Answer:
1km/h =27.778cm/s
therefore
if 1km/h=27.778cm/s
2.350km/h=?
cross multiple
2.350km/h X27.778cm/s /1km/h
=65.2783cm/s
If and acid has a Ka dissociation constant of 1 x 10-9 what is the pKa of this acid?
Answer:
pKa = 9
Explanation:
In this case, we have to remember the meaning of "p". When we use "p" in any calculation we have to apply the minus ten based logarithm, so:
[tex]p~=~-Log[/tex]
For example, when we use the "pH" value. We have to apply the minus ten based logarithm of the concentration of the hydronium ion:
[tex]pH~=~-Log[H^+][/tex]
So, if we have wanted to calculate the pKa value. We have to apply the minus ten based logarithm of the Ka value, so:
[tex]pKa~=~-Log~Ka[/tex]
Now we can plug the value into the equation:
[tex]pKa~=~-Log~1x10^-^9[/tex]
[tex]pKa~=~9[/tex]
The pKa value is 9.
I hope it helps!
The mole is derived from the quantity of atoms in 12 grams of carbon-12. The mole is just a number, it can be used for:_________
Answer:
Explanation:
A mole is the amount of substance that contains as many elementary entities as there are carbon atoms in 12 grams of carbon -12 isotopes i.e. it is the amount of a substance that posses the same number of particles as the number of atoms in exactly 12g of carbon is 12.
The number of atoms in a mole is known to be the Avogadro Number which is equal to 6.02 × 10²³. Thus, a mole of any substance is that amount of the substance which contains 6.02 × 10²³ particles of that substance. The definition of the mole is also given by the relationship:
[tex]\mathtt {moles = \dfrac{ mass \ in \ grams}{ relative \ molecular \ mass}}[/tex]
From his experiments, J. J. Thomson concluded that cathode ray particles can move at very fast speeds. cathode ray particles can be moved by electric current. atoms contain small positively charged particles that are called protons. atoms contain small negatively charged particles that are called electrons. Mark this and return
Answer:atoms contain small negatively charged particles that are called electrons
Explanation:
A car traveling north with a velocity of 30 m/sec slows down to a velocity of 10 m/sec
within 10 sec. What is the car's acceleration?
Answer:
-2m/s/s
Explanation:
Acceleration = change in speed / change in time
Change in speed = final speed - initial speed
In this case the change in speed was 10m/s - 30m/s = -20m/s
And change in time was 10 sec (within 10 sec)
Therefore acceleration = -20/10 = -2m/s/s
The acceleration is negative because the car slowed down (decelerated essentially) and the unit for acceleration is meters per second per second because it is the change in speed per second.
Hope this helped!
what is connecting wire in science
Answer:
Connecting wires provide a medium to an electrical current so that they can travel from one point on a circuit to another. ... In a basic circuit, the wire comes from one terminal of a power source, then connects to a switch that determines whether the circuit is open or closed.
Explanation:
How many moles and numbers of ions of each type are present in the following aqueous solutions?
(a) 88 mL of 1.75 M magnesium chloride,
(b) 321 mL of a solution containing 0.22 g aluminum sulfate/L,
(c) 1.65 L of a solution containing 8.83×10218.83×1021 formula units of cesium nitrate per liter.
Answer:
a. 0.154 moles = 2.78x10²³ ions
b. 2.18x10⁻⁴ moles = 6.56x10²⁰ ions
c. 1.77x10²² ions = 0.0147 moles
Explanation:
The multiplication of volume of solution in liters times molarity gives the moles of solute.
a. Moles MgCl₂:
88mL = 0.088L * (1.75mol / L) = 0.154 moles MgCl₂
Uaing Avogadro's number:
0.154mol *(6.022x10²³ molecules / 1 mol) = 9.27x10²² molecules.
As 1 molecule of MgCl₂ contains 3 ions:
Ions = 2.78x10²³
b. Moles Al₂(SO₄)₃:
Aluminium sulfate has a molar mass of 324.15g/mol:
0.321L * (0.22g Al₂(SO₄)₃ / L) * (1mol / 324.15g) = 2.18x10⁻⁴ moles.
1 molecule contains 5 ions:
2.18x10⁻⁴ moles *(6.022x10²³ molecules / 1 mol) * 5 = 6.56x10²⁰ ions.
c. 8.83x10²¹ formula units of CsNO₃ = Number of molecules. Ions are:
8.83x10²¹ * 2 = 1.77x10²² ions
And moles are:
8.83x10²¹ Formula units * (1mol / 6.022x10²³) = 0.0147 moles
a. The number of moles and number of ions should be 0.154 moles and 2.78x10²³ ions
b. The number of moles and number of ions should be 2.18x10⁻⁴ moles and 6.56x10²⁰ ions
c. The number of moles and number of ions should be 1.77x10²² ions and 0.0147 moles
Calculation of the no of moles and no of ions:a. Moles MgCl₂:
Here,
88mL = 0.088L * (1.75mol / L) = 0.154 moles MgCl₂
Now here we used Avogadro's number:
So,
0.154mol *(6.022x10²³ molecules / 1 mol) = 9.27x10²² molecules.
Since 1 molecule of MgCl₂ contains 3 ions:
So,
Ions = 2.78x10²³
b. Moles Al₂(SO₄)₃:
Since Aluminum sulfate has a molar mass of 324.15g/mol:
So,
0.321L * (0.22g Al₂(SO₄)₃ / L) * (1mol / 324.15g) = 2.18x10⁻⁴ moles.
Now
1 molecule contains 5 ions:
So,
2.18x10⁻⁴ moles *(6.022x10²³ molecules / 1 mol) * 5 = 6.56x10²⁰ ions.
c. Since
8.83x10²¹ formula units of CsNO₃ = Number of molecules. Ions are:
So,
8.83x10²¹ * 2 = 1.77x10²² ions
And moles are:
8.83x10²¹ Formula units * (1mol / 6.022x10²³) = 0.0147 moles
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is xenon (xe) more or less reactive than bromine (br)? why?
Answer:
Xenon is less reactive.
Explanation:
Xenon is a noble gas with 8 valence electrons whereas bromine is a halogen with 7 and is very reactive.
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. Therefore, xenon (xe) is less reactive than bromine (br) as xenon has noble gas electronic configuration.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Xenon (xe) is a 18 group element of a periodic table. The electronic configuration of these are of noble gas. Noble gases are very unreactive. These can't react at even harsh condition. Bromine belongs to group 17 of parodic table that is to halogen family. Halogens have high electronegativity. these are very reactive. the ere one electron less than the noble gas electronic configuration.
Therefore, xenon (xe) is less reactive than bromine (br) as xenon has noble gas electronic configuration.
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what is the formula for tetrasulfur hexabromide
If you answer I will give you a brainliest
Answer:
Tetrasulfur Dinitride S4N2
Tetrasulfur pentoxide S4N4
Tetrasulfur tetranitride N4S4
Tetrasulfur pentoxide S4N4
Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material? Democritus Rutherford Thomson Dalton
Answer:
Thomson
Explanation:
Atomic models were proposed after the discovery of the atom and the sub-atomic particles. Thomson's model of the atom portrayed electrons stuck in the sea of protons. Thus, option C is correct.
What is Thomson's atomic model?J. J. Thomson proposed the model for atoms and their sub-atomic particles called electrons and protons. It was an important model that depicted the presence of the sub-atomic particles in the atom.
According to him, the electron had been known to carry a negative charge that was stuck in the soup or the sea of the positively charged protons. It resembled a plum cake that has electrons stuck in them as the cherries or the plum.
Therefore, the atomic model of the electron stuck in the sea of protons was given by J. J. Thomson.
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Convert 1,650,000 centimeters to kilometers.
0 1.65 kilometers
16.5 kilometers
0 165 kilometers
1,650 kilometers
Answer:
16.5 kilometers is your answer
Answer:
16.5
Explanation:
Desceibe each of the following as a measured number or an exact number:5 books5 Ib9.23 g0.035 kg12 roses12 inches in 1 foot361 miles100 cm in 1 mHow do you determine the last digit in any measured number?
Answer:
The last digit in any measured quantity of a tool is the minimum it can measure so
5 books ---- Exact number
5 lb ---- measured
9.23 g----- measured
9.035Kg measured
12 roses ------ exact
12 inches in 1 foot ----- exact
361 miles ------- measured
100 cm in 1 m ------- exact
Which is the most stable? Carbon (C) Sodium (Na) Helium (He)
It is desired to make 1.00 liter of 6.00 M nitric acid from concentrated 16.00 M HNO3.A) How many moles of nitric acid are in 1.00 L of 6.00 M nitric acid?B) What volume of concentrated 16.00 M nitric acid will contain this number of moles?C) If this volume of concentrated nitric acid (answer to b) is diluted to 1.00 liter, what will be the molarity of the solution?
Answer:
A) 6.00 mol.
B) 0.375 L or 375 mL
C) 6.00 M
Explanation:
Hello,
A) In this case, from the definition of molarity, we compute the moles for the given volume and concentration:
[tex]n=M*V=1.00L*6.00mol/L=6.00mol[/tex]
B) In this case, from the stock solution, the required volume is:
[tex]V=\frac{6.00mol}{16.00mol/L}=0.375L[/tex]
C) In this case, we apply the following formula for dilution process:
[tex]M_1V_1=M_2V_2[/tex]
Thus, solving for the final molarity, we obtain:
[tex]M_2=\frac{M_1V_1}{V_2}=\frac{16.00M*0.375L}{1.00L}\\ \\M_2=6.00M[/tex]
Regards.
In an electrically neutral atom,
o the number of protons equals the number of
neutrons.
the number of protons equals the number of
electrons.
the number of neutrons equals the number of
electrons.
Answer:
the number of Protons equals the number of Electrons.
Explanation:
Edg 2021
In an electrically neutral atom, the number of protons equals the number of electrons. Thus, the correct option for this question is B.
What are Protons?Protons may be defined as the type of sub-atomic particles that are present in the nucleus of an atom along with neutrons. These sub-atomic particles are positively charged in nature. Protons are thought to be discovered by Ernest Rutherford.
Electrons are also the type of sub-atomic particles which are continuously revolving around the nucleus of an atom. These sub-atomic particles are negatively charged in nature.
So, when the number of protons is more as compared to the number of electrons, an atom possesses a positive charge while the number of protons is found to be less compared to the number of electrons, and an atom possesses a negative charge.
Therefore, in an electrically neutral atom, the number of protons equals the number of electrons. Thus, the correct option for this question is B.
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Which of the following compounds are ionic?
a. KCl
b. C2H4
c. BaCl2
d. SiCl4
e. LiF
Answer:
a. KCl, c. BaCl2 and e. LiF.
Explanation:
Hello,
In this case, we can identify the ionic compounds by verifying the difference in the electronegativity between the bonding compounds when it is 1.7 or more (otherwise it is covalent) as shown below:
a. KCl: 3.0-0.9=2.1 -> Ionic.
b. C2H4: 2.5-2.1=0.4 -> Covalent.
c. BaCl2: 3.0-0.8=2.2 -> Ionic.
d. SiCl4: 3.0-1.8=1.2 -> Covalent.
e. LiF: 4.0-1.0=3.0 -> Ionic.
Therefore, ionic compounds are a. KCl, c. BaCl2 and e. LiF.
Regards.
Explain why heat is often used in a laboratory experiment. a. To warm up the laboratory, b. To speed up a reaction
Answer:
To speed up a reaction
Explanation:
Heat, as well as catalysts, increase the reaction rate of some chemical reactions since they cause the enzymes or reagents in charge of carrying out the transformation to products to act faster and increase their kinetic energy of reaction.
What is the volume of 1.50 lb (pounds) of mercury? The density of mercury is 13.546 g/mL. Use the conversion that 1 kg = 2.20 lb. mL.
Answer:
50.3mL of mercury are in 1.50lb
Explanation:
Punds are an unit of mass. To convert mass to volume we must use density (13.546g/mL). Now, As you can see, density is in grams but the mass of mercury is in pounds. That means we need first, to convert pounds to grams to use density and obtain volume of mercury.
Mass mercury in grams:
1.50lb * (1kg / 2.20lb) = 0.682kg = 682g of mercury.
Volume of mercury:
682g Mercury * (1mL / 13.546g) =
50.3mL of mercury are in 1.50lbhow many pi bonds do triple bonds have
Answer:
Two pi bonds, one sigma bond.
Explanation:
A triple bond has three bonds:
2 pi bonds, and one sigma bond.
Answer:
Two pi bonds & one sigma bond.
A triple bond is made of:
2 pi bonds1 sigma bondHope it helps!
Express the following in proper exponential notation.
A. 1512 =
B. 0.00529 =
C. 21.52 X 10^-4
Answer:
A. 1.512*10^3
B. 5.29*10^-3
C. 2.152*10^-3
Explanation:
Exponential notation is where a number is represented in the form:
x * 10^n
where x is a number between 1 and 10.
In order to represent 1512 as a number between 1 and 10, we need to divide it by a multiple of 10. In this case, dividing is by 1000 will move it 3 decimal places to the left and get us 1.512 which is perfect. Because we divided by 1000 to get there, 1.512 needs to multiply by 1000 to equal the original number 1512. Since 1000 = 10^3, 1512 in exponential form is:
1.512*10^3
Similarly for the other ones:
0.00529 we need to multiply by 1000 to get to 5.29 (between 1 and 10) so this needs to multiply by 0.001 (1/1000) to equal original number so in exponential form is:
5.29*10^-3 (10^-3 = 0.001)
Finally:
21.52*10^-4 I would recommend converting back to the original number first, which would give us:
21.52*0.0001 = 0.002152
Which we need to multiply by 1000 to get right number so in exponential form is:
2.152*10^-3
Hope this helped!
How important are minerals in our daily lives?
Explanation:
minerals are common in vitamin product iron and calciumall provide day to day nutrients dad the bmicoody needs in order to function food that are full of
Answer:
It is very important in our lives....
Explanation:
It is used to create the materials,used in construction of roads and buildings,they also serve as critical components in the manufacturing of high tech electronics.
Can a model be improved so much that it leads to truth? Explain your answer.
Answer:
yes it can
Explanation:
a model can be improved so much that it increases your chances of (insert what ever you are writing about) and then describe why:)
5 pois
Energy pyramids illustrate the transfer of 10% of the energy stored by
producers flowing from the bottom level to primary consumers. What
happens to the other 90% of the energy?
О
The remaining 90% is transformed for life activities such as movement, growth, or
released as heat.
The remaining 90% evaporates into the atmosphere.
The remaining 90% transforms into Hydrogen and Oxygen.
The remaining 90% is recombined to maker larger molecules.
A mountaineer shouts for help Half a second later (0.5 she hears the echo How far away is the rock face which is reflecting her voice (take the speed of sound to be 330 m\s) help please I will mark brain liest
Answer:
THE DISTANCE OF THE ROCK REFLECTING HER VOICE IS 82.5 METERS.
Explanation:
In sound waves, the speed of a sound is equal to twice the distance divided by time.
Mathematically,
Speed = 2 * Distance/ Time
Speed = 33- m/s
Time = 0.5 second
Distance = unknown
So re-arranging and introducing the variables into the formula, we have;
Distance = speed * time / 2
Distance = 330 * 0.5 / 2
Distance = 82.5 meters.
The distance away from the rock face which is reflecting her voice is 82.5 meters.
List 5 characteristics of a living thing
Answer:
1.Growth.
2 Reproduction.
3.respond to stimuli
4.are made from more than 1 cell
5.need energy to live
hope this helped
The concentration of Salt Solution is teams
of mass by mass it is 20% and the
mass of the Solution IS 550
Detrmine the mass of Solute Present
in th Solution?
Answer:
11
Explanation:
so that is 20\100× 55 that gives you 11
thanks so please follow me
Rank the following compounds from most acidic to least. To rank items as equivalent, overlap.A. CH3NH2B. CH3OH+C. 2CH3OH
When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula for this compound?
Answer:
HfCl3
Explanation:
Step 1
Divide the percent by mass of each element by its relative atomic mass
Hf- 62.2/178.5, Cl-37.4/35.5
0.348, 1.054
Step2
Divide through by the lowest ratio
0.348/0.348, 1.054/0.348
1, 3
Therefore the empirical formula is HfCl3
Eric's father asked an engineer to survey the field behind their house. He wanted to plant some apple and pear trees there. According to the survey, the field is 38 meters (m) long and 17 meters (m) wide. What is the perimeter of the field in centimeters?
Answer:
11,000 cm
Explanation:
Step 1: Given data
Width of the field (w): 17 meters
Length of the field (l): 38 meters
Step 2: Calculate the perimeter of the field
The field is a rectangle. We can find its perimeter (P) by adding its sides.
P = 2 × w + 2 × l = 2 × 17 m + 2 × 38 m = 110 m
Step 3: Convert the perimeter to centimeters
We will use the relationship 1 m = 100 cm.
110 m × (100 cm/1 m) = 11,000 cm
Challenge: In a 60 km/h speed zone the police set up a digitector, placing 2 cables across the road, 5m apart The time taken for cars to cross both cables was recorded. One car took 0.2 seconds to cross the cables. Was it speeding? If so by how much?
Answer:
The answer to your question is given below.
Explanation:
The following data were obtained from the question:
Speed limit = 60 km/h
To know if the car was speeding, let us calculate the speed of the car.
This can be obtained as follow:
Distance (d) = 5 m
Convert 5 m to km
Recall:
1000 m = 1 km
5 m = 5/1000
5 m = 0.005 km
Time (t) = 0.2 sec.
Convert 0.2 sec to hour.
Recall:
3600 secs = 1 h
Therefore,
0.2 sec = 0.2/3600
0.2 sec = 5.56×10¯⁵ h
Thus,
Distance (d) = 0.005 km
Time (t) = 5.56×10¯⁵ h
Speed of car =?
Speed = Distance /time
Speed = 0.005/5.56×10¯⁵
Speed of the car = 90 km/h
Comparing the speed of the car (i.e 90 km/h) to the speed limit of the zone (i.e 60 km/h), we can see that the car is on a high speed since its speed (i.e 90 km/h) is higher than the speed limit of the zone (i.e 60 km/h).
Speed of the car = 90 km/h
Speed limit = 60 km/h
Difference = 90 – 60
Difference = 30 km/h
Therefore, the car is speeding by 30 km/h more compared to the speed limit.
A box is pushed down at an angle of 32 degrees on a rough surface. The box moves to the right.
A picture of a woman pushing downward at an angle of 32 degrees with the horizontal on a box. There is a dot in the center of the box and a force pointing southeast away from it labeled F Subscript p.
What equation should be used to find the net force in the y-direction?
F subscript net, y = F subscript N minus F subscript g.
F subscript net, y = F subscript p minus F subscript f.
F subscript net, y = F subscript N minus F subscript g minus F subscript p cos(32).
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Answer:
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Explanation:
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
Forces acting on box :
We have four forces acting on the box. Taking the upward direction as positive direction for the vertical axis:
- The push, which pushes down along the ramp inclined at 32 degrees. Its vertical component will be , where F is the magnitude of the push
- The weight of the box, of magnitude , with m being the mass of the box and g being the acceleration of gravity (9.8 m/s^2). This force is already directed vertically downward, so we don't need to resolve it into the vertical direction
- The frictional force, of magnitude , where is the coefficient of friction, directed upward along the inclined plane. Its vertical projection will be
- The normal reaction, whose magnitude is equal to the component of the weight perpendicular to the inclined plane, but with opposite direction (upward): . If we resolve it along the vertical direction.
So, the net force along the y-direction will be:
F subscript net, y = F subscript N minus F subscript g minus F subscript p sin(32).
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