Answers
Answer:
The answer is option C.
Hope this helps you
Related Questions
In which two places is aggregate generally found? A.floodplains and alluvial fans B.alluvial fans and mines C.mines and beneath the topsoil D.beneath the topsoil and above the topsoil ED2020
Answers
Answer:
A.floodplains and alluvial fans .
Explanation:
Hope it helps.
Answer:A)
Explanation:
hello:) is hydrogen chloride and hydrochloride acid the same??
Answers
Answer:
No because hydrogen chloride is gas and hydrochloric acid is (as stated in the name) an acid. The formula for hydrogen chloride is HCI(g), the little g states that the compound is a gas and the formula for hydrochloric acid is HCl(aq) and the little aq means aqueous.
Answer:
no. they are not the same
Explanation: Although, they both do have the same chemical formula HCL, they differ in their states of matter. Hydrogen chloride is a gas whereas hydrochloric acid is a solution of hydrogen chloride gas and water( creates an aquaeous solution). Hydrochloric acid is highly corrossive.
a compound contains 28.6 magnesium 14.3 carbon 57.1 oxygen what is the empirical formula
Answers
Answer:
Option 3
[tex]MgCO_{3}[/tex]
Explanation:
These are the steps for empirical forumla
1) If given percentage, assume everything in grams
2) Convert those grams to moles (using specific molar mass of each unique element)
3) Divide all the moles by the smallest mole you discovered.
4) Answer will be close to a whole number for each element and that's the answer.
First step, 28.6 g Mg, 14.3 g C, 57.1 g O
Second step:
28.6/24.305 = 1.1767 Mg
14.3/12.01= 1.1907 C
57.1/16.00 = 3.5688 O
Third step:
1.1767/1.1767 = 1 Mg
1.1907//1.1767 ~ 1 C
3.5688/1.1767 ~ 3 O
Put everything together you get!
[tex]MgCO_{3}[/tex]
The empirical formula for the compound is:
C. [tex]MgCO_3[/tex].
What is an Empirical formula?A chemical formula showing the simplest ratio of elements in a compound rather than the total number of atoms in the molecule.
Given:
28.6 g Mg, 14.3 g C, 57.1 g O
In order to determine empirical formula we will divide mass of each given element with the molar mass of the respective element.
[tex]\frac{28.6}{24.305} = 1.1767 Mg[/tex]
[tex]\frac{14.3}{12.01}= 1.1907 C[/tex]
[tex]\frac{57.1}{16.00} = 3.5688 O[/tex]
Dividing each mass with the lowest mass:
[tex]\frac{1.1767}{1.1767 } = 1 Mg[/tex]
[tex]\frac{1.1907}{1.1767 } = 1 C[/tex]
[tex]\frac{3.5688}{1.1767} =3 O[/tex]
Thus, the empirical formula for the compound is [tex]MgCO_3[/tex].
Therefore, option C is correct.
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What type of nuclear decay is shown by the reaction below?
2390 → He + 23% Th
O A. Fusion
B. Alpha
C. Beta
D. Gamma
Answers
Answer:
B. Alpha
Explanation:
Alpha decays always split into an element and He.
Beta decays always split into an element and e- (eletrons).
Gamma decays always split into an element and radiation.
What does percent composition tell you about a molecule?
O A. It tells you the ratio of elements in the molecular formula.
O B. It tells you how the elements are arranged in the molecule.
O C. It gives you the total number of atoms in the molecule.
D. It tells you how much of a molecule is made up of each element.
Answers
In an lonie lattice:
A atoms are bonded to four others in a
Tetrahedral shapes
atoma are packed together in a
regular euble arrangement
e. atoms are bonded with a single
bonds and one double bond
D. atoms are structured in a vast
network of atoms
Reset Selection
Answers
Answer:
atoms are bonded with a single bond one double bond
Balance each of the following chemical equations:
a. N2(g) + O2(g) → NO(g)
b. HgO(s) = Hg(l) + O2(8)
c. Fe(s) + O2(g) →→ Fe2O3(s)
d. Na(s) + Cl2(g) →→ NaCl(s)
e. Cu2O(s) + O2(g)
→ CuO(s)
Answers
Answer:
a. N₂(g) + O₂(g) → 2 NO(g)
b. 2 HgO(s) → 2 Hg(l) + O₂(g)
c. 4 Fe(s) + 3 O₂(g) → 2 Fe₂O₃(s)
d. 2 Na(s) + Cl2(g) → 2 NaCl(s)
e. 2 Cu₂O(s) + O₂(g) → 4 CuO(s)
Hope this helps.
Which is the electron configuration for zinc?
1. 1s22s22p63s23p64s2308
2. 1s22s22p63s23p64513d10
3. 1s22s22p53s23p64523010
4. 1s22s22p63s23p64523010
Answers
Answer:
The electron configuration for zinc is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰. To find electron configuration, simply follow the periodic table from top to bottom, left to right (basically increasing atomic number) until you reach the element you are looking for.
Calculate the mass (in grams) of hydrogen gas produced when 33.61 g of
diborane (B2H) reacts with excess water.
B Holg) + 6H2O(1)→ 2 H3B03(s) + 6H2(g)
Only enter numerical value without units.
Answers
Answer:
14.40g of H2
Explanation:
The balanced equation for the reaction is given below:
B2H6(g) + 6H2O(l) → 2H3BO3(s) + 6H2(g)
Next, we shall determine the mass of B2H6 that reacted and the mass of H2 produced from the balanced equation. This is illustrated below:
Molar mass of B2H6 = (2x11) + (6x1) = 28g/mol
Mass of B2H6 from the balanced equation = 1 x 28 = 28g
Molar mass of H2 = 2x1 = 2g/mol
Mass of H2 from the balanced equation = 6 x 2 = 12g
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Finally, we shall determine the mass of H2 produced when 33.61g of B2H6 reacted with excess water. This can be obtained as follow:
From the balanced equation above,
28g of B2H6 reacted to produce 12g of H2.
Therefore, 33.61g of B2H6 will react to produce = (33.61 x 12)/28 = 14.40g of H2.
Therefore, 14.40g of H2 were produced from the reaction.
The kinetic-molecular theory of gases says A. the particles of a gas move independently of each other. B. the particles in a gas move rapidly. C. the particles in a gas are far apart. D. all of the above.
Answers
Answer:
D. all of the above.
Explanation:
The kinetic-molecular theory of gases suggests that; the particles of a gas move independently of each other, the particles in a gas move rapidly, the particles in a gas are far apart.
Hope it helps.
PLEASE HELP!
Why is phosphorus diamagnetic.
Answers
Answer:
FROM the magnetic point of view, phosphorus is an extremely interesting
substance because of its allotropic modifications. The ordinary forms are
the yellow (or white) and the red varieties. X-ray investigations indicate
that probably yellow phosphorus is analogous with the cubic forms of antimony and arsenic; and red phosphorus with monoclinic antimony and
arsenic (Mellor, 1928). The conclusions of different workers on the structure of red phosphorus are not in agreement. There is also Bridgman's black
phosphorus which is probably hexagonal (Linck and lung, 1925). Natta
and Passerini (1930) have studied the crystal structure of white phosphorus.
This substance when condensed at the temperature of liquid ammonia is
cubic. Atomic positions however are yet undetermined. Another and noncubic form is obtained by condensation at liquid-air temperatures. It is
thus clear that most likely white phosphorus is cubic in structure with a
probable superposition of another lattice.
The evidence from Raman effect also points to the same conclusion.
Bhagavantam (1930) investigated the Raman effect of white phosphorus in
the solid state. The characteristic frequencies obtained by him are 607, 468
and 374. Since the phosphorus molecule is known to contain 4 atoms,
Bhagavantam (1930) has shown that the tetrahedral structure fits the results
satisfactorily since such a structure would give only three frequencies. But
for the particular law of forces adopted, the frequencies should have the
ratio 2: 2: 1 but the observed frequencies deviate considerably.
Phosphorus is a really intriguing element. because of the allotropic changes to the material.
Why phosphorus is dimagnetic?Red phosphorus is likely akin to monoclinic antimony, while yellow phosphorus is probably similar to the cubic forms of antimony and arsenic.
There is disagreement among the findings of many researchers regarding the structure of red phosphorus. Additionally, Bridgman's black It is presumably hexagonal, phosphorous (Linck and lung, 1925). Natta and Passerini (1930) have investigated the white phosphorus crystal structure.
Condensed from this material at liquid ammonia temperature is cubic. However, the locations of the atoms are still unknown. Condensation at liquid air temperatures yields a different, noncubic shape.
Therefore, Phosphorus is a really intriguing element. because of the allotropic changes to the material.
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Which compound is used to make asphalt? a saturated hydrocarbon that has more than 35 carbons in its chain a saturated hydrocarbon that has between 17 and 35 carbons in its chain a saturated hydrocarbon that has between 5 and 8 carbons in its chain a saturated hydrocarbon that has between 1 and 2 carbons in its chain
Answers
Answer:
answer is A. a saturated hydrocarbon that has more than 35 carbons in its chain
Explanation:
edge in 2020 :)
The compound which is used to make asphalt is a saturated hydrocarbon that has more than 35 carbons in its chain.
What is asphalt?Asphalt is also known by the name of bitumen, its appearance is sticky and black or present in semi solid form of petroleum.
Asphalt is a kind of hydrocarbon means mainly formed by the composition of carbon atoms and hydrogen atoms, but in very trace quantity amount of nitrogen, sulfur and other hateroatoms are also present. It is present in complex form means both saturated and unsaturated or aliphatic and aromatic compounds are present in it. It is formed by the long carbon chain which has a number of Carbon atoms around 150.
Hence it is a saturated hydrocarbon that has more than 35 carbons.
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Scientific evidence shows that Earth's diameter, and thus overall size, does.
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
U
C. Contracting Earth
D. Continental drift
SUBMIT
Answers
Answer:
Expanding earth and contracting earth
Explanation:
Answer:
A and C
Explanation:
4. Which change to a DNA molecule would have the least effect on an organism?
A: an addition to a base sequence at the beginning of a gene
B: a substitution in a base sequence that does not code for a protein
C: a substitution that creates a "stop" code in the middle of a gene
D: a deletion from a base sequence in the middle of a gene
Answers
Answer: Change in a single nitrogen base in the DNA sequence will not have any significant effect on the organism.
So A
Explanation:
This is known as point mutation and it does not have any significant change in the protein and it is least harmful type of DNA mutation.
Which temperature in Celsius (°C) does this thermometer show? –8° 0° 25° 32°
Answers
Answer:
0° Celsius
Explanation:
The thermometer shows 0° Celsius which corresponds to 32° F.
Answer:
0 degrees celsius
Explanation:
just did the test
what sentence describes all atoms of one element A. They have the same number of isotopes B. They have the same properties C. They have the same number of protons D.They have the same number of neutrons
Answers
Answer:
C. They have the same number of protons.
Explanation:
Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.
Hope it helps.
seasonal variation in Earth's climate are caused by
a Earth's rotation
b Earth's tilt
c Earth's magnetic field
d Earth's precession
Answers
Earth’s tilt exposes different parts of the earth to varying degrees of sunlight throughout the year, causing seasons.
Answer: B: Earths tilt
Explanation:
Seasonal variation occurs because the Earth is tilted on its axis by 23.5˚. As Earth orbits the sun, its orientation to the sun changes.
Which statement describes an effect of large asteroid and comet impacts?
Answers
Answer:
They could cause an organism and population and species to die.
Explanation:
If the asteroid hits on ground, there would be a colossal amount of dust thrown up into the atmosphere and our world. If it hits in water and ocean , then there would be a huge surge in water vapor in the atmosphere. This would result in an increase in rain resulting in landslides and mudslides
Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
A)The fireworks produce colors.
B)The fireworks give off heat.
C)Igniting the fireworks requires energy
D)Igniting the fireworks makes an odor.
Answers
Answer:B
Explanation:
TOOK DA TEST
As the firework releases heat, it is considered as exothermic reaction. The correct option is B.
What is exothermic reaction?An exothermic reaction is one in which the energy required to break bonds in the reactants is less than the energy released when new bonds form in the products.
Energy is constantly released during an exothermic reaction, often in the form of heat. Exothermic reactions characterize all combustion reactions.
Endothermic reactions are chemical reactions that produce products by absorbing heat energy from their surroundings.
Exothermic reactions are important in forensic science, particularly in the investigation of fires and explosions.
Endothermic refers to a chemical reaction that requires heat and results in cooling of the surroundings.
As fireworks are releasing energy in the form of heat, it can be called as an exothermic reaction.
Thus, the correct option is B.
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7. Write a formula for each of the following:
(a) an alkane with 22 carbon atoms
(b) an alkene with 17 carbon atoms
(c) an alkyne with 13 carbon atoms.
Answers
Answer : The formula for each of the following is:
(a) [tex]C_{22}H_{46}[/tex]
(b) [tex]C_{17}H_{34}[/tex]
(c) [tex]C_{13}H_{24}[/tex]
Explanation :
Alkanes are hydrocarbon in which the carbon atoms are connected with single covalent bonds.The general formula of alkanes is [tex]C_n H_{2n+2}[/tex] where n is the number of the carbon atoms present in a molecule of alkane.
Alkenes are hydrocarbon in which the carbon atoms are connected with double covalent bonds.The general formula of alkenes is [tex]C_n H_{2n}[/tex] where n is the number of the carbon atoms present in a molecule of alkene.
Alkynes are hydrocarbon in which the carbon atoms are connected with triple covalent bonds.The general formula of alkynes is [tex]C_n H_{2n-2}[/tex] where n is the number of the carbon atoms present in a molecule of alkyne.
(a) An alkane with 22 carbon atoms
Putting n = 22 in the general formula of alkane, we get the formula of alkane as, [tex]C_{22}H_{2(22)+2}[/tex] or [tex]C_{22}H_{46}[/tex]
(b) An alkene with 17 carbon atoms
Putting n = 17 in the general formula of alkene, we get the formula of alkene as, [tex]C_{17}H_{2(17)}[/tex] or [tex]C_{17}H_{34}[/tex]
(c) An alkyne with 13 carbon atoms
Putting n = 13 in the general formula of alkyne, we get the formula of alkyne as, [tex]C_{13}H_{2(13)-2}[/tex] or [tex]C_{13}H_{24}[/tex]
Answer:
[tex]\huge \boxed{{C_{22} H_{46} \ \ \ \ C_{17} H_{34} \ \ \ \ C_{13} H_{24}}}[/tex]
Explanation:
[tex]alkanes \ \Rightarrow \ C_n H_{2n+2}[/tex]
[tex]C_{22} H_{2(22)+2}[/tex]
[tex]C_{22} H_{44+2}[/tex]
[tex]C_{22} H_{46}[/tex]
[tex]alkenes \ \Rightarrow \ C_n H_{2n}[/tex]
[tex]C_{17} H_{2(17)}[/tex]
[tex]C_{17} H_{34}[/tex]
[tex]alkynes \ \Rightarrow \ C_n H_{2n-2}[/tex]
[tex]C_{13} H_{2(13)-2}[/tex]
[tex]C_{13} H_{26-2}[/tex]
[tex]C_{13} H_{24}[/tex]
how many dots would go around xenon in electron dot diagram
Answers
Answer:
8
Explanation:
Since Xe (xenon) is a noble gas, it has 8 valence electrons. It's outer shell is full and it is a stable element and doesn't like to react. Therefore, since the electron dot diagram is about valence electrons, 8 would be your answer.
14.
Two jewelers were asked to measure the
mass of a gold nugget. The true mass of the
nugget is 0.856 grams (g). Each jeweler took
three measurements. The average of the
three measurements was reported as the
"official” measurement with the following
results:
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Which jeweler's official measurement was
more accurate? Which jeweler's measure-
ments were more precise? In each case, what
was the error and percent error in the official
measurement?
Answers
Answer:
Jeweler B = more accurate
Jeweler A = more precise
Error:
0.008, 0
% error :
0.934% ; 0
Explanation:
Given that:
True mass of nugget = 0.856
Jeweler A: 0.863 g, 0.869 g, 0.859 g
Jeweler B: 0.875 g, 0.834 g, 0.858 g
Official measurement (A) = 0.863 + 0.869 + 0.859 = 2.591 / 3 = 0.864
Official measurement (B) = 0.875 + 0.834 + 0.858 = 2.567 / 3 = 0.8556
Accuracy = closeness of a measurement to the true value
Accuracy = true value - official measurement
Jeweler A's accuracy :
0.856 - 0.864 = - 0.008
Jeweler B's accuracy :
0.856 - 0.856 = 0.00
Therefore, Jeweler B's official measurement is more accurate as it is more close to the true value of the gold nugget.
However, Jeweler A's official measurement is more precise as each Jeweler A's measurement are closer to one another than Jeweler B's measurement which are more spread out.
Error:
Jeweler A's error :
0.864 - 0.856 = 0.008
% error =( error / true value) × 100
% error = (0.008/0.856) × 100% = 0.934%
Jeweler B's error :
0.856 - 0.856 = 0 ( since the official measurement as been rounded to match the decimal representation of the true value)
% error = 0%
hi:) how to do question 3?:)
Answers
Answer:
5
Explanation:
Distilled water has a pH of 7 while CO2 is slightly acidic and therefore if we combine both substances we should get a pH just below 7 which if 5
Answer:
A) 5
Explanation:
5
The pH of distilled water immediately after distillation is 7, but within hours after distillation, it has absorbed carbon dioxide from the atmosphere and become acidic with a pH of 5
how many bonds are present in NCl3
Answers
What goes in the rest?
Answers
Answer:
E. Mass number
H. Ion
F. Isotopes
I hope you have a great day. I'm sorry that I didn't know C or I.
Drag each label to the correct location. Match the climate zones to their relative temperature levels. (coldest zonehottest zonemoderate temperature zone)
Answers
Answer:
Polar Zones - Coldest Temperature
Temperate Zones - Moderate Temperature
Tropical Zones - Hottest Temperature
Explanation:
The closer you are to the Equator, the hotter it gets, as the sun hits the middle of the Earth the most. At the poles, the sun hits it there the least, so it is the coldest. In between, we would have a mild between hot and cold.
*Remember that the Earth is at a tilt, and that is why we have seasons and why the Equator is so hot and the Poles are so cold.
Answer:
I answered the question on edmentum and that person was correct.
Explanation:
The polar zone is the coldest because the Sun’s rays hit this part of Earth at a wide angle, causing their energy to be spread thinly over a large surface area.
The topical zone is the hottest because the Sun’s rays hit this part of Earth nearly straight on, focusing the heat on a small surface area.
The temperate zone experiences moderate temperatures because the Sun’s rays hit this zone at an angle that concentrates the heat on a surface area that is smaller than on the polar zone and larger than on the tropical zone.
Compound is the fundamental type of matter that has unique set of properties and cannot be broken down into simpler form.
Answers
Answer: Compound
Explanation: pure substance that cannot be broken down into simpler substances by chemical or physical means. Each element has unique physical and chemical properties.
For the galvanic (voltaic) cell Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s) (E°= 0.77 V at 25°C), what is [Fe2+] if [Mn2+] = 0.040 M and E = 0.78 V?
Assume T is 298 K
Answers
Answer:
0.01836 M
Explanation:
Again the reaction equation is;
Fe(s) + Mn2+(aq) → Fe2+(aq) + Mn(s)
E°cell= 0.77 V
Ecell= 0.78 V
[Mn2+] = 0.040 M
[Fe2+] = the unknown
n=2
From Nernst's equation;
Ecell= E°cell- 0.0592/n log Q
0.78= 0.77 - 0.0592/2 log [Fe2+] /[0.040]
0.78-0.77= - 0.0592/2 log [Fe2+] /[0.040]
0.01/ -0.0296= log [Fe2+] /[0.040]
-0.3378= log [Fe2+] /[0.040]
Antilog(-0.3378) = [Fe2+] /[0.040]
0.459= [Fe2+] /[0.040]
[Fe2+] = 0.459 × 0.040
[Fe2+] = 0.01836 M
The Fe ion concentration in the galvanic cell has been 0.0186 M.
The Nernst equation has been used for the determination of the voltage of the galvanic cell.
It can be given as:
[tex]\rm E_c_e_l_l\;=\;E_0\;-\;\dfrac{0.059}{n}\;\times\;log\;\dfrac{[Fe^+]}{[Mn^2^+]}[/tex]
where, n = number of electrons transfer = 2
[tex]\rm E_0[/tex] = initial voltage = 0.77 V
[tex]\rm E_c_e_l_l[/tex] = cell voltage = 0.78 V
Iron ion concentration = 0.040 M
Susbstituting the values:
0.78 = 0.77 - [tex]\rm \dfrac{0.059}{2}\;\times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]
0.78 - 0.77 = -0.0296 [tex]\rm \times\;log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]
-0.03378 = [tex]\rm log\;\dfrac{[Fe^2^+]}{[0.040]}[/tex]
antilog (-0.03378) = [tex]\rm \dfrac{[Fe^2^+]}{0.040}[/tex]
Iron ion concentration = 0.0186 M
Thus, the Fe ion concentration in the galvanic cell has been 0.0186 M.
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How many grams of carbon dioxide does a hummingbird emit daily?
Answers
Answer:
3.5 g CO2
Explanation:
A hummingbird emits up to 3.5 grams of CO2 a day.
Equation:7.9 x 10‒2mol CO2x (44.01 g CO2/ 1 mol CO2)
=3.5 grams
Hope this helps!
Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 + 3CO —> 2Fe + 3CO2. What does this tell you
about the relative amounts of iron oxide and iron consumed and produced in this equation?
A. For every two moles of iron oxide consumed, one mole of iron is produced,
B. For every two grams of iron oxide consumed, one gram of iron is produced.
C. For every gram of iron oxide consumed, two grams of iron are produced
D. For every mole of iron oxide consumed, two moles of iron are produced.
Answers
Answer:
Option D. For every mole of iron oxide consumed, two moles of iron are produced.
Explanation:
The balanced equation for the reaction is given below:
Fe2O3 + 3CO —> 2Fe + 3CO2
From the balanced equation above,
1 mole of iron oxide, Fe2O3 reacted with 3 moles of carbon monoxide, CO to produce 2 moles of iron, Fe and 3 moles of carbon dioxide, CO2.
Thus, with a careful observation of the equation, we can conclude that for every 1 mole of iron oxide, Fe2O3 consumed, 2 moles of iron, Fe are produced.