I need some help pls with science

Answer:

1.5 moles

Explanation:

O   mole weight = 15.999

O2 mole weight = 2 * 15.999 = 31.998 gm

48 / 31. 998  = ~ 1.5 moles

Answer:

D

Explanation:

Of the four given equations, we want to determine which will most likely have a positive ΔS.

A positive ΔS indicates an increase in entropy. Recall that entropy can be described as the "randomness" of a substance. Therefore, gases have the highest entropy, followed by liquids and solids.

Examining each answer choice:

The collision and decomposition of 2 ammonium nitrate molecules results in the formation of 2 molecules of [tex]N_2O[/tex] and 4 molecules of [tex]H_2O[/tex]

Ammonium nitrate decomposes to produce nitrous oxide and water according to the following equation:

[tex]NH_4NO_3 --- > N_2O + 2H_2O[/tex]

In the above, a mole of ammonium nitrate decomposes to form a mole of nitrous oxide and 2 moles of water.

If moles of ammonium nitrate decomposes, the equation becomes:

[tex]2NH_4NO_3 ---- > 2N_2O + 4H_2O[/tex]

Thus, 2 moles of nitrous oxide and 4 moles of water would be formed.

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Answer:

After 30 minutes have passed, the solution inside the dialysis tubing and the solution in the beaker will be tested for glucose and starch

-The presence of glucose will be tested with Benedict's solution, Testape®, or Clinistix

2NOCI(9) + 2NO(g) + Cl2(9) shows decrease in entropy.

Entropy in thermodynamic refers to the degrees that represent the absence of system's thermal energy that is not available to perform mechanical work, which is the degree of disorder or randomness in the system.

Therefore, 2NOCI(9) + 2NO(g) + Cl2(9) shows ddecrease in entropy because it shows degree of disorderliness is low

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Based on the data provided, 0.2375 L of water and 81.225 g of Kool-aid are required to make 237.5 mL of 1 M solution of Kool-aid.

The molarity of a solution is the amount in moes of a solute dissolved in a given volume of solution in litres.

The moles and mass of solute is calculated using the formula below:

1 mole of Kool-aid = 342 g

Molarity of solution = 1 M

Volume of solution = 237.5 mL = 0.2375 L

number of moles solute = molarity × volume

number of moles of Kool-aid = 1 M × 0.2375 L = 0.2375 moles

Mass of Kool-aid required = 0.2375 × 342 = 81.225 g of Kool-aid.

Therefore, 0.2375 L of water and 81.225 g of Kool-aid is required to make 237.5 mL of 1 M solution of Kool-aid.

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Explanation:

Normal saline contains Na+ and Cl-. Extracellularly,there is more Na+ and Cl- than intracellularly and most often during loss of bodily fluid,it is extracellular fluid that is lost and so the Na+ and Cl- ions in saline replenish these. Even if the loss of fluid is intracellular,it can still be replenished (passively )from the extracellular fluid into the intracellular fluid. Conversely, distilled water is just water which lacks any special electrolytes to carry out these functions as the normal saline

Phosphorus has a larger atomic mass is your answer. :)

Answer:

35°C would have the highest velocity because it's temperature is lesser hence the inter molecular forces between it molecules will be stronger and the velocity of the molecules will be lower than the rest.

the 75°C one would have the highest flow rate because its molecules will have a higher velocity and the inter molecular force between them will be less stronger

Answer:

Explanation:

Universal indicator. The universal indicator turns orange in acidic solutions with a pH of  

Answer:

The mass of SO₃ formed is 120 g

Explanation:

The balanced equation for the reaction is given below:

2SO₂ + O₂ —> 2SO₃

Next, we shall determine the mass of SO₂ that reacted and the mass of SO₃ produced from the balanced equation. This can be obtained as follow:

Molar mass of SO₂ = 32 + (16×2)

= 32 + 32

= 64 g /mol

Mass of SO₂ from the balanced equation = 2 × 64 = 128 g

Molar mass of SO₃ = 32 + (16×3)

= 32 + 48

= 80 g /mol

Mass of SO₃ from the balanced equation = 2 × 80 = 160 g

Thus,

From the balanced equation above,

128 g of SO₂ reacted to produce 160 g of SO₃.

Now, we will get the mass of SO₃ by the reaction of 96 g of SO₂. This can be obtained as follow:

From the balanced equation above,

128 g of SO₂ reacted to produce 160 g of SO₃.

Therefore, 96 g of SO₂ will react to produce = = 120 g of SO₃.

With this, the mass of SO₃ formed is 120g

Answer:

C.) They act as catalysts.

The name of the compound which is formed by the combination of nitrogen, carbon and hydrogen atoms is ethylamine.

Compounds are the substances which are prepared by the mixture of different elements.

In the question it is described that first nitrogen atom is attached with 2 hydrogen atoms and one lone pair of electrons as [tex]\ddot{NH_{2}}\\[/tex]. Now with this molecule one carbon atom with two hydrogen atoms are attached (CH₂) and with this carbon atom another carbon atom with three hydrogen atoms are attached as (CH₃).

So obtained compound is NH₂-CH₂-CH₃ named as ethyl amine.

Hence name of the given compound is ethylamine.

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The carbonic acid dissociation constant, ocean pH and the bicarbonate ion concentration are required to to calculate the ocean concentration of the carbonate ion.

The concentration of a chemical species is the amount in moles per given litre of solution.

To calculate the ocean concentration of the carbonate ion, the data needed are:

The equation for calculating the carbonate ion concentration is given below:

[tex][CO_3^{2-}] = \frac{K × [HCO_3^{-}]}{H^{+}}[/tex]

Therefore, to calculate the ocean concentration of the carbonate ion, the carbonic acid dissociation constant, ocean pH and the bicarbonate ion concentration are required.

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Answer:

The parts of the system is the mouth, throat or the pharynx if you want the scientific term, esophagus, stomach, small intestine, large intestine, rectum.

if you want just say intestine for those answers best if you say small and large though

Answer:

Answer:

A. It is stable

Explanation:

Ed22

Stability is the  property that would xenon most likely to have. Therefore, the correct option is option A.

Chemically speaking, xenon is a gas with the atomic number 54 and the symbol Xe. It is a thick, colourless, and odourless noble gas that is present in minute levels in Earth's atmosphere. It may go through a few chemical reactions, such as the creation of xenon hexafluoroplatinate, which is the initial noble gas combination to be created, despite typically being unreactive.

Flash lamps, arc lamps, and general anaesthetics all employ xenon. The early laser designs utilised xenon flash lamps for pumps and a xenon monomer molecule (Xe2) for the lasing medium in the initial excimer laser design. Stability is the  property that would xenon most likely to have.

Therefore, the correct option is option A.

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Answer:

false

Explanation:

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it. A buffer protects from ph increasing.

Chemical buffers are substances that are necessary to preserve the constancy of pH in various biological and chemical systems. Therefore, the given statement is True.

They are composed of either a weak base and its conjugate acid, or vice versa. The weak base component of the buffer reacts with the acid upon addition, reducing the pH rise. Similarly, when a base is added, the weak acid component of the buffer reacts with it to prevent the pH from falling significantly.

This ability to withstand pH variations is essential for preserving the proper operation of biological systems, such as blood pH in the human body, as well as in other laboratory and industrial operations where it is necessary to preserve a stable pH for best results.

Therefore, the given statement is True.

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Answer:

Sorry I'm late man, but I bombed this quiz and here's the actual answers

1. functional group (top row); uses (bottom row)

2. Uses of Functional Groups Involving Oxygen

3. carbonyl

4. N is single bonded to R, and single bonded twice to H. (Or B)

5. RCOOH

6. a carboxylic acid and an amine

7. ethylamine

8. alchohol

9. alkyl halide

10. A central carbon is double bonded to O above, and single bonded to R below left and to O R prime below right. (Or B again)

Explanation:

Keep grinding. I know I will. I'm going to have to pull some all nighters in order to catch up before I work this summer. I'm so ahead on my classes and it still looks like I'll be doing school til the middle of June. You're not alone (If you're in the same situation as me that is). Good luck!

Answer:

I think it is alkyl halide

Explanation:

Edg 2022

Answer:

neutron number

Explanation:

^

Answer:

v2 = 9.69L

Explanation:

p1 v1/t1 = p2 v2/t2

P = Pressure

V = Volume

T = Temperature

T = 273k

P = 1 atm

1.23 x 7.75/273k = 1xv2/273

The slashes I used represent as fractions. (:

Answer:

A fever is a sympton. A headache is a sign. increase pulse rate is a sign. low blood pressure is a sign. feeling of dizzinies is a symptom. stomache is a symptom.

Explanation:

I learned these in class before and they make the most sense.

In the titration of sodium oxalate with potassium permanganate the pink color change is due to shift in equilibrium position of the reaction

Chemical equilibrium is the equilibrium that exists between chemical species in which the rate of forward reaction is equal to the rate of backward reaction.

The pink color change in the that occurs in the titration of sodium oxalate with potassium permanganate is due to shift in equilibrium position of the reaction.

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Answer:

It depends

(plum will spoil more quickly at warm temperatures)

Explanation:

When a reaction vessel initially containing 68.0 kg [tex]CH_4[/tex] and excess steam yields 16.9 kg [tex]H_2[/tex], the percent yield would be 49.8%

Recall that: percent yield = yield/theoretical yield x 100%

From the equation of the reaction:

[tex]CH_4 + 2H_2O --- > CO_2 + 4H_2[/tex]

The mole ratio of methane to steam is 1:4.

Mole of 68.0 kg methane = 68000/16.0 = 44239.4 moles

Equivalent mole of  [tex]H_2[/tex]= 16,957.6 moles

Mass of 16,957.6 moles  [tex]H_2[/tex] = 16,957.6 x 2 = 33,915.2 grams or 33.92 kg

Percent yield = 16.9/33.92 x 100% = 49.8%

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The percentage yield of the reaction that yields 16.9 kilograms of Hydrogen gas, H₂ is 66.3%

CH₄ + H₂O —> CO + 3H₂

Molar mass of CH₄ = 16 g/mol

Mass of CH₄ from the balanced equation = 1 × 16 = 16 g = 0.016 Kg

Molar mass of H₂ = 2 g/mol

Mass of H₂ from the balanced equation = 3 × 2 = 6 g = 0.006 Kg

SUMMARY

From the balanced equation above,

0.016 Kg of CH₄ reacted to produce 0.006 Kg of H₂

From the balanced equation above,

0.016 Kg of CH₄ reacted to produce 0.006 Kg of H₂

Therefore,

68 Kg of CH₄ will react to produce = (68 × 0.006) / 0.016 = 25.5 Kg of H₂

Percentage yield = (Actual / Theoretical) × 100

Percentage yield = (16.9 / 25.5) ×100

Percentage yield = 66.3%

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Answer:

302.75 Liters

Explanation:

Given:

P = 1 atm

V = ?

n = 13.5 moles

R = 0.0821 atm x L / mole x K

T = 273.15 K

PV = nRT

(1) (V) = (13.5) (0.0821) (273.15)

V = 302.75 Liters

When a bunsen burner is properly adjusted, the flame look like outer violet and inner blue colour.

When a burner is properly adjusted the flame should have an outer violet oxidizing flame and an inner blue reducing flame. The temperature of blue colour is 15000 degree Celsius whereas the cool region outside the blue has 3000C temperature.

So we can conclude that When a bunsen burner is properly adjusted, the flame look like outer violet and inner blue colour.

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