Answer:
It is Se.
hope this helps.
What does the sum of oxidation numbers need to equal for a charged compound?
Answer:
The charge on the compound
Explanation:
The charge on the compound signifies that the compound is not in its neutral state.
Therefore, the oxidation state would be equal to the charge on the compound.
Answer:
The charge on the compound
Explanation:
The charge on the compound signifies that the compound is not in its neutral state.
Therefore, the oxidation state would be equal to the charge on the compound.
How many grams of Cl are in 515 g CaCl2 ? mass:
The explanation is in the picture
what type of matter is gold, an element used in making jewlery?
Answer:
Pure gold belongs to ELEMENT because it purely consists of one single element, which is Aurum (Au.)
Explanation:
When pure gold is mixed with other elements to make jewelry, it becomes a mixture.
help me this is due soon
Answer:
Hot magma change climate continents drift block sunlight folded mountains form rock deposits
Explanation:
brainliest now
When two or more magnetic fields overlap, the result is always a _____.
A combined magnetic field
B force of repulsion
C change in the location of the poles
D force of attraction
Answer:
A. Combined magnetic field
Answer:
A.combined magnetic field
Explanation:
CARRY ON LEARNING#
In the reaction between 15.8 g of NH3 and 22.7 g oxygen, water and nitrogen monoxide are
produced. Determine which reactant is limiting and calculate the number of grams of each
product.
Explanation:
limiting is NH3
NO:27/88g
H2O: 25/09g
Where are the most greenhouse gases generated during the production of electricity?
Answer: city w
Explanation:
cities w,y,z all use renewable energy (sun, water, wind) which offput any greenhouse emmissions,
city w uses coal which produces greenhouse gases when used (burnt).
hope this helped! ♡
What separation technique would most likely be used if a solvent were
saved?
A. Melting point separation
B. Distillation separation
C. Density separation
O D. Chromatography separation
The statement, that describes separation technique would most likely be used if a solvent were saved is "distillation separation."
What is separation technique?Separation techniques are methods for separating two different states of matter, such as liquid and solid. Methods that employ variations in physical qualities to separate the components of a mixture, such as evaporation, distillation, filtration, and chromatography, can be used to physically separate the components of a mixture.
Simple distillation is a technique for removing a solvent from a solution. Water, for example, can be extracted from salt solution by simple distillation. If a solvent was saved, the separation procedure would most likely be used is distillation.
Hence the correct option is B.
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state one possible mistake in a simple distillation setup and explain the significance of the mistake.
Answer:
liquid is heated. As the liquid is heated, the molecules within it gain the energy to escape the liquid phase and transition into the gas phase in the form of bubbles.
Explanation:
Argon gas has a temperature of 180°C at a pressure of 900 torr. If the gas is heated to 370°C, what is the new pressure of Argon gas in atmospheres (atm)? (Hint: 1 atm = 760 torr)
Based on the calculations, the final pressure of this gas sample at 370°C is equal to 2.66 atm..
Given the following data:
Initial temperature = 180°C.
Final temperature = 370°C.
Initial pressure = 900 torr.
Conversion:
760 torr = 1 atm.
900 torr = 1.29 atm.
How to determine the final pressure.In order to calculate the final pressure of an ideal gas at constant volume, we would apply Gay Lussac's law.
Mathematically, Gay Lussac's law is given by this formula;
[tex]P\;\alpha \;T\\\\P=kT[/tex]
Where:
P is the pressure.T is the temperature.k is the constant of proportionality.Substituting the given parameters into the formula, we have;
[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2} \\\\\frac{1.29}{180} =\frac{P_2}{370} \\\\0.0072 =\frac{P_2}{370}\\\\P_2 = 0.0072 \times 370[/tex]
Final pressure = 2.66 atm.
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Ca(NO3)2(aq) + KCl(aq) →
Express your answer as a chemical equation.
The chemical equation is
[tex]\rm Ca(NO_ 3)_2 (aq) + 2KCl (aq) \rightarrow CaCl_2 + 2KNO_3[/tex]
What are chemical equation?Chemical equation is defined as a symbolic representation of a chemical reaction in the form of symbols, in which the reactants and products are expressed in terms of their respective chemical formulas. It can also be called as chemical reactions.
There are basically six types of chemical reactions.
Combination reactionDecomposition reactionPrecipitation reactionNeutralization reactionCombustion reactionDisplacement reactionThus, the chemical equation is
[tex]\rm Ca(NO_ 3)_2 (aq) + 2KCl (aq) \rightarrow CaCl_2 + 2KNO_3[/tex]
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. Calculate how many times greater the change in phosphorous levels between 1965 and 1975 is than between 2008 and 2014. Show your work.
The number of times phosphorous is greater in not visible in the data
How to calculate the change in Phosphorus levelsThe steps involved for calculating the times the change in phosphorus level are :
First step: Determine the difference between Phosphorus levels in 1965 and 1975
Second step: Determine the difference between Phosphorus levels in 2008 and 2014
Last step: Determine the quotient by dividing first step by second step
Hence can conclude that The number of times phosphorous is greater in not visible in the data.
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Attached below is the missing Image related to your question
Am nevoie rapid de aceste exercitii
Answer:
I will find the answer for you
Explanation:
Just a minute
Starting with the following equation,
BaCl2(aq) + Na3PO4(aq) → Ba3(PO4)2(S) + NaCl(aq)
Calculate the mass in grams of BaCl2 that will be required to produce 50.5 grams of Ba3(PO4)2.
In the double displacement reaction between BaCl₂ and Na₃PO₄, 52.4 g of BaCl₂ are required to produce 50.5 g of Ba₃(PO₄)₂.
What is stoichiometry?Stoichiometry refers to the relationship between the quantities of reactants and products before, during, and following chemical reactions.
Step 1: Write the unbalanced equation.BaCl₂(aq) + Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + NaCl(aq)
Step 2: Balance the equation.We will use the trial and error method. We will:
Multiply BaCl₂ by 3 to balance Ba atoms.Multiply Na₃PO₄ by 2 to balance P atoms.Multiply NaCl by 6 to get the balanced equation.3 BaCl₂(aq) + 2 Na₃PO₄(aq) → Ba₃(PO₄)₂(s) + 6 NaCl(aq)
Step 3: Calculate the mass of BaCl₂ required to produce 50.5 g of Ba₃(PO₄)₂.The mass ratio of BaCl₂ to Ba₃(PO₄)₂ is 624.69:601.93.
50.5 g Ba₃(PO₄)₂ × 624.69 g BaCl₂/601.93 g Ba₃(PO₄)₂ = 52.4 g BaCl₂
In the double displacement reaction between BaCl₂ and Na₃PO₄, 52.4 g of BaCl₂ are required to produce 50.5 g of Ba₃(PO₄)₂.
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Which solution would have the highest concentration of [H+] ions?
O a solution with a pH of 8
O a solution with a pH of 12
O a solution with a pH of 10
a solution with a pH of 6
A 5.00 L flask at 25˚ C contains 0.200 mol of Cl2 . What is the pressure in the flask?
Answer:
Your answer would be:
0.98atm.
Explanation:
The pressure of a gas can be calculated by using the following expression:
PV = nRT
P = pressure
V = volume
-----------------------------------
n = number of moles
R = gas law constant
T = temperature
P × 5 = 0.2 × 0.0821 × 298
5P = 4.893
P = 4.893 ÷ 5 = 0.98atm
P = 0.98atm
In conclusion, the pressure of a 5.00 L flask at 25 degrees C. that contains 0.200 mol of Cl2 is 0.98atm.
Have a great rest of your day
#TheWizzer
Answer:
Hello, senzawahl SORRY IF I SPELLED YOUR NAME INCORRECT
Prime here ready to solve your question :)
so your correct answer is 0.98atm.
Explanation:
Stay safe
-prime
how many moles of methane are produced when 4.53 mol co2 reacts
Answer:
2.25 moles
Explanation:
thats correct answer
Thank you
I2 is produced by the reaction of 0.4235 mol of CuCl2 according to the following equation: 2CuCl2+4KI⟶2CuI+4KCl+I2. What volume of I2 gas is produced at STP?
Answer: 4.7432 L
Explanation:
Use stoichiometry: .4235 mol CuCl2 (1 mol I2 / 2 mol CuCl2)(22.4 L / 1 mol I2) = 4.7432 L :)
How much energy is needed to completely boil a 5.05g sample of water?
Use the process of photosynthesis and cellular respiration to describe why the drought has driven the bears into the towns.
The process of photosynthesis and cellular respiration is usually at the barest minimum when drought occurs.
What is Photosynthesis?This is the process in which green plants manufacture their food through the presence of light energy from the Sun.
During drought, there is no water which reduces photosynthetic activity of plants. This leads to shortage of food thereby making bears to come into town in search of food.
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3.50 grams of an unknown metal was placed in a graduate cylinder containing 50.0
mL water initially. What is the density of this unknown metal if the final reading from
the graduate cylinder was 65.0 mL?
For 3.50 grams of an unknown metal was placed in a graduate cylinder containing 50.0mL water initially, the density of this unknown meta is mathematically given as
D= 0.23 g/ml
What is the density of this unknown metal if the final reading from the graduate cylinder was 65.0 mL?Generally, the equation for the Volume of water is mathematically given as
Vw= Volume of water after metal addition - Volume of water initial
Therefore
Vw = 65 ml - 50 ml
Vw= 15 ml
In conclusion,
D= Mass of metal / Volume
D= 3.5 / 15
D= 0.23 g/ml
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Chem dissociation!
Calculate degree of dissociation of electrolyte, if you know that in the 2 M solution there is 0.2 mol of this electrolyte as ions.
Answer:
C. Strong electrolytes can be expected to 100% dissociate in aqueous solution
Explanation:
Explain ionization suppressants as applied to atomic spectrometry
An ionization suppressor is an alkali metal capable of preventing ionization, which can be used in atomic spectroscopy to determine matter composition.
What is ionization?Ionization refers to the phenomena capable of converting neutral atoms/molecules to electrically charged atoms/ions.
Ionization is a process by which radiation (e.g., alpha, beta, gamma rays) can pass energy to inert matter.
Some examples of ionization suppressors include salts of alkali metals (for example, potassium), which can be used in atomic spectroscopy to determine matter composition.
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Which statement is true of all proteins? (1 point)
They are created by mutations in DNA.
They carry oxygen in human blood.
Their main function is to cause mutations.
Their structure is related to their function.
Answer:
Their structure is related to their function.
Explanation:
Protein structure is related to their function. Therefore, the correct option is option D among all the given options.
What is protein?Proteins are huge biomolecular and macromolecular structures made up of one or even more long amino acid residue chains. Proteins serve a wide range of roles inside animals, including catalyzing metabolic events, DNA replication, reacting to stimuli, provides support to organisms and cells including transporting chemicals.
Proteins differ largely in their amino acid sequence, which is determined by the genetic code from their genes and generally culminates with protein folding into such a particular 3D structure that dictates its function. Protein structure is related to their function.
Therefore, the correct option is option D.
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Determine whether or not the mixing of each of the two solutions indicated below will result in a buffer.
Drag the appropriate items to their respective bins.
Sinve CH3NH2 is weak base and its salt is CH3NH3Cl, mixing 125.0 mL of CH3NH2 and 120.0 mL of CH3NH3Cl so produce a buffer.
What is a buffer?A buffer is a solution which resists changes to its pH when a small quantity of strong acid or base is added to it..
A buffer is made from a weak acid and its salt or a weak base and its salt.
From the given options, CH3NH2 is weak base and its salt is CH3NH3Cl.
Therefore, mixing 125.0 mL of CH3NH2 and 120.0 mL of CH3NH3Cl so produce a buffer.
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how would changing the proportions in an alloy change its properties
Answer:
An alloy is a mixture of two or more metals which is produced with a specific proportion between metals. So, if the proportion is changed the physical characteristic would be changed as well. For example, brass musical instruments are made of brass which is a mixture (an alloy) of zinc and copper in a specific proportion. If you change a proportion, you will change the physical characteristic of brass musical instruments, and a sound they produce will be different.
Explanation:
Which is most reactive out of calcium, potassium, and magnesium?
Answer:
As we have already discussed, reactivity of alkali metals tends to increase as you go down the group. Therefore, sodium is less reactive with water than is potassium, likewise with the alkaline metals; calcium is more reactive than magnesium
Question 13 options:
A) What is the volume (L) of 2.5 moles of oxygen at STP?
B) What is the volume (L) of 2.5 moles of nitrogen at STP?
At STP
one mol of oxygen weighs=22.4LNo of moles=2.5mol
Total volume:-
2.5(22.4)56LA 1.0 L solution AgNO3(ag) of and Pb(NO3)2(aq) has a Agconcentration of 0.020 M and a Pb2+ concentration of
0.0010 M. A 0.0010 mol sample of K2SO4(s) is added to the solution. Based on the information in the table above,
which of the following will occur? (Assume that the volume change of the solution is negligible.)
No precipitate will form.
(B) Only Ag2SO4(s) will precipitate.
(C) Only PbSO4(s) will precipitate.
(D) Both Ag2SO4(s) and PbSO4(s) will precipitate.
With an Ag concentration of 0.020 M and a Pb2+ concentration of
0.0010 M, Only PbSO4(s) will precipitate,
Option C is correct
What will precipitate?Generally, the equation for the Chemical Reaction is mathematically given as
Ag2SO4--->2Ag++SO4^{-2}
Where
PbSO4--->Pb2+ +SO4^{-2}
Therefore
Ag2SO4=[0.02^2[0.001]]
Ag2SO4=4*10^{-7}
and
PbSO4=[0.001^2[0.001]]
PbSO4=4*10^{-6}
In conclusion,Since PbSO4>>PAg2SO4, Only PbSO4(s) will precipitate.
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Find the mole fraction of Methanol CH3OH and water in a solution prepared by dissolving 4.5 g of alcohol in 40 g of H2O.