Name and Describe two properties of water that’s important to life on earth
"The Univeral Solvent"
- Water is known to be the universal solvent because of its ability to dissolve more particles than any other liquid.
Cohesion- Cohesion is the property of water to attract other molecules. This helps in making solutions that are essential for most life to propagate.
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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.
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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:
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Explain the difference between current electricity and magnetism.
During the degradation of many amino acids, the first step involves transfer of the amino group to which citric acid cycle intermediate?.
what is a radical in chemistry
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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Please help
AB+C<— A+CB
—>
Question 1: Imagine that the reaction starts with 100 molecules of reactants and zero molecules of products. Explain why the amount of reactants will never reach zero.
Question 2: imagine that the reaction starts with 0 molecules of reactants and 100 molecules of products. Will the amount of products increase or decrease as the reaction proceeds? Explain.
The rate of forward reaction equal to the rate of reverse reaction hence the amount of reactants will never reach zero.
Chemical reactionA chemical reaction involves the combnation of two or more species to yiled products. We must know that a point is always reached in a reaction when the rate of forward reaction equal to the rate of reverse reaction hence the amount of reactants will never reach zero.
Also, if the reaction starts with 0 molecules of reactants and 100 molecules of products, the amount of products will decrease overtime.
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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
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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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
all in a day's work cryptogram
Answer:
yup!
Explanation:
i dont know what else to say.
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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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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Is iron conducting electricity a physical, or chemical change?
Answer:
Its a chemical conducting electricity
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.
WE DO: The mechanism shown here is proposed for the reaction:
2A → 2B + C
2A k1↔ B + D (Fast, equilibrium)
B + D k-1→ E + C (Slow)
E → 2B (Fast)
Propose a rate law consistent with the mechanism.
Please show and explain everything.
Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is [tex]B+D \rightarrow ^{k_{-1}} E+C[/tex].
What is the rate law?Rate law can be defined as a chemical equation that is used to relate the initial (forward) chemical reaction rate with respect to the concentrations of both the chemical reactants and constant parameters.
Mathematically, the rate law is given by this formula:
[tex]R = K[A]^x[B]^y[C]^z[/tex]
Where:
k is the rate constant.A is the concentration of reactant A.B is the concentration of reactant B.C is the concentration of reactant C.x, y, and z are the order of the reaction.Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is as follows:
[tex]B+D \rightarrow ^{k_{-1}} E+C[/tex]
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19.5 g of NaCl occupy a volume of 29.5 mL. What is the molarity of the solution?
Round your answer to 1 decimal space, even if sig figs are not conserved.
(Please answer quickly)
Answer:
11.3 M
Explanation:
Na = 22.989 gm/mole
Cl = 35.45 gm/mole so Na Cl = 58.439 gm/mole
(19.5 / 58.439 )/ (29.5/1000) = 11.3 M
A balanced chemical equation for the decomposition of hydrogen peroxide is:
2H2O2 + 2H2O + O2.
True or false
Answer:
true
Explanation:
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.
Gene therapy is a form of
.
what are the hydrogen ion and hydroxide ion concentrations in water? what is the pH and pOH of pure water?
Answer:
The pH of pure water is 7, the negative logarithm of 1 X 10-7. A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.
Explanation:
The hydrogen ion concentration equals the hydroxide ion concentration, and both equal to [tex]1 X 10^{-7}[/tex] M. Hence, in a neutral solution, then, pH = pOH = 7.
What is pH?pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.
pOH is calculated by taking negative logarithm of hydroxide ion concentration.
The pH of pure water is 7, the negative logarithm of [tex]1 X 10^{-7}.[/tex]
A neutral solution is one that is neither acidic nor basic.
The hydrogen ion concentration equals the hydroxide ion concentration, and both are equal to [tex]1 X 10^{-7}[/tex] M.
Hence, in a neutral solution, then, pH = pOH = 7.
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A person sitting in a rolling chair at rest throws a basketball forward. Since the person and the rolling chair have a greater mass than the basketball, how will the person and the rolling chair respond?
They will have the same forward momentum as the basketball.
They will move backward at a lower speed than the basketball moves forward.
They will move backward at a higher speed than the basketball moves forward.
They will travel the same distance as the basketball travels but in the opposite direction
They will move backward at a lower speed than the basketball moves forward.
Conservation of linear momentumThe principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.
Initial momentum = Final momentum
The forward momentum of the basketball = Backward momentum of the person and the chair
Since the mass of the person and the chair is greater than the mass of the basketball, the person and the rolling chair will move backward at a lower speed than the basketball moves forward.
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Determine the ph of a 0. 188 m nh3 solution at 25°c. The kb of nh3 is 1. 76 × 10-5.
[tex]\tt [OH^-]=\sqrt{Kb.M}[/tex]
[OH⁻]=√1.76.10⁻⁵.0.188
[OH⁻]=1.81 x 10⁻³
pOH = 3 - log 1.81
pH = 11 + log 1.81
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.
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
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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.
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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please answer thank tou
Answer:
ion
Explanation:
more protons than electrons
What happens when a dendritic cell detects a pathogen?
the dendritic cell will cause agglutination of the pathogen cells
the dendritic cell consumes the pathogen by phagocytosis...
the dendritic cell secretes antibodies
the dendritic cell will produce immunoglobin
Answer:
the dendritic cell consumes the pathogen by phagocytosis