Explanation:
4.5×6.022×10²³
27.099×10²³
According to Avogadro's number, there are 27.10×10²³ atoms in 4.5 moles of Al.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole =6.023×10²³ atoms , thus,4.5 moles =4.5×6.023×10²³ = 27.10×10²³ atoms.
Thus, there are 27.10×10²³ atoms in 4.5 moles of Al.
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Which phase change is not associated with gases?
Answer: depositing
Explanation:
7. Convert 3.57 x 106 into standard (long) form.
a) 0.0000357
b) 0.000357
c) 3570000
d) 0.00000357
e) 357000
!!!!! Need this now !!!
Answer:
c) 3570000
Explanation:
The standard form is a way to simplify too long or too short numbers. Standard form uses powers of ten to contract numbers.
x × 10^n
Where;
x = decimal number between 1.0 - 10.0
n = power of 10
According to this question, a number already in standard form is given as 3.57 x 10^6.
To convert to its long form, we count forward the power of ten beginning from where the decimal is. In this case, we're counting 6 times Note that once the decimal is after 7, we start placing zero (0) instead. Based on this, we have;
3.57 x 10^6
1st count = 35.7
2nd count = 357
3rd count = 3570
4th count = 35700
5th count = 357000
6th count = 3570000
Hence, the long form of the number 3.57 x 10^6 is 3570000.
Calculate the normal freezing point of a 0.7439 mol aqueous solution of c12h22o11 that has a density of 1.35g/ml. The molal freezing point depression constant of water is 1.86 kg/mole
Answer:
Freezing point of solution = -2.740C
Explanation:
The solution is attached herewith
The normal freezing point of an aqueous solution of C₁₂H₂₂O₁₁ is -1.26°C
The freezing point depression can be calculated using the formula:
ΔTf = i* Kf*m ; where
i = van’t Hoff factorKf = freezing point depression constantm = molalility of solutionThe molality of the aqueous solution of C₁₂H₂₂O₁₁ is first determined using the formula:
molality = moles of solute/mass of water in kgThe mass of water is unknown but is determined from the mass of the solute and solution from the formula:
mass of solvent (water) = mass of solution - mass of solutemass of solute = number of moles * molar mass
moles of solute in 1 L solution = 0.7439 moles
molar mass of solute, C₁₂H₂₂O₁₁ = 342.0 g/mol
mass of solute = 0.7439 moles * 342.0 g
mass of solute = 254.41 g
mass of solution = density * volume
volume of solution = 1 L = 1000 mL
mass of solution = 1.35g/ml * 1000 mL
mass of solution = 1350 g
Therefore, mass of solvent (water) = 1350 g - 254.41 g
mass of solvent (water) = 1095.59 g
mass of solvent (water) in kg = 1095.59 g * 1 kg/ 1000 g
mass of solvent (water) in kg = 1.0956Kg
Thus, molality of solution = 0.7439 moles / 1.0956 Kg
molality of solution = 0.679 mol/kg
The freezing point depression, ΔTf, is then determined using the formula: ΔTf = i* Kf*m
Since C₁₂H₂₂O₁₁ is a non-electrolyte; i for C₁₂H₂₂O₁₁ = 1
Kf of water = 1.86 kg/mole
m = 0.679 mol/kg
ΔTf = 1 * 1.86 * 0.679
ΔTf = 1.26 °C
Therefore, freezing point depression, ΔTf = 1.26 °C
normal freezing point of solution = freezing point of water - freezing point depression
normal freezing point of solution = 0.0°C - 1.26°C
normal freezing point of solution = -1.26°C
Therefore, the normal freezing point of an aqueous solution of C₁₂H₂₂O₁₁ is -1.26°C
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When you pour 125 grams of solute into 1.25 Liters of 35 grams of crystal sink to the bottom and do not dissolve. What is the saturation point in terms of grams per liter?
Answer:
72 g/L
Explanation:
The dissolved amount of solute is the difference between the amount you have poured and the amount that precipitated:
125 g - 35 g = 90 g
Thus, 90 grams of solute were dissolved in 1.25 liters. The saturation point is the ratio between the grams dissolved and the volume in liters:
saturation point = 90 g/1.25 L = 72 g/L
can someone answer dis:
1) The atomic number of an element shows how many ___________ there are in its atoms.
thankss
I think that the answer is protons
3. If all of the predators in an ecosystem are killed off,
what happens to organisms that are their food source?
Answer:
its a little bit long but= The most obvious result of the removal of the top predators in an ecosystem is a population explosion in the prey species.More predators kill more prey, which, along with food scarcity, decreases the population. When prey becomes more scarce, the predator population declines until prey is again more abundant.
what is NaOH element
Sodium hydroxide, also known as lye and caustic soda, is an inorganic compound with the formula NaOH. It is a white solid ionic compound consisting of sodium cations Na + and hydroxide anions OH −
Which of the following would be the best caption for this image?
A
The Coriolis effect causes convection cells of air to circulate through the atmosphere.
B
The pattern of ocean currents is identical to the pattern of wind currents.
C
Uneven heating of land and water causes winds to blow in different directions during the daytime and night time.
D
There are six bands of global wind currents. These bands of wind currents are caused by convection cells created by the warming and cooling of air.
Which of these hydrocarbons is a ketone? Check all that apply.
Answer:
The answer is below
Explanation:
Ketone is a class of organic compounds which has a carbonyl group such that the carbon atom is covalently bonded to an oxygen atom, while the remaining two bonds are to other carbon atoms or hydrocarbon radicals.
Ketones are highly reactive hydrocarbons, they can be gotten from the oxidization of secondary alcohols. Ketone are used for medicinal applications.
The third option is the ketone
it’s the the last 2 choices
What is the molecular formula?
A) C₂H₂O
B) CO2
C) HCI
D) NaOH
Answer:
B) Co2 cuz in the diagram I see two similar atoms it might be of (oxygen) and the one atom of (carbon)
What happens if water or food goes down the trachea?
Nothing
the food goes to the stomach
you choke
Answer:
the food goes to your stomache.
Question 21 of 25
Which of the following are elements in this equation:
2Mg(s) + O2 (9) ► 2Mgo (s)?
Check all that apply.
A. g
B. Mg
C. O
D. S
Answer: Mg and O
Explanation: just took the test. Trust
Calculate the new temperature when a container of
gas has a pressure of 795 mm Hg at 273 K and the
pressure is lowered to 358 mm Hg.
(Gay Lussac's Law) P1T2/P2T1
- 0.00165
- 246
- 123
- 606
Answer: The new temperature of container is 123 K.
Explanation:
Given: [tex]P_{1}[/tex] = 795 mm Hg, [tex]T_{1}[/tex] = 273 K
[tex]P_{2}[/tex] = 358 mm Hg, [tex]T_{2}[/tex] = ?
Formula used to calculate the new temperature is as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}\\\frac{795 mm Hg}{273 K} = \frac{358 mm Hg}{T_{2}}\\T_{2} = 123 K[/tex]
Thus, we can conclude that the new temperature of container is 123 K.
PLS HELP ON A TIMER!
if the pressure exerted by a sample of carbon dioxide at 25° C in a volume of 0.44L is 3.81 atm, what is the mass of the carbon dioxide?
A. .0685
B. 1.65
C. 3.02
D. 14.4
Answer:
3.02
Explanation:
What is a galvanic cell made of
Answer: A galvanic cell consists of two different metals (electrodes) connected through a conducting solution (an electrolyte) and also connected externally completing a circuit.
Name the following alkane molecule:
CH3CH(CH3)CH2CH(CH3)2
A. heptane
B. 2,4,4-trimethylbutane
C. 2,4-dimethylpentane
Answer:
B
Explanation:
Just by looking at the amount of carbons on the straight chain which is four and whom prefix is butane we can see that B is the answers
Research online to find out what the acidity of the rainfall is where you live. If you live in an area which is affected by acid rain, where do you think it is coming from and why?
Write 3-5 paragraphs describing the effects.
If you do not live an area effected by acid rain, choose another city that is effected by acid rain.
Answer & Explanation: Acid rain occurs when sulfur dioxide and nitrogen oxide are released into the air to create a chemical reaction. When the two mix in the air (oxygen), they will get into the water and mix with other pollutants in the air, making acid rain.
Answer:
What is acid rain? Acid rain occurs when sulfur dioxide and nitrogen oxide are released into the air to create a chemical reaction. When the two mix in the air (oxygen), they will get into the water and mix with other pollutants in the air, making acid rain.
What causes acid rain the most? It can be caused by useing nonrenewable resources. Which inclues coal, oil, ect.
What effects can acid rain have? It causes respiratory issues in animals and humans. When acid rain falls down and flows into the rivers and ponds it affects the aquatic ecosystem. It alters the chemical composition of the water, to a form which is actually harmful to the aquatic ecosystem to survive and causes water pollution which can harm our fresh water supply.
What is the total pressure of a gas mixture containing partial pressures of
0.23 atm, 0.42 atm, and 0.89 atm?
A. 1.54 atm
B. 0.89 atm
C. 0.42 atm
D. 0.51 atm
SUBM
Answer:
1.54 atm
Explanation:
By Dalton's Law Of partial pressure,
Total Pressure = Sum of all partial pressures
So,P= P1 + P2 + P3
Therefore, P=0.23+0.42+0.89
=1.54 atm
A gas occupies a volume of 10 liters at a pressure of 0.5 atm. What is the pressure if the volume increases to 25.0 L? *
A.0.4 atm
B.0.3 atm
C.0.2 atm
D.0.1 atm
Answer:
0.2atm
Explanation:
By Boyle's law
P1V1=P2V2
0.5 x 10 = P2 x 25
therefore, P2= 0.2atm
Limitations definition
Answer:
a limiting rule or circumstance; a restriction.
Example:
Also knowing her limitations, she'd declined the invitation to join them
eeeeeeeeeeeeeeeeeeeeeeeeeeeee
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
Have a nice day!
Answer:
1. Closest
2. Million
3. All
4. Sunlight
5. Heat
6. Are
7. Faster
8. Million billion
9. Protection
10. Moon
11. Never
12. Tiny
13. Living
14. Explosions
15. Solar
give the other person brainliest
have a good day :)
Explanation:
Select the correct structure that corresponds to the name. 2, 2, 3-tribromopentane
Answer: A
Explanation:
The structure that corresponds to the name. 2, 2, 3-tribromopentane is the first one. option A is correct.
What is 2, 2, 3-tribromopentane?In 2, 2, 3-tribromopentane structure the organic compound consists of 5 charbon chains which all are attached with a single bond to each other and there are 2 bromines attached at the second number of carbon and the last one is attached at the third number of carbon.
Five carbons in the organic compound which all are bounded with a single bond with each other are named pentane and bromine is a functional group attached to the second and third carbon.
This system of the naming of organic compounds was introduced by the international union of pure and applied chemistry. this organic compound is also named based on this system of IUPAC culture.
Therefore, option A is correct.
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What are the two limitations of earth plates
Answer:
The tectonic style and viability of modern plate tectonics in the early Earth is still debated. Field observations and theoretical arguments both in favor and against the uniformitarian view of plate tectonics back until the Archean continue to accumulate. Here, we present the first numerical modeling results that address for a hotter Earth the viability of subduction, one of the main requirements for plate tectonics. A hotter mantle has mainly two effects: 1) viscosity is lower, and 2) more melt is produced, which in a plate tectonic setting will lead to a thicker oceanic crust and harzburgite layer. Although compositional buoyancy resulting from these thick crust and harzburgite might be a serious limitation for subduction initiation, our modeling results show that eclogitization significantly relaxes this limitation for a developed, ongoing subduction process. Furthermore, the lower viscosity leads to more frequent slab breakoff, and sometimes to crustal separation from the mantle lithosphere. Unlike earlier propositions, not compositional buoyancy considerations, but this lithospheric weakness could be the principle limitation to the viability of plate tectonics in a hotter Earth. These results suggest a new explanation for the absence of ultrahigh-pressure metamorphism (UHPM) and blueschists in most of the Precambrian: early slabs were not too buoyant, but too weak to provide a mechanism for UHPM and exhumation.
Explanation:
What is one service humans receive from the environment AND one-way humans disrupt ecosystems? (These need to be related!)
Answer:
Land-use change: Humans may destroy natural landscapes as they mine resources and urbanize areas. This is detrimental, as it displaces residing species, reducing available habitats and food sources. ... This can negatively effect an ecosystem because the introduced species may outcompete native organisms and displace them.
Explanation:
What molar concentration (molarity) results when 1.28 L of 14.38 M HCl is diluted to 9.45 L of water?
Answer:
1.95 M
Explanation:
Molarity is a measure of the molar concentration of a substance (solution). In relation to the volume, it is calculated using the formula as follows;
C1V1 = C2V2
Where;
C1 = initial concentration (M)
C2 = final concentration (M)
V1 = initial volume (L)
V2 = final volume (L)
According to the provided information in this question;
C1 = 14.38 M
C2 = ?
V1 = 1.28 L
V2 = 9.45 L
Using C1V1 = C2V2
14.38 × 1.28 = C2 × 9.45
18.4064 = 9.45 C2
C2 = 18.4064 ÷ 9.45
C2= 1.95 M
Give an example of a metal and a nonmetal you use in everyday life.
Answer:
A type of metal I use everyday in life in using the iron door knob on my doors.
A nonmetal I use everyday is chlorine for when I need to clean my pool.
Explanation:
Is this your intention?
1
How are reflecting telescopes different from refracting
telescopes?
A
Reflecting telescopes need light sources; refracting
telescopes don't
B ;
Reflecting telescopes magnify objects; refracting
telescopes minimize them
C Reflecting telescopes magnify
objects in outer
space;
D Reflecting telescopes use mirrors to collect light;
Answer:
b.
Reflecting telescopes use mirrors to collect light; refracting telescopes use lenses
Explanation:
2. Which has the higher boiling point: Explain each choice. (Reminder-the more ions -
the more roadblocks for the solvent)
C. .100 m KCL or .100 m MgCl2
Answer:
100 m of KCL
Explanation:
This is because it is a more reactive metal and higher in the electro reactivity series which lead us to believe that it will take a longer time to heat along with the fact that it is lower in the periodic table and is a metal
A
region that has a specific
climate and a specific
community of plants and
animals
Answer: A biome is part of the biosphere. Biomes can influence each other. terrestrial biomes
Explanation:
Which formula can represent an alkyne? *
O
1. C2H4
O
2. C2H6
O
3. C3H4
O
4. C3H6
the answer is (3). C3H4
Explanation :
C3H4 is propyne.
The formula that can represent an alkyne is 3. C3H4.
What are alkynes?Alkylnes are organic compound and unsaturated hydrocarbons which is formed by carbon-carbon triple bond.
The triple bonds that are fromed between carbon are one alpha and two sigma bonds.
Thus, the correct option is 3. C3H4
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