4. What is the frequency of light with a wavelength of 1.87 x 10-14 m?
a. Known values:
b. Equation:
c. Work:
d. Answer:

An exothermic process is one that gives off heat.

Explanation:

This heat is transferred to the surroundings. An endothermic process is one in which heat has to be supplied to the system from the surroundings.

The following statement is NOT true of nitroglycerin is "c) Sublingual nitroglycerin is a stable medication and is effective until the expiration date whether the bottle has been opened or not."   The correct answer is option C.

Explanation: Nitroglycerin is a potent vasodilator that is often used in the treatment of angina. Nitroglycerin is a nitrate medication that is used to treat angina and other heart conditions. The side effects of nitroglycerin include headache, hypotension, and tachycardia, among others. When using sublingual nitroglycerin, the patient should have a moist mouth so that the medication will dissolve. Nitroglycerin is not a stable medication, and it is not effective until the expiration date whether the bottle has been opened or not. The shelf life of nitroglycerin is around six months. Nicotinic acid is a true statement. Nicotinic acid, also known as niacin, is a B vitamin that is used to treat high cholesterol and triglyceride levels.

The correct answer is option C.

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The numerical represented by X IN THE GENERAL formulaa for a hydrate ,salt XH2O is water of crystallization

Give an illustration of what water of crystallization is.

The water of crystallization refers to the amount of water molecules that make up one salt formula unit. The presence of water molecules can be seen, for instance, in hydrated copper sulfate (CuSO4.5H 2 O). As a result, this hydrated species contains the water that causes precipitation. A dot separates the primary formula from the water of crystallization, as you can see.

The quantity of water molecules present as crystallization water is indicated by the letter X in the general expression, XH2O. X molecules of water serve as the precipitation water in each molecule of the hydrated salt, according to this.

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a) Data:

F = 600 N

t = 1.5 s

The equation for Impulse:

Impulse = I = F x t,

then the change in momentum: pf - pi

Impulse and the change in momentum are related like this:

pf - pi = I = F x t = 600 N x 1.5 s = 900 N.s

Therefore the change in momentum: pf-pi = 900 N.s

b) Velocity (t) = initial velocity + a x t

We can assume initial velocity = 0 m/s

From F = m x a = mass x acceleration, we clear "a",

m = 275 g = 0.275 kg (1 kg = 1000 g)

Then, F/m = a => 600 N/0.275 kg = 2182 m/s^2

Velocity (t) = 0 + 2182 m/s^2 x 1.5 s = 3273 m/s

Velocity = 3273 m/s

North Africa in the seventh century was not the simplest region to found a new city.

Fighting the Byzantines, persuading the native Berbers of North Africa to submit to centralized Muslim administration, and enticing Middle Eastern traders to settle in North Africa were all necessary.

So, in what would become Kairouan in modern-day Tunisia, conquering general Sidi Okba built a Friday Mosque (masjid-i jami' orjami') in 670 CE.On the Muslim holy day of Friday, communal prayers are held at a Friday mosque.

The mosque was a crucial addition because it conveyed an important distinction for the time and place—that Kairouan would develop into a cosmopolitan metropolis under strong Muslim leadership.

The Great Mosque of Kairouan, commonly known as the Great Mosque, is a prime example of a hypostyle mosque and exhibits how pre-Islamic and eastern Islamic art and elements were blended into the sacred architecture of Islamic North Africa.

The aesthetics indicated that Kairouan was a part of the expanding Islamic empire and that the Great Mosque, Kairouan, and consequently its supporters, were equally important to the region's other religious institutions, cities, and emperors.

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The factor that make the climates different at Missoula, MT and Cape Elizabeth, ME is C. altitude and proximity to large bodies of water.

Missoula, MT is located in a high-altitude region and is far from large bodies of water, which results in a continental climate with cold winters and hot summers.

Cape Elizabeth, ME is located at a lower altitude and is near the Atlantic Ocean, which results in a maritime climate with mild winters and cool summers.

In conclusion, one of the factors that endures that the climates in Missoula and Cape Elizabeth, is the altitude as well as how close they are to oceans.

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Answer: come on man its not that hard

Explanation:

Molality is defined as the "moles solute/kg solvent." Therefore, the correct option is (b).

What is Molality?

Molality (m) is a measure of the concentration of a solute in a solution, and is defined as the number of moles of solute per kilogram of solvent.

The equation for molality is:

m = moles of solute / mass of solvent in kg

Concentration is the ability to focus one's attention and mental effort on a specific task or activity. It involves filtering out distractions and staying attentive to the task at hand. The level of concentration can vary depending on the person, the task, and the environment.

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The molecular formula if the molar mass is 92 g/mol if the empirical formula is nitrogen dioxide then the molecular formula is N₂O₄.

An empirical formula is a simple expression of the relative numbers of atoms of each element present in a compound. It is typically written as a chemical formula in the form of a whole number ratio, such as CH2O for glucose, denoting that there are two atoms of hydrogen for every one atom of carbon and one atom of oxygen. Empirical formulas are not the same as true chemical formulas, which also list the arrangement of atoms in a compound.

Molecular formula = (empirical formula) × \(\frac{molar mass}{empirical formula mass}\)

Empirical formula for nitrogen dioxide is NO₂

Empirical formula mass = 2×(16)+32 = 64

Molecular Formula = NO₂ x (\(\frac{92}{64}\)) = NO₂ x 1.4375 = \(N_1_._4_3_7_5O_2_._8_7_5\)

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Answer:

0.375 moles of CaCO₃ are required

Explanation:

Given data:

Number of moles of sulfamic acid = 0.75 mol

Number of moles of calcium carbonate required = ?

Solution:

Chemical equation:

2H₃NSO₃ + CaCO₃     →        Ca(SO₃NH₂)₂ + CO₂ + H₂O

Now we will compare the moles of H₃NSO₃  and CaCO₃ .

                H₃NSO₃           :            CaCO₃  

                     2                 :             1

                   0.75              :           1/2×0.75 = 0.375 mol

Thus, 0.375 moles of CaCO₃ are required.

The moles of the product and the reactant in the reaction is given by the stoichiometric law. The moles of calcium carbonate in the reaction is 0.375 mol.

The stoichiometric law defines that the moles of the reactant and the product in the reaction is equivalent to the stoichiometric coefficient in the balanced chemical equation.

From the given balanced chemical equation, 1 mole of calcium carbonate reacts with 2 moles of sulfamic acid.

The moles of calcium carbonate react with 0.75 moles of sulfamic acid is:

\(\rm 2\;mol\;H_3NSO_3=1\;mol\;CaCO_3\\0.75\;mol\;H_3NSO_3=\dfrac{1}{2}\;\times\;0.75\;mol\;CaCO_3\\ 0.75\;mol\;H_3NSO_3=0.375\;mol\;CaCO_3\)

The moles of calcium carbonate in the reaction will be 0.375 mol.

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1. To calculate the number of nanograms equivalent to 0.0078 mg, you need to multiply 0.0078 mg by the conversion factor of 1,000,000 ng/mg. The result is 7,800 nanograms (ng). 2. To convert 300 decigrams (dg) to micrograms (μg), you need to multiply 300 dg by the conversion factor of 100 μg/dg. The result is 3,000 micrograms (μg).

1. To calculate the number of nanograms equivalent to 0.0078 mg, conversion factors and the relationship between milligrams and nanograms need to be used. Direct calculation from milligrams to nanograms is not possible without considering the appropriate conversion factors.

To convert milligrams to nanograms, we need to consider the conversion factor: 1 milligram (mg) is equal to 1,000,000 nanograms (ng). By multiplying 0.0078 mg by the conversion factor (1,000,000 ng/mg), we can determine the equivalent value in nanograms.

0.0078 mg is equal to 7,800 nanograms (ng). The conversion from milligrams to nanograms requires the use of appropriate conversion factors, as the units differ by six orders of magnitude. It is essential to employ the correct conversion factors when converting between different units of measurement.

2. 300 decigrams (dg) is equal to 3,000 micrograms (μg).

To convert decigrams to micrograms, we need to consider the conversion factor: 1 decigram (dg) is equal to 100 micrograms (μg). By multiplying 300 dg by the conversion factor (100 μg/dg), we can determine the equivalent value in micrograms.

300 decigrams is equal to 3,000 micrograms. The conversion from decigrams to micrograms requires the use of the appropriate conversion factor, where decigrams are multiplied by 100 to obtain micrograms. Conversion factors play a crucial role in accurately converting between different units of measurement.

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In an ecosystem, the food and plants we eat also depend on water as they are inter-related.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different types of ecosystem present.

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Answejust put my mum said i didnt have to do this question

Explanation:

becuase im cool like that

Answer:

Where are the answer choices

?

Based on the results obtained, the sample with the shortest time taken for the color change to occur contains the largest number of carbon to carbon double bonds.

What is Saturated Fat?

Saturated fat is a type of fat in which all the carbon atoms in the fatty acid chains are bonded to hydrogen atoms, leaving no double bonds between the carbon atoms. This results in a straight and rigid molecular structure that allows the fat molecules to pack tightly together, leading to a solid or semi-solid consistency at room temperature. Saturated fats are commonly found in animal products, such as meat and dairy, as well as in some plant-based sources like coconut and palm oil. A diet high in saturated fats has been linked to an increased risk of heart disease and other health problems.

The sample with the largest number of carbon to carbon double bonds will react the fastest with the bromine water, resulting in the quickest color change from orange to colorless. Therefore, the sample with the shortest time taken for the color change to occur will contain the largest number of carbon to carbon double bonds.

Therefore, the sample that contains the most carbon to carbon double bonds can be determined by comparing the times taken for the color change to occur in each sample.

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Whole blood is a complex fluid that circulates throughout the body. It is composed of various components, including red blood cells, white blood cells, platelets, and plasma. It has a temperature of approximately 38 degrees Celsius, a pH of 7.4, and a built-in system for clotting.

Whole blood is a complex fluid that contains a variety of cells and proteins necessary for the body's function. The temperature of whole blood is typically maintained at approximately 38 degrees Celsius, which is essential for maintaining proper enzymatic activity and cellular metabolism.

The pH of whole blood is regulated to maintain a slightly basic environment, typically around 7.4. This is crucial for the proper functioning of enzymes, metabolic processes, and cell signaling pathways.

Whole blood also contains a built-in system for clotting, which is essential for preventing excessive bleeding following an injury. This system involves a cascade of enzymatic reactions that ultimately lead to the formation of a blood clot, which helps to prevent further blood loss and promote healing. Overall, the various characteristics of whole blood are essential for maintaining the body's homeostasis and ensuring proper functioning.

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The 0.09 tons or 90kg of carbon will be used in the extraction of 0.8 tons of Fe₂O₃.

Blast furnace metallurgy is the process of extracting iron from iron ore, such as hematite, which contains iron(III) oxide, Fe₂O₃. By removing oxygen from the iron(III) oxide during this reduction event, iron is left behind. Generally used to smelt pig iron, but sometimes other industrial metals like lead or copper, a blast furnace is a type of metallurgical furnace. When combustion air is "forced" or provided above atmospheric pressure, this is referred to as a blast.

2Fe₂O₃ + 3C = 4Fe + 3 CO₂

2×160       3×12    4×56  3×44            (∴1 ton= 1000kg or 1000000g)

The 320 g of hematite ore require carbon = 36g

Then,8×10⁵ g of hematite ore require carbon=9X10⁴  (∵0.8ton= 8x10⁵ g)

The carbon used = 0.09tons  or 90 kg

Hence, 0.09 tons of carbon needed for 0.8 tons hematite extraction.

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Answer:eighter a b or c

nah i am playing it is a

Explanation:

Answer:

A is correct i took the quiz

Explanation:

Answer:

KI 1.0 M

Explanation:

Freezing point of a substance is a colligative property. This means that it depends on the amount of substance present is the system.

The freezing point is given by; T - Ta = K * m * i

Where;

T = freezing point of the pure solution

Ta = freezing point of the solution containing the solute

K = freezing point constant

m = molality of the solution

i= Van't Hoff factor

If we look at all the options provided, KI has only two particles in solution and a molality of 1.0 m hence it should exhibit the lowest freezing point of solution.

Being a weak acid (Ka = 5.6x104), the nitrous acid reacts with NaOH as follows: NaOH (l) + HNO2 = NaNO2 (aq) + H2O.

A 0.15 m naoh solution is used to titrate 100 ml of 0.15 m nitrous acid (HNO2). The pH of the initial solution is 2.04, 3.85 for the equivalence point, 8.06 for the point at which 80.0 ml of the base has been added, and 11.56 for the point at which 105 ml of the base have been added. There is initially simply a 0.12M HNO2 solution. Like Ka is: Ka is equal to [H+] [NO2]/[HNO2]. When the ions [H+] and [NO2] come from the same equilibrium, [H+] = [NO2] = x, 5.6x10⁻⁴ = X² / 0.15M. 8.4x10⁻⁵ = X². X = [H⁺] = 9.165x10⁻³M. Since pH = -log [H+], pH = 2.04.

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The arrows that represent the phase transitions in which heat energy is gained is : (A). 1, 2 and 3

Phase transitions can be defined as the changing of matter from one form to another due to the addition or gaining of heat or due to the removal or loss of heat.

Phase transitions in matter are majorly between three phases which are: Solid, Liquid and Gas.

In conclusion, The arrows that represent the phase transitions in which heat energy is gained is : (A). 1, 2 and 3

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Considering the definition of STP conditions, a mass of 20.10 grams of chlorine gas is found in a 12.7 L sample at STP.

STP conditions refer to standard temperature and pressure, using 1 atmosphere and 0 °C as reference values for gases. Under these conditions, 1 mole of any gas occupies an approximate volume of 22.4 liters.

The molar mass of substance is the amount of mass that a substance contains in one mole.

In this case, you can apply the following rule of three: if by definition of STP conditions 22.4 liters of chlorine is occupied by 1 mole of chlorine, 12.7 liters is occupied by how many moles of chlorine?

moles= (12.7 liters× 1 mole)÷ 22.4 liters

moles= 0.567 moles

The molar mass of chlorine is 35.45 g/mole.

Now,  you can apply the following rule of three: If by definition of molar mass 1 mole of chlorine has a mass of 35.45 grams, 0.567 moles of chlorine has how much mass?

mass= (0.567 moles× 35.45 grams)÷ 1 mole

mass= 20.10 grams

Finally, a mass of 20.10 grams of chlorine gas is present.

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12.308% of the chemical is sulfur. The compound's whole sulfur content is transformed into barium sulfate. Therefore, the mass for sulfur from barium sulfate will match the mass for sulfur in the compound.

People are not highly poisonous to sulfur. However, consuming far to much sulfur may result in diarrhea or a burning feeling. Sulfur dust inhalation might irritate the airway or make one cough. The eyes and skin may also become irritated by it.

Sulfur can indeed be found in sulfide ores and in nature. It is native to areas close to volcanoes and hot springs. The tenth most common element, sulfur, is found in almost all types of plant and animal life, meteorites, ocean ocean, the humankind's crust, and or the atmosphere.

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Answer:

Molecular mass of NH3 = ( 14 + 3 ) = 17 g

\(PV = \frac{m}{m _{r}} RT \\ P \times 50.0 \times {10}^{ - 6} = \frac{68.0}{17} \times 8.314 \times (30.0 + 273) \\ P = \frac{68.0 \times 8.314 \times 303}{17 \times 50.0 \times {10}^{ - 6} } \\ P = 2.02 \times {10}^{8} \: Pascals\)

The mass of copper produced from the reaction of 357 L of H₂ gas with CuO at STP is 949 g.

Using the ideal gas law equation PV = nRT, Pressure is P, temperature is T, gas constant is R, volume is V and moles are n. From the balanced chemical equation, we know that 1 mole of Cu reacts with 1 mole of H₂.

1. The mass of Cu produced is equal to the number of moles of Cu times its molar mass since copper has a molar mass of 63.55 g/mol. Therefore, the steps to solve the problem are,

Convert the volume to liters,

357 L

Calculate the number of moles of H₂ using the ideal gas law:

PV = nRT

(1 atm) (357 L) = n (0.0821 L·atm/mol·K) (273 K)

n = 14.94 mol

2. Calculate the number of moles of Cu based on the balanced chemical equation,

1 mole Cu : 1 mole H₂

14.94 mol H₂ : x mole Cu

x = 14.94 mol

3. Calculate the mass of Cu produced:

m = n × M, mass in grams is m, the number of moles is n, the molar mass of Cu is M.

M(Cu) = 63.55 g/mol

m = 14.94 mol × 63.55 g/mol

m = 949 g

Therefore, the mass of copper produced is 949 g.

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Answer:

you're going to start by balancing the carbon first. To do this, you want to times the carbon on the right by 4 so we put a 4 in front of the CO2.C4H8 + O2 --> 4CO2 + H2OWe're now going to try and balance the hydrogen by putting a 4 in front of the H2O.C4H8 + O2 --> 4CO2 +4H2OThen we're going to count the oxygens on both side and balance them by putting a 6 in front of the O2.C4H8 + 6O2 --> 4CO2 + 4H2O

Answer:

hope this helps :) please correct me if I'm wrong.

C4H8 + 6O2 --> 4CO2 + 4H2O.

Explanation:

C4H8 + O2 --> CO2 + H2O

C=4 C=1

H=8 H=1

O=2 ---> O=3

C4H8 + 6O2 --> 4CO2 + 4H2O

C=4 C=4

H=8 H=8

O=12 ---> O=12

The elements that have the same number of valence electrons are silicon and carbon. The answer is option C and D. An element is a pure substance that cannot be separated into any simpler substances by chemical means. The periodic table is made up of elements.

These are some of the characteristics of an element: All atoms of an element have the same number of protons in their nucleus, which is the atomic number. The majority of an element's properties are determined by the number of electrons in its outermost shell. This is also referred to as the valence shell. Silicon and carbon both have four valence electrons. They both belong to Group 14, which is also known as the Carbon Group, on the periodic table, which includes elements with four valence electrons. Therefore, Silicon and Carbon both have the same number of valence electrons. The answer is option C and D

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The partial pressure of CH4 in the mixture is 239 torr.

To find the partial pressure of CH4 in the mixture, we need to use the mole fraction of CH4.

First, we need to find the moles of each component in the mixture. The molar mass of CH4 is 16.04 g/mol, so:

moles of CH4 = 90.0 g / 16.04 g/mol = 5.61 mol

The molar mass of Ar is 39.95 g/mol, so:

moles of Ar = 10.0 g / 39.95 g/mol = 0.250 mol

The total number of moles in the mixture is:

total moles = moles of CH4 + moles of Ar = 5.61 mol + 0.250 mol = 5.86 mol

Now we can find the mole fraction of CH4:

mole fraction of CH4 = moles of CH4 / total moles = 5.61 mol / 5.86 mol = 0.957

Finally, we can use the mole fraction to find the partial pressure of CH4 using Dalton's Law of Partial Pressures:

partial pressure of CH4 = mole fraction of CH4 x total pressure

partial pressure of CH4 = 0.957 x 250 torr = 239 torr

Therefore, the partial pressure of CH4 in the mixture is 239 torr.

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Answer:

The electronic configuration of ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Explanation:

Lithium metal, Li will lose 1 electron to lithium ion Li+. Chlorine atom, Cl will receive the 1 electron to form the chloride ion Cl- as shown by the following equation below:

Li —> Li+ + e

Cl+ e —> Cl-

Combine both equation

Li + Cl + e —> Li+ + Cl- + e

Cancel out 'e'

Li + Cl —> Li+ Cl-

Thus, we can write the electronic configuration for the reaction as follow:

Before reaction:

Li (3) => 1s2 2s1

Cl (17) => 1s2 2s2 2p6 3s2 3p5

After reaction

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6

Therefore, the electronic configuration of the ions formed are:

Li+ (2) => 1s2

Cl- (18) => 1s2 2s2 2p6 3s2 3p6