Answer: the slope of the calibration curve is - 0.0295
Explanation:
as things are not under standard conditions that is; 1M of each reactants at T = 25°C and P = 1 atm; therefore we will use the Nernst Equation.
E = a × pNi + b
a is the slope
pNi = -log [Ni²⁺] = log 1/[Ni²⁺]
therefore the Half reaction;
Ni²⁺ (aq) + 2e⁻ = Ni (s)
here; E = E₀ + RT/zF ln[Ni²⁺]
we know that;
gas constant R = (8.31 J/mol-K)
absolute temperature T =25°C = 298 K
number of moles of electrons transferred by the cell's reaction z = 2
F is Faraday constant, = 9.64853399(24)×10⁴ C mol−1
E₀ = b
RT/zF ln[Ni²⁺] = alog 1/[Ni²⁺]
Logx = Ln x / Ln 10 = Ln (x/2.3)
so
a = (RT/zF ln[Ni²⁺])/log 1/[Ni²⁺]
= (RT/zF ln[Ni²⁺]) / ((ln 1/[Ni²⁺]) / 2.3)
= (2.3RT/zF ln[Ni²⁺]) / (ln 1/[Ni²⁺])
= (2.3RT/zF ln[Ni²⁺]) / (-ln [Ni²⁺])
= -2.3RT/zF
so we substitute
= (-2.3 × 8.31 ×298 ) / (2 × 9.64853399(24) × 10⁴)
= - 0.0295
therefore the slope of the calibration curve is - 0.0295
H= aC+ b what does this mean?
Answer:
I think it's Hydrogen is equal to aCalcuim plus b
ancient hunters used obsidian rock to make spears. given this information, what can you conclude about the minerals in obsidian rock? explain your reasoning.
it must have been light, so it can be more mobile, and strong to penetrate skin and flesh, and easy to carve so they can put it on a spear.
your welcome and a brainliest would be nice if you can
Calculate the mass of water produced when 1.36 g of butane reacts with excess oxygen.
Answer:
Mass of water produced= 1.8 g
Explanation:
Given data:
Mass of water produced = ?
Mass of butane = 1.36 g
Mass of oxygen = excess
Solution:
Chemical equation:
2C₄H₁₀ +13 O₂ → 8CO₂ + 10H₂O
Number of moles of butane:
Number of moles = mass/molar mass
Number of moles = 1.36 g/ 58.12 g/mol
Number of moles = 0.02 mol
Now we will compare the moles of butane with water.
C₄H₁₀ : H₂O
2 : 10
0.02 : 10/2×0.02 = 0.1 mol
Mass of water produced:
Mass = molar mass × molar mass
Mass = 0.1 mol × 18 g/mol
Mass = 1.8 g
Na₂S
Naming ionic compound
Answer:
Sodium Sulfide
Explanation:
I looked it up
A model of an atom which contains 24 electrons, 25 protons and 26 neutrons has some of its particles inside a nucleus at the centre of the model. What is the nucleon number (mass number) of the atom?
Answer:
The nucleon number of given atom = 51
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
The mass number is also called nucleon number.
The nucleon number of given atom = number of protons + number of neutrons
The nucleon number of given atom = 25 + 26
The nucleon number of given atom = 51
alison measured the temperature of benzene as 26.1K if the correct value is 24.9K what is the percent error
Answer:
Percent error = 4.8%
Explanation:
Given data:
Measured value = 26.1 K
Actual value = 24.9 K
percent error = ?
Solution:
Formula:
Percent error = [ measured value - actual value/ actual value] × 100
Percent error = [26.1 K - 24.9 K/24.9 K] × 100
Percent error = [ 1.2K /24.9K]× 100
Percent error = 0.048 × 100
Percent error = 4.8%
How much ice could be melted at 0°C if 5200 joules of heat were added?
Answer:
0.02kg
Explanation:
Given parameters:
Amount of heat = 5200J
Unknown:
Mass of ice that would be melted at 0°C = ?
Solution:
To solve this problem, use the expression below;
H = mL
H is the heat
m is the mass
L is the latent heat of fusion of ice = 3.33 x 10⁵ J/kg.
Insert the parameters and solve for m;
5200 = m x 3.3 x 10⁵
m = [tex]\frac{5200}{3.33 x 10^{5} }[/tex] = 0.02kg
By titration, it is found that 47.5 mL of 0.146 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
Answer:
The correct answer is 0.277 M HCl
Explanation:
NaOH is a strong base and HCl is a strong acid. NaOH reacts with HCl to form a salt (NaCl) and water via a neutralization reaction, as follows:
NaOH + HCl → NaCl + H₂O
At the equivalence point, the moles of NaOH added is equal to the moles of HCl present in the solution to be titrated. Moreover, the moles can be calculated as the product of the concentration of base or acid (Cb or Ca) and the volume (Vb and Va), as follows:
moles NaOH = moles HCl
Cb x Vb = Ca x Va
Thus, we calculate the concentration of HCl (Ca), as follows:
Ca = (Cb x Vb)/Va = (0.146 M x 47.5 mL)/(25.0 mL)= 0.277 M
if i have 2.4 moles of gas held at a temperature of 97 c and in a container with a volume of 45 L , what is the pressure of the gas
Answer:
1.62 L
Explanation:
T= 97+273.15= 370.15
R= 0.08206 atm/mol⋅K
V= 45 L
n= 2.4 mol
P= (n⋅R⋅T)/V
= (2.4 x 0.08206 x 370.15)/(45) = 1.61997 = 1.62
The pressure of the gas is 1.62 atm. This can be calculated by using ideal gas law that gives direct relation between P,V and T
Ideal gas Law:This law states that pressure and volume are directly proportional to the temperature of the gas.
What information do we have?
T= 97+273.15= 370.15 K
R= 0.08206 atm/mol⋅K
V= 45 L
n= 2.4 mol
To find:
P=?
Ideal gas law is given by:
PV=n.R.T
P= (n⋅R⋅T)/V
P= (2.4 x 0.08206 x 370.15)/(45)
P= 1.61997
P= 1.62 atm
Thus, the pressure of the gas is 1.62 atm.
Find more information about Ideal gas law here:
brainly.com/question/12873752
If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom in each case, is the molecule polar, nonpolar, or does it depend on the identity of the outer atom?
Answer:
It depends on the identity of the outer atom
Explanation:
We must recall that the polarity of a molecule depends on difference In electronegativity between atoms as well as the shape of the molecule.
When a central atom has no lone pairs and all the groups in the molecule are bonding, the identity and arrangement of the outer atoms will determine the polarity of the molecule.
A polar molecule is formed by certain types of outer atoms arranged in certain ways around the periodic table and vice versa.
The identification of the outer atom determines whether the molecule is polar or non-polar. The CH4 compound, for illustration, is a non-polar compound.
There really is no dipole present here because the net dipole moments cancel one another out. As a result, the dipole moment is negligible.
The molecule CH3Cl, for instance, is a polar molecule. There is indeed a dipole force here, and the net polarization isn't zero.
As a result, it exhibits a dipole moment. As a result, the identification of the exterior atom determines whether the molecule is polar or non-polar.
Learn more:
https://brainly.com/question/15988737?referrer=searchResults
Small or even large mountainous areas that have had long droughts or who have had many wildfires are prone to mudslides because many plants are destroyed during those processes. Mudslides are when large amounts of water accumulate rapidly in the soil in mountainous areas. The soil becomes over saturated with water and gravity causes the water-soaked soil to “run down” the mountain in a river like behavior. Without plants and their root systems to hold the soil in place, the soil gets washed away during rail storms. Which natural process causes these mudslides and washes away the soil?
How does the reactivity down group 1 and 7 differ and how is this related to the
atomic radius of these elements?
Answer:
Explanation:
Group 1 elements have a single electron (called the valence electron) in there outermost shell. Reactivity of group 1 elements (alkali metals) increases down a group; this is because as one moves down the group, the atomic radius increases thus causing the outermost electron/valence electron to be found further away from the nucleus, which makes it (the electron) to be easily lost due to weaker force of attraction between the single valence electron and the central nucleus.
However, in the case of group 7/halogen elements, as one moves down the group, the atomic radius also increases, but the reactivity reduces. This is because as one moves down the group and the atomic radius increases, the nucleus ability to attract an electron lowers, because of the increased number of electrons that shields against the pull of the nucleus (this is referred to as nuclear shielding). This is the reason fluorine is the most reactive halogen.
Is N2 a compound or an element
Answer:
Element.
General Formulas and Concepts:
Chemistry
Reading a Periodic TableDiatomic ElementsExplanation:
Diatomic Elements are elements that are bonded to themselves. Naturally, these elements are not found alone in nature.
Diatomic Elements:
Hydrogen
Nitrogen
Oxygen
Fluorine
Chlorine
Bromine
Iodine
Since Nitrogen is a diatomic element, we would find Nitrogen in nature as N₂.
Enter the balanced net ionic equation for the potentially unbalanced equation NH4Cl(aq)+NaOH(aq)→H2O(l)+NH3(g)+NaCl(aq).
Answer:
NH₄⁺ (aq) + OH⁻ (aq) → H₂O (l) + NH₃ (g)
General Formulas and Concepts:
Chemistry - Solutions
Solubility RulesReaction PredictionCompound statesExplanation:
Step 1: RxN
NH₄Cl (aq) + NaOH (aq) → H₂O (l) + NH₃ (g) + NaCl (aq)
Step 2: Balance RxN
NH₄Cl (aq) + NaOH (aq) → H₂O (l) + NH₃ (g) + NaCl (aq)
1 N on each side5 H on each side1 Cl on each side1 Na on each side1 O on each sideAlready balancedStep 3: Ionic Equations
Total Ionic Equation
Break up aqueous solutions.
NH₄⁺ (aq) + Cl⁻ (aq) + Na⁺ (aq) + OH⁻ (aq) → H₂O (l) + NH₃ (g) + Na⁺ (aq) + Cl⁻ (aq)
Net Ionic Equation
Cancel out spectator ions.
NH₄⁺ (aq) + OH⁻ (aq) → H₂O (l) + NH₃ (g)
The combustion of ethane (C2H6) produces carbon dioxide and steam.
2C,H, (g) + 702(g) — 4CO2(g) + 6H2O(g)
How many moles of Co, are produced when 5.55 mol of ethane is burned in an excess of oxygen?
moles of CO2:
Answer:
Number of moles of CO₂ produced = 11.1 mol
Explanation:
Given data:
Mass of ethane = 5.55 mol
Number of moles of CO₂ produced = ?
Solution:
Chemical equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O
Now we will compare the moles of ethane and carbondioxide.
C₂H₆ : CO₂
2 : 4
5.55 : 4/2×5.55 = 11.1 moles
Number of moles of CO₂ produced = 11.1 mol
What is the balanced chemical equation for the reaction of solid calcium metal and aqueous aluminum nitrate?
Answer:
3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)
Explanation:
Let's consider the single displacement reaction between solid calcium metal and aqueous aluminum nitrate. The unbalanced chemical equation is:
Ca(s) + Al(NO₃)₃(aq) ⇒ Ca(NO₃)₂(aq) + Al(s)
We have 3 nitrates on the left and 2 nitrates on the right, so we will multiply Al(NO₃)₃(aq) and Ca(NO₃)₂(aq) by 2 and 3, respectively, to balance them.
Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + Al(s)
Finally, we have to add coefficients before Ca(s) and Al(s) to balance the equation.
3 Ca(s) + 2 Al(NO₃)₃(aq) ⇒ 3 Ca(NO₃)₂(aq) + 2 Al(s)
Which describes an effect that ocean currents have on short term climete change
Answer:
ocean
Explanation:
Select the sentences in the paragraph that explain only the dark lines that are produced in the absorption spectra. Select all that apply.
A light is shown through a cold, dilute gas. Over time, excited atoms revert to their original lower energy state. Photons emitted travel in different directions that the original photon. Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons. Dark lines in an absorption spectrum of light can be seen when the gas lies between the light source and observer.
Answer:
Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons.
Explanation:
When electrons in atoms absorb energy, they move from a lower energy level to a higher energy level. With time, they revert to the their original energy state emitting a photon of light of appropriate wavelength.
The absorbed photons do not show up in the spectrum. They appear as dark lines in the spectrum. Hence, the absorption spectrum is the exact inverse of the emission spectrum. The dark lines in the spectrum indicates that the colors that ought to occupied those points there have been absorbed.
What are some properties that can be used to describe a solid, liquid and gas?
Answer:
Solids have a defined shape and volume.
Liquids have a definite volume but can take the shape of a container.
Gas has no definite volume or shape.
Answer:
See Explanation for more details...
Explanation:
Solid: defined form, minimal potential energy, it is not compressible, defined mass.
Liquid: No defined form, has more potential energy than the solids, it is not compressible, defined mass.
Gas: No defined form, high potential energy, it is compressible, defined mass.
9. How many protons, neutrons, and electrons does 35C1l- have?
O 17 protons, 16 electrons, 18 neutrons
O 16 protons, 17 electrons, 18 neutrons
017 protons, 18 electrons, 18 neutrons
O 17 protons, 17 electrons, 18 neutrons
A balloon contains 3300 mL of helium gas at 63 °C. What is the final volume, in milliliters, of the gas when the temperature changes to each of the following, if pressure and amount of gas do not change? Part A 78 C Express your answer to two significant figures and include the appropriate units. UA Vi= Value Units
The final volume : 3.4 L
Further explanationCharles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
V₁=3300 ml
T₁=63 + 273=336 K
T₂=78+273=351 K
the final volume :
[tex]\tt V_2=\dfrac{V_1.T_2}{T_1}\\\\V_2=\dfrac{3300\times 351}{336}\\\\V_2=3447.3~ml\rightarrow 2~sig.~fig.\rightarrow 3.4~L[/tex]
What is the molality of a solution prepared by dissolving 150.0 g C6H12O6 in 600.0 g of H2O?
Answer:
50/36 = 25/18
Explanation:
Solution at attachment box
Molality = mole of dissolvable (this question glucose) / kg of water
Answer:
Molality = 1.38 mol/Kg
Explanation:
Given data:
Molality of solution = ?
Mass of C₆H₁₂O₆ = 150.0 g
Mass of water = 600.0 g (600 g ×1 kg/1000 g= 0.6 Kg)
Solution:
Number of moles of C₆H₁₂O₆:
Number of moles = mass/molar mass
Number of moles = 150.0 g/180.16 g/mol
Number of moles = 0.83 mol
Molality:
Molality = moles of solute / kg of solvent
Molality = 0.83 mol /0.6 Kg
Molality = 1.38 mol/Kg
A 2.70g vitamin C tablet is found to contain 0.0109 mol of
ascorbic acid (C6H806}. The molar mass of C6H806 is 176.12 g/mol. What
is the mass percent of C6H806 in the tablet?
We are given:
Mass of the tablet = 2.7 grams
Number of moles of Ascorbic acid present in the tablet = 0.0109 moles
Molar mass of Ascorbic acid = 176.12 g/mol
Mass of Ascorbic Acid present in the tablet:
Mass of a given number of moles = number of moles * molar mass
replacing the variables
Mass = 0.0109 * 176.12
Mass = 1.92 grams (approx)
Mass percent of Ascorbic acid:
Mass% = ([tex]\frac{Mass of Ascorbic Acid}{Mass of the Tablet}[/tex]) * 100
replacing the variables
Mass% = (1.92 / 2.7) * 100
Mass% = 192 / 2.7
Mass% = 71.12 %
Therefore, the tablet has 71.12% Ascorbic Acid by mass
Answer:
71.1
to 3 sig figs
Explanation:
from Khan Academy
Plz help!!!!!!!!!!!!!
Answer:
message on messenger johnpatrick , so I can give help you
Pls answer quickkk :)))
Answer:
c turns back when iodine is added result indicated a chemical reaction
Joan has four containers. The chart below shows the mass and volume of each of the containers. Two of the containers are filled with solids, one is filled with a liquid, and one is filled with a gas.
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, it should be noted that if the containers are compared with an equal average volume, the containers having solids will have larger masses than that containing liquid which will also have a larger mass than that containing gas. This is because solids have there molecules touching each other in compact manner which makes the molecule exert a certain combined force/mass. The molecules of liquid are also close to one another but are not compact like the solids and are hence exerting a lesser force/mass than solids. Gases have free molecules that are far apart and thus are usually the lightest when they occupy the same volume as liquids and solids.
Can a bearded dragons eat a Hammerhead worm
Answer:
Definetly not they would choke on it
Answer:
no please do not do that
Explanation:
The percent composition of oxygen in XeO3 is
Answer:26.771%
Percent composition by element
Element Symbol Mass Percent
Xenon Xe 73.229%
Oxygen O 26.771%
If you have 45.0g of mercury Il perchlorate, how many moles do you have?
Answer:
Approx. 0.1126 mol
Which rock type is an example of igneous glass?
1. lava
2, gabbro
PLS HURRY
3. obsidian
4. rhyolite
Answer:
obsidian
Explanation:
because it is an igneous rock which is smooth
Answer:
B) Obsidian
Explanation:
Since the igneous glass last not very long like you could say obsidian compared to normal ones.