Answer:
SO4 (aq) + Sr (aq) >> SrSO4 (s)
Explanation:
K+1 SO4-2 + Sr +2 I2- >> sK +1
(you dont separate and write down the ions for Sr SO4 because its a solid)
Cancel out the same ions from both sides and write down what your left with.
The density of lead, which has the FCC structure, is 11.36 . The atomic weight of lead is 207.19 . Use Avogadro's number: 6.02210. Calculatethe lattice parameter(Enter your answer to three significant figures.) = 2.75*10^21 the atomic radius of lead(Enter your answer to three significant figures.) =
Answer:
a
[tex]a_o = 4.95 *10^{-8} \ cm [/tex]
b
[tex]r = 1.7500 * 10^{-8} \ cm[/tex]
Explanation:
From the question we are told that
The density of lead is [tex]\rho_l = 11.36 \ g/cm^3[/tex]
The atomic weight is [tex]M_w = 207.19 \ g/mol[/tex]
The Avogadro's number is [tex]N_a = 6.022 * 10^{23} \ \frac{atom}{mol}[/tex]
Generally for FCC the number of atom is n = 4
Generally the volume of a unit FCC cell is mathematically represented
[tex]V = \frac{n * M_w }{N_a * \rho_l }[/tex]
[tex]V = \frac{4 * 207.19 }{ 6.022 * 10^{23} * 11.36 }[/tex]
[tex]V = 1.211 5 *10^{-22} \ cm^3[/tex]
Generally the lattice parameter is mathematically represented as
[tex]a_o = \sqrt[3]{V } [/tex]
[tex]a_o = \sqrt[3]{1.211 5 *10^{-22} } [/tex]
=> [tex]a_o = 4.95 *10^{-8} \ cm [/tex]
Generally the radius of the lead is mathematically represented as
[tex]r = \frac{a_o * \sqrt{2} }{4}[/tex]
=> [tex]r = \frac{4.95 *10^{-8} * \sqrt{2} }{4}[/tex]
=> [tex]r = 1.7500 * 10^{-8} \ cm[/tex]
The pKa of a weak acid can be determined from its titration curve.a. Trueb. False
Answer:
a. True
Explanation:
Yes, the titration curve can determine or can reveal the pKa value of a weak acid.
Titration is a scientific method to estimate the dissolved substance concentration, known as the titrand, in a known volume when it reacts with another chemical substance of known volume as well as concentration. The other substance is known as Titrant.
When a weak acid like acetic acid is titrated to a very strong base such as NaOH, the titration curve is obtained and the pH value is noted. But the titration curve of any weak acid shows a characteristic shape. At the end of titration, the acetic acid will convert into acetate ions.
pKa is the negative logarithm of the Ka of the acid. pKa is the pH of the acid where the concentration of the weak acid as well as the conjugate base is in equimolar concentration.
The label shown above contains information about some harmful effects of acetone.A group of students plans to use acetone to rinse out a glass container. A second group of students is working at the same lab table. Which of the following lab procedures should the second group of students avoid?
Answer:
Heating water with an open flame
Explanation:
Remember, we are told in the label that Acetone is a "flammable liquid and vapor." Being flammable means the substance can easily be set on fire, and we would expect an open flame from heating water to trigger an explosion (a disaster) in which the Acetone is set on fire causing life-threatening dangers to the second group of students.
What is the pH of a 0.045 M H2SO4 solution?
Answer:
pH = 1.05
Explanation:
A solution of sulfuric acid, H₂SO₄, dissociates in water as follows:
H₂SO₄ → 2H⁺ + SO₄²⁻
That means per mole of H₂SO₄ you will have 2 moles of H⁺
pH = -log [H⁺]
As [H₂SO₄] = 0.045M and [H⁺] = 2×[H₂SO₄]
[H⁺] = 0.090M
pH = -log [0.090M]
pH = 1.05describe how three of the organelles work together within a plant cell.NEED HELP ASAP
Use your periodic table to answer the following questions. Pay attention to the spelling of the element names and make sure to write the chemical symbols correctly. 1. What metal is found in the group 1 and period 4? __________________ 2. What metalloid is found in the group 16 and period 5? ______________ 3. What nonmetal is found in the group 17 and period 2? ______________ 4. In what group will you find copper? ____________________ 5. In what group will you find krypton? ____________________ 6. In what group will you find mercury? _______________________ 7. What is the symbol for chlorine? ___________________ 8. What is the symbol for lead? _____________________ 9. What is the symbol for tungsten? ______________________ 10. What is the symbol for antimony? _______________________ 11. What is the symbol for sodium? ______________________ 12. In what period will you find gold? __________________________ 13. In what period will you find silver? _________________________ 14. In what period will you find oxygen? _________________________ 15. In what groups will you find metalloids? ______ ______ _____ _____ 16. What element has the symbol H? _______________________ 17. What element has the symbol He? _______________________ 18. What element has the symbol Ca? ________________________ 19. What element has the symbol Co? ________________________ 20. What element has the symbol C?
Explanation:
1. K (Potassium)
2. Te (Tellurium)
3. F (Flourine)
4. group 11, period 4
5. group 18, period 4
6. group 12, period 6
7. Cl
8. Pb
9. W
10. Sb
11. Na
12. period 6, group 11
13. period 5, group 11
14. period 2, group 16
15. Groups 13–16 of the periodic table contain one or more metalloids
16. Hydrogen
17. Helium
18. Calcium
19. Cobalt
20. Carbon
1. K (Potassium)metal is found in the group 1 and period 4.
2. Te (Tellurium) metalloid is found in the group 16 and period 5.
3. F (Flourine)nonmetal is found in the group 17 and period 2.
4. Group 11, period 4 group will you find copper.
5. Group 18, period 4 group will you find krypton.
6. Group 12, period 6 group will you find mercury.
7. Cl is the symbol for chlorine.
8. Pb the symbol for lead.
9. W the symbol for tungsten.
10. Sb is the symbol for antimony.
11. Na is the symbol for sodium.
12. Period 6, group 11 period will you find gold.
13. Period 5, group 11 period will you find silver.
14. Period 2, group 16 of the periodic table contain one or more metalloids.
15. Groups 13–16 groups will you find metalloids.
16. Hydrogen element has the symbol H.
17. Helium element has the symbol He.
18. Calcium element has the symbol Ca.
19. Cobalt element has the symbol Co.
20. Carbon element has the symbol C.
What is mixture and compound?In chemistry mixture is a combination of two or more different chemical elements which are not chemically bond. A mixture is the physical combination of two or more elements in which their individual identities are retained and it also mixed by solutions, suspension and colloids.
In chemistry compound is combination of two or more different elements which are chemically bond. So compound is held by chemical bond. A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.
Therefore, 1. K (Potassium)metal is found in the group 1 and period 4.
2. Te (Tellurium) metalloid is found in the group 16 and period 5.
3. F (Flourine)nonmetal is found in the group 17 and period 2.
4. Group 11, period 4 group will you find copper.
5. Group 18, period 4 group will you find krypton.
6. Group 12, period 6 group will you find mercury.
7. Cl is the symbol for chlorine.
8. Pb the symbol for lead.
9. W the symbol for tungsten.
10. Sb is the symbol for antimony.
11. Na is the symbol for sodium.
12. Period 6, group 11 period will you find gold.
13. Period 5, group 11 period will you find silver.
14. Period 2, group 16 of the periodic table contain one or more metalloids.
15. Groups 13–16 groups will you find metalloids.
16. Hydrogen element has the symbol H.
17. Helium element has the symbol He.
18. Calcium element has the symbol Ca.
19. Cobalt element has the symbol Co.
20. Carbon element has the symbol C.
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Does solubility change with ph for CaBr2, CaCl2, Ca(OH)2 and MgCl2. What pH would you expect to see highest solubility?
Answer:
CaBr2 and CaCl2 solubility increases with increase in pH while the solubility of Ca(OH)2 and MgCl2 increases with decrease in pH.
Explanation:
Yes, solubility of compounds change with ph. The solubility of CaBr2 increases with the increase occurs in pH. The solubility of CaCl2 also increases with the increase in pH of a solution. On the other hand, the higher pH, decreases the solubility of Ca(OH)2 while with low pH, Ca(OH)2 solubility increases. MgCl2 solubility also increases with the decrease occurs in pH. There are different solubilities for different compounds , some compounds having highest solubility in acidic and some in basic.
When the CaBr2 and CaCl2 solubility rises with an increase in pH while the solubility of Ca(OH)2 and also MgCl2 increases with a reduction in pH.
What is Solubility Change?
Yes, When the solubility of combinations changes with ph. When The solubility of CaBr2 expansions with the increase occurs in pH. Then, The solubility of CaCl2 also increases with the accumulation in pH of a solution. On the different indicators, the higher pH decreases the solubility of Ca(OH)2 while with low pH, Ca(OH)2 solubility increases. MgCl2 solubility also increases with the decrease transpiring in pH. So, There are different solubilities for different compounds, When some compounds have the highest solubility in acidic and also some in basic.
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Does dead matter give off carbon dioxide
Explanation:
The animals and plants eventually die. Decomposers break down the dead organisms and return the carbon in their bodies to the atmosphere as carbon dioxide by respiration. In some conditions, decomposition is blocked. The plant and animal material may then be available as fossil fuel in the future for combustion.
Find volume of an object with the mass of 7.9g in the density of 2.28g/ ml
Answer:
The answer is
3.46 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} [/tex]
From the question
mass = 7.9 g
density = 2.28 g/mL
The volume is
[tex]volume = \frac{7.9}{2.28} \\ = 3.46491228[/tex]
We have the final answer as
3.46 mLHope this helps you
A 237g sample of molybdnum metal is heated to 100.1 0C and then dropped into an insulated cup containing 244 g of water at 10.0 0C. If the final temperature of the water and metal in the cup is 15.3 0C, then what is the specific heat of molybdenum?
Answer:
The specific heat of molybdenum is 0.254 joules per gram-Celsius.
Explanation:
We consider the system formed by the molybdenum metal and water as our system, a control mass inside an insulated cup, that is, a container that avoids any energy and mass interactions between system and surroundings.
From statement we notice that metal is cooled down whereas water is heated. According to the First Law of Thermodynamics, we know that:
[tex]Q_{metal} - Q_{water} = 0[/tex]
[tex]Q_{metal} = Q_{water}[/tex]
Where:
[tex]Q_{water}[/tex] - Heat received by water, measured in joules.
[tex]Q_{metal}[/tex] - Heat released by metal, measured in joules.
Now we expand this identity by definition of sensible heat:
[tex]m_{metal}\cdot c_{metal}\cdot (T_{m,o}-T) = m_{water}\cdot c_{water}\cdot (T-T_{w,o})[/tex]
The specific heat of the metal is cleared within equation above:
[tex]c_{metal} = \frac{m_{water}\cdot c_{water}\cdot (T-T_{w,o})}{m_{metal}\cdot (T_{m,o}-T)}[/tex]
If we know that [tex]m_{water} = 0.237\,kg[/tex], [tex]m_{metal} = 0.244\,kg[/tex], [tex]c_{water} = 4186\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]T_{w,o} = 10\,^{\circ}C[/tex], [tex]T_{m,o} = 100.10\,^{\circ}C[/tex] and [tex]T = 15.30\,^{\circ}C[/tex], the specific heat of molybdenum is:
[tex]c_{metal} = \frac{(0.237\,kg)\cdot \left(4186\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (15.30\,^{\circ}C-10\,^{\circ}C)}{(0.244\,kg)\cdot (100.10\,^{\circ}C-15.30\,^{\circ}C)}[/tex]
[tex]c_{metal} = 254.119\,\frac{J}{kg\cdot ^{\circ}C}[/tex]
The specific heat of molybdenum is 0.254 joules per gram-Celsius.
how do cultures form?
Explanation:
Human cultures, as communities of individuals, form when boundaries begin to occur within such communities, and when, through both adaptive and neutral mechanisms, the traits of each community—from language to decoration to technology—begin to diverge.
Societies are formed of our social groupings at varied levels, from small towns, through countries, to broader cultural groupings such as a Western society. Within such societies people tend to form particular cultures, formed of the ideas, customs, and social behaviors that make one society distinct from another.
For each image, select the state of matter represented.
Answer:
need image
Explanation:
The images most likely associated with this question are honey, salt, and oxygen. Honey is a liquid, salt is a solid, and oxygen is a gas.
(The pictures below are associated with this question.)
An equality states the same measurement, but in two different units.
True
False
Which complex ion can exhibit geometric isomerism? Assume that M is the metal ion, A and B are ligands, and the geometry is octahedral. a) [MA.12+ b) [MAB]2+ c) [MA4B2]2+ d) [MA3B312+
Answer:
[MA4B2]2+
Explanation:
Octahedral species are species that has a coordination number of of six. This means that six ligands are attached to the central metal atom/ion.
For any octahedral specie to exhibit geometrical or cis-trans isomerism, it must have the formula EX2Y4 as in [MA4B2]2+, hence the answer above.
PLEASE ANSWER. True or false: An inference explains an observation.
Answer:
true
Explanation:
Answer:
True
Explanation:
Observation is objective while inference is subjective.
2. Can the "facts” of science change over time? If so, how
Answer:
Yes
Explanation:
Some scientific facts are still under investigation of why it is true or not;i.e, science made us to believe that human evolution first started in the Sahara of East Africa which we don't know if it's true or not, but that's what the scientists said. And as of present days the new generations of scientists are still trying to testify if the facts are true, so it might change once their researches proved another facts differ from what we were taught.
What mass (g) of ammonium acetate contains 8.334 x 1024 hydrogen atoms?
Answer:
152.4 g
Explanation:
Step 1: Given data
Number of H atoms: 8.334 × 10²⁴ atoms
Step 2: Calculate the moles of H corresponding to 8.334 × 10²⁴ atoms of H
We will use Avogadro's number, that is, there are 6.022 × 10²³ atoms of H in 1 mole of H.
8.334 × 10²⁴ atom × (1 mol/6.022 × 10²³ atom) = 13.84 mol
Step 3: Calculate the moles of ammonium acetate (NH₄CH₃CO₂) that contain 13.84 moles of H
The molar ratio of NH₄CH₃CO₂ to H is 1:7. The moles of NH₄CH₃CO₂ that contain 13.84 moles of H are 1/7 × 13.84 mol = 1.977 mol.
Step 4: Calculate the mass corresponding to 1.977 moles of NH₄CH₃CO₂
The molar mass of NH₄CH₃CO₂ is 77.08 g/mol.
1.977 mol × 77.08 g/mol = 152.4 g
To which orbitals may 5d electrons make spectroscopic transitions in a hydrogenic atom?
A. np and nf
B. ns and nd
C. np and nd
D.ns and np
Answer:
A. np and nf
Explanation:
The electron distribution into energy levels or sublevels of atoms can be shown in their sublevel notations. This shows the sequence of filling electrons into the orbitals of the sublevels as guided by some principles such as the Aufbau Principle, Pauli Exclusion Principle, Hund's Rule of Maximum Multiplicity e.t.c
The maximum number of electrons in the orbitals of sublevels are two for s-sublevel(one orbital), six for p-level (three orbitals), ten for d-sublevel (five orbitals), and fourteen for f-sublevel (seven orbitals). This explains that the maximum number of electrons in an orbital is two.
To change from one unit to another in the metric system, multiply or divide by multiples of what number?
Answer:
10
Explanation:
no explanation need thats the right answer i gotchu g
Answer:10
Explanation:
no explanation need thats the right answer
The compound P4S3 is used in matches and reacts with oxygen through the chemical reaction shown below.
What mass of SO2 is produced from the combustion of 0.200 g P4S3?
P4S3 (s) + ------- O2 (g) ===> ------------ P4O10(s) + ----- SO2 (g)
Answer:
[tex]m_{SO_2}=0.175gSO_2[/tex]
Explanation:
Hello,
In this case, since the first step is to write the properly balanced chemical reaction:
[tex]P_4S_3 (s) + 8O_2 (g)\rightarrow P_4O_{10}(s) + 3SO_2 (g)[/tex]
We can see that given the 0.200 g of P4S3 (molar mass 220 g/mol) the mole ratio between it and SO2 (molar mass 64 g/mol) is 1:3, therefore, the produced mass of SO2 turns out:
[tex]m_{SO_2}=0.200gP_4S_3*\frac{1molP_4S_3}{220gP_4S_3} *\frac{3molSO_2}{1molP_4S_3} *\frac{64gSO_2}{1molSO_2} \\\\m_{SO_2}=0.175gSO_2[/tex]
Best regards.
Which of the following compounds has the most deshielded protons?A) CH3ClB) CH3IC) CH3BrD) CH4
Given :
Some compounds :
[tex]A)\ CH_3Cl\ B)\ CH_3I\ C)\ CH_3Br\ D)\ CH_4[/tex] .
To Find :
Which of the following compounds has the most deshielded protons .
Solution :
Deshielded means nucleus whose chemical shift has been increased due to removal of electron density, magnetic induction, or other effects .
In simple words deshielding means the ability to shift protons .
Now , among Cl , I , Br and H . Cl is the most electron negative .
Therefore , deshielding will be more in [tex]CH_3Cl[/tex] .
Hence , this is the required solution .
The compound with the presence of most deshielded protons has been [tex]\rm \bold{CH_3Cl}[/tex]. Thus, option A is correct.
Diesheilded protons have been explained as the shift in the protons of the central atom with the bonding to a more electronegative element.
The electronegative element has been possessing the negative charge and is attracted to the positive charge.There has been a shift in the protons in the sample that has been resulted in the de-shielded protons.
In the given compounds, the anions bonded to the methyl groups are Cl, C, Br, and H. Among the following, the most electronegative atom has been chlorine.
Thus, the molecule of [tex]\rm \bold{CH_3Cl}[/tex] has been consisted of the most de-shielded protons. Thus, option A is correct.
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What is convention? (not politically)
Answer:
a way in which something is usually done, especially within a particular area or activity.
Explanation:
please help 13 points!!! cell wall chloroplasts mitochondria small vacuoles eukaryote cells How would you change the characteristics in this list, to describe the cells of organisms in the PLANT kingdom? A) remove mitochondria B) change eukaryote to prokaryote C) change cell wall to cell membrane D) change small vacuole to large central vacuole
Answer:
A.
Explanation:
It’s just right
oxygen.
5. What role do chloroplasts and chlorophyll play in a plant cell?
what is sublimation and decantation
Answer:
Sublimation is when a solid transitions into a gas, without turning into liquid.
Decantation is when a mixture of liquids is allowed to separate, such that an element of the mixture may be removed.
Write a balanced chemical equation based on the following description:
aqueous silver nitrate reacts with aqueous nickel(II) chloride to produce solid silver chloride and aqueous nickel(II) nitrate.
Answer:
2 AgNO₃(aq) + NiCl₂(aq) ⇒ 2 AgCl(s) + Ni(NO₃)₂(aq)
Explanation:
Let's consider the double displacement reaction in which aqueous silver nitrate reacts with aqueous nickel(II) chloride to produce solid silver chloride and aqueous nickel(II) nitrate.
AgNO₃(aq) + NiCl₂(aq) ⇒ AgCl(s) + Ni(NO₃)₂(aq)
We have 2 atoms of Cl on the left side, so we will add a stoichiometric coefficient 2 to AgCl.
AgNO₃(aq) + NiCl₂(aq) ⇒ 2 AgCl(s) + Ni(NO₃)₂(aq)
Now, we have 2 atoms of Ag on the right side, so we will add a stoichiometric coefficient 2 to AgNO₃.
2 AgNO₃(aq) + NiCl₂(aq) ⇒ 2 AgCl(s) + Ni(NO₃)₂(aq)
Now, the equation is balanced.
The balanced chemical equation for the reaction is
2AgNO₃(aq) + NiCl₂(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)
To write a balanced chemical equation for the reaction between aqueous silver nitrate and aqueous nickel(II) chloride to produce solid silver chloride and aqueous nickel(II) nitrate
First, we will write the chemical formula for the each of the reactants and products
That is,
Silver nitrate - AgNO₃
Nickel(II) chloride - NiCl₂
Silver chloride - AgCl
Nickel(II) nitrate - Ni(NO₃)₂
Now, for the balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
2AgNO₃(aq) + NiCl₂(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)
Hence, the balanced chemical equation for the reaction is 2AgNO₃(aq) + NiCl₂(aq) → 2AgCl(s) + Ni(NO₃)₂(aq)
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A 50.00-g sample of metal at 78.0°C is dropped into cold water. If the metal sample cools to 17.0°C and the specific heat of metal is 0.108 cal/g·°C, how much heat is released?
Answer:−329.4 calorie
Explanation:Heat released by metal = q=m_mc_m(T_2-T1)q=m
m
c
m
(T
2
−T1)
m_m=50\ g\\c_m=0.108\ cal\ g^{-1}\ \degree C^{-1}\\q=50\times0.108(17-78)=-329.4\ caloriem
m
=50 g
c
m
=0.108 cal g
−1
°C
−1
q=50×0.108(17−78)=−329.4 calorie
Here minus sign indicate that heat is released
Which of the following matches is not correct?
A. IC12 - Linear ion B. 1C14 - Square planar ion C. XeF2 - Linear molecule D. SO42 - Trigonal planar ion
Answer:
SO42 - Trigonal planar ion
Explanation:
The SO4^2- ion is tetrahedral and not trigonal planar because the sulphur atom has four regions of electron density which includes the lone pair of electrons on sulphur atom.
This accounts for the observed tetrahedral arrangement of electron pairs around the central sulphur atom in SO4^2- ion, hence the answer.
Given the following Kb values, which cation is the strongest acid?
Base Kb
NH3 1.8 x 10-5
C2H5NH2 5.6 x 10-4
C5H5N 1.7 x 10-9
C8H10N4O2 5.3 x 10-14
(NH2)2CO 1.5 x 10-14
A. NH4+.
B. C2H5NH3+.
C. C5H6N+.
D. [C8H11N4O2]+.
E. [NH2NH3CO]+.
Answer:
The correct option is E
Explanation:
Generally the a base with the highest [tex]K_b[/tex] is the strongest base and from the data given
[tex]C_2H_5NH_2[/tex] has the highest value of [tex]K_b[/tex] so [tex]C_2H_5NH_2[/tex] is the strongest base while [tex](NH_2)_2CO[/tex] has the lowest value of [tex]K_b[/tex] so [tex](NH_2)_2CO[/tex] is the weakest base
Generally the conjugate acid of a weak base is always a strong acid
So
For [tex](NH_2)_2CO[/tex] which the weakest base it conjugate acid which is [tex][NH_2NH_3CO]^+[/tex] will be the strongest acid
How are coastal dunes and coastal plains similar?
Answer: Coastal dunes are a ridge, or a series of ridges, that form at the rear of a beach and differ from most other constructional coastal landforms in that they are formed by the movement of air (aeolian transport) rather than by tidal, wave, or current action.A coastal plain is a flat, low-lying piece of land next to the ocean. Coastal plains are separated from the rest of the interior by nearby landforms, such as mountains. In western South America, a large coastal plain lies between the Andes Mountains and the Pacific Ocean.
Explanation:
Answer: Both have low elevation.
Explanation:
hope it helped xx
