The oxidation state of the lead and chromium metal in the PbCrO₄ compound is +2 and +6 respectively.
What is oxidation state?Oxidation state of any atom tells about the number of exchangeable electrons from the outermost shell of that atom.
As we know that in the compound PbCrO₄, CrO₄ is an anion and charge on this is -2 i.e. it is represented as CrO₄²⁻. We know that oxidation state of each oxygen atom is -2 and let us assume the oxidation state of chromium is y, so we calculate the value of y for CrO₄²⁻ as:
y + 4(-2) = -2
y = -2 + 8 = 6
Let the oxidation state of lead is x and calculation for that from PbCrO₄ will be done as:
x + 6 + 4(-2) = 0
x = 8 - 6 = 2
Oxidation state of Pb is +2 and of Cr is +6.
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Which of these is the best argument for switching from combustion-powered cars to fuel cell cars in order to help the environment?
They use hydrogen, which produces water vapor instead of CO2.
They conserve gasoline reserves so they can be burned in the future.
They decrease the money spent by consumers on transportation.
They decrease the reliance on other countries for non-renewable resources.
Answer:
A
Explanation: Taking it now
A balloon is filled with 3.8 l of helium gas at stp. approximately how many moles of helium are contained in the balloon? 72 mol 0.17 mol 85 mol 0.26 mol
When 25.0 g of ch4 reacts completely with excess chlorine yielding 45.0 g of ch3cl, what is the percentage yield, according to ch4(g) + cl2(g) → ch3cl(g) + hcl(g)?
Percentage yield = (actual yield / theoretical
yield) x 100%
The balanced equation for the reaction is,
CH₄(g) + Cl₂(g) → CH₃Cl(g)
+ HCl(g)
Since there is excess of Cl₂ gas, we can assume that all of CH₄ gas are reacted.
Moles of CH₄(g) = mass / molar mass
= 25.0 g / 16 g/mol
= 1.5625 mol
The stoichiometric ratio between CH₄(g) and CH₃Cl(g)
is 1 : 1
Hence moles of CH₃Cl(g) = 1.5625 mol
Molar mass of CH₃Cl(g) = 50.5 g/mol
Mass of CH₃Cl(g) = number of moles x molar mass
= 1.5625 mol x 50.5 g/mol
= 78.9 g
Hence theoretical yield = 78.9 g
Actual yield = 45.0 g
Hence,
Percentage yield = (45.0 g / 78.9 g) x 100%
= 57.03%
in an experiment , the hypothesis is if the wave length of light shining on a plant is shortened , the rate of photosynthesis is slowed down , if this experiment is preformed
A. the rate of photosynthesis will increase
B. the plant will die
C. the rate of photosynthesis will slow down
D. the result can be determined
Which of the following best expresses the definition of a closed system? Energy can enter or leave the system but matter cannot. Heat and matter are both able to enter or leave the system. Matter can enter or leave the system but energy cannot. Heat and matter can enter the system but cannot leave the system.
What concentration of so32– is in equilibrium with ag2so3(s) and 9.50 × 10-3 m ag ? the ksp of ag2so3 can be found here?
What is the molality of a solution of water and kcl if the freezing point of the solution is –3mc030-1.jpgc?
How would agglutination reactions be used to locate the source of an epidemic?
Agglutination reactions are used to locate the source of an epidemic because it is highly sensitive and may be used to detect the existence of antibody or antigen in a patient’s serum. Agglutination reactions are commonly used in the medical clinic. It can be used to identify the blood cells type for transfusion and to know the cultures of bacteria. It has been widely used to know if a patient had a bacterial infection.
Answer:
The agglutination reactions clinically exhibit a broad spectrum of applications. They facilitate in finding the existence of antibodies or antigens in the sample. The agglutination reactions can be used to find the epidemic source. This can be achieved by testing the blood sample of the patient.
If the antibodies found in the sample of blood possess the tendency of undergoing agglutination with the disease-causing antigens, then it can be considered that the person has got encountered with the disease. In case of an epidemic, the samples of blood from the group of individuals is taken and examined for the agglutination reaction. Thus, the reaction can be used to find the source of the epidemic.
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How many moles of LiCl
are in 250g of LiCl
The primary product of the combustion of sulfur is:
For the following nuclear reaction, what was the beginning radionuclide (X)? X → 86Rn222 + 2He4
Which is a negative result of eating too many lipids?
A-Fatty acids become deficient in the body.
B-Dangerous fat-soluble vitamins are carried to cells.
C-Fat deposits put a strain on the body.
D-The body produces too many membrane structures.
Final answer:
Eating too many lipids can lead to fat deposits that strain the body, unhealthy weight gain, increased risk of cardiovascular disease, and potentially hypervitaminosis due to excess accumulation of fat-soluble vitamins when consumed in large quantities.(Option C)
Explanation:
A negative result of eating too many lipids, specifically saturated fatty acids, trans fats, and cholesterol, is that fat deposits can put a strain on the body. Excessive intake of lipids can lead to an unhealthy weight gain and a rise in blood lipid levels, which in turn may increase the risk of health problems such as cardiovascular disease.
Conditions like atherosclerosis, where cholesterol contributes to the narrowing of arteries, can manifest as a result of high cholesterol levels. Moreover, while fat-soluble vitamins A, D, E, and K are absorbed with the help of dietary fats, an overabundance due to excessive lipid intake can lead to hypervitaminosis, a state where excess vitamins are stored in the body's fat.
The density of h2 gas in a rigid container is 0.135 g/l at a given temperature. what is the pressure of hydrogen in the flask if it is heated to 201 °c?
The pressure of hydrogen in a flask heated to 201 °C is calculated using the ideal gas law with the provided density to find the number of moles, converting the temperature to Kelvin, and solving for pressure while assuming constant volume and amount of gas.
Explanation:To determine the pressure of hydrogen in a flask when heated to 201 °C, we can use the ideal gas law, PV = nRT, where P is pressure, V is volume, n is number of moles, R is the ideal gas constant, and T is temperature in Kelvin. First, calculate the number of moles of hydrogen gas using its density and the molar mass of hydrogen. The molar mass of H2 is approximately 2 g/mol, so 0.135 g in a liter would mean 0.135 g / 2 g/mol = 0.0675 mol. Convert the temperature from degrees Celsius to Kelvin by adding 273.15 (201 °C + 273.15 = 474.15 K).
Assuming the flask's volume and amount of gas remain constant and recalling R is approximately 0.0821 L·atm/(mol·K), the pressure can then be calculated using the rearranged ideal gas law P = (nRT)/V. Inserting the calculated number of moles, the given volume of 1 liter, and the temperature in Kelvin, you can solve for pressure, P.
Which pH range is basic?
A. 0.00 to 2.00
B. 3.00 to 5.00
C. 6.00 to 8.00
D. 9.00 to 11.00
Would be glad if you helped me!
Aluminum has a density of 2.70 g/mL. Calculate the mass (in grams) of a piece of aluminum having a volume of 264 mL .
The mass of a piece of aluminum with a volume of 264 mL and a density of 2.70 g/mL is calculated to be 712.8 grams.
Explanation:To calculate the mass of a piece of aluminum with a volume of 264 mL when the density of aluminum is 2.70 g/mL, use the formula:
mass = density × volume
Here, the density (ρ) is given as 2.70 g/mL, and the volume (V) is 264 mL. Plugging these values into the formula gives us:
mass = 2.70 g/mL × 264 mL
When you do the calculation, the result is:
mass = 712.8 grams
Therefore, the mass of the piece of aluminum is 712.8 grams.
The mass of the piece of aluminum is 712.8 grams.
The density (p) is defined as mass (m) divided by volume (V). The formula is:
p = m / V
Given:
Density of aluminum, p = 2.70 g/mL
Volume of aluminum, V = 264 mL
To find the mass (m), rearrange the formula to solve for m:
m = p . V
Now, substitute the given values into the equation:
m = 2.70 g/mL × 264 mL
m = 712.8 g
Which of the following is true? A. Lithium is the least reactive element in group 1, because it is the smallest and holds its valence electron more tightly than the others in the same group. B. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group. C. Group 1 elements are more reactive than the group 2 elements because they have more valence electrons to lose. D. The least reactive element in group 2 is the one with the largest atomic radium and the least amount of attraction between the nucleus
Can someone please describe the method for titration to me please :)
A student mixes 100 ml of 0.50 m naoh with 100 ml of 0.50 m hcl in a styrofoam® cup and observes a temperature increase of at,. when she repeats thisexperiment using 200mlof each solution, she observes a temperature change of at2. if no heatis losttothesurroundings or absorbed by the styrofoam cup, what is the relationship betweenat, and at2?
Answer:
The relationship between initial temperature and final temperature is 2.
Explanation:
The reaction of:
HCl + NaOH → H₂O + NaCl + ΔH
Produce heat (ΔH). This heat is evidenced in the increasing of temperature in the system.
If you add 100 mL of 0,50M of both NaOH and HCl you will produce heat, that increase the temperature of the system in X°C.
Now, the addition of 200mL of 0,50M of both NaOH and HCl will produce twice the initial heat increasing the temperature of the system in 2X°C.
That means the relationship between initial temperature and final temperature is 2.
I hope it helps!
the pressure of a refrigerant cylinder containing saturated refrigerant is determined by what
The pressure of a refrigerant cylinder containing saturated refrigerant is primarily determined by the temperature and the density of the refrigerant, according to the Clausius-Clapeyron equation. Other factors include the vaporization-condensation equilibrium and the sum of hydrostatic and atmospheric pressures.
Explanation:The pressure of a refrigerant cylinder containing saturated refrigerant is determined by several factors, but primarily by the temperature and the density of the refrigerant. This is according to the Clausius-Clapeyron equation, which describes the relationship between a substance's vapor pressure and its temperature.
In scenarios involving supercritical fluids, such as a sample of water in a sealed container at a specific temperature, the pressure is determined by the vaporization-condensation equilibrium. This leaves us with a mixture of liquid and vapor, and a distinct pressure determined by the dense liquid and the less dense gas.
In addition, the pressure of a gas (assuming it behaves ideally) is also influenced by the hydrostatic pressure in the cylinder plus both the pressure of the vapour (due to vapor pressure of water) and the atmospheric pressure. An example would be a gas exerting pressure in a column of mercury, where the total pressure is the sum of the hydrostatic pressure due to the column of mercury and atmospheric pressure.
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When the concentration of hydrogen ions in a solution is decreased by a factor of ten, the ph of the solution
a.increases by 1
b.increases by 10
c.decreases by 1
d.decreases by 10?
What is the minimum amount of water needed to dissolve 51g of NaNO3 at 40 degrees Celsius?
a minimum amount of [tex]\(56.67 \, \text{mL}\)[/tex] of water to dissolve [tex]\(51 \, \text{g}\)[/tex] of [tex]\(NaNO_3\)[/tex] at [tex]\(40^\circ \text{C}\)[/tex].
To find the minimum amount of water needed to dissolve [tex]\(51 \, \text{g}\)[/tex] of [tex]\(NaNO_3\)[/tex] at [tex]\(40^\circ \text{C}\)[/tex], we can use the solubility of [tex]\(NaNO_3\)[/tex] in water at that temperature.
At [tex]\(40^\circ \text{C}\)[/tex], the solubility of [tex]\(NaNO_3\)[/tex] is approximately [tex]\(90.0 \, \text{g}\) per \(100 \, \text{mL}\)[/tex] of water.
Given that you have [tex]\(51 \, \text{g}\)[/tex] of [tex]\(NaNO_3\)[/tex], you can set up a proportion to find out how much water would be needed to dissolve it:
[tex]\[\frac{51 \, \text{g}}{x \, \text{mL}} = \frac{90.0 \, \text{g}}{100 \, \text{mL}}\][/tex]
Where x represents the volume of water needed.
Solving for x:
[tex]\[x = \frac{51 \, \text{g} \times 100 \, \text{mL}}{90.0 \, \text{g}}\][/tex]
[tex]\[x = 56.67 \, \text{mL}\][/tex]
So, you would need a minimum of [tex]\(56.67 \, \text{mL}\)[/tex] of water to dissolve [tex]\(51 \, \text{g}\)[/tex] of [tex]\(NaNO_3\)[/tex] at [tex]\(40^\circ \text{C}\)[/tex].
In which reaction does the oxidation number of hydrogen change?
a.hcl (aq) + naoh (aq) → nacl (aq) + h2o (l)
b.2na (s) + 2h2o (l) → 2naoh (aq) + h2 (g)
c.cao (s) + h2o (l) → ca(oh)2 (s)
d.2hclo4 (aq) + caco3 (s) → ca(clo4)2 (aq) + h2o (l) + co2 (g)
e.so2 (g) + h2o (l) → h2so3 (aq)?
In a sealed bottle that is half full of water, equilibrium will be attained when water molecules
After the equation below has been balanced for a reaction in an acidic solution, what will the coefficients of the reactants and products be, in order? h2o2 + feso4 + h2so4 fe2(so4)3 + h2o
The nonmetals in groups 5a, 6a, and 7a question 15 options: lose electrons when they form ions. form ions with charges of 3–, 2–, and 1–, respectively. form positively charged ions. form ions with a numerical charge equal to their group number.
How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
In the general plan for balancing redox equations, when a reaction takes place in basic solution, you will need to add
Which structure corresponds to the predominant form of this molecule near ph 7?
At a neutral pH of 7, the amino acid exists in the zwitterionic form, with a positive charge on the nitrogen of the amino group and a negative charge on the oxygen of the carboxyl group. This is due to the molecule's ability to accept or donate protons.
Explanation:The structure of a molecule at a certain pH is affected by the molecule's ability to accept or donate protons. Amino acids, which are the molecule in question here, contain both carboxyl (-COOH) and amino (-NH2) groups. These groups can either donate or accept protons, depending on the pH of the environment.
At a pH less than 7, the environment is acidic and has a high concentration of protons. The carboxyl group tends to donate a proton and exist as COO-, while the amino group attracts protons and forms NH3+.
At pH 7, the environment is neutral. In this condition, amino acids usually exist in the zwitterionic (dipolar) form, where the carboxyl group is COO- and the amino group is NH3+.
At pH greater than 7, the environment is basic with a lower concentration of protons. Here, the amino group tends to donate a proton and exist mostly as NH2, while the carboxyl group remains COO-.
So, at pH 7, the predominant form of an amino acid would be the zwitterionic form, with a positive charge on the nitrogen of the amino group and a negative charge on the oxygen of the carboxyl group.
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When hydrogen burns, water vapor is produced. the equation is 2h2(g) + o2(g) → 2h2o(g). if 12 l of oxygen are consumed at stp, what volume of water vapor is produced?
At standard temperature and pressure, burning hydrogen gas reacts with oxygen to produce water vapor in a ratio where 12 liters of oxygen would produce 24 liters of water vapor, according to the stoichiometric relationship in the chemical equation.
When hydrogen burns, water vapor is produced according to the balanced chemical equation . This tells us that 2 volumes of hydrogen react with 1 volume of oxygen to produce 2 volumes of water vapor. Therefore, if 12 liters of oxygen are consumed at STP (standard temperature and pressure), an equivalent stoichiometric ratio would apply, and hence 24 liters of water vapor would be produced, because the ratio of oxygen to water vapor in the equation is 1:2.