Select the correct answer.
How many electrons does a covalent bond consist of?
A.
one
B.
two
C.
four
D.
eight
Explanation:
A covalent bond can be thought of as a 'shared pair' of electrons, so there are 2 electrons in each bond. That means that a double bond will have 4 electrons in the space between the bonded nuclei, and a triple bond will have 6.
MARK ME AS BRAINLISTplease help quick the 6th question is “What is a catalyst?” (include all three parts)
1.
Archaeologists have discovered the legendary Golden Igloo of the Pribiloff Islands, a structure consisting of a
halfspherical shell with an inner diameter of 1.25 m and an out diameter of 1.45 m. What is the value of this antiquity,
given that gold currently sells for $1,263/ounce and has a density of 19.3 g/cm3? (Note that 1 ounce = 31.1034768 g)
Answer:
The value of the Golden Igloo is $227.4 million.
Explanation:
First, we need to find the inner and the outer volume of the half-spherical shell:
[tex] V_{i} = \frac{1}{2}*\frac{4}{3}\pi r_{i}^{3} [/tex]
[tex] V_{o} = \frac{1}{2}*\frac{4}{3}\pi r_{o}^{3} [/tex]
The total volume is given by:
[tex] V_{T} = V_{o} - V_{i} [/tex]
Where:
[tex] V_{i} [/tex]: is the inner volume
[tex]r_{i}[/tex]: is the inner radius = 1.25/2 = 0.625 m
[tex] V_{o} [/tex]: is the outer volume
[tex]r_{o}[/tex]: is the outer radius = 1.45/2 = 0.725 m
Then, the total volume of the Igloo is:
[tex] V_{T} = \frac{2}{3}\pi r_{o}^{3} - \frac{2}{3}\pi r_{i}^{3} = \frac{2}{3}\pi [(0.725 m)^{3} - (0.625 m)^{3}] = 0.29 m^{3} [/tex]
Now, by using the density we can find the mass of the Igloo:
[tex] m = 19.3 \frac{g}{cm^{3}}*0.29 m^{3}*\frac{(100 cm)^{3}}{1 m^{3}} = 5.60 \cdot 10^{6} g [/tex]
Finally, the value (V) of the antiquity is:
[tex] V = \frac{\$ 1263}{oz}*5.60 \cdot 10^{6} g*\frac{1 oz}{31.1034768 g} = \$ 227.4 \cdot 10^{6} [/tex]
Therefore, the value of the Golden Igloo is $227.4 million.
I hope it helps you!
Which of the following are behavioral adaptations? Select all that apply.
A. playing dead
B. migration
C. type of teeth
D. hibernation
E. body coverings
Answer:
The 2 types of behavioral adaptation are migration, and hibernation. Explanation: Adaptation of animal is the fitness towards its environment.
Explanation:
can someone help me please
Answer:
it's d
Explanation:
I took the test and got it right
what type of lens is shown -covex lens
-this isnt a lens
concave lens
[tex]\mathfrak{\huge{\orange{\underline{\underline{AnSwEr:-}}}}}[/tex]
Actually Welcome to the Concept of the Lens and Ray Optics.
We must understand the Concept that,
1.) When a beam of parallel light pass through a Convex lens, all the rays get deviated and converges to a special point at the axis that is a Focus.
2.) When a beam of light passes through the Concave lens,the light beams diverge from one another forming a virtual focus in the primary side of lens,
Hence the above given diagram beam rays are diverging, it is a CONCAVE LENS
answer is C.) Concave lens
I really need help I'm not good with science
Answer:
A!!!!!!!!
Explanation:
Which chemical reaction below demonstrates the combustion of a hydrocarbon?
CAN SOMEONE PLEASE HELP ME OUT WITH THESE 2 QUESTIONS? ILL GIVE YOU A GOOD RATING!!
Type the correct answer in the box. Spell all words correctly. In which system are both energy and matter exchanged with the surroundings? In a(n) system both energy and matter are exchanged with the surroundings.
Answer:
open system
Explanation:
An open system is a system in which both energy and matter are exchanged with the surroundings.
What are some goals for science class virtual learning
Answer:
It wouldn't let me post it for some reason. Its all in the picture.
Really hope it helps!!:)
What is the main process by which water moves from land to the atmosphere?
Answer:
isn't that evaporation if not you can just delete my answer-
Explanation:
what is the molarity of 5.63 moles of lithium in 3.25 liters of solution
Answer:
1.73 Molar
Explanation:
The formula is Molarity=moles of solute/liters of solution, which can be written in whatever way you prefer, and examples include: M=N/V or M=mol/L.
M=N/V
M= [tex]\frac{5.63}{3.25}[/tex]
Divide 5.63 by 3.25. When you calculate this, you get 1.73, therefore your answer is 1.73 molar.
A student is doing an investigation on the movement of objects.
Why is it important for her to repeat the investigation several times?
8
This wasp was viewed under a microscope with a 40x objective lens and a 10x
eyepiece lens.
What was the total magnification
help its for my assessment
25 points
Answer:
400x
Explanation:
magnification=magnification of objective lens*magnification of eyepiece lens
m=40*10
m=400x
What Reactants are needed for photosynthesis?
Glucose and Oxygen
Carbon Dioxide and Water
Water and Oxygen
Carbon Dioxide and Oxygen
Answer:
Carbon dioxide and water.
Explanation:
If there isn't carbon dioxide, photosynthesis wouldn't happen as carbon dioxide is needed to transfer into the plant and after that the oxygen travels into the surroundings from the plant. There isn't any water, the plant wouldn't be able to make food called glucose.
collect some of chalk, limestone, marble, eggshells and seashells and mix them with a dilute acid. pass the gas produced into a small amount of limewater to test for carbon dioxide. is carbon dioxide gas produced in each case.
Explanation:
Yes carbon dioxide found in each case
PLEASE HELP!! i have no idea what this is
Answer:
0.1389mol
Explanation:
no of mol of Al in 7.5g=7.5g/27gmol^-1
=75/270mol
according to tge chemical equation
2mol of Al:1 mol of Al2S3
1mol of Al:0.5mol of Al2S3
therefore 75/270 mol of Al : 0.5*75/270 mol of Al2S3
=0.1389mol
What is the man’s weight on Mars where the acceleration due to gravity is 3.7 m/s2?
Answer:
6.39 × 10^23 kg (0.107 M⊕)
Explanation:
Science pls help me having trouble on the third one
Answer:
ijcQwertyjkllmnnbbvcxzssssdttyyjnnnvvcxyj
what’s the difference between 2o and o(subscript 2)?
Answer:
2O is an atom while O2 Is a molecule
b. If the initial pressure of gas inside the balloon was 1.65 atm, what is the new pressure?
A sample of gas kept at a constant pressure, is heated from 273 K to 373 K. If the initial volume
is 3.00 L, what is the new volume?
A container of gas is heated from 250 K to 303 K. What is the new pressure if the initial pressure
is 880 kPa?
A sample of gas at 62.0°C occupies a volume of 4.80 L at a pressure of 2.90 atm. How many moles of gas are contained in the sample?
A 0.100 mole sample of gas is at a temperature of 85.0°C and a volume of 3.47 L. What is the pressure of the gas (in mm Hg)?
Question 1 :
V1/T1 = V2/T2
3.0L/273K = V2/373K
To get the value of Z, cross multiply
3.0L x 373K = 273K x V2
1119 = 273V2
Divide both sides by 273
1119/273 = 273V2/273
4.10L = V2
The new volume is 4.10 liters
Question 2 :
P1/T1 = P2 /T2
P1 = 880 kPA= 880 *10^3 Pa
T1 = 250 K
T2 = 303 K
P2 =?
Substituting for P2
P2 = P1 T2/ T1
P2 = 880 kPa * 303 / 250
P2 = 266,640 kPa/ 250
P2 = 1066.56 kPa.
The new pressure of the gas is 1066.56 kPa
Question 3 :
Given that:
Volume of gas V = 4.80L
(since 1 liter = 1dm3
4.80L = 4.80dm3)
Temperature T = 62°C
Convert Celsius to Kelvin
(62°C + 273 = 335K)
Pressure P = 2.9 atm
Number of moles of gas N = ?
Apply ideal gas equation
pV = nRT
2.9atm x 4.8dm3 = n x (0.0082 atm dm3 K-1 mol-1 x 335K)
13.92 atm dm3 = nx 2.747 atm dm3 mol-1
n = 13.92/2.747
n = 5.08 moles
There are 5.08 moles of gas contained in the sample
Question 4 :
Volume of gas V = 3.47L
(since 1 liter = 1dm3
3.47L = 3.47dm3)
Temperature T = 85.0°C
Convert Celsius to Kelvin
(85.0°C + 273 = 358K)
Pressure P = ?
Number of moles of gas N = 0.100 mole
Apply ideal gas equation
pV = nRT
p x 3.47dm3 = 0.10 x (0.0082 atm dm3 K-1 mol-1 x 358K)
p x 3.47dm3 = 0.29 atm dm3
p = (0.29 atm dm3 / 3.47 dm3)
p = 0.085 atm
If 1 atm = 760 mm Hg
0.085atm = 0.085 x 760
= 64.6 mm Hg
The pressure of the gas is 64.6 mm hg
calculate how many seconds are in the month of april
Which energy source can be renewed in less than a week?
a ton of coal
a barrel of oil
the charge on a solar battery cell
the ethanol produced by an acre of corn
Answer:
a charge on a solar battery cell
which of the following correctly represents the radioactive decay of cesium-137?
Select the correct answer.
Beryllium (Be) and fluorine (F) combine to make the compound BeF2. What is the chemical name for this compound?
A.
beryllium fluoride
B.
beryllium fluorine
C.
beryllide fluoride
D.
beryllide fluorine
Answer:
A number is right I think
Answer:
A.
beryllium fluoride
I hope it is helpful...
PLEASE ANSWER IF ITS CORRECT I WILL MARK IT AS BRAINLIEST PLZ??
What do you think would happen if the temperature of a gas is higher than the other when applying Graham's Law? *
A) There will be no effect on the gas
B) The kinetic energy of the gas particles would increase
C) The volume of the gas particles would increase
Answer:
There will not be effect on the gas
Explanation:
I'm sure that it's correct answer
How many grams of KCl are produced if 90 g KCIO3 decomposes? *
54.75 g KCI
13.69 g KCI
27.37 g KCI
37 g KCI
Which is true of cell differentiation?
A. Tissues produce various stem cells.
B. Stem cells become different types of cells.
C. Unicellular organisms become multicellular
Answer:
B
Explanation:
When stem cells differentiate, they are different (almost like mutation).
Answer:
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20 points to anybody that can answer all 3 of these questions
Answer:
1. 2AgO2 --> 4 Ag + O2
2. Decomposition
3. 2NaBr + CaF2 --> 2NaF + CaBr2
Explanation:
