c. A sulfide ion has 2- charge because it gaines two electrons
thia statement is true.
Freddie is carrying out an experiment for which he has to maintain a water bath at a temperature of 37°C. He has a choice of four thermometers, all of which read from 0 to 100°C.Thermometer A is marked in 5°C intervals, B in 1°C intervals, C in 10°C intervals and D in 20°C intervals. Which thermometer should Freddie choose to monitor the water bath's temperature?
B
D
A
C
Answer:
C
Explanation:
because 37 does not end with 5 or 0, so it'd be harder to see if the water temperature is accurate if your thermometer goes up by 5s or 10s. And using D, the one that goes up by 20s is out of the question, it'd be too difficult to read. Using a thermometer that goes up by 1s is just best because you can be positive when the water is at 37°C
Which of the following statements is true of these two cells?
A.
Nerve cells do not look like skin cells because they make up different organs and have different functions.
B.
Nerve cells do not look like skin cells because they contain completely different DNA within the same organism.
C.
Nerve cells and skin cells are identical to one another in appearance and function.
D.
Nerve cells and skin cells appear different from each other, but they have identical functions.
The true statements is that nerve cells do not look like skin cells because they make up different organs and have different functions.
What are cells?Cells are the basic functional and fundamental unit of any living organism.
Each and every cells that are present inside the body have same DNA, but they all have different function and different structures. As nerve cells are present only in the brain and spinal cord part and skin cells are present all over the body.
Hence both the cells are different as they have different functions.
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During the degradation of many amino acids, the first step involves transfer of the amino group to which citric acid cycle intermediate?.
Automobile catalytic Converters use a platinum callus to reduce air pollution by changing emissions such as carbon monoxide CO2 to carbon dioxide CO2 the uncatalyzed reaction is represented by the balance inflation below 2 CO + 02 2CO2 + heat determine the number of moles of O2 reaction with 28 moles of CO during this reaction
Answer:
14 mol O₂
Explanation:
The reaction between CO and O₂ is the following:
CO + O₂ → CO₂
We balance the equation with a coefficient 2 in CO and CO₂ to obtain the same number of O atoms:
2CO + O₂ → 2CO₂
As we can see from the balanced equation, 1 mol of O₂ is required to react with 2 moles of CO. Thus, the conversion factor is 1 mol of O₂/2 mol CO. We multiply the moles of CO by the conversion factor to calculate the moles of O₂ that are required:
28 mol CO x 1 mol of O₂/2 mol CO = 14 mol O₂
what is a radical in chemistry
Why do gases behave the least like ideal gases at low temperatures in high pressures
Answer: the interactions that are going on with the intermolecular. And depending how much space their is between each particle.
Explanation: Gases behave the least like ideal gases at low temperatures in high pressures because of the interactions that are going on with the intermolecular. And depending how much space their is between each particle. And whether the sizes are compared to small or large spaces are really insignificant.
Hope this helps :)
Gene therapy is a form of
.
Mass number is the number of?
Answer:
mass is the amount of matter in an object
Explanation:
What you prefer cat or dog or pig?
Answer:
dog
Explanation:
cats hide and break stuff pigs will probally stay outside all day and i ove dogs
I prefer a pig
Benefits of having a pig
- you can eat them
- they taste good
- they have bacon
- Richard
- they are good to eat
- they taste very good because of the bacon
- you can cook them
- they are good cooked
At what age did Lavoisier die?
Answer:
50 years old
Explanation:
Antoine Lavoisier died by the guillotine at the age of 50 on May 8, 1794 in Paris.
Hope this helps...
- profparis
Answer:
Antoine Lavoisier died at the age of 50
Is iron conducting electricity a physical, or chemical change?
Answer:
Its a chemical conducting electricity
please answer thank tou
Answer:
ion
Explanation:
more protons than electrons
9. In a neutralization reaction, an acid and a base react to produce a an oxide and water.
true/false
Answer and Explanation: The answer is false.
Answer the amount of miles of O2
Answer:
3
Explanation:
the answer is 3 because it is 3 for the o2 so 3 you have to pay more attention for the small ditails
Denzel has a flask containing a mixture of rocks, soil, iron filings and salt. He needs to separate the four components of the mixture. Create a method to successfully separate each of the components of the mixture. HINT: use their physical and/or chemical properties.
Answer:
Sift the mixture to separate the rock from the iron filings, soil and salt.
You can then use a magnet to separate the iron filings from the salt and soil.
Afterwards, you can pour water into the remaining salt- soil mixture. Salt will dissolve but the soil will remain at the bottom of the water.
If you want to separate the salt from the water, you can boil it till all the water evaporates. The only thing that'd be left in the pan is salt.
How many grams are there in 3.4 x 10^24 molecules of NH3?
Answer:
95.965 grams
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of NH₃, then 3.4×10²⁴ molecules are contained in how many moles of NH₃?
amount of moles of NH₃= (3.4×10²⁴ atoms × 1 mole)÷ 6.023×10²³ atoms
amount of moles of NH₃= 5.645 moles
Being the molar mass of NH₃, that is, the amount of mass that a substance contains in one mole, 17 , then the amount of mass that 5.645 moles of the compound contain can be calculated as:
5.645 moles× 17= 95.965 grams
Finally, 95.965 grams of NH₃ are in 3.4×10²⁴ molecules of NH₃.
1. A sulfur atom has 16 protons, 18 neutrons, and 16
electrons. A sulfide ion has a 2– charge. Which of
the following is the correct number of particles that
make up a sulfide ion?
a. 18 protons, 18 neutrons, and 16 elections
b. 16 protons, 18 neutrons, and 18 electrons
c. 18 protons, 16 neutrons, and 16 electronis
d. 14 protons, 18 neutrons, and 16 electrons
e. 15 protons, 17 neutrons, and 17 electronis
Answer:
b. 16 protons, 18 neutrons, and 18 electrons
Explanation:
Things to be remembered
Negative charge on any ionic species indicates gained the electrons
Positive charge on any ionic species indicates lost the electrons
A sulfur atom has 16 protons, 18 neutrons, and 16 electrons, A sulfide ion has a 2– charge which indicates that sulphur has gained two electron from any other atom, ion or species!
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The complement system of defense is composed of proteins that are always present in the blood. Which statement describes the importance of this system in early pathogen defense?
It recognizes specific common pathogens.
It rapidly lower the blood pH.
It causes immediate pathogen lysis.
It does not have to be activated by antibodies.
Answer:
The answer is It recognizes specific common pathogens. :)
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An ion has a charge of +3 and has 51 electrons. How many protons does it have?
Answer:
54 protons
Explanation:
51 electrons 'balance' the charge of 51 protons....but there is three more PLUS charges ......means three more protons
51 + 3 = 54
PLEASE HELP ASAP
What does it mean that the collisions between gas particles are elastic?
Answer:
There is no net loss of energy from the collisions.
Explanation:
Gas particles are constantly colliding with each other and the walls of their container. These collisions are elastic; that is, there is no net loss of energy from the collisions. Gas particles are small and the total volume occupied by gas molecules is negligible relative to the total volume of their container.
A balanced chemical equation for the decomposition of hydrogen peroxide is:
2H2O2 + 2H2O + O2.
True or false
Answer:
true
Explanation:
he narrator says that the story of the universe is the story of the transformation of energy from one form to another. What do you think he means?
Answer:
the narrator means that before the universe was out forward to completion,
there were little things that came together to form other things
a typical example can be found in the big bang theory
Answer:The narrator is pointing out that energy is involved in every event, and each event can be described in terms of energy.
Explanation:
Identify the products of this single-replacement reaction between sulfuric acid and aluminum. Then balance the equation. (2 points)
___H₂SO₄ + ___Al → ___ + ___
The products of this reaction between aluminum and sulfuric acid are two: hydrogen and aluminum sulfate.
What are the products in a reaction?This concept refers to the substances obtained at the end of the reaction.
What does it mean to balance an equation?It means to make sure there are the same molecules in the reactants and products.
What are the products in this reaction?Al + H2SO4 = Al2 (SO4)3 + H2 Al2 (SO4)3 = Aluminium sulfateH = HydrogenWhat is the balanced equation?2Al + 3H2SO4 = Al2 (SO4)3 + 3H2
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Draw the lewis structure of sf2, showing all lone pairs.
Answer:
Number of valence electrons in two F atom = 2(7) = 14
Total number of valence electrons = 6 + 14 = 20 electrons
Placing a bonding pair of electrons between the atoms to form the chemical bonds.
Electrons used in bonding = 4
The remaining electrons are used as a lone pair for central or terminal atoms to achieve an octet to finish the Lewis dot structure.
Electrons used as a lone pair = 20 - 4 = 16
Explanation:
hope this helps
NaOH was adde to a 7.75 x 10^-3 M solution of HCl so that the end solution has a pH of 3.500. What is the positive difference in concentration of [H3O+]
Answer:
concentration [H_3O^+][H3O+] decreased by 4.46334\sdot10^{-4}M.4.46334⋅10−4M.
Explanation:
pH=−log[H3O+]; [H_3O^+]=10^{-pH};[H3O+]=10−pH;
If pH=3.350;pH=3.350;
[H_3O^+]=10^{-3.35}=4.467\sdot10^{-4}M;[H3O+]=10−3.35=4.467⋅10−4M;
If pH=6.780;pH=6.780;
[H_3O^+]=10^{-6.78}=1.66\sdot10^{-7}M;[H3O+]=10−6.78=1.66⋅10−7M;
4.467\sdot10^{-4}-1.66\sdot10^{-7}=4467\sdot10^{-7}-1.66\sdot10^{-7}=4465.34\sdot10^{-7}=4.467⋅10−4−1.66⋅10−7=4467⋅10−7−1.66⋅10−7=4465.34⋅10−7=
=4.46534\sdot10^{-4}M;=4.46534⋅10−4M;
The positive difference in concentration of [[tex]H_3O^+[/tex]] is [tex]4.46534 X 10^{-4}M[/tex] when NaOH was added to a 7.75 x [tex]10^-3[/tex] M solution of HCl so that the end solution has a pH of 3.500.
What is concentration?It is the measure of how much of a given substance there is mixed with another substance.
pH=−log[[tex]H_3O^+[/tex]]
[[tex]H_3O^+[/tex]]=[tex]10^{-pH}[/tex]
[[tex]H_3O^+[/tex]]=[tex]10^-^p^H[/tex]
If pH=3.350
pH=3.350
[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]=[tex]4.467 X 10^{-4}M[/tex]
[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]
=[tex]4.467 X 10^{-4}M[/tex]
If pH=6.780
pH=6.780
[[tex]H_3O^+[/tex]]= [tex]10^{-6.78}[/tex]=[tex]1.66 X 10^{-7}M[/tex]
Hence, the positive difference in concentration of [[tex]H_3O^+[/tex]] is[tex]= 4.46534 X 10^{-4}M[/tex]
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When a liquid is heated, the average (blank) energy of its
particles will increase.
Answer:
trueee is the answer heh need points
When a liquid is heated, the average kinetic energy of its particles will increase.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
Average kinetic energy = 3KT/2
If temperature increases, kinetic energy also increases.
Therefore, When a liquid is heated, the average kinetic energy of its particles will increase.
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A scientist produces zinc iodide (zni2). (a) calculate the minimum mass of zinc that needs to be added to 0.500 g of iodine so that the iodine fully reacts. the equation for the reaction is: zn + i2 ⟶ zni2 relative atomic masses (mr): zn = 65 i = 127
The minimum mass of Zinc, Zn that needs to be added to 0.500 g of iodine so that the iodine fully reacts is 0.128 g
Balanced equationZn + I₂ —> ZnI₂
Molar mass of Zn = 65 g/mol
Mass of Zn from the balanced equation = 1 × 65 = 65 g
Molar mass of I₂ = 127 × 2 = 254 g/mol
Mass of I₂ from the balanced equation = 1 254 = 254 g
SUMMARY
From the balanced equation above,
254 g of I₂ required 65 g of Zn
How to determine the mass of Zn neededFrom the balanced equation above,
254 g of I₂ required 65 g of Zn
Therefore,
0.5 g of I₂ will require = (0.5 × 65) / 254 = 0.128 g of Zn
Thus, the minimum mass of Zn required is 0.128 g
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What is the mode of action of most antifungal drugs?
inhibition of protein synthesis.
disruption of membranes.
inhibition of RNA synthesis.
destruction of chitin
inhibition of folic acid precursor synthesis
Inhibition of protein synthesis is the mode of action done by most antifungal drugs.
What is the mode of action of antifungal drugs?Antifungals drugs inhibit the synthesis of ergosterol the main fungal sterol, polyenes which interact with fungal membrane sterols and 5-fluorocytosine inhibits macromolecular synthesis.
So we can conclude that inhibition of protein synthesis is the mode of action done by most antifungal drugs.
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What is the molar mass of a 3.228 g sample of a gas if it occupies 3.21 L at 298 K and 1.25 atm?
Taking into account the ideal gas law and the definition of molar mass, the molar mass of a 3.228 g sample of a gas if it occupies 3.21 L at 298 K and 1.25 atm is 19.66 [tex]\frac{g}{moles}[/tex].
What is ideal gas lawAn ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Number of moles in this caseIn this case, you know:
P= 1.25 atmV= 3.21 Ln= ?R= 0.082 [tex]\frac{atmL}{mol K}[/tex]T= 298 KReplacing in the ideal gas law:
1.25 atm× 3.21 L = n× 0.082 [tex]\frac{atmL}{mol K}[/tex]× 298 K
Solving:
n= (1.25 atm× 3.21 L)÷ (0.082 [tex]\frac{atmL}{mol K}[/tex]× 298 K)
n= 0.1642 moles
So, the number of moles in this case are 0.1642 moles.
Molar mass of the sampleIn this case, you know:
mass= 3.228 gnumber of moles= 0.1642 molesThen, considering the definition of molar mass, it is calculated as:
[tex]molar mass=\frac{3.228 g}{0.1642 moles}[/tex]
Solving:
molar mass= 19.66[tex]\frac{g}{moles}[/tex]
Finally, the molar mass of a 3.228 g sample of a gas if it occupies 3.21 L at 298 K and 1.25 atm is 19.66 [tex]\frac{g}{moles}[/tex].
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Please write an explanation if you find the answer, I don't get it.
A flask contains 21.8 g of chlorine gas and 47.8 g of sulfur dioxide gas. What is the mole fraction of the sulfur dioxide?
Round your answer to 3 decimal spaces, even if sig figs are not conserved.
The mole fraction of the sulfur dioxide gas present in a falsk which contains 21.8 g of chlorine gas and 47.8 g of sulfur dioxide gas is 0.708.
How do we calculate mole fraction?Mole fraction of any substance will be calculated by dividing the moles of desired substance by the total moles of the species present in that sample.
Moles can be calculated as:
n = W/M, where
W = given mass
M = molar mass
Moles of 21.8g of chlorine gas = 21.8g / 71g/mol = 0.307mol
Moles of 47.8g of sulphur dioxide gas = 47.8g / 64g/mol = 0.746mol
Mole fraction of sulphur dioxide gas = 0.746 / 0.746+0.307 = 0.708
Hence required mole fraction of sulphur dioxide gas is 0.708.
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