A sample of pure lithium nitrate contains 10.1% lithium by mass. What is the % lithium by mass in a sample of pure lithium carbonate that has twice the mass of the frost sample?

Answer:

It is a Mixture

Explanation:

It's a mixture because it was a substance made from mixing other substances together. And when the magnet went over the powder, the iron  is lifted and not the sulfur. So the different parts of it can be separated by any physical means that allows the parts to seen separated

Answer:

its is a mixture

Explanation: because I did the question

Answer:

b

Explanation:

they have coal mines that go down deep into the earth but they also have mines called strip pits where they dig down and create a large creator in the earth insted of a mine shaft

Answer:

the product of q in the reaction below is Nacl

The joint in the human body which is similar to the chicken wing joint is referred to as the elbow joint.

This is referred to as a point where two or more bones meet and are usually lined with cartilages so as to reduce the effect of friction as it causes wear and tear of the skeletal structures which are important for our movement.

The chicken has a structure called wing as its hands which is therefore the reason why it is similar to that of the elbow joint in humans and makes it the correct choice.

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One of the antipsychotic drugs that appears to work at serotonin receptors is Clozapine. Clozapine is a medication used to treat schizophrenia.

It is effective in reducing symptoms of agitation, aggression, hallucinations, and delusions in people with schizophrenia. Unlike most other antipsychotic medications, clozapine works on both dopamine and serotonin receptors in the brain. This drug is called an atypical antipsychotic, meaning it is less likely to cause the movement disorders associated with traditional antipsychotics like haloperidol.

Clozapine binds strongly to the serotonin 5-HT2A receptor, which is believed to be responsible for its efficacy in treating schizophrenia. In addition, it is also a potent antagonist at the D1, D2, D3, D4, and D5 dopamine receptors. This is the reason why it has such a broad therapeutic effect on schizophrenia. In summary, clozapine appears to work at serotonin receptors.

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The HCN that is the hydrogen cyanide is the polar compound. The molecule of the hydrogen cyanide is not the symmetric.

The Hydrogen cyanide consists of the linear structure. It has the  carbon atom that lies in between the hydrogen and the nitrogen atoms. There are the two polar bonds present in the hydrogen cyanide. The Hydrogen cyanide is the  polar compound. The molecule is not the symmetric. The nitrogen atom and the hydrogen atom have the different electronegativities, that will create the uneven pull on the electrons. Therefore there is a net dipole moment.

Thus, The HCN is the polar compound.

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Answer:

\(T1=166.66K\)

Explanation:

According to Gay-Lussac’s law simply states that the ratio of the initial pressure and temperature is equal to the ratio of the final pressure and temperature for a gas of a fixed provided that the mass is kept at a constant volume.

Given:

Initial pressure, P1 = 1 atm

Final pressure, P2 = 1.5 atm

Final temperature, T2 = 250 K

The law can be applied using the below formula

P1T2 = P2T1

Then,

T1 = (P1T2)/P1 = (1*250)/(1.5) = 166.66 Kelvin.

\(T1=166.66K\)

:

Answer:

\(T_1=166.7K\)

Explanation:

Hello,

In this case, by applying the Gay-Lussac's law which help us to understand the pressure-temperature gas behavior via a directly proportional relationship:

\(\frac{P_1}{T_1} =\frac{P_2}{T_2}\)

In such a way, as we are asked to compute the initial temperature knowing the initial pressure and final both temperature and pressure, so we solve for it:

\(T_1=\frac{T_2P_1}{P_2}=\frac{250K*1atm}{1.5atm} \\\\T_1=166.7K\)

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Answer:The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotope).

Explanation:try to find what i ment and  think you will get the answer

Answer:

I think the answer is b or d

Explanation:

I THINK IS THE KEY WORD HERE

Based on the information provided, a Mann-Whitney U test would be the appropriate reactant statistical test to compare the two groups.

The Mann-Whitney U test is a non-parametric test that does not rely on the assumption of normality and is suitable for comparing two independent groups with continuous or ordinal data. In this case, the data does not follow a normal distribution as evidenced by the large differences in standard deviations and variances between the two groups.

The Mann-Whitney U test is a non-parametric test that compares the medians of two independent groups without assuming normal distribution. This test is suitable when the data is not normally distributed and the variances between the two groups are significantly different, as in your case.
1. Verify that the data is non-normal and has unequal variances.
2. Choose the Mann-Whitney U test as the appropriate statistical test.
3. Calculate the U statistic and compare it to the critical value.
4. Obtain the p-value and determine if there is a significant difference between the two groups based on the chosen significance level.

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The correct answer is cerium 141,911amu.

A unit atomic mass is defined as one-twelfth of the mass of a single carbon-12 atom. The atomic mass of an element is the atomic mass. Average atomic mass is the weighted average of the atomic masses of all isotopes of that element.

To answer this question, a formula is written to calculate the average atomic mass of cerium. (135.90714 amu × 0.0019 )+ ( 137.90599 amu × 0.0025 )+ ( 139.90543 amu * 0.8843 )+(Ce−142 × 0.1113)

= 140.116

Solving the equation for Ce-142 gives an atomic weight of 141.911 amu.

The correct answer is 141,911 amu. 

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Answer:

One change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.

The biggest example is Pressure.

\(\\ \rm\longmapsto Pressure=\dfrac{Force}{Area}\)

\(\\ \rm\longmapsto Pressure\propto \dfrac{1}{Area}\)

The final equation is obtained by reversing equation 2 and multiplying it by 1/2. Thus, option A and C are correct.

The given equations are:

\(\rm Ca\;+\;CO_2\;+\;1/2\;O_2\;\rightarrow\;CaCO_3\)

\(\rm 2\;Ca\;+\;O_2\;\rightarrow\;2\;CaO\)

The final equation to be obtained are:

\(\rm CaO\;+\;CO_2\;\rightarrow\;CaCO_3\)

The final reaction is obtained with the CaO as the product. The CaO as product is obtained by reversing equation 2.

The half of equation 2 will give the final equation.

Thus, the final equation is obtained by reversing equation 2 and multiplying it by 1/2. Thus, option A and C are correct.

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The  substance that is the limiting reagent is AlCl3(aq).

The limiting reagent in a chemical reaction is described as a reactant that is totally consumed when the chemical reaction is completed.

This limiting reagent generally determines when the reaction will stop.

The exact amount of reactant which will be needed to react with another element can be calculated from the reaction stoichiometry.

The limiting reagent also is not dependent on the masses of the reactants  but on mole ratio present.

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25 meters/second west is a speed quantity. 25 seconds is a time quantity. 25 km up is a distance quantity. 25 meters/second is a speed quantity. Therefore, options c, e, a and c are the correct options.

Speed is a unit used to describe how swiftly something moves in a certain direction. The distance travelled per unit of time is a scalar quantity that characterises the rate of motion. In the International System of Units (SI), metres per second (m/s) is the accepted unit for measuring speed. Speed does not define the direction of the motion; it merely reveals its magnitude. Velocity, a vector variable that combines both magnitude (speed) and direction, is the term used to define motion that is described in a particular direction.

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The oxidation number of an element in a compound is equal to the charge of the atoms if the compound was an ionic compound.

The types of compounds are:

Ionic compounds:

Covalent compound:

Molecular compounds:

Therefore, the oxidation number of an element in a compound is equal to the charge of the ion that would have if the compound was an ionic compound.

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Vapor pressure of a liquid increases with increasing temperature because increasing the temperature results in increasing kinetic energy and increase in molecular transition and motion.

What is Vapor Pressure?

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Answer:

Explanation:

Mide 2mL de etanol, añadelo a un matraz aforado, pon agua hasta llegar a 100mL

The chemical formula for the ionic compound formed by Ca2+ and Br− is CaBr₂.

Ca⁺² is the calcium ion, which has a 2+ charge due to losing two electrons. Br− is the bromide ion, which has a 1− charge because it gained one electron. In order to form a stable ionic compound, the charges of the ions must balance each other.

Since Ca⁺² has a 2+ charge and Br− has a 1− charge, we need two bromide ions to balance the charge of one calcium ion. This is because the positive charge of the calcium ion must equal the sum of the negative charges of the bromide ions.

To represent the ratio of ions in the compound, we write the chemical formula as CaBr₂. The subscript 2 indicates that there are two bromide ions for every one calcium ion.

The chemical formula for the ionic compound formed by Ca⁺² and Br− is CaBr₂. This indicates that two bromide ions are needed to balance the charge of one calcium ion.

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Answer:

NaCl contains 12.046 x 1023 ions.

Explanation:

:p

When propanal reacts with methylmagnesium bromide (CH3MgBr) followed by the addition of dilute acid, the major organic product formed is 3-hydroxypropan-1-ol (also known as 1-propanol). This reaction is an example of an addition reaction.

For 2-pentanone, the major organic product formed is 2-pentanol. The methyl group from CH3MgBr adds to the carbonyl carbon of 2-pentanone, resulting in the formation of an intermediate. The intermediate is then protonated by the dilute acid, leading to the formation of the alcohol.

In both cases, the addition of CH3MgBr followed by the addition of dilute acid results in the conversion of the carbonyl group into a hydroxyl group, forming alcohols as the major organic products.

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Answer: An acid is defined with having more [H₃O+] ions, and a base is defined with having more [OH-] ions. On the pH scale, an acid has a lower pH and a base has a higher pH. With this being said, the lower the pH, the more [H₃O+] ions are present and the higher the pH, the more [OH-] ions are present.

Explanation:

I hope this helps!! Pls give brainliest!! :)

Given that the volume of the pure water is 480 mL and the mole of HCl added to the water is 2×10¯² mole. Therefore, the Initial and final pH of the water are:

1. The initial pH of the pure water is 7

2. The final pH of the water is 1.38

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

Molarity = mole / Volume

Molarity = 2×10¯² / 0.48

Molarity = 4.17×10¯² M

HCl(aq) —> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

4.17×10¯² M HCl will also contain 4.17×10¯² M H⁺

pH = –Log H⁺

pH = –Log 4.17×10¯²

pH = 1.38

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Eosin-Methylene Blue agar (EMBA) is a selective and differential medium. Based on the information that it contains peptone, lactose, sucrose, potassium phosphate, and the dyes for which it is made.

EMBA is a selective medium because it contains the dyes eosin and methylene blue, which inhibit the growth of Gram-positive bacteria, allowing only the growth of Gram-negative bacteria.

It is also a differential medium because it contains lactose and sucrose, which allows for the differentiation of bacteria based on their ability to ferment these sugars.

Bacteria that can ferment lactose or sucrose will produce a change in the color of the medium, making it easy to distinguish between fermenting and non-fermenting colonies.
Based on the information provided, EMBA is a selective and differential medium, used for the isolation and differentiation of Gram-negative bacteria based on their ability to ferment lactose and sucrose.

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The mass (in grams) of ammonia, NH₃ needed to make 1.25 L solution with a pH of 11.68 is 0.102 grams

First, we shall determine the hydroxide ion concentration in the solution. Details below:

pH of a solution is given by the following formula:

pOH = -Log  [OH⁻]

Inputting the various parameters, we have

2.32 = -Log  [OH⁻]

Multiply through by -1

-2.32 = Log [OH⁻]

Take the anti-log of -2.32

[OH⁻] = Anti-log -2.32

[OH⁻] = 0.0048 M

Next, we shall determine the molarity of the ammonia. Details below:

NH₃(aq) + H₂O <=> NH₄⁺(aq) + OH⁻(aq)

From the above equation,

1 mole of OH⁻ is present in 1 mole of NH₃

Therefore,

0.0048 M OH⁻ will also be present in 0.0048 M NH₃

Next, we shall determine the mole of ammonia. Details below:

Molarity = Mole / Volume

Cross multiply

Mole of ammonia = molarity × volume

Mole of ammonia = 0.0048 × 1.25

Mole of ammonia = 0.006 mole

Finally, we shall determine the mass of ammonia needed. Details below:

Mass = Mole × molar mass

Mass of ammonia = 0.006 × 17

Mass of ammonia = 0.102 grams

Therefore, the mass of ammonia needed is 0.102 grams

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