Answer:
Explanation:
0.0
Four bonding pairs around a central atom results in a ________.
The mass of an atom of element x is equivalent to the total mass of 7 hydrogen atoms
a volume of L is also equal to
Answer: One-Thousand of a cubic metre
Explanation:
One lire is the Volume of a cube with 10 cm sides
Heating a particular ether with HBr yielded a single organic product. Which of the following conclusions can be reached?
A) The reactant was a methyl ether.
B) The reactant was a symmetric ether.
C) The reactant was a cyclic ether.
D) Both B and C may be correct.
The conclusion that can be reached is ( C ) ; The reactant was a cyclic ether
When a particular ether is heated with HBr and it yields a single organic product the only reactant that can be used to achieve this from the options listed is, Cyclic ether. because the reaction between cyclic ether and HBr will produce a single product which consists of an alcohol group ( -OH group ) and a Bromide group on each ends.
While reactants like symmetric ether will produce alcohol and alkyl bromide
Hence the conclusion that can be reached is that the reactant used was a cyclic ether
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You go to a convenience store to buy candy and find the owner to be rather odd. He allows you to buy pieces in multiples of four, and to buy four, you need $0.23. He only allows you to do this by using 3 pennies and 2 dimes. You have a bunch of pennies and dimes, and instead of counting them, you decide to weigh them. You have 636.3 g of pennies, and each penny weighs 3.03 g. Each dime weighs 2.29 g. Each piece of candy weighs 10.23 g.
Required:
a. How many pennies do you have?
b. How many dimes do you need to buy as much candy as possible?
c. How much should all these dimes weigh?
d. How many pieces of candy could you buy? (number of dimes from part b)
e. How much would this candy weigh?
f. How many pieces of candy could you buy with twice as many dimes?
a. We have 210 pennies
b. We need 140 dimes to buy as much candy as possible.
c. All these dimes should weigh 320.6 g.
d. We can buy 70 pieces of candy.
e. The total weight of the candies will be 2864.4 g
f. Using 3 pennies and 2 dimes as a pack to buy candies we can not buy more pieces of candy because we would need more pennies.
a. To find the number of pennies we need to divide the total mass of pennies ([tex]m_{t_{p}}[/tex]) by the mass of each one of them ([tex]m_{p}[/tex]):
[tex] N = \frac{m_{t_{p}}}{m_{p}} = \frac{636.3 g}{3.03 g} = 210 [/tex]
Hence, we have 210 pennies.
b. We can find the total number of pieces in multiples of four that we can buy with 210 pennies. To buy one piece we need to use 3 pennies and 2 dimes, so the number of total pieces is:
[tex] 3P = 210 [/tex]
Where P is for pennies
[tex] P = \frac{210}{3} = 70 [/tex]
Hence, we can buy a total of 70 pieces in multiples of four candies.
Now, from this total of 70 pieces, we can use the following number of dimes:
[tex] 2D = 70 [/tex]
Where D is for dimes
[tex] D = \frac{70}{2} = 140 [/tex]
Therefore, we need 140 dimes to buy as much candy as possible.
c. The mass of the total amount of dimes ([tex] m_{t_{d}}[/tex]) is:
[tex] m_{t_{d}} = 140*2.29 g = 320.6 g [/tex]
Hence, all these dimes should weigh 320.6 g.
d. We know that we can buy a total of 70 pieces in multiples of four candies (calculated above).
Then, we can buy 70 pieces of candy.
e. Knowing that each piece is a multiple of 4 candies, the weight of the 70 pieces of candy ([tex]m_{c}[/tex]) is:
[tex] m_{c} = 70*4*10.23 g = 2864.4 g [/tex]
f. Since we can buy pieces in multiple of four candies using 3 pennies and 2 dimes if we have now twice as many dimes, we can not buy more pieces of candy because we would need more pennies.
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Pls helppppppppppppp
Answer:
Option A is your answer
Explanation:
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b. Chlorophenol has three isomers. Draw the skeletal formula for these three isomers and the structural
formula for one of them.
(4 marks)
Answer:
Explanation:
The image ending 1318 is 2-chlorophenol. The image ending 1725 is 3-chlorophenol and the image ending 1917 is 4-chlorophenol
How far will a dog travel in 8 hours at a speed of 4 meters/hour
compared to those
5. Electrons farther away from the nucleus in an atom have
closer to the nucleus.
O A. lower energy
OB. higher energy
O C. the same energy
O D. higher or lower energy, depending on the element
Explanation:
higher or lower energy, depending on the element
Answer:
B
Explanation:
In the shorthand notation for a galvanic cell, a double vertical line (A) represents 123) A) a gas B) a cathode C) a salt bridge D) a single phase boundary
Write a balanced chemical equation for the following reaction in an acidic solution: Copper metal reacts with aqueous nitric acid to form aqueous copper (II) nitrate, liquid water and gaseous nitrogen monoxide.
Answer:
Cu(s) + 4HNO₃(aq) -> Cu(NO₃)₂(aq) + 2NO₂(g) + 2H₂O(l)
Is it me or is this year moving very fast?
Does anyone even remember Easter?
Answer:
I think you are moving fast my friend,but i don't remember Easter.
Answer:
yo fr i dont even remember last year christmas
Explanation:
After a scientist has drawn a conclusion, tests the conclusion, and is satisfied with the results,
what is the next step in the scientific process?
A.making a hypothesis
B.experimenting
C.communicating results
D.analyzing data
Answer: B
Explanation:
is clarity a physical or chemical property?
If the density of HCl is 1.49 g/mL, What is the volume of 3.5 g of hydrochloric acid?
PLEASE HELP I NEED THE ANSWER ASAP!!
Answer- 2.3
Explanition-
The density of hydrochloric acid is
1.49
g/mL
, and the mass is
3.5
g
. We need to use this information to find the volume of the acid. Since the above equation shows us the relationship between density, mass, and volume, we can rearrange the equation to find the volume:
Volume
=
Mass (g)
Density (g/mL)
=
3.5
g
1.49
g/mL
=
2.349
mL
The question asks for the answer to have the correct number of significant figures. Since solving this question requires division, the measurement with the least number of significant figures decides how many significant figures the final answer should have.
1.49
has three significant figures, while
3.5
has two significant figures. Therefore, the final answer for volume can have only two significant figures, which gives the final result as:
2.3
.
The density of compound is its mass divided by volume. The volume of 3.5 g hydrochloric acid with a density 1.49 g/ml is 2.34 milliliter.
What is density ?Density of a substance is the measure of its mass per volume. Thus how much denser is it in a particular volume is represented by the physical quantity density.
Density of a compound is dependant on its mass, volume, temperature, bond type and pressure. The ratio of density of any object to the density of water is called specific gravity.
It is given that the mass of hydrochloric acid is 3.5 g and density is 1.49 g/ml. The volume of HCl solution can be calculated as follows:
Density = mass/volume
volume = mass/density
= 3.5 g/1.49 g/ml
= 2.34 ml.
Hence, the volume of HCl solution is 2.34 ml.
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illustrate the law of multiple proportions using the formation of SO2 and SO3 by sulphur and oxygen
In SO2 and SO3, oxygen combines with sulphur in a fixed ratio.
The law of multiple proportion states that if two elements combine with each other to form more than one chemical compound, then the various masses of the elements which combine with a fixed mass of the other element are in simple multiple ratios.
To illustrate this law, sulphur forms two oxides, SO2 and SO3. The ratio of the oxygen that combines with a fixed mass of sulphur in the two compounds is 2:3 in accordance to the law of multiple proportion.
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What is the name of this molecule?
A. Hexane
B. Hexyne
C. 2-pentane
D. Pentane
A photon of 498nm was emitted from a silicon atoms. Calculate the energy of all the atomic levels of silicon and show that the atomic levels are quantized.
The Energy of a photon in an atomic level, E = hc / λ
where
h=Planck's constant =6.626 × 10^{−34}Js
c=speed of light=3×10^8m/s
λ = photon's wavelength (metres),
E={6.626×10^{-34}Js × 3× 10^{8}m/s / {498}m/s
E= 3.99×10^{-28}J
Because all the energy levels of electrons in an atom are quantized,and cannot exist on different values of energies between them. So, when an electron moves from one energy level to another, it would release or absorb a specific and same amount of energy. Therefore, the energy of all the atomic levels of silicon must be E= 3.99×10^{-28}J
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convert 6.86 km into m
Hi there!
1 km=1000m
so
6.86 km = 6.86×1000= 6860 m
have a nice day
#YoghurtCup!
Density = 12 g/mL and the Volume = 4 mL. What is the mass?
Answer:
48
Explanation:
12 g/ml * 4 ml = 48
Is thallium, TI, a solid, liquid, or gas?
Answer:
Thallium is a Solid
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The temperature of 150 mL of water is 25°C. What must happen for the temperature of the
water to increase to 35°C?
A. Thermal energy must be transferred to the water to increase the average kinetic
energy of the water molecules.
B. Thermal energy must be transferred from the water to decrease the average
kinetic energy of the water molecules.
C. Water must be removed to decrease the thermal energy.
D. More water must be added to increase the thermal energy.
Answer:D
Explanation:
Calculate the liters of a 4.40 M KCl solution to obtain 0.200 mole of KCI
Answer:
[tex]\boxed {\boxed {\sf 0.0455 \ L}}[/tex]
Explanation:
We are asked to calculate the liters given the molarity and moles in a solution.
Molarity is a measure of concentration in moles per liter. It is calculated with the following solution:
[tex]molarity= \frac{moles \ of \ solute}{liters \ of \ solution}[/tex]
The molarity of the solution is 4.40 molar of potassium chloride (KCl). 1 molar is equal to 1 mole per liter, so the molarity is also 4.40 moles of potassium chloride per liter. There are 0.200 moles of potassium chloride or solute. The liters of solution is unknown, so we can use the variable x.
molarity= 4.40 moles KCl / L moles of solute = 0.200 mol KCl liters of solution = x[tex]4.40 \ mol \ KCl/ L = \frac{ 0.200 \ mol \ KCl}{x}[/tex]
Since we are solving for x, we must isolate the variable. First, cross multiply. Multiply the first numerator by the second denominator, then the first denominator and the second numerator.
[tex]\frac {4.40 \ mol \ KCl/ L}{1} = \frac{ 0.200 \ mol \ KCl}{x}[/tex]
[tex]4.40 \ mol \ KCl / L * x= 1 * 0.200 \ mol \ KCl[/tex]
[tex]4.40 \ mol \ KCl / L * x= 0.200 \ mol \ KCl[/tex]
x is being multiplied by 4.40 moles of potassium chloride per liter. The inverse operation of multiplication is division. Divide both sides by 4.40 mol KCl/L
[tex]\frac {4.40 \ mol \ KCl / L * x}{4.40 \ mol \ KCl / L}= \frac {0.200 \ mol \ KCl}{{4.40 \ mol \ KCl / L}}[/tex]
[tex]x= \frac {0.200 \ mol \ KCl}{{4.40 \ mol \ KCl / L}}[/tex]
The units of moles of potassium chloride cancel.
[tex]x= \frac {0.200}{{4.40 L}}[/tex]
[tex]x= 0.0454545454545 \ L[/tex]
The original measurements of liters and moles have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ten-thousandth place (0.0454545454545). The 5 to the right of this place (0.0454545454545) tells us to round the 4 up to a 5.
[tex]x \approx 0.455 \ L[/tex]
There are approximately 0.455 liters in a 4.40 molar solution with 0.200 moles of solute.
what is the chemical formula of (Sodium hydroxide ) ??
[tex]\huge{ \color{black}{ \boxed{ \color{hotpink}{Answer}}}}[/tex]
what is the chemical formula of (Sodium hydroxide ) ??
⚘ NaOHSodium hydroxide, Sodium oxidanide[tex] \: [/tex]
[tex]\large\tt\:⚘ \: MishiChaeYoon \: ⚘[/tex]
Answer:
The formula of Sodinm hydroxide is NaOH
Hope it helps
A molecule of a compound has 12 atoms of carbon 24 atoms of hydrogen and 6 oxygen atom
What is its empirical formula also write its molar mass and empirical formula mass
Please hel
Please help thank you (15 points)
Answer:
D. The sun has less gravitational pull on Pluto because it is farther away.
True or False
A sphere is a group of parts that work together as a whole.
False is the correct answer.
Describe two methods by which light is produced.
Answer:
gas lamp, led light, laser, inculding cfls andincandescent lights
Why is it difficult to rub away any carbon atoms from diamonds?
Answer:
because diamond is the allotrope of carbon and diamond is the hardest substance in the world and it's melting point is very very high so it's difficult
Hello I need help please
Answer:
A is the answer hope this helps if wrong I ont know