study this chemical reaction: 2ca o2 2cao then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction.

A building is found to contain a radioactive gas. Thirty hours later, 60% of the initial amount of gas is still present.So, we have to calculate the half-life of the radioactive gas.

(a) Write a model for the percentage of the initial amount of the radioactive gas present after t hours. (Round all numerical values to three decimal places.)

Formula used to find the amount of radioactive gas present after t hours:

So, the remaining amount of radioactive gas is 40%.That is, r(t) = 40% = 0.40r₀and t = 30So, the formula becomes:

(b) Calculate the half-life of the radioactive gas. (Round your answer to three decimal places.)From the formula,r(t) = r₀ (1/2)^(t/T)When t = T, r(t) = 1/2 of r₀r(T) = r₀/2Divide both sides by r₀r(T)/r₀ = 1/2We have r(T)/r₀ = 0.5, and the formula becomes 0.5 = (1/2)^(T/T)0.5 = (1/2)^1T = 1Therefore, the half-life of the radioactive gas is one hour.Answer Half-life of the radioactive gas = 1 hour.

Radioactive is the ability of an unstable atomic nucleus to become stable through emission of radiation. This capability involves the process of splitting unstable atomic nuclei resulting in energy loss by emitting radiation, such as alpha particles, beta particles with neutrinos and gamma rays. What is radioactive impact? It is necessary to know, radioactive substances from nuclear radiation are compounds that are harmful to humans and other living things. The effects of nuclear radiation not only damage human DNA, but can also cause cancer. The effects of nuclear radiation can damage the atoms in the body and damage DNA.

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Ethylene and acetylene are the common names for the molecules C2H4 and C2H2, respectively.

Ethylene (C2H4) and Acetylene (C2H2) are hydrocarbons.

Ethylene is a colorless, flammable gas with a sweet odor. It is used in the chemical industry to produce polymers, ethylene oxide, ethylene dichloride, and ethylbenzene. It is used in the production of plastics, synthetic rubber, and other materials.

Acetylene is a colorless, flammable gas with a garlic-like odor. It is used in welding and cutting torches, as well as in the chemical industry to produce several organic chemicals, including 1,4-butynediol, which is used to make spandex fibers.

Both ethylene and acetylene are used in organic chemistry as starting materials to produce other compounds.

Thus, ethylene and acetylene are the common names for the molecules C2H4 and C2H2, respectively.

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Answer:

It seems to be a folded filter paper. But the answer could be funnel as well.

the most realistic answer is a filter paper. Due to x not having a whole at the bottom, it makes sense that it isn't a funnel so it's a filter paper.

The names of the reactants and products, as well as the precise quantity of molecules or moles each of that are consumed or created, are provided by a balanced chemical equation.

A chemical equation represents a chemical reaction symbolically, with the products and reactants denoted by their corresponding chemical formulas. Example: Water is created by the following reaction: 2 H2 Plus O2 2 H2O.

The chemical formula of a compound serves as a representation of its chemical name. It lists the constituents that make up each complex molecule along with the number of atoms in each element.

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The molar mass of citric acid (c6h8o7) is 192.124g/mol

The molar mass of baking soda (nahco3) is 84.007g/mol

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample and is measured in moles. Molar mass is a mass property, not a molecular property of a substance.

Molar mass is the mass of 1 mole of the sample. To find the molar mass, add up the atomic masses (atomic weights) of all the atoms in the molecule. Use the masses listed in the periodic table or atomic weight table to determine the atomic mass of each element.

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The molar mass of citric acid (C6H8O7) : 192.12 g/mol

The molar mass of citric acid (C6H8O7) : 84.007 g/mol

Baking soda is a monosodium salt of carbonic acid with alkalizing and electrolyte substitution properties. When dissociated, baking soda forms sodium and bicarbonate ions. Ion formation increases plasma bicarbonate and buffers excess hydrogen ion concentration, resulting in an increase in blood pH.

Citric acid is a naturally occurring weak acid in all citrus fruits. If you've ever sunk your teeth in a lemon, you've tasted citric acid. Manufacturers add artificial versions of it to processed foods. Drugs containing citric acid treat health problems such as kidney stones.

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Answer: 3.83

Explanation:

Answer:

3.83 :)

Explanation:

:)

Answer:

Using glucose to provide energy for the body

Explanation:

First, we write the reaction and balance it:

HNO2 (aq) + NH3 (aq) = NH4+ + NO2- (Balanced)

Data:

50 mL of 0.2 M HNO2

50 mL of 0.2 M NH3

In total, we have 100 mL, therefore, this solution between HNO2 and NH3 will be diluted in half. I mean: The concentration of HNO2 and NH3 will be 0.10 M

HNO2 (aq) + NH3 (aq) = NH4+ + NO2-

Initial 0.10 M 0.10 M 0 0

reacts -x -x +x +x

Equilibrium 0.10-x 0.10-x +x +x

Now, we write Kc:

Values of x:

For 1) x = 0.0999

For 2)x = 0.1001

We choose number 1) x = 0.0999

Number 2 gives us a value higher than the initial values of concentration

Therefore, concentration in equilibrium of NH3 = 0.10-x =0.10 - 0.0999 = 0.00010M

Answer: A. 0.00010M

Answer: the plasma membrane, the cytoplasm, ribosomes, and genetic material.

hope this helped

Answer:

the answer is A i learned this in class and i had the exact same question

There is 1.0 mole of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution.

To determine the number of moles of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution, we need to use the equation:

moles = concentration (M) × volume (L)

Since 1 liter is equal to 1000 milliliters, we divide 500.0 mL by 1000 to get 0.5 L.

Next, we substitute the values into the equation:

moles = 2.0 M × 0.5 L

The concentration of 2.0 M indicates that there are 2.0 moles of KNO₃ in 1 liter of the solution. Therefore, multiplying the concentration (2.0 M) by the volume (0.5 L) gives us the number of moles of KNO₃:

moles = 2.0 M × 0.5 L = 1.0 mol

Hence, there is 1.0 mole of KNO3 in 500.0 mL of a 2.0 M KNO₃ solution.

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Answer:

the graph shows that the filtrated solution was acidic but when we add nh3 (base) ,acid base reaction take place and in this reaction salt and water are form by this oh-ion concentration keep on increasing and change ph from 4 to 10

the pH of the resultant solution is 6.4.

The pH of the resultant solution can be determined using the following formula: pH = pKₐ + log10([A-]/[HA]) where [A-] is the concentration of the ionized form and [HA] is the concentration of the non-ionized form. The ratio of non-ionized to ionized species is given as 10:1. This means that the concentration of non-ionized form is 10 times greater than the ionized form. Let x be the concentration of the ionized form. Then the concentration of non-ionized form would be 10x. Since the ratio of nonionized to ionized species is 10:1, we have:[HA] / [A-] = 10/1(10x) / x = 10/1x = (1/10) m/M. Substituting this information into the formula above: pH = 7.4 + log10[(1/10) / 1]= 7.4 - 1= 6.4.Therefore, the pH of the resultant solution is 6.4.

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The functional group present in the compound 3-methylbutyl acetate is an ester.

An ester is a compound that consists of a carbonyl group (C=O) bonded to an oxygen atom, which is then bonded to an alkyl or aryl group. In 3-methylbutyl acetate, the "acetate" portion represents the ester functional group. The carbonyl group is part of the acetate moiety (CH3COO-), while the alkyl group "3-methylbutyl" is attached to the oxygen atom.

The presence of the ester functional group imparts specific chemical properties to the compound. Esters often have pleasant odors and are commonly found in various fragrances and flavors. They are also used in the production of solvents, plasticizers, and pharmaceuticals. The ester functional group is characterized by its distinctive carbonyl stretching vibration in infrared spectroscopy and can undergo hydrolysis or esterification reactions.

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Answer:

the particles must 1. collide

2. with sufficient energy

3. in proper orientation.

Explanation:

hope this helps

The structure of trans-5,5-dichloro-3-octene is:

\(CH_{3}\) - \(CH_{2}\) - \(CH_{2}\) - \(C\)\((Cl_{2} )\) - \(CH\)≈\(CH\) - \(CH_{2} - CH_{3}\)

What is stereochemistry?

Stereochemistry, a subdiscipline of chemistry, involves the study of the relative spatial arrangements and manipulations of the atoms that make up the structure of molecules. The study of stereochemistry focuses on the relationships between stereoisomers. Stereoisomers, by definition, have the same arrangement (constitution) of the atoms bonded to the molecular formula, but differ in their structural formula (the three-dimensional orientation of the atoms in space). Therefore, it is also called 3D chemistry. The prefix "stereo" means "three-dimensionality".

Stereochemistry covers the entire spectrum of organic, inorganic, biological, physical and especially supramolecular chemistry. Stereochemistry includes methods for determining and describing these relationships. The effect these relationships have on the physical or biological properties of the molecule in question, and how these relationships affect the reactivity of the molecule in question (dynamic stereochemistry).

Hence, the structure of trans-5,5-dichloro-3-octene is:

\(CH_{3}\) - \(CH_{2}\) - \(CH_{2}\) - \(C\)\((Cl_{2} )\) - \(CH\)≈\(CH\) - \(CH_{2} - CH_{3}\)

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The IUPAC name for O3 is Trioxygen

Trioxygen is one of the three allotropes of the element oxygen

the compound has 3 atoms of oxygen bonded together

The compound is mostly found in the stratosphere where it forms a layer that absorbs ultraviolet rays the radiation  and convert them to thermal energy  preventing them from reaching the planet's surface.

The layer is quakily diminishing because of combining with halogens, especially chlorine and bromine atoms this is because  Trioxygen  is a reactive  gas thats why it compines with bromine and chroline.

The gas also is used in industries for the  purification of air and drinking water bleaching and industrial treatment of wastes.

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Answer:

92.01 g/mol

Explanation:

So first you need to find the empirical formula by the percents. That would be, assuming that you have 100 grams of the the sample, divide each quantity of each element found by its respective molar mass.

30.4 g of N ÷ 14 g/mol N= 2.17 mol of N

69.6 g of O ÷ 16g/mol= 4.35 mol of O

You can establish now the empirical formula.

N2.17O4.35,

but since you can't have a decimal subscript, you divide each subscript by the minimum subscript

NO2

So then you're said that the molecular formula derived from that empirical formula has 2 nitrogen, so you multiply all the subscripts, by 2:

N2O4

-Dinitrogen Tetraoxide

-Nitrogen oxide (IV)

Then all you have to do is find the molecular mass of the compound using the periodic table and what you obtain is the molar mass.

remember: molecular mass is correspondent to molar mass.

Answer:

Explanation:

Stars are powered by nuclear fusion in their cores, mostly converting hydrogen into helium. The production of new elements via nuclear reactions is called nucleosynthesis. A star's mass determines what other type of nucleosynthesis occurs in its core (or during explosive changes in its life cycle).

Answer:

5.0 x 10^-7

Explanation:

[H+]=10^-6.3

Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

Answer:

D

Explanation:

not all atoms would be the same size. As for they vary scaleing from left to right in the periodic table.

Answer:

detail is given below.

Explanation:

The charged particles of nucleus are protons while neutrons are neutral having no charge.

We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus.

Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg and 1.674929×10⁻²⁷ Kg respectively.

Symbol of proton= P⁺  

Symbol of neutron= n⁰  

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons.

one proton contribute 1 amu to the total weight. There are 20 protons and 20 neutrons in Ca thus its atomic mass is 40 amu.

While the atomic number is 20.

B

The sodium hydroxide (NaOH) solution is a basic solution, so the pH of that solution should be close to 14

then when adding hydrochloric acid (HCl) we start to neutralice the solution, meaning the pH must sift slowly to lower pH.

Assuming both solutions have similar concentration the pH shall shift form basic (above 7) to acid pH (below 7). Until now both B and D images agreed with the explanation given. To chose between them we need to remember that HCl is a very strong acid, which means that in solution will get to very acid solutions (very low pH values) which leaves only B as possible answer

Answer:

D

Explanation:

Because 30c is kevin and add 303+30=333-30=303

The difference in temperature of the two glasses of water is 30°C. The difference in temperature on the Kelvin scale is 86 K D. 303 K. Therefore, option B is correct.

The term temperature is refer to the degree of hotness or coldness of an object.Temperature is measured with a thermometer. Temperature is the measure of average kinetic energy of a system.

There are main three different scales are commonly used to measure temperature that are Fahrenheit (expressed as °F), Celsius (°C), and Kelvin (K).

The difference in temperature of the two glasses of water is 30°C. The difference in temperature on the Kelvin scale is 86 K D. 303 K. Because at 30°c in Kelvin = 273 + 30

= 303 kelvin

Thus, option B is correct.

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The percent sugar concentration in orange soda is approximately 13.24%.

The volume of orange soda is given as 355 mL and its density is given as 1.043 g/mL. According to the nutrition label, there are 49 g of sugar in a 355 mL serving of orange soda.Using the density, we can convert the 355 mL volume into grams as follows:Volume = 355 mL; Density = 1.043 g/mL; Mass = ?To convert mL to g we need to multiply the volume with the density. Thus,Mass = Volume x Density= 355 x 1.043= 369.965 gThus, the mass of a 355 mL serving of orange soda is approximately 369.965 g.Next, we can calculate the percentage of sugar in the beverage as follows:Percent sugar concentration = (Mass of sugar / Total mass of beverage) x 100%Percent sugar concentration = (49 g / 369.965 g) x 100%Percent sugar concentration = 0.1324 x 100%Percent sugar concentration = 13.24%Therefore, the percent sugar concentration in orange soda is approximately 13.24%.

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The statement among the available options that describes the result of the study is that less than 50% of the people never felt phantom pain. Option 2.

In order to interpret the data and find the best description of the outcome of the experiment, the response needs to be grouped into 2 from the 3 available responses.

Since those that phantom pain sometimes and always belong to the same category, the respondents can be summed up into one:

Number of those that sometimes feel phantom pain = 534

Number of those that always feel phantom pain = 193

Total number of people that feel phantom pain = 534 + 193

                                                                                = 727 people

Number of people that never feel phantom pain = 183

Total number of respondents in the experiment = 183 + 534 + 193

                                                                                = 910 people

Percentage of respondents that felt phantom pain = 727/910 x 100

                                                                                     = 79.89%

Percentage of people that never felt phantom pain = 183/910 x 100

                                                                                      = 20.11%

Percentage of people that felt phantom pain all the time = 193/910 x 100

                                                                                      = 21.21%

Thus, the statement that correctly describes the outcome of the experiment of all the statements is that less than 50% never felt phantom pain.

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Therefore, the pH value of the solutions with [H+] values of 0.01, 1.0 x 10 –8, and 4.67 x 10 –4 are 2.0, 8.0, and 3.33 respectively.

pH is a measure of acidity or alkalinity of a solution and ranges from 0 to 14.

The value of pH is defined as the negative logarithm of hydrogen ion concentration. The hydrogen ion concentration in a solution is a measure of its acidity or basicity. The higher the hydrogen ion concentration, the lower the pH value, and the solution is more acidic. Similarly, the lower the hydrogen ion concentration, the higher the pH value, and the solution is more alkaline.

Hence, the pH value of the solutions with the given [H+] values can be calculated as follows:

a) [H+] = 0.01pH

= -log[H+]

= -log(0.01)

= 2.0

b) [H+] = 1.0 x 10 –8 pH

= -log[H+]

= -log(1.0 x 10 –8)

= 8.0

c) [H+] = 4.67 x 10 –4 pH

= -log[H+]

= -log(4.67 x 10 –4)

= 3.33

It is important to remember that the hydrogen ion concentration [H+] is measured in moles per liter (mol/L), and the pH value of a solution can be calculated using the formula: pH = -log[H+].

Also, the negative sign in the formula indicates that the pH value is inversely proportional to the hydrogen ion concentration.

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Answer:

below

Explanation:

From periodic table the shell electrons are 2 8 and 6 so:

   1s2          2s2   2p6          3s2   3 p4        for sulfur

the noble gas config is then  (neon + 6) =

     [Ne]   3s2   3p4

Explanation:

P_H

and

li_n

hope it helps