While performing a neutralization reaction, Jonna added 28.37 mL of 0.142 M H2SO4 to 43.15 mL of 0.334 M KOH. What concentration of OH-, in M, that is unreacted in the solution after the neutralization is complete

Answer:

Reducing sugars are absent

Explanation:

Benedict's solution is an substance used in testing sugars. It is mixture of sodium carbonate, sodium citrate and copper(II) sulfate pentahydrate. It can be used instead of Fehling's solution in testing for the presence of reducing sugars.

Reducing sugars contain the -CHO group. If there is no colour change after the addition of Benedict's solution, then we can conclude that reducing sugars are absent.

Answer:I think it’s y sorry if I’m wrong

Explanation:

Answer:

i think it might be y

Explanation:

Answer:

0.03943946590515751

Explanation:

Answer:

0.03944 mol HCl

Explanation:

Step 1: Define

Molar Mass of H - 1.01 g/mol

Molar Mass of Cl - 35.45 g/mol

Molar Mass of HCl - 36.46 g/mol

Step 2: Use Dimensional Analysis

\(1.438 \hspace{3} g \hspace{3} HCl(\frac{1 \hspace{3} mol \hspace{3} HCl}{36.46 \hspace{3} g \hspace{3} HCl} )\) = 0.03944 mol HCl

Answer:

One mole of any substance contains 6.022*1023 structural units (atoms, molecules, ions, etc.). This number is known as the Avogadro constant.

One mole of any substance contains 6.022*1023 structural units (atoms, molecules, ions, etc.). This number is known as the Avogadro constant.So 1.04*107 mol of Al contains 1.40*107 * 6.022*1023 = 8.43*1030 structural units (in case of Al – atoms).

Explanation:

When considering the length of sunshine and nighttime in various seasons, the Southern Hemisphere is experiencing winter.

The seasons are caused by Earth's tilted axis. Several regions of the Earth are exposed to the Sun's strongest rays at various times of the year. So, the Northern Hemisphere experiences summer when the North Pole tilts towards the Sun. Moreover, winter in the Northern Hemisphere occurs when the South Pole tilts towards the Sun.

Australia's seasons are the opposite of those in the northern hemisphere. The winter season runs from June to August, the spring season from September to November, and the summer season runs from December to February.

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Approximately 7.09 kJ of heat is required to vaporize 14.0 g of ammonia.

The heat of vaporization for ammonia, NH3, is 8.65 kJ/mol. To calculate how much heat is required to vaporize 14.0 g of ammonia, we can follow these steps:
1. Convert the given mass of ammonia from grams to moles. We can use the molar mass of ammonia to do this. The molar mass of NH3 is approximately 17.03 g/mol. Dividing 14.0 g by 17.03 g/mol gives us 0.82 mol.

2. Now, we can use the heat of vaporization to find the amount of heat required. The heat of vaporization is given as 8.65 kJ/mol. Multiplying this value by the number of moles of ammonia (0.82 mol) gives us the amount of heat required.
  8.65 kJ/mol * 0.82 mol = 7.09 kJ
Therefore, approximately 7.09 kJ of heat is required to vaporize 14.0 g of ammonia.

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Explanation:

We are given: concentration of a weak acid = 10^-4 M

Answer:

The pH of a weak acid is 4.

Having a half-life of 61 days, iodine-125 would take 122 days for a 0.25 g of iodine-125 to remain from 1.00 g of it.

Half-life, an aspect of radioactive decay, is defined as the amount time it takes a radioactive isotope to disintegrate by a half. The formula for half-life is given by:

N(t) =N(0) 1/2 ^ t/t(1/2)

where N(t) = amount of substance remaining

N(0) = initial amount of substance

t = elapsed time

t(1/2) = half-life of the substance

Using this formula where N(t) = 0.25 g, N(0) = 1.00 g, and t(1/2) = 61 days,

N(t) =N(0) 1/2 ^ t/t(1/2)

0.25 g = 1.00 g x (1/2)^t/61

(1/2)^t/61 = 1/4

t = 122 days

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We plot the cups of coffee drink on the X-axis, whereas hours of sleep are plotted on the Y-axis.

plotting graphs  relationship between various sets of variables with respect to one another. the main use of a graph is  it helps us to  present data which are complex to describe in the text.Since in the problem it is given that, the student wants to record the hours of sleep which are affected by the number of cups of coffee consumed by her or  him, therefore we will plot the number of cups of coffee on the X-axis and the number of hours of sleep will be plotted in  Y-axis .

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Answer:

nucleus

Explanation:

An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.

hope that helps!

Answer:

(1) See below, (2) About 8.4 pH, (3) About 3.981 * 10⁻⁶ mol dm⁻³

Explanation:

1. A buffer is a solution that resist pH when adding a basic or acidic compound. It's purpose is to neutralize added acids and bases.

2. Remember that the formula for pH is -log [H+]. We have a 0.1 M solution of baking soda in water with [H+] of about 4.0 × 10⁻⁹. Therefore we can calculate the pH as follows...

pH = -log (4.0 × 10⁻⁹)

pH = -(-8.39794...) = (About) 8.4 pH of 0.1 M of baking soda

3. This question has a similar set up...

pH = -log [H+]

[H+] = inverse of log^- pH

[H+] = 10^-5.4 = (About) 3.981 \(*\) 10⁻⁶

Answer:

expande

forman se alejan

Explanation:

Según las leyes de los gases ideales;

La ley de Charles establece que el volumen de una masa dada de gas ideal es directamente proporcional a su temperatura a la presión simultánea.

Esto significa que cuando se calienta una masa dada de gas ideal, el gas se expande y las moléculas de gas se alejan unas de otras de acuerdo con la ley de Charles.

Answer:

11.01

Explanation:

because yes :)

Answer:

second one is better

Explanation:

system is very much hot in first state..so wait for cooling down the system..but these depend on the organic compounds and products you are using. sometimes we need to carryout further steps in hot state..then you can't wail it to cool down

Answer:

Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.

Answer:

Chemical reactions that absorb (or use) energy overall are called endothermic. In endothermic reactions, more energy is absorbed when the bonds in the reactants are broken than is released when new bonds are formed in the products.

Answer: Sodium Hydroxide (NaOH)

Explanation: Sodium Hydroxide also known as Cautious Soda is a compound comprising of Sodium cations and Hydroxide anions.

It is white and in form of opaque crystals.

It is anhydrous and completely soluble in water.

It is also a Hygroscopic compound which explains its absorption of water from the air.

Sodium Hydroxide is also formed by a chlor alkali process which is an industrial processes used for the electrolysis of sodium chloride solutions.

This process produces sodium hydroxide and chlorine.

See simple equation below;

2NaCl + H2O ---> 2NaOH + Cl2

Clouds form behind a cold front and ahead of a warm front because of the difference in temperature and moisture between the two air masses.

When a cold front, which is an area of colder air, meets a warm front, which is an area of warmer air, the colder air forces the warmer air to rise. As the warmer air rises, it cools and the moisture in the air condenses to form clouds. This process is called adiabatic cooling.

Similarly, when a warm front meets a cold front, the warmer air rises over the colder air and cools, forming clouds. However, because the warm air is less dense than the cold air, it rises more slowly and the clouds that form are typically less dense and less likely to produce precipitation.

In both cases, the difference in temperature and moisture between the two air masses leads to the formation of clouds. This is why we often see clouds forming behind a cold front and ahead of a warm front.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 2 × 2

We have the final answer as

Hope this helps you

An isochron represents the age of a rock, given the composition of minerals. In geochronology, isochron dating is a technique used to determine the age of rocks or geological samples.

Isochron dating relies on analyzing the ratios of isotopes within the minerals present in the rock. Isotopes are variants of an element with different numbers of neutrons in their atomic nuclei. By measuring the isotopic ratios, specifically the parent and daughter isotopes, scientists can calculate the time elapsed since certain geological events, such as the crystallization of the rock or a metamorphic event.

The isochron method involves plotting the isotopic ratios on a graph, typically using a set of minerals from the same rock sample. If the minerals formed at the same time, the data points will fall along a straight line known as an isochron. The slope of the isochron line provides the age of the rock, while the intercept with the y-axis indicates the initial isotopic composition. This technique helps to overcome challenges such as the presence of inherited isotopes or disturbances in the isotopic system, providing a reliable estimate of the rock's age.

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The structure that best fits the given data is 1,4-dibromobenzene.

The presence of two methyl singlets in the proton NMR spectrum indicates the presence of two methyl groups in the compound. This suggests the presence of a substituent attached to the benzene ring.

The proton-decoupled 13C NMR spectrum displays six peaks, indicating the presence of six distinct carbon environments. In 1,4-dibromobenzene, there are two carbon atoms attached to the methyl groups, which gives two peaks. The benzene ring itself has four unique carbon environments, each with a different chemical shift, resulting in four additional peaks.

The structure of 1,4-dibromobenzene matches the data because it contains two methyl groups and displays a total of six peaks in the proton-decoupled 13C NMR spectrum, consistent with the given information.

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In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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The gas, having a higher pressure among the two is the gas with greater number of moles which is He(Helium).

The pressure of gas is directly Proportional to the number of moles in the gas... So first of all counting the Number of moles in both the cases:

Number of Moles of He : 5g * \(\frac{1 Mole}{4.00 g}\) = 1.25 moles

Number of moles of O2 : 5g * \(\frac{1 mole}{32 g}\) = 0.156 moles

Since the number of moles of He is greater than the number of moles of O2, the He will exert more pressure on the container.

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A sample of vitamin a, C20H30O, contains 4.0 x 1024 atoms of carbon. It represents 6.64 mol of vitamin.

A mole is defined as the quantity of a material that contains precisely the Avogadro number of the substance's "elementary entities."  

Every material has the same amount of atoms or other particles in a mole. The mole has the following relationship to an element's mass: One mole of carbon-12 atoms weighs 12 grams and has 6.02214076 x 10^23 atoms.The mole concept helps in putting quantitative data about what transpires in a chemical equation on a macroscopic scale.

Number of carbon atoms in the given sample = 4 x 10^24 atoms.

We know that 6.022 x 10^23 carbon atoms = 1 mole (avagardo constant)

So, moles in 4 x 10^24 carbon atoms will be = 4 x 10^24/ 6.022 x 10^23

      =  6.64 mol.

Therefore, no of moles present is 6.64 mol.

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Answer:

Explanation:

The first thing to do is to write out the chemical equation showing the reaction between the two chemical compounds.

C2H4 + HBr ------------------------> C2H5Br.

The chemical species/compounds reacted in the ratio of 1 : 1 : 1. That is one mole of C2H4 reacted with one mole of HBr to give one mole of C2H5Br.

So, we are given; C2H5Br = 58.7 mol%, HBr = 18.3 mol%. Thus, for C2H4, we have [ 100 - (58.7 + 18.3)] = 23 mol%. Therefore, the limiting reagent is HBr.

So, if we have 100 mol/s ;

C2H5Br = 100 × 0.587 = 58.7 mol/s, HBr = 100 × 0.183 = 18.3 mol/s and C2H4 = 100 × 0.23 = 23 mol/s.

Therefore, the total value of the flow rate in the feed = (HBr in feed) mol/s + (C2H4 in feed) mol/s = (58.7 + 18.3)mol/s + (58.7 + 23) mol/s =( 77 + 81.7) mol/s = 158.7 mol/s. .

So, 100/158.7 × 30.5 = 192.2.

Also the feed composition in HBr and C2H4 is;

HBr = 77/158.7 = 0.4852, C2H4 = 81.7/158.7 = 0.515.

Therefore, the number of HBr in feed and C2H4 in feed = 160m/s and 200m/s respectively (approx.)

Therefore, the fraction conversion is;

Hydrogen gas is released when sodium metal interacts strongly with water to generate NaOH. Assume the final solution volume is 1.00 L and 10.0 g of Na fully reacts with 1.00 L of water.

a) molar mass of NaOH=39.9g/mol

b) 2 Na ( s ) + 2 H\(_2\)O ( l ) → 2 NaOH ( aq ) + H\(_2\) ( g )

c)  0.045M is the molarity

The link between mass and substance quantity (measured in moles) in any sample of a chemical compound is known as the molar mass (M) in chemistry. A material's molar mass is a bulk characteristic rather than a molecular one. The compound's molar mass is an average of many samples, several of which have varying masses due to isotopes.  A terrestrial average or a function of the proportional abundance and the isotopes of the component atoms on Earth.

2 Na ( s ) + 2 H\(_2\)O ( l ) → 2 NaOH ( aq ) + H\(_2\) ( g )

molar mass of NaOH=39.9g/mol

moles of Na = 10/22=0.45

moles of NaOH = 0.45

volume of solution = 0.45×22.4=10.0L

Molarity = number of mole/volume of solution

             =  0.45/10.0L

              = 0.045M

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