Answer:
Negative feedback caused his pancreas to stop secreting insulin.
Explanation:
i took the test its correct
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:
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What is the molarity of an NaOH solution if 20. Milliliters of 2. 0 M HCl is required to exactly neutralize 10. Milliliters of the NaOH solution?
1.
1. 0 M
2.
2. 0 M
3.
0. 50 M
4
4. 0 M
Answer: 4
Explanation:
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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What is the difference between a strong alkali and a weak alkali?
Answer:
Strong Alkali – Is an alkali which dissociates – almost completely in aqueous solution thereby producing a – high concentration of hydroxyl [OH– ] ions.
Weak alkali – Is an alkali which dissociates – only partially in aqueous solution thereby producing a – low concentration of hydroxyl [OH–] ions.
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.
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
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.
Before the 1800s the europeans especially wanted to trade for in africa
Europeans wanted to trade things for rubber and oil with Africa
Determine if the following are examples of Elements, Compounds, or Mixtures
Air
Answer:
Mixture
Explanation:
Air is a mixture, meaning it can be separated into its components without a chemical reaction taking place. In this case, it is a mixture of gases.
how many atoms are in 6.5 moles of zinc
Answer:
many atoms are in 6.5 moles of zinc? 6.5 moles. 6.02 x 10. 23 atoms =.
3 pages
Explanation:
The number of atoms in the 6.5 moles of zinc is equal to 39.15 × 10²³ atoms of zinc.
What is a mole?A mole is a scientific unit that is used to measure a large number of quantities of molecules, ions, atoms, or other particular particles. The number of particles or atoms in a mole is the same for almost all substances.
The number of entities present in one mole was experimentally found to be equal to 6.023 × 10 ²³, which is a constant. This number is termed as Avogadro’s number or Avogadro’s constant.
Given, the number of moles of zinc = 6.5 moles
The number of atoms of zinc in one mole = 6.023 × 10 ²³
Then 6.5 moles of zinc will have atoms of zinc = 6.023 × 10 ²³ × 6.5
= 39.15 × 10 ²³ atoms.
Therefore, the 39.15 × 10 ²³ Zinc atoms are in 6.5 moles of zinc.
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Balance the equation hbr + khco3 > h2o + kbr + co2
Answer:
It is already balanced
Explanation:
hbr + khco3 ===> h20 + kbr + co2 IS BALANCED
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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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:
.
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
Giving BRAINLIEST, please HELP!
Answer:
measure the final temperature of water
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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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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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!
Which
element does the electron configuration 1s?2s?2p? represent?
O B
O C
ON
O K
Interpret the following balanced chemical equations in terms of particles, moles, and mass.
Show that the law of conservation of mass is observed.
a. N2(g) + 3H2(g) - 2NH3(g)
b. HCI(aq) + KOH(aq) - KCI(aq) + H-O0
C. 2Mg(s) + 02(g) - 2MgO(s)
The equations obey the law of conservation of mass in that the number of moles of each component atom is balanced on both sides.
Law of conservation of massIt states that mass is conserved during chemical reactions.
For the first equation: [tex]N_2(g) + 3H_2(g) --- > 2NH_3(g)[/tex], there are 2 nitrogen and 6 hydrogen atoms on the reactant and product's side respectively. Thus, the number of atoms is conserved.
For the second equation: [tex]HCI(aq) + KOH(aq) -- > KCI(aq) + H_2O (l)[/tex], there are an equal number of H, Cl, K, and O atoms at the reactant and product's sides. The number of atoms is also conserved.
Lastly in the equation: [tex]2Mg(s) + O_2(g) - 2MgO(s)[/tex], the number of each atom is also balanced on both sides.
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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:
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Giving brainliest, please HELP!
Answer:
D = melting and vaporization
Explanation:
Pretend this is very cold ICE
A heat the ice up to melting point
B melt the ice to waterheat the water to boiling
D change water to steam
E heat the steam up (superheat the steam)
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
why are some voltaic cells called dry cells even though their chemistry involves water
Some voltaic cells are called dry because they do not have liquids in them.
Dry voltaic cellsThey are called dry because their electrolytes are usually in paste forms instead of aqueous form in which the electrolytes of wet cells are usually are.
The pastes in dry cells are made moist enough for the electric current to be able to flow through them.
Dry cells are advantageous because they are less heavy and one does not have to worry about the electrolyte spilling, unlike wet cells.
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what is biological function?
Answer:
Biological Functions: processes and structures by which organisms adjust to short-term or long-term changes in their environment
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
A radioactive isotope has an activity of 9.60 mCi. After 3.75 hours the activity is 7.39 mCi. What is the half-life of the isotope
For a radioactive isotope has an activity of 9.60 mCi. , the half-life of the isotope is mathematically given as
t0.5 = 23893 s
What is the half-life of the isotope?Generally, the equation for the half-life is mathematically given as
t0.5=T*0.693
Where
A = A0 e^(-t/T)
t/T = lnA0/A
3.75 hours/T=ln 9.60/7.39
T = 34478.5 s
Therefore
t1/2 = TX0.693
t0.5 = 23893 s
In conclusion, the half life
t0.5 = 23893 s
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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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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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