Answer:
V₂ = 457.49 mL
Explanation:
Given that,
Initial volume, [tex]V_1=543\ mL[/tex]
Initial temperature, [tex]T_1=75^{\circ} C=75+273=348\ K[/tex]
Final temperature, [tex]T_2=20.2^{\circ} C=20.2+273=293.2\ K[/tex]
We need to find the final volume of the gas. The relation between the volume and the temperature of the gas is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Put the respected values,
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{543\times 293.2}{348}\\\\V_2=457.49\ mL[/tex]
So, the final volume of the gas is equal to 457.49 mL.
what is the difference between the mitochondria and the excretory system?
Answer:
Mitochondria is a membrane-bound organelle stored in cells and their function is to generate chemical energy to power the cell's biochemical reaction.
The excretory system is an organ system that eliminates wastes, prevents harmful accumulation of chemicals in the body, and maintains the body's chemical concentration.
Explanation:
Gas A has a partial pressure of 6 atm. Gas B has a partial pressure of 2 atm.
What is the partial pressure of Gas C, if the total pressure of the combined
gases is 10 atm?
Answer:
2 atm
Explanation: add both partial pressures and subtract from total pressure
A gas occupies 900.0 mL at a temperature of 300K. What is the volume at 132.0 °C?
who can help me this please
choose the correct answer
Answer:
number
Explanation:
2 is right
2. What is the percent composition by mass of potassium in KBr?
What is plotted on the Y axis
Speed
Distance or time
We have observed evidence that when M-NM compounds are dissolved, the metal particles tend to form positively charged ions (cations), while non-metal particles tend to form negatively charged ions (anions).
a. True
b. False
Answer:
a. True
Explanation:
From Thomson's Plum Postulate on Pudding model of an atom, he posits that particle includes electrons that are encircled by a circle of positive charge to adjust the negative charges of electrons, which is fundamentally the same as way like negatively charged "plums" is getting encased by positively charged pudding.
Hence, the above statement is true.
the lungs are covered with a thin layer called ________
interstitium
#keeponlearning
Answer:
pleura
Explanation:
The lungs are covered by a thin tissue layer called the pleura. The same kind of thin tissue lines the inside of the chest cavity -- also called pleura.
Explain whether chromium is more or less reactive than aluminium.
Answer: Chromium is less reactive as compared to Aluminium as it can not easily electrons as aluminium.
Explanation:
The arrangement of metals in a series according to the decreasing order of their reactivity is called reactivity series.
The metals that are placed above hydrogen are more reactive and those below hydrogen are less reactive.
A metal placed above another metal can displace lower metal from its salt solution. Thus a metal placed above in series is more reactive than metals placed below it.
As aluminium can easily lose electrons as compared to chromium , it is more reactive than Chromium.
__H2 + __O2 --> __H2O
If 42.3 moles of water are produced, how many moles of hydrogen gas was reacted?
Answer:
42.3moles
Explanation:
The chemical equation given in this question is as follows:
H2 + O2 → H2O
However, this equation is unbalanced, the balanced chemical equation is as follows:
2H2 + O2 → 2H2O
This equation shows that;
2 moles of hydrogen gas (H2) will produce 2 moles of water (H2O)
Hence, If 42.3 moles of water (H2O) are produced, 42.3 × 2/2
= 42.3moles of hydrogen was reacted.
PLEASE HELP ME
2. In the cause and effect chart below, decide whether the cause makes a chemical reaction speed up or slow down. Circle the correct answer.
Answer:
speeds up, slows down, slows down, speeds up, slows down
Help me answer this chemistry question. thank you!
Answer:
A. Inflation pressure of the tyres
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to induce a response in another variable called Dependent variable.
In this case in which an experiment was conducted on how inflation pressure of tyre affects a vehicle's maximum speed. The tyres of three different vans were used. The tyre of the first van were set at normal pressure of 35psi, the other van tyres were set at 40psi (overinflated) and 30psi (underinflated) respectively. This means that the INFLATION PRESSURES OF THE TYRES were the variable being changed, hence, is the INDEPENDENT VARIABLE.
Why would a scientist want to measure force in dyne?
Answer:
Dyne is a force wee need it
Explanation:
How many atoms are in 5.40 moles of Copper, Cu?
a. 63.55
b. 8.97x10^-24
c. 5.12x10^22
d. 3.25x10^24
3.25 × 10²⁴ atoms are present in 5.40 moles of Copper, Cu.
Thus, option D is accurate.
What is mole?A mole is a measurement of quantity. A fixed amount of something is represented by 1 mole.
Objects with dimensions on the atomic scale are counted using this unit.
According to formal definition, one mole of a substance has the same number of particles as atoms in a 12-gram sample of carbon-12.
Mole of Copper (n) = 5.40 mol (Given)
We know that, one mole of particle contains Nₐ= 6.022 × 10²³ mol⁻¹ number of particles. (Nₐ stands for Avogadro's Number)
Thus, the number of atoms in n = 5.40 mol of copper is:
N = Number of Moles × Number of molecules per mole
N = 5.40 mol × 6.022 × 10²³
N = 3.25 × 10²⁴
Thus, 5.40 moles of Copper, Cu contains 3.25 × 10²⁴ atoms.
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13 POINTS AND BRAINIEST!!!!
How many moles of ethanol, C2H5OH are need to prepare a 25 m solution using 1200 g water?
Answer:
30 moles of ethanol are needed to prepare a 25 m solution, using 1200 g of water
Explanation:
This a short problem of solutions:
Our solute is ethanol: C₂H₅OH
Our solvent is water-
25 m, is our solution's concentration. m means molality (moles of solute contained in 1kg of solvent).
Our solvent mass is 1200g. We convert them to kg
1200 g . 1kg / 1000g = 1.2 kg
m = mol/kg → mol = m . kg
mol = 25 mol/kg . 1.2kg →30 moles
Similarities between manner of death and cause of death
Answer:
The cause of death is the specific injury or disease that leads to death. The manner of death is the determination of how the injury or disease leads to death.
Explanation:
.
Describe what each component of the Currents Tank Investigation represents.
In the Currents Tank Investigation,
a. the water represents
b. the sides of the tank represent
c. blowing through the straw represents
d. the moving pepper helps illustrate the movement of
1. currents
2.prevailing winds
3.the ocean
4.continents
Answer:
a. the water represents -- 3.the ocean
b. the sides of the tank represent -- 4.continents
c. blowing through the straw represents --- 2.prevailing winds
d. the moving pepper helps illustrate the movement of -- 1. currents
Explanation:
According to the amounts mentioned in the current talks investigation the ocean is represented by the water, the sides of the tanks are represented by the continents. The blowin of the straw illustrates the prevailing winds in the eastern ad western direction and the moving pepper shows the movment of ocean currents.You have 45.2 liters of SO2. This would be equal to
grams of S02
• Use ROUNDED masses from the periodic table in your calculations
• Answer can ONLY include numbers, no units
• Answer should be 3 digits (no decimals)
Answer:
you speak spanish
speak spanish
Magnesium and bromine react to produce magnesium bromide. What is the balanced chemical equation for this reaction?
Answer:
MgBr2
Explanation:
On the periodic table, Magnesium has 2+ charge and Bromine has -1 charge.
You cross charges and get MgBr2
Magnesium and bromine react to produce magnesium bromide. The balanced chemical equation for this reaction is Mg + Br[tex]_2[/tex] [tex]\rightarrow[/tex] MgBr[tex]_2[/tex].
What is balanced equation?An equation for just a chemical reaction is said to be balanced if both the reactants as well as the products have the same number of atoms and total charge for each component of the reaction. In other words, both side of the reaction have an equal balance of mass and charge.
This is accomplished by altering the compounds' coefficients. In this example, the subscripts (tiny numbers towards the outside of some elements, including iron and oxygen) are never altered. Magnesium and bromine react to produce magnesium bromide. The balanced chemical equation for this reaction is Mg + Br[tex]_2[/tex] [tex]\rightarrow[/tex] MgBr[tex]_2[/tex].
Therefore, the balanced chemical equation for this reaction is Mg + Br[tex]_2[/tex] [tex]\rightarrow[/tex] MgBr[tex]_2[/tex].
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3.
Violent downdrafts that are concentrated in one local area are
a. downdraft cells.
c. downbursts.
b. downstrokes.
d. updrafts.
Answer:
They are called downbursts.
what is Newton first law
Answer:
law of inertia hope it helps
where do these all go?
Answer:
The one inside with "+"--- Protons
The grey ones inside--neutrons
The ones on the electron orbits---electron
Everything is called an atom
Explanation:
Could a copper metal container be used to store a solution of silver nitrate
Answer:
a
Explanation:
because that is .y answee
One solution contains 14.9 g KCl in exactly 10 mL of solution. What is the molarity of the solution? molar mass KCI = 74.5 g/mol
Answer:
20
Explanation:
Please answer will give brainiest!
Answer:
V2O5 + 5CaS → 5CaO + V2S5
1. If you have 1.505 X 10^24 atoms of oxygen in glucose (C1,0), how many grams
of glucose do you have ?
Answer:
[tex]75.04gC_6H_{12}O_6[/tex]
Explanation:
Hello!
In this case, since one mol of any atom is related via the Avogadro's number and each mol of glucose has 6 moles of atoms of oxygen, it is possible to obtain the moles of glucose as shown below:
[tex]1.505x10^{24}atomsO*\frac{1molO}{6.022x10^{23}atoms O}*\frac{1molC_6H_{12}O_6}{6molO}\\\\=0.4165 mol C_6H_{12}O_6[/tex]
Thus, since the molar mass of glucose is 180.15 g/mol, the mass turns out to be:
[tex]0.4165mol*\frac{180.15g}{1mol} \\\\=75.04gC_6H_{12}O_6[/tex]
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BRAINLIEST IF ANSWERED CORRECTLY WITH EXPLANATION! HELP PLEASE:)
First question
[tex]Pb(NO_3)_2 + KI \rightarrow PbI_2 + KNO_3[/tex]
Balaneced:
[tex]Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3[/tex]
Find how many moles potassium iodide it is in 345.0 grams
[tex]n_{KI} = \frac{345.0 \ g}{166.0 \ g/mol} = 2.078 \ mole[/tex]
Find how many moles potassium nitrate there is for 2.078 moles [tex]KI[/tex]
[tex]n_{KNO_3} = \frac{2}{2} \cdot n_{KI} = 2.078 \ mole[/tex]
Find how many grams potassium nitrate there is in 2.078 moles [tex]KNO_3[/tex]
[tex]m_{KNO_3} = 2.078 \ mol \cdot 101.1 \ g/mol = 210.1 \ g[/tex]
Second question
[tex]yield \ \% = \frac{experimental}{theoretical} \cdot 100 = \frac{195.3 \ grams}{210.1 \ grams} \cdot 100 = 93.0 \ \%[/tex]
endothermic and exothermic would appreciate the help
Answer:
Explanation:
In general, formation of bonds is always exothermic and bond breaking is always endothermic. In the methane-oxygen combustion reaction bonds in the reactants methane and oxygen are broken (endothermic) and bonds in carbon dioxide and water are formed (exothermic). One rule to keep in mind about all reactions whether overall energy change is endothermic or exothermic is that for the product compounds to form they must move to a lower energy level than the reactants. This will always translate into stronger bonds in the product compounds than the reactant compounds, otherwise the reaction would not occur.
Now, please understand that the energy lost on formation of each product compound (exothermic) is not the same as the 'overall' energy change of a reactions. Products form from elements with atomic structures ready to bond. The following diagram may be of interest in that it shows breaking of reactant bonds to push the elements into atomic states followed by bond formations to give product compounds.
CH₄ + 2O₂ => CO₂ + 2H₂O
↓ (endo) ↑(exo)
··C·· + 4H· + 4·:O:· <= (elements in atomic form ready to bond)
The above diagram refers to element to element interactions. The overall energy change of the reaction may be endothermic or exothermic. The combustion reactions are overall exothermic but the interaction of elements is endothermic for breaking reactant bonds and exothermic for formation of product bonds.
=> Sure hope this helps, but let me know if you need more explanations.
What is the total number of atoms in a 75 g sample of zinc?
Which is one factor that increases the speed of a sound wave? A. higher temperature B. lower temperature C. traveling in a liquid rather than a solid D. traveling in a gas rather than a liquid
Answer: c
Explanation: