Answer:
Explanation:An age-structure diagram provides a snapshot of the current population and can represent information about the past and give potential clues about future problems. When you are interpreting age-structure diagrams, it is important to compare the width of the base to the rest of the population
(Please Help!) Aluminum reacts with oxygen to produce aluminum oxide (AI203). The balanced chemical equation for this reaction is: *see attachment*
How many oxygen atoms are in the reactants and in the products?
Why does the reaction of aluminum with oxygen illustrate the law of conservation of mass?
#1
Moles of Oxygen =3
Molecules:-
3×Avagadro no3(6.022×10²³)18.066×10²³1.8066×10²²molecules#2
Its because according to law of conservation of mass- Mass is neither created nor destroyed
AS ITS BALANCED SO BOTH SIDES ARE SAME .
HENCE THEY OBEY
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
As per the given reaction, we can clearly observe that :
#1. How many Oxygen atoms are there in reactant and product side ?
- The number of Oxygen atoms is same as in reactant Side and product side, that is 6 atoms ~
#2. How does the reaction illustrate the law of conservation of mass ?
- According to law of conservation of mass, mass can neither be created nor be destroyed in a chemical reaction. so the mass of each element on reactant Side should be equal to that in the product side.
Now, let's check out if it's true for the given reaction ~
Mass on reactant side :[tex]\qquad \sf \dashrightarrow \: 4(27) + 3(32) = 2 \{(2 \sdot27) + (3 \sdot16) \}[/tex]
[tex]\qquad \sf \dashrightarrow \:108 + 96= 2 \{54+ 48\}[/tex]
[tex]\qquad \sf \dashrightarrow \:204= 2 \{102\}[/tex]
[tex]\qquad \sf \dashrightarrow \:204= 204[/tex]
Hence, it's verified ~ that it follows law of conservation of mass ~
Energy is gained or removed to break chemical bonds?
Answer:
it is removed In all types of chemical reactions, bonds are broken and reassembled to form new products. However, in exothermic, endothermic, and all chemical reactions, it takes energy to break the existing chemical bonds and energy is released when the new bonds form.
Explanation:
hope this helps if not let me know have a blessed day
Answer:
I don't now the answer but you can give branaillest to the other person how answered it
Explanation:
On the fahrenheit scale, at what temperature does water boil? a. 451°f b. 264°f c. 212°f d. 100°f
The temperature that water boils on the fahrenheit scale is c. 212°f.
What is Temperature conversation?Temperature conversation is a way of converting a temperature from a unit to another using conversation scale.
Therefore, on fahrenheit scale water boils at 212°f which is equivalent to 100°C on the Celcius scale.
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which subatomic particle accounts for magnetism ?
Answer:
Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom. Their movement generates an electric current and causes each electron to act like a microscopic magnet
Explanation:
trust me
What is the critical angle for total internal reflection at the water-ice interface?
The value of the critical angle for total internal reflection at the water-ice interface is 48.6 degrees.
What is critical angel?The greatest angle at which a beam of light traveling through one transparent media can strike the border between that medium and a second of lower refractive index without being completely reflected within the first medium is called the critical angle in optics.
So the value of the critical angle for total internal reflection at the water-ice interface is 48.6 degrees.
Hence the resultant critical angel is 48.6 degrees.
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Describe the importance of the water cycle in the terms of;
i.improving water table
ii. regulating weather patterns
iii.provision of clean water
Answer:
ii.
Explanation:
Regulating weather patterns
Who developed the concept that the total pressure of a mixture of gases is the sum of their partial pressures?.
Answer:
John Dalton
Explanation:
John Dalton developed the concept tittle: Dalton Law of Partial Pressure.
The formula is: Pt = Pa + Pb + Pc...... Pn
Elements that are shiny and are good conductors of electricity are:
a. Non-metals
b Metals
c. Halogens
d. Compounds
Answer:
Metals
Explanation:
The condensed formula, CICH2CHCl2,
represents:
Please help asap
Answer:
Option B
Explanation:
The given alkyl chloride having molecular formula ClCH2CHCl2, have IUPAC name 1,1,2 - trichloride ethane which can be represented in structural formula as shown in Option B, where the right carbon atom receives lower integer in numbering i.e. 1 and on the first carbon atom because it have two Chlorine atoms, and second carbon atom is numbered 2, having one Chlorine substituent on it.
Another reason for option A is incorrect answer, because the number of atoms in molecular formula & number of atoms in structural formula ain't same, in molecular formula there is a -CH2- & a -CH- substituent present, but in option A both the carbon atoms are -CH2- bonded to each other with chloride linkage.
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Answer:
Option B
Explanation:
The structural formula Cl-CH₂-CH-Cl₂ represents the compound 1,1,2 - trichloride ethaneOption A represents a different compoundOption B correctly represents the structure with respect to the structure and arrangement of atomsA weather balloon was initially at a pressure of 0.900 atm, and its volume was 35.0 L. The pressure decreased to 0.750 atm, without loss of gas or change in temperature. What was the change in the volume?
Boyle's Law
P₁V₁=P₂V₂
0.9 x 35 = 0.75 x V₂
V₂ = 42 L
Will the presence of a dissolved substance affect the solubility of another?
Answer:
The solubility mainly depends on the composition of solute and solvent (including their pH and the presence of other dissolved substances) as well as on temperature and pressure.
Explanation:
How many gram of oxygen gas are produced from 6.0 mols of carbon dioxide?
Answer:
From the mole ratio of the gases, 10 moles of hydrogen will produce 10 moles of water, and if 10.0 L of hydrogen and 6.0 L of oxygen were used, 10.0 L of water will be produced.
What is the mole ratio of reactants in the formation of water?
The mole ratio of the reactants in the formation of water can be shown from the equation below:
Mole ratio of hydrogen to oxygen is 2:1
10 moles of hydrogen will require 5 moles of oxygen, therefore hydrogen is the limiting reactant.
10 moles of hydrogen will produce 10 moles of water.
1 mole of a gas has a volume of 22.4 L.
If 10.0 L of hydrogen and 6.0 L of oxygen were used, 10.0 L of water will be produced.
Therefore, the volume ratio of gas equals mole ratio of gas
Explanation:
Answer: 192g O2
Explanation:
Balanced equation
S + O2 → SO2
1mol O2 produces 1 mol SO2
6mol O2 required to produce 6 mol SO2
Molar mass O2 = 32g/mol
Mass of 6 mol O2 = 6*32 = 192g O2 required.
Question 10 of 25
According to the phase diagram for H20, what happens to the phases of
water at 0.5 atm pressure as the temperature is decreased from 110°C to -10
C?
Water
(liquid)
Pressure (atm)
1-
0.5-
0.25
Ice
(solid)
Water vapor
(gas)
0
270.01
-10
100
Temperature (°C)
A. Water changes from a solid to a liquid to a gas,
B. Water changes from a liquid to a gas to a solid.
C. Water changes from a gas to a solid to a liquid.
D. Water changes from a gas to a liquid to a solid.
Answer:
A. Water changes from a solid to a liquid to a gas.
Explanation:
A gas occupies a volume of 50.0mL at 27°C and 630mmHg. At what temperature, in C°, would the pressure be 101.3kPa if the volume remains constant? 5. A sample of gas is initially at STP. What would the pressure be if the temperature were increased to 819°C?
Answer:
Explanation: pls read what i wrote i don't know if it's correct but i just tried to solve it
If the volume at 110.0kPa is 524cm 3 , what will the new volume be if the pressure is changed to 104.5kPa?
By applying Boyle's law, the new volume of this ideal gas is equal to 551.58 cm³.
Given the following data:
Initial volume = 524 cm³.New pressure = 104.5 kPa.Initial pressure = 110.0 kPa.How to calculate the new volume?In order to determine the new volume of this ideal gas, we would apply Boyle's law.
Mathematically, Boyle's law is given by this formula:
PV = k
P₁V₁ = P₂V₂
Where:
P represents the pressure.V represents the volume.Making V₂ the subject of formula, we have:
V₂ = (P₁V₁)/P₂
Substituting the given parameters into the formula, we have;
V₂ = (110.0 × 524)/104.5
V₂ = 57,640/104.5
V₂ = 551.58 cm³
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Limitation for osmosis experiment
express your opinion against the theory of evolution
Answer:
The Theory of Evolution
Explanation:
it had many struggles but think of how we grew I agree with the theory of evolution because it has shown that studies of animals were here before humans
Which of the following is a solution?
A)
milk
B)
salt water
C)
chlorine
D)
muddy water
Explanation:
b. salt water is the correct answer
Which of the following is a solution?
A) milk
B) salt water
C) chlorine
D) muddy water
✭ Explanation -:What is a solvent ?
A liquid that can dissolved in a solution.
What is a solute ?
A substance that is dissolved in a solution.
What is a solution ?
A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
Opition a)
Milk is not a solution. Milk is a mixture because milk has more than one phase suspended in it. Milk is a mixture of water, lipids, fats, proteins, and carbohydrates, as well as other substances.
Opition a is not the correct answer
Opition b)
Salt water is a solution. It is a solution because salt particles completely dissolve in water.
Opition b is the correct answer
Opition c)
Chlorine gas is an element. An element is a pure substance that consists of only one type of particle.
Opition d)
Muddy water is not a solution.It is a mixture. Solid dust and liquid have been mixed but the two but the two are not mixed on a molecular scale to form one state.
Opition d is not the correct answer
Hence Opition b) is a solution.What is the molarity of a solution prepared by dissolving.
Answer:
The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters.
If the density of a gas is 1. 2g/l at 745 torr and 20 c what is the molar mass
If the density of a gas is 1.2g/l at 745 torr and 20 degree C, then the molar mass of gas is 30 g/mole.
What is ideal gas equation?Ideal gas equation gives idea about the behavior of gas at different condition & represented as:
PV = nRT, where
P = pressure = 745 torrV = volume = 1Ln = moles = ?R = universal gas constant = 62.36 L.Torr / K.molT = temperature = 20 degree C = 293KOn putting all these value in the above equation, we get moles
n = (745)(1) / (62.36)(293) = 0.04 mole
Molar mass will be calculate by using the below equation:
M = W/n, where
W = given mass = 1.2gn = moles = 0.04 molM = 1.2 / 0.04 = 30g/mol
Hence required molar mass of gas is 30g/mol.
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Plssssss helppppp
branliest
write the balanced complete ionic equation for the reaction when ammonium carbonate and calcium chloride are mixed in aqueous solutionif no reaction occurs, simply write only nr.
convert 0.876 atm to mmHg. solution: multiply the atm value by 760.0 mmHg/ 1.0 atm 0875 atm x _______ = _______ mm Hg (3 sig figs)
[tex]\tt \dfrac{760~mmHg}{1~atm}\times 0.876~atm=665~mmHg[/tex]
The first-order rate constant for the decomposition of n2o5,2n2o5(g)→4no2(g) o2(g)at 70∘c is 6. 82×10−3 s−1. Suppose we start with 2. 60×10−2 mol of n2o5(g) in a volume of 2. 0 l
A decomposition reaction is the breakdown of reactants into two or more products. The concentration of dinitrogen pentoxide after 4 minutes will be 1.63 moles.
What is the first-order rate constant?The first-order rate constant (k) is the order of the reaction that is the initial rate and is given as 1/s.
The first order is shown as:
[tex]\rm [ln] A = \rm ln [A]_{o} - kt[/tex]
Given,
Initial concentration = 0.013 M
k = [tex]6.82 \times 10^{-3}\;\rm s^{-1}[/tex]
t = 240 seconds
Substituting values above:
[tex]\begin{aligned} \rm [ln] A &= \rm ln[0.013] - 9 6.82\times 10^{-3} \times 240)\\\\[A] &= \rm e^{ln[0.013]} - (6.82 \times 10^{-3} s^{-1} \times 240 s)\\\\& = 1.6238\end{aligned}[/tex]
Therefore, 1.63 moles will remain after 4 minutes.
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CH2Br
The bond line formula,
represents the molecular formula
Br
A
B
CH₂ Brz
CH₂ Brz
Answer: C7H6Br2
Explanation:
i got it right on acellus
Which unit is used for specific heat capacity?
Answer:
J/gm-C
Explanation:
J/gm-C is one set of units for specific heat
Snow that falls on the ground melts slowly. Snow that falls on Stefan’s nose melts very
quickly.
Give a reason for this.
______________________________________________________________________________
Answer:
because Stefan's nose is so warmer than the ground.
ground have a same temperature like air but nose of human have maybe 32°C.
When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.
Snow that falls on the ground melts slowly. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground. Ground have a same temperature like air but nose of human may have 32°C.
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Is the dissolution of borax in water a temperature dependent reaction or is it spontaneous at all temperatures at which water is liquid? briefly explain
The dissolution of borax in water is a temperature dependent reaction. With the higher temperature, the salt dissolve quickly.
What is borax?
Borax is the hydrate salt of boric acid. It is white and widely used in cleaning and in laundry detergent.
Borax is a salt that will dissolve in water at almost any temperature, with the exception of steam and ice.
However, as with any salt, the higher the temperature, the faster the salt dissolves, so speed is dependent on temperature. It will dissolve in cold water, but it will take longer.
Thus, the dissolution of borax in water is a temperature dependent reaction.
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Can someone solve this concept map for me
Filling that table
#Solid in liquid
gelatin#solid in a gas
Camphor in Nitrogen gas#Gas in a liquid
Oxygen in water#Solid in a liquid
Sugar solution#Liquid in gas
Chloroform in NitrogenThe initial movement of groundwater into the atmosphere to form clouds is due to A) air currents causing evaporation. evaporation caused by solar radiation. condensation due to a drop in temperature. decreasing temperatures at higher altitudes. B) C D)
The initial movement of groundwater into the atmosphere to form clouds is due to evaporation caused by solar radiation.
What is evaporation?Evaporation is the process by which a liquid spontaneously turns to vapor as a result of temperature increase.
Ground water moves from the ground to the atmosphere when the radiant heat from the Sun turns liquid water to vapor.
Therefore, the initial movement of groundwater into the atmosphere to form clouds is due to evaporation caused by solar radiation.
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At what speed does every type of electromagnetic radiation travel?
Answer:
All waves of the electromagnetic spectrum have a speed of 3 × 10⁸ ms⁻¹