CHEMISTRY COLLEGE

Which of the following changes is observed when we move across the row from left to right in the periodic table?

Answers

Answer 1

Answer:

Answer:

there is no picture to look at

Answer 2

Answer:

Answer:

Metallic character decreases as you move across a period in the periodic table from left to right. This occurs as atoms more readily accept electrons to fill a valence shell than lose them to remove the unfilled shell.

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a length of #8 copper wire (radius = 1.63 mm) has a mass of 24.0 kg and a resistance of 2.061 ohm per km. what is the overall resistance of the wire

Answers

m = pVol

p : copper density

Vol: volume

Vol = Al

A: area

L: length

m = p * A * L

L = m/p*A

To find the total resistance

Rtotal = R per Km * L/1000

Actually I think the question is missing the copper density.

What is the total mass (amu) of carbon in each of the following molecules?(a)CH4
(b)CHCL3
(c)C12H10O16
(d)CH3CH2CH2CH2CH3

Answers

The mass of carbon in $\rm CH_4$ is 12.007 amu, $\rm CHCl_3$ is 12.007, $\rm C_1_2H_1_0O_1_6$ is 144.084 amu, and $\rm CH_3CH_2CH_2CH_2CH_3$ is 60.035 amu.

What is the mass of one Carbon atom?

The mass has been given as the sum of the atomic mass unit in the compound. The mass of 1 atom of carbon is 12.007 amu.

The mass of carbon in the following compounds is given as:

$\rm CH_4$

The number of Carbon units = 1

The mass of carbon in compound = 12.007 amu

$\rm CHCl_3$

The number of Carbon units = 1

The mass of carbon in the compound = 12.007 amu

$\rm C_1_2H_1_0O_1_6$

The number of carbon units =12

The mass of carbon in the compound:

$\rm 12\;*\;12.007\;amu\n=144.084\;amu$

$\rm CH_3CH_2CH_2CH_2CH_3$

The number of carbon units = 5

The mass of carbon in the compound:

$\rm 5\;*\;12.007\;amu\n=60.035\;amu$

Learn more about the mass of an atom, here:

brainly.com/question/5566317

Answer:

The atomic mass of carbon (C) is 12.0107 amu, so if you want to calculate the total mass in each molecule, you just need to multiply the number of carbon atoms in the substance by 12.017. In (a) there is one atom of C, (b) have also one atom of C, (c) have 12 atoms of C, and (d) have five atoms of C. Thus, the total mass (amu) of carbon is:

(a) 12.017 amu

(b) 12.017 amu

(d) 60.085 amu

64.92 grams of Hg(NO3)2 to make 5.00 liters of solution.

Answers

Answer:

$\large\boxed{\large\boxed{0.0400mol/liter}}$

Explanation:

Knowing that you have 64.92 grams of Hg(NO₃)₂ to make 5.00 liters of solution, you can calcualte the molarity of the solution.

Molarity is a measure of concentration, defined as the number of moles of solute per liter of soluiton. Mathematically:

$Molarity=\frac{\text{number of moles of solute}}{\text{liters of solution}}$

Then, first you must calculate the number of moles of solute. The formula is:

$\text{number of moles}=\frac{\text{mass in grams}}{\text{molar mass}}$

You can either calculate the molar mass of the compound using the chemical formula or search it in the internet.

The molar mass of Hg(NO₃)₂ is found to be 324.7 g/mol.

Now you have everything to calculate the molarity of the solution:

$\text{number of moles}=(64.92g)/(324.7g/mol)=0.199977mol\approx 0.200mol$

$Molarity=(0.19977mol)/(5.00liters)\approx0.0400mol/liter$

What is the name of the structures that help move substances across a tract surface?

Answers

Answer:

cilia and flagella

Explanation:

In prokaryotic species , cilia are present , and in eukaryotic species , flagella is present .

Cilia and flagella both have same function , i.e. , to enable the movement of the cell , along with the movement of some substance and direct the flow of these substance along the tracts.

Cilia and flagella are composed of basal bodies.

Hence , from the given statement of the question,

The correct term is cilia and flagella .

Final answer:

Cilia are the structures that help move substances across the surface of a tract. They are primarily found in certain types of cells such as those in the respiratory tract and the oviducts.

Explanation:

The structures that assist in moving substances across a tract surface are primarily called cilia. In biology, cilia are tiny hair-like structures that line certain types of cells, especially those in the respiratory tract and the oviducts. They work much like oars on a boat, moving in coordinated waves to propel substances (like mucus or egg cells) along the surface of the tract they occupy. They are responsible in movement of substances across tract.

Learn more about Cilia here:

brainly.com/question/34223400

#SPJ3

An isotope contains 26 protons, 24 electrons, and 32 neutrons. What is the identity of the isotope

Answers

Answer:

58fe+2

Explanation:

26
protons equal identity

Why was plastic first invented? How is plastic bad for the environment?

Answers

Answer: The first plastic based on a synthetic polymer was invented in 1907. Plastic sticks around in the environment for ages, threatening wildlife and spreading toxins.

Not sure how it was invented but it had for the environment cause it causes plastic particles killing anything or endangering those that consume it.

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1.81 g H2 is allowed to react with 10.2 g N2, producing 2.19 g NH3.What is the theoretical yield in grams for this reaction under the given conditions?3H2(g)+N2(g)→2NH3(g)