anything is unclear.

According to the Arrhenius Theory a base reacts with an acid to produce

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Water. Arrhenius acids provide a H+ ion and a base provides a OH- ion, which react to form water.

When a neutral atom undergoes oxidation, the atom’s oxidation state(1) decreases as it gains electrons(2) decreases as it loses electrons(3) increases as it gains electrons(4) increases as it loses electrons

Answers

When a neutral atom undergoes oxidation, the atom's oxidation state increases at it lose electrons.

The acronym "OILRIG" can be used to remember this: Oxidation is Losing electrons, Reduction is Gaining electrons. Therefore, when an atom undergoes oxidation, it loses electrons. This makes its net charge more positive, so its oxidation state increases.
This best fits choice (4).

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The table below gives information about the nucleus of each 4 atoms Atom Number of protons Number of neutrons A 6 6 D 6 7 G 7 7 E 7 8 How many different elements are represented by the nuclei in the table? A 1 B 2 C 3 D 4

Describe the motion of a ball being thrown straight up in the air in terms of kinetic and potential energy. as the ball rises up and falls back down, how is its kinectic and potential energy affected?

a cylinder with a moveable piston contains 0.553 mol of gas and has a volume of 253 ml. what is its volume if has 0.365 mol of gas in the cylinder. (assume constant temperature and pressure.)