Answer
Laws that are used by astronomers to learn about stars indirectly are as given below:-
Kirchhoff's First LawCassini's laws
21) What is the percent by mass of bromine in the compound MgBr₂?
A) 13.2%
B) 43.4%
C) 56.6%
D) 86.8%
Answer:
D 86.8%
Explanation:
Two bromines mole wt = 2 * 79.9 = 159.8 gm (from periodic table)
Mg = 24.3 gm
159.8 / ( 159.8 + 24.3) = .868 = 86.8 %
Electrons flow from the anode to the cathode in a/an _______________. Choose all that apply. Group of answer choices voltaic cell electrolytic cell galvanic cell
Answer:
galvanic cell or electrochemical cell
Explanation:
the electrolytic cell needs electric supply to make charges flow from anode to cathode while the galvanic cell doesn't.
The electrolytic cell needs electric supply to make charges flow from anode to cathode while the galvanic cell doesn't.
What is Electrolytic cell?A device that can produce electrical energy from the chemical reactions taking place inside it is called an electrochemical cell. Electrochemical cells include a common 1.5V cell seen in TV remotes and clocks as well as lithium-ion batteries found in smart phones.
Galvanic cells, often referred to as Voltaic cells, and electrolytic cells are the two forms of electrochemical cells.
"In galvanic cells, spontaneous redox reactions take place, converting chemical energy into electrical energy. As opposed to electrolytic cells, which use an external power source to drive internal chemical reactions, which transform electrical energy into chemical energy.
Therefore, The electrolytic cell needs electric supply to make charges flow from anode to cathode while the galvanic cell doesn't.
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If a reaction occurs, what will be the products of the unbalanced reaction
below
Cu(s) + Ni(NO3)2(aq) ➡️
A. CuNi(NO3)4(s)
B. No reaction will occur.
C. CuNi(s) + NO2(g)
D. Ni(s) + Cu(NO3)2(aq)
Answer:
B
Explanation:
Copper is lower on the activity series, so it can't replace nickel in this reaction. Therefore, no reaction will occur.
Which of the following is NOT a function of the skeletal system?
A. Exchanges oxygen and carbon dioxide
B. Produce red blood cells
C. Protects the organs
D. Stores calcium and phosphorus
(This is a science question btw)
Answer:
D. Stores calcium and phosphorus
Explanation:
Correct me if I'm wrong
Which
element does the electron configuration 1s?2s?2p? represent?
O B
O C
ON
O K
Sn=0.14 (E)
Sn+2 = -0.15(E)
Which form of tin is the stronger reducing agent? OS O Sn +2?
0.14
Explanation:
I just needed to finish setting up my account
What is the mass of one atom of nickel?
Answer:
58.6934
Explanation:
periodic table
Answer:
58.6934 u
Explanation:
You can find this from the atomic mass number on a Periodic Table, Nickel is 58.6934, therefore the mass of one atom of nickel is 58.6934 u.
List earth and the gas giant planets from the hottest to the coldest planet
Answer:
1. Venus
471°C
2. Mercury
(430°C) during the day, (-180°C) at night
3. Earth
16°C
4. Mars
-28°C
5. Jupiter
-108°C
6. Saturn
-138°C
7. Uranus
-195°C
8. Neptune
-201°C
Explanation:
.
Giving brainliest, please HELP!
Answer:
exothermic
Explanation:
Diagrams shows reactants.....add a little energy to get the reaction going
then energy is released and the final product has less energy ....so energy was released (heat) so this would be an exothermic reaction
Radium decays to form radon. 226 88 ra → 222 86 rn 4 2 he this type of nuclear decay is called .
Answer:
alpha decay
Explanation:
Nuclear reactions accompany nuclear decay and this type of decay is alpha decay.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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explain how electronegativity plays a role in the strength of intermolecular forces
Answer:
Intermolecular Forces: Review. Electronegativity is a measure of an atom's ability to attract the shared electrons of a covalent bond to itself. If atoms bonded together have the same electronegativity, the shared electrons will be equally shared.
Explanation:
hope this helped
Some contaminants enter the water from commercial farming, while other problems are an indirect result of these contaminants. Which
water problem is an indirect result of contaminants from commercial farming?
A. fertilizers
B. herbicides
C. algae
D. pesticides
The indirect result of contaminants from commercial farming is algae.
What is Contaminant?Contaminant is a substance either chemical, physical that is very toxic or harmful to living organisms, when it is released into air, water, soil or food.
Contaminant are poisionus substance that are not deliberately or are deliberately introduced to space . This contaminants make things impure and they are highly poisionus.
Therefore, The indirect result of contaminants from commercial farming is algae.
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How much oxygen does an average 50 year-old tree produce?.
Answer:
A mature leafy tree produces as much oxygen in a season as 10 people inhale in a year." "A 100-foot tree, 18 inches diameter at its base, produces 6,000 pounds of oxygen." "On average, one tree produces nearly 260 pounds of oxygen each year. Two mature trees can provide enough oxygen for a family of four.
Explanation:
hope this helps
3. Briefly discuss the results of the TLC. Was there evidence of unreacted p-nitrobenzaldehyde in either product
TLC means Thin Layer Chromatography. It is a method that can best be described as "Affinity-Based" used in the separation of compounds that are in a mixture.
What is unreacted p-nitrobenzaldehyde?Unreacted p-nitrobenzaldehyde is simply an organic aromatic compound that contains a nitro group para-substituted to an aldehyde. in this case, if it is unreacted, that means it is the same as before the chemical reation.
Note that the question is missing key information hence the general answer.
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Answer the following questions…
1. A solution contains 4.5x10-3 M HCl. Determine the following…
a. [H3O+]
b. [OH-]
c. pH
2. A Ca(OH)2 solution ahs a pH of 8.0. Determine the following for the solution…
a. [H3O+]
b. [OH-]
c. [Ca(OH)2]
The concentration of the hydronium ion in hydrochloric acid is 0.0045 M, and the pH of the solution is 2.34.
What is pH?pH is the potential of the hydrogen or the hydronium ions in the aqueous solution.
As the solution contains [tex]4.5 \times 10^{-3} \;\rm M\;[/tex] HCl the concentration of the hydronium ion will be the same, [tex]4.5 \times 10^{-3} \;\rm M.[/tex]
The pH of the solution is calculated as:
[tex]\begin{aligned} \rm pH &= \rm -log[H^{+}]\\\\&= - \rm log (4.5 \times 10^{-3})\\\\&= 2.34\end{aligned}[/tex]
The concentration of the hydroxide ion is calculated from pH and hydronium ion as:
[tex]\begin{aligned} \rm [H_{3}O^{+}][OH^{-}] &= 10^{-14}\\\\&= \dfrac{1 \times 10^{-14}}{4.5 \times 10^{-3}}\\\\&= 2.2 \times 10^{12}\end{aligned}[/tex]
Now, for the calcium hydroxide solution, the calculations are shown as,
[tex]\begin{aligned} \rm (H_3}\rm O^{+}) &= \rm antilog (-pH)\\\\&= \rm antilog (-8)\\\\&= 10^{-8} \;\rm M\end{aligned}[/tex]
pOH is calculated as:
[tex]\begin{aligned} \rm pOH &= 14- 8 = 6\\\\\rm [OH^{-}] &= \rm antilog (-6)\\\\&= 10^{-6} \end{aligned}[/tex]
The concentration of calcium hydroxide is calculated as:
[tex]\begin{aligned} &= \dfrac{1}{2} \times \rm [OH^{-}]\\\\&= 5 \times 10^{-4} \;\rm M\end{aligned}[/tex]
Therefore, the pH and the pOH give the concentration of the hydrogen or the hydronium ion and the hydroxide ion.
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If a spoon of copper metal is placed in a solution of ferrous sulfate:
A. Iron will precipitate out
B. Copper will precipitate out
C. Copper and iron will precipitate
D. No reaction will take place
If a spoon of copper metal is placed in a solution of ferrous sulfate then no reaction will take place.
What is electrochemical series?Electrochemical series of metals is the series which gives idea about the reactivity of the metals if present in any solution of another metal.
Iron metal is placed at the top position with respect to the copper metal, means iron is more reactive than copper. So when a spoon of copper metal is placed in a solution of ferrous sulfate, copper will not able to displace the iron metals from its solution.
Hence no reaction will occur.
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Describe how a metal less reactive than carbon can be reduced from its ore
Answer:
If a metal is less reactive than carbon, it can be extracted from its oxide by heating with carbon. The carbon displaces the metal from the compound, and removes the oxygen from the oxide. This leaves the metal.
PLEASE HELP: You have been given 2.42 moles of beryllium sulfide (BeS), determine the mass in grams of beryllium sulfide that you have.
The mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS
Calculating mass of a compoundFrom the question, we are to determine the mass of the given beryllium sulfide.
From the given information,
Number of moles of beryllium sulfide (BeS) given = 2.42 moles
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of BeS = 41 g/mol
Then,
Mass of BeS = 2.42 × 41
Mass of BeS = 99.22
Mass of BeS ≅ 99.2 g
Hence, the mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS
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Lithium arsenate (Li3AsO4) and iron nitrate (Fe(NO3)3) are dissolved in water. What precipitate would be expected to form.
Then double displacement will happen
The reaction given by
[tex]\\ \rm\Rrightarrow Li_3AsO_4+Fe(NO_3)_3\longrightarrow LiNO_3+FeAsO_4[/tex]
Remember that nitrate ions and compounds are highly soluble in water like HNO_3 ,KNO_3.
So LiNO_3 remains dissolved in water or aqueous.
FeAsO_4 will be in solute form i.e precipitate
What is a physical property?
O a characteristic of a substance that cannot be measured but can be observed
O a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
O a characteristic of a substance that cannot be measured or observed by conventional means
O a characteristic of a substance that can be measured or observed only by changing the chemical identity of the substance
Answer:
B. a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
Explanation:
The definition of a physical property is " a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change."
The only choice that matches this description fully is the second one, or B, so that is the answer.
hope this helps!
Write the steps that describe the process of water changing from a solid to a liquid, and from a liquid to a gas. Helpp plsss
4. If I have 7.7 moles of gas at a pressure of 0.090 atm and at a temperature of 56 °C, what is the volume of the container that the
gas is in?
Answer:
[tex]2.31*10^3 L[/tex] of gas are in the container.
Explanation:
1. First, convert temperature to kelvins. Otherwise, you will get the wrong answer. T = 56 + 273.15 = 329.15 K.
2.Use the ideal gas law. [tex]PV = nRT[/tex]
3.Re-arrange for volume and use the gas contstant R = [tex]\frac{0.082(L*atm)}{K*mol}[/tex]
4.Insert values. [tex]PV = nRT = \frac{(7.7 moles)(0.082 L*atm/(K*mol))(329.15K)}{(0.090 atm)} = 2.31*10^3 L.[/tex]
what is biological function?
Answer:
Biological Functions: processes and structures by which organisms adjust to short-term or long-term changes in their environment
Summarize how the structure of organic compounds allows them to function as pigments in 2 – 3 sentences
The structure of organic compounds allows them to function as pigments through chromophore and acid or basic groups.
What is a Pigment?This is defined as a colored substance which is completely or nearly insoluble in water.
The structure of organic compounds allows them to function as pigments include chromophore and the acid or basic groups such as OH, SO3H, etc.
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Giving BRAINLIEST, please HELP!
Answer:
measure the final temperature of water
why NaCl, when dissolved in water, is an electrolyte.
Answer:
Thus is because of the it ionic nature of compound the when NaCl is dissolve in the water the Na and CL ions are free to move in the solution because of this they can conduct electricity and serves as an electrolyte
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE2. Which of the following best describes temperature? *
O Number of molecules
Motion of molecules
O Size of molecules
O Type of molecules
Answer:
motion of molecules because we gonna see which one is in a solid state and what's so ever
Which of the following are functions of the nose?
I. Filters the air before it goes to the lungs.
II. Helps us keep our balance
III. Helps us smell different odors.
I and II
I and III
II and III
I, II, and III
Answer:
The answer should be I and III
Answer:
| and |||
Explanation:
1500 torr is how many kPa
Answer:
200 kPa
(it is actually 199.999, but rounding up it is 200)
hope this helps!
Answer:
1500 Torr is about 200 kPa
How many chlorine atoms are on the products side of the reaction 2al 6hcl → 2alcl3 3h2? 2 3 6 9
The number of chlorine atoms present on the product side of the reaction is 6
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to determine the number of atoms of Cl2Al + 6HCl → 2AlCl₃ + 3H₂
Products => AlCl₃ and H₂
Number of Cl atoms = 2 × 3
Number of Cl atoms = 6 atoms
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Answer: 3. 6
Explanation: To put it simply