They create a redox reaction between zinc solid and zinc ions using additive plating. As a result, neutral zinc atoms were produced, which were then deposited onto copper coins.
A technique for coating one metal on top of another called electroplating. Typically, this is carried out for decorative, industrial, or coin-making purposes.
There are two methods for coating a metal:
1. Additive plating
2: Displacement plating
In additive plating, a species in a solution that contributes electrons reduces metal ions. Now, the reduced metal begins to deposit on top of another metal.
When the plating metal is present in the solution during displacement plating, a metal with a lower oxidation number displaces a metal with a higher oxidation number.
The only method used by counterfeiters to create fake coins is additive plating, in which the coinage metal is deposited on top of another base metal.
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Certain minerals exclude lead but not uranium from their crystal structure, so when the minerals form they have no lead, only uranium. As time goes on, the uranium decays to lead, so measuring the ratio of lead atoms to uranium atoms allows investigators to determine the ages of the minerals. If a sample of a mineral contains 3 atoms of 207Pb207Pb for every 1 atom of 235U235U, how many years ago was it formed
Answer:
The answer is "[tex]1.4 \ \bold{ billion-years}[/tex]".
Explanation:
Using formula:
[tex]\to N_{Now} = N_{orige}e^{\lambda t} \\\\[/tex]
[tex]\to[/tex] 1 U atom produces 1 Pb atom after decay.
[tex]\to[/tex] U's original numbers are now the sum of U counts and Pb counts.
[tex]\to N_U=(N_U+N_{pb})e^{\lambda Ut}[/tex]
[tex]\to 1 = (1+3) \ exp[(\frac{-\ln(2)}{t_{(half)}} \times t ]\\\\\to t = [\frac{\ln(4)}{\ln(2)}] \times t_{(half)}[/tex]
[tex]= 14 \times 10^8 \ \ years\\\\=1.4 \ billion \ \ years[/tex]
The figure shows a nutrition label. How much energy does this food contain?
Answer:
i need help with that too.
Explanation:
What type of circuit has a broken path that does NOT let current flow through it?
A : Closed circuit
B: Open circut
C : Toggle
D : Switch
Answer:
B
Explanation:
Round the following number to 3 significant figures:
15937
pls helpppp
Answer:
15900
Explanation:
I think hope this helps!! :D
Answer:
15900
Explanation:
Why do silver and copper have similar properties?
(7th Grade science)
Answer:
They are both listed under group 11 on the periodic table and both are highly conductive of electricity
Explanation:
HOPE THIS HELPS ^^
What is the density of an object that has a mass of 10 grams and a volume of 5 mL?
Answer:
2 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{10}{5} = 2 \\ [/tex]
We have the final answer as
2 g/mLHope this helps you
The Universal Space Agency wants to know the results of your Sim investigation. Write your report to the lead chemist, explaining why there is liquid water on the outside of the can but no liquid nitrogen. Use evidence from your investigation in your explanation.
Answer:
Due to warm temperature.
Explanation:
There is water present in liquid form instead of liquid nitrogen on the outer side of the can because of the temperature present in the surrounding environment. The temperature around the can is little warm which is favourable for the water but not for the liquid nitrogen. The liquid nitrogen present in liquid state when the temperature of the surrounding is too cold. if it is warm, the liquid nitrogen starts boiling and converts into gaseous state so that's why the warmer temperature is responsible for the presence of water not the liquid nitrogen.
An organism that can make its own food may be classified into one of several kingdoms, depending on other characteristics. Based on this information, in which of the following kingdoms would this organism NOT be classified?
Archaea
Fungi
Plant
Protista
Help me!!!!!
The would not be classified into archaea.
So, A.
what do a bald eagle, a komodo dragon, and a lizard have in common
Answer:
All of them derive from a common ancestor. They each share something in their DNA that ties into their past selves, which were more closely related. As they evolved, they became more and more distant, but we can still trace them back to the olden days.
Also they all have scales.
Hope this was at least semi-useful.
How many atoms of hydrogen are there in one molecule of water. if the chemical formula is H202 ?
a. 0
b. 1
c. 2
d. 3
The atomic number of a made up element is 413. What else would you know about the element with this information?
2 uniones iónicas y 2 covalentes, realizando las estructuras de Lewis correspondiente y averiguar la función del compuesto armado en la vida cotidiana.
Answer:
Cloruro de sodio y fluoruro de sodio.
Dióxido de carbono y monóxido de hidrógeno.
Explicación:
El cloruro de sodio y el fluoruro de sodio son los compuestos que tienen enlaces iónicos. Estos compuestos iónicos se utilizan para diferentes actividades de nuestra vida diaria. El cloruro de sodio se usa para cocinar y el fluoruro de sodio se usa en la pasta de dientes para limpiar nuestros dientes. El dióxido de carbono y el monóxido de hidrógeno son compuestos que tienen enlaces covalentes. El dióxido de carbono se usa en refrescos / refrescos y algunos otros líquidos que se pueden usar en la vida diaria. El monóxido de hidrógeno es el agua pura que bebemos todos los días en nuestra vida diaria y es muy importante para nuestra supervivencia.
A gas has a volume of 5.00 L at 20 degrees Celsius. What is the volume of gas at 150 degrees Celsius.
Answer:
7.22 L
Explanation:
From the question,
Applying Charles law,
V₁/T₁ = V₂/T₂...................... Equation 1
Where V₁ = Initial volume of gas, V₂ = Final volume of gas, T₁ = Initial Temperature of gas in Kelvin, T₂ = Final Temperature of gas in Kelvin
Make V₂ the subject of the equation
V₂ = (V₁×T₂)/T₁................. Equation 2
Given: V₁ = 5.00 L, T₁ = 20 °C = (20+273) K = 293 K, T₂ = 150 °C = (150+273) K = 423 K
Substitute these value into equation 2
V₂ = (5.00×423)/293
V₂ = 7.22 L
What is the formation of gas is an example of?
Answer:
The formation of a gas is a clue to chemical changes. The bubbles of gas that you observed form when an antacid is dropped into water is an example of change. ... As wood burns, it turns into a pile of ashes and gases that rise into air.
Explanation:
How much heat is required to raise the temperature of 18 grams of liquid water by 25 C?
Since the molecular weight of water is about 18 g/mol, you have about 1 mol of water. So, now we know that it takes approximately 46.2 kJ of heat energy to warm 18.02g of water from 25C to 100C and then to vaporize it into steam. Hopefully this helped!
Explanation:
PLEASE Answer asap! What characteristics are shared by all alkali metals and alkaline earth metals?
A. They conduct electricity very well
B. They are strong and shiny
C. They form alkaline solutions when mixed with water
D. They do not react with water at all
Answer:
C
Explanation:
Mostly all of them but most likely C
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Shelton measures a temperature of a solution to be 20O degrees C and stirs 5 grams of a substance into the solution. this substance disappears and 10 minutes later the substance of the solution is 80O degrees C.
based on his observation, can Shelton conclude a chemical reaction has occurred?
A) yes because the substance dissolved in the solution
B) no because the volume of the solution did not change
C) no because there are no color changing solution
D) yes because heat was produced
Answer:
did u ever get an answer??
Explanation:
Answer:
The answer is C. Yes, because heat was produced
Question 1:
How many atoms are in 25.00 g of Li.
A. 2.393 x 10^24 atoms of Li
B. 1.333 x 10^23 atoms of Li
C. 2.16 x 10^26 atoms of Li
D. 2.17 x 10^24 atoms of Li
Question 2:
How many grams is 2.393 x 10^24 atoms of CI
A. 70.45 g CI
B. 140.9 g CI
C. 140.9 mole CI
D. 70.45 mole CI
Please try to answer both questions! Thanks for all the effort :)
Answer:
1.a
2.c
hope helps
Explanation:
mark
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A student performs an acid-base titration experiment to determine the amount of ascorbic acid in different brands of juice. Which solution should the student use as the base solution in this acid-base titration experiment?
A.) HCl
B.) NaOH
C.) LiBr
D.)CaCl2
Answer:
idn Mann nnnnnnnn . .....mmmmm mmmm aaaaaaa it's a
The answer is Option B, NaOH is the solution student should use as the base solution in this acid-base titration experiment to determine the amount of ascorbic acid in different brands of juice.
What is an Acid Base Titration ?
An acid–base titration is a method of quantitative analysis.
It is used for determining the concentration of an acid or base by neutralizing it with a standard solution of base or acid of known concentration.
An indicator is used to monitor the progress of the acid–base reaction.
Ascorbic acid, HC₆H₇O₆ is an acid. So can be titrated with a base , sodium hydroxide, NaOH using the indicator, phenolphthalein.
HC₆H₇O₆(aq) + NaOH(aq) → NaHC₆H₇O₆(aq) + H₂O(l)
Among the options , HCl is an acid , LiBr , CaCl₂ are salts , NaOH is the only base.
Phenolphthalein changes from colorless to pink (or red) when all of the acid gets neutralized.
Therefore NaOH is the solution student should use as the base solution in this acid-base titration experiment to determine the amount of ascorbic acid in different brands of juice.
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Question 4
1 pts
24) Which statement best describes what happens to the particles in ice as it melts?
A) They lock into place.
B) They move more rapidly.
C) They lose some of their mars.
D) They become electrically charged.
7.(05.02 MC)
The speed of light in four different materials is shown below:
Material Speed of light in thousand miles per second
A
140
B
78
С
186
D
12
Which material is the most dense? (4 points)
Material A
Material B
Material C
Material D
Answer:
C
Explanation:
thats the answer!! HEHEHHEHHHHSJSKSSSSJS
Answer: B or A
Explanation: Everyone is saying C and i just took the test and it is not C
What does the reaction rate measure?
O A. The collisions per second
O B. The speed of the reaction
C. The reaction activation energy
O D. The moles per liter of product
Answer:
The speed of the reaction
Explanation:
I just took the test and got it right... i hope this helps u :)
What is the mass in grams of 9.02x10^28 atoms of Fe
Answer:
83.674 grams of Fe
Explanation:
9.02 x 10²⁸ atoms
To convert from atoms to grams, we first need to convert atoms to moles. To do this, divide the atoms by Avogadro's Number, 6.02 x 10²³
9.02 x 10²⁸ ÷ 6.02 x 10²³
= 1.498 moles of Fe
Now we need to convert moles to grams. To do this, multiply the moles by the molar mass of Fe. The molar mass can be found on the periodic table.
1.498 • 55.845
= 83.674 grams of Fe
Hope this helps!
3. An unknown solution has a pH of 10. Based on the pH scale, the solution can be described as
Explanation:
For example, pH 10 is ten times more alkaline than pH 9 and 100 times (10 times 10) more alkaline than pH 8. Pure water is neutral. But when chemicals are mixed with water, the mixture can become either acidic or basic.
please help
whats the skeleton equation
for this equation
copper sulfate + sodium hydroxide --> copper hydroxide
Answer:
Copper(II) sulphate – sodium hydroxide reaction
The reaction between copper(Il) sulphate and sodium hydroxide solutions is a good place to start. If you slowly add one to the other while stirring, you will get a precipitate of copper(II) hydroxide, Cu(OH)2.
how does a drought (lack of water) affect an ecosystem?
When a drought occurs, their food supply can shrink and their habitat can be damaged. Lack of food and drinking water for wild animals. Increase in disease in wild animals, because of reduced food and water supplies. Migration of wildlife.
Please help me it's urgent!!!!!
How many particles are in a 151 g sample of Li2O?
Answer:
3.052 × 10^24 particles
Explanation:
To get the number of particles (nA) in a substance, we multiply the number of moles of the substance by Avogadro's number (6.02 × 10^23)
The mass of Li2O given in this question is as follows: 151grams.
To convert this mass value to moles, we use;
moles = mass/molar mass
Molar mass of Li2O = 6.9(2) + 16
= 13.8 + 16
= 29.8g/mol
Mole = 151/29.8g
mole = 5.07moles
number of particles (nA) of Li2O = 5.07 × 6.02 × 10^23
= 30.52 × 10^23
= 3.052 × 10^24 particles.
How do you know if a material is an elernent or a compound?
Explanation:
Elements and compounds are both examples of pure substances. A substance that cannot be broken down into chemically simpler components is an element. ... A substance that can be broken down into chemically simpler components (because it has more than oneelement) is a compound.