Explanation:
By using different chemcial reactions
Answer:
Color combinations are produced in the sky when various metal elements are heated, exciting electrons and releasing excess energy in the form of light. The color you see is determined by the chemicals that burn at different wavelengths of light in the spectrum. Higher energy compounds (e.g. copper chloride) emit colors like violet and blue and lower energy compounds (e.g. strontium chloride) emit colors like orange and red.
Explanation:
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Help Me plz I'm so tired
1. For each of the following formulas:
1) if ionic, write the formulas of the ions; if covalent, draw the Lewis structure
2) For each covalent compound, describe the electronic and molecular geometry
3) For each covalent compound, describe the hybridization of the central atom
4) Name each compound, except the organic one.
5) How many sigma and how many pi bonds does each compound have?
MnSO4 CH3NH2 PCl5 O2 LiF
Answer:
See Explanation
Explanation:
The ionic compounds are; MnSO4 and LiF
The covalent compounds are; CH3NH2, PCl5 and O2
1) The formulas of the ions are;
MnSO4 - Mn^2+ SO4^2-
LiF - Li^+ F^-
The structure of each of the three covalent molecules is shown in the images attached to this answer.
2) CH3NH2 - Has a tetrahedral molecular geometry and electronic geometry
PCl5 - Has a trigonal bipyramidal molecular geometry and electronic geometry
O2 - Has a linear molecular geometry and electronic geometry.
3) CH3NH2 is sp3 hybridized
PCl5 is sp3d hybridized
O2 - is sp2 hybridized
4) MnSO4 - Manganese II sulphate
PCl5 - Phosphorus pentachloride
O2 - Oxygen molecule
LiF- Lithium fluoride
5) PCl5 - Five sigma bonds and no pi bond
CH3NH2 - 6 sigma bonds and no pi bond
O2 - 1 sigma bond and 1 pi bond
At 27.0°C, the volume of a gas is 630 L. At the same pressure, its volume is 92,0 mL at a temperature of
Answer:
–272.96 °C
Explanation:
From the question given above, the following data were obtained:
Initial temperature (T₁) = 27.0 °C
Initial volume (V₁) = 630 L.
Final volume (V₂) = 92.0 mL
Final temperature (T₂) =?
Next, we shall convert 27.0 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 27.0 °C
Initial temperature (T₁) = 27.0 °C + 273
Initial temperature (T₁) = 300 K
Next, we shall convert 92.0 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
92 mL = 92 mL × 1 L / 1000 mL
92 mL = 0.092 L
Next, we shall determine the final temperature.
Initial temperature (T₁) = 300 K
Initial volume (V₁) = 630 L.
Final volume (V₂) = 0.092 L
Final temperature (T₂) =?
V₁ / T₁ = V₂ / T₂
630 / 300 = 0.092 / T₂
2.1 = 0.092 / T₂
Cross multiply
2.1 × T₂ = 0.092
Divide both side by 2.1
T₂ = 0.092 / 2.1
T₂ = 0.04 K
Finally, we shall convert 0.04 K to celsius temperature. This can be obtained as follow:
T(°C) = T(K) – 273
Final temperature (T₂) = 0.04 K
Final temperature (T₂) = 0.04 – 273
Final temperature (T₂) = –272.96 °C
UV light can damage biological molecules because it has sufficient energy to break bonds within molecules. A carbon-carbon single bond typically requires 348 kJ/mol of energy to break it. What is the longest wavelength of light with energy sufficient to break this bond
Answer:
5.72 × 10⁻³¹ m
Explanation:
Step 1: Given and required data
Energy to break 1 mole of C-C single bonds (E): 348 kJPlanck's constant (h): 6.63 × 10⁻³⁴ J.sSpeed of light (c): 3.00 × 10⁸ m/sStep 2: Calculate the longest wavelength of light (λ) with energy sufficient to break this bond
We will use the Planck-Einstein relation.
E = h × c/λ
λ = h × c/E
λ = (6.63 × 10⁻³⁴ J.s) × (3.00 × 10⁸ m/s)/(348 × 10³ J) = 5.72 × 10⁻³¹ m
Which describes the sequence of events of the development of the universe?
big bang → star and galaxy formation → expansion and cooling → atom formation → continuation of expansion and cooling
atom formation → star and galaxy formation → expansion and cooling → continuation of expansion and cooling → big bang
atom formation → big bang → star and galaxy formation → expansion and cooling → continuation of expansion and cooling
big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Answer:
big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Explanation:
Answer:
D: big bang → expansion and cooling → atom formation → star and galaxy formation → continuation of expansion and cooling
Explanation:
i just took the quiz and it was right! :)
How many particle in 3.5 of CO2
Answer:
Carbon dioxide (chemical formula CO
2) is an acidic colorless gas with a density about 53% higher than that of dry air. Carbon dioxide molecules consist of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas. The current concentration is about 0.04% (412 ppm) by volume, having risen from pre-industrial levels of 280 ppm.[8] Natural sources include volcanoes, hot springs and geysers, and it is freed from carbonate rocks by dissolution in water and acids. Because carbon dioxide is soluble in water, it occurs naturally in groundwater, rivers and lakes, ice caps, glaciers and seawater. It is present in deposits of petroleum and natural gas. Carbon dioxide has a sharp and acidic odor and generates the taste of soda water in the mouth.[9] However, at normally encountered concentrations it is odorless.[1]
Carbon dioxide

Explanation:
As the source of available carbon in the carbon cycle, atmospheric carbon dioxide is the primary carbon source for life on Earth and its concentration in Earth's pre-industrial atmosphere since late in the Precambrian has been regulated by photosynthetic organisms and geological phenomena. Plants, algae and cyanobacteria use light energy to photosynthesize carbohydrate from carbon dioxide and water, with oxygen produced as a waste product.[10]
CO2 is produced by all aerobic organisms when they metabolize organic compounds to produce energy by respiration.[11] It is returned to water via the gills of fish and to the air via the lungs of air-breathing land animals, including humans. Carbon dioxide is produced during the processes of decay of organic materials and the fermentation of sugars in bread, beer and wine making. It is produced by combustion of wood, peat and other organic materials and fossil fuels such as coal, petroleum and natural gas. It is an unwanted byproduct in many large scale oxidation processes, for example, in the production of acrylic acid (over 5 million tons/year).[12][13][14]
It is a versatile industrial material, used, for example, as an inert gas in welding and fire extinguishers, as a pressurizing gas in air guns and oil recovery, as a chemical feedstock and as a supercritical fluid solvent in decaffeination of coffee and supercritical drying.[15] It is added to drinking water and carbonated beverages including beer and sparkling wine to add effervescence. The frozen solid form of CO2, known as dry ice is used as a refrigerant and as an abrasive in dry-ice blasting. It is a feedstock for the synthesis of fuels and chemicals.[16][17][18][19]
Carbon dioxide is the most significant long-lived greenhouse gas in Earth's atmosphere. Since the Industrial Revolution anthropogenic emissions – primarily from use of fossil fuels and deforestation – have rapidly increased its concentration in the atmosphere, leading to global warming. Carbon dioxide also causes ocean acidification because it dissolves in water to form carbonic acid.[20]
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?
- The temperature is always lower.
- The temperature is always the same.
- The temperature is usually lowest
- The temperature is usually higher.
The temperature at the beginning and the end of a change of state correct option is : The temperature is usually the same.
When looking at a temperature vs. time graph during a change of state, such as melting or boiling, the temperature remains constant throughout the duration of the change. This is because during a change of state, the heat energy is used to break the intermolecular bonds rather than increase the temperature. As a result, the temperature remains constant until the entire substance has completed the phase transition.At the beginning of the change of state, the substance is at its melting or boiling point, and the temperature remains constant as the substance absorbs heat energy to transition from a solid to a liquid (melting) or from a liquid to a gas (boiling). At the end of the change of state, the substance has fully transitioned, and the temperature remains constant until all the substance has completely melted or boiled.The correct option is: The temperature is usually the same.
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The temperature at the beginning of a change is always lower than the temperature at the end of the change option A
Does the temperature increase as the phase change progresses?The temperature doesn't vary during a phase transition, such as melting or boiling, until the phase change is finished. This is so that intermolecular forces can be broken rather than the average kinetic energy of the particles, which is related to temperature, being increased by the heat energy being applied to the substance.
But the temperature does increase from one point to the other on the heating curve.
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What occurs when a reaction reaches equilibrium?
1)The concentration of the reactants increases.
2)The concentration of the products increases
3)The rate of the forward reaction is equal to the rate of the reverse reaction
4)The rate of the forward reaction is slower that the rate of the reverse reaction.
Answer:
3)The rate of the forward reaction is equal to the rate of the reverse reaction
Answer:
The Rate of Forward Reaction is equal to the rate of the reverse reaction.
Explanation:
Hope this helps :)
What is the concentration of a solution with a volume of 0.900 L that contains 2.05 mol of iron (II) hydroxide?
Answer:
The concentration is 2.277
Explanation:
The formula for finding the concentration of a solution is C= mole of solute divided by the volume of the solution
Therefore, C= 2.05/0.900
C=2.277
Draw the major organic product in the reaction scheme. Be sure to clearly show stereochemistry (if applicable). The starting material is an alkyne where carbon 1 is bonded to cyclopentane and carbon 2 is bonded to H. Step 1 is N a N H 2. Step 2 is C H 3 I. Step 3 is sodium in liquid ammonia. Draw the major organic product.
Answer:
See answer below
Explanation:
The picture below will show you the final product and mechanism.
In the first step, the NaNH₂ is a strong base, so, this base will substract the hydrogen from carbon 2, to generate a negative charge there, and then, carbon 2 becomes a nucleophyle.
As a nucleophyle it will attack to the CH₃I in the next step, and it will attach to the CH₃.
The second step is just a regular step to reduce the triple bond of the alkyne to alkane or alkene, this will depend on the quantity of the reactant. In this case, an alkene.
Hope this helps,,,,,,k
The cation that has the same number of electrons (isoelectronic) as Ne is
None of the listed options
O Na
Mg 2-
All of the listed options
O AI 3-
Is This An Igneous Rock Or Metamorphic Or Sedimentary?
Answer:
Metamorphic
Explanation:
Answer: thats metamorphic rock
how many molecules are in 0.610 moles of neon gas?
A 251 ml sample of 0.45M HCl is added to 455 mL of distilled water. What is the molarity of the
final solution?
We are given:
251 mL sample of 0.45M HCl added to 455 mL distilled water
Whack a mole! (finding the number of moles):
We know that in order to find molarity, we use the formula:
Molarity = number of moles / Volume (in L)
so, number of moles is:
Number of moles = Molarity * Volume(in L)
now let's plug the values for the HCl solution to find the number of moles
Number of moles = 0.45M * 0.251 L
Number of moles = 0.113 moles
Time to concentrate (finding the final concentration):
Total final volume = 251 mL + 455 mL = 706 mL = 0.706 L
Number of moles of HCl = 0.113 moles
Molarity = Number of moles / Volume (in L)
Molarity = 0.113 / 0.706
Molarity = 0.16 M
___________________________________________________________
BONUS METHOD TIME!!!
We know the relation:
M1 * V1 = M2 * V2
where M1 and M2 are the initial and final molarities and V1 and V2 are initial and final volumes respectively
notice that I didn't mention that the volume has to be in Liters, that's because of the units being concerned with both sides of the equation, say I have the volume in mL and want to convert both these volumes to L, I would divide both sides by 1000, which would NOT change the overall value
Now, plugging values in this equation
(0.45) * (251) = (251 + 455)* (M2)
112.95 = (706)(M2)
M2 = 112.97/706 [dividing both sides by 706]
M2 = 0.16 Molar
Do u believe that you are beautiful/handsome?
Yes or No?
Besides filament-based detectors, what else are sometimes used to find flammable liquids?
A. Radar detectors
B. Dogs
C. Chemical sprays
D. Carbon monoxide detectors
Answer:
D
Explanation:
can u be my friend i'm new
Besides filament-based detectors, sometimes used to find flammable liquids are carbon monoxide detectors. Hence option D is correct.
What are detector?Detector are defined as a tool for detecting the presence of radioactivity or electromagnetic waves. Since 1881, metal detectors have been employed for diagnostic purposes. They have been used to identify a wide range of foreign bodies and medical equipment, including bullets, intraocular metallic pieces, ingested coins, and other foreign things. Detecting metallic things quickly may help with diagnosis or therapy.
Carbon monoxide detectors are defined as a tool that looks for carbon monoxide (CO) gas to stop carbon monoxide poisoning. The purpose of CO alarms is to alert you to any unexpected CO buildup in your home. These greater levels of CO may be brought on by fuel-burning appliances that are not properly maintained, installed, or operated, by fireplaces or appliances that draft backward, or by idling cars in garages.
Thus, besides filament-based detectors, sometimes used to find flammable liquids are carbon monoxide detectors. Hence option D is correct.
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what is the partial pressure of each gas in a 26L container at 27°c that holds 5 moles of carbon dioxide,3.3 moles of nitrogen and 1.5 moles of hydrogen, and has a total pressure of 1.05
Answer:
pCO₂ = 0.54 atm
pN₂ = 0.35 atm
pH₂ = 0.16 atm
Explanation:
Step 1: Calculate the total number of gaseous moles
The total number of gaseous moles (n) is equal to the sum of the moles of the individual gases.
n = nCO₂ + nN₂ + nH₂ = 5 mol + 3.3 mol + 1.5 mol = 9.8 mol
Step 2: Calculate the partial pressure of each gas
We will use the following expression.
pi = P × χi
where,
pi: partial pressure of the gas i
P: total pressure (1.05 atm)
χi: mole fraction of the gas i
pCO₂ = 1.05 atm × (5 mol/9.8 mol) = 0.54 atm
pN₂ = 1.05 atm × (3.3 mol/9.8 mol) = 0.35 atm
pH₂ = 1.05 atm × (1.5 mol/9.8 mol) = 0.16 atm
How do atoms combine to form all of the diverse types of matter in our universe?
Pls, Help with a good valid answer and explanation. will mark brainliest.
Answer:
Using electrons.
Explanation:
The properties of matter depend on the types of atoms that matter is made of. Matter can exist in two forms. It can be a pure substance. (ck12.org)
Atoms combine, or bond, using their electrons. When atoms from two or more different elements bond, they form a compound. (resources.finalsite.net) Atoms form chemical bonds with other atoms when there's an electrostatic attraction between them. This attraction results from the properties and characteristics of the atoms' outermost electrons, which are known as valence electrons. (wonderpolis.org)
Something like this??
Which of the following substances can be dissolved in pure water to give a basic solution?
Hydrogen chloride
Sodium bromide
Sodium hydroxide
Sodium chloride
I think it's sodium hydroxide
Explanation:
sodium hydroxide is a base
If the pH of a solution is 6.96, then the solution is a
Answer:
acid
Explanation:
solution with pH less than 7 is acid
those with more that 7 is base
those equal to 7 is neutral
Ice melts after adding heat. The free energy is ————— !
A. Exothermic
B. Not temperature dependent
C. Temperature dependent
D. Depended on how it is heated
E. React with active metals to form h2 gas
F. Endothermic
Unlike homogeneous solutions, the
particles in a colloid are [?] and [ ]
through a semi-permeable membrane.
A
B
visible
invisible
Unlike homogeneous solutions, the particles in a colloid are Visible, and will pass through a semi-permeable membrane. The correct options are A. and A.
What are colloidal particles?Colloidal particles are the small and minute particles that are present in the solid. Their size is from 10 nano microns to greater than 10 microns. They are visible through a membrane.
There are four types of colloidal particles that are: sol, emulsion, foam, and aerosol. These particles are solid particles and examples are milk, mayonnaise, butter, etc.
The passing through and the visibility of the colloidal particles depends on the size of the pores. If the pore size is bigger it may not transfer, but if the size is small they can transfer through the membrane.
Thus, the correct option are A. Visible, and A. Will pass.
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The question is incomplete. Your most probably complete question is given below:
A. Visible,
B. Invisible
A. Will pass
B. Will not pass
[H+] [OH-] =
NEED HELP ASAP!!!
If 3.13 mol of an ideal gas has a pressure of 2.33 atm and a volume of 72.31 L, what is the temperature of the sample in degrees Celsius?
Answer:
382.49 C degree Celsius
Explanation:
Hello,
This problem deals with understanding the ideal gas law which hopes to predict how ideal gases might behave in any given condition. I listed the formula below and we are basically just going to solve for temperature by rearranging the equation as seen on the picture (there's also other rearranged ones in case you need to solve for those).
Universal gas constant R has a value of 0.0821 L * atm/(mole * K) when working with these given units so it will be part of this equation. R value changes based on what units you have.
T = PV/nR
= (2.33) (72.31) / (3.13)(0.0821)
= 655.64 K
Question is asking temperature in celsius so we employ the formula attached below:
C = K - 273.15
= 655.64-273.15
= 382.49 degree Celsius
382.49 degree Celsius is the answer!
A gas contained in a steel tank has a pressure of 1.5atm at a temperature of 320K. What will be the gas pressure when the temperature changes to 450K at a constant amount of gas and volume?
Answer:
2.109 atm
Explanation:
This is Gay-Lussac's Law when the temperature of a sample of gas in a rigid container is increased, the pressure of the gas increases as well. The increase in kinetic energy results in the molecules of gas striking the walls of the container with more force, resulting in a greater pressure. Gay-Lussac's Law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant. Gay-Lussac's Law is very similar to Charles's Law, with the only difference being the type of container.
So for this one:
[tex]\frac{P_{1} }{T_{1}} =\frac{P_{2} }{T_{2}}[/tex]
Rearrange it to
P2= (P1 x T2)/T1
P2= (450 x 1.5)/320 = 2.109 atm
What is the molarity of a 750.0 milliliter solution containing 2.5 moles of solute?
ОА.
1.9 M
OB
0.0033 M
O c.
1,875 M
OD.
0.30 M
OE.
3.3 M
Molarity : It is defined as the number of moles of solute present in one liter of solution.
Therefore, the molarity of solution is 3.33
A. 1.9 M
B. 0.0033 M
C. 1,875 M
D. 0.30 M
E. 3.3 M
A bowl containing 70 grams of water, is heated from 10 °C to 90 °C. The specific heat of
water is 4.184 J/gºC. How much heat energy is required to heat the water?
Answer:
23430.4 J.
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 70 g
Initial temperature (T₁) = 10 °C
Final temperature (T₂) = 90 °C
Specific heat capacity (C) = 4.184 J/gºC
Heat (Q) required =?
Next, we shall determine the change in the temperature of water. This can be obtained as follow:
Initial temperature (T₁) = 10 °C
Final temperature (T₂) = 90 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 90 – 10
ΔT = 80 °C
Finally, we shall determine the heat energy required to heat up the water. This can be obtained as follow:
Mass (M) = 70 g
Change in temperature (ΔT) = 80 °C
Specific heat capacity (C) = 4.184 J/gºC
Heat (Q) required =?
Q = MCΔT
Q = 70 × 4.184 × 80
Q = 23430.4 J
Therefore, 23430.4 J of heat energy is required to heat up the water.
What is the source of energy in nuclear weapons?
A. Combustion
B. Gravity
C. Fusion
D. Fission
How is matter classified,Give example for each?
Matter can be classified into 2 groups, Pure substance and Mixture.
Pure substance is a type of matter with "the same physical and chemical properties throughout the sample". Examples include tin, copper, oxygen, chlorine.
Mixtures on the other hand, are two or more combined substances that can be seperated. Some examples include smog, mud, sea water and air.
When electrons move to a shell closer to the nucleus, energy is released as
Answer:
it is released as lower energy
lower energy will be the answer
hope it helps!!!!!