The question is incomplete, the complete question is;
Chris the Chemist was working in the lab, and he wanted to see what would happen if he put copper chloride into a Bunsen burner flame. As soon as he put it in the flame, it began to emit a green color. Which of these BEST describes this outcome?
A) The heat split the nucleus and created a new element.
B) As the copper chloride was heated, electrons were turned into neutrons.
C) As the electrons moved to a higher energy level, a photon of light is emitted.
D) When excited electrons return back to the ground state, a photon of light is emitted.
Answer:
D) When excited electrons return back to the ground state, a photon of light is emitted.
Explanation:
According to Bohr's model of the atom, electrons may absorb energy and move up to higher energy levels.
These electrons quickly return to ground state from such higher energy excited states thereby emitting the excess energy absorbed during excitation.
If the higher energy level is E2 and the ground state is E1 then the energy of the photon emitted when the electron descends from energy level E2 to E1 is;
ΔE = E2 - E1
This photon emitted accounts for the green colour of the copper salt observed when it was heated.
Which statement describes effusion?
O It occurs when a gas passes through a tiny hole.
O It occurs when a liquid passes through a tiny hole.
It occurs when gas molecules disperse throughout a container.
It occurs when a liquid disperses throughout a container.
Answer:
It occurs when a gas passes through a tiny hole.
Explanation:
Effusion is a term used to describe when a gaseous molecule in a container passes or escapes through a tiny/small hole. Effusion and diffusion are two properties of gases that are often used interchangeably, however, they differ.
Effusion differs from diffusion in the sense that the gas passes through a TINY HOLE that is smaller than the normal path. This is contrary to when gas disperses throughout a container as in diffusion.
The correct answer is:
A) It occurs when a gas passes through a tiny hole.
Electronegativity difference of F and Cl:
ionic
covalent
Answer: Electronegativity difference of F and Cl: 1.0 and is covalent
Explanation:
Answer:
1.0, covalent
Explanation:
Electronegativity difference of N and H:
0.9
covalent
Electronegativity difference of F and Cl:
1.0
covalent
Plants contain three types of tissue. Describe the function of each. What are the tissues made of?
Each plant organ (roots, stems, leaves) contains all three tissue types: ... Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem
PLEASE MARK ME AS BRAINLIEST
Atoms and elements are examples of
Answer:
A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons. An element is a substance that is made entirely from one type of atom. For example, the element hydrogen is made from atoms containing just one proton and one electron.
dose someone like to talk and will you help me to, if not we can talk
Answer:
wsppp
Explanation:
Answer:
hi.. (:
Explanation:
Which has a lower freezing point oxygen or ethanol
Answer:
Oxygen
Explanation:
i REALLY think it is
What is the most common acid and base on earth?
Answer:
hydrochloride acid
Explanation:
hope this helps :D
Cations have positive charges. Anions have negative charges. What force draws the two together?
Answer:
electrostatic attraction
Explanation:
Electrostatic attraction refers to the electrostatic force of long-range interaction occurring between the attractive electrostatic adsorption in aqueous solution with differently charged particles or uncharged particles.
Answer: Electrostatic attraction.
Explanation:
How many moles of KCl are contained in this solution?
0.486 L of a 2.0 M KCl solution
Answer:
0.972mol
Explanation:
Given parameters:
Volume of Solution of KCl = 0.486L
Molarity = 2.0M
Unknown:
Number of moles of KCl in solution = ?
Solution:
To find the number of moles of KCl in this solution, use the expression below;
Number of moles = molarity x volume
Insert the parameters and solve;
Number of moles = 0.486 x 2 = 0.972mol
why are there more hours of daylight during the summer
Answer:
Because of daylight savings
Answer:
because during the summer is when the earth is tilted a certain one. But because in different places they get summer at a different time the earth tilts differently for the places around the world.
Explanation:
Why is glucose able to pass through the gut wall
Answer:
Porque las moléculas de glucosa son salvajes
Explanation:
Answer:
Glucose cannot move across a cell membrane via simple diffusion because it is simple large and is directly rejected by the hydrophobic tails. Instead it passes across via facilitated diffusion which involves molecules moving through the membrane by passing through channel proteins.
Explanation:
D. liquid
18. Which one is the oxidizing agent in the following reaction?
CuO + H2 cu + H2O
A. Cuo
B. H2
C. Cu
D. H2O
Answer: H2O
Explanation: The given balanced chemical reaction is,
This reaction is a reversible reaction.
The rate of forward reaction will be,
The rate of backward reaction will be,
And at equilibrium the rate of reaction is equal to the rate of backward reaction divided by the rate of forward reaction.
Which of the following would be considered a compound?
He
CI
NaCl
B
Answer:
NaCl
Explanation:
because He which is helium gas its an element alone,
Cl which is chlorine is a single element,
B which is Boron and its a single element,
but NaCl which is simply called table sugar is the combination between Na, sodium and Cl, chlorine , so its called a compound not an element.
analysis of a hydride of nitrogen shows that 1g of hydrogen combined with 7g of nitrogen. What is the simplest formula of the hydride?
1 point
a)N2H
b)NH2
c)NH4
d)N2H4
Answer:
the answer in simplest form is A) N2H
How are ions formed?
Answer: Ions are formed by the addition of electrons to, or the removal of electrons from,
Explanation:
PLEASE HELP
The average weather pattern of a region over a long period of time is known as
A weather
B climate
C elevation
D conditions
Answer:
c elevation
Explanation:
C is the answer for your question
A balloon holding a 3.0 L volume of gas at sea level is suddenly
released by the child holding it. The balloon travels upwards until the
pressure around the balloon is 0.60 atm. Assuming isothermal
conditions, the new volume inside the balloon would be
Answer:
If you know your gas laws, you have to utilise a certain gas law called Charles' Law:
V
1
T
1
=
V
2
T
2
V
1
is the initial volume,
T
1
is initial temperature,
V
2
is final volume,
T
2
is final temperature.
Remember to convert Celsius values to Kelvin whenever you are dealing with gas problems. This can be done by adding 273 to whatever value in Celsius you have.
Normally in these types of problems (gas law problems), you are given all the variables but one to solve. In this case, the full setup would look like this:
2.75
291
=
V
2
318
By cross multiplying, we have...
291
V
2
= 874.5
Dividing both sides by 291 to isolate
V
2
, we get...
V
2
= 3.005...
In my school, we learnt that we use the Kelvin value in temperature to count significant figures, so in this case, the answer should have 3 sigfigs.
Therefore,
V
2
= 3.01 L
Explanation:
please mark me as the brainliest answer and please follow me
Answer:
6L im not completly sure but i wouldnt risk it
Explanation:
Part of a chemical equation is shown below.
2KOH + H2SO4 → ?
Which pair of chemicals most likely comes after the arrow to complete the equation?
A. 2K + 2H2O
B. 2K2S + SO3
C. K2SO4 + 2HNO3
D. K2SO4 + 2H2O
Answer: the correct answer is D
Explanation: I just got the quiz finished
The products of the reaction has been potassium sulfate ([tex]\rm K_2SO_4[/tex]), and water ([tex]\rm H_2O[/tex]). Thus, option D is correct.
The chemical equation has been the representation of the reactants and the products formed. The reaction of KOH and sulfuric acid has been the neutralization reaction.
The products formed by the neutralization reaction has been salt and water.
The reaction of KOH and sulfuric acid has been:
[tex]\rm 2\;KOH\;+\;H_2SO_4\;\rightarrow\;K_2SO_4\;+\;2\;H_2O[/tex]
The products of the reaction has been potassium sulfate ([tex]\rm K_2SO_4[/tex]), and water ([tex]\rm H_2O[/tex]). Thus, option D is correct.
For more information about the chemical equation, refer to the link:
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A sealed 10.0 L flask at 400 K contains equimolar amounts of ethane and propanol in gaseous form. Which of the following statements concerning the average molecular speed of ethane and propanol is true?
(A) The average molecular speed of ethane is less than the average molecular speed of propanol.
(B) The average molecular speed of ethane is greater than the average molecular speed of propanol.
(C) The average molecular speed of ethane is equal to the average molecular speed of propanol.
(D) The average molecular speeds of ethane and propanol cannot be compared without knowing the total pressure of the gas mixture.
Answer:
Im a 100% sure it is B. average molecular speed of ethane is greater than the average molecular speed of propanol.
Explanation:
Sry I didnt' get the explaination from my teacher.
According to the Kinetic theory of gases, the average speed of all gases at the same temperature will be in the same range. Hence, option C is correct.
What is kinetic theory of gases ?Kinetic theory of gases states the properties and composition of gases at a temperature and pressure. According to this theory, gaseous substances are made of tiny particles which are free to move and collide to each other.
The kinetic energy of the particles is directly proportional to the temperature. Hence, as the temperature increases, the kinetic energy increases and their average molecular speed increases.
At the same temperature, all the gases have equal range of average molecular speed irrespective of their molecular weight. Hence, at 400 K the average molecular speed of ethane and propanol will be the same.
Find more on kinetic theory :
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Using water to measure the volume of small irregular shaped objects is called? *
water replacement
water displacement
water displeasure
water reinstatement
Answer:
B. water displacement is used "graduated cylinder is filled with water (100 mL) and the object is then put inside. ... If the new water level is (120 mL) we now know that the object has a volume of 20 mL."
Explanation:
Answer:
I think it would be b.water displacement
Why does the s orbital fill before the p orbitals?
A. The s orbital is lower in energy than the p orbital.
B. The s orbital holds fewer electrons than a p orbital.
C. The s orbital belongs to a different energy level than the p orbital.
D. The s orbital is higher in energy than the p orbital.
Answer: A. The s orbital is lower in energy than the p orbital
Explanation: Just did test
The S-Orbital fill before the p-orbital Because, The s-orbital is lower in energy than the p-orbital. Hence, Option (A) is correct.
What is Afbau principle?The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill subshells of the lowest available energy, then they fill subshells of higher energy.
For example, the S subshell is filled before the P subshell is occupied.
Therefore, The S-Orbital fill before the p-orbital Because, The s-orbital is lower in energy than the p-orbital. Hence, Option (A) is correct.
Learn more about Energy here ;
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Which are examples of science rather than pseudoscience? Check all that apply.
Answer:
The second choice and the fourth choice are both based on science fact. The others are examples of pseudoscience.
Hydrogen gas is bubbled into a solution of barium hydroxide that has sulfur in it. The unbalanced equation for the reaction that takes place is: H2+S+OH- —-> S2- + H2O
What volume of 0.258 M Ba(OH)2 is required to react completely with 3.00g sulfur?
Volume of Ba(OH)₂ : 0.363 L
Further explanationBalanced equation :
H₂(g)+S(s)+2OH⁻(aq)⇒ S²⁻(aq)+2H₂O(l) (eq 1)
Ba(OH)₂⇒Ba²⁺+2OH⁻ (eq 2)
mol S :
[tex]\tt \dfrac{3~g}{32~g/mol}=0.09375[/tex]
mol OH from eq 1 : (mol S : mol OH = 1 : 2)
[tex]\tt \dfrac{2}{1}\times 0.09375=0.1875[/tex]
mol Ba(OH)₂ from eq 2 : (mol Ba(OH)₂ : mol OH⁻=1 : 2)
[tex]\tt \dfrac{1}{2}\times 0.1875=0.09375[/tex]
volume of Ba(OH)₂ :
[tex]\tt Volume =\dfrac{mol}{M}=\dfrac{0.09375}{0.258}=0.363 L[/tex]
__________ occurs when a gas changes directly into a solid without going through a liquid phase. *
sublimation
vaporization
condensation
deposition
Answer:
Deposition
Explanation:
Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process. The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.
What is the frame of reference?
Answer:
Frame of Reference
The fixed background surrounding an object, assumed to be at rest and in a fixed position.
Easy question please help. DUE IN 15 MINUTES. Calculate the frequency of light that has a wavelength of 9.75 x 10^-7 m.
Answer:
3.077 × 10¹⁴ Hz
Explanation:
f = ?
wavelength = 9.75 × 10-⁷m
using the formula,
c = wavelength × frequency
f = c/wavelength
but c(speed of light) = 3×10⁸m/s
f = 3 × 10⁸/9.75 × 10-⁷
f = 3.077 × 10¹⁴ s-¹
what is the molar mass of tin (II) sulfate?
Answer:
214.77 g/mol
Explanation:
Tin(II) sulfate
From Wikipedia, the free encyclopedia
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Tin(II) sulfate
Tin(II) sulfate crystallizes in an heavily distorted barium sulfrate structure.
Unit cell of tin(II) sulfate.
Names
Other names
Stannous sulfate
Identifiers
CAS Number
7488-55-3 ☑
3D model (JSmol)
Interactive image
ChemSpider
21106484 ☑
ECHA InfoCard 100.028.457 Edit this at Wikidata
EC Number
231-302-2
PubChem CID
62643
UNII
0MFE10J96E ☑
CompTox Dashboard (EPA)
DTXSID20884389 Edit this at Wikidata
InChI[show]
SMILES[show]
Properties
Chemical formula SnSO4
Molar mass 214.773 g/mol
Appearance white-yellowish crystalline solid
deliquescent
Density 5.15 g/cm3
Melting point 378 °C (712 °F; 651 K)
Boiling point decomposes to SnO2 and SO2
Solubility in water 33 g/100 mL (25 °C)
Structure[1]
Crystal structure Primitive orthorhombic
Space group Pnma, No. 62
Lattice constant
a = 8.80 Å, b = 5.32 Å, c = 7.12 Å[2]
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamond
010
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
LD50 (median dose) 2207 mg/kg (oral, rat)
2152 mg/kg (oral, mouse)[3]
Related compounds
Other anions Tin(II) chloride, tin(II) bromide, tin(II) iodide
Other cations Lead(II) sulfate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Tin(II) sulfate (SnSO4) is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence. It can be prepared by a displacement reaction between metallic tin and copper(II) sulfate:[4]
Sn (s) + CuSO4 (aq) → Cu (s) + SnSO4 (aq)
Tin(II) sulfate is a convenient source of tin(II) ions uncontaminated by tin(IV) species.
Which equation shows the correct relationship between mass, force, and acceleration?
A
equation 1
B
equation 2
C
equation 3
D
equations 1, 2, and 3
The acceleration on an object is proportional to the resultant force and inversely proportional to the mass of the object
Further explanationNewton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
∑F = m. a
[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Newton's equation shows that the greater the net force applied to an object, the greater the acceleration, conversely the greater the mass of the object, the smaller the object's acceleration.
You can use this principle to choose the available answer options, because the questions are not complete
What volume of 18.5 M nitric acid would be needed to make 25.0 mL of 3.0M?
Answer:What volume of 9.00 M nitric acid is needed to make 6.50 L of 1.25 M solution? 903 mL What molarity should the stock solution be if you want to dilute 25.0 mL to 2.00 L and have the final concentration be 0.103 M?
Explanation:
What is the density of an object, and what is an example of density?