Answer:
Examples of metals are aluminium, copper, iron, tin, gold, lead, silver, titanium, uranium, and zinc.
Explanation: This is was makes a metal a metal: it needs to be:
high electrical and thermal conductivity as well as by malleability, ductility, and high reflectivity of light.
Please help with my Chem101 hw
hydrogen chloride(hydrogen, and chlorine
The Second Law of Thermodynamics states that:
Select one:
Answer:
In the total entropy of an isolated system, the thermal energy per unit temperature that is unavailable for doing useful work can never decrease.
Why can light be treated like a particle?
O A. Some wavelengths are visible and some are not.
B. Light comes in chunks of energy called photons.
C. Light waves can bounce off of some surfaces.
D. Light can be separated into a spectrum of colors.
A light can be treated like a particle because light comes in chunks of energy called photons.
What are photons?Photons are the small packets of energy and its energy will be represented by the following equation as:
E = hυ, where
h = plank's constant
υ = frequency
Light will be treated like a wave as well as of particle due to presence of this type of energy.
Hence correct statement is light comes in chunks of energy called photons.
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Answer:
B. Light comes in chunks of energy called photons.
Gastric acid plays a key role in the digestion of proteins by activating digestive enzymes and often has a pH value in the range of 1.5 to 3.5. If the pH of the acid at a given time is found to be 1.25, calculate the molarity of the gastric acid juice.
If the pH of the acid at a given time is found to be 1.25, then the molarity of the gastric acid juice is 0.056M.
What is pH?pH is define as the negative logarithm of the concentration of H⁺ ions present in any solution and it will be represented as:
pH = -log[H⁺]
Concentration will be present in the form of molarity and pH value for gastric acid is given 1.25 means it is strong acid as it completely dissociates into their ions.
Required equation for calculation will be:
[H⁺] = [tex]10^{-pH}[/tex]
[H⁺] = [tex]10^{-1.25}[/tex]
[H⁺] = 0.056 M
Hence molarity of the gastric acid juice is 0.056M.
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Given the reaction, how many moles of Z will be produced from 4.85 mol A, assuming excess B?
2 A +3B = 4Y + 5 Z
Answer:
12.125 moles of Z
Explanation:
Hi! Here, since you only know the number of moles for one of the reactants, you will use the coefficients in the reaction to use the mole ratio to find your answer. Since the question states that there are 4.85 mol A and excess B, A is your limiting reactant. This means that once all of the A is used up in the reaction, you will have your maximum amount of Z left behind because there will only be B left and no A to make more Z.
The mole ratio of A:Z is 2:5, found from the coefficients in the chemical equation(2 moles of A for every 5 moles of Z).
So, start with the information that is given to you (4.85 mol A) and then use the mole ratio, like this:
4.85 mol A([tex]\frac{5 mol Z}{2 mol A}[/tex])
This way, the mol A will cancel out, leaving behind mol Z (always put the unit you are looking for on top).
Doing this leads to mol Z = 12.125 mol.
I hope this helps! Good luck with your finals!
As per the given 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.
What is chemical reaction?A chemical reaction is the transformation of one or more substances, known as reactants, into one or more different substances, known as products.
Chemical reactions involve the breaking and forming of chemical bonds between atoms and molecules, causing atoms to rearrange and the chemical and physical properties of the substances involved to change.
From the balanced chemical equation, we can see that 2 moles of A react with 3 moles of B to produce 5 moles of Z.
So the mole ratio of A to Z is 2:5.
Therefore, if 2 moles of A react to produce 5 moles of Z, then 4.85 moles of A will produce:
(4.85 mol A) x (5 mol Z / 2 mol A) = 12.125 mol Z
Thus, 4.85 moles of A will produce 12.125 moles of Z, assuming excess B.
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A constant current of 0.350 A is passed through an electrolytic cell containing molten CrCl₂ for 21.7 h. What mass of Cr(s) is produced? The molar mass of chromium is 52.0 g/mol. Provide your answer rounded to 3 significant digits.
An electrochemical cell can generate or use electrical energy. The mass of solid chromium that will be deposited on the electrochemical plate is 7.17 gm.
What is current?Current in an electrochemical cell is the ratio of the quantity of electricity in columns and time in seconds.
Given,
Current (I) = 0.350 A
Time = 21.7 hours
Molar mass of chromium = 52.0 g/mol
First time is converted into seconds:
1 hour = 3600 seconds
21.7 hours = 76020 seconds
The quantity of electricity flowing in the electrochemical solution is calculated as:
[tex]\begin{aligned} \rm Q & = \rm It\\\\& = 0.350 \times 76020 \\\\& = 26607\;\rm C \end{aligned}[/tex]
Electricity required for depositing 1 mole or 52.0 g chromium is calculated as:
In electrochemical solution, chromium chloride is dissociated as:
[tex]\rm CrCl_{2} \rightarrow Cr^{2+} + 2 Cl^{-} \\\\\rm Cr^{2+} +2 e^{-} \rightarrow Cr[/tex]
Two moles of electrons are needed to deposit 52.0 g of chromium.
If, 1 electron = 96500 C
Then, 2 electron = 193000 C
The mass of chromium deposited is calculated as:
193000 C = 52 g chromium
So, 26607 C = [tex]\dfrac{26607 \times 52}{193000} = 7.17 \;\rm gm[/tex]
Therefore, 7.17 gm of chromium is produced.
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Which type of galaxy is shown
Answer:
Spriral
Explanation:
hope this helps
Convert 55 m3 to liters
Explanation:
hope it help you thanku byy.
.mark it brainlist
How would describe the characteristics of the urine
Urine has the color of pale yellow to deep amber. It is odorless and has a pH of 4.5-8.0
Which is a characteristic of an aqueous solution of HNO3?
A.
It conducts electricity.
B.
It forms OH-ions.
C.
It turns litmus blue.
D.
It turns phenolphthalein pink.
Answer:
A. it conducts electricity
Explanation:
A. Since Nitric Acid is a strong acid, which means it is a strong oxidizing agent, this makes Nitric Acid a good conductor of electricity.
B. Basic solutions are only going to form OH⁻ ions. A Nitric Acid solution will form H⁺ ions.
C. Alkaline substances (pH greater than 7) are more likely to turn blue, so HNO₃ would turn that blue into a red color.
D. I don't know much about phenolphthalein , all I know is that is is pink in Alkaline solutions (basic) and colorless in acidic solutions.
I hope this helps, good luck!
Consider the following equilibrium: HCOOH(aq) + H2O(l) ↔ HCOO-(aq) + H3O+(aq). How will the addition of a small amount of NaOH affect the equilibrium?
A. It will shift to the left.
B. It will shift to the right.
C. It won't be affected.
D. More information is needed.
The compound M3X3 has a solubility of 0.039 g/L and a molar mass, ℳ = 108.64 g/mol. Calculate the Ksp for this compound.
Report your answer to TWO significant figures. You may (but are not required to) enter your answer in scientific notation; for example, if your answer is 2.4 × 10−2, you would enter 2.4E-2. The E must be uppercase.
Let's see
[tex]\\ \rm\Rrightarrow [M_3X_3]\leftrightharpoons {[M^{3+}]\atop 3x}+{[X^{3-}]\atop 3x}[/tex]
So
As solubility and molar mass given
[tex]\\ \rm\Rrightarrow [M_3X_3]=\dfrac{Solubility}{Molar\:mass}[/tex]
[tex]\\ \rm\Rrightarrow x=\dfrac{0.039}{108.64}[/tex]
[tex]\\ \rm\Rrightarrow x=0.00034M=3.4\times 10^{-4}M[/tex]
So
[tex]\\ \rm\Rrightarrow K_{sp}=(3x)(3x)=(3x)^2=9x²[/tex]
So
[tex]\\ \rm\Rrightarrow K_{sp}=9(3.4\times 10^{-4})^2=0.0000010404=104\times 10^{-6}mol^2L^{-2}=104\mu mol^2L^{-2}[/tex]
What is an example of equilibrium?
O the release of a gas product from an open system
O the partial dissolution of salt crystals in saturated water
O the combustion of gasoline in a car engine
O the mixing of oil and water in a closed container
A good example of equilibrium would be the mixing of oil and water in a closed container.
What is chemical equilibrium?Chemical equilibrium is a condition in which the concentrations of components of a chemical reaction remain unchanged and have no tendency to change.
Of all the options, the only one where the concentrations of the component reactants cannot change is a mixture containing oil and water in a closed container.
Oil and water are immiscible and thus, their concentrations remain constant.
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Label the figure below with the names of a volcano's parts.
Answer:
Hello the answer for the volcanos is here below:
7. Pipe
8. Crater
9. Vent
10. lava flow
11. magma chamber
Hope this helps :)
Under what conditions would pressure affect the reaction rate
Answer: D) If the reaction occurs in the gas phase
Explanation:
Check that Alpha Decay and Uranium are selected. Turn on Write Equation and Show Equation. What you see is an equation that shows the original uranium atom on the left. The boxes on the right represent the daughter product- the atom produced by radioactive decay- and the emitted alpha particle.
A. The upper left number next to the daughter product is the mass number of the daughter product. What is the mass number of the daughter product ?
B. The lower left number next to the daughter product is the atomic number of the daughter product. What is the atomic number of the daughter product ?
C. According to your equation, what isotope remains after the alpha decay of uranium-238?(Hint: look up the element symbol on the periodic table and name the element then dash and then mass number from A- ex: uranium-238)
D. How does the mass number of the daughter product after alpha decay relate to the original atom?
E. How does the atomic number of the daughter product after alpha decay relate to the original atom?
(A) The mass number of the daughter product is 234.
(B) The atomic number of daughter product is 90.
(C) The isotope that remains after the alpha decay is thorium-234.
(D) The mass number of the daughter product is 4 less than the original atom.
(E) The atomic number of the daughter product is 2 less than the original atom.
Alpha decay of UraniumThe alpha decay of Uranium involves the emission of alhpa particles and thorium-234 as daughter product.
[tex]^{238}_{92}U\ ---- > \ \ ^4_2He \ + \ ^{234}_{90}Th[/tex]
From the equation of alpha decay of Uranium, we can infer the following;
The mass number of the daughter product is 234.The atomic number of daughter product is 90.The isotope that remains after the alpha decay is thorium-234.The mass number of the daughter product is 4 less than the original atom.The atomic number of the daughter product is 2 less than the original atom.Learn more about alpha decay here: https://brainly.com/question/17145324
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Which of these describes an ethical dilemma associated with prosthetics?
OA. The use of prosthetics to enable someone who has lost a bodily
function to regain that function
OB. The surgery required to maintain or replace prostheses
OC. The future use of prosthetics to enhance a body part's natural
function
D. Using a prosthetic arm that connects with nerve endings to receive
messages from the brain
Answer:
OC
Explanation:
Is the only answer which implies a dilemma.
An ethical dilemma associated with prosthetics among the following is The future use of prosthetics to enhance a body part's natural function. Hence, Option (C) is correct
What is Prosthetics ?
In medicine, a prosthesis, or a prosthetic implant, is an artificial device that replaces a missing body part, which may be lost through trauma, disease, or a condition present at birth.
Prostheses are intended to restore the normal functions of the missing body part.
Therefore, An ethical dilemma associated with prosthetics among the following is The future use of prosthetics to enhance a body part's natural function. Hence, Option (C) is correct
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HELP ASAP FOR MY SISTER SCIENCE
Answer:
B.) an elephant having the same trunk sizes and shapes as its parents
Explanation:
an inherited trait is genetically determined. inherited traits are coded in our DNA and hence can be passed on to the next generation.
Why is there an imbalance in the carbon cycle?
The heat of vaporization is 540 calories per gram. What is the minimum number of
calories needed to change 40.0 grams of water
at 100°C to steam at the same temperature and
pressure?
The minimum number of calories needed to change 40 g of water at 100°C to steam is 21600 calories
Data obtained from the question Mass of water (m) = 40 gHeat of fusion (ΔHv) = 540 cal/gHeat (Q) =?The heat needed to vaporise the water at 100 °C can be obtained as follow:
Q = m × ΔHv
Q = 40 × 540
Q = 21600 calories
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AP CHEM answer and i will give brainliest, image attached
Answer:
what is this i dont know what kind of math this is
our energy supply is running out
The statement that our energy supply is running out is false in accordance with the law of conservation of energy.
What is the law of conservation of energy?The law of conservation of energy states that the energy possessed by an object or physical body can neither be created nor destroyed, but it can only be transformed from one form of energy to another.
This ultimately implies that, we cannot run out of energy supply because the energy we generate from any source can't be destroyed in accordance with the law of conservation of energy.
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The molar solubility of CoS is 5.0 × 10-22 mol L–1 in pure water. Calculate the Ksp for CoS.
Answer:
2.5 X 10^-43
Explanation:
CoS> Co + S
Co=X
S=X
X= 5.0 X 10^-22
Ksp= [X][X]
Ksp= [5.0 X 10^-22][5.0 X 10^-22]
Ksp= 2.5 X 10^-43
The Ksp for CoS is calculated as 2.5 × 10⁻⁶³ (mol/L)². This value represents the equilibrium constant for the dissociation of CoS in water and indicates the extent of its solubility in the solution.
The molar solubility of CoS is given as 5.0 × 10⁻²² mol/L. In the chemical equation for the dissolution of CoS in water, it dissociates into Co⁻²⁺ and S²⁻ ions.
The solubility product constant (Ksp) expression for CoS is written as:
Ksp = [Co²⁺] * [S²⁻]
Since CoS dissolves completely to form one Co²⁺ ion and one S²⁻ ion, we substitute the molar solubility values into the Ksp expression:
Ksp = (5.0 × 10⁻²² mol/L) * (5.0 × 10⁻²² mol/L)
Ksp = 2.5 × 10⁻⁴³ (mol/L)²
Therefore, the Ksp for CoS is calculated as 2.5 × 10⁻⁶³ (mol/L)². CoS has an extremely low solubility in water, resulting in an exceptionally small Ksp value.
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What’s the answer???????#15
Answer:
C.They are only magnetic if an electric current is running through them
Explanation:
Electromagnets are conductors which develop a magnetic field due to the electrons flowing through them. If the flow of electric current stops, the motion of the electrons stop and they do not generate their magnetic fields.
What is the molar concentration (molarity, M) of a 450 mL solution that contains 2.00 mol of FeCl₂?
Answer:
3.50 Mol/L or M
Explanation:
450 mL / 1000 = 0.45 L
1 mole ------- 126.751 g
? mole ------- 200 g
moles = 200 * 1 / 126.751
moles = 200 / 126.751
= 1.57789 moles FeCl₂
M = n / V
M = 1.57789 / 0.45
= 3.50 Mol/L or M
As the chain length of a hydrocarbon is increased the heat of vapourization
increases because
Select one:
O a. the molecules have greater weight
O b. there are more hydrogens available for hydrogen bonding
c. the number of dipole-dipole interactions increases
O d. the strength of the London forces increases with molecular size
the carbon-carbon bonds become more polar
Answer:
Answer is d, strength of London forces increases with molecular size.
Explanation:
Dispersion forces are the forces preesnt between all intermingling atoms, molecules and particles. Dispersion forces are the weakest intermolecular force, but they build up with the addition of more atoms, molecules or particles. Heat of vapourisation or boiling point is dependant on the energy required to break the bonds within the molecule/hydrocarbon in question. The build up of dispersion forces create greater intermolecular forces, which make the boiling of a substance more difficult. Hence increased hydrocarbon chain length, and the related increased eat of vapourisation is due to how the strength of the London/Dispersion forces increases with molecular size
Question 2 of 30
A pamphlet about a fuel that contains up to 15% ethanol claims that the fuel
produces less of some types of pollution. The amount of ethanol in the fuel
and the pollutants are regulated by the government. What can you not infer
from this information?
Answer:
the awnser is d the other fuel produce more pollutants
Explanation:
because right out the bat we know that other fuels produce more than a 15 percent fuel so the right awnser is d
Why are metals so ductile?
Answer:
throughout the metallic structure allowing the atoms to slide past each other. This sliding is why metals are ductile and malleable. Ionic compound must break bonds to slide past one another, which causes the ionic material to split and crack.
Explanation:
Hope this helps loves mark me brianlest x
need help please :'((((((((((
Answer:
you work out the moles by finding the grand formula mass them you divide the actual mass by the grand formula mass: 25/160 (my grand formula mass is probably slightly different from yours) which I got 0.15625 then I times it by 32(O2) and I got 5. but my periodic table is different. it's whole numbers. ;-)
Explanation:
4.44
Matter is made of atoms that have positive centers of neutrons and protons
surrounded by a cloud of negatively charged electrons.
This statement is...