Answer:
a. BH₃
Explanation:
According to the octet rules, atoms reach stability when are surrounded by eight electrons in their valence shell when they combine to form a chemical compound.
From the options, the only compound in which the central atom does not meet the octet rules is BH₃. The central atom is boron (B), which has 3 electrons in its valence shell. When B is combined with hydrogen (H), 3 electrons from the 3 atoms of H are added. The total amount of electrons is 6, fewer than 8 electrons needed to meet the rule.
hope this helps
Convert 48 g O2 to moles of O2
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
Instructions: In this activity you will be making a series of kool-aid solutions. Make sure to record all data and answer all the questions below.
Step 1: You will prepare a 237.5 ml kool-aid solution with a concentration of 1M. The molar mass of kool-aid (or sugar since kool-aid is basically sugar C12H22O11.) is 342 g/mol. Show the calculations below which helped you create your 1M solution. Note: 237.5 mL is approximately one cup.
Please show your work here.
Liters of water needed ______________
Molarity of kool-aid needed______________
Grams of kool-aid needed ______________
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.
What is molarity of a solution?The molarity of a solution is the amount in moes of a solute dissolved in a given volume of solution in litres.
Molarity = number of moles/ volume in litresThe moles and mass of solute is calculated using the formula below:
moles = mass/molar massmass = moles × molar mass1 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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Indicate whether the following are signs or symptoms:
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.
Which indicator displays orange in acidic solutions?
Universal indicator
Methyl orange indicator
Thymol blue indicator
Phenol red indicator
Answer:
Explanation:
Universal indicator. The universal indicator turns orange in acidic solutions with a pH of
Name the parts of the digestive system.
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:
The digestive system involves the mouth, throat, esophagus, stomach, small intestine, large intestine, pancreas, liver, and gallbladder.When coal burns, the reaction
A. releases heat and is endothermic.
B. releases heat and is exothermic.
C. absorbs heat and is endothermic.
D. absorbs heat and is exothermic
A conclusion drawn through reasoning is called an
evaluation
inference
oversight
understanding
1) Which of the following reactions is most likely to have a positive ASsys? (System refers to the reaction.)
a. SiC(s) + 2CO(g) → SiO2(s) + 3C(s)
b. 6CO2(g) + 6H2O(g) → C6H12O6(aq) + O2(g)
c. CO(g) + Cl2(g) → COCl2(g)
d. 2HNO3(1) + NO(g) + 3NO2(g) + H2O(1)
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:
A is unlikely to have a positive ΔS, as gases are being converted into solids. As a result, entropy is lowered. B is likewise unlikely to have a positive ΔS. Multiple moles of gases are being converted into solution and another gas, leading to a decrease in "randomness."While all species involved in C are gases, we can see that two moles of gases react to form only one. Because the amount of gases decrease as the reaction proceeds, the amount of "randomness" likewise decreases, indicating a decrease in entropy. D is the best answer. One mole of gas reacts to form three moles of gas, thereby increasing "randomness" and hence increasea entropy.Which factor varies between the isotopes of an element?.
Answer:
neutron number
Explanation:
^
Which of these steps in the rock cycle occurs only in the formation of metamorphic rock.
a erosion
b compaction
c cementation
d recyrstallization
How many mL of solution of 2. 00 M KI would you need to
prepare 100 mL of a 0. 600 M KI solution?
Why do hospitals use saline instead of distilled water?.
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
which will get spoiled faster: plum in water or plum in the open?
Answer:
It depends
(plum will spoil more quickly at warm temperatures)
Explanation:
Enzymes are proteins that speed up chemical reactions in the body.
How do they work?
A.) They increase the concentration of reactants.
B.) They decrease the concentration of products.
C.) They act as catalysts.
D.) They increase the surface area of reactants.
Answer:
C.) They act as catalysts.
You are given three samples of the same shampoo at three different temperatures: 35°C, 50°C, and 75-C. Which sample has the highest viscosity? (Would flow the slowest). Which sample has the highest flow rate? (Would flow the fastest). Explain each answer.
Help me please
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
I NEED THIS FOR A TEST, FAST!
The element phosporus is located to the right of the element magnesium along the same period in the periodic table.
Which best describes the relationship of the elements?
Magnesium has a larger atomic number.
Phosphorus has a larger atomic mass.
Magnesium is in the same category as phosphorus.
Phosphorus has similar chemical properties as magnesium.
Which best describes the relationship of the elements?
Phosphorus has a larger atomic mass is your answer. :)
Scenario
HURRY I NEED HELP ASAP
A student masses 40 g copper (11) oxide Cuo, a black solid, and heats the substance using a Bunsen burner until the sample turns a reddish color. The chemical equation for the reaction issiven below. According to the reaction, the copper (1) oxide decomposes to produce copper(1) oxide and oxygen
4CuO → 2Cu2O + O2
Black solid Red solid Colorless gas
40 g. ? g
? g
Based on the evidence, write a scientific explanation describing the exact mass of the copper() oxide produced Provide mathematical evidence and give your reasoning in a way that demonstrates your understanding of the scientific principles involved.
72 g of Copper(i) oxide will be produced by 40 g of CuO base on the law of conservation of mass.
What mass of copper (i) oxide is produced?The law of conservation of mass states that mass remains constant at the end of every reaction.
The equation of the reaction is given below:
[tex]4CuO → 2Cu_2O + O_2[/tex]
Based on the equation of reaction, 4 moles of copper (ii) oxide produces 2 moles of copper (i) oxide.
Mass of 4 moles of CuO = 4 × 80 = 160 g
Mass of 2 moles of copper (i) oxide = 2 × 144 g = 288 g
Mass of Copper(i) oxide produced by 40 g of CuO will be: 40 × 288/160 = 72 g
Therefore, 72 g of Copper(i) oxide will be produced by 40 g of CuO.
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When a bunsen burner is properly adjusted, what should the flame look like?.
When a bunsen burner is properly adjusted, the flame look like outer violet and inner blue colour.
What is the clolur of flame?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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A student places a starch and water solution into a bag of dialysis tubing and then ties off the ends. Next, he places the filled bag into a beaker of distilled water. Water will now ________ the bag by the process of ________.
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
If 26.5 L of nitrogen at 748 mm Hg are compressed to 765 mm Hg at constant temperature. What is the new volume?
Answer:
25.91 L
Explanation:
P1V1= P2V2
748 (26.5) = 765 ( V2) V2 = 25.91 LITERS
Which property would xenon most likely have? it is stable. it is a solid. it is flammable. it is silver in color.
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.
What is xenon?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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What is the name of this compound? h single bonded to n with a pair of electron dots above and a single bond to h below, single bonded to the right to c with h above and below, and another c with h above, below, and right. ethanal ethylamine ethanoic acid methyl ethanoate
The name of the compound which is formed by the combination of nitrogen, carbon and hydrogen atoms is ethylamine.
What are compounds?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).
Ethanal is wrong because in given compound (-CHO) group is not present.Ethanoic acid is wrong because in given compound (-COOH) group is not present.Methyl ethanoate is also wrong because in given compound (-ROO) group is not present.So obtained compound is NH₂-CH₂-CH₃ named as ethyl amine.
Hence name of the given compound is ethylamine.
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Determine the volume of a balloon at STP assuming that it occupies a volume of 7.75 L at a temperature of 0ºC and a pressure of 125 kPa.
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. (:
Which reaction would cause a decrease in entropy?
A. 2NOCI(9) + 2NO(g) + Cl2(9)
B. 2NH3(9) ► N2(g) + 3H2(9)
C. 2CC14(9) + O2(g) → 2C0C12(g) + 2Cl2(9)
D. CO(g) + 3H2(g) → CH4(9) + H20(9)
2NOCI(9) + 2NO(g) + Cl2(9) shows decrease in entropy.
What is 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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what mass of sulfur trioxide is formed from 96 g of sulfur dioxide?
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
What is the name of the functional group that is attached to this hydrocarbon backbone? 2 carbons are double-bonded together; the pair is single bonded to h below right and upper c l below left, above left, and above right. ether alcohol alkyl halide carbonyl group
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
When two ammonium nitrate molecules collide with each other and then chemically decompose as a result, how many NEW molecules (in total) will be produced?
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]
Decomposition reactionAmmonium 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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What is the percent yield when a reaction vessel that initially contains 68.0 kg CH4 and excess steam yields 16.9 kg H2
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%
Percent yieldRecall 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%
Balanced equationCH₄ + 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
How to determine the theoretical yield of H₂From 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
How to determine the percentage yield Actual yield of H₂ = 16.9 KgTheoretical yield of H₂ = 25.5 KgPercentage yield =?Percentage yield = (Actual / Theoretical) × 100
Percentage yield = (16.9 / 25.5) ×100
Percentage yield = 66.3%
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In many titrations, you need to add an indicator that changes color when the titration is complete. The titration of sodium oxalate with potassium permanganate does not use an indicator. However, a pink color does appear to signal the end of the titration. What causes the color change signaling the completed titration of sodium oxalate with potassium permanganate?.
In the titration of sodium oxalate with potassium permanganate the pink color change is due to shift in equilibrium position of the reaction
What is chemical equilibrium?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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A chemical buffer is a solution that increases pH changes when small quantities of an acid or base are added. True False
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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