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

Answers

Answer 1

Answer: 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 2

Answer:

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

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How many electrons can exist in the second shell surrounding an atomic nucleus?A. 1 or 2B. 1 to 8C. more than 8D. It depends on what the element is.
15 Which statement describes the particles of an ideal gas, based on the kinetic molecular theory?(1) The motion of the gas particles is orderly and circular.(2) The gas particles have no attractive forces between them.(3) The gas particles are larger than the distances separating them.(4) As the gas particles collide, the total energy of the system decreases.

Electrons always fill orbitals in the same order. Each s orbital holds 2 electrons, each set of p orbitals holds 6 electrons, each set of d orbitals holds 10 electrons, and each set of f orbitals holds 14 electrons. The order in which orbitals are filled, from first to last, is: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p

To what element does the following electron configuration correspond?

1s22s22p4

A. aluminum: 13 electrons
B. oxygen: 8 electrons
C. boron: 5 electrons

Answers

oxygen is the answer :)

Answer is B. oxygen with 8 electrons

What is the Celsius temperature of 1 mole of a gas that has an average kinetic energy of 3,866 joules?

Answers

Temperature can be calculated using the average kinetic energy. The ideal gas equation is being related to the average molecular kinetic energy.

PV = nRT
PV = (2/3) N(0.5mv^2)

By substituting and simplifying, we eventually get the equation.

KE = (3/2)RT
T = 3866 x 2 / 8.3145 x 3 = 309.98 K or 36.83 degrees Celsius

A student assisting with the experiment would observe all of the following about the electron transport chain EXCEPT:A. Electrons are passed from carriers with lower reduction potential to those with higher reduction potential.B. The first electron carrier is also a proton pump.C. All electron carriers are mobile and hydrophobic.D. The electron carriers can transport a maximum of 2 electrons.

Answers

Answer:

C. All electron carriers are mobile and hydrophobic

Explanation:

Hello,

In this case, it is widely known that the electron carriers move inside the inner mitochondrial membrane and consequently move electrons from one to another. In such a way, they are mobile, therefore they are largely hydrophobic as long as they are inside the membrane.

For instance, the cytochrome c is a water-soluble protein in a large range, therefore, the answer is: C. All electron carriers are mobile and hydrophobic.

Best regards.

What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? N2 + 3H2 --> 2NH3

Answers

Volume of hydrogen required to produce ammonia = 3*5 = 15L
since, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce ammonia.
Amount of ammonia produced = 2*5 = 10L as 1 mole of nitrogen produces 2 moles of ammonia

Acid rain can be destructive to both the natural environment and human-made structures. The equation below shows a reaction that occurs that may lead to the formation of acid rain.3NO2 + H2O 2HNO3 + NO

How many moles (precise to the nearest 0.01 mol) of nitric acid are produced from 300.00 mol of nitrogen dioxide?

200.00 mol
200.09 mol
450.00 mol
450.02 mol

Answers

Answer : The correct option is, 200.00 mole

Explanation : Given,

Moles of nitrogen dioxide = 300.00 mole

The balanced chemical reaction will be,

$3NO_2+H_2O\rightarrow 2HNO_3+NO$

From the balanced chemical reaction, we conclude that 3 moles of nitrogen dioxide react with 1 mole of water to give 2 moles of nitric acid and 1 mole of nitric oxide as a product.

As, 3 moles of nitrogen dioxide react to give 2 moles of nitric acid

So, 300.00 moles of nitrogen dioxide react to give $(2)/(3)* 300.00=200.00$ moles of nitric acid

Therefore, the number of moles of nitric acid is, 200.00 moles

Balanced chemical equation

3 NO2 + H2O = 2 HNO3 + NO

3 mol NO2 --------> 2 mol HNO3
300.00 NO2 --------> x mol HNO3

3 * x = 300.00 * 2

3 x = 600.00

x = 600.00 / 3

x = 200.00 mol

hope this helps!.

Scientists think the earth is approximately _____ years old.2 billion
3 billion
4 ½ billion
6 ½ billion

Answers

Answer is 4 ½ billion.

Scientists think the earth's age is 4 ½ billion. This calculation is based on the radioactive dating. Since the formation of the earth, the time period has been divided into 3 major geological time periods as eon. They are phanerozoic, proterozoic and archean.

Final answer:

Scientists estimate that the Earth is approximately 4.5 billion years old based on radiometric dating and other lines of evidence.

Explanation:

The correct answer is 4 ½ billion years. Scientists believe that the Earth is approximately 4.5 billion years old based on evidence from radiometric dating of rocks on Earth and meteorites. Radioactive elements such as uranium and potassium decay into stable isotopes over time, and by measuring the ratio of parent isotopes to daughter isotopes in rocks, scientists can estimate the age of the Earth.

This estimation is supported by other lines of evidence, such as the age of the oldest rocks on Earth and the Moon, and the ages of meteorites. These findings suggest that the Earth formed shortly after the formation of the Solar System, which is estimated to be about 4.6 billion years old.

Therefore, the most accurate estimation is that the Earth is approximately 4.5 billion years old.

Learn more about Age of the Earth here:

brainly.com/question/33600049

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