Methane (CH4), is said to be the cleanest burning fossil fuel. When burned, it releases carbon dioxide gas and forms water. Using the equation below, determine which of the following is true (assuming there is an infinite supply of oxygen gas (O2)). Select all that apply.

For every 1 molecule of methane CH4 that reacts, 2 molecules of H2O are produced.


For every 2 moles of methane (CH4) that reacts, 2 moles of H2O are produced.


For every 2,000 molecules of methane (CH4) that reacts, 2,000 molecules of H2O are produced.


For every 20 grams of methane (CH4) that reacts, 40 grams of H2O are produced.


For every 200 moles of methane (CH4) that reacts, 400 moles of H2O are produced.

The purpose of adjusting the vacuum in an Up in Smoke Lab is to control the pressure within a closed system, typically a distillation setup, in order to perform efficient separations of the components in a mixture based on their boiling points.

A vacuum pump is used to reduce the pressure in the system, allowing the components with lower boiling points to boil at lower temperatures, thereby facilitating their separation from those with higher boiling points. By controlling the vacuum, the lab can precisely adjust the conditions under which the separation takes place, leading to more accurate and reproducible results.

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Answer:

0.14 liters nitric acid

Explanation:

Molarity = moles / liter

7.0 M = x / 0.03 L

= 0.21 moles NaOH

0.21 moles NaOH x ( 1 mole HNO3 / 1 mole NaOH) = 0.21 moles HNO3

Molarity = moles / liter

1.5 M  = 0.21 moles / x

x = 0.21 moles / 1.5 M

x = 0.14 Liters HNO3

Answer:

\(140mL\)

Explanation:

\(M_1V_1=M_2V_2\)

\(M_1=1.5M\) molarity of nitric acid

\(V_1=?\)  volume of nitric acid

\(M_2=7.0M\) molarity of sodium hydroxide

\(V_2=30.0mL\) volume of sodium hydroxide

\((1.5M)(V_1)=(7.0M)(30.0mL)\)

\(V_1 =\frac{(7.0M)(30.0mL)}{1.5M}=140mL\)

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Answer:

answer is 2 ............

The temperature of the gas is 285 K

Boyle's law is a fundamental law of physics that describes the relationship between the pressure and volume of a gas at constant temperature. The law states that the pressure of a gas is inversely proportional to its volume, such that if the volume of a gas increases, its pressure decreases, and vice versa. Mathematically, this relationship is expressed as:

P * V = k (constant)

P1V1/T1 = P2V2/T1

P1V1T2 = P2V2T1

T2 = P2V2T1/P1V1

T2 =  675 * 940 * 273/760 * 800

T2 = 285 K

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The ideal gas law, PV = nRT. Nevertheless, we must first count the moles of neon that are in the cylinder. By dividing the mass of neon by its molar mass,  the temperature of the neon gas is 73.35 °C.

n = m/M = 725 g / 20.2 g/mol = 35.89 mol

we can use the ideal gas law to solve for the temperature:

PV = nRT

225 atm = 225 atm / 1 = 225.0 atm

Substituting the values into the equation and solving for T, we get:

T = PV/nR = (225.0 atm) x (4.5 L) / (35.89 mol x 0.0821 L·atm·mol⁻¹·K⁻¹)

T = 346.5 K

To convert from Kelvin to Celsius, we subtract 273.15:

T = 346.5 K - 273.15 = 73.35 °C

In place of it, we have one atmosphere. Divide the 100 M. L. final volume by the 225 M. L. initial volume of time. Four are present. 0.25 atmospheres is the final pressure.

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The equivalent dose that the patient receives is 0.1 Sv.

To calculate the equivalent dose, we need to multiply the dose rate (10 mGy·h^(-1)) by the quality factor (20) and the exposure time (30 minutes).

First, we need to convert the dose rate from mGy·h^(-1) to Gy·h^(-1). Since 1 Gy = 1000 mGy, the dose rate becomes 0.01 Gy·h^(-1).

Next, we convert the exposure time from minutes to hours. There are 60 minutes in an hour, so the exposure time is 30 minutes ÷ 60 = 0.5 hours.

Now, we can calculate the equivalent dose:

Equivalent dose = Dose rate × Quality factor × Exposure time

               = 0.01 Gy·h^(-1) × 20 × 0.5 hours

               = 0.1 Sv

Therefore, the equivalent dose that the patient receives is 0.1 Sv.

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Answer:

Many emerging diseases arise when infectious agents in animals are passed to humans (referred to as zoonoses). As the human population expands in number and into new geographical regions, the possibility that humans will come into close contact with animal species that are potential hosts of an infectious agent increases.

Explanation:

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 54 g

volume = 20 cm³

Substitute the values into the above formula and solve for the density

That's

We have the final answer as

Hope this helps you

Seasonal variations in CO2 recorded at Mauna Loa Observatory are related to the natural cycles of vegetation growth and decay. During the Northern Hemisphere winter months, plants go through a dormant phase, leading to a decrease in photosynthesis and an increase in atmospheric CO2 levels.

In the spring and summer months, plants undergo active growth, which results in increased photosynthesis, and a decrease in atmospheric CO2 levels. This natural cycle is known as the seasonal carbon cycle.

Additionally, the burning of fossil fuels is a significant contributor to the overall increase in atmospheric CO2 levels, which is separate from the seasonal variations. Human activities, such as burning fossil fuels for transportation and energy production, have significantly altered the natural carbon cycle and contribute to the overall increase in CO2 concentrations. However, the seasonal variations at Mauna Loa Observatory are primarily driven by the natural cycle of vegetation growth and decay.

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Answer:

8.5mL

Explanation:

According to the question, a transfer pipette contains 15.23 mL of water. 6.7 mL of water is drawn out of it, this will give :

= 15.23 - 6.7

= 8.53

However, observing the measurements, 15.33mL, which is the initial volume of water in the transfer pipette has 4 significant figures (4 s.f) while the final volume after transference is 6.7 mL, which is in 2 significant figures.

In addition/subtraction, the digit with the lowest number of significant figures will determine the outcome it result.

Hence, 8.53 (3 s.f) will be reported as 8.5 (2 s.f).

Therefore, the final volume is 8.5 mL

Answer:

if its multiple, C and D, if not, C

Explanation:

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One organism was ancestor of the other organism and both organisms lived around the same time is the conclusion made by scientist.

Fossil scientist are the specialists in studying the ancient fossils of animals and plants.

If fossils of two different species of very similar organisms are found in different layers of rock then it might be the possibility that one organism was ancestor of the other or both organisms lived around the same time. Because it is not necessary that if two species had the same organism then they have same behavior.

Hence, option (c) & (d) is correct.

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Answer:

Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. More atmosphere means more molecules to scatter the violet and blue light away from your eyes.

Answer: You can increase the weight, then test the speed, and make the weight normal and test the speed, and mark which one travels faster.

Explanation: This would test your hypothesis by comparing the speeds of the cars when more mass is added. Calculating the difference of the speed with more mass, and the speed with normal mass would give you your answer. A positive number would prove your hypothesis and a negative number would disprove it.

Four ions with the same electronic configuration as neon are, Fluoride ion (F-) with 10 electrons and 9 protons, Sodium ion (Na+) with 10 electrons and 11 protons, Magnesium ion (Mg2+) with 10 electrons and 12 protons, Aluminum ion (Al3+) with 10 electrons and 13 protons.

The electronic configuration of neon is 1s2 2s2 2p6, which means it has 10 electrons in total. The ions listed above have lost electrons to achieve a stable electronic configuration, similar to that of neon. The fluoride ion (F-) has gained one electron to achieve a stable octet, while the sodium ion (Na+), magnesium ion (Mg2+), and aluminum ion (Al3+) have lost one, two, and three electrons, respectively, to achieve the stable electronic configuration of neon.

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7.14 moles of NH₃ are formed in this reaction. This is about the reaction for the generation of ammonia. 2 moles of ammonia are created when 1 mol of nitrogen gas combines with 3 moles of hydrogen.

N₂ + 3H₂ → 2NH₃

In the query, we were instructed that the surplus is the H₂ hence the N₂ is limiting reagent. We identify the moles that have responded as follows:

N2 mass is 101.7 grams.

N2 has a molar mass of 28.0 g/mol.

H2 is excess.

Molar mass of H2 = 2.02 g/mol

NH3 has a molar mass of 17.03 g/mol.

100 g / 28 g/mol = 3.57 moles

Therefore, If 1 mol of nitrogen gas may make 2 moles of ammonia.

3.57 moles of N₂ must produce (2 * 3.57) / 1 = 7.14 moles of NH₃

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The patterns of water use in the USA vary based on different factors such as the geography, climate, and the type of usage

Water usage can cause various problems if not managed properly such as pollution and scarcity.

Some areas in the US have abundant sources of water while others are water-scarce.

Agriculture is the largest water user in the US, followed by municipal and industrial uses. Irrigation is the main water usage in agricultural areas, while urban areas tend to use water for drinking, bathing, and other household purposes.

Excessive water usage can also lead to water scarcity, water pollution, and other environmental problems. Additionally, water usage conflicts can arise between different regions, states, and even countries. Therefore

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Answer:

4 enzymes responsible for digestion:

1. Salivary amylase ---- substrate: Starch ---- end-product: Maltose  

2. Lipase  ---- substrate: Lipids (fats and oils) ---- end-product: Fatty acids and glycerol

3. Maltase ---- substrate: Maltose ---- end-product: Glucose

4. Protease ---- substrate: Protein ---- end-product: Amino acids

Answer:

Single Replacement

Explanation:

im just smart lol

Alkali metals exhibit the lowest first ionization energy.

Alkali metals are a group of elements. Their standard valence shell setup is ns1. Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), Lithium (Li), Hydrogen (H), and Lithium are some of them (Cs).

The alkali metal with the lowest ionization energy is cesium.

Ionization energy is the energy required to remove an electron from a neutral atom or a positive ion. It is a measure of the tendency of an atom or ion to lose an electron and become a cation. The ionization energy is usually expressed in units of electron volts (eV) or kilojoules per mole (kJ/mol). The first ionization energy is the energy required to remove the outermost electron from an atom in its ground state, while the second ionization energy is the energy required to remove the second outermost electron, and so on. Generally, the ionization energy increases as we move across a period in the periodic table, and decreases as we move down a group. This is because as we move across a period, the effective nuclear charge increases, which makes it more difficult to remove an electron from the outermost shell.

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Answer:

3.15×18

56.7

................

Answer: The two categories is porous evidence and nonporous evidence. Nonporous item of evidence is when you put the latent print on the surface and it just sits on the surface. Porous item of evidence is when you put the latent print on the surface and it absorbs the latent print deposit.

Explanation:

1st question answer true

2nd question low resistance

hope it helps

Answer:

\(\large \boxed{\text{D.) 91 kPa}}\)

Explanation:

We can use the Ideal Gas Law — pV = nRT

Data:

V = 15.0 L

n = 0.55 mol

T = 300 K

Calculation:

\(\begin{array}{rcl}pV & =& nRT\\p \times \text{15.0 L} & = & \text{0.55 mol} \times \text{8.31 kPa$\cdot$ L$\cdot$K$^{-1}$mol$^{-1}\times$ 300 K}\\15.0p & = & \text{1370 kPa}\\p & = & \textbf{91 kPa}\end{array}\\\text{The pressure in the container is $\large \boxed{\textbf{91 kPa}}$}\)

Answer:

13.14L

Explanation:

The reaction expression is given as:

      N₂   +   3H₂    →   2NH₃

The given reaction is not balanced and we have balanced it as shown above in the reaction.

       N₂   +   3H₂    →   2NH₃

Based on the Avogadro's law, equal volume of all gases contains the same number of molecules at the same temperature and pressure.

                      1 L of   N₂  will produce  2L of NH₃

So                  6.57L of N₂ will produce 2 x 6.57  = 13.14L of NH₃