Answer:
.Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.
Explanation:
The transfer of thermal energy is called heat. In this process, thermal energy moves through a substance. For example, an ice cube has heat energy and so does a glass of lemonade.
For the following reaction, 8.00 grams of silicon tetrafluoride are allowed to react with 7.40 grams of water. silicon tetrafluoride (s) + water (l) hydrofluoric acid (aq) + silicon dioxide (s) What is the maximum amount of hydrofluoric acid that can be formed? grams What is the FORMULA for the limiting reagent? H2O What amount of the excess reagent remains after the reaction is complete? grams
Answer:
For the following reaction, 8.00 grams of silicon tetrafluoride are allowed to react with 7.40 grams of water. silicon tetrafluoride (s) + water (l) hydrofluoric acid (aq) + silicon dioxide (s) What is the maximum amount of hydrofluoric acid that can be formed? grams What is the FORMULA for the limiting reagent? H2O What amount of the excess reagent remains after the reaction is complete? grams
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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Element (20X) in the periodic table exist in:
It occurs in oxygen I think
Hot coffee with sugar (completely dissolved) is classified as?
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.
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.
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.
oxygen.
5. What role do chloroplasts and chlorophyll play in a plant cell?
An equality states the same measurement, but in two different units.
True
False
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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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]
K₂SO₄(aq) + SrI₂(aq) → 2KI(aq)+ SrSO₄(s) net ionic equation
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.
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
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.
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 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.
What is convention? (not politically)
Answer:
a way in which something is usually done, especially within a particular area or activity.
Explanation:
What is the best way to make sure an experiment is precise?
PLEASE ANSWER. True or false: An inference explains an observation.
Answer:
true
Explanation:
Answer:
True
Explanation:
Observation is objective while inference is subjective.
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.
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 = 1.05The 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.
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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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
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.)
Earth's gravitational potential energy: GPE = mgh = Gravity (9.81m/s2) Mass (kg) x Height (m) Kinetic energy: KE = mu? How do the mass and height of an object affect the gravitational potential energy? O A. Mass and height have the same effect on gravitational potential energy. O B. Mass has a greater effect than height on gravitational potential energy O C. Height has almost 10 times the effect on gravitational potential energy that mass has. D. Height has a greater effect than mass on gravitational potential energy.
Answer:
A
Explanation:
Earth's garvitational energy is directly proportinal to the mass and hight of a body. Thus mass and height have the same effect on gravitational potential energy.
What is gravitational potential energy ?Gravitational potential energy is the energy stored in a massive body relative to its position in gravitational field.
The gravitational potential energy of a massive body can be determined relative to the position of another body affected by gravity. As per the equation for gravitational potential energy i.e., Mgh, both height and mass of a body has equal influence on its gravity.
If and object falls from a large height it experience higher gravity. Similarly more massive body is largely affected by gravity.
Therefore, both mass and height have the same effect on gravitational potential energy
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The table below shows some information about four different elements.
Element
Classification
Density (g/cm³)
barium (Ba)
metal
3.6
beryllium (Be)
metal
1.8
chromium Cr)
metal
7.2
phosphorus P)
nonmetal
1.8
A cube of an unknown element has a shiny, silvery color. The side of the cube measures 2.0 cm and the cube has a mass of 14.56 g.
Based on the information in the table, which element makes up the cube?
barium
beryllium
chromium
phosphorus
Answer:
beryllium
Explanation:
Answer each part below.
A. Which organism labeled in this food web provides energy, either directly or indirectly, to all of the other organisms? Explain why this is your answer.
B. Explain why the amount of food available to the slug population might increase if the aphid population decreased.
Answer:
A- producers provide energy to all of the other organisms. they directly supply energy to primary consumers (animals who eat plants). They indirectly supply energy to other consumers by feeding the animals that they eat. The energy gets transferred from the producers to the primary consumers, to the secondary consumers, and to the tertiary consumers.
B- aphids and slugs both eat producers. if the aphid population decreases, there will be less competition for the slugs to eat the their food.
The element gold has a consistent melting point and color regardless of the physical changes that it goes through. This identifies gold as what type of substance?
Group of answer choices
A mixture
A physical property
A pure substance
A compound
Answer:
C
Explanation:
The element gold has a consistent melting point and color regardless of the physical changes. This identifies gold as a pure substance. The correct option is C.
What are pure substances?Pure substances are those that are made up of only one type of atom, and nothing is mixed in these substances. They are only one type of particle. They have fixed mass and structure.
Gold is an element that has an atomic number of 79. It is a bright yellow colored and shiny metal. It is used to make an ornament, which is made by mixing other metal to it.
Elements and compounds are subclasses of pure substances. A material that solely contains one type or class of atom is said to be an element. Gold is a pure substance, it is made by one type of atom which is Aurum (Au).
Thus, the correct potion is C. A pure substance.
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Most of the energy used in the United States comes from
Answer:
Energy in the United States comes mostly from fossil fuels: in 2010, data showed that 25% of the nation's energy originates from petroleum, 22% from coal, and 22% from natural gas.
Explanation:
It is really self explanitory
