The chemicals found at the crime scene although not mentioned must be Sodium zincate.
Discussion:
An interesting demonstration to show plating and alloys is the conversion of copper coins to silver look-alike coins.
A 'copper' coin when dipped into a solution of sodium zincate in contact with zinc. The coin is plated with zinc and appears silver in colour.
This is a common chemistry classroom trick.
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You have a sealed 2 liter flask that contains nothing but water and carbon dioxide. The flask is half-filled with liquid water, has a temperature of 25°c, and the overall pressure within the flask is 0. 1 atm. How many moles of co2 are in the flask? at this temperature, you may take the kh value for co2 as 0. 033 m / atm.
In this exercise we want to calculate the amount of moles, so this is going to be:
[tex](4.6)(10^{-3}) \ mols \ CO_2[/tex]
Knowing that Henry's law is given by:
[tex]C = KHP[/tex]
Where constants are given by:
C = Concentration KH = Henry's law constant = [tex]0.033 m/atm[/tex]P = partial pressure = [tex]0.07 atm[/tex]Before we can find the concentration of CO2 (and hence the moles of CO2), we first need to find its partial pressure. We look up the vapor pressure of water at 25º and find it to be 0.03 atm. Since the total pressure is equal to 0.1 atm, this mean the partial pressure of:
[tex]CO_2 = 0.1 \ atm - 0.03 \ atm = 0.07 \ atm[/tex]
Now using Henry's law, we find the concentration:
[tex]C = (0.033)*( 0.07) = (2.31)*(10^{-3})[/tex]
Converting to moles of CO2, we have:
[tex](2.31)*(10^{-3})*( 2) = (4.6)*(10^{-3})[/tex]
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Which class of macromolecule was described as being most like the hydrocarbons?.
Answer:
Fats........................
Lipids is the class of macromolecule was described as being most like the hydrocarbons.
what are Macromolecules ?Macromolecules are bigger molecules of large size and made of smaller molecules called as monomers, Polymers are macromolecules.
All Macromolecules are not like the hydrocarbon because the macromolecules not only consists of C and H atoms but also N and O.
Macromolecules are classified into 4 types
Proteins , Carbohydrates , Lipids and Nucleic Acids
Lipids is the class of macromolecule was described as being most like the hydrocarbons.
Lipids are a broad category of chemicals that are mostly nonpolar in nature.
This is due to the fact that they are hydrocarbons with nonpolar carbon–carbon or carbon–hydrogen bonds.
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A sound wave is an example of a __________ wave. It requires a _________ to transfer energy
Question 2 options:
medium, longitudinal
longitudinal , medium
medium, transverse
transverse, medium
Answer:
example of a medium, it requires a transverse
When a certain isotope, such as Pa-231, is hit by a neutron, it will always split into the same smaller nuclei.
true or false
Answer: false
Explanation:
how many repeat units are required to make a nylon polymer with a formula weight of 15,000 amu?
This problem is giving information about a nylon polymer whose molar mass is 15,000 amu (atomic mass units).
The first subject of matter here, is to recall the monomeric molecular formula of nylon which is C₁₂H₂₂N₂O₂, and the definition of monomer (basic molecule able to react and form a polymer) and polymer (assembling of monomers).
Next, we calculate the molar mass of the monomer of nylon:
[tex]12*12.01+22*1.01+2*14.01+2*16.00=226.31amu[/tex]
Finally, the number of units is calculated by dividing the molar mass of the polymer and the monomers:
[tex]n=\frac{15000}{226.31} =66.2[/tex]
Which is about 66 monomers.
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https://brainly.com/question/21230841https://brainly.com/question/15160603Answer:
66 monomers
Explanation:
a. How many protons?
b. How many neutrons?
c. What is the name of this atom?
PLS HELP ILL GIVE BRAINLIEST
The diagram shows fertilization, the union of sperm cell and egg cell.
The traits of the offspring of the fertilized egg are coded onto
A
lipids in the offspring's cell membranes.
B
enzymes in the offspring's ribosomes.
C
genes in the offspring's chromosomes.
D
water in the offspring's mitochondrion.
what is the molecular formula for sodium sulphur and oxygen
Answer: Na2SO4
The molecular formula for sodium sulphur and oxygen is: (Na2SO4)
, Hope this helps :)
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Which pair of objects is experiencing the greatest gravitational force?
2 kg
2 kg
A.
d = 5 m
2 kg
2 kg
B.
dolm
5 kg
skg
doim
3 kg
skg
OD
da 5 m
Answer:
c
Explanation:
What is the molarity of an ethanol solution containing 10.0g of ethanol in
water with a total volume of 100ml?
Answer:
2.17 moldm-3
Explanation:
Molarity is the number of moles of solute in a unit volume.
The atomic masses of
C -12
H-1
O-16
Therefore molar mass ( mass of 1 mol ) of ethanol ( CH3CH2OH )
( 12 x 2 ) + (1 x 6) + 16 = 46 g/mol
In 10 g of ethanol 10/46 mol should be present
So the molarity is (10/46) mol ÷ 100ml
= 10/ 46 mol ÷ 0.1 l
1L = 1 dm3
Therefore molarity = 10/46 mol ÷ 0.1 dm3
= 2.17 mol/dm3
What is the major product formed when the alcohol is treated with hcl?.
Answer: Alcohol undergoes nucleophilic substitution when reacted with hydrohalic acids (HX) such as HCl.
Explanation:
put these atoms in order of increasing radius: Na, Mg,Cl, P
Answer:
Cl < P < Mg < Na
Explanation:
Cl must have the smallest radius because it is located to the right of the remaining elements on the same row. P must have the second smallest radius because it is located to the right of the remaining elements on the same row. Mg must have the Third smallest radius because it is located to the right of Na on the same row. Therefore, Na has the Largest radius.
I hope it helps.
Read through the literacy task
find the mistakes and rewrite
Find and highlight the 10 mistakes
Atoms are the smallest particle that make up living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons and neutrons are in the nucleus and the protons orbit around the nucleus. Of the subatomic particles, the electrons have the largest mass and are negatively charged, the neutrons (negative charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons, so carry no overall charge. An element is a substance made up of only two types of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass which represents the number of electrons or neutrons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
Answer:
Atoms are the smallest particle that make up living both living and non living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons protons and neutrons are in the nucleus and the protons electrons orbit around the nucleus. Of the subatomic particles, the electrons have the largest smallest mass and are negatively charged, the neutrons (negative charge) (no charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons electrons, so carry no overall charge. An element is a substance made up of only two one type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic mass number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass atomic number which represents the number of electrons or neutrons protons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
Solid calcium hydroxide is dissolved in water until the pH of the solution is 11.44. The hydroxide ion concentration [OH–] of the solution is:______.A. 1.1 * 10-11 M.B. 3.06 M.C. 8.7 * 10-4 M.D. 1.0 * 10-14 M.E. None of these.
Answer:
c the answer is c that is the answer
which value represents the first ionization energy of a nonmetal
Answer:
increase in going from left to right across a given period.
Explanation:
Nonmetals, which are found in the right-hand region of the periodic table, have relatively large ionization energies and therefore tend to gain electrons. Ionization energies generally increase in going from left to right across a given period.
hope it is helpful:)
Which sample is a pure substance?zinc oxidesugar dissolved in waterpond watersoil.
Answer:
Oxide sugar dissolved in water pond
because water + sugar= sugar melts but the oxide purifys the water.
Explanation:
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What is the IUPAC name for NH3? ammonia mononitrogen hydride mononitrogen trihydride nitrogen trihydride.
The IUPAC name for NH3 is Ammonia
The IUPAC name is also known as (International Union of Pure and Applied Chemistry) and it is a standardized system by chemical scientists for naming chemical compounds.
The IUPAC name for NH3 is Ammonia. Ammonia is a colorless gas with a stifling odor that is an exceedingly unpleasant pungent smell. It dissociates quickly in water to generate ammonium hydroxide, which can irritate and burn the skin.
It serves an agricultural purpose such as fertilizer.It is also used for the production of plastics, textiles, insecticides, etc.Learn more about the IUPAC naming system here:
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Please help I have a C in advance chemistry
Answer:
I think it's 2.50M IM NOT SURE THOUGH SO I RECOMMEND WAITING FOR ANOTHER ANSWER
The reactants A and B react completely in a sealed container to form a product. What is the mass of the product of the reaction between 3.0 grams of reactant A and 5.7 grams of reactant B?
Answer:
I'm pretty sure it is 8.7
Explanation:
and btw you are fineeee
Convert 1.56x10^30 particles of sodium chloride to grams of sodium chloride
Answer:
I cannot tell yet
Explanation:
I don't take that class yet but ill get back to you
How many total atoms are given in the compound 5ZnSO4?
Answer: 6 total atoms
Explanation:
Protons
Charge:
Mass:
Location:
Role in the atom:
Answer:
Protons are positively charged. The mass is slightly lower than a neutron.The location of a proton is nucleus. The the role of a proton is to help bind the nucleus together.
Explanation:
what is the formula for cadmium (ii) chlorate?
Answer:
a chemical compound
Explanation:
copper(ii) chlorate is a chemical compound of the transition metal copper and the chlorate anion with basic formula cu(cio)3 and 2
Arrange the events for the hydrolysis of amide bonds by chymotrypsin in their correct order.
1. attack by Ser 195 to give a tetrahedral intermediate
2. protonation by His 57 and release of the free C-terminus of the hydrolyzed bond
3. protonation by His 57 and release of the free N-terminus of the hydrolyzed bond
4. attack by water, leading to formation of a tetrahedral intermediate
5. binding of substrate to properly position the scissile bond for cleavage
a. 5, 1, 3, 4, 2
b. 5,1,2,4,3 5,
c. 1, 3, 2,4 5,
d. 2, 4, 3, 1
Answer:
The answer is A
Explanation:
the order 5,1,3,4,2
In the reaction below the total mass of calcium in the reactants is 40. What is the total mass of calcium in the products?
Answer:
40
Explanation:
The total mass of calcium in the products is 40
What is the total mass number?The mass number (represented by the letter A) is defined as the total number of protons and neutrons in an atom. Consider the table below, which shows data from the first six elements of the periodic table. Consider the element helium. Its atomic number is 2, so it has two protons in its nucleus.
How do you find the mass number?Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
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An iron object alloyed with cobalt rusts more quickly than a pure iron object. However, an iron object alloyed with manganese rusts less quickly than a pure iron object under the same conditions. This is true because: __________
a. cobalt is a stronger reducing agent than iron
b. iron is a stronger reducing agent than manganese
c. cobalt exhibits more metallic character than either iron or manganese in the iron-manganese alloy
Rusting is an electrochemical reaction. Iron rusts faster when alloyed with cobalt than when alloyed with manganese because, in the iron-manganese alloy, manganese is rendered the anode and iron is rendered the cathode
An alloy is a combination of two metals. There are various reasons for producing alloys such as greater tensile strength, corrosion resistance and improved aesthetic appearance.
When iron is alloyed with cobalt, the iron rusts faster than pure iron because iron is rendered the anode and cobalt is rendered the cathode. When the iron is alloyed with manganese, it rusts more slowly than pure iron because in the iron-manganese alloy, manganese is rendered the anode and iron is rendered the cathode.
Missing parts;
An iron object alloyed with cobalt rusts more quickly than a pure iron object. However, an iron object alloyed with manganese rusts less quickly than a pure iron object under the same conditions. This is true because
(1) cobalt is a stronger reducing agent than iron
(2) iron is a stronger reducing agent than manganese
(3) cobalt exhibits more metallic character than either iron or manganese
(4) in the iron-manganese alloy, manganese is rendered the anode and iron is rendered the cathode
(5) in the iron-cobalt alloy, cobalt is rendered the anode and iron is rendered the cathode
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How many milliliters of a stock solution of 12.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3
Answer:
(5.00M)(X) = (0.120L)(0.470M)
X = (0.120)(0.470)/(5.00)
0.01128
Explanation:
12.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3 stock solution is 0.01128 milliliters.
What is stock solution ?
The ideal way to define stock solutions is as concentrated solutions with precise, known concentrations that will be diluted for later laboratory usage. Even though you may decide against making stock solutions, doing so may help you run your business more efficiently and save you a ton of time and money.
where C1 x V1 = C2 x V2. Stock concentration, C1 ( beginning concentration ) V1 is the amount of stock needed to make the new solution. C2 is the concentration of a fresh or effective solution.
( 5.00M ) ( X ) = ( 0.120 liter ) ( 0.470 M )
Then, X = 0.120 × 0.470 ÷ 5.00
= 0.01128 milliliters.
Thus, 12.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3 stock solution is 0.01128 milliliters.
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What is carbon? What does it do?
Answer:
Carbon is in carbon dioxide, which is a greenhouse gas that works to trap heat close to Earth. Carbon is the chemical backbone of life on Earth. Carbon compounds regulate the Earth's temperature, make up the food that sustains us, and provide energy that fuels our global economy. Most of Earth's carbon is stored in rocks and sediments. The rest is located in the ocean, atmosphere, and in living organisms
Explanation:
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Helium (he) has two valence electrons, and these electrons are located in the 1s subshell. Without using the periodic table, in which group and period is helium located?.
helium is in group 8 and period 1
20
How do you solve this ?
Answer:
eight oxygen atoms
Explanation:
This formula shows that in one mole of this compound, there are 3 moles of Ca atoms that combine with 2 moles of the PO4(phosphate) groups, which gives a total of 2 moles of P atoms and 8 moles of 0 atoms.