Answer:
0.200 M
Explanation:
Step 1: Given data
Mass of CoCl₂ (m): 2.60 gMolar mass of CoCl₂ (M): 130 g/molVolume of solution (V): 100 mLStep 2: Calculate the moles (n) of CoCl₂ (solute)
We will use the following expression.
n = m/M
n = 2.60 g/(130 g/mol)
n = 0.0200 mol
Step 3: Convert "V" to liters
We will use the conversion factor 1 L = 1000 mL.
100 mL × 1 L/1000 mL = 0.100 L
Step 4: Calculate the molarity of CoCl₂
We will use the definition of molarity.
[CoCl₂] = n/V(L)
[CoCl₂] = 0.0200 mol/0.100 L
[CoCl₂] = 0.200 M
The molar concentration of the solution is 0.2 M.
First, we must calculate the number of moles of CoCl2 as follows;
Number of moles = mass/molar mass
mass = 2.60g
Molar mass = 130.g/mol
Number of moles = 2.60g/ 130.g/mol = 0.02 moles
Molarity of solution = Number of moles/volume of solution in liters
Volume of solution = 100.mL or 0.1 L
Molarity of solution = 0.02 moles/0.1 L
Molarity of solution = 0.2 M
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Please don’t answer if you just want points
What is the empirical formula of the substance C6H14010?*
Answer:
[tex]\mathrm {CH_24}[/tex]
Explanation:
To determine the molecular formula, enter the appropriate value for the molecular mass. We get [tex]CH_{2}4[/tex] as our answer to the question.
Which number completes the balanced chemical equation showing the process of rusting?
4Fe + 3O2 ---> ____Fe2O3
A. 1
B. 2
C. 4
D. 12
Answer:
B. 2
Explanation:
HAPPYYYY TURKEY BREAK
Answer:
2
Explanation:
which type of experiment follows ethical standars?
A.Releasing contaminated waste into water system?
b. perfoming test on animals when the information can be obtained in other ways?
c. doing research on animals in which the animal experiences to fear or pain.
d. perfoming tests on people who cannot protect themselfs?
Answer:
A.Realesing contaminated waste into the water system
Explanation:
because if you you try it would really work
Choose the formula for ammonium.
ΝΗ,
b NH3
C
(NH)3N
Answer:
NH4+ will be ammonium, NH3 is ammonia which is the conjugate base of ammonium.
Explanation:
Similar cells with the same function, all working together for the same purpose, form the 2nd level of organization in an organism. This level is called a(n)
Answer:
tissue
Explanation:
cell→tissue→organ→systems→organism
You added 20 g of NaCl to 100g of water. What is the percent by mass of the solute? (Hint: You have not been given the total mass of the solution. This must be calculated
We are given:
Mass of solvent (water) = 100 grams
Mass of solute (NaCl) = 20 grams
Mass of the Solution:
Mass of Solution = Mass of Solute + mass of Solvent
100 + 20 = 120 grams
Mass Percent of NaCl:
We know that
mass percent of NaCl = (Mass of NaCl / Mass of Solution) * 100
replacing the variables
Mass% of NaCl = (20 / 120)*100
Mass% of NaCl = 100 / 6
Mass% of NaCl = 16.67%
Which statement about Fe is supported by the modern atomic theory but not John Dalton’s theory?
A. The element iron is composed of small particles called atoms.
B. The electrons of iron have probable locations in a region of space around the nucleus.
C. Iron atoms combine with other atoms in whole number ratios to form compounds.
D. Chemical reactions that involve iron do not create new atoms of iron.
Answer:
The correct option is B
Explanation:
One of the claims of John Dalton's atomic theory is that atom is the smallest unit of matter (which suggests that there are no particles smaller than an atom in any matter). This claim has been disproved by the modern atomic theory which established that there are particles smaller than atom (called subatomic particles). These particles are electrons, protons and neutrons.
One of the modern atomic theory was by Neils Bohr, who proposed that electrons move in circular orbits around the central nucleus. Thus, the electrons of iron can also be said to be present in a region of space (circular path) around the nucleus. This proves that option B is the correct option as John Dalton's theory did not even recognize the electron(s) nor the nucleus.
Answer:
b
Explanation:
Why did the hot water rise? Use faster, molecules, energy, density in your answer.
Answer:
Convection
Explanation:
Hot water will rise due to heat transfer by convection occurring in the heating system.
When a fluid is heated, the molecules will gain thermal energy. As the thermal energy of the liquid increases, the molecules will have heat which is average kinetic energy in the system. This causes them to be less denser and they rise in the cooking medium. As they rise, the colder part of the water sinks down to replace them in the pot. This exchange sets up convection cells in the heating medium.I need serious help
Answer:
with what may I ask?
Explanation:
enshdufhd
Answer:
No teooobh the awnser is carrot
Explanation:
Draw structures of the major organic products:
Answer:
b only
Explanation:
Which one is being shown in this picture?
Answer:
B. REFRACTION.
Is shown in fig.
Si, C, Ni which one is higher in ionization energy?
Answer:
I hope your having a good day, here is the answer to your following question:
C is the most highest energy...i just looked at a Periodic Trends — Ionization Energy
If i get it Right give brainlest
Explanation:
In a reaction, 25 g of reactant AB breaks down into 10g of Product A and an unknown amount of Product B. What is the mass of product B?
Answer:
Mass of product B = 15g
Explanation:
Reaction:
AB → A + B
Mass of AB = 25g
Mass of A = 10g
Unknown:
Mass of B = ?
Solution:
Based on the law of conservation of matter "matter is neither created nor destroyed but transformed from one form to another in a chemical reaction".
The amount of product = amount of reactant
Mass of AB = Mass of A + Mass of B
Now;
Mass of Product B = Mass of AB - Mass of A
Mass of product B = 25 - 10 = 15g
Mass of product B = 15g
What is the reason for the trend in Electron Affinity? Select all that apply.
A. number of protons in the nucleus
B. number of energy levels around the nucleus C. number of neutrons in the nucleus
D. larger atomic mass number
E. number of valence electrons.
Answer:
i think it a and d
Explanation:
How many grams of copper (II) nitrate would be produced from 0.80 g of copper metal reacting with excess nitric acid?
Answer:
[tex]m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]
Explanation:
Hello!
In this case, since the chemical reaction between copper and nitric acid is:
[tex]2HNO_3+Cu\rightarrow Cu(NO_3)_2+H_2[/tex]
By starting with 0.80 g of copper metal (molar mass = 63.54 g/mol) and considering the 1:1 mole ratio between copper and copper (II) nitrate (molar mass = 187.56 g/mol) we can compute that mass via stoichiometry as shown below:
[tex]m_{Cu(NO_3)_2}=0.80gCu*\frac{1molCu}{63.54gCu} *\frac{1molCu(NO_3)_2}{1molCu} *\frac{187.56gCu(NO_3)_2}{1molCu(NO_3)_2} \\\\m_{Cu(NO_3)_2}=2.36 gCu(NO_3)_2[/tex]
However, the real reaction between copper and nitric acid releases nitrogen oxide, yet it does not modify the calculations since the 1:1 mole ratio is still there:
[tex]4HNO_3+Cu\rightarrow Cu(NO_3)_2+2H_2O+2NO_2[/tex]
Best regards!
Amount of copper (II) nitrate would be produced is 2.25 gram
Molecular mass:Given that;
Amount of copper metal = 0.80 g
Find:
Amount of copper (II) nitrate would be produced
Computation:
Cu + 4HNO₃ → Cu(NO₃) + 2NO₂ + 2H₂O
Number of moles = Given mass / Molecular mass
Number of moles = 0.80 / 63.5
Number of moles = 0.012 mol
So,
n = Given mass / Molecular mass
0.012 = Given mass / 63.5 + (63.5 + 48)
Given mass = 2.25 gram
Amount of copper (II) nitrate would be produced = 2.25 gram
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Write the net ionic equation. An aqueous solution of sodium carbonate is added to an aqueous solution of calcium chloride. Calcium carbonate is precipitated
Answer:
Ca + CO₃²⁻ → CaCO₃
Explanation:
Solution:
Sodium carbonate = Na₂CO₃
Calcium chloride = CaCl₂
Calcium carbonate is precipitated
Reaction equation:
Na₂CO₃ + CaCl₂ → CaCO₃ + 2NaCl
The net ionic equation:
2Na⁺ + CO₃²⁻ + Ca + 2Cl⁻ → CaCO₃ + 2Na⁺ + Cl⁻
the spectator ions which both appears on both sides will cancel out and leave behind the net ionic equation:
Ca + CO₃²⁻ → CaCO₃
Why series fatty acid carbons seen in double from?
The 38 elements in groups 3 through 12 of the periodic table are called "Alkaline Earth Metals" O True O False
Answer:
FALSE
they're called transition metals
Answer:
false
Explanation:
The 38 elements in groups 3 through 12 of the periodic table are called "transition metals." As with all metals, the transition elements are both ductile and malleable, and conduct electricity and heat.
What is the reason for the trend in Atomic Radii? Select all that apply.
A. number of valence electrons.
B. number of neutrons in the nucleus
C. number of protons in the nucleus
D. larger atomic mass number
E. number of energy levels around the nucleus
What is the wavelength of a photon that has 4.42 x 10^8 of energy?
Answer:
λ = 4.5×10⁻³⁴ m
Explanation:
Given data:
Energy of photon = 4.42×10⁸ J
Wavelength of photon = ?
Solution:
Formula:
E = hc/λ
speed of light = c = 3×10⁸ m/s
planck's constant = h = 6.63×10⁻³⁴ Js
Now we will put the values in formula.
4.42×10⁸ J = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / λ
λ = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 4.42×10⁸ J
λ = 19.89×10⁻²⁶ Jm / 4.42×10⁸ J
λ = 4.5×10⁻³⁴ m
Two 1 kg masses are heated up on a hotplate for the same amount of time. One is made of copper, the other of iron. The copper one rises from 20°C to 30°C , but the iron one only goes from 20°C to 25°C. Explain why this happens.
Answer:
my explanation is best on conduction which is the process of heat being evenly distributed between or in metals and in this case copper absorbs heat faster than iron that's what I think
Is this chemical equation balanced? yes or no
Mg + 2O ---> 2MgO
Answer:
yes
Explanation:
So the balanced equation is 2 Mg + O 2 2 MgO.. ... Example: 2Mg + O2 -> 2MgO Magnesium and oxygen combine to form the compound magnesium oxide.
Thus, to balance the O2 we put a 2 in front of the MgO. However, now there are 2 Mg's in the products and only one Mg in the reactants. To balance the Mg we then put a 2 in front of the Mg in the reactant. All atoms are now balanced in the reaction
Answer:
Yes.
Explanation:
Oxygen has 2 atoms, and so does Magnesium.
Hope this helped! Have a good night!
In the reaction 2 Na(s) + F2(g) --> 2NaF (s), Given 12.5 g of fluorine with enough sodium, what mass of sodium fluoride forms?
Answer:
the mass of sodium fluoride is 15
Explanation:
One mole of F₂ or 38 g produces two moles or 84 g of NaF. Hence, 12.5 g of F₂ will produce 27.6 g of NaF.
What is sodium fluoride?Sodium fluoride is an ionic compound formed by the reaction of sodium metal and fluorine atom . Sodium metal loses one electron to fluorine and thus two moles of sodium and fluorine molecule produces 2 moles of NaF.
The molar mass of F₂ is 38 g. The molar mass of NaF is 42 g/mol. Thus mass of two moles of NaF is 84 grams. As per the balanced reaction, one mole or 38 g of F₂ produces two moles or 84 g of NaF. Thus mass of NaF is calculated as follows:
Mass of NaF = (12.5 g × 84 g) /38 g.
= 27.6 g.
Therefore, the mass of NaF produced by 12.5 g of F₂ in this reaction is 27.6 grams.
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sodium chloride is made from sodium and chloride. would you expect the properties of sodium chloride to be simliar to sodium or cloride
Answer:
No
Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride
The balanced half-reaction in which chlorine gas is reduced to the aqueous chloride ion is a ________ process. one-electron two-electron four-electron three-electron six-electron
Answer:
Two-electron.
Explanation:
Hello!
In this case, since the half-reaction by which chlorine is reduced to aqueous chloride ion is:
[tex]Cl^0_2\rightarrow 2Cl^-[/tex]
We can see each chlorine undergo a decrease of electrons by 1, it means that, since there are two chlorine atoms undergoing an electron decrease, we write:
[tex]Cl^0_2+2e^-\rightarrow 2Cl^-[/tex]
Which means this is a two-electron process.
Best regards!
Why do you think elements have these repeating patterns and groups of similar elements ? Explain your reasoning as much as you can.
Answer:
The elements in the periodic table are arranged in order of increasing atomic number. All of these elements display several other trends and we can use the periodic law and table formation to predict their chemical, physical, and atomic properties. Understanding these trends is done by analyzing the elements electron configuration; all elements prefer an octet formation and will gain or lose electrons to form that stable configuration.
Please give me brilliant answer
An electrochemical cell is composed of pure nickel and pure iron electrodes immersed in solutions of their divalent ions at room temperature (25°C). If the concentrations of Ni2+ and Fe2+ ions are 0.002 M and 0.40 M, respectively, what voltage is generated at 25°C? (The respective standard reduction potentials for Ni and Fe are −0.250 V and −0.440 V.)
Answer:
0.758 V.
Explanation:
Hello!
In this case, case when we include the effect of concentration on an electrochemical cell, we need to consider the Nerst equation at 25 °C:
[tex]E=E\°-\frac{0.0591}{n} log(Q)[/tex]
Whereas n stands for the number of moles of transferred electrons and Q the reaction quotient relating the concentration of the oxidized species over the concentration of the reduced species. In such a way, we can write the undergoing half-reactions in the cell, considering the iron's one is reversed because it has the most positive standard potential so it tends to reduction:
[tex]Fe^{2+}+2e^-\rightarrow Fe^0\ \ \ E\°=0.440V\\\\Ni^0\rightarrow Ni^{2+}+2e^-\ \ \ E\°=-0.250V[/tex]
It means that the concentration of the oxidized species is 0.002 M (that of nickel), that of the reduced species is 0.40 M and there are two moles of transferred electrons; therefore, the generated potential turns out:
[tex]E=(0.440V+0.250V)-\frac{0.0591}{2} log(\frac{0.002M}{0.40M} )\\\\E=0.758V[/tex]
Beat regards!
Introduction:
Briefly describe the physical behavior you investigated.
What is the exploration about?
What are you trying to discover?
Relate to any previous work.
Use new vocabulary words, if you can.
Answer: im not sure if this is the best answer but i wrote, "This exploration is about how the volume of a gas varies with temperature, and what the effect does to the gas and what effect it has on the results."
Explanation: hope this helps.
This exploration is about how the volume of a gas varies with temperature, and what the effect does to the gas and what effect it has on the results."
Thus, For persons with autism, life can be incredibly stressful at times, and their behaviour may be an indication of their utter exasperation or suffering in reaction to a variety of pressures.
Some people struggle with the idea of time and sequencing, thus this can involve onerous tasks, meeting new people, experiencing unpleasant sensory stimuli, a change in routine, switching activities, or having to wait for anything.
The individual may have realized how effective their actions could be in influencing their environment. A behaviour that was initially a reaction to physical discomfort or frustration may later develop into a strategy for evading a request or getting rid of an uncomfortable circumstance.
Thus, This exploration is about how the volume of a gas varies with temperature, and what the effect does to the gas and what effect it has on the results."
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The question is Incomplete, the complete question is:
Briefly describe the physical behavior?
What is the exploration about?
What are you trying to discover?
Relate to any previous work.
Use new vocabulary words, if you can.
In the exploration, I was a bird trying to eat bugs placed in different backgrounds. Each bug was adifferent color, and the color either matched or stood out against the background. What I wastrying to discover was how creatures adapted to their environment and if blending in with theirenvironment helped them or hindered them. I discovered that yes, blending in with theenvironment helps creatures survive.
A student drew a diagram of the quantum model of an atom, as shown.
A small circle is shown. Six light gray spheres and six dark gray spheres are shown inside the circle. On the outer side of the circle is another circle of larger radius. This circle has two small circle on its boundary. Another circle of even greater radius is on the outside of the second circle. This outermost circle has four small circles on its boundary.
Which of the following explains if the student's diagram is correct or incorrect?
A - The diagram is incorrect because electrons follow an elliptical path instead of a circular path.
B - The diagram is incorrect because the exact location of the electrons cannot be determined.
C - The diagram is correct because protons and neutrons are concentrated at the center of the atom.
D - The diagram is correct because electrons are present in distinct energy levels around the nucleus.
The diagram is correct because electrons are present in distinct energy levels around the nucleus. Option D
What is the quantum model?Let nus just take a minute to be able to remind ourselves that when we look at the atom that there are several subatomic particles that can be shown to be able to make up the atom. We know that the electron is the particle that can be shown to be arranged in shells.
What we saw in the inner or the core of the atom is the nucleus and the six grey spheres that we can see there would have to do with the nucleus of the atom that is in the question.
As we now look up at the shells, we can see the electrons as they have been arranged into the respective shells were they can be found in the atom on the basis of the energy that they possess.
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Question 24 (3 points)
Choose the element below that has correct information about the number of energy
levels/orbitals: (Use a period table to answer this question).
Lithium (Li) has one energy level
Sodium (Na) has three energy levels
Potassium (K) has three energy levels
Fluorine (F) has seven energy levels.
Answer:
sodium
Explanation: