The photoelectrons' kinetic energy increased with an increase in light frequency, and the current increased with a rise in light amplitude.
What is demonstrated by the photoelectric effect?
The current increased with a rise in light amplitude, and the kinetic energy of the photoelectrons increased with a rise in light frequency.
What does the photoelectric effect prove?
Light can be categorised as a wave because it demonstrates all three of the essential features of a wave—interference, diffraction, and polarisation.
The photoelectric effect, however, only makes sense if we consider light to be made up of tiny energy packets (particles) known as photons; in other words, the photoelectric effect proves that light is a particle.
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Can pewter cause lead poisoning?
Due to the deadly nature of lead, daily or regular use caused the chemical to leak out of the plate, spoon, or tankard and swiftly enter the body.
Since when is lead no longer added to pewter?Older pewters with a higher lead concentration are heavier, tarnish more quickly, and turn a darker shade of silver-grey with time. In 1974, BS5140, which was strengthened in 1994 by the European directive BSEN611, eliminated lead from the composition.
Lead toxicity from pewter?There was lead in a lot of ceramic glazes. Use any contemporary pewter you may have without worrying. Modern pewter is completely lead free and is typically designated as such. It is generally used for decorative items. Riskier is antique pewter.
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Which type of bond will most likely be found in HBr given that the electronegativity of hydrogen is 2.20 and the electronegativity of bromine is 2.96?an ionic bonda metallic bonda polar covalent bonda nonpolar covalent bond
A polar covalent bond.
Polar covalent bond:
A covalent bond in which the electron density is unevenly shared between the two bonded atoms, due to a difference in electronegativity or due to inductive effects.
There is a bond between the atoms, and electrons are shared, but they are pulled more closely towards one of the atoms in the bond. The atom that pulls the electrons more closely has a slight negative charge, and the other atom has a slight positive charge in the opposite direction.
In HBr, both H and Br are nonmetals so the bond must be covalent. The difference in their electronegativities is:
ΔE = |EN(H)-EN(Br)| = |2.20-2.96| = 0.76
Hence this bond recognized as Polar covalent bond.
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Identify the reagents needed to carry out each reaction. H20 Br NaH OH TsCI pyridine OTs TsOH Br HBr NBS KOC(CH3)3 CI H.O 2 Br 011 Cl
To solve this, we need to have a clear concept behind reactions of chemical reagent. Therefore, the reagents can be filled in below given ways.
What is chemical reagent?The word "reagent" refers to a chemical component (a compound or combination, often of inorganic or tiny organic molecules) injected into organic chemistry to produce the desired conversion of an organic material. Collins, Fenton, and Grignard reagents are among examples.
The reagent needed to carry out each reaction are:
For first reaction, reagent needed are HBr and KOC(CH[tex]_3[/tex])[tex]_3[/tex].
For second reaction, reagent needed are TsCl, pyridine and KOC(CH[tex]_3[/tex])[tex]_3[/tex].
For third reaction, reagent needed are TsOH, NBS and KOC(CH[tex]_3[/tex])[tex]_3[/tex].
For first reaction, reagent needed are Cl[tex]_2[/tex],H[tex]_2[/tex]O, NaH and HBr.
Therefore, the reagents can be filled in above given ways.
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I need the solution of C.
The maximum volume of carbon dioxide that can be formed at RTP would be 0.48 L.
Stoichiometric problemSodium carbonate reacts with hydrochloric acid according to the following balanced equation:
[tex]Na_2CO_3 + 2HCl -- > 2NaCl + H_2O + CO_2[/tex]
The mole ratio of the sodium carbonate that reacts to the carbon dioxide that is produced is 1:1. Thus 0.020 mol of sodium carbonate will be equivalent to 0.020 mol of carbon dioxide.
At room temperature and pressure (RTP), 1 mole of gas is equivalent to 24 L of gas.
Thus, 0.020 mol carbon dioxide would be equivalent to:
0.020 x 24 = 0.48 L
In other words, the maximum volume of carbon dioxide that can be produced from the reaction at RTP is 0.48 L.
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1 Calculate the atom economy to form copper(II)oxide from
CUCO3 -> CUO + CO₂
copper(II) carbonate
Answer:
thermal decomposition
Atoms with a strong attraction for electrons they share with another atom exhibit
answer choices
- high electronegativity
- zero electronegativity
a 31.0 g sample of a metal is heated to 69.84 oc, then is placed in a calorimeter containing 55.26 g of water. temperature of water increases from 22.15 oc to 26 oc. what is the specific heat of the metal?
The specific heat of the metal is 25.58°C. The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat.
Since water has a higher specific heat than other substances, it requires more energy to raise its temperature.
Calculation:The heat lost by zinc metal = heat gained by the water-q = q
-mcΔT = mcΔT ……..(1)
Where m is used to denote the mass.ΔT represents the temperature change.
c represents the specific heat capacity.
It is assumed that the initial temperature of the zinc metal = T.
The specific heat capacity (c) of water = 4.184 J / g °C.
Putting values in equation (1) -(-31.0g) × (69.84) × (26°C - T) = (55.26g) × (4.184J/g°C) × ( 26°C - 22.15°C)
2165.04 × (26°C - T) = 889.29 J
56291.04 - 2165.04 T = 889.29
- 2165.04 T = -55401.75
T = -55401.75/-2165.04
T = 25.58°C
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What is the molarity of C2H5OH water solution which will freeze at 10 degree Celsius?
The molarity of C2H5OH water solution which will freeze at -10 degree Celsius is 5.3 molar.
What is molarity?
A solution's molar concentration, also known as molarity, is the number of moles of solute present in a specific number of liter of the solution, or moles per liter.
Two indicators are used to measure it: the volume of the solution and the quantity of solute molecules. In essence, liter are used to measure the volume of the solution. "M" stands for "molarity."
According to the given question:
The depression if the freezing point
ΔTf = i ⋅ Kf ⋅m
ΔTf = -10 °C= 10 K = the depression if the freezing point
i = 1= van't Hoff's factor (ethanol is non electrolyte and does not dissociate in aqueous solution).
Kf =1.86 Kkg/mol= molal depression in freezing point constant
m= molality
ΔTf =i⋅ Kf ⋅m
10 K=1×1.86 K kg/mol × m
m=5.3 mol/kg=5.3 m
Hence, the molality of solution is 5.3 m.
Complete question:
What is the molality of C2H5OH in water solution which will freeze at -10 degree Celsius?
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3. Why were you able to identify your unknown? Explain in terms of the electronic structure of atoms.
(In other words: Why were each of these flames a different color?)
If you need more room, attach a separate sheet of paper.
Each natural element has a distinctive light spectrum that makes it easier to distinguish it from samples of unidentified or unknown compounds.
How can the electrical structure of atoms be used to identify unknown elements?The atomic number and the number of protons in an atom are the two characteristics that can be utilized to identify an element. Although it can vary depending on the atom in question, the number of neutrons and electrons is often equal to the number of protons.
What does a compound's electrical structure entail?The series of energy levels that a bound electron may occupy makes up the electronic structure of atoms and molecules. Numerous distinguishing features of an atom or molecule, including as their chemical, optical, and electrical capabilities, are determined by this electronic structure.
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the percent copper in an unknown copper compound is 26.30 %. what is the formula weight of the unknown compound? you may assume that one mole of the compound contains one mole of copper. enter your answer in units of amu.
The unidentified compound's weight in the recipe is To find the fraction, divide the percentage by 100. 63.55 divided by the fraction equals the molecular weight. 225.4 atomic units.
What is the purpose of copper compound?It is utilized in pyrotechnics, pyrolysis, anti-fouling coatings, flame proofing, printing, photocopying, and electrolysis operations. The atomic number 29 and chemical symbol Cu are assigned to the element copper.
What is the most typical compound made of copper?Cu2O, Cu2Cl2, and cuprous sulfide are a few of the significant commercial compounds of copper(I) (Cu2S). The mineral cuprite, which contains cuprous oxide as a reddish brown or red crystal or powder, naturally occurs.
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What is the row at the bottom of the periodic table called?
Answer:
Actinides
Explanation:good
:)
Why do thunderclouds grow very tall?
Answer:
This lift usually comes from differences in air density. Warmer, less dense air rises upward, creating lift. As the air lifts higher and higher, it causes a storm cloud to grow taller and taller. Thunderstorm clouds can rise up to 10 miles into the air!
What temperature is hot sink water?
The safest temperature to avoid scalding is 120 degrees Fahrenheit, but 140° seems to be the common default option. Most experts believe that any under 120 degrees Fahrenheit increases the risk of bacteria, such as legionella, which causes Legionnaire's disease, developing inside the hot water system from stagnant water.
What do Fahrenheit means?The Fahrenheit scale is a thermal scale that was proposed by physicist Daniel Gabriel Fahrenheit in 1724. The degree Fahrenheit is the unit of measurement. Fahrenheit is a temperature scale in which ice forms at 32 degrees & boils at 212 degrees. The symbol ° F represents it.
What is temperature?Temperature is a physical measure that quantifies our feelings of hotness and coldness. A thermometer is used to measure temperature.
Thermometers are scaled in a variety of temperature scales that have historically been defined by various points of reference and thermometric substances.
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The molecular geometry (shape) of the H3O+ ion is
O octahedral
O trigonal planar
O trigonal pyramidal
O bent
O tetrahedralPrevious question
Option C; The molecular geometry (shape) of the H3O+ ion is trigonal pyramidal.
A cation The hydronium ion is also known as H3O+. If we look at the nomenclature for the hydronium ion, we can see that it can also be referred to as oxonium in the IUPAC nomenclature.
The name hydronium must be used to specifically identify hydronium ions because "oxyonium" is a broad term for all trivalent oxygen cations.
19.02 g/mol is the molar mass of the hydronium ion.
The three hydrogen atoms in H3O+ form a triangle at the three corners of oxygen, and one single pair of electrons on oxygen gives H3O+ its pyramidal shape.
The hydronium ion has the chemical formula H3O+. Any time an acid dissolves in water, the hydronium ion is created.
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A gas mixture containing oxygen, nitrogen, and carbon dioxide has a total pressure of 42.9 kpa. what is the partial pressure of carbon dioxide if the partial pressure of oxygen is 6.6 kpa and the partial pressure of nitrogen is 23.0 kpa?
a. 29.6 kpa
b. 19.9 kpa
c. 13.3 kpa
d. 36.3 kpa
e. 14.3 kpa
Answer:
c
Explanation:
Whatever is left :
42.9 - 6.6 - 23 = 13.3 kpa
Answer:
13.3 kpa
Explanation:
Determine the name for Br2O A. bromine (i) oxide B. bromine oxide C. dibromine monoxide D. bromate E. bromine (ii) oxide
the correct option is (C) dibromine monoxide
Chemical formulas are collections of symbols and numbers that describe the kind of atoms and elements that make up a molecule or compound.
Dibromine silicide is the formal dibromine monoxide name of the substance. Compounds called silicides typically contain silicon together with other electropositive components. Bromine's chemical structure is Silicon's chemical structure isIt is obvious from the given name that there are two bromine atoms.
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Given that E0cell=3.20V for the reaction 2Na(inHg)+Cl2(g)⇌2Na+(aq)+2Cl−(aq)
What is E0 for the reduction 2Na(aq)++2e−→2Na(inHg)?
The cell potential of the reduction is -3.20V.
What is the reduction potential?We know that the reduction has to do with electron gain. The process is called a redox reaction because it involves the simultaneous loss and gain of electrons in the process.
We have been told that the standard electrode potential of the cell as it has been shown is 3.20V. It is also clear that the second equation that been written is only possible when we turn the cell around in which case the cell potential would become - 3.20V.
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lewis structure ibr2-
The structure of [tex]IBr^{-}_{2}[/tex] has a linear organization(shown in the figure below).
The linear [tex]IBr^{-}_{2}[/tex] structure has two axially positioned bromine atoms and three lone pairs of electrons at equatorial positions to reduce lone pair repulsions. The bending rule for [tex]sp^{3}d[/tex] hybridization states that in order to reduce repulsions between lone pairs, all lone pairs of electrons should be in an equatorial orientation. Compared to lone pair-bond pair and bond pair-bond pair repulsions, lone pair repulsions are particularly strong. [tex]IBr^{-}_{2}\\[/tex] has a linear structure as a result.
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What kind of bonding does sodium bicarbonate have?
The bond formed between the sodium bicarbonate is known as ionic bonds. They are known as metallic bonds and leads to the formation of cations.
The molecular weight sodium bicarbonate of is 84.007. Sodium bicarbonate is known as an odorless white crystalline powder which can also form lumps.
They are slightly alkaline in nature having a bitter taste.
pH (of freshly prepared 0.1 molar aqueous solution) is 8.3 at 77 °F. pH (of saturated solution): 8-9.The monosodium salt of carbonic acid, sodium bicarbonate which also has alkalinizing and electrolyte characteristics is known as sodium bicarbonate.
They dissociates into sodium and bicarbonate ions by decomposition. Ion generation raises blood pH by increasing plasma bicarbonate and buffering excess hydrogen ion concentration.
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108Xe is expected to be stable. Why is this false?
When the structure of 108Xe with S=0 is calculated, it has been noted that it contains 54 protons and 54 neutrons with strong symmetry, therefore 108Xe was thought to be stable, but when its half life is determined experimentally, it comes to be just 58 microseconds, which is truly quite low.
Xenon is a chemical element with the symbol Xe and the atomic number 54. It is a colourless, odourless noble gas found in tiny amounts in the Earth's atmosphere. Dizziness, nausea, vomiting, loss of consciousness, and death can result from excessive inhalation. Poor judgement, confusion, or loss of consciousness can all lead to death, preventing self-rescue.
Xenon is used in several specialised light sources. It emits a gorgeous blue light when activated by an electrical discharge. Xenon lamps are used in a wide range of applications, such as high-speed electronic flash bulbs for photographers, sunbed lamps, and bactericidal lights for food preparation and processing. Xenon improves long-term cognitive function in mice, reduces neuronal loss and chronic neuroinflammation, and improves survival after traumatic brain injury.
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*URGENT*
A farmer was unhappy because of his low yield. He discussed the problem with an agricultural scientist and realized that the soil of his field was either too acidic or too basic. What remedy would you suggest the farmer to neutralize the soil.?
Answer:
If the soil is too acidic, then thus we use a base (calcium hydroxide) to neutralize this soil, If the soil is too basic then we add organic matter to it as these organic matter let out acid which neutralizes the soil.
Hope it helps!
Answer:
due to exceeding of acids on the soil
Explanation:
he should use some base like calcium hydroxide to nutrilize it and make the soil ferrile
What is meant by exposure route?
Exposure route can be defined as a way by means of which a person can come in contact with the hazardous chemicals, this can be prevented by wearing personal protective equipments.
What are personal protective equipments?
Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.
It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.
It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.
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Nuclides below the valley of stability can become more stable through which of the following processes?
(a) neutron bombardment
(b) gamma emission
(c) positron emission
(d) beta emission
(e) neutron emission
The Correct option is C.
Nuclides below the valley of stability can become more stable through the process of positron emission.
What is Positron emission?Positron emission tomography (PET) is a technique that measures physiological function by looking at blood flow, metabolism, neurotransmitters, and radiolabelled drugs. PET offers quantitative analyses, allowing relative changes over time to be monitored as a disease process evolves or in response to a specific stimulus.
This technique is based on the detection of radioactivity emitted after a small amount of a radioactive tracer is injected into a peripheral vein. The tracer is administered as an intravenous injection usually labelled with oxygen-15, fluorine-18, carbon-11, or nitrogen-13.
Nuclides below the valley of stability can become more stable through the process of positron emission.
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What Is The Product Of The Following Reaction Sequence:
Answer:
H +O2 gives H20 means water
C + O2 gives Co means carbon monoxide
Al+ O2 gives Al2O3 means Aluminium oxide
Mg +O2 give MgO2 means magnesium hydroxide
to start, watch as we mix various metal nitrates and alkali metal salts. make observations of the salts in water. which rule matches the videos the best?
The correct statement about alkali metals and nitrate salts is c) Alkali metal salts and nitrate salts are always soluble.So,correct option is c.
Salts of the alkali metal salt and the ammonium ion, Li+, Na+, K+, and NH₄+ are used to soluble. Most importantly all metal nitrates and metal acetates are soluble.
The solvency of the metal nitrate in water containing carbon dioxide causes the arrangement of caverns with stalagtites and stalagmites and is liable for hardness in water. Other significant mixtures are the carbide, chloride, cyanamide, hypochlorite, nitrate, and sulfide. The dissolvability of silver nitrate is low to such an extent that everything except an irrelevant measure of it is hastened when overabundance sodium chloride arrangement is added to silver nitrate arrangement. What might be the heaviness of the hasten shaped when 100 ml of 0.5 M NaCl is added to 50.0 ml of 0.100 M AgNO₃.
Hence,correct option is c.
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(Complete question) is:
To start, watch as we mix various metal nitrates and Alkali metal salts. Which statement is true?
a) Alkali metal salts are soluble and nitrate salts are not.
b) Alkali metal and nitrate salts are never soluble.
c) Alkali Metal and Nitrate salts are always soluble
d)Alkali metal salts are not soluble while nitrate salts are soluble
Q.) Oxidation number of P in PO4³, of S in SO4² and that of Cr in Cr₂O7² are respectively:
(a) +3, +6 and +5
(b) +5, +3 and +6
(c) +3, +6 and +6
(d) +5, +6 and +6
How many moles of O2 are needed to prepare 1.00 gram of Ca(NO3)2?
Ca + N2 + 3O2 → Ca(NO3)2
A) 183 moles
B) 366 moles
C) 0.00200 moles
D) 0.0183 moles
Answer:
0.0183 moles are needed
A shot put at the Olympic games has a mass of 7250 grams and has a volume of 300.0 cm3 , what is the density of the shot put?
The density of the shot put can be given as 24.2 g/cm^3.
What is the density?We know that the density is obtained as the ratio of the mass to the volume of the object. We know that the volume is an intrinsic property hence it can be used to be able to obtain the properties of the material that is in question
Now we have some information about the material that has been discussed in the question. We are told that the mass of the object is 7250 grams and the volume of the object is 300.0 cm3.
Given the fact that we have these parameters about the question, we can now be able to obtain the density of the material by the use of the formula that can be applied for density as;
Density = mass/volume
Density =7250 grams/ 300.0 cm3
= 24.2 g/cm^3
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Is 4 degrees in the danger zone?
Bacteria grow the fastest at temperatures ranging from 40°F to 140°F, doubling in size in just as 20 minutes. This temperature range is commonly referred to as the "Danger Zone." Never put food out of the refrigerator for more than 2 hours.
How many degrees is the danger zone?The danger zone is defined as the temperature range of 40-140°F (4-60°C), where bacteria grow and thrive. It is critical to keep perishables out of the danger zone in order to keep your food safe. Keep hot foods warm and cold foods cold.
The longer food is exposed to high temperatures, the more time microbes have to grow. The primary objective is to decrease the length of time TCS meals is exposed to high temperatures. If food is kept in this temperature range for four hours or more, it must be discarded.
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the smallest particle of an element that retains its identity in a chemical reaction
Answer:
Below
Explanation:
....is called an ATOM .