How do you prepare a demi-glace?

Answer:

The answer is B.

Explanation:

1 mole of AlCl3 = 27 + 3*35.5 grams = 133.5 grams

1 mole / 133.5 = x / 10         Cross multiply

133.5 x = 1 * 10

x = 10 / 133.5

x = 0.0749 moles

Delta H when written the way it is, is on the left side and since it is negative, the reaction must give away 1390.81 kj. The reaction is exothermic.

So now you get the answer between AB and C by setting up a ratio.

2/0.0749 = -1390.81 / x          Cross multiply

2x = 0.0749 * -1390.81

2x =- 104.18                             Divide both sides by 2

2x//2 = -104.18 / 2

x = -52.09

B

Answer:

8.8 seconds

Explanation:

Formula: acceleration = (v - u) /t where v = final velocity, u = initial velocity and t = time

a = 2.5 m/s²

u = 5.0

v = 27. 0

t =?

at = v - u

t = (v - u) /a

= (27- 5)/ 2.5

= 8.8 s

From the graph shown, Y2 = N2, X2 = O2, Z2 = H2.

When atoms of elements are at a large distance from each other, the potential energy of the system is high. However, as the atoms approach each other, the potential energy of the system decreases steadily. The closer the atoms come to each other, the lower the potential energy. This implies that potential energy is proportional to bond length.

Since N2 has a shorter bond length and higher energy, Y2 must be N2. The bond energy of hydrogen is small hence H2 must be X2. The bond energy of a double bond is intermediate between that of a single and triple bond hence Z2 must be O2.

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Answer:

vinegar and soda

Explanation:

Mixing baking soda (sodium bicarbonate) and vinegar (acetic acid) causes a chemical reaction that produces a salt (sodium acetate) and water, as well as carbon dioxide gas.

Answer:

Fertilizer and vinegar

Explanation:

Fertilizer is a base, and vinegar is an acid. Salt is made when you combine a base and an acid. Plus, I got a 100% on the test and this was my answer.

Answer:

Answer

The limitations are-

1. Privacy of the individuals involved in the research process.

2. Physical and psychological risks should be minimized

3. The subjects should be chosen equitably

4. Only reasonable exposure to risks is admissible.

Explanation

The privacy of the individuals involved in the research must be taken into consideration. This will ensure safety of patient data and information. The risk of physical and physiological well being of the person must be taken into consideration in such a research. In addition to that, the subject must be made to understand every procedure and the risks involved before testing. Moreover, only minimal exposure to risks is allowed and must have been previously tested in animals to avoid deaths.

Answer:

I assume that you mix the 25 mL alcohol with 45 mL water.

The answer depends on a big IF : IF the volumes are additive. Very often volumes of liquids are not additive

Total volume = 70 mL

isopropyl alcohol %(v/v) = 25mL/ 70 mL * 100 % = 35.7% v/v

The answer should have only 2 significant digits: 36%v/v

Explanation:

Hope it helps

The percent by volume  of a solution formed by mixing 25 ml of isopropanol with 45 ml of water is 35.71% which is rounded off to 36%.

Percent volume is defined as the concentration of a particular solute which is measured in terms of volume present in a solution. The volume of the solution is present in the denominator which indicates the total volume of all components .

It is expressed as,

percent volume= volume of solute/volume of solution×100

It is used for solutions which are made by mixing two components . It is one of the ways of expressing concentrations of mixture with a dimensionless quantity.

Percent volume of the given solution is calculated by substituting the given values in the formula like, 25/70×100=35.71%

Thus, the percent by volume concentration of the solution is 35.71%≈36%.

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Answer: Does not change.

Explanation:

The atomic number and the electrical charge of that atom would remain unchanged. Neutrons do not carry an electrical charge so adding or removing them from the nucleus does not change the electrical charge of the nucleus.

Answer:

I can't think of any similarities at all.

Viruses are just an aggregation of genomic material and protein. Occasionally lipid folds around it to make a covering called an envelope.

Fungi are living, eukaryotic cells that metabolize, grow, perform energy conversions and mate with each other.

Answer:

WHAT DID YOU INCLUDE IN YOUR RESPONSE

Answer:

H2SO4

Explanation:

because it's not more acidic

         Both sulfuric acid and hydrochloric acid are potent acids, but hydrochloric acid is stronger. Because HCl is monoprotic and H2SO4 is diprotic, they differ mostly in their acid types.

     Instead of using hydrochloric acid, sulphuric acid (H 2 SO 4) is preferred because: This acid is commonly utilized for a variety of neutralization reactions. Sulphuric acid is more potent than all other acids and is also simpler and safer to use. Even if there is a risk for negative reactions, they are uncommon.

      The majority of the time because it is for a redox reaction or titration in which HCl would react to produce chlorine on its own. You could use phosphoric or sulfuric acid.

       In this situation, H 2 SO 4 is preferable to HCl. Due to the considerable acidity of H 2 SO 4, the solution is made to be more acidic than HCl. As a result, the findings of titration using H 2 SO 4 are more precise. H 2 SO4 generates two hydronium ions, whereas HCl only generates one.

         It shows how many protons split apart to create hydronium ions. The acid will be more potent the lower the pKa value. Therefore, we can conclude that HCl is more acidic than H2S O 4.

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The characteristic of reactions that depends on valence electrons is the bond type.

In chemistry, a chemical bond could be;

The type of bond formed depends on the number of valence electrons present. When there are few valence electrons on an atom, it mostly forms ionic bonds.

When there are more electrons on an atoms, it mostly forms covalent bonds and the electrons between the atoms are shared.

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Answer:

D: bond number

Answer:

ttyhjj

Explanation:

Answer:

A i think. Good luck!!!!

Answer:

50Pa

Explanation:

pressure= force/area

= 500N/10m2

= 50Pa

Answer:

Incomplete combustion produces carbon monoxide along with some carbon dioxide.  Water is always produced during combustion.  If the fuel is sulfur containing, carbon disulfide will result as well.

Have a happy day! <3Miss Hawaii

Explanation:

Fat is a energy giving , protective food

hope it helps

I give my best answer almost

Explanation:

9) a) (9.84×10³)/(6.12×4.27×10³+⁷) = 9.84×10³/6.12×4.27×10¹⁰ = 9.84×10³-¹⁰/6.12×4.27

= 0.376×10^-7.

b) (4.36×10⁸×1.82×10³)/(0.0856×4.7×10⁶)

= (7.9352×10⁸+³)/(0.40232×10⁶)

= 19.72×10⁸+³-⁶ = 19.72×10⁵

hope this helps you.

Atoms are conversed in a Chemical reaction.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances. In chemical reaction matter cannot be created or destroyed.  It is called the law of conservation of mass.

Thus from the above conclusion we can say that Atoms are conversed in a Chemical reaction.

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Answer:

Explanation:

The biggest change in the body caused by regular exercise is to muscle tissue. ... At the cellular level, exercise triggers the release of substances that dilate the blood vessels in the muscle, letting in more oxygen, says Prof Bradford. These are short-term effects, but deeper changes come with regular exercise.

Exercising causes changes in our body because we're working our muscles so there's more going on with us compared to when we're just laying down. We need more oxygen to go to our muscles so we breathe harder and more rapidly. Our heart also beats faster because it needs to pump more blood to the muscles that are being worked.

Answer:

iuiwusiwuiqihihiuwusbhwubduywbduywbudb me no esspanlo

Explanation:

niuniniuniuniun

Answer:

This is not chemistry this is physics

Aldehydes and Ketones. Aldehydes and ketones are classes of organic compounds that contain a carbonyl (C=O) group.

that's the correct answer

can I get brainilest

Answer:

0.123 mol

Explanation:

1 mol Na/22.99g na=0.123 mol

Answer:

[tex]\boxed {\boxed {\sf 0.261 \ mol \ B}}[/tex]

Explanation:

We are asked to find the number of moles in a sample of 2.82 grams of boron.

We convert grams to moles using the molar mass or the mass of 1 mole of a substance. These values are found on the Periodic Table. They are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.

Look up the molar mass of boron (B).

Convert using dimensional analysis. Set up a conversion factor using the molar mass.

[tex]\frac {10.81 \ g \ B}{ 1 \ mol \ B}[/tex]

We are converting 2.82 grams of boron to moles, so we multiply by this value.

[tex]2.82 \ g \ B *\frac {10.81 \ g \ B}{ 1 \ mol \ B}[/tex]

Flip the ratio so the units of grams of boron cancel.

[tex]2.82 \ g \ B *\frac { 1 \ mol \ B}{10.81 \ g \ B}[/tex]

[tex]2.82*\frac { 1 \ mol \ B}{10.81}[/tex]

[tex]\frac {2.82}{10.81} \ mol \ B[/tex]

[tex]0.2608695652 \ mol \ B[/tex]

The original value of grams has 3 significant figures, so our answer must have the same. For the number we found, this is the thousandth place. The 8 in the ten-thousandth place tells us to round the 0 up to a 1.

[tex]0.261 \ mol \ B[/tex]

There are approximately 0.261 moles of boron (B)in 2.82 grams of boron.

Answer:

Aluminium sulphate is an inorganic compound.

Answer:

Learning Task 3. Solving word problems involving multiplication of deci-

the

A cstep in solving word problems. Do these in your notebook. ),

1. A clerk is paid P 45.25 per hour for 40 hours a week, 1.50 times the

regular rate for overtime and double the rate for a holiday. How much

holiday?

2. fofkmputer programmer earns a regular hourly rate of P50.00. If he

worked 42.75 hours in a week, how much did he earn?

3. Arthur earns P1350.00 a day. He sets aside 0.10 of this for savings.

How much does he save in a month?

4. Mr. Fernandez has a monthly pay of P 5,450. The tax deducted from

year?

5. Dianne works 2.5 hours a day from Monday to Friday and 3.75 hours

his a

on Saturday. If he is paid P25.00 per hour, how much does he earn in

a

week?

Explanation:

Learning Task 3. Solving word problems involving multiplication of deci-

the

A cstep in solving word problems. Do these in your notebook. ),

1. A clerk is paid P 45.25 per hour for 40 hours a week, 1.50 times the

regular rate for overtime and double the rate for a holiday. How much

holiday?

2. fofkmputer programmer earns a regular hourly rate of P50.00. If he

worked 42.75 hours in a week, how much did he earn?

3. Arthur earns P1350.00 a day. He sets aside 0.10 of this for savings.

How much does he save in a month?

4. Mr. Fernandez has a monthly pay of P 5,450. The tax deducted from

year?

5. Dianne works 2.5 hours a day from Monday to Friday and 3.75 hours

his a

on Saturday. If he is paid P25.00 per hour, how much does he earn in

a

week?

Answer:

The answer is B(the path water takes from Earth to the clouds and back again)

Answer: I'll leave the answer rounded to three sig figs.

mark me brainlist

So, you can say that in a hydrogen atom, an electron located on  

n

i

=

2

that absorbs a photon of energy  

4.85

⋅

10

−

19

J

can make the jump to  

n

f

=

6

.

Explanation:

The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from  

n

i

=

2

to  

n

f

=

6

.

A good starting point here will be to calculate the energy of the photon emitted when the electron falls from  

n

i

=

6

to  

n

f

=

2

by using the Rydberg equation.

Answer:

The water cycle consists of three major processes: evaporation, condensation, and precipitation. Evaporation is the process of a liquid's surface changing to a gas. In the water cycle, liquid water (in the ocean, lakes, or rivers) evaporates and becomes water vapor.

Explanation:

Answer:

minerals

Explanation:

Hope this helps