Answer:
Empirical formula is C₂H₄O
Explanation:
We assume, the compound is an ideal gas, so we apply the Ideal Gases law, to determine the moles:
P . V = n . R . T
We convert T° → 25°C + 273 = 298K
0.420 atm . 2L = n . 0.082 . 298K
n = (0.420 atm . 2L) / (0.082 . 298K) → 0.0343 moles
This moles are 3.023 g, so now, we can confirm the molar mass:
3.023 g / 0.0343 mol = 87.9 g/mol ≅ 88 g/m
Centesimal composition is: 54.52 % of C, 9.17 % of H, 36.31% of O.
100 g of compund are contained in: 100 g . 1mol / 87.9g = 1.14 moles
We state the moles of each element:
54.52 g / 12g/mol = 4.5 mol of C
9.17 g / 1g/mol = 9.17 mol of H
36.31 g / 16 g/mol = 2.3 moles of O
Then, we state:
In 1.14 moles of compound we have 4.5 moles of C
In 1 mol we may have (4.5 / 1.14) = 3.94 moles of C → 4C
In 1.14 moles of compound we have 9.17 moles of H
In 1 mol, we may have (9.17 / 1.14) = 8.04 moles of H → 8H
In 1.14 moles of compound we have 2.3 moles of O
In 1 mol we may have, (2.3 / 1.14) = 2 moles of O
Molecular formula is C₄H₈O₂
We confirm it by the molar mass: 12 g/m . 4 + 1g/m . 8 + 16g/m . 2 = 88g/m
Empirical formula will be (with the lowest subscripts) → C₂H₄O
Is a pencil a compound or an element and is a pencil heterogeneous or homogeneous
Answer:
Pencil is an element and a heterogeneous mixture
Explanation:
2. All elements are composed of extremely small particles called
Answer:
Atoms
Explanation:
Gaseous phosphorus pentachloride decomposes to gaseous phosphorus trichloride and chlorine at a temperature where K= 1.0x10^-3 mol/L. Suppose 2.0 mole of phosphorus pentachloride in a 2.0-L vessel is allowed to come to equilibrium. Calculate the equilibrium concentrations of all species.
Answer:
[PCl₃] = 0.031M
[Cl₂] = 0.031M
[PCl₅] = 0.969M
Explanation:
Based on the reaction:
PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)
Keq is defined as:
Keq = 1.0x10⁻³ = [PCl₃] [Cl₂] / [PCl₅]
Where [] are equilibrium concentrations of each species
Inital [PCl₅] = 2.0mol / 2.0L = 1M.
In equilibrium:
[PCl₃] = X
[Cl₂] = X
[PCl₅] = 1M-X
Where X is reaction coordinate
Solving for X in Keq:
1.0x10⁻³ = [X] [X] / [1-X]
1.0x10⁻³ - 1.0x10⁻³X = X²
1.0x10⁻³ - 1.0x10⁻³X - X² = 0
X:
X = -0.032M. False solution, there is no negative concentration
X = 0.031M
That means equlibrium concentrations are:
[PCl₃] = 0.031M
[Cl₂] = 0.031M
[PCl₅] = 1-0.031M = 0.969M
[PCl₃] = 0.031M[Cl₂] = 0.031M[PCl₅] = 0.969MWhat is the product of the unbalanced combustion reaction below?
Answer: A
Explanation:
Answer:
C
Explanation:
because the combustion reaction produce vapor water and CO2
GENERAL QUESTIONS 14 Which group tends to form 1 ions ________________________________________________ 15 Which group tends to form 2 ions ________________________________________________ 16 Which group tends to form 1 ions __________________________________________________ 17 Which group tends not to form ions or react _________________________________________
Explanation:
Which group tends to form 1+ ions;
This is the group 1 elements. They easily lose their one valence electron to achieve a table octet configuration. Also known as Alkali metals
Which group tends to form 2+ ions;
This is the group 2 elements, also known as alkali earth metals.
Which group tends to form 1- ions;
This is the group 7 elements. They gain one electron to achieve an octet configuration. They are the Halogens
Which group tends not to form ions or react;
This is the group 8 elements also known as the Noble gas elements. They already have a stable octet configuration so there's no need to react or form ions.
Which combination of variables will make an experiment the most reliable? A. Once controlled variable and many experimental variables. B. Two controlled variables C. Two experimental Variables D. One dependent variable and one experimental variable
Answer:
D. One dependent variable and one experimental variable
Explanation:
The experimental variable is defined as an independent variable which can be manipulated during an experiment in order to find out its impact or influence on the dependent variable.
The dependent variable refers to a variable that changes when an experimental or independent variable is manipulated.
Every experiment must have at least one experimental variable and one dependent variable in order to yield any meaningful result.
Which acid-base imbalance results in excretion of carbon dioxide by the lungs in a compensatory attempt to raise pH levels
Answer:
The acid base imbalance would be metabolic acidosis.
Explanation:
Metabolic acidosis is a systemic failure that can occur from various causes, from an uncompensated diabetic with an excess of ketone bodies in the blood, to poisoning with CO2.
This is regulated and compensated by the respiratory system that seeks to eliminate CO2 through the respiratory tract in order to increase the alkalinity of the blood.
This system is highly accompanied by renal aid that is responsible for excreting acid metabolites and retaining fluids for the dissolution of acidosis.
On the other hand, in patients who suffer from this systemic failure, it will be noticed as a very characteristic symptom of hypercapnia and hyperventilation, since the respiratory system is in charge of increasing the frequency to quickly decrease this acidosis and that the low blood pH do not denature the proteins critical to vital signs.
Compare and contrast protons and neutrons. Use A.C.E.
A= Answer
C= Cite Evidence
E= Expand
What is the completed balanced reaction for the replacement Al×H2SO4
Answer:
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)
Explanation:
Let's consider the unbalanced equation for the single replacement reaction between Al and H₂SO₄.
Al(s) + H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
We will begin balancing S atoms by multiplying H₂SO₄ by 3.
Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
Then, we balance Al atoms by multiplying Al by 2.
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + H₂(g)
Finally, we get the balanced equation by multiplying H₂ by 3.
2 Al(s) + 3 H₂SO₄(aq) ⇒ Al₂(SO₄)₃(aq) + 3 H₂(g)
the main part of the microscope that is used to see and denlarge specimens what do you call this part?
Answer:
I believe you are asking about the objective lens or eyepiece.
Explanation:
Objective lenses are used to magnify objects enough for you to see them in great detail
Eyepiece/Ocular is what you look through at the top of the microscope.
A tube connects the eyepiece lens to objective lenses, which enhance the magnification power of the eyepiece lens. Both the eyepiece and the objective lens contribute to the magnification of the object.
The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x.
A __________ cycle describes the movement of any chemical element or chemical compound that cycles through the biosphere and plays a role in its stability, as well as cycling through other Earth reservoirs.
The description of the movement of any chemical element that cycles through the biosphere and plays a role in it's stability,as well as cycling through other earth reservoirs is a Biogeochemical cycle.
The wastewater produced by offices is called __
Answer:
sullage or grey water
Explanation:
sources include: sinks, showers, baths, washing machines, dishwashers and no not toliets.
Which of the following has the lowest electronegativity
A. Chromium
B. Arsenic
C. Bromine
D. Potassium
There are only seven base units of the metric system.
Which of the below is NOT a base unit of the metric system.
A. K for temperature
B. kg for mass
C. V for volume
D. s for time
Explanation:
V is not an SI base unit. (C)
Volume can be expressed as m³ in units.
In turn, m is the SI base units for length.
A 10 wheeler truck collides with a car. Who is more likely to be hurt: the driver of the car or the driver of the truck? please justify your answer.
THANK YOU ت︎
Answer:
The driver in the car because a truck is a bigger vehicle and the impact of a truck to a car is more damaging than a car to a truck. Weight difference is the key I think.
Explanation:
Toxic chemicals in drinking water usually are reported and a safety level specified in units of parts per million (ppm) by mass. What is the molar concentration of arsenic in a water sample that has 1 ppm arsenic (As)
Answer:
The molar concentration of water sample that has 1 ppm arsenic is 1.33 * 10⁻⁵ M
Explanation:
1 parts per million (ppm) means 1 part of solute in a million parts of solution.
Since 1 million, 10⁶ mg = 1 kg, 1 ppm = 1 mg/kg
The density of water = 1.0 kg/L, therefore, the volume of 1 kg of water = 1 L
Hence, 1 ppm = 1 mg/kg = 1 mg/L
molar mass of arsenic = 75 g/mol
1 mg of arsenic = 10⁻³ g or 0.001 g
number of moles of arsenic in 0.001 g of arsenic = 0.001 g / 75 g/mol = 1.33 * 10⁻⁵ moles
Molar concentration = 1.33 * 10⁻⁵ mol / 1 L = 1.33 * 10⁻⁵ M
Therefore, the molar concentration of water sample that has 1 ppm arsenic is 1.33 * 10⁻⁵ M
PLEASE HELP! this is the last section and I cant figure it out. any assistance would be greatly appreciated
Reaction of galvanic cell
Further explanationGiven
Redox reaction between Zn and Mg
Required
Half reaction
Potential of the cell
Solution
Zn²⁺ + 2e -> Zn E ° = -0.76 V
Mg²⁺ + 2e -> Mg E ° = - 2.37 V
The higher E ° of the cell will act as the positive pole/cathode
Electrode Zn as a cathode (reduction) and Mg as an anode (oxidation) (E ° of Zn cells is greater than Mg)
Half reaction
Cathode: Zn²⁺ + 2e ⇒ Zn E ° = -0.76 V
Anode: Mg ⇒ Mg²⁺ + 2e E ° = +2.37 V
------------------------------------------------- ----------- +
Cell reaction: Zn²⁺ + Mg ---> Zn + Mg²⁺ E ° cell = +1.61 V
The reaction occurs spontaneously in the absence of an electric current, thus including galvanic cells/voltaic cells
What is the volume of 1.8 moles of O2?
Answer:
33.6 i think
Explanation:
A rigid vessel contains 2.5 mol of H2(g). How many grams of hydrogen are in the vessel.
Answer:
5 g of H₂ are contained in the vessel
Explanation:
A typical excersise of conversion:
We determine molar mass of H₂.
This is a dyatomic molecule, as molar mass of H is 1g/mol, molar mass of H₂ will be 2g/mol.
Let's make the conversion of units:
2.5 mol . 2g/mol = 5 g
5 g of H₂ are contained in the vessel
Mass of hydrogen in the vessel = 5 grams
Number of moles:The number of moles is defined as the given mass over molar mass.
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given:
Number of moles= 2.5 mol
To find:
Mass of hydrogen=?
Molar mass of hydrogen =2g/mol
On substituting the values in the given formula we will get:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=2.5 mol* 2g/mol\\\\\text{Given mass}=5 g[/tex]
Thus, mass of hydrogen in the vessel is 5 grams.
Learn more:
brainly.com/question/14464650
Charles law represents
an inverse relationship
A. a direct relationship
B. a combined relationship
Which shows the correct order of events during the process of nucleosynthesis?
o hydrogen nucleus formed, isotope of hydrogen, trítium formed, helium nucleus formed
helium nucleus formed, hydrogen nucleus formed, isotope of hydrogen, tritium formed
hydrogen nucleus formed, helium nucleus formed, isotope of hydrogen, tritium formed
helium nucleus formed, isotope of hydrogen, tritium formed, hydrogen nucleus formed
Answer:
hydrogen nucleus formed, isotope of hydrogen, trítium formed, helium nucleus formed
Explanation:
Nucleosynthesis is the process which took place within few minutes of formation of universe . In this process initial lighter elements were formed from hydrogen atoms . The correct chronology is as follows .
1 ) Hydrogen nucleus
2 ) Deuterium
3 ) Tritium
4) Helium nucleus .
The correct order of events during the process of nucleosynthesis is hydrogen nucleus formed, isotope of hydrogen, tritium formed, helium nucleus formed.
What is nucleosynthesis?Nucleosynthesis is a process that occurred within a few minutes of the universe's birth. Hydrogen atoms were used to create the first lighter elements in this process.
The following is the correct sequence of events.
Hydrogen nucleusDeuteriumTritiumHelium nucleusThus, the correct option is A.
Learn more about nucleosynthesis
https://brainly.com/question/14123267
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100 POINTS!!! ANSWER ASAP
Answer:
1eV
Explanation:
Answer:
1ev
Explanation:
If a reaction occurs, what will be the products of the unbalanced reaction below?
Literally people are getting me the wrong answers on purpose. jesus. will be marking brainliest.
Explanation:
I think the correct answer is B
Hope this helped u
Which type of reaction is always spontaneous?
A. an exothermic reaction that has an increase in disorder
B. an exothermic reaction that has a decrease in disorder
C. an endothermic reaction that has an increase in disorder
D. an endothermic reaction that has a decrease in disorder
Answer:
A.) an exothermic reaction that has an increase in disorder.
Explanation:
got it correct (unit review test)
HELP!!!
How many grams of tomatoes are equivalent to 1.30 pounds of tomatoes? (1 lb = 453.6 g)
If you can please show me how you solved it. Please and Thank you
Answer: with dog figs- it is 590
With decimals it is 589.68
Explanation:
1. what is the pressure in space equal to?
2. what is the pressure in kPa at sea level?
3. a 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.
4. how many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22°C to 55°C, if the specific heat of aluminum is 0.90 J/g°C?
Answer:
1. The pressure in outer space is so low that many consider it as non-existant. It has a pressure of 1.322 × 10−11 Pa. Pressure may be detected from the molecule of air or water hitting you. Since there is very little air and hardly ever water hitting you in space, pressure is almost zero or negligible.
2. Standard sea-level pressure, by definition, equals 760 mm (29.92 inches) of mercury, 14.70 pounds per square inch, 1,013.25 × 103 dynes per square centimetre, 1,013.25 millibars, one standard atmosphere, or 101.325 kilopascals.
3. 0.46J/gC
explanation.The specific heat capacity of a material is given by:
C_s = \frac{Q}{m \Delta T}C s = mΔTQ
where
Q is the amount of heat absorbedm is the mass
\Delta TΔT is the variation of temperature
For the piece of iron in the problem:
m = 15.75 gm=15.75g
Q=1086.75 JQ=1086.75J
\Delta T=175 C-25 C=150^{\circ}ΔT=175C−25C=150∘
Substituting into the equation,
C_s = \frac{1086.75 J}{(15.75 g)(150^{\circ}C)}=0.46 J/gCC s = (15.75g)(150 ∘ C)1086.75J = 0.46J/gC
4. 207 J
Explanation:
The key to this problem lies with aluminium's specific heat, which as you know tells you how much heat is needed in order to increase the temperature of 1 g of a given substance by 1∘C.
#I hope it's help
animal and Plant Cells Worksheet Word
Answer:
u didnt give a worksheet
Explanation:
What are two ways to describe concentration? How do they differ from one another?
Answer:
no .........................
Differentiate photosynthesis and cellular respiration
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
Explanation:
Answer:
photosynthesis is how green plants turn carbon dioxide, water, and sunlight. into glucose, and oxygen. its the other way with cellular respiration
what is the percent chance that the offspring will be dwarf plants with yellow fruit
Answer:
Yellow fruit and dwarf vines are recessive traits in tomatoes. Red fruit and tall vines are dominant. Complete a Punnett square and answer the questions for a completely dominant red and tall plant crossed with a heterozygous red and dwarf plant.
Explanation: