Answer:
After three hours, concentration of C₂F₄ is 0.00208M
Explanation:
The rate constant of the reaction:
2 C2F4 → C4F8 is 0.0410M⁻¹s⁻¹
As the units are M⁻¹s⁻¹, this reaction is of second order. The integrated law of a second-order reaction is:
[tex]\frac{1}{[A]} =\frac{1}{[A]_0} +Kt[/tex]
Where [A] and [A]₀ represents initial and final concentrations of the reactant (C₂F₄), K is rate constant (0.0410M⁻¹s⁻¹) and t is time of the reaction (In seconds).
3.00 hours are in seconds:
3 hours ₓ (3600 seconds / 1 hour) = 10800 seconds
Initial concentration of C2F4 is:
0.105mol / 4.00L = 0.02625M
Replacing in the integrated law:
[tex]\frac{1}{[A]_0}= \frac{1}{0.02625} +0.0410M^{-1}s^{-1}*10800s\\\frac{1}{[A]_0}=480.9M^{-1}[/tex]
[A] = 0.00208M
After three hours, concentration of C₂F₄ is 0.00208MWhat two units are typically shown on thermometers?
Answer:
Fahrenheit and Celsius
Explanation:
Elements that can exist in two or more geometric patterns are called
Answer:
The answer is allotropes
Explanation:
As known by studying and research the ansqer came out to be allotropes
Complete the statement about the environment and its components.
An environment is when its components, such as forests, parks, houses, and schools, contribute favorably to the people living in that environment.
Reset
the environment is Healthy
how does chemistry affect our world?
Answer:
Research is constantly deepening our understanding of chemistry, and leading to new discoveries. Chemistry will help us solve many future problems, including sustainable energy and food production, managing our environment, providing safe drinking water and promoting human and environmental health.Chemistry is a big part of your everyday life. You find chemistry in daily life in foods you eat, air you breathe, soap, your emotions and literally every object you can see or touch. ... Food is made from chemicals. Many of the changes you observe in the world around you are caused by chemical reactions.By observing chemical reactions, we are able to understand and explain how the natural world works. Chemical reactions turn food into fuel for your body, make fireworks explode, cause food to change when it is cooked, make soap remove grime, and much more.
1. Which of the following best describes the relationship
between cells and living things in general? *
O A The larger the living thing, the larger are its cells.
O B All living things are made up of one or more cells.
O c The number of cells in all living things is the same.
O D There is one kind of cell of which all living things are made.
If the density of mercury is 13.6g/ml, what is the mass in grams of 3426 ml of the liquid?
A copper cylinder, 12.0 cm in radius, is 44.9 cm long. If the density of copper is 8.90 g/cm^3, calculate the mass in grans of the cylinder. (Assume pi=3.14
Answer:
1. 46593.6g
2. 177065.856g
Explanation:
1. 13.6*3426=46593.6g
2. [tex]\pi r^{2}[/tex] = [tex]12^{2}[/tex] * 3.14=452.16 [tex]cm^{2}[/tex] (area of circle)
452.16*44.0=19895.04 [tex]cm^{3}[/tex] (volume of cylinder)
8.90*19895.04=177065.856g
≈177065.9g
Hope this helps.
Dawa ate junk food at breakfast and worried about the examination, which combined to give her an annoying case of acid indigestion. Suggest some ways to reduce the indigestion
The molar mass of silver (Ag) is 107.87 g/mol.
Calculate the mass in grams of a sample of Ag containing 1.97 x 1022 atoms.
Write your answer using three significant figures.
g Ag
Answer:
3.53 g
Explanation:
To convert from atoms to moles, you need to know Avogadro's number. Avogadro's number (6.022 × 10²³) is how many atoms there are in one mole of a substance. Use this to convert.
(1.97 × 10²² atoms) ÷ (6.022 × 10²³ atoms/mol) = 0.0327 mol
Now that you have moles, use the molar mass to convert to grams.
(0.0327 mol) × (107.87 g/mol) = 3.53 g
The mass in grams of the sample of Ag to three significant figures is 3.53 grams
The formula for calculating the number of moles of a substance is expressed as shown below:
[tex]moles =\frac{Mass}{Molar mass}[/tex]
Given the following parameters
Molar mass = 107.87 g/mol.
number of atoms of the sample = 1.97 x 1022 atoms.
Get the number of moles of the substance:
Moles = 1.97 × 10²²/6.022 × 10²³ = 0.0327 mol
Get the required mass of the substance:
Mass = moles * molar mass
Mass = 0.0327 * 107.87
Mass = 3.53 grams
Hence the mass in grams of the sample of Ag to three significant figures is 3.53 grams
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Someone please quickly help
54,000,000 nanometers equals 0.000000054 megameters. true or flase
Answer:
true...
Explanation:
where are chemicals found at work? answer 1- in every work area answer 2-only in food preperation answer 3-only in carpets or paint answer 4- only in cleaing products
Answer:
In every work area
Convert -32 F into K
Answer:
-32 Fahrenheit converts to 237.594 Kelvin
1.what causes a fire tornado to form ?
2. how are firefighters expected to deal with them ?
3. why are fire tornadoes rare ?
Please help!!!
Perform the following operation
and express the answer in
scientific notation.
9x102: 3x1012
Answer:
3 × 10¯¹⁰
Explanation:
9×10² ÷ 3×10¹²
The above expression can be simplified as follow:
9×10² ÷ 3×10¹²
Recall:
9 = 3²
9×10² ÷ 3×10¹² = 3²×10² ÷ 3×10¹²
Recall:
a^m ÷ a^n = a^(m – n)
3²×10² ÷ 3×10¹² = 3^(2 – 1) × 10^(2 – 12)
= 3¹ × 10¯¹⁰
Recall:
a¹ = a
3¹ × 10¯¹⁰ = 3 × 10¯¹⁰
what do you understand by Project of National Pride
Answer:
National Pride Projects are a set of infrastructure projects by the government of Nepal based on the proposal by the National Planning Commission.
HELP! WILL MARK BRAINLIEST!! please in your own words!! due today!! doesn't need to be long!!
Answer:
A Drug That Slowly Cures Cancer
Explanation:
They create a lot of drugs so maybe a drug that would slowly kill off the cancer in the person's body. It would save many lives.
Answer:Chemists analyze substances. They determine what is in a substance, how much of something is in a substance, or both. ...
Chemists create, or synthesize, new substances. ...
Chemists create models and test the predictive power of theories. ...
Chemists measure the physical properties of substances.
i WOULD LIKE Nanopesticides
Nano-formulated pesticides can deliver active ingredients where they are needed without polluting the environment or – like neonicotinoids have been accused to do – indiscriminately kill essential wildlife. And more efficient agrochemicals are urgently needed to support a global population that will reach 10 billion by 2050.
So far, only a few studies have shown that nanoagrochemicals are actually more efficient than their traditional counterparts, and none of them have been tested in the field yet.
A cylinder container is filled with air. Its radius is 6.00 cm and
its height is 3.50 cm. What is the volume of air inside? (Use 3.14
for it)
Answer:
395.84cm³
Explanation:
V= π r² h
V= 3.14 6² 3.5
V= 3.14 36 3.5
V= 395.84
The volume of the air inside the cylinder is 395.64 cubic centimeters.
Given:
A cylinder container is filled with air. Its radius is 6.00 cm and its height is 3.50 cm.
To find:
The volume of the air inside the cylinder.
Solution:
The radius of cylinder = r = 6.00 cm
The height of the cylinder = h = 3.50 cm
The volume of the cylinder = V
The volume of the cylinder is given :
[tex]V=\pi r^2 h\\\\V=3.14\times (6.00 cm)^2\times 3.50 cm\\\\V=395.64 cm^3[/tex]
The volume of the air in cylinder = V = [tex]395.64 cm^3[/tex]
The volume of the air inside the cylinder is 395.64 cubic centimeters.
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Boojho wants to separate the following materials as combustible and non-combustible. Can you help him?
Charcoal, chalk, stone, iron rod, copper coin, straw, cardboard, glass, paper, candle, wood
Combustible: Charcoal, straw, cardboard, paper, candle, wood.
Non-combustible: Chalk, stone, iron rod, copper coin, glass.
how many miles will a person run in a 10 kilometers race
Answer:
6.2 Miles!
Explanation:
Definition of science
Answer: science is the systematic way of gaining knowledge about nature
which if the following questions can be answered by science?
Answer:
Need the choices before i can give answers thanks
Explanation:
If you have a density of 15 g/mL and a mass of 5 g, what is the volume? (Don’t use fractions–change it to a decimal form)
Answer:
0.33 mL
Explanation:
Use the density formula, D = [tex]\frac{m}{v}[/tex], where m is the mass and v is the volume.
Plug in what we know and solve for v:
15 = [tex]\frac{5}{v}[/tex]
15v = 5
v = 0.33
= 0.33 mL
Answer:
d≈0.33 mL
Explanation:
Volume can be found by dividing the mass by the density.
v= m/d
The mass is 5 grams and the density is 15 grams per milliliter. Therefore,
m= 5 g
d= 15 g/mL
Substitute the values into the formula.
v= 5g / 15 g/mL
Divide 5 g by 15 g/mL. When you divide, the grams (g) in the numerator and denominator will cancel each other out.
d= 0.333333333 mL
Let's approximate our answer and round to the nearest hundredth. The 3 in the thousandth place tells us to leave the 3 in the hundredth place.
d≈ 0.33 mL
The density is approximately 0.33 milliliters.
A rock occupies a volume of 20 cm and has a mass of 54 g. Find the density of
this rock.
Answer:
Hey there!
Density=Mass/Volume
Density=54/20
Density=2.7 g/cm^3
Let me know if this helps :)
3. A 134.50 g sample of aspirin is made up of 6.03 g of hydrogen, 80.70 g of carbon, and 47.77 g of oxygen. What is the percent by mass of each element in aspirin?
Answer:
The percentage of mass of hydrogen in aspirin is 4.48%
The percentage of mass of carbon in aspirin is 60%
The percentage of mass of oxygen in aspirin is 35.5%
Explanation:
Given that,
Mass of sample of aspirin = 134.50 g
Mass of hydrogen = 6.03 g
Mass of carbon = 80.70 g
Mass of oxygen = 47.77 g
We need to calculate the percentage of mass of hydrogen in aspirin
Using formula for percentage of mass
[tex]\text{percentage of mass of hydrogen}=\dfrac{m_{h}}{m_{s}}\times100[/tex]
Put the value into the formula
[tex]\text{percentage of mass of hydrogen}=\dfrac{6.03}{134.50}\times100[/tex]
[tex]\text{percentage of mass of hydrogen}=4.48\%[/tex]
We need to calculate the percentage of mass of carbon in aspirin
Using formula for percentage of mass
[tex]\text{percentage of mass of carbon}=\dfrac{m_{c}}{m_{s}}\times100[/tex]
Put the value into the formula
[tex]\text{percentage of mass of carbon}=\dfrac{80.70}{134.50}\times100[/tex]
[tex]\text{percentage of mass of carbon}=60\%[/tex]
We need to calculate the percentage of mass of oxygen in aspirin
Using formula for percentage of mass
[tex]\text{percentage of mass of oxygen}=\dfrac{m_{o}}{m_{s}}\times100[/tex]
Put the value into the formula
[tex]\text{percentage of mass of oxygen}=\dfrac{47.77}{134.50}\times100[/tex]
[tex]\text{percentage of mass of oxygen}=35.5\%[/tex]
Hence, The percentage of mass of hydrogen in aspirin is 4.48%
The percentage of mass of carbon in aspirin is 60%
The percentage of mass of oxygen in aspirin is 35.5%
An organic compound composed of carbon and hydrogen connected only by double bonds is an ________. Group of answer choices
Answer:
Alkene
Explanation:
An organic compound with carbon and hydrogen and at least one double bond is an alkene. You can also have alkanes and alkynes.
Alkanes have single bonds. Alkynes have at least one triple bond.
Answer:
an alkene is an hydrocarbon that contains a carbon–carbon double
bond.
The term is often used as synonym of olefin, that is, any hydrocarbon containing
one or more double bonds.
An engineering team designs a new rocket that is faster and lighter than any other model being produced. However, the materials end up being so expensive that no company can afford to buy them. Which step of the engineering process should have addressed this problem?
Answer:
Evaluate the answer or Know the background may be the answer. Same question was asked by a person name razielhernandez10 and he got these answers.
Evaluate the answer that should address this problem.
The answer is option A.
What is the correct order of the engineering process?Engineering layout Loop: the stairs of the design technique encompass: identifying the need, studying the trouble, increasing possible solutions, picking out the maximum promising solution, assembling a prototype, checking and examining the prototype, speaking the layout, and redecorating.
The engineering layout method starts off evolved via defining a problem and completing heritage studies at the hassle. Requirements are targeted and a solution is selected. A prototype of the solution is constructed after which examined. If the answer built meets the necessities then the outcomes may be shared.
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What volume, in mL, of carbon dioxide gas is produced at STP by the decomposition of 0.242 g calcium carbonate (the products are solid calcium oxide and carbon dioxide gas). Report your answer to 4 sig figs
Answer:
54.21 mL.
Explanation:
We'll begin by calculating the number of mole in 0.242 g calcium carbonate, CaCO3.
This is illustrated below:
Mass of CaCO3 = 0.242 g
Molar mass of CaCO3 = 40 + 12 +(16x3) = 40+ 12 + 48 = 100 g/mol
Mole of CaCO3 =?
Mole = mass /Molar mass
Mole of CaCO3 = 0.242/100
Mole of CaCO3 = 2.42×10¯³ mole.
Next, we shall write the balanced equation for the reaction. This is given below:
CaCO3 —> CaO + CO2
From the balanced equation above,
1 mole of CaCO3 decomposed to produce 1 mole CaO and 1 mole of CO2.
Next, we shall determine the number of mole of CO2 produced from the reaction.
This can be obtained as follow:
From the balanced equation above,
1 mole of CaCO3 decomposed to produce 1 mole of CO2.
Therefore,
2.42×10¯³ mole of CaCO3 will also decompose to produce 2.42×10¯³ mole of CO2.
Therefore, 2.42×10¯³ mole of CO2 were obtained from the reaction.
Finally, we shall determine volume occupied by 2.42×10¯³ mole of CO2.
This can be obtained as follow:
1 mole of CO2 occupies 22400 mL at STP.
Therefore, 2.42×10¯³ mole of CO2 will occupy = 2.42×10¯³ x 22400 = 54.21 mL
Therefore, 54.21 mL of CO2 were obtained from the reaction.
2. how are firefighters expected to deal with them
please help me I need this answered ASAP. You take a 10-day trip across the country by car. At the beginning of the trip you zero the odometer and every evening you write down the odometer reading At the end of the trip you make a graph of cumulative miles travelled vs the day the measurement was taken
Which of the following do you think is true?
a) The mileage is the independent variable and the day is the dependent variable.
b) The day is the independent variable and the mileage is the dependent
variable.
C) Neither variable is independent or dependent
The image to the right is an odometer, which measures the number of miles traveled based on the rotation of the car's wheels This car traveled 91.308 miles
explain your reasoning
The day is the independent variable and the mileage is the dependent variable. Thus option B is correct.
What are the types of variables in experiment ?
Variables are the measurable parameter can be manipulated and controlled in research. For example person's eye color, its value can be changed from brown to blue depend on different factors.
An independent variable is a single character where Age is an example of an independent variable and dependent variable depend on other variable like it can be changed by other components.
Control variable remain constant and show no effect on other variables. It is used to prevent bias in an experiment. An intervening variable or mediator variable is another variable can modify the relationship between dependent and independent variables.
Thus option B is correct.
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How does the area of the rectangle relate to the lengths of each side?
Answer:
A = l×b
Explanation:
Rectangle is a closed figure with 4 vertices. Each angle of a rectangle is 90 degrees. The opposite sides of a rectangle are equal.
Let l is the length of opposite sides of a rectangle and b is the breadth of the opposite sides of a rectangle.
The area of a rectangle is then given by :
A = l×b
i.e. area of a rectangle is equal to length times breadth.