A. Zn²⁺
Further explanationGiven
Cations of several elements
Required
The least to be reduced
Solution
If we look at the voltaic series:
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe²⁺-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Fe³⁺-Ag-Pt-Au
The electrode which is easier to reduce than the hydrogen (H2) electrode has a positive sign (E red= +) and is located to the right of the voltaic series (right of H)
The electrode which is easier to oxidize than the hydrogen (H2) electrode and is difficult to experience reduction has a negative sign (E red= -) and is located to the left of the voltaic series (left of H)
Or you can look at the standard reduction potential value of the metals in the answer options, and the most negative reduction E° value which will be difficult to reduce.
The Zn metal is located far left of the other metals in the answer choices, so it is the most difficult to reduce
calculate the number of atoms in 2.5 mol manganese. show the steps and please don’t answer if you don’t know :)
Answer:
15.1 × 10²³ atoms
Explanation:
Given data:
Number of moles of manganese = 2.5 mol
Number of atoms = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
2.5 mol × 6.022 × 10²³ atoms / 1 mol
15.1 × 10²³ atoms
6 Which of the following would provide the best evidence that air is made of matter? A Making a small hole in a tire and measuring the amount of time it takes for it to become flat B Comparing the mass and volume of an empty balloon to the mass and volume of an inflated balloon C Measuring the temperature of the air in several rooms of varying sizes D Finding the volume of the air between marbles in a jar by pouring water over them
A 1500 W hair dyer is used to dry hair for 6 minutes a day for 3 days. How much energy is used?
Answer:
Since a 1W appliance will use 1 joule of energy every second, a 1500W appliance will use 1500 joules of energy every second. Hence, it will use 90000 joules of energy per minute, 540000 joules per 6 minutes (per day), and 1620000 joules of energy across all 3 days.
TL;DR 1620000 joules of energy would be used.
Explanation:
Hope this helped!
Determine the LIMITING reactant in the following balanced equation:
2KBr + CI2 --> 2KCI+ Br2, when 4g of KBr react with 6 g of CI . MM(KBr)=
119 g/mol MM(CI2)=70 g/mol *
Answer:
KBr is limiting reactant.
Explanation:
Given data:
Mass of KBr =4g
Mass of Cl₂ = 6 g
Limiting reactant = ?
Solution:
Chemical equation:
2KBr + Cl₂ → 2KCl + Br₂
Number of moles of KBr:
Number of moles = mass/molar mass
Number of moles = 4 g/ 119 gmol
Number of moles = 0.03 mol
Number of moles of Cl₂:
Number of moles = mass/molar mass
Number of moles = 6 g/ 70 gmol
Number of moles = 0.09 mol
Now we will compare the moles of reactant with product.
KBr : KCl
2 : 2
0.03 : 0.03
KBr : Br₂
2 : 1
0.03 : 1/2×0.03= 0.015
Cl₂ : KCl
1 : 2
0.09 : 2/1×0.09 = 0.18
Cl₂ : Br₂
1 : 1
0.09 : 0.09
Less number of moles of product are formed by the KBr thus it will act as limiting reactant while Cl₂ is present in excess.
HELP pleaseee its due soon
Om sister
6 C
7 A
8 C
9 D
10 B
what you could get from each meal and what you would need that nutrient for
Answer:
You can get calcium from foods and it helps to build strong bones. You can also get iron from food and it helps with blood health. Vitamin C and D3 are also common and help with immune health and D3 and biotin helps with the growth of hair, nails and skin health.
Explanation:
Limiting line of bakmer series result when electron jumps from orbit: A) 3 to 2 B) infinity to 2 C) 4 to 5 D) infinity to 1
State five differences between compound and mixtures in a tabular form
Answer:
The differences between compound and mixtures in a tabular form are as follow:
Both are written differently. Plz do write by making table at once.
Hope it help you
How many grams are in 4 moles of Calcium?
Answer:
160.32 grams of Ca or 160 if rounded
Explanation:
Multiply moles of Ca by the conversion factor (molar mass of calcium) 40.08 g Ca/ 1 mol Ca, which then allows the cancelation of moles, leaving grams of Ca.
4 mol*40.08g/mol = 160.32 grams of Ca
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Answer:
[tex]\boxed {\boxed {\sf 160.32 \ g, \ 160 \ g, \ or \ 200 \ g }}[/tex]
Explanation:
To convert from grams to moles, we must use calcium's molar mass, which can be found on the Periodic Table of Elements.
Calcium (Ca) Molar Mass: 40.08 g/molNow, we can use the molar mass as a ratio or fraction.
[tex]\frac{40.08 \ g \ Ca}{1 \ mol \ Ca}[/tex]
This fraction can be multiplied by the number of moles, which is 4.
[tex]4 \ mol \ Ca * \frac{40.08 \ g \ Ca}{1 \ mol \ Ca}[/tex]
When we multiply, the moles of calcium will cancel each other out.
[tex]4* \frac{40.08 \ g \ Ca}{1}[/tex]
Since the fraction is over 1, we can just remove the denominator and write a simply multiplication equation.
[tex]4* 40.08 \ g \ Ca[/tex]
[tex]160.32 \ g \ Ca[/tex]
Depending on the teacher's instructions, the answer can be left as is or rounded.
If we round to the technically correct number of significant figures, it would be 1, because the original measurement of 4 moles has 1 sig fig. This would 200 grams, but that's a large amount to round.
We could also round to the nearest whole number. The 3 in the tenth place tells us to leave the whole number as it is. This would be 160 grams.
The answer could be 160.32 grams, 160 grams, or 200 grams, depending on rounding and significant figures.
A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
C = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
which of the following best describes a decomposition reaction?
a. two substances combine to form a single new substance
b.two substances recombine to form two new substances
c. one element takes place of another in a compound
d. a single substance breaks down
Answer:
d.
Explanation:
because its right :)
The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.
What is Decomposition Reaction ?Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.
Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.
Therefore, The statement among the following which best describes a decomposition reaction is a Single complex substance breaks down in to two or more simpler substances.Hence, Option (D) is correct.
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How do unbalanced forces cause a change in speed, direction, and position of an object?
Answer:
But its motion is not changing. This is because the forces acting on it from opposite sides are exactly the same size. An unbalanced force can change an object's motion. ... An unbalanced force acting on a moving object could make the object change direction, change speed, or stop moving.
The unbalanced forces are unequal in magnitude. They change the state of motion of the object. The pushing or pulling of an object can generate unbalanced forces and cause change in the direction, and position of an object.
What is an unbalanced force?The two forces of unequal magnitudes and they act on an object simultaneously such that the net force is not zero are defined as the unbalanced forces. The body acted upon by the unbalanced forces changes its state of motion.
The unbalanced forces are the opposite of a balanced force. An unbalanced force causes a change in motion, speed, direction, or movements. Because of unequal force or strength which is applied to one side of an object.
In the case of unbalanced forces, one side has more energy than the other. Opposite sides have forces acting against them.
Thus the unbalanced forces are out of balance and are not equal, it causes body's position to change.
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A person who is recessive for eye color is crossed with a person who is also recessive for eye color.
What is the probability of them having a child who is dominant for eye color?
0%
0%
25%
25%
50%
50%
75%
75%
100%
a compound contains 64g of O and 8g of H. what is the empirical formula for this compound
Explanation:
Moles of Oxygen = 64/16 = 4
Moles of Hydrogen = 8/1 = 8
Hence the empirical formula is H2O.
relation between atomic number and frequency of radiation
Answer:
This law established a relationship between atomic number of element and frequency of X-rays of that atom. According to this law, the square root of frequency of X-rays imparted by elements is directly proportional to the atomic number of that element.
Which elements are both classified as metalloids?
Ge and As
Bi and Po
B and C
Si and P
Question 10 of 32
Which of the following is an example of how the same chemicals used to
help people can harm the environment?
O A. Phosphates are removed from detergents so they don't end up in
drinking water.
B. Hillsides erode after plants are removed to clear a space for crops.
C. Plants grow back after toxic chemicals are removed from the
surrounding soil.
D. Excess fertilizers run off into rivers and create a dead zone.
SUBMIT
Answer:
D
Explanation:
The correct answer that gives a good example of how the same chemical used to help people can harm the environment would be when excess fertilizers run off into rivers and create a dead zone.
Fertilizers are usually applied to crops as an agricultural practice by farmers to enhance the yield of the crops and boost food or raw materials production. However, excess fertilizer gets washed into nearby water bodies and ends up creating a low-oxygen zone that is incapable of supporting lives within the water body - also known as dead zones.
The correct option is, therefore, D.
Which ion at ground state has the same electron configuration as an atom of neon at ground state?
1. Ca^2+
2. CI^-
3. Li^+
4. O^2-
Answer:
4. O^2-
Explanation:
O^2 has 16 electrons, while Ne has 18 electron. O^2- is a molecule that has one electrons added to each atom, meaning that there are two extra electrons. Which makes O^2 the same electron configuration as an atom of neon.
The ions having same electronic configuration as neon are Calcium, oxygen, and chlorine ion. Thus, options 1, 2, and 4 are correct.
The electronic configuration has been defined as the electron address in a atom. The electronic configuration has been based on the quantum rule for the filling of the electrons.
The number of electrons present in Neon has been 18. Thus, the ion with the presence of 18 electrons has same electronic configuration as Neon.
The number of electrons in the following ions are:
[tex]\rm Ca^{2+}=18\\Cl^-=18\\Li^+=4\\O_2^{-}=18[/tex]
The number of electrons of calcium ion and chlorine ion are similar to the number of electrons of Ne. Thus the ions having same electronic configuration as neon are Calcium, oxygen and chlorine ion. Thus, options 1, 2, and 4 are correct.
For more information about electronic configuration, refer to the link:
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What happens in a chemical reaction and what does it require
Answer: i need a pic of it plz
Explanation:
plx
When a neutral atom gains or loses a proton, it becomes a(n)
*
Different Element
Isotope
lon
Neutral Atom
Answer:
Ion
Explanation:
I'm pretty sure yhi
explain why the chemical formula below is “balanced”.
2Cu + 02 -> 2CuO
What type of liquid is sucrose solution? (Salt solution, weak acid, etc)
Sucrose solution is an example of sugar solution. Details about a solution can be found below.
What is a solution?A solution is a mixture, which may be liquid, gas or solid, formed by dissolving one or more substances.
A solution is formed when a solute substance dissolved in a solvent.
For example; sucrose is a solute molecule that dissolves in water to form a sucrose solution.
It is important to note that sucrose solution is hypertonic to water i.e. it is a more concentrated solution. There is a net movement of water molecules, by osmosis from the water outside to the sucrose solution.
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A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
Q = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
It is given that heat required to vaporize the one kilogram copper is 4730 Kj thus, for 2 kg
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
why cant school just be poggers for once:(
Answer:
yes the schools should be poghers for once only:)
A hydrated sample of cobalt II chloride has a molar mass of 309.99 g/mol. What is the mole ratio between cobalt II chloride and water?
Explanation:
Let there be 1 mole of CoCl2.
Mass of CoCl2 = 1mol * (129.839g/mol) = 129.839g
Mass of H2O = 309.99g - 129.839g = 180.151g
Moles of H2O = 180.151g / (18g/mol) = 10mol
Hence the mole ratio of CoCl2 to H2O is 1 : 10.
Answer:
[tex]\boxed {\boxed {\sf 1 \ mole \ CoCl_2 \ to \ 10 \ mole \ H_2O}}[/tex]
Explanation:
First, identify the formula of cobalt II chloride: CoCl₂
Next, find the molar mass of CoCl₂. Identify the individual element's mass.
Cobalt (Co): 58.93319 g/molChlorine (Cl): 35.45 g/molSince there is a subscript of 2 after the Cl, we must multiply the molar mass of chlorine by 2
CoCl₂: (58.93319 g/mol) + (2* 35.45 g/mol) = (58.93319 g/mol)+(70.9 g/mol) 129.83319 g/molAssuming the sample is 1 mole, we can subtract the mass we just found from the hydrate sample's mass. This is the mass of the water.
309.99 g - 129.83319 g= 180.15681 gNow, we need to find the number of moles of water. Begin by finding the molar mass of water: H₂O
Hydrogen (H): 1.008 g/mol Oxygen (O): 15.999 g/molSince there is a subscript of 2 after the H, we must multiply the molar mass of hydrogen by 2.
H₂O: (1.008 g/mol *2)+ 15.999 g/mol = (2.016 g/mol)+(15.999 g/mol)=18.006 g/molFinally, divide the mass of the water by the molar mass of water.
180.15681 g / 18.006 g/molNote that the grams or g will cancel.
180.15681 / 18.006 mol = 10.00537654 molThis is roughly 10, so we can round to 10.
≈ 10 mol H₂OSo, the mole ratio is 1 mole CoCl₂ to 10 mole H₂O
Paper for my last question
Please help I’m desperate giving 50 points and brainliest
Answer:
check explaination
Explanation:
Q. 4:
a) 7 ml
b) 9 ml
c) volume of rock = volume of column (with rock in it) - volume of column (without rock)
= 9-7
= 2 ml
d) density = mass ÷ volume
therefore, mass = volume × density
= 2 × 3 => 6 g
Q. 5:
1st has the highest density
this is because, density = mass ÷ volume
as volume is constant , density is directly proportional to mass
as image 1 has more number of molecules, it's mass will be maximum.
therefore, 1st image will have maximum density
At night, the demand for electricity supplied by a fission nuclear reactor decreases. How is the fission nuclear reaction controlled to avoid overproduction of electricity? The temperature of the reactor is lowered because high temperature and pressure are needed. The temperature of the reactor is raised because the reaction slows down at higher temperatures. The exposure between the fuel rods and a neutron-absorbing material is increased. The exposure between the fuel rods and a neutron-absorbing material is reduced.
Answer:
The exposure between the fuel rods and a neutron-absorbing material is increased.
Explanation:
The exposure between the fuel rods and a neutron-absorbing material is increased.
A nuclear reactor produces energy via a fission reaction. A fission reaction is a self sustaining reaction.
The nuclear fuel is bombarded with neutrons. The process produces more neutrons which continues the reaction.
In order to decrease the rate of reaction, control rods are inserted. These control rods are neutron-absorbing materials.
At night when demand for electricity decreases, the exposure between the fuel rods and a neutron-absorbing material is increased so that more neutrons are absorbed in order to decrease the rate of nuclear reaction.
Hi! Can you help me?
Is NaCI an element, compound, or mixture?
Thanks!
Answer:
Compound
Explanation:
Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions. With molar masses of 22.99 and 35.45 g/mol respectively, 100 g of NaCl contains 39.34 g Na and 60.66 g Cl
Two reindeer are winding through the winter forest . They spot three owls ,two foxes and four bear . How many legs are there in total?
Answer:
40
Explanation:
8 + 8 + 8 + 16
In order for photosynthesis to take place, energy in the form of ______ is required.
A. sound
B. light
C. electricity
D. kinetic
Answer:
B. Light
Explanation:
Light is converted into energy during photosynthesis