Scientists say that photosynthesis and cellular respiration create a cycle that is essential to almost all life on Earth. Use your knowledge of these processes to explain how an oil spill that kills a large percentage of the photosynthetic organisms living in the ocean could affect humans.​

Answer:

11

Explanation:

Answer:

11 gaseous elements are there in periodic table.

Explanation:

2moles of NaOH -> 2moles of H2O

so the number of moles r equal.

hence moles of H2O is 12.5

Answer:

K = 0.167

Explanation:

The equilibrium constant, K of a reaction, is defined as the ratio of the concentrations of products and concentrations of reactants.

For the reactions:

A + B ⇄ C + D

For the definition, K is:

K = [C] [D] / [A] [B]

K = [4.0M] [4.0M] / [9.6M] [10.0M]

Answer:

It should be 115.5 amu but you didnt type that as an answer choice so...

Explanation:

Bruh all you had to do was add oxygen and sulfur and subtract from the total to get your answer :D.

The correct answer is True. An aqueous solution means that it is a solution where the solvent is water. In this case, the solution contains 30.0% mass ammonia (NH3) and has a density of 0.892 g/ml. This means that 100 grams of the solution contains 30 grams of ammonia and 70 grams of water.

An aqueous solution containing 30.0% mass ammonia (NH3) can have a density of 0.892 g/mL. The density of the solution is less than 1 g/ml, which is expected since adding ammonia to water lowers the overall density. The density can be calculated by dividing the mass of the solution by its volume, and since the solution has a density of 0.892 g/ml, it means that 1 ml of the solution weighs 0.892 grams. Overall, an aqueous solution with 30.0% mass ammonia and a density of 0.892 g/ml is a true statement. With a 30.0% mass ammonia concentration and a density of 0.892 g/mL, this particular solution falls within the range of possible aqueous ammonia solutions.

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The number of protons, electrons and neutrons in 153 X³+ is 65, 62 and 88 respectively.

An atom is the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

The atom is made up of three subatomic particles namely; protons, neutrons and electrons.

The proton of an atom is the same as the atomic number for a neutral atom. The mass number is the sum of the proton and neutron in the atom.

According to this question, the mass number of atom X is 153 and the atomic number is 65. This means that;

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The radioisotope that would decay the most ought to be Fr-220. Option C

The term half life of the radioactive isotope has to do with the time that it would take for us to have only half of the number of the original radioactive atoms to be left. We have to find the half life of each of the isotopes so that we can be able to get the one that has decayed the most.

For P - 32

Half life = 14.3 days

Using;

N/No = (1/2)^t/\(t_{\frac{1}{2} }\)

N = amount present at time t

No = initial amount

t = time taken

\(t_{\frac{1}{2} }\) = half life

Hence;

N/10 = (1/2)^28/14.3

N =  (1/2)^28/14.3 * 10

N = 2.6 g

For Kr-85

Half life 10.76 years or 3927.4 days

N/10 =  (1/2)^3927.4/28

N =  (1/2)^3927.4/28 * 10

N = 5.97 * 10^-47 g

For Fr-220;

27.40 seconds or 0.00032 days

N/10 =  (1/2)^0.00032 days/28 days

N =  (1/2)^0.00032 days/28 days * 10

N = 10 g

For  I-131

Half life = 8 days

N/10 =  (1/2)^8/28

N = (1/2)^8/28 * 10

N = 8.2 g

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On the periodic table, hydrogen and helium are the only two elements in the first row, or period, which reflects that they only have electrons in their first shell. Hydrogen and helium are the only two elements that have electrons exclusively in the 1 s 1s 1s orbital in their neutral, non-charged, state.

Answer:Potassium react with elemental chlorine, an electron transfers from a potassium atom to a chlorine atom, forming potassium ion and chloride ion. ... As the bond formation between ions, the bond will be ionic. This is because, this process of transfer of electrons from one atom (K) to another atom (Cl).

Explanation:

Answer:

Explanation:

Most molecular compounds that have a mass similar to water are gases at room temperature. Because of the strong hydrogen bonds, water molecules are able to stay condensed in the liquid state, but, because of the hydrogen bonds, as water molecules come together they stick to one another for a small, but significant amount of time. Molecular water, therefore, is a liquid at room temperature

The four territories that provide the "bottomless reserve of cheap labor"  were China, India, southeast Asia and parts of Africa. The irony of the exploited labor is that despite being the backbone of the global economy and contributing to the wealth of developed countries.

The four territories that provide the "bottomless reserve of cheap labor" referred to in 187 are likely to be countries or regions in the developing world with large populations and low wages, such as China, India, Southeast Asia, and parts of Africa.

These territories are often exploited by multinational corporations seeking to maximize profits by outsourcing production to these regions where labor is cheap and often unprotected by strong labor laws or unions.

The irony of the exploited labor is that despite being the backbone of the global economy and contributing to the wealth of developed countries, the workers in these regions often live in poverty and face harsh working conditions. They are paid low wages, subjected to long hours, and lack basic benefits such as health insurance and job security. The irony lies in the fact that the workers who are contributing to the wealth and prosperity of others are often themselves unable to enjoy a decent standard of living.

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Answer:

The mass of chlorine to react completely with 5.0  moles of aluminum is 531.75 grams.

Explanation:

Aluminum reacts with chlorine gas to form aluminum chloride through the following reaction, which is balanced (In a chemical equation, the number of atoms of each element in the reactants must be equal to the number of atoms of each element in the products In order to comply with the Law of Conservation of Mass, that is, in a chemical reaction the mass remains constant, that is, the mass that is consumed from the reactants is the same as that obtained from the products of the reaction):

2 Al + 3 Cl₂ ⇒ 2 AlCl₃

The rule of three is a way of solving problems of proportionality between three known values ​​and one unknown, establishing a proportionality relationship between all of them. A proportionality is direct when one magnitude increases the other also does it, and if the magnitude decreases the other in the same way. In this case, the rule of three, knowing a, b and c and with x being the unknown, is applied as follows:

a ⇒ b

c ⇒ x

So \(x=\frac{c*b}{a}\)

In this case the rule of three can be applied as follows: if by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction) 2 moles of aluminum react with 3 moles of chlorine, 5 moles of aluminum with how many moles of chlorine do they react?

\(moles of chlorine=\frac{5 moles of aluminum*3 moles of chlorine}{2 moles of aluminum }\)

moles of chlorine= 7.5

Since the molar mass of the gas Cl2 is 70.9 grams/mole, you can apply the following rule of three: if 1 mole has 70.9 grams, 7.5 moles, how much mass does it have?

\(mass of chlorine=\frac{70.9 grams*7.5 moles}{1 mole}\)

mass of chlorine= 531.75 grams

The mass of chlorine to react completely with 5.0  moles of aluminum is 531.75 grams.

a. Entropy, S = S(U, L, N) for the one-dimensional gas is given by the Sackur-Tetrode equation which is given by:

b. The equation of state, P= P(T, L, N) for the one-dimensional gas is given by the equation of state for an ideal gas which is given by:

Gas is one of the four basic states of matter. Pure gases can be made up of atoms, elemental molecules made up of one type of atom, or compound molecules made up of many kinds of atoms. A mixture of gases will contain as many pure gases as air. Each gas has the same volume at the same temperature and pressure according to Avogadro's law. The volume of 1 mole of gas is 22.4 liters at standard conditions. Here are examples of gaseous objects around you. Air. Smoke. Nitrogen.

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The average atomic mass of the element, given the various isotopic mass of the element, is 87.71 amu

The following data were obtained from the question given above:

The average atomic mass of the element is defined by the following formula:

Average atomic mass = [(Mass of 1st × 1st%) / 100] + [(Mass of 2nd × 2nd%) / 100] + [(Mass of 3rd × 3rd%) / 100] + [(Mass of 4th × 4th%) / 100]

Inputting the given parameters, we have:

= [(84 × 0.56) / 100] + [(86 × 9.86) / 100] + [(87 × 7) / 100] + [(88 × 82.58) / 100]

= 0.4704 + 8.4796 + 6.09 + 72.6704

= 87.71 amu

Thus, the average atomic mass of the element is 87.71 amu

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the formula below for the application of KVL around i1 is KVL around loop i1: -10V + 5Ω * (I1 - I2) + 10Ω * I1 = 0.

According to Kirchhoff's Voltage Law (KVL), the sum of the voltages around a closed loop in a circuit is equal to zero. In this case, we are applying KVL around loop i1. The equation represents the sum of voltage drops in the loop, where -10V is a voltage source, 5Ω * (I1 - I2) represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and 10Ω * I1 represents the voltage drop across the 10Ω resistor due to the current I1. The equation is set equal to zero to satisfy KVL.

ii. KVL around loop i2: 10Ω * I2 - 5Ω * (I1 - I2) + 2V = 0

Similar to i, this equation represents the application of KVL around loop i2. The 10Ω * I2 term represents the voltage drop across the 10Ω resistor due to the current I2, the -5Ω * (I1 - I2) term represents the voltage drop across the 5Ω resistor due to the difference in mesh currents I1 and I2, and the 2V term represents a voltage source. The equation is set equal to zero to satisfy KVL.

iii. Determine the current i1: Substitute the obtained values into the equation for i1 and solve for I1 in mA.

iv. Determine the current i2: Substitute the obtained values into the equation for i2 and solve for I2 in mA.

v. Determine Vo: Substitute the obtained values for i1 and i2 into the appropriate equation representing the voltage at Vo, and calculate the value in V.

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Answer:

b

Explanation:

I hoped this helped u have a great day

Answer:

the awnser is D

Explanation:

because all elements have to be capitalized

If the concentration of NaCl is 4.86 m, when it begins to crystallize out of solution, then is the ksp is 23.61

the reaction is given as:

NaCl --->  Na⁺   +   Cl⁻

               4.86      4.86

The Ksp for the following is given as :

ksp = [Na⁺] [Cl⁻]

ksp = 4.86 × 4.86

ksp = 23.61

The solubility product constant ksp is the type of equilibrium constant. the solubility product constant ksp increases with increase in temperature with increase in the solubility.

Thus, If the concentration of NaCl is 4.86 m, when it begins to crystallize out of solution, then is the ksp is 23.61 .

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Answer:

a jagged black line along the right side of the table separates the metals from the nonmetals. The metals are to the left of the line, the nonmetals are to the right of the line, and the elements immediately next to the line are the metalloids.

Explanation:

The electronic configuration helps to determine if the element is a metal or non-metal.

Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.

Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.

Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.

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The p-value is greater than the significance level of 0.05, we do not reject the null hypothesis and conclude that all proportions are equal.

Firstly, let us conduct a Chi-square test of independence of categorical variables based on the information given above. We have three different cases of hypothesis testing that we have to solve one by one.

Case 1: HD​:pSun ​=rhoMan ​=pTue ​=pWed ​=pThu ​=pFri ​=pSat ​=71​
Ha​ : Not all proportions are equal.

Test Statistic
For this hypothesis, we need to compute the test statistic that is given as:
\($$\chi^2=\sum_{i=1}^{k}\frac{(O_i-E_i)^2}{E_i}$$\)  where k is the number of groups/categories. Since we have 7 days of the week, \(k = 7. $O_i$ and $E_i$\) are the observed and expected frequencies respectively.  
Here, we have equal proportions of 71 for each day of the week.
Therefore, the expected frequencies are also equal to 71.
\($$E_i = 71, i=1,2,3,4,5,6,7.$$\)

We also have to use the given information to compute the observed frequencies,
\($O_i$.$$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126$$\)

Therefore, the test statistic can be computed as \($$\chi^2=\frac{(90-71)^2}{71} + \frac{(99-71)^2}{71} + \frac{(122-71)^2}{71} + \frac{(123-71)^2}{71} + \frac{(130-71)^2}{71} + \frac{(160-71)^2}{71} + \frac{(126-71)^2}{71}$$$$\chi^2=180.14\)

Now we have to find the p-value of this test. Since the number of degrees of freedom is k - 1 = 7 - 1 = 6, the p-value can be found using the chi-square distribution table with 6 degrees of freedom at the 0.05 significance level. The p-value is 0.000014. ConclusionSince the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that not all proportions are equal.

The total number of accidents is \($$90+99+122+123+130+160+126=850$$\)

The percentage of accidents occurring on each day of the week can be found as follows:
\($$Sunday: $$\frac{90}{850}\times 100 = 10.59\%$$Monday: $$\frac{99}{850}\times 100 = 11.65\%$$Tuesday: $$\frac{122}{850}\times 100 = 14.35\%$$Wednesday: $$\frac{123}{850}\times 100 = 14.47\%$$Thursday: $$\frac{130}{850}\times 100 = 15.29\%$$Friday: $$\frac{160}{850}\times 100 = 18.82\%$$Saturday: $$\frac{126}{850}\times 100 = 14.82\%$$\)

From the above percentages, we can see that Friday has the highest percentage of traffic accidents.

Case 2:
HD​: Not all proportions are equal.

Ha​:pSun ​=pMon ​=pTue ​=rhoWed ​=pThu ​=rhoFri ​=rhoSat ​=71

Test Statistic

\($$E_1 = 78.57, E_2 = 86.57, E_3 = 106.86, E_4 = 107.43, E_5 = 113.57, E_6 = 139.43, E_7 = 109.14$$\)

We already know the observed frequencies,
\($$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126.$$\)

The test statistic can be computed as:

\($$\chi^2=\frac{(90-78.57)^2}{78.57} + \frac{(99-86.57)^2}{86.57} + \frac{(122-106.86)^2}{106.86}+ \frac{(123-107.43)^2}{107.43} + \frac{(130-113.57)^2}{113.57} + \frac{(160-139.43)^2}{139.43} + \frac{(126-109.14)^2}{109.14} $$$$ \implies \chi^2=34.98$$\)
The p-value is 0.000001.
Conclusion- Since the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that not all proportions are equal.

Case 3:

All proportions are equal.
Test Statistic
The expected frequency for each group is
\(E = \frac{850}{7} = 121.43\)
We already know the observed frequencies,
\($$O_1 = 90, O_2 = 99, O_3 = 122, O_4 = 123, O_5 = 130, O_6 = 160, O_7 = 126.$$\)

The test statistic is,

\($$\chi^2=\frac{(90-121.43)^2}{121.43} + \frac{(99-121.43)^2}{121.43} + \frac{(122-121.43)^2}{121.43} + \frac{(123-121.43)^2}{121.43} + \frac{(130-121.43)^2}{121.43} + \frac{(160-121.43)^2}{121.43} + \frac{(126-121.43)^2}{121.43}} \\\implies \chi^2=9.17$$\)

The p-value is 0.1664.

Since the p-value is greater than the significance level of 0.05, we do not reject the null hypothesis and conclude that all proportions are equal.

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answer and explanation

the first step is to balance the reaction equation

N₂ + 2O₂ > 2NO₂

now that we have balanced the equation we can calculate the number of moles of nitrogen

mols = mass / molar mass

= 62.7 g/ 14.00g/mol

= 4.48 mols

we see from the balanced equation that the mol ratio of nitrogen and nitrogen oxide is 1:2

therefor the number of mols of nitrogen oxide that will form will be

2 x 4.48 = 8.96 mol of nitrogen oxide.

now that we have the mols we can then calculate the volume using the ideal gas equation

PV =nRT

V = (nRT)/P

= (8.96 x 0.0821 x 620) / 0.72

= 633.5L

The half life of a radioactive material is inversely proportional to the decay constant and it is completely independent of the amount of it present initially. Here the number of atoms which remain after the decay of radioactive material is

The half-life period of a radionuclide is the time required for the decay of the one half of the amount of the species. The half life period is a characteristic of a radionuclide. The half-lives of different radionuclides vary from fractions of seconds to billions of years.

The amount remaining after 3 half-lives can be obtained as:

N = N₀ / 2ⁿ

N = 800000 / 2³

N = 800000 / 8

N = 100,000

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Answer:

2m

Explanation:

Hope this helps :)

Answer:

Answer is B.

Explanation:

3mol/6kg = 0.5m

1. matter

2. oxygen

3. water

4. hydrogen

5. compound

hope it helps :)

Based on the location on the periodic table, potassium has the same number of valence electrons as sodium so it will explode in water (option B).

The periodic table is a tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).

On the periodic table, elements in the same group exhibits the same chemical properties because they possess the same number of valence electrons.

According to this question, when sodium (Na) is mixed with water, an explosion takes place. Since pottasium and sodium are in the same group, it will also explode when in a reaction with water.

Therefore, based on the location on the periodic table, potassium has the same number of valence electrons as sodium so it will explode in water.

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Explanation:

Physical changes are caused by forces like motion, temperature, and pressure. 

Answer:

It can lose it's electrion

Explanation:

Answer:

A. 1s²2s²

B. 1s²

C. 1s²

D. 1s²2s²2p⁶

Explanation:

The valency electron is the outer electron of an element. The valency electron resides in the outermost region of the shell.

Using the general configuration for the first 20 elements 2 8 8 2 the valency electrons can be identified.

A. 1s²2s²2p⁶3s² . The valency electron here are 2p⁶ and 3s² . Removing the valency electron we have 1s²2s²

B. 1s² 2s² 2p⁶. After removing the valency electron the configuration will be 1s².

C.1s²2s². After removing the valency electron the configuration will be 1s²

D.1s²2s²2p⁶3s¹. Removing the valency electron the electron configuration will be 1s²2s²2p⁶

If a cylinder of helium gas takes up 22.4 liters of space at STP, then there are 6.022 x 10²³ atoms of helium in the cylinder at STP.

At STP (standard temperature and pressure), the volume of one mole of any gas is 22.4 liters. Helium is a monatomic gas, which means that each helium atom exists as a separate entity, rather than being bound up in a molecule with other atoms.

Therefore, one mole of helium gas contains 6.022 x 10²³ helium atoms. Since the cylinder contains 22.4 liters of helium gas at STP, it must contain one mole of helium atoms, which means that there are 6.022 x 10²³ atoms of helium in the cylinder.

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Answer:

can only form one hydrogen bond each

Explanation:

can only form one hydrogen bond each