Answer:
As the ballon rises higher the atmospheric pressure will drop if the ballon is made of an elastic material,it will stretch to allow the gas inside it to expand
Pat wants to measure the length of a table. She'll use a measuring tape. Which units should Pat use to express the length?
A.
pints
B.
degrees
C.
inches
D.
moles
Answer:
the answer is c)inches
Explanation:
inches is best for showing length
Consider the reaction 2CuCl2 + 4KI → 2CuI + 4KCl + I2. If 4 moles of CuCl2 react with 4 moles of KI, what is the limiting reactant?
Answer:
The limiting Reactant would be KI
Explanation:
PLZZZ HELP ME ASAP
Use the de Broglie's Wave Equation to find the wavelength of a 400 g ball moving at 120 m/s. Please show your work. Note: h = Planck's constant (6.62607 × 10-34 J*s)
de Broglie's wave equation describes that particles have wave properties. The equation is
λ = h/mv
Where λ is the wave length of the particle (m), h is the Planck's constant (6.62607 x 10⁻³⁴J s), m is the mass of a particle (kg) and v is the velocity (m/s).
λ = ?
h = 6.62607 x 10⁻³⁴ J s
m =200 g = 0.2 kg
v = 20 m/s
By substitution,
λ = 6.62607 x 10⁻³⁴ J s / (0.2 kg x 20 m/s)
λ = 1.66 x 10⁻³⁴ m
Hence, the wavelength of the 200 g ball 1.66 x 10⁻³⁴ m.
use the the dot strict on the right to and the periodic table to determine the element represented.
sodium (Na)
potassium (K)
neon (Ne)
argon (Ar)
Answer:
Pottasium
Explanation:
because it is the nineteenth element
Answer:
The answer is B. Potassium.
Explanation: Potassium has 19 electrons that are organized like the image if you count the electrons on each obital. This answer is correct on edge 2020. Hope this helps!
Can you guys help me with question 7 and 8
Answer:
Q.no 8 = at the at the bottom of the first hill.
Bryan is doing a chemistry lab and needs to measure exactly 3.5000 mL of water. How many significant digits are in this measurement?
1
2
3
5
What's the velocity of a ball falling with 100 joules of kinetic energy and a mass of 2 kilograms?
А. 3 m/s
B. 5 m/s
C. 7 m/s
D. 8 m/s
E. 10 m/s
Answer:
E
Explanation:
kinetic energy of linear motion
[tex]k.e = \frac{1}{2} m {v}^{2} [/tex]
kinetic energy, K.e= 100joules
mass, m = 2kg
velocity, v =?
substituting the values into the formula :
[tex]100joules = \frac{1}{2} \times 2kg \times {v}^{2} [/tex]
[tex] {v }^{2} = 100[/tex]
[tex]v = \sqrt{100 } [/tex]
[tex]v = 10m { \sec }^{ - 1} [/tex]
How many moles of tungsten are in 415 grams of tungsten?
Answer:2.26
Explanation:
Which type of bond forms between atoms of iron (Fe)?
A. ionic
B. Metallic
C. Polar covalent
D. Nonpolar covalent
Answer:
Metallic
Explanation:
Iron is a metal
What tricks to use to differentiate between Ionic and Covalent bonds
Answer: first of all an ionic bonds is the electrostatic force of attraction between opposite ions and and covalent bonds is the bond between different elements mostly non metals or the sharing of electrons between elements which are mostly non metals.
Explanation: metals and non metals react to form ionic compounds
and non metals react to form covalent bonds
HOW TO DIFFERENTIATE
ionic solids the particles are charged and the forces between them are strong
covalent solids the particles are not charged and the forces between them are weak
now i would differentiate using their properties
ionic bonds / compounds
have high melting point
have low melting point
They are soluble in water
and they conduct electricity even when melted or dissolved in water
covalent bonds /compounds
they have low melting point
they have low melting point
They are insoluble
they do not conduct electricity
HOPE THIS HELPS!!!
Can someone help with this please
Answer:
see explanations
Explanation:
4NH₃(g) + 5O₂(g) => 4NO(g) + 6H₂O(g)
Ci(NH₃) = 3.5mole/4L = 0.875M
Cf(NH₃) = 1.6mole/4L = 0.400M
Rate-1 => Δ[NH₃]/Δt = |(0.400M - 0.875M)/3min| = 0.158M/s
Rate-2 => 6(Δ[NH₃]/Δt) = 4(Δ[H₂O]/Δt) => 6/4(0.158M/s) = 0.237M/s
Rate-3 => 5(Δ[NH₃]/Δt) = 4(Δ[O₂]/Δt) => 5/4(0.158M/s) = 0.237M/s
_________________________________________________________
NOTE: When setting up comparative rate expressions for a given reaction, set the rates expressions as equal then swap coefficient values. Then solve for rate of interest and substitute givens.
example: for NH₃ and H₂O
set rates expressions equal => Δ[NH₃]/Δt = Δ[H₂O]/Δt then swap and insert coefficients from given rxn ...solve for rate of interest ...4NH₃(g) + 5O₂(g) => 4NO(g) + 6H₂O(g)
=> 6(Δ[NH₃]/Δt) = 4(Δ[H₂O]/Δt)
=> Δ[H₂O]/Δt = 6/4(Δ[NH₃]/Δt) = 6/4(0.237M/s) = 0.237M/s
It's said that not all electrons in an atom have the same amount of energy. Is it the same for protons? Because if it's not then how come they have the same atomic number at the end?
Answer:
When an atom has an equal number of electrons and protons, it has an equal number of negative electric charges (the electrons) and positive electric charges (the protons). The total electric charge of the atom is therefore zero and the atom is said to be neutral.
I HOPE THIS HELPS !!!!!!!!!!!
hi can anyone help me with a gas law device
Explanation:
The Gas Law Apparatus is a high-quality demonstrator of the relationship between pressure, volume and temperature of a gas. The pressure gauge shows how pressure affects volume and vice versa. A digital thermometer displays the temperature.
You go fishing and obtain some less weights for your trip. Lead’s density is 11.34 g/mL. If there are 50 weights in a 250 mL box, what is the mass of each weight?
Answer:
Mass of each weight = 56.7 gram per piece
Explanation:
Given:
Lead’s density = 11.34 g/mL
Number of weights = 50
Volume of box = 250 mL
Find:
Mass of each weight
Computation:
Mass = volume x density
Mass = 250 x 11.34
Mass = 2,835 gram
Mass of each weight = Total Mass / Number of weights
Mass of each weight = 2,835 / 50
Mass of each weight = 56.7 gram per piece
PLZ HELP ME WITH MY WORK
ProblemWhat is the concentration of a tin(ll) chloride solution prepared from a sample of tin ore?Experimental DesignThe potassium dichromate solution is first standardized by titration with 15.00 mL of an acidified 0.07 mol/L solution of the primary standard, iron(II) ammonium sulfate-6-water. The standardized dichromate solution is then titrated against a sample of the acidified tin(II) chloride solution (You will do this step in the next question). Evidence TITRATION OF IRON(lI) SOLUTION (volume of K2Cr2O7(aq) required to react with 15.00 ml of 0.07 mol/L Fe2+(aq)) Trial 1 2 3 4Final buretreading(ml) 13.8 24.4 35.2 45.9Initial buretreading (ml) 2.3 13.8 24.4 35.2Find the concentration of the Cr2O72-(aq) in mol/L: (give your answer to 4 decimal places)
Answer:
Follows are the solution to the given question:
Explanation:
Following are the balanced redox equation:
[tex]Cr_2O_7^{2-} + 6 Fe^{2+} + 14H^{+} \to 2Cr^{3+} + 6 Fe^{3+} + 7H_2O[/tex]
Calculating the average volume of the dichromate:
[tex](i)\ 13.8 - 2.3 = 11.5 \ ml\\\\(ii)\ 24.4 - 13.8 = 10.6\ ml\\\\(ii)\ 35.2 - 24.4 = 10.8 \ ml\\\\(iv)\ 45.9 - 35.2 = 10.7\ ml[/tex]
[tex]Mean\ volume = 10.9\ ml = 0.0109\ L\\\\moles\ Fe^{2+} \ titrated = 0.01500 \ L \times 0.07\ \frac{mol}{L} = 0.00105 \\\\moles\ Cr_2O_7^{2-}\ required = 0.00105\ mol\ Fe^{2+} \times 1 \ mol\ \frac{Cr_2O_7^{2-}}{6 \mol\ Fe^{2+} } = 0.000175 \ moles\ Cr_2O_7^{2-}\\\\Concentration \ of\ Cr_2O_7^{2-} = \frac{0.000175\ moles}{0.0109\ L} = 0.01606\ M\\\\[/tex]
Which type of molecule is shown below?
0
doch
H-CO-CH3
O A. Alcohol
O B. Ester
O C. Aldehyde
i
D. Ketone
Answer:
B. Ester
Explanation:
"Esters have the general formula RCOOR′, where R may be a hydrogen atom, an alkyl group, or an aryl group, and R′ may be an alkyl group or an aryl group but not a hydrogen atom."
The type of molecule is ester.
What is molecule?A molecule is a collection of more than one atom bound together by chemical bonds; based on the circumstances, the phrase will not include ions that meet this requirement.
What is ester?Esters were chemical molecules formed by mixing an oxoacid and a hydroxyl substance like alcohol as well as phenol.
It can be seen that molecule have -COO group which represent ester group. Hence, given molecule have ester group.
Therefore, the correct answer will be option (B).
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What word is used to refer to a group of organ systems working together?
1. organism
2. cell
3.tissue
4.organ
Answer:
1
Explanation:
in my opinion,The answer would be organism
please mark me as brainliest
a water tank is filled with water up to 3.5 m height caluclate the pressure given by the tanks at its bottom
Answer:
eşnatto
Luch bresder sksksjskdnsldkspdm
A mass of 2.20 kg of sodium phosphate is converted number of moles
Explanation:
here's the answer to your question
13.41 moles are present in 2.20 kg of sodium phosphate.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
The molar mass of sodium phosphate is 163.94 g/mol.
2.20 kg = 2200g
[tex]Moles = \frac{2200g}{163.94 g/mol.}[/tex]
Moles = 13.41954374 = 13.41 moles
Hence, 13.41 moles are present in 2.20 kg of sodium phosphate.
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For the reaction 2A + 4B ----> 2C + 2D, at a particular instant in time, the rate of the reaction is 0.0352 M/s. What is the rate of change of B? Show Work!
A. 0.0088 M/s
B. -0.0088 M/s
C. -0.141 M/s
D. -0.0352 M/s
E. 0.141 M/s
Explanation:
The given chemical equation is:
[tex]2A + 4B -> 2C + 2D[/tex]
The rate of the reaction is 0.0352 M/s.
During the course of the reaction, the rate of reactants decreases, and the rate of products increases.
The rate of disappearance of B is shown below:
[tex]rate=-\frac{1}{4} \frac{d[B]}{dt}[/tex]
So, rate of change of B is :
[tex]rate of change of B =- rate * 4\\=-0.0352 M/s * 4\\=-0.1408M/s\\\\=-0.141M/s[/tex]
Option C.
In the given reaction, rate of change of reactant B is equal to -0.141 M/s.
What is the rate of reaction?Rate of any chemical reaction defines the speed of the completion of that reaction.
In the question given reaction is:
2A + 4B ----> 2C + 2D
Rate of reaction = 0.0352 M/s.
Rate of the reaction with respect to the reactant B is written as:
Rate = [tex]${\rm{ - }}\frac{{\rm{1}}}{{\rm{4}}}\frac{{\left[ {{\rm{dB}}} \right]}}{{{\rm{dT}}}}$[/tex], where negative sign shows the disappearance of reactant B.
Rate of change of B i.e. [tex]$\frac{{{\rm{dB}}}}{{{\rm{dT}}}}$[/tex] = 4 × (-rate)
[tex]$\frac{{{\rm{dB}}}}{{{\rm{dT}}}}$[/tex] = 4 × (-0.0352) = -0.1408 = -0.141 M/s
Hence, -0.141 M/s is the rate of change of B.
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how many grams are in 1.50 moles of KMnO4
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles KMnO4, or 158.033949 grams.
Explanation:
I belive that is correct,hope it helps:)
40 POINTS! Will Mark Brainliest if correct answer and all work is shown!
In this reaction: Mg (s) + I₂ (s) → MgI₂ (s)
If 2.08 moles of Mg react with 3.56 moles of I₂, and 1.76 moles of MgI₂ form, what is the percent yield?
Explanation:
here's the answer to your question
Answer:
I'm not really sure. Sorry dude.
Explanation:
Sorry.
find out the maximum number of electrons that can be accommodate in m sell using 2n² rule
[tex]okay \: bro[/tex]
Answer is [tex]32[/tex]
Explanation:
There are mainly four shells in an atom namely K, L, M, and N.
By using 2n², we can find the maximum number of electrons present in M shell.
Let, K = 1st shell, L = 2nd shell, M = 3rd shell, and N = 4th shell.
K = 1, L = 2, M = 3 and N = 4.
K = 2n² = 2(1)² = 2(1) = 2.
L = 2n² = 2(2)² = 2(4) = 8.
M = 2n² = 2(3)² = 2(9) = 18.
N = 2n² = 2(4)² = 2(16) = 32.
So, The maximum number of electrons present in the M shell is [tex]32.[/tex]
A process which is unfavorable with respect to enthalpy, but favorable with respect to entropy Group of answer choices could occur at high temperatures, but not at lower temperatures. could not occur regardless of temperature. could occur at any temperature. could occur at low temperatures, but not at higher temperatures. none of the above
Answer:
could occur at any temperature.
Explanation:
The spontaneity of a reaction is what determines whether the reaction will occur or not. A spontaneous reaction occurs easily.
The spontaneity of a reaction is predicted by the sign of ∆G.
When ∆G is positive, the reaction is not spontaneous. When ∆G is negative, the reaction is spontaneous.
Note that;
∆G= ∆H - T∆S
Where;
∆H = Change in enthalpy
∆S = Change in entropy
T= temperature
If ∆H is unfavourable and ∆S is favourable, the reaction can proceed at all temperatures because ∆G will always be negative.
It should be noted that a process that is unfavorable as regards to enthalpy, but favorable with respect to entropy could occur at any temperature.
Enthalpy(∆H) serves as amount of internal energy that a compound has, entropy( ∆S) on the other hand serves as intrinsic disorder within the system.
However, spontaneity of a reaction determines likely hood of occurrence of a reaction, when the process is spontaneous, it makes the reaction to occurs easily.
We can conclude that whenever enthalpy is unfavourable and entropy of a system is favourable, then the spontaneity will be negative and the reaction will occur at any temperature.
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Question 5 of 10
What are the substances you start with in a chemical reaction called?
A. The products
B. The mixture
C. The reactants
D. The intermediates
Answer:
c. the reactants
Explanation:
the reactants are specifically the substances consumed in the course of chemical reaction
Which of the following processes does NOT facilitate containment?
Answer:
b is the answr
Explanation:
The correct answer is Option (B) Enrichment of Uranium-235 is done.
What is Containment? Containment is the process of preventing pollution or contamination of the immediate site environment by dust, chemicals, and other materials to prevent corrosion.What is Corrosion?Corrosion is a natural process that converts a refined metal into a more chemically stable oxide.The degree of containment is directly proportional to the degree of toxicity present in the corrosion preventive substance being applied.Why other options are incorrect?Option (A) , (C) , (D) are the options that facilitate containment because these are the processes for preventing contamination.
Hence Option (B) is correct because enrichment of uranium-235 is achieved by the process of conversion So , It does not facilitate containment
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What is the name if this compound? C6H5-C-H=O
Answer:
Benzaldehyde (C6H5CHO) is an organic compound consisting of a benzene ring with a formyl substituent. It is the simplest aromatic aldehyde and one of the most industrially useful.
such as water or oxygen,
All of the matter in a what
is the same?
Answer:
A water molecule consists of two atoms of hydrogen linked by covalent bonds to the same atom of oxygen. Atoms of oxygen are electronegative and attract the shared electrons in their covalent bonds.
How many atoms are in 9.35 moles of lithium?
Answer:
Answer: 9.35 moles Li contains 2.08 × 10 (to the power of)24 atoms .
Explanation:
