a rigid metal container has a volume of 20.0 L with nitrogen gas to a pressure of 197atm at 28.0 C. How many moles of gas are present in the container

Answer:

graphite

Explanation:

graphite is also good conductor of electricity

Answer:

15.547437000000029

Explanation:

Answer:

C) Bromine is produced

Explanation:

When iodine chemically reacts with potassium bromide then it will lead to the formation of potassium iodide and bromine. This reaction is actually a single displacement reaction in which bromine from potassium bromide is displaced by iodine atom.

When iodine solution is added to potassium bromide solution ,bromine is produced. It is an example of displacement reaction.

Displacement reactions are chemical reactions in which one element present in a compound is replaced by another element.The reaction generally takes place between a molecule and a compound.

During the reaction, the anion of compound is replaced by the molecule and the anion of the compound is transformed into a molecule.When iodine molecule in form of solution is reacted with solution of potassium bromide solution of potassium iodide is obtained.

During this reaction anion of potassium bromide that is bromine is replaced by iodine forming solution of potassium iodide and molecule of bromine is liberated in the form of gas.

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Answer: 2!

Explanation:

The best lewis structure for [tex]Cl_2[/tex] is in option 2.

Na or sodium is the cation in the reactant.

Cl or chlorine is the anion in the reactant side.

NaCl is the product of the reaction.

Lewis Structure is a very simplified representation of the valence shell electrons in a molecule.  It is used to show how the electrons are arranged around individual atoms in a molecule.  Electrons are shown as "dots" or for bonding electrons as a line between the two atoms.

Chlorine is a group VIIA element in the periodic table and contains seven electrons in its last shell.  

Valence electrons are given by chlorine atoms = [tex]7\times2=14[/tex]

Total valence electrons = 14

So, each of Cl is surrounded by three pairs of dots, connected by a single line. So, the best lewis structure for [tex]Cl_2[/tex] is in option 2.

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Answer:

C) Orion spur.

The Orion Arm is a minor spiral arm of the Milky Way Galaxy that is 3,500 light-years across and approximately 10,000 light-years in length, containing the Solar System, including Earth.

Answer:

yes

Explanation:

Na2CO3 + H2SO4 --> Na2SO4 + H2O + CO2

Answer: Electrons have wavelike motion and are restricted to certain energy states associated with specific wavelengths.

Answer:

Adding more CO2 to the atmosphere will cause surface temperatures to continue to increase. However, more energy is absorbed in the weaker bands and in the wings of the strong band, causing the surface and lower atmosphere to warm further.

Answer:

it have more more mass, gravitational potential energy

Explanation:

Answer: 31! hope this helps!

Explanation:

Answer:

Explanation:

You can't award 20 points once you have awarded 5.

One

2K + Cl2 ==> 2KCl

It's True

There are 2 Ks and Cl2 has 2 atoms making up on the left.

On the right, 1 molecule of KCl has 1 Potassium and 1 Cl. But there are 2 molecules so between the two of them, there's 2 Potassiums and 2 Cl

Two

The reactant side is the Left side. Cl2 means there are 2 Cl atoms making Cl2. Answer B

Three

False: There are 2 but read below.

I really don't know how to answer that. It's not qualified enough. There are a total of 2 Chlorines on the right hand side when there are 2 molecules. I think you are intended to answer False, but don't be surprised if you get it wrong.

Answer:

Aquatic plants have aur filled tissues to make them easy to float.....

Explanation:

It provides buoyancy

Answer:

Very toxic materials are substances that may cause significant harm or even death to an individual if even very small amounts enter the body.There are a number of very toxic materials that may be used in workplaces. Some examples include carbon monoxide, hydrogen sulfide, chlorine and sodium cyanide

Explanation:

here are generally four types of toxic entities; chemical, biological, physical and radiation: Chemical toxicants include inorganic substances such as, lead, mercury, hydrofluoric acid, and chlorine gas, and organic compounds such as methyl alcohol, most medications, and toxins.

The highly toxic chemical compounds can be changed to less toxic one by suitable substitution reactions where, a functional group which less hazardous but having the same biochemical properties are substituted for the new product.

Toxicity of a chemical is its ability to cause serious health risks which can strike a single cell. Exposure to toxic chemicals may even lead to death. The dose of toxicity depends on the structure and reactivity of the chemicals.

Also the adverse effect of each toxic chemicals depends on the way of exposure, and the amount of exposed chemical. There are some methods to detoxify a living body if any toxic is intaken. Suitable antidotes are given for them.

The toxicity generated in a chemical might be originated from a certain structure or group. Thus, by altering  that group for instance substituting a ring or removing them ir substituting a functional group that is responsible for the toxicity will make the chemical  less toxic.

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it was produced by a plant

Answer:

C) 10.2

Explanation:

Formula: Actual-Expected/Expected

The actual was 55.2 while the expected was 50.1

55.2-50.1/50.1=0.101796407 * 100= 10.2%

The percentage error in the student's determination is 10.2%

The correct answer to the question is Option C. 10.2

From the question given above, the following data were obtained:

Measured value = 55.2 °C

Accepted value = 50.1 °C

Next, we shall determine the absolute error. This can be obtained as follow:

Measured value = 55.2 °C

Accepted value = 50.1 °C

Absolute error = |Measured – Accepted|

Absolute error = |55.2 – 50.1|

Finally, we shall determine the percentage error.

Absolute error = 5.1 °C

Accepted value = 50.1 °C

[tex]Percentage error = \frac{Absolute error }{Accepted value} * 100\\\\= \frac{5.1}{50.1} * 100\\\\[/tex]

Therefore, the percentage error in the student's determination is 10.2%.

The correct answer to the question is Option C. 10.2

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Answer:

50.6g Al would be needed

Explanation:

Based on the reaction:

4Al + 3O₂ → 2Al₂O₃

4 moles of aluminium react with 3 moles of oxygen to produce 2 moles of Al₂O₃

To solve this question we need to find the moles of 45g of O₂. Then using the chemical equation find the moles of Al and its mass:

Moles O₂ -Molar mass: 32g/mol-:

45g O₂ * (1mol / 32g) = 1.41 moles O₂

Moles Al:

1.41 moles O₂ * (4mol Al / 3mol O₂) = 1.875 moles Al

Mass Al -Molar mass: 26.98g/mol-:

1.875 moles Al * (26.98g / mol) =

50.6g Al would be needed

The amount of aluminum that would be required to completely react with 45 grams of O2 would be 50.59 grams.

From the balanced equation of the reaction:

[tex]4 Al + 3 O_2 ---> 2 Al_2O_3[/tex]

The mole ratio of Al to O2 is 4:3.

Mole of 45 grams of O2 = mass/molar mass

                                     = 45/32

                                           = 1.4063 moles

Equivalent mole of Al: 4 x 1.4063/3

                                    = 1.875 moles

mass of Al = mole x molar mass

                 = 1.875 x 26.98

                  = 50.59 grams

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Answer:

98.6 Degrees Fahrenheit

Explanation:

To convert from Celsius to Fahrenheit, the formula is F=(1.8*C)+32. Since C=37 in this case, our formula is F=(1.8*37)+32. First, solving the work in the parentheses, 1.8*37=66.6. Adding that will get you to 98.6, so F=98.6.

Answer:

C

Explanation:

bacteria and virus do not have nucleas. so C

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Answer:

Percent mass of oreo = 35.11%

Explanation:

Given:

Mass of oreo =  17.1

Mass of 1st cookie = 16.2

Mass of 3rd cookie = 15.4

Find:

Percent mass of oreo

Computation:

Total mass = Mass of oreo + Mass of 1st cookie + Mass of 3rd cookie

Total mass = 17.1 + 16.2 + 15.4

Total mass = 48.7

Percent mass of oreo = [Mass of oreo/Total mass]100

Percent mass of oreo = [17.1 / 48.7]100

Percent mass of oreo = 35.11%

Answer:

(C3H4O3) x 2 = C6H8O6, the molecular formula for Vitamin C.

Answer:

1 and 3 i think so i could be wrong

Salinity affects density in the following instances:

A. As water temperature decreases, water density increases.

C. As concentration of salt increases, water density also increases.

Salinity can be defined as a measure of the amount of salt that is dissolved in a water body. Thus, it mainly measured in gram per liters.

Density can be defined as mass per unit volume. Also, it is measured in kilogram per cubic meters.

Based on scientific records, salinity affects density in the following instances:

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Answer:

238 is the answer

Explanation:

238 - 146 + 3 = 95

Americium (95Am) is an element that has 95 protons and 146 neutrons in its nucleus of an atom.

Americium is an element that has 95 protons and 146 neutrons. Its symbol is Am. Its atomic mass is 241 amu which is get by addition of proton and neutron.

So we can conclude that Americium (95Am) is an element that has 95 protons and 146 neutrons in its nucleus of an atom.

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Explanation:

Given chemical equation

Zn + HCL ➡ ZnCl2 + H2

Now balancing

Zn + 2HCL ➡ ZnCl2 + H2

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The coefficient placed before HCl which makes the equation to be balanced is 2.

To know which coefficient will be placed before HCl to balance the equation, we shall simply balance the equation given from the question.

Zn + HCl —> ZnCl₂ + H₂

The above equation can be balance as illustrated below:

There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before HCl as shown below:

Zn + 2HCl —> ZnCl₂ + H₂

Now, the equation is balanced.

From the balanced equation above, the coefficient written before HCl which makes the equation to be balance is 2.

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Answer:

radio waves

Explanation:

which has the longest wavelength and lowest frequency and energy. Ultraviolet light (UV) is divided into three regions: UV A, wavelength = 400 - 320 nm UV B, wavelength = 320 - 280 nm

Answer:

[tex]\boxed {\boxed {\sf 0.5043 \ mol \ P}}[/tex]

Explanation:

To convert from moles to grams, we must use the molar mass. This is found on the Periodic Table. Look for Phosphorous or P.

We can use this number as a ratio.

[tex]\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]

Multiply by the given number of grams: 15.62

[tex]15.62 \ g \ P *\frac{30.973762 \ g \ P }{1 \ mol \ P}[/tex]

Flip the fraction so the grams of phosphorus cancel.

[tex]15.62 \ g \ P *\frac{1 \ mol \ P}{30.973762 \ g \ P }[/tex]

[tex]15.62 *\frac{1 \ mol \ P}{30.973762 }[/tex]

[tex]\frac{15.62 \ mol \ P}{30.973762 }[/tex]

Divide.

[tex]0.504297799 \ mol \ P[/tex]

The original measurement of grams has 4 significant figures, so our answer must have the same.

For the number we calculated, that is the ten thousandth place. The 9 in the hundredth thousandth place tells us to round the 2 to a 3.

[tex]0.5043 \ mol \ P[/tex]

There are 0.5043 moles of phosphorus in 15.62 grams.

Answer:

Mass in an isolated system can neither be destroyed nor created.

Explanation:

In a chemical reaction, mass can neither be created nor be destroyed.

Answer:

Many metals (such as zinc, tin, lead, aluminium, and beryllium) form amphoteric oxides or hydroxides. Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide.

Answer:

Lead (II) oxide and zinc (II) oxide

Answer: C something that improves an organisms ability to survive

Answer:

C.

Explanation: