Answer:
5m/s²
Explanation:
Given parameters:
Initial velocity = 10m/s due east
Final velocity = 30m/s due east
Time = 4s
Unknown:
Acceleration of the car = ?
Solution:
Acceleration is the rate of change of velocity with time.
Mathematically;
Acceleration = [tex]\frac{v - u}{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
Insert the parameters and solve;
Acceleration = [tex]\frac{30 - 10}{4}[/tex] = 5m/s²
It isa sex characteristic that has direct relation to sexual reproduction?what is it..
How many liters of fat would have to be removed to result in a 5.2 lb weight loss? The density of human fat is 0.94 g/mL?
The body fat of humans can be measured by the density in grams per mL. The volume of the fat with a density of 0.94 g/mL and mass of 5.2 lb is 2.50 L.
What is volume?The volume is the factor of the dimension that inversely affects the density of the substance. The volume is given by the division of the mass by the density. It can be given in mL or cubic centimeters.
Given,
Mass of body fat = 5.2 lb
Density of human fat = 0.94 g/mL
At first, mass is converted from lb to grams as:
1 lb = 453.592 grams
So, 5.2 lb = 2358.68 grams
Secondly, volume is calculated as:
Volume = Mass ÷ density
V = 2358.68 grams ÷ 0.94 g/mL
= 2509.23 mL
Thirdly, volume from ml is converted to L as:
1 mL = 0.001 L
2509.23 mL = 2.50 L
Therefore, 2.50 liters of body fat has to be removed from the body.
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For a solution in which both an acid and base are present, the forward and reverse rates of proton transfer will:______.a. always be equal.
b. never be equal.
c. be equal once equilibrium is reached.
d. depends on the acid and base.
Answer:
be equal once equilibrium is reached.
Explanation:
Given an equilibrium proton transfer such as the one written below;
HA + :B ⇄ HB + :A
The rate of forward reaction and the rate of reverse reaction becomes equal at equilibrium.
To put it in another way, at equilibrium, the rate of forward and reverse rates of proton transfer will be equal.
PLS HELP THE QUESTION IS ON THE PICTURE
Concepts used:
1 mole of an element or a compound has 6.022 * 10²³ formula units
So, we can say that: Number of formula units = number of moles * 6.022*10²³
number of moles of an element or a compound = given mass/molar mass
__________________________________________________________
003 - Number of CaH₂ formula units in 6.065 grams
Number of Moles:
We know that the molar mass of CaH₂ is 42 grams/mol
Number of Moles of CaH₂ = given mass/molar mass
Number of moles = 6.065 / 42
Number of moles = 0.143 moles
Number of Formula units:
Number of formula units = number of moles * 6.022*10²³
= 0.143 * 6.022 * 10²³
= 0.86 * 10²³ formula units
__________________________________________________________
004 - Mass of 6.34 * 10²⁴ formula units of NaBF₄
Number of Moles:
We mentioned this formula before:
Number of formula units = number of moles * 6.022*10²³
Solving it for number of moles, we get:
Number of moles = Number of Formula units / 6.022* 10²³
replacing the variable
Number of moles = 6.34 * 10²⁴ / 6.022*10²³
Number of moles= 10.5 moles
Mass of 10.5 moles of NaBF₄:
Molar mass of NaBF₄ = 38 grams/mol
Mass of 10.5 moles = 10.5 * molar mass
Mass of 10.5 moles = 10.5 * 38
Mass = 399 grams
__________________________________________________________
005 - Number of moles in 9.78 * 10²¹ formula units of CeI₃
Number of Moles:
We have the formula:
Number of moles = Number of Formula units / 6.022* 10²³
replacing the variables
Number of Moles = 9.78 * 10²¹ / 6.022*10²³
Number of Moles = 1.6 / 10²
Number of Moles = 1.6 * 10⁻² moles OR 0.016 moles
if 15 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed?
Use the reaction given below to solve the problem that follows: Calculate the mass in grams of aluminum metal required to react with 115 g of oxygen gas.
4 Al + 3 O2 ——> 2 Al2O3
Answer: _____ grams Al
Answer:
129.4g
Explanation:
Reaction equation":
4Al + 3O₂ → 2Al₂O₃
Given mass of oxygen = 115g
Unknown:
mass of aluminum metal that reacted;'
Solution:
We need to convert the given mass of O₂ to mole;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of O₂ = 2(16) = 32g/mol
Number of moles = [tex]\frac{115}{32}[/tex] = 3.6mol
From the balanced reaction equation:
3 moles of O₂ reacted with 4 mole of Al
3.6 moles of O₂ will react with [tex]\frac{3.6 x 4}{3}[/tex] = 4.8mol
Mass of Al = number of moles x molar mass
Mass of Al = 4.8 x 27 = 129.4g
A chemical reaction that releases heat to the surroundings is said to be __________ and has a __________ ΔH at constant pressure.
Explanation:
A chemical reaction that has a positive ΔH is said to be endothermic, while a chemical reaction that has a negative ΔH is said to be exothermic.
If 50.9 g of aspirin (C₉H₈O₄) are produced from 79.8 g of C₇H₆O₃, what is the percent yield from the reaction below?
C₇H₆O₃ (s) + C₄H₆O₃ (s) → C₉H₈O₄ (s) + HC₂H₃O₂ (aq).
Answer:
This may or may not be right its been a while since I took chemistry but 63.78%
Explanation:
The yield is 50.9 so you would divide the yield by the source.
50.9/79.8= .637844621
than conver that to a percentage and you have your answer I think.
May or may not be right like I said it's been a while but I hope its right and it helps.
What is meant by the "frequency of light"? What symbol is used for it, and what is the SI unit for frequency?
Answer: Units. The SI derived unit of frequency is the hertz (Hz), named after the German physicist Heinrich Hertz. One hertz means that an event repeats once per second.
The frequency is the number of waves that pass a point in space during any time interval, usually one second. We measure it in units of cycles (waves) per second, or hertz. The frequency of visible light is referred to as color, and ranges from 430 trillion hertz, seen as red, to 750 trillion hertz, seen as violet.
Frequency of an electromagnetic wave is the number of wave cycles per unit time. The SI unit of frequency is Hertz or Hz. Frequency is represented by the symbol v called neu.
What is electromagnetic wave?Waves are propagation or transfer of energy through air or vacuum. An electromagnetic wave is associated with a combined electric field and magnetic field.
Waves are associated with characteristic frequency and wavelength. Wavelength of a wave is the distance between its two consecutive crests or troughs.
Frequency of a wave is the number of wave cycles per unit time. Its is expressed in the unit of Hertz or Hz. Frequency and wavelength are in inverse relation. The shortest waves have greater energy and greater frequency.
Frequency is inverse of time of propagation. So that it can also be used in s⁻¹ which is equal to one hertz.
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The isotope of carbon used in archaeological dating is 14^6C . How many protons, neutrons, and electrons does an atom of 14^6C have?
Answer:
6
8
6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
Solve each of the following problems using dimensional analysis.
Answer:
12ml should be the answer
Explanation:
what is the main function of the skeletal system in relation to the muscular system
A. to produce enzymes that help muscles repair themselves
B. to provide attachment points for muscles
C. to produce muscle cells inside the bone marrow
D. to assist muscles in growth and development
Answer:
B
Explanation:
muscles attach to the skeleton in order for the body to be sturdy. as you probably know, the skeletal system is mainly used for providing support to the body so it won't fall down.
ID:
16. A mineral is always a(n)
because it has a definite volume and shape.
Answer:
Solid
Explanation:
What is the expected major organic product from the treatment of 4-methyl-2-pentyne with excess hydrogen in the presence of a platinum catalyst?
a. (E)-4-methyl-2-pentene
b. (Z)-4-methyl-2-pentene
c. (E)-2-methyl-2-pentene
d. (Z)-2-methyl-2-pentene
e. 2-methylpentene
Answer:
(Z)-4-methyl-2-pentene
Explanation:
Hydrogenation is a syn addition. This implies that the hydrogen atoms add to the same face of the multiple bond.
Hence, if we have the alkyne, 4-methyl-2-pentyne which reacts with excess hydrogen in the presence of a platinum catalyst, we obtain (Z)-4-methyl-2-pentene since the hydrogen atoms add on the same side of the multiple bond.
Write out the (balanced) chemical equation for the reaction that occurs when hypochlorous acid, a weak acid, reacts with water.
Answer:
[tex]HClO+H_2O\rightarrow H_3O^++ClO^-[/tex]
Explanation:
Hello!
In this case, since hypochlorous acid (HClO) is a weak acid, which means it is not complete ionized in aqueous solution, represented by the reaction with water to obtain hydronium ions, which are the responsible of its acidity, and hypochlorite ions, we can write:
[tex]HClO+H_2O\rightleftharpoons H_3O^++ClO^-[/tex]
It is seen it is already balanced since there are three hydrogen atoms, one chlorine atom and two oxygen atoms at both reactants and products. It is important to notice the presence of the equilibrium arrow, which represents that the hydronium ions and the chlorate ions are able to come back to the initial hypochlorous acid and water.
Best regards!
. Calculate the entropy change associated with the isothermal compression of 0.720 mol of an ideal gas from 24.32 L to 3.90 L.
Answer:
[tex]$\Delta S = -10.95 \ \frac{J}{K}$[/tex]
Explanation:
Given :
Number of mole, n = 0.720 mol
Initial volume, [tex]$V_1$[/tex] = 24. 32 L
Final volume, [tex]$V_2$[/tex] = 3.90 L
We know entropy change,
[tex]$\Delta S = c_V\ln \left(\frac{T_2}{T_1}\right) + n R \ln \left(\frac{V_2}{V_1}\right)$[/tex]
For isothermal compression temperature constant,
[tex]$\Delta S = n R \ln \left(\frac{V_2}{V_1}\right)$[/tex]
[tex]$\Delta S = 0.720 \times 8.314 \times \ln \left(\frac{3.90}{24.32}\right)$[/tex]
[tex]$\Delta S = -10.95 \ JK^{-1}$[/tex]
[tex]$\Delta S = -10.95 \ \frac{J}{K}$[/tex]
what was the slope of the best fit line
Answer:
sorry I don't really know
Describe the famous experiment related to gravity that Galileo may have performed. Include the results. Also, state whether the results support the law of gravity. Explain your answer.
Answer:
Galileo performed a famous experiment where he used a ball rolling on a ramp (inclined plane) to study the motion of objects under the influence of gravity. The ramp allowed him to make more precise measurements because the ball moved more slowly along the ramp than if it were simply dropped. Galileo discovered through this experiment that the objects fell with the same acceleration, proving his prediction true, while at the same time disproving Aristotle's theory of gravity (which states that objects fall at speed proportional to their mass). Galileo's conclusion from this thought experiment was that no force is needed to keep an object moving with constant velocity. Newton took this as his first law of motion. One result of the experiment surprised Galileo, and one surprises us. Galileo found that the heavy ball hit the ground first, but only by a little bit. Except for a small difference caused by air resistance, both balls reached nearly the same speed. And that surprised him. According to history, Galileo’s experiment on falling bodies largely contributed to Isaac Newton’s Law of Gravity. In Galileo’s experiment, he is said to have dropped balls from the Leaning Tower of Pisa. The balls were made of the same material but had different masses. Galileo set out to prove that the time it took for these objects to reach the ground would be the same. Galileo proved that objects reached the ground at the same time,
Explanation:
I think this is right & I hope this helped
Galileo demonstrated that gravity causes things of various masses to fall with the same acceleration by dropping weights from the leaning Tower of Pisa.
What is gravity?Gravitational force is the force by an object attracts other objects into its center of mass. Earth attracts every objects on its surface to the ground by gravitational pull.
The outcome of Galileo's gravity experiment supports the equivalence principle, which forms the basis of general relativity, Albert Einstein's theory of gravity.
According to this theory, an object's inertial mass which determines how quickly it accelerates when a force is applied and gravitational mass which determines how much of a gravitational force it experiences are the same. The conclusion is that an object's acceleration due to gravity is dependent of both its mass and composition.
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Calculate the pH of the cathode compartment solution if the cell emf at 298 K is measured to be 0.660 V when (Zn^2+)=0.22 M and(P_H2)= 0.87atm.
Answer:
pH = 2.059
Explanation:
At the Cathode:
The reduction reaction is:
[tex]2H^+ + 2e^- \to H_2 \ \ \ \mathbf{E^0_{red}= 0.00 \ V}[/tex]
At the anode:
At oxidation reaction is:
[tex]Zn \to Zn^{2+} +2e^- \ \ \ \mathbf{E^0_{ox} = 0.76 \ V}[/tex]
The overall equation for the reaction is:
[tex]\mathbf{Zn + 2H^+ \to Zn^{2+} + H_2}[/tex]
The overall cell potential is:
[tex]\mathbf{E^0_{cell}= E^0_{ox} + E^0_{red}}[/tex]
[tex]\mathbf{E^0_{cell}= 0.76 \ V +0.00 \ V}[/tex]
[tex]\mathbf{E^0_{cell}= 0.76\ V}[/tex]
Using the formula for the Nernst equation:
[tex]E = E^0 - ( \dfrac{0.0591}{n})log (Q)\\[/tex]
where;
E = 0.66
(Zn^2+)=0.22 M
Then
[tex]0.66 =0.76- ( \dfrac{0.0591}{2})log \bigg ( \dfrac{[Zn^{2+} ] PH_2}{[H^+]^2} \bigg )[/tex]
[tex]0.66 =0.76- 0.02955 * log \bigg ( \dfrac{0.22*0.87}{[H^+]^2} \bigg )[/tex]
3.4 = log ( 0.1914) - 2 log [H⁺]
3.4 = -0.7180 - 2 log [H⁺]
3.4 + 0.7180 = - 2 log [H⁺]
4.118 = - 2 log [H⁺]
pH = log [H⁺] = 4.118/2
pH = 2.059
The pH of the solution as described in the question is 2.7.
The equation of the reaction is;
Zn(s) + 2H^+(aq) ----> Zn^2+(aq) + H2(g)
The partial pressure of hydrogen can be converted to molarity using;
P= MRT
M = P/RT
M = 0.87atm/0.082 LatmK-1mol-1 × 298 K = 0.036 mol/L
We have to obtain the reaction quotient
Q = [Zn^2+] [H2]/[H^+]^2
Q = [0.22 ] [0.036]/[H^+]^2
Recall that, from Nernst equation;
E = E° - 0.0592/nlog Q
E° = 0.00V - (-0.76V) = 0.76V
0.660 = 0.76 - 0.0592/2logQ
0.660 - 0.76 = - 0.0592/2logQ
-0.1 = - 0.0592/2logQ
-0.1 × 2/ - 0.0592 = logQ
3.38 = log Q
Q = Antilog (3.38)
Q= 2.39 × 10^3
Now;
2.39 × 10^3 = [0.22 ] [0.036]/[H^+]^2
2.39 × 10^3 = 7.92 × 10^-3/[H^+]^2
[H^+]^2 = 7.92 × 10^-3/2.39 × 10^3
[H^+] = 1.82 × 10^-3
pH = -log[H^+]
pH = -log[ 1.82 × 10^-3]
pH = 2.7
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5 10 Which organelle is the control center of the cell? vacuole endoplasmic reticulum cytoplasm
Answer:
nucleus
Explanation:
Answer:
Nucleus Is the control center of the cell
Explanation:
Hope it help
Chromium oxide reacts with hydrogen sulfide gas to form chromium
Answer:
true
Explanation:
Determine the number of moles of a sample at 1.8 atm, 130 mL, and 78°C.
Can somebody please help me with these 3 questions ? and explain them so I can understand them
Explanation:
1. The group of atoms above bonded together is
called a molecule.
Therefore,
Option A is correct ✔
2. There's 4 H-atom in 2H₂O
Therefore,
Option A is correct ✔
3. There's 2 molecules in 2Al₂O₃
Therefore,
Option A is correct ✔
Which statement best explains why an object appears green in sunlight?
O The object absorbs most white light and refracts most green light.
O The object refracts most white light and absorbs most green light.
O More green light is absorbed while more red and blue light is reflected.
More green light is reflected while more red and blue light is absorbed.
Answer: A
Explanation: not sure what to say but it’s for sure A it makes sense :) good luck !
The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).
What is Reflection ?Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.
Common examples include the reflection of light, sound and water waves.
Colored objects look the way they do because of reflected light. When sunlight is shined on a green leaf, the violet, red and orange wavelengths are absorbed. The reflected wavelengths appear green.
Therefore, The statement best explains why an object appears green in sunlight is (D) More green light is reflected while more red and blue light is absorbed.Hence the correct option is (D).
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help me plz plz plz plz plz plz plz plz plz plz plz plz plz :(
Do you think these molecules are larger or smaller than a cell in the human body? Explain your answer.
Molecules which have a larger size as compared to pores of cell membrane then they can't pass through it.
Small size moleculesWater, carbon dioxide, glucose and oxygen are some of the molecules that can pass through the cell membrane of the cell by the process of diffusion while on the other hand, large molecules such as sugars and proteins can't enter inside the cell due to their large size.
Pores present in cell membraneThe cell has semipermeable membrane which has small pores. Through these pores small size materials can pass through whereas large molecules can't pass through it due to their large size so we can conclude that molecules which have a larger size as compared to pores of cell membrane then they can't pass through it.
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Which compound contains a double bond?
ethene (C2H4)
chlorine (C12)
ammonia (NH3)
methane (CH)
Answer:
ethene
Explanation:
just took the test :D
10. How many electrons did Br?- gain or lose?
It did not gain or lose any electrons, it lost a proton.
It did not gain or lose any electrons, it gained a proton.
O It lost one electron because it has a charge of negative one.
0 It gained one electron because it has a charge of negative one.
What type of wave is shown here?
:transverse wave
:longitudinal wave
What is the Molarity 2 mol of KL discovered in 1 L water
Answer:
Molarity = 2 M
Explanation:
Given data:
Molarity of solution = ?
Number of moles = 2 mol
Volume of water = 1 L
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula
Molarity = number of moles of solute / L of solution
Molarity = 2 mol / 1 L
Molarity = 2 M
By weight atmospheric air is approximately 23.15% oxygen and 76.85% nitrogen. What is the partial pressure of oxygen in the air at standard temperature and pressure
Answer:
Partial pressure of oxygen = 23.38 kpa (Approx)
Explanation:
Given:
Amount of oxygen = 23.15%
Amount of nitrogen = 76.85%
Pressure (missing) = 101 kpa
Find:
Partial pressure of oxygen
Computation:
Partial pressure of oxygen = [Amount of oxygen x Pressure]/100
Partial pressure of oxygen = [23.15% x 101]/100
Partial pressure of oxygen = 23.38 kpa (Approx)