Answer:
The correct answer is - 4 m/s
Explanation:
Given:
time = 20 sec
velocity= 80 m/s
Accelaration = ?
Solution:
formula for the accelaration can be drive from the for
vi = vf + ( a.t)
0 m/s (rest) = 80 m/s + (a.20s.-1)
a.20.-1= -80,
we check if this is true;
0 m/s= 80 + -80 = 0 so its true.
so a.20.-1= -80,
a= 80/20 ,
Thus, the correct answers a = 4 m/s
When temperature drops, (for example from 20 degrees celsius to 10 degrees celsius)
a.) energy increases
b.) particles move slower
c.) particles collide more often
d.) pressure increases
Answer:
In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.
In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.
That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.
Conclusion: 20 degree change represents a larger change in Celsius scale.
Explanation:
In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.
In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.
That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.
Conclusion: 20 degree change represents a larger change in Celsius scale.
What does the electrostatic force do inside the nucleus?
A. It adds to the strong nuclear force.
B. It holds the protons and neutrons together. C. It causes the protons to repel each other.
D. It cancels out the strong nuclear force
Answer:
C. it causes the protons to repel each other.
A gas occupies a volume of 2.50 L at a pressure of 350.0 kPa. If the temperature remains
constant, what volume would the gas occupy at 1750 kPa ?
1. 12.5 L
2. 5.00 L
3. 1.40e+2L
4. 0.500 L
Answer:
V₂ = 0.5 L
Explanation:
Given that,
Initial volume, V₁ = 2.5 L
Pressure, P₁ = 350 kPa
New pressure, P₂ = 1750 kPa
We need to find the new volume if the temperature remains constant. The mathematical relation between P and V is :
[tex]P\propto \dfrac{1}{V}\\\\or\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}[/tex]
Where
V₂ is new volume
So,
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{350\times 2.5}{1750}\\\\V_2=0.5\ L[/tex]
So, the new volume is equal to 0.5 L.
If you have 500 mL of a 0.10 M solution of the acid, what mass of the corresponding sodium salt of the conjugate base do you need to make the buffer with a pH of 7.74 (assuming no change in volume)
Answer:
5.90g of NaClO are needed
Explanation:
Assuming the weak acid is HClO pKa = 7.54
To solve this question we must use the H-H equation for acids:
pH = pKa + log [A-] / [HA]
Where pH is the pH we want = 7.74
pKa is pKa of the weak acid = 7.54
[A-] could be taken as the moles of the conjugate base (Moles NaClO) and [HA] moles weak acid = 0.500L * (0.10mol/L) = 0.0500 moles HClO
Replacing:
7.74 = 7.54 + log [NaClO] / [0.0500 moles]
0.20 = log [NaClO] / [0.0500 moles]
1.5849 = [NaClO] / [0.0500 moles]
Moles NaClO = 0.0792 moles
The mass is: -Molar mass NaClO = 74.44g/mol-
0.0792 moles * (74.44g / 1mol) =
5.90g of NaClO are needed5.90g of NaClO mass of the sodium salt of the conjugate base are need to make the buffer with a pH of 7.74.
What is pH?pH tells the solution is acidic or basic. pH means potential hydrogen.
Given,
Assuming the weak acid is (hypochlorous acid) HClO
pKa = 7.54
[tex]pH = pKa + \dfrac{ log[A-] }{ [HA]}[/tex]
(Moles NaClO) and [HA] moles weak acid = 0.500L * (0.10mol/L) = 0.0500 moles HClO
Putting the value
[tex]7.74 = 7.54 + \dfrac{ log[NaClO] }{ [0.0500 moles]}\\0.20 =\dfrac{ log}{[0.0500 moles]} \\1.5849 =\dfrac{ [NaClO]}{Moles\;of\; NaClO } = 0.0792 moles[/tex]
The mass is
Molar mass NaClO
= 74.44g/mol - 0.0792 moles * (74.44g / 1mol)
=5.90g of NaClO are needed
Thus, 5.90g of NaClO are needed.
Learn more about pH, here:
https://brainly.com/question/15289741
How many moles of aluminum sulfide will be produced if 12 moles of Sg react?
Answer:
Molar mass = [9(12.0)+8(1.01)+4(16.0)] = 180.1 g/mol Moles = 112 g 1 mol x 180.1 g = 0.622 mol (3 sig figs)
Explanation:
The reaction of an acid and a base will always produce what kind of salt?
A.
a combination of the cation from the acid and the anion from the base
B.
a combination of the cation from a strong base and the anion from a weak acid
C.
neutral salts from the cation of a strong base and the anion from a weak acid
D.
basic salts from the cation of a strong base and a strong acid
E.
depends on the strength of the acid and the base
Explanation:
E maybe i am not sure or C
What is the smallest kind of volcano
Answer:
Cinder cones
Explanation:
Find the moles of 127.5g of NaCl.
Answer:
n = 2.18 moles
Explanation:
Given that,
Mass = 127.5g
Molar mass of NaCl = 58.44 g/mol
We need to find the number of moles. We know that,
No. of moles = Given mass/molar mass
Put all the values,
[tex]n=\dfrac{127.5\ g}{58.44\ g/mol}\\\\n=2.18\ moles[/tex]
Hence, there are 2.18 moles of 127.5g of NaCl.
The partial pressure of N2 in a mixture of gases, where the total pressure is 1.50 atm, is 300. torr. What is the mole fraction of N2
Answer:
The mole fraction of N₂ is 0.26.
Explanation:
The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:
PT = PA + PB
This relationship is due to the assumption that there are no attractive forces between the gases.
Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.
So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:
PA = XA * PT
In this case:
PA= PN₂= 300 torrXA=XN₂= ?PT= 1.50 atm= 1140 torr (being 1 atm= 760 torr)Replacing:
300 torr= XN₂*1140 torr
Solving:
[tex]X_{N_{2} } =\frac{300 torr}{1140 torr}[/tex]
XN₂= 0.26
The mole fraction of N₂ is 0.26.
A chloride ion, : Cl :i– , acts as a alternate base when it combines with
A. a OH– ion
B. a K+ ion
C. an H– ion
D. an H+ ion
Answer:
D
Explanation:
The answer is D...and if you need explanation you can comment
does neutrons have a positive charge
Answer:
neutrons have no charge
Answer:
No it doesnt
Explanation:
a. Use VSEPR to predict bond angles at the marked atom. The angle is : _______ degrees. The expected hybridization at the marked atom is _____ . b. Use VSEPR to predict bond angles at the marked atom. The angle is : _______ degrees. The expected hybridization at the marked atom is _____ .
Answer: Hello your question is incomplete attached below is the complete question with the missing diagrams
a) The angle = 120°
hybridization = sp2
b) The angle = 120°
hybridization = sp2
Explanation:
a) using VSPER to predict bond angles
Given that there is the presence of 1 double bond to C and 2 single bonds one to C and one to H around the marked atom which equals 3 sets of electrons surrounding the central atom.
hence according to VSPER theory the angle = 120° while the Hybridization = sp2
b) Using VSPER to predict bond angles at marked atom
Given that there is There is 1 double bond to C and 2 single bonds to the different C atoms respectively around the marked atom, which makes 3 sets of electorns surrounding the central atom
hence according to VSPER theory the angle = 120° while the Hybridization = sp2
If there are 10.00 moles of ascorbic acid(C6H8O6), what is the mass of ascorbic acid?
Given
no of moles = 10 mol
we know that mass of 1 mole ascorbic acid is 176.12,
mass id 10 mole of ascorbic acid = 10× 176.12
= 1761.2 g
Answer - 1761.2 grams
PLZ HELP... provide the correct coefficients to balance the chemical equation C2H6+O2 -> CO2 + H20
What volume of water would you add to 35.81 mL of 1.59 M acetic acid solution to make it a 0.97 M?
Answer: A volume of 58.69 mL of water would you add to 35.81 mL of 1.59 M acetic acid solution to make it a 0.97 M.
Explanation:
Given: [tex]V_{1}[/tex] = 35.81 mL, [tex]M_{1}[/tex] = 1.59 M
[tex]V_{2}[/tex] = ?, [tex]M_{2}[/tex] = 0.97 M
Formula used to calculate volume is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\1.59 M \times 35.81 mL = 0.97 M \times V_{2}\\V_{2} = 58.69 mL[/tex]
Thus, we can conclude that a volume of 58.69 mL of water would you add to 35.81 mL of 1.59 M acetic acid solution to make it a 0.97 M.
What are five different types of air pollutant each
True or False
a. The cones in our eyes detect color, while the rods perceive brightness.
b. In white light, white objects absorb all the colors.
c. At night, when light is dim, our cones are not activated so objects will appear as their normal color.
P.
d. Violet has the longest wavelength which is why it gets refracted the most.
V
e. The angle of incidence always equals the angle of reflection.
true
false
true
true
false
A piece of wood burns to form ash. ____C_____ Water evaporates into steam. ____P_____ A piece of cork is cut in half. ____P_____ A bicycle chain rusts. _____C______ Food is digested in the stomach. _____C______ Water is absorbed by a paper towel. _____P______ Hydrochloric Acid reacts with zinc. _____C______ A piece of an apple rots on the ground. ____C_____ A tire is inflated with air. ____P____ A Plant turns sunlight, CO2, and water into sugar and oxygen. ____C_____ Sugar dissolves in water. ____C_____ Eggs turn into an omelet. _____C______ Milk sours. _____C______ A popsicle melts. _____P_______ Turning brownie mix into brownies. _____C______
Answer:
A piece of wood burns to form ash - Chemical change
Water evaporates into steam - Physical change
A piece of cork is cut in half. __ Physical change
A bicycle chain rusts. _____Chemical change
Food is digested in the stomach. _____Chemical change
Water is absorbed by a paper towel. _____Physical change
Hydrochloric Acid reacts with zinc. _____Chemical change
A piece of an apple rots on the ground. ____Chemical change
A tire is inflated with air - Physical change
A Plant turns sunlight, CO2, and water into sugar and oxygen. _Chemical change
Sugar dissolves in water - Physical change
Eggs turn into an omelet. _____Chemical change
Milk sours. Chemical change
A popsicle melts. _____Physical change
Turning brownie mix into brownies. Chemical change
Explanation:
Matter undergoes two types of changes: physical changes and chemical changes.
A physical change is one that affects only the physical properties of a substance such as colour, size, shape, etc., and in which no new substances are formed. Physical changes are easily reversible.
Chemical changes are changes which affect the chemical characteristics and properties of a substance such as reactivity, acidity, basicity, etc., resulting in the formation of new substances.
The following changes below are categorized as either physical or chemical changes based on which of the properties of the substance is affected and whether new substances result or not.
A piece of wood burns to form ash - Chemical change
Water evaporates into steam - Physical change
A piece of cork is cut in half. __ Physical change
A bicycle chain rusts. _____Chemical change
Food is digested in the stomach. _____Chemical change
Water is absorbed by a paper towel. _____Physical change
Hydrochloric Acid reacts with zinc. _____Chemical change
A piece of an apple rots on the ground. ____Chemical change
A tire is inflated with air - Physical change
A Plant turns sunlight, CO2, and water into sugar and oxygen. _Chemical change
Sugar dissolves in water - Physical change
Eggs turn into an omelet. _ Chemical change
Milk sours - Chemical change
A popsicle melts. _____Physical change
Turning brownie mix into brownies - Chemical change
10. A community currently uses coal to produce electricity. What would be an
advantage of using nuclear energy instead? *
a. Uranium is safer than coal
b. Nuclear energy produces no waste
c. Uranium deposits are more abundant than coal
d. Nuclear energy does not produce greenhouse gases
Answer:
c
Explanation:
I'm pretty sure it's C. If it is not then it might be d
is A tomato smells rotten a chemical
reaction
Answer:
yup
Explanation:
because chemical change took place
the reaction cant be reversible
why are vials made from vapor glass stronger then typical vials?
I.they contain aluminum instead of boron.
II. They submerged in hot salt bath.
III. They formed out of long glass tubes.
A) I
B) I and II
C) I and III
D) I, II, and III
Answer:
2
Explanation:
I'm not that sure plz tell me if this is right
Porque una solución acuosa 30g de sal en 80g de agua Que % de masa de sal contiene
Given :
An aqueous solution of 30g of salt in 80g of water.
To Find :
The % mass of the salt.
Solution :
Mass percentage of the salt is given by :
[tex]Mass \ \% = \dfrac{Mass \ of \ salt}{Mass \ of \ salt + Mass \ of \ water}\\\\Mass \ \% = \dfrac{30}{30 + 80 }\times 100 \%\\\\Mass \ \% = 27.27\ \%[/tex]
Hence, this is the required solution.
how much water should be added to 80 grams of common salt so as to obtain 20% salt solution
A student observed an example in which all of the offspring of an organism have the same
genetic material, which is identical to the parent organism. Based on this the student can
conclude that this organism
A.
is unicellular
B.
makes its own food.
C.
reproduces asexually.
D.
has a lot of genetic diversity.
Which tool was most likely used in a procedure if the lab report shows that 300 mL of water was used?
A volumetric flask
A thermometer
A pipette
A graduated cylinder
The answer is A - Volumetric Flask!
Which equation correctly represents the dissociation of a strong acid in water?
Question 26 options:
CH3COOH ↔H++ CH3COO−
NaOH →Na++OH−
HCl →H+ +Cl−
NH3+ H2O↔ NH4++ OH−
The equation that correctly represents the dissociation of a strong acid in water is as follows: HCl → H+ + Cl−
What is acid dissociation?Acid dissociation is the process by which an acid breaks up into it's constituent ions in an aqueous solution.
Acids are known to contain hydrogen ions (H+), hence, dissociate into H+ and an anion.
A strong acid like HCl dissociates completely in an aqueous solution while a weak acid does not dissociate completely.
According to this question, hydrogen chloride (HCl) is said to dissociate into hydrogen ion (H+) and chloride (Cl-) according to the following expression:
HCl → H+ + Cl−
Learn more about acid dissociation at: https://brainly.com/question/4363472
#SPJ1
3.What is evaporation?
(1 Point)
change from solid to liquid
change from solid to gas
change from liquid to solid
change from liquid to gas
change from gas to solid
change from gas to liquid
4.What happens to the motion of particles after evaporation?
(1 Point)
faster
slower
5.What happens to the kinetic energy of particles after evaporation?
(1 Point)
increased
decreased
6.What happens to the distance between particles after evaporation?Immersive Reader
(1 Point)
smaller
wider
HELP PLEASE!!!!!!!
140 grams of lead (II) nitrate are dissolved in water then mixed with a solution containing 75 grams of sodium chloride. The reaction creates the precipitate, lead (II) Chloride, and a solution of sodium nitrate. How many grams of lead (II) Chloride can be produced given the initial amount of lead (II) nitrate?
Answer:
Try a grams calculator, Its pretty to nd one :D
Explanation:
Which of these is most likely to create large areas of land subsidence?
Witch statement about greenhouse gases is false
Answer:
???
Explanation: