We have to remember the rules to determine to which period and which group belongs an element, depending on its electronic configuration:
We always have to see the last level of energy, in this case is 3 (the highest number in the electronic configuration). It determines the period (the horizontal lines)
Now, we have to see the last letter which is with the 3, in this case the letter is p. It determines that the element is part of the A groups of the periodic table, also called the representative groups. In case of ending in d, it means that the element belongs to the transition metals. And trhe last possibility is ending in f, it means that the element belongs to the lanthanides and actinides.
The last thing, is to add up the valence electrons. Those are the ones in the last energy level, that as we mentioned before, it is 3 in this case. So, we have to add up, the exponents of the different letters that are in the last energy level. In this particular case, are the 2 and the 6, which is equal to 8.
So, we have to search in the periodic table, the element which is in the period 3, group VIII A. If we go, we will find it is the argon (Ar)
i need help with chemistry
Answer:
2.04×10^25
Explanation:
multiply with 10^9
Can I know the answer ？
According to the given statement Mass of one atom of gold in grams is 196.78 g.
What is a atom ?A chemical element is uniquely defined by its atoms, that are small bits of substance. An atom is made up of a core nucleus one and or more negatively charged electrons that orbit it. The positively charged, relatively hefty protons and neutrons that make it up the nucleus may be present.
Who discovered the atom?Up until the 1800s, this idea of tiny, indivisible pieces of matter remained. The contemporary atomic idea was really started by the eminent chemist John Dalton (1766–1844). But his atom was like a rock-solid ball.
Briefing:Molar mass is the weight in grams of one mole of an atom.
1 mole = 6.022×10²³ atoms
Molar mass of Gold (Au)
= mass of an atom × number of atoms
=3.207×10-²²×6.022×10²³
=196.78g.
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Create a diagram of your electroplating apparatus (an electrolytic cell). Then submit your drawing with the following terms labeled correctly. Or, beginning with the positive terminal of the battery and ending with the negative terminal of the battery, describe the path that the electricity takes and where each of the following occurs: anodecathodecopper stripbatterypositive terminalnegative terminalplace where oxidation occursplace where reduction occurselectrolyte solutioncoin (or nail)direction of electron flow
Please, look at the next drawing:
Electrolytic cell: Electrical energy is used to drive nonspontaneous redox reactions.
Oxidation half-reaction: Z- => Z + e- (anode)
Reduction half-reaction: Y+ + e- => Y (cathode)
ic
______ oil drop experiment measured the size of the ____ on the____ .
Millikan's oil drop experiment measured the size of the electric charge on the electron.
What is an Experiment?This is referred to as a type of procedure which is carried out in other to accept or refute a hypothesis. Electron on the other hand, is the negatively charged subatomic particle which is present in an atom and are involved in the formation of new substances during a chemical reaction.
Millikan's oil drop experiment measured the size of the electric charge on the electron and used tiny drops of oil which helped in the calculation of the charge and the mass of an electron.
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If gas has a pressure of 536 and a volume of 645 liters and is 352 moles what is the new temp ?
To solve this question we have to use the ideal gas law:
[tex]PV=nRT[/tex]Where P is the pressure, V is the volume, n the number of moles, R the constant of ideal gases and T the temperature.
Solve the equation for T and replace for the given values. Remember that R has a value of 0.082atmL/molK:
[tex]\begin{gathered} T=\frac{PV}{nR} \\ T=\frac{536atm\cdot645L}{352mol\cdot\frac{0.082atmL}{molK}}=11977.54K \end{gathered}[/tex]According to this, the temperature of the gas is 11977.54K.
Calculate the AHrxn from the AH of formation for the following reaction. C2H4(g) + 302(g) 2C02(g) + 2H20(1). Formation AH values for C2H4(g) = 52.30 kJ/mol, for 02(g) = 0 kJ/mol, for CO2(g) = -393.5 kJ/mol and for H20(1) =-285.8kJ/mol.A. -1305kJB. 1350kJC. 1411kJD. -1411kJ
Answer
A. -1305 kJ
Explanation
Given:
Equation: C2H4(g) + 302(g) ---- > 2C02(g) + 2H20(l).
Formation ΔH values:
for C2H4(g) = 52.30 kJ/mol,
for 02(g) = 0 kJ/mol,
for CO2(g) = -393.5 kJ/mol, and
for H20(1) = -285.8kJ/mol.
What to find:
The ΔHrxn from the ΔH of formation for the given reaction.
Step-by-step solution:
ΔHrxn = (Sum of ΔH formation for the product) - (Sum of ΔH formation for the reactants).
ΔHrxn = (ΔH for 2CO2(g) + ΔH for 2H2O(l)) + (ΔH for C2H4(g) + ΔH for 3O2(g))
ΔHrxn = [(2 x -393.5) + (2 x -285.8)] + [52.30 + (3 x 0)]
ΔHrxn =(-787.0 - 571.6) + (52.30 + 0)
ΔHrxn = -1358.6 + 52.30
ΔHrxn = -1306.3 kJ
so the closest answer is A. -1305 kJ
Predict the products for each of the following reactions. Write the molecular equation, the complete ionic equation, and the net ionic equation. Classify the reactions in as many ways as you can.
Aqueous sodium carbonate is added to aqueous hydrochloric acid.
The equation that is the net description of the ions involved is;[tex]CO_{3} ^{2-} (aq) + 2H^{+} (aq)----- > H_{2} O(l) + CO_{2} (g)[/tex]
What is the net ionic equation?The term net ionic equation has to do with the final ionic equation which does not include the spectator ions. What I mean by the spectator ions are those ions that do not undergo a change in a chemical reaction. The first step when we want to write the net ionic equation is first to write down the molecular equation and balance the equation accordingly.
We shall now show the balanced overall reaction equation of the process
Thus, the balanced molecular equation of this reaction is; [tex]Na_{2} CO_{3} (aq) +2 HCl(aq) ----- > NaCl(aq) +H_{2} O(l) + CO_{2} (g)[/tex]
The net ionic equation is;
[tex]CO_{3} ^{2-} (aq) + 2H^{+} (aq)----- > H_{2} O(l) + CO_{2} (g)[/tex]
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The pH of an aqueous solution at 25°C was found to be 7.80.
The pOH of this solution is
The hydronium ion concentration is
M.
The hydroxide ion concentration is
M.
The pOH of this solution is 6.2 as pH is 7.80, The hydronium ion concentration is 1.58*10^-8 M, The hydroxide ion concentration is 6.3*10^-7 M
What is pH?
pH is a numerical indicator of how acidic or basic aqueous or other liquid solutions are. The phrase, which is frequently used in chemistry, biology, and agronomy, converts the hydrogen ion concentration, which typically ranges between 1 and 1014 gram-equivalents per litre, into numbers between 0 and 14. The hydrogen ion concentration in pure water, which has a pH of 7, is 107 gram-equivalents per litre, making it neutral (neither acidic nor alkaline). A solution with a pH below 7 is referred to as acidic, and one with a pH over 7 is referred to as basic, or alkaline.
pKw = pH + pOH
14 = 7.80+ pOH
pOH = 14 -7.80 = 6.2
pH = - log [H+]
[H+] = 1.58*10^-8 M
pOH = - log [OH-]
[OH-] = 6.3*10^-7 M
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What is kinetic energy related to?
ОА.
heat
OB.
position
O C.
motion
OD. electricity
Kinetic energy refers to the work required to accelerate a body from an initial state of rest to infinite speed. So kinetic energy is related to the motion and speed of a body.
So the answer will be C. motion
can someone please help me with question 27 B please!
Answer:
Sodium carbonate + Nitric acid → sodium nitrate + water + carbon dioxide. - To write the balanced chemical reaction between sodium carbonate and nitric acid we should know the chemical formula of them. - The chemical formula of sodium carbonate is Na2CO3 and the chemical formula of nitric acid is HNO3
Explanation:
hope it help
Tablet salt (sodium chloride) is an example of a(n): A) element B) compound C) mixture
Sodium chloride contains sodium and chlorine in its structure. Both are elemens, which means that sodium chloride is a compound.
It is not a mixture since it is not made of 2 different substance. It is a substance made of 2 elements, which means it is a compound.
The correct answer is B) compound.
Hydrochloric acid is prepared by bubbling hydrogen chloride gas through water. What is the concentration of a solution prepared by dissolving 225 l of hcl g at 37
Answer:
149 M
Explanation:
Which of the following statements does not describe the structure of an atom?
The electron cloud is a small and compacted space around the nucleus.
Inside the nucleus of an atom are protons and neutrons.
Protons are positively charged sub-atomic particles.
Electrons are negatively charged sub-atomic particles.
Answer:
A. The electron cloud is a small and compacted space around the nucleus.
Explanation:
Hope this helps! :))
Use the balanced equation to solve the problem.Na₂CO3 +CaCl2 → 2NaCl + CaCO3115g of CaCl₂ react.How many moles of NaCl are made?mol
2.0724moles
Explanations:Given the balanced chemical reaction between Na2CO3 and CaCl2 expressed as:
[tex]Na_2CO_3+CaCl_2\rightarrow2NaCl+CaCO_3[/tex]Given the following parameters
Mass of CaCl₂ = 115g
Determine the moles of CaCl₂
[tex]\begin{gathered} moles\text{ of CaCl}_2=\frac{mass}{molar\text{ mass}} \\ moles\text{ of CaCl}_2=\frac{115}{110.98} \\ moles\text{ of CaCl}_2=1.0362moles \end{gathered}[/tex]According to stochiometry, 1 mole of CaCl2 prodcues 2 moles of NaCl. The moles of NaCl requred is given as:
[tex]\begin{gathered} moles\text{ of NaCl}=2\times1.0362 \\ moles\text{ of NaCl}=2.0724moles \end{gathered}[/tex]Therefore moles of NaCl made is 2.0724moles
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.
Na(s) + O₂(g) → Na₂O₂ (s)
Answer: 2Na(s)+O₂(g) → Na₂O₂ (s)
Explanation: Since there is only one sodium on the left side of the equation and 2 on the right all you have to do is put a 2 in front of the sodium on the left
Balance each of these reactions and indicate the type of reaction each equation represents: a) NH3 → N2 + H2 b) Ba(C2H3O2)2 + Na3PO4 → Ba3(PO4)2 + NaC2H3O2 c) Zn + HCl → ZnCl2 + H2 d) Hg + O2 → HgO
Answer:
Explanation:
Here, we want to balance the chemical equation and state the type of chemical reaction
In balancing the chemical equation, we have to ensure that the number of atoms we have on the left hand side is same as what we have on the right hand side
We have this as:
[tex]3Ba(C_2H_3O_2)_2+2Na_3PO_4\text{ }\rightarrow Ba_3(PO_4)_2+6NaC_2H_3O_2[/tex]To get the type of reaction, we can see that there is an exchange of ionic groups between the individual metallic ions
This type of reaction is called a double displacement reaction
explain the process of photosynthesis with these
Words:
Photosynthesis,
light,
water,
energy,
Carbon Dioxide,
Oxygen,
xylem,
stomata,
Sugar(Glucose),
phloem,
chloroplasts,
leaves,
roots
Be legible and neat please and thank you
Explanation:
PHOTOSYNTHESIS
This is a process in which green plants and other organisms such as bacteria and algae manufacture their own food from simple inorganic matters such as sunlight,CO2,water to produce O2,glucose and water .Plants gets water and minerals when the roots absorbs from the ground,Xylem transports water and mineral salts from the roots to all parts of the plant i.e leaves.Photosynthesis takes place in the leaves where Co2 diffuse to a leaf via the stomata and reach the chloroplast.The chloroplast maximize absorption of sunlight energy.At the end of the process,water,oxygen and glucose is produced.The manufactured food is transported to all parts of a plant from the leaves via the Phloem tissues.6.50×104 +8.70×105
[?]
? ]×10¹ ?
Answer:
9.35 × 10⁵
Explanation:
6.50x10⁴=6500
8.70×10⁵=870000
65000+ 870000= 935000=9.35 ×10 ⁵
Fill in the Blanks
Type your answers in all of the blanks and submit
- current answer: When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen. Consider this reaction to answer the questions below: When properly balanced the sum of the coefficients for this reaction = - 7 -. When you decompose 71.7 grams of potassium chlorate you can form a maximum of - blank2 -grams of potassium chloride and - blank3 -grams of oxygen.
When solid potassium chlorate is heated in the laboratory it decomposes to form potassium chloride and oxygen.
Consider this reaction to answer the questions below:
When properly balanced the sum of the coefficients for this reaction =
blank1 - Word Answer
7
.
When you decompose 71.7 grams of potassium chlorate you can form a maximum of
blank2 - Word Answer
Please type your answer to submit
grams of potassium chloride and
blank3 - Word Answer
grams of oxygen.
There is 1 error to address before submitting
Unanswered1 attempt left
Submit
Answer:
The correct answer is option C. Slavery is a degrading institution to all those involved. Explanation: As Douglass narrates, slavery not only degrades slaves, but slavers asWhich of the following sentences best describes Douglass’s opinion about slavery?
PLEASE HELPPP! It’s due today! Will Mark Brainliest!
Usually scientists will a large isotope such as Uranium-235 with a ____.
The collision results in several more nuclear fissions, also known as a ____. This results in a HUGE release in energy!
Answer:
Fission and fusion
Explanation: Fission and fusion are two physical processes that produce massive amounts of energy from atoms.
Hope this helps!
How much heat in kJ is released when 0.677 mol NaOH(soln) is dissolved in water? (ΔH(soln) = –44.5 kJ/mol for NaOH)NaOH(s) rightwards arrow Na+(aq) + OH–(aq) + 44.5 kJ/mol
Explanation:
The dissolution reaction of NaOH is:
NaOH (s) -----> Na⁺ (aq) + OH⁻ (aq) + 44.5 kJ/mol
ΔH(soln) = –44.5 kJ/mol
This reaction is exothermic, because the ΔH is negative. That's why the 44.5 kJ/mol appears in the products side, because heat is being released.
From the ΔH of solution we know that 1 mol of NaOH will realease 44.5 kJ when it dissolves. We have to find the heat released by 0.677 mol of NaOH.
Heat released = 0.677 moles * (-44.5 kJ/mol)
Heat released = - 30.1 kJ
Answer: -30.1 kJ is released when 0.677 mol of NaOH is dissolved.
Predict the products of the reaction described above (Information Section).Ca(NO3)2 + Li > _______ + _____
A chemical reaction is known to be balanced if the number of elements on the reactant side is equal to that of the product.
Given the reactant of a chemical reaction between calcium nitrate and Lithium, the balanced reaction is given as:
[tex]Ca(NO_3)_2+2Li\rightarrow Ca+2LiNO_3[/tex]Hence the product of the balanced chemical reaction are Calcium and Lithium Nitrate.
When dealing with diatomic elements like oxygen, the atoms are not separate; they always come in pairs. Therefore, one mole of oxygen molecules would weigh _______ grams and not 16 grams
32 grams
Explanations:What are diatomic elements?Diatomic elements are elements that contain two atoms chemically bonded together.
When looking for the molar mass of a diatomic element, the number of atoms in the element is multiplied by the molar mass of the element.
For instance, oxygen is a diatomic element with the chemical symbol of O₂. This shows that the molar mass of oxygen will be given as:
[tex]\begin{gathered} molar\text{ mass of O}_₂=2\times16g\text{/mol} \\ molar\text{ mass of }O_2=32g\text{/}mol \end{gathered}[/tex]This shows that one mole of oxygen molecules would weigh 32 grams and not 16 grams.
9. A possible variant of gold has a mass of 192. Is this variant an isot
many neutrons does it have?
a. Yes; 79
b. No; 192
c. Yes; 113
d. Yes, 118
A possible gold variant has a mass of 192. Yes, it has 79 neutrons in this variant.
What is meant by variant?A variant is an additional version of something. Chimps, apes, and gorillas are all members of the primate family. Words frequently have variant spellings, which differ from region to region or country to country. The British and American colors are variations. A variant is an alternate spelling or form of an entry word. Variants follow the entry word in boldface and are preceded by or or also. The label or indicates that the variant is as common as, or nearly so, as the entry word. A variation is something that differs from a norm or standard, whereas a variant differs from other things in its own class that is, it does not necessarily differ from a norm or standard.The neutron is a subatomic particle with the symbol n or n0 that has a neutral charge and a slightly larger mass than a proton. Atomic nuclei are made up of protons and neutrons.To learn more about neutrons, refer to:
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Determine the [H3O+] of a 0.150 M solution of benzoic acid.
The [H₃O⁺] of a 0.150 M solution of benzoic acid is 0.00515 M.
Benzoic acid is classified as a weak acid and it dissociates partially when it is dissolved in water. Benzoic acid has chemical formula as C₆H₅COOH and it produce the benzoate anion which is [C₆H₅COO⁻] with a hydronium cation which is [H₃O⁻].
We know that constant Ka = 1.77 x 10⁻⁴
We will write the equilibrium reaction as -
C₆H₅COOH + H₂O → H₃O⁺ + C₆H₅COO⁻
0.150 M x x x
Ka = [H₃O⁺] [C₆H₅COO⁻]
C₆H₅COOH
1.77 x 10⁻⁴ = x₂
0.150
We will solve to get the value of x -
x = [H₃O⁺] = 0.00515 M
Therefore, [H₃O⁺] is 0.00515 M.
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How many moles of copper(l) oxide contain 1.20 x 10^23 copper atoms? Include units and name of atom/molecule.
ANSWER
Number of moles = 0.1993 mole
STEP-BY-STEP EXPLANATION:
Given particles
[tex]\begin{gathered} \text{Number of particles = 1.20 }\cdot10^{23} \\ \text{Avogadro's number = }6.022\cdot10^{23} \end{gathered}[/tex]The formula for calculating moles is written below
[tex]\text{Number of moles = }\frac{Number\text{ of particles}}{\text{Avogadro's number}}[/tex]The next thing is to substitute the above parameters into the above formula
[tex]\begin{gathered} \text{Number of moles = }\frac{1.20\cdot10^{23}}{6.022\cdot10^{23}} \\ \text{Number of mole = }\frac{1.20}{6.022} \\ Number\text{ of moles = 0.1993 mole} \end{gathered}[/tex]Consider the balanced chemicalreaction below and determine thepercent yield for carbon dioxide if 4.50moles of propane yielded 7.64 moles ofcarbon dioxide.C3H8 +502 + 3CO2 + 4H2O-→
To solve this, we must know some terms:
% Yield = (Actual yield / Theoretical yield) x 100
Actual yield is already given = 7.64 moles
To obtain the theoretical yield, we use stoichiometry and proceed like this:
C3H8 + 5O2 => 3CO2 + 4H2O
1 mole C3H8 ------- 3 x 1 mole CO2
4.5 moles C3H8 ------ x
x = 13.5 moles
Therefore, our % yield:
% Yield = (7.64 moles/13.5 moles) x 100 = 57 % approximately
Answer: % yield = 57 %
Sulfur (S) has an atomic number of 16. What is the ground-state electron configuration of sulfur?
Use the concentrations given to determine whether each of the following is acidic, neutral, or basic.A. [H+] = 4.3 × 10-3 mol/LB. [H+] = 9.8 × 10-12 mol/LC. [OH-] = 4.8 × 10-2 mol/L
We have the concentration of H+ ions, from these concentrations we can find the pH values of the solutions with the following equation:
[tex]pH=-log\lbrack H^+\rbrack[/tex]Where [H+] is the concentration of H+ ions.
Now, the acidity or basicity of a solution depends on the pH value. A solution above 7 will be basic, below 7 will be acidic, and equal to 7 will be neutral.
Let's determine the pH value for each solution:
[tex]\begin{gathered} pH=-log\lbrack4.3\times10^{-3}mol/L\rbrack \\ pH=2.4 \end{gathered}[/tex][tex]\begin{gathered} pH=-log\lbrack9.8\times10^{-12}mol/L\rbrack \\ pH=11.0 \end{gathered}[/tex][tex]\begin{gathered} pH=-log\lbrack4.8\times10^{-2}mol/L\rbrack \\ pH=1.3 \end{gathered}[/tex]So, we have that:
A. [H+] = 4.3 × 10-3 mol/L. pH=2.4. Acidic
B. [H+] = 9.8 × 10-12 mol/L pH = 11.0 Basic
C. [OH-] = 4.8 × 10-2 mol/L pH=1.3 Acidic
why is presence of nitrogen essential in the atmosphere?Explain in simple words.
Explanation: