Which force holds the nucleus of an atom together?A. Strong nuclear force
B. Weak nuclear force
C. Electrostatic force
D. Gravity

Answers

Answer 1

Answer:

Answer:

Strong nuclear force

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Biotechnology can be both useful and potentially destructive. Choose one example of biotechnology and identify whether it has had a positive or negative effect on society. Explain your answer.

Answers

I am not going to give you a full research report, but one example is DNA fingerprinting via gel electrophoresis. This has definitely had a positive effect on society, as it makes forensics a much more certain and just process. Gel electrophoresis can be used to separate and arrange DNA strands in order of length. You can then compare this arrangement to determine whether or not it matches another DNA arrangement. It has a very high accuracy rating, so you can be almost certain that if you have two electrophoresis results that look identical, that both DNA samples belong to the same person. This is compelling evidence that can either acquit or condemn suspects with certainty.

Which list includes elements with the most similar chemical properties? 1.Br, Ga, Hg 2. Cr, Pb, Xe 3. O, S, Se 4. N, O, F

Answers

The list which includes elements with the most similar chemical properties is; Choice 3: O, S, Se

First, we must know:

Elements are arranged in 7 Periods and 18 groups in the periodic table.

Additionally, Elements in the same group of the periodic table often have similar chemical characteristics as a result of equal number of Valence electrons.

By considering Choices individually;

For Choice 1: (Br, Ga and Hg)

Bromine is a member of Group 17, Gallium is a member of Group 13 and Mercury is a member of Group 12.

Bromine is a member of Group 17, Gallium is a member of Group 13 and Mercury is a member of Group 12.All three elements belong to different groups. In essence, they do not show similar chemical properties.

For Choice 2: (Cr, Pb and Xe)

The elements belong to different groups of the periodic table and consequently, they do not show similar chemical properties.

For Choice 3: (O, S and Se)

Oxygen, Sulfur and Selenium are all members of Group 16(6)

Since, all three elements belong to same group. In essence, they will show similar chemical properties.

For choice 4: (N, O and F)

The elements belong to different groups of the periodic table and consequently, they do not show similar chemical properties.

Ultimately, the correct answer is Choice 3.

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Answer: The correct answer is Option 3.

Explanation:

Elements are distributed in 7 Periods and 18 groups in a periodic table.

Elements which belong to same group show similar chemical properties because of the same number of valence electrons.

For the given options:

Option 1: Br, Ga and Hg

Bromine is present in Group 17, Gallium is present in 13 and Mercury is present in Group 12.

As, all the three elements belong to different groups. So, they do not show similar chemical properties.

Option 2: Cr, Pb and Xe

Chromium is present in Group 6, Lead is present in Group 14 and Xenon is present in Group 18.

As, all the three elements belong to different groups. So, they do not show similar chemical properties.

Option 3: O, S and Se

Oxygen, Sulfur and Selenium are present in Group 16.

As, all the three elements belong to same group. So, they will show similar chemical properties.

Option 4: N, O and F

Nitrogen is present in Group 15, Oxygen is present in Group 16 and Fluorine is preset in Group 17.

As, all the three elements belong to different groups. So, they do not show similar chemical properties.

Hence, the correct answer is Option 3.

In the important industrial process for producing ammonia (the Haber Process), the overall reaction is:N2(g) + 3H2(g) 2NH3(g) + 100.4 kJ
A yield of NH3 of approximately 98% can be obtained at 200°C and 1,000 atmospheres of pressure.
How many grams of Ny must react to form 1.7 grams of ammonia, NH3?
0.052 g
1.49
0.00589
2.8 g

Answers

Answer:

Explanation:

Here we have to use stoichiometry.

First of all, we have to calculate the mass of 100% of yield:

1.7 g ------- 98%

X -------- 100%

X = 1.73 g (approximately)

Second, we have to calculate the mass of N2 that is necessary to react to produce the mass of 1.73g of NH3. To do that, we have to use the Molar mass of N2 and NH3 and don't forget the stoichiometric relationship between them.

Molar Mass N2 : 14x2 = 28 g/mol

Molar Mass NH3: 14 + 3 = 17 g/mol

28g (N2) ------- 17x2 (NH3)

X ------------ 1.73 g

X = 1.42 g (approximately)

Which statement explains how the bands in the crystal of a metal are like atomic orbitals?

Answers

Please provide the choices here.

The similarity of the bands in the crystal of a metal to the atomic orbitals can be explained by the band theory of metals. In an atom, when the electrons get excited, the electrons jumps to a higher orbital so as to reach equilibrium. This is analogous to the electrons in the metals which also jumps to another band once excited by an external energy (e.g. electrical energy).

Answer:

Explanation:

They both allow electrons to move from lower energy levels to higher energy levels.

What is the percentage of water to the nearest tenth in this compound? Ba(OH)2 * 8H2O

Answers

mass of water: 8 * 18 g = 144 g
mass of Ba(OH)2 = 171.3 g

total mass: 144 g + 171.3 g = 315.3 g

percentage of water: (144 g / 315.3 g) * 100% = 45.67%

Give the number of valence electrons for each of the following: Ba, Al, P, Se, Br, K