Explanation:
In general, catalytic action is a chemical reaction between the catalyst and a reactant, forming chemical intermediates that are able to react more readily with each other or with another reactant, to form the desired end product.
I hope it's helpful!!
Đối với nguyên tử của các nguyên tố trong cùng một nhóm (trừ 2 cột cuối của nhóm VIIIB), mối quan hệ giữa số thứ tự của nhóm và electron hóa trị như thế nào?
Answer:
For atoms of elements in the same group (except the last 2 columns of group VIIIB), what is the relationship between the group number and the valence electron?
Most scientist believe the Big Bang Theory explain which of the following statements?
Answer: 1. How our universe began. 2. Fred Hoyle.
Explanation: Hope this helps
Most scientist believe the Big Bang Theory explain how our universe began and is denoted as option B.
What is Big bang theory?This theory talks about how a single point began to expand which resulted in the formation of the universe.
It was coined by Fred Hoyle thereby making it the most appropriate choice in this scenario.
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An icecube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone
Answer:
That's called an physical change which is an change in the state of matter
Explanation:
Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.
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6. A food supply company produces Yellow-42 (from previous example) in 200-gram wholesale bottles. How many grams of FeCl3 would be needed to produce one bottle of Yellow 42?
7. How much NaOH would be needed to produce one bottle of Yellow 42?
8. Iron (III) chloride is fairly expensive, and the company does not want to waste any during the reaction process. How could the company set up this reaction in a way that ensures no iron (III) chloride is wasted in the reaction?
A food supply company produces Yellow-42 (from previous example) in 200-gram wholesale bottles. The grams of FeCl3 needed to produce one bottle of Yellow 42 is 303.638 grams. The amount of NaOH needed to produce one bottle of Yellow 42 is 226.32 grams.
The mass amount of Yellow 42 = 200 gramsThe molar mass of Fe(OH)3 needed to produce 1 bottle of Yellow 42 = 106.845 g/mol
∴
Using the relation for the number of moles which is:
[tex]\mathbf{number \ of \ moles = \dfrac{mass }{molar \ mass}}[/tex]
[tex]\mathbf{number \ of \ moles \ of \ Yellow \ 42 = \dfrac{200 g }{106.867 \ g/mol}}[/tex]
[tex]\mathbf{number \ of \ moles \ of \ Yellow \ 42 =1.872 \ moles}[/tex]
Now,
If 1 mole of Fe(OH)₃ requires 1 mole of FeCl₃1.872 moles of Fe(OH)₃ will require 1.872 moles of FeCl₃∴
Mass of FeCl₃ required = number of moles of FeCl₃ × molar mass of FeCl₃
Mass of FeCl₃ required = 1.872 moles × 162.2 g/mol
Mass of FeCl₃ required = 303.638 grams
7.
Recall that:
1 bottle of the yellow requires 1.872 moles of the Fe(OH)₃Thus, 1 mole of Fe(OH)₃ requires 3 moles of NaOHNow, 1.872 moles of Fe(OH)₃ will require (3 × 1.872 moles of NaOH)
= 5.616 moles of NaOH
Thus, the amount of NaOH in grams, that will be needed to produce one bottle of Yellow 42 is:
= 5.616 moles × 40.3 g/mol (molar mass of NaOH)
= 226.32 grams of NaOH
8.
The company could set up this reaction in a way that ensures no iron (III) chloride is wasted in the reaction by using the concept of the stoichiometry of the reaction involved in the system and he should feed the reactant within the ratio of 1:3 for FeCl₃ and NaOH respectively.
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PLEASE HELP
ONE WRITTEN QUESTION
NO LINKS!!!!!!!!
- Using the graph above, describe the connections between temperature of a solvent and the solubility of a solute that is a solid.
Answer: The higher the temperature the easier a solid will dissolve.
Explanation: This is because the heat 'excites' the solvent making it easier for it to break apart/ split away from each other
a. What type of elements are found in each group?
Answer:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
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FOLLØW ME PLEASE THANKS IN ADVANCE
Heart my answer if it's helpful
BRAINLIEST MY ANSWER IF you want
what is the bond formation of Ag and N
Answer:
Electrovalent / Ionic bond
Explanation:
Hope it helps!!
which element has the highest monetary value?
A) gold
B) Silver
C) nickel
D) lead
Answer:
A. gold has the highest monetary value?
Among the given elements, gold has the highest monetary value. So the correct option is A.
What is gold?
Gold (Au) is a chemical element that belongs to Period 6's Group 11 (Ib) and is a thick, glossy golden valuable metal. Gold has historically been extremely valued due to a number of characteristics. It is typically found in nature in a relatively pure form, is appealing in colour and brightness, resilient to the point of virtual indestructibility, and very flexible.
Due to its perceived worth from the beginning, gold has a history that is unmatched by that of any other metal. Gold is one of the densest metals.
It is a good heat and electrical conductor. It is also the softest, most malleable, and ductile of all the elements; a troy ounce (31.1 grammes) of gold may be hammered into gold leaf, which can be crushed into sheets as thin as 187 square feet (approximately 17 square metres).
Therefore the correct option is A.
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1 L, 1000 mL, and 1000 cm are considered to be
EQUIVALENT or NON EQUIVALENT UNITS.
Answer:
equivalent
Explanation:
hope it works
A model of Nuclear Fusion?
Answer:
a proton turns into an atom that goes kabloey into fission products and other neutrons.
Explanation:
tác giả văn bản mẹ tôi là ai ?
Answer:
Tác giả văn bản ' Mẹ tôi ' : Edmondo De Amicis ( 1846-1908 ) là nhà văn người Ý ( I-ta-li-a )
A neutron strikes an atom of uranium-235 to start a fission reaction. A student expresses this situation as 01n+235 92U. Which statement describes why the expression is incorrect?(1 point)
A neutron should be expressed as 10n, not 01n.
A neutron should be expressed as 0 to the 1th power n, not 1 to the 0 power n.
The mass number for uranium-235 is in the wrong location.
The mass number for uranium-235 is in the wrong location.
The atomic number for uranium-235 is in the wrong location.
The atomic number for uranium-235 is in the wrong location.
A neutron should be expressed as 11H, not 01n.
The expression is wrong because the neutron should be expressed as 10n, not 01n.
A neutron is a particle that has a mass of 1 but no charge. It is a neutral particle. Seeing that the neutron is uncharged, it has a charge of zero hence zero must be written under.
The mass of the neutron is 1 so 1 must be written on top. The correct way of writing the equation for the decay of U-235 is; 10n + 235 92U.
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Answer:
A neutron should be expressed as 10n, not 01n.
Explanation: I just did it
How does avogadro relate to Mole Day.
Answer:
How is Avogadro constant related to mole?
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.
Explanation:
Question 5 of 5
A student is making a model of the famous Giza pyramid,
which has four triangular sides and a square base. The
scale of the model is 1:1,000.
How many sides should the model pyramid have?
A. 6
B. 4
O
C. 12
O D. 3
Could you guys help me pls
what is the atomic number of this atom?
Answer:
4
I think so
have a great day
Answer:
I think it is option one (3)
The least dense gas is
neon
fluorine
krypton
chlorine
Answer:
Out of the options provided Neon is the least dense gas
Explanation:
A train travels 18 kilometers in 12 minutes. At this rate, how far does the train travel in 1 minute?
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Distance covered in 12 minutes = 18 km, now
Unit rate is equal to :
[tex] \dfrac{18}{12} [/tex][tex] \dfrac{3}{2} [/tex][tex]1.5 \: \: \: km \: \: per \: \: minute[/tex]The train travels 1.5 km in 1 minute time interval.
Answer:
[tex]\huge\boxed{\sf 1\ minute = 1.5\ kilometers}[/tex]
Explanation:
12 minutes = 18 kilometers
Divide both sides by 12
12/12 minutes = 18/12 kilometers
1 minute = 3/2 kilometers
1 minute = 1.5 kilometers
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807
explain how a metal and a non-metal form an ION when they chemically react together.
Answer:
When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound. In all of these reactions, the metal atoms give electrons to the non-metal atoms.
Hạt tạo thành khí oxi có mấy nguyên tử oxi liên kết với nhau?
Answer:
hạt tạo thành khí oxi có 2 nguyên tử O liên kết vơi nhau ; kí hiệu là O₂
Explanation:
13. Acid-catalyzed dehydration-condensation reactions of carboxylic acids and alcohols produce chemicals called
esters.
i. Using carbon skeletal notation, write the dehydration-condensation reaction that occurs between ethanol
and butanoic acid.
ii. What is the name of this ester?
Answer:
A condensation reaction joins two larger molecules by splitting out a smaller molecule — usually water or ammonia — between them.
In an esterification reaction, an OH from the acid and an H from the alcohol form a molecule of water.
The larger parts join to form the ester.
Ethanol and butanoic acid react to form ethyl butanoate.
Acid-catalyzed dehydration-condensation reactions of carboxylic acids and alcohols produce chemicals called "esters". The dehydration-condensation reaction occurs between 'ethanol' and 'butanoic acid' giving an ester called as "ethyl butanoate".
What is an ester and how it is formed?Esters are produced when carboxylic acids are heated with alcohols in the presence of an acid catalyst. The catalyst is usually concentrated sulphuric acid. Dry hydrogen chloride gas is used in some cases, but these tend to involve aromatic esters (ones containing a benzene ring).Esters are represented by the formula RCOOR', where R and R' are hydrocarbon groups. The chemical reaction occurring in the formation of the ester is known as an esterification reaction.The reaction that occurs between ethanol and butanoic acid:Ethanol reacts with butanoic acid in the presence of an acid-catalyst and gives ethyl butanoate as ester and water as products. If an acid reacts with a base, salt and water are the products. But ester is not a salt.
i) The carbon skeletal notation for the given reaction is shown below.
ii) The ester is named "ethyl butanoate".
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What is the difference between primary scale and extension scale?
Answer:
8txirzrz8rzrirzriz£=,£=,,-8/-9/-¥/
Explanation:
otcitxfi
NEED HELP ASAP!!!!!!!!!!!!
convert 2.5 X 10^24 atoms of copper to grams of copper
2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.
HOW TO CALCULATE MASS:
The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. That is;mass of substance (g) = no. of moles (mol) × molar mass (g/mol)However, the number of moles of copper must first be calculated by dividing the number of atoms by Avogadro's number as follows:no. of moles of Cu = 2.5 X 10²⁴ ÷ 6.02 × 10²³no. of moles = 2.5/6.02 × 10²⁴-²³no. of moles = 0.42 × 10¹no. of moles = 4.2moles of copper. Molar mass of copper = 63.5g/molMass of copper = 4.2mol × 63.5g/molMass of copper = 266.7gTherefore, 2.5 X 10²⁴ atoms of copper is equivalent to 266.7g of Cu.
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2. Why do researchers need a lot of data to monitor a species population? What trends can
you see in the data that you would have missed otherwise?
Science
To study the population of a species we have to collect many data regarding the factors affecting the growth of the species and those which adversely affects their survival.
What is population monitoring?A key element of conservation practice and policy is species population monitoring, which is defined here as the regular, systematic gathering of data to detect long-term changes in the populations of wild species.
To examine regional, chronological, taxonomic, and methodological patterns in global species monitoring, we built a database of over 1200 programs .
Through standardized web searches, an online stakeholder survey, thorough national searches in a selection of nations, and a review of international biodiversity databases, we discovered monitoring systems.
Most taxonomic groups continue to have scant and poorly coordinated monitoring, and the majority of the data produced are elusive and unlikely to contribute to larger processes for biodiversity conservation.
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Help!! Need it asap thankyou!
Answer:
ano gagawin dyan? HAAHAHA
HELPPP PLEASE ITS ABOUT MOLARITY
We can use the formula M₁V₁ = M₂V₂ to determine the moles remaining after the volume is decreased due to evaporation..
Since M₁V₁ = M₂V₂ (starting mole × starting volume = end mole × end volume)
⇒ (0.125 mol)(265 mL) = M₂ (186 mL)
33.125 mol/mL = 186 mL × M₂
⇒ M₂ = 33.125 mol/mL ÷ 186 mL
= 0.178 mol
define isotope
hello
Answer:
Isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties.
Hello Sis!!!!!!
Answer:
Isotopes are atoms of the same element that have the same atomic number but different in mass number.
Why does silicone dioxide have a high melting point ?
Answer:
Where SiO2 has strong covalent bonds between molecules, SO3 only has weak van der waals intermolecular forces holding its molecules together. Since covalent bonds require more energy to overcome than van der waals, SiO2 requires a higher temperature than SO3 to melt, thus SiO2 has a higher melting point.
What is the identity of this atom?
A spiracle ball of lead has a diameter of 3.5 cm. What is the mass of the sphere if lead has a density of 11.34 g
Answer:
mass = volume x density
volume = πr²
since Diameter = 3.5 cm
then radius = 1.75cm
∴ volume = π x (1.75cm)³
≈ 16.8369731 cm³
Thus mass = 16.8369731 cm³ x 11.34 g / cm³
= 190.93 g