How many moles of helium are needed to fill a balloon to a volume of 5.3 L at 22 ℃ and 632 mmHg?
Answer:
0.18 moles
Explanation:
Applying,
PV = nRT................... Equation 1
Where P = pressure, V = volume, n = number of moles, R = molar gas constant, T = temperature.
make n the subject of the equation
n = PV/RT............... Equation 2
Given: V = 5.3 L, T = 22 °C = (22+272) K = 295 K, P = 632 mmHg = (0.00131579×632) = 0.8316 atm, R = 0.083 L.atm/K.mol
Substitute these values into equation 2
n = (0.8316×5.3)/(0.083×295)
n = 0.18 moles
can somebody help me with this question please
Answer:
concave lens
Explanation:
it's concave lens because it diverges the ray/beam of light.
Concave lens
The concave lens always repels the ray of light to go away .There are 2 types of lens
ConvexConcaveHow can you use the periodic table to determine the charge of an ion?
Answer:
memorise them
Explanation:
1, 2, skip metals, 3, 0, -3, -2, -1
Which element, when combined with Fluorine, would form an COVALENT compound?
A.Lithium
B.Iron
C.Phosphorus
D.Sodium
Answer:
Explanation:
A covalent compound is a compound formed by covalent bonds. A covalent bond is formed between two atoms where electrons are shared between the two atoms. This forms a molecule.
What determines whether two elements will form a covalent compound or not is the number of valence electrons present in each of the elements.
Fluorine will form a covalent compound with phosphorous because fluorine has 5 electrons in its outermost shell. It needs 3 more to become stable.
Phosphorous also has 5 valence electrons. It needs 3 more to become stable.
What happens is that 3 atoms of FLuorine combine with one atom of Phosphorus, sharing the valence electrons between themselves. This leads to the formation of the PF3 molecule.
Both the Phosphorous and the Fluorine are now stable.
Answer: Phosphorus
Explanation: since both are non-metals they would both create a covalent bond.
Meera added blue copper sulphate crystals to some water in a beaker.
The copper sulphate dissolved in the water.
1 give one way meera could see that the copper sulphate had dissolved in the
Answer:
The solid crystals disappeared
Explanation:
When a soluble solid solute is added to water, the solid solute disappears after a little while. The disappearance of this solute indicates that the solute has been dissolved in water.
In this case, blue copper sulphate crystals are added to water, the blue crystals disappear leaving only a blue solution. The disappearance of these blue copper sulphate crystals indicates that the substance has dissolved in water.
Which planet rotates the slowest on its axis?
Answer:
Venus
What is the Slowest Planet. Venus, which is floating higher each evening in twilight, low in the west, is the slowest-spinning body in the known universe. If you walked along a bike path that circles its equator, you'd only need to go four miles an hour to keep night from ever falling on Venus.
Answer:
Venus
Explanation:
It rotates once every 243 days, by far the slowest rotation period of any of the major planets.
hope its correct :)
A bottle of Hydrogen Peroxide is labeled 9.5% by volume. How many milliliters of H2O2 are in 480.00ml bottle of this solution
Answer:
45.6 millilitres of hydrogen peroxide are in 480.00 mL of 9.5% by volume hydrogen peroxide solution
Explanation:
A percentage solution of Hydrogen peroxide is a volume per volume percentage solution. This means that each given percentage solution is expressed as a given mL of the substance found in 100 mL of solution.
A 9.5 percentage hydrogen peroxide solution contains 9.5 mL of hydrogen peroxide in 100 mL of solution.
Millitres of hydrogen peroxide found in 480.00 mL of solution = 9.5/100 × 480 mL = 45.6 mL
Therefore, 45.6 millilitres of hydrogen peroxide are in 480.00 mL of 9.5% by volume hydrogen peroxide solution
2. Which type of energy is centered around breaking the bonds between elements in a compound?
Nuclear
Chemical
Electrical
Elastic
11.
The picture shows sand used to make a model of a galaxy. In the model, each grain of
sand best represents
A.
B.
a comet
a black hole
an asteroid
C.
D.
a star
Answer:
D
Explanation:
I took that.
Ionic bond is formed between atoms of ____and ______
A. metals, non-metals
B. metals, metals
C. non-metals, non-metals
Answer:
A. metals and non-metals
Answer:
Metals-Non-Metals
Explanation:
You see, that is the answer because when the asnwer.
[tex]\geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq \geq[/tex]
Ammonia gas (NH3) combines with oxygen gas (O2) to form diatomic nitrogen gas and water vapor. If 4.0 grams of ammonia react, how many liters of nitrogen gas are produced? The gas is collected at 32.00°C and a pressure of 2.6 atmospheres.
Answer:
1.13 L
Explanation:
First, we have to write the chemical equation for the reaction between ammonia gas (NH₃) and oxygen gas (O₂) to give nitrogen gas (N₂) and water (H₂O), as follows:
NH₃(g) + O₂(g) → N₂(g) + H₂O(g)
Then, we have to balance the equation (we write first the coefficient 2 for NH₃ to balance N atoms, then a coefficient of 3 for H₂O to balance H atoms, and finally 1/3 to balance the O atoms):
2 NH₃(g) + 3/2 O₂(g) → N₂(g) + 3 H₂O(g)
In the balanced equation, we can see that 1 mol of N₂ is produced from 2 moles of NH₃. We convert the moles of NH₃ to grams by using its molecular weight (MW):
MW(NH₃) = 14 g/mol N x 1 + (1 g/mol H x 3) = 17 g/mol
grams of NH₃ = 17 g/mol x 2 = 34 g
Thus, we have the stoichiometric ratio:
1 mol of N₂/2 mol NH₃ = 1 mol of N₂/34 g NH₃
To calculate how many moles of N₂ are produced from 4.0 of NH₃, we multiply the mass by the conversion factor:
4.0 g NH₃ x 1 mol of N₂/34 g NH₃ = 0.1176 moles N₂
Finally, we calculate the liters of N₂ gas by using the ideal gas equation:
PV = nRT ⇒ V = nRT/P
We introduce the data in the equation:
T = 32.00°C + 273 = 305 K
P = 2.6 atm
R = 0.082 L.atm/K.mol (is the gas constant)
n= 0.1176 moles
⇒ V = nRT/P = (0.1176 mol x 0.082 L.atm/K.mol x 305 K)/(2.6 atm)
= 1.13 L
How is our sense of vision like our sense of smell?
Answer:
Since previous studies had shown that the brain's visual center lights up with activity when someone does a purely smell-related task, a group of researchers set out to test what these two senses have to do with each other. ... The electric current startles that area of the brain into extra activity.
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
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.
What would make oppositely charged objects attract each other more?
increasing the positive charge of the positively charged object and increasing the negative charge of the
negatively charged object
decreasing the positive charge of the positively charged object and decreasing the negative charge of the
negatively charged object
increasing the distance between the positively charged object and the negatively charged object
maintaining the distance between the positively charged object and the negatively charged object
Answer:
a: increasing the positive charge of the positively charged object and increasing the negative charge of the negatively charged object
Explanation:
The oppositely charged objects attract each other more is option a. It increased the positive charge and the negative charge.
The Attraction of the oppositely charged:At the time when the oppositely charged objects are attracted to each other more so here the positive charge should be increased with respect to the positive charge object and the negative charge is increased with respect to the negative charge object
Hence, the first option is correct.
Learn more about an object here: brainly.com/question/19587294
10. What is the mass of 2.6 moles of Ag?
O 2.4 x 10-2 g
O 2.9 g
O 280 g
O 1.6 x 1024 g
Answer: 280 g
Explanation:
Which elements are in the compound hydrochloric acid?
A. Helium and carbon
B. Hydrogen and carbon
C. Helium and chlorine
D. Hydrogen and chlorine
Answer:
D. Hydrogen and chlorine
Explanation:
Answer:
d
Explanation:
hydrogen and chlorine
is the compound of hydrochloric acid
Place the following items in the correct order to show how a voice can be recorded and saved using an analog device.
Answer:
A person sings into a microphone.
Sound is converted to an electrical signal
The electric signal creates a magnetic code.
A magnetic code is transferred to a medium such as a tape or ...
what is the name of the shape that is a quadrilateral where all 4 sides are the same length
HELP QUICK
Answer:
Square
Explanation:
A square is a quadrilateral with r sides the same length
I will give brainliest to the correct answer. Please answer soon!! Thank you!
If I contain 0.190 moles of gas in a container with a volume of 6.0 liters and at a temperature of 354.0 K, what is the pressure inside the container?
Answer:
0.92 atm
Explanation:
Assuming this is the ideal gas law, PV = nRT. Plug in the values for each.
P = unknown
V = 6.0 L
n = 0.190 moles
R = 0.0821 (there are other rates of constant, such as 8.31, 62.4, but match it up to the correct units! 8.31 will answer in units of kPa and 62.4 will answer in units of mmHg, and lastly 0.0821 answers in atm.)
T = 354.0 K
Set up your equation.
P(6) = 0.190(0.0821)(354)
6p = 5.522046
Divide.
p = 0.920341...
Answer: 0.92 atm
Hope this is right!
4. A typical human consumes 2500 Kcal of energy during a day. This is the equivalent to 10,450,000 J. Say you decided to run stairs all day. Given that there are: 24 hours / day • 60 minutes / hour • 60 seconds / minute = 86,400 seconds / day How much energy, in Joules, would you burn in climbing stairs all day?
Answer:
The amount of energy that would be burnt in climbing stairs all day is approximately 52,738,560 Joules
Explanation:
The question is with regards to an experiment with details that can be obtained from the U Oregon website
The given parameters of the question are;
The energy consumed by a human each day = 2,500 kcal = 10,450,000 J
The required parameters obtained from U Oregon website are;
The average weight of a student, W ≈ 60 kg × 9.81 m/s² = 588.6 N
The average time it takes a student to run up a flight of stairs = 5.4 s
The height of the stairs, h = 0.2 m × 28 = 5.6 meters
Therefore, we get;
Work done in climbing up the stares = W × h = 588.6 N × 5.6 meters = 3,296.16 J
The height the student can climb in a day is given as follows;
The time of 1 day in seconds, t = 86,400 s
The height the student climbs in 5.4 s = 5.6 m
∴ Vertical velocity, [tex]v_y[/tex] = 5.6 m/(5.4 s) = (28/27) m/s
The vertical height the student climbs in a day, [tex]h_{(v \, all \, day)}[/tex] = [tex]v_y[/tex] × t
∴ [tex]h_{(v \, all \, day)}[/tex] = (28/27) m/s × 86,400 = 89,600 m
The work done all day = W × [tex]h_{(v \, all \, day)}[/tex] = 588.6 N × 89,600 m = 52,738,560 J
The amount of energy in joules that would be burnt in climbing stairs all day = The work done all day = 52,738,560 Joules
How are chemical and mechanical weathering the same?
Answer:
They break down materials into smaller pieces
Explanation:
Although using different methods
Which substance is an ionic solid? A. LiCl B. HCl C. Ne D. Fe
Answer:
A. LiCl
Explanation:
Lithium chloride is an ionic compound but it also has some covalent character due to the very small size of lithium metal.
Ionic solids are formed between a metal and a nonmetal. Among the given options, option A, LiCl is an example of ionic solid formed from lithium metal and chlorine.
What is ionic solid?Ionic compounds are formed between metals and non-metals. Metals are electron rich and easily loss electrons. Non metals are mostly electron deficient and gain electron from metals.
Lithium is an alkali metal with one valance electron. Cl is 17th element with 7 valence electrons. Cl needs one more electron to achieve octet. Li donates its valence electron to Cl, and gains a positive charge and Cl gains a negative charge by accepting the electron.
The opposite charges between the atoms gets attracted electrostatically forming ionic bond between them and the compound LiCl results. HCl is a covalent compound. Ne and Fe are pure metals and not ionic solids. Hence, option A ic correct.
Find more on ionic solids:
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el cuerpo humano puede resistir contaminantes más toxicos como el mercurio?
porque y como?
Answer:
no por qué el cuerpo es muy débil
Explanation:
cómo los murciélagos muchos son muy agresivos y eyos resisten
How many protons are in an atom of phosphorus
Answer:
15
Explanation:
Answer:
there are 15 protons in an atom of Phosphorus.
ASAP - Thank you
Atoms with greatly different electronegativity values are expected to form ______.
a. ionic bonds
b. triple bonds
c. covalent bonds
d. no bonds
e. none of these choices
Answer:
Covalent bonds
Explanation:
Atoms with greatly differing electronegativity values are expected to form..... ... When two atoms each need additional electrons to fill their valence shells, but neither is electronegative enough to steal electrons from the other, they can form another kind of chemical bond called a covalent bond.
convert 33.6 degree Celsius to degree Fahrenheit
Answer:
Your answer is 92.48 degrees Fahrenheit, or just 92 degrees.
Explanation:
The formula for finding degrees Celsius and turning them into Fahrenheit is: (C x 9/5) + 32. So,
33.6 x 9/5 = 60.48
60.48+ 32= 92.48.
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Newton's third law of motion States that for every action there is an equal and opposite reaction. Which of these illustrates newtons third law?
Answer:
This question lacks options, the options are:
A: Two students of similar mass run into each other. They bounce off each other when they collide.
B: Two students of similar mass run side by side into a wall and punch holes of equal size before emerging on the other side.
C: Two students of similar mass run in opposite directions, but one accelerates at twice the rate of the other.
D: Two students of similar mass run at the same speed in opposite directions on a track. They will collide with 400 Newtons of force in 400 meters.
The answer is A.
Explanation:
Isaac Newton proposed three laws, which he called laws of motion. The third of these laws states that for every action, there is an equal and opposite reaction. This means that if an object A collides with object B, object B will exert a force of similar magnitude but in opposite direction on object A.
From the examples in the option, when two students of similar mass run into each other. They bounce off each other when they collide. This means that student 1 and student 2 will go in opposite directions after collision with one another. This portrays Newton's third law of motion.
Potential energy
Reaction progress
A. The products have higher potential energy, and energy is
absorbed.
O B. The reactants have higher potential energy, and energy is
absorbed.
C. The products have higher potential energy, and energy is released.
D. The reactants have higher potential energy, and energy is released.
Answer:
I believe it's D.
Explanation:
True or False. Weather patterns in the US moves from the West to East across the
country.
Answer:
North America) than in the tropics. Since low pressure systems spin in a counterclockwise fashion, winds move from the west to the east, propelling weather systems to the east. Another MAJOR factor that drives weather systems in the U.S. is that the Jet Steam moves from West to East across North America.
Explanation:
I hope this helped
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