Answer:
The sum of an object's potential and kinetic energies is called the object's mechanical energy. As an object falls its potential energy decreases, while its kinetic energy increases. The decrease in potential energy is exactly equal to the increase in kinetic energy
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The mass of an atom composed of 7 protons, 8 neutrons, and 7 electrons is
Answer:
Nitrogen
Explanation:
What kind of energy is required for photosynthesis to occur?
energy stored in chemical bonds
energy from nutrients in the ground
thermal energy
solar energyy
Answer:
Explanation:
Solar energy
Your answer is 100% Solar Energy,
Baking soda with hydrochloric acid combine and bubbles form. Chemical or physical change.
Answer:
I believe it is a chemical change.
Classify each of the following processes as spontaneous or nonspontaneous
how many mole are in 5.25 × 10²⁵ atoms of Au
Answer:
87.21 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.25 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 87.209302...[/tex]
We have the final answer as
87.21 molesHope this helps you
The United States is one country that does not fully use the metric system for measurement.
Yes or No
Answer: yes
Explanation:
1.
Based on the following information, arrange the A, B, C, and D from lowest to highest
activity (in order of increasing ability to act as reducing agents).
I. Only A, C and D react with 1 mol/L HCl to give H2(e).
II. When A is added to solutions of the other metal ions, metallic B and Care
formed but not D.
a) C
b) B
c) B
d) C
e) B
Order of metals from least reactive to most reactive: B <C <A <D
Further explanationReducing agents are substances that experience oxidation
Oxidizing agents are substances that experience reduction
The metal activity series is expressed in voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent
So that the metal located on the left can push the metal on the right in the redox reaction
Let's analyze the statement in the problem
I. Only A, C and D react with 1 mol/L HCl to give H₂(e)
M + HCl ⇒ MCl + H₂(MCl : alkali, MCl₂ : alkaline earth)
A, C and D can react with 1 mol / L HCl, meaning metals A, C and D are located to the left of element H (more reactive), and B in the right of element H
II. When A is added to solutions of the other metal ions, metallic B and C are formed but not D.
This means that metal A is more reactive than metals B and C, while D is more reactive than A, so metal D is the most reactive
An electron at rest is subjected to two simultaneous constant magnetic fields; one is in the ax direction and the other is in the ay direction. The electron will:__________
Answer:
never move
Explanation:
Just like an electric current, we can only see the effects of magnetism when an electron is subjected to two simultaneous constant magnetic fields.
An electron at rest that is subjected to a magnetic field will never move but only in an electric field. The electrons are subjected to an electric force collinear with the electric field but in the opposite direction (the charge is negative).The acceleration vector tends to be in the same direction as the force, opposite the electric field.
calculate the volume of nitrogen gas produce by heating g of ammonia at 21c and 823 torr pressure
Answer:
final volume = 10.5 Liters N₂(g) at 21°C and 823Torr*
Explanation:
*Note=>No specified mass value of N₂(g) is defined in the problem. Therefore for a starting point, the gas sample is assumed to be 1.00 mole N₂(g) at STP conditions 22.4L
Determine volume of N₂(g) at 21°C(=294K) and 823 Torr (= 2.286 Atm).
Start with Volume of N₂(g) at 0°C and 1 Atm pressure => 22.4L and adjust to final volume of N₂(g) based upon 21°C(=294K) and 823 Torr (= 2.286 Atm).
V(final) = 22.4L(294K/273K)(360 Torr/823 Torr) = 22.4L(294/273)(360/823) = 10.55 Liters final volume.
Note: The volume of 1 mole (assumed) of any gas at STP (0°C/1 Atm) is 22.4 Liters. To convert to non-STP conditions, convert temperature and pressure factors (changes) that reflect what happens when the gas is expanded or decreased; but, these adjustments are taken independently for each variable of interest. The following notes explain.
For the increase in temperature from 0°C(=273K) to 21°C(=294K) one must apply a temperature ratio that will increase volume. That is, the change in volume due to the temperature change is 294K/273K. If a 273K/294K ratio were used the volume would have decreased. Not so for heating a sample of gas.
For the increase in pressure one should expect a decrease in volume. Therefore apply a pressure ration that will effectively decrease the volume of the gas. That is, to decrease a 22.4L sample at STP multiply the standard volume by a ratio of pressures that will decrease 22.4L to a smaller volume. That is, V(final by pressure effects) multiply by 360Torr/823Torr to decrease the STP VOLUME (22.4L) to the new non-standard volume. If 823Torr/360Torr were used, the final volume would not be smaller, but larger. Such is the physical effect of an increasing pressure change.
Please help I’ll mark brainliest!
What is the [H 30 +) in a solution with [OH = 1x10-12 M?
Answer: The way to get the answer is to know and understand certain relationships between [H3O+] and [OH-]. One such relationship which you must know (memorize) is...
[H3O+] [OH-] = 1x10-14 = Kw (the rest is algebra)
[H3O+] [1x10-12] = 1x10-14
[H3O+] = 1x10-14 / 1x10-12
[H3O+] = 1x10-2 = 0.01 M
Explanation: HOPE IT HELPS!
What would be a good hypothesis for this data ?
Answer:
Organism B produces pyruvic acid at a faster rate as the temperature increases than Organism A.
Explanation:
A sample of an ideal gas at 1.00 atm and a volume of 1.98 L was placed in a weighted balloon and dropped into the ocean. As the sample descended, the water pressure compressed the balloon and reduced its volume. When the pressure had increased to 55.0 atm, what was the volume of the sample? Assume that the temperature was held constant.
Answer:
Final Volume = 0.036 L
Explanation:
Initial Pressure P1 = 1 atm
Initial Volume V1 = 1.98L
Final Pressure T1 = 55.0 atm
Final Volume V2 = ?
Temperature was held constant
The formulae relating these variables is Charles Law. This law states that the volume of a gas is inversely proportional to the pressure of a gas system provided temperature is held constant. The equations given as;
V1P1 = V2P2
V2 = V1P1 / P2
V2 = 1.98 * 1 / 55
V2 = 0.036 L
Neutron moderation is used to counteract:
O A. the heat generated during nuclear fission reactions.
O B. the chain reactions that naturally occur with uranium-235.
O C. the low concentration of uranium-235 in nature.
O D. the minimal chance that the newly formed neutrons of a fission
reaction are absorbed by more atoms.
Answer:
(D) The minimal chance that the newly formed neutrons of a fission
Explanation:
I got it right on A P E X
Answer:
D. the minimal chance that the newly formed neutrons of a fission
reaction are absorbed by more atoms.
Explanation:
took test
how many moles are in 2.91 × 10²² atoms of He?
Answer:
0.048 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{2.91 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.04833887...[/tex]
We have the final answer as
0.048 molesHope this helps you
Which choice best explains how global winds are formed?
Answer:
what are the choices?
Explanation:
How many moles are in 5.6x1025 molecules of calcium oxide?
Answer:
93.02 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.6 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 93.023...[/tex]
We have the final answer as
93.02 molesHope this helps you
Which statement is true?
A. Less reactive substances will not undergo chemical reactions.
B. Reactivity is the rate at which a substance undergoes a chemical reaction.
C. A substance's reactivity is determined by its location in the periodic table.
D. Every element in the periodic table reacts strongly with water.
Answer:
I answer is c I'm sorry if I'm wrong but please mark me brainlest I will mean a lot
A light absorbing chemical has a molar absorptivity constant of 487 L/mol*cm. For a system with a 1.00 cm path length, what chemical concentration would result in a recorded % transmittance of 31.6?a. None of these b. 974 M c. 0.000649 M d. 0.00103 M e. 0.0649 M
Answer:
The right answer is Option d (0.00103 M).
Explanation:
The given values are:
T = 31.6
e = 487 L mol cm
length, l = 1 cm
As we know,
Absorbance,
[tex]A=2-log_{10}(percent \ T)[/tex]
[tex]A=2-log_{10}(31.6)[/tex]
[tex]A=0.5003[/tex]
By using the Beer's law, we get
⇒ [tex]A=ecl[/tex]
⇒ [tex]c=\frac{A}{el}[/tex]
On substituting the values, we get
⇒ [tex]=\frac{0.5003}{487\times 1}[/tex]
⇒ [tex]=0.001027 \ \frac{mol}{L}[/tex]
⇒ [tex]=0.00103 \ M[/tex]
please helppppp!!!
The Periodic Table is arranged by _______ properties:metals (mostly to the ____ of table,) metalloids(along the _____, and nonmetals) ( mostly to the ____ of table) . It is also arranged by chemical properties, including reactivity. Elements in the same vertical group have the same number of _____ electrons, and elements in the same horizontal period have the same number of _____ shells.
Explanation:
physicalleftmiddlerightouter mostelectron shellsWhat is the 8th term in the geometric sequence described by this explicit formula?
An=6×3(n-1)
A.2187
B.612,220,032
C.13,122
D.39,366
Answer: C
Explanation: Answered this same question on a test before
How does the acid level of a lake affect how many fish live there?
The dependent and independent Variable?
Answer:
it affects by how many fishes it kills i think
Explanation:
A 25.0mL sample of an acetic acid solution is titrated with a 0.175M NaOH solution. The equivalence point is reached when 37.5mL of the base is added. The concentration of acetic acid in the sample was :_________.A) 0.263
B) 0.365
C) 0.175
D) 1.83×10−4
E) 0.119
Answer:
Explanation:
First of all, let's write the equation of the reaction.
CH₃COOH + NaOH ⇒ CH₃COONa + H₂O
The formula to be used here is CaVa/CbVb = na/nb
where Ca is the concentration of the acid (?)
Cb is the concentration of the base (0.175M)
Va is the volume of the acid (25 mL)
Vb is the volume of the base (37.5 mL)
na is the number of moles of acid (1)
nb is the number of moles of base (1)
Ca × 25/0.175 × 37.5 = 1/1
Ca = 0.175 × 37.5 × 1 /25 ×1
Ca = 0.263 M
The concentration of the acid in the sample was 0.263 M
If two forces are heading in the same direction, we ______ them to calculate net force.
options:
add
or
subtract
Answer:
add
Explanation:
The complex [FeSCN]2+ has an absorptivity of 6.14×10−2 L/(mg⋅cm) at a wavelength of 580 nm. The transmittance of a solution sample was measured in a 1.00 cm cell, and the percent transmittance %T was 53.9%. Calculate the concentration of the solution in ppm.
Answer:
4.36 ppm
Explanation:
First we convert percent transmittance to absorbance:
A = 2 - log(%T)A = 0.268Then we calculate the concentration of the solution, using Lambert-Beer's equation:
A = ε*l*CIt is usually used with molar concentrations but given that the given absortivity is in ppm terms and the answer is also in ppm, we can simply use the given value.
0.268 = 6.14x10⁻²L·ppm⁻¹ * 1.00 cm * CC = 4.36 ppmThe concentration of the solution is 4.36 ppm when the percent transmittance measured in a 1.00 cm cell is 53.9%, the absorptivity is 6.14x10⁻² L/(mg*cm), and the wavelength is 580 nm.
We can calculate the concentration of the solution with the Beer-Lambert equation:
[tex] A= \epsilon Cl [/tex] (1)
Where:
A: is the absorbanceC: is the concentration =?l: is the length of the optical path = 1.00 cm ε: is the absorption coefficient = 6.14x10⁻² L/(mg*cm)With the transmittance, we can find the absorbance as follows:
[tex] A = -log T [/tex]
Where T is the transmittance = 53.9% = 0.539
So, the absorbance is:
[tex] A = -log T = -log(0.539) = 0.268 [/tex]
Finally, by solving equation (1) for C, we have:
[tex] C = \frac{A}{\epsilon l} = \frac{0.268}{6.14 \cdot 10^{-2} L/(mg*cm)*1.00 cm} = 4.36 mg/L [/tex]
Therefore, the concentration of the solution is 4.36 ppm.
You can find more about absorbance and transmittance here:
brainly.com/question/14919298brainly.com/question/6167291I hope it helps you!
why is it necessary to use models to study submicroscopic objects such as atoms and molecules
Answer:
It is necessary to use models to study sub- microscopic objects such as atoms and molecules because they are too small to be seen.
please help urgent!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
How can you safely turn on and off an electromagnet on and off?
HELP ME PLEASE!!!!!!!!
Which of the following graphs correctly shows the relationship between potential energy and internuclear separation for two hydrogen atoms
Answer:
D
Explanation:
The potential energy curve of a system of atoms define the potential energy of the atoms with respect to the inter-nuclear separation. The minimum point of the curve represents the equilibrium bond length of the bond.
The energy of the system depends on the distance between the two interacting atoms.
Looking at the potential energy curve for hydrogen molecule in option D, we can assert that a chemical bond indeed exists between the two atoms of hydrogen and the minimum point of the curve is the equilibrium bond length of the bond.
A common relation between potential energy and internuclear distance when stated, is applicable to the ground states of diatomic and polyatomic molecules.
The graphs that correctly shows the relationship between potential energy and internuclear separation for two hydrogen atoms is option d.The potential energy of two separate hydrogen atoms often becomes lower as they approach each other, and the single electrons on each atom are shared to form a covalent bond.
The bond length is regarded as the internuclear distance where the lowest potential energy is gotten. The strong attraction of each shared electron often stabilizes the system.
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In nature element Carbon is found with different physical properties.Which allotrope of carbon is shown in the figure ? प्रकृति में कार्बन तत्व अनेक विभिन्न भौतिक गुणों के साथ विविध रूपों में पाया जाता है। चित्र में कार्बन के कौन से अपररूप की रचना दिखाई गई है ? *
Captionless Image
ਹੀਰਾ /Diamond/हीरा
ਬਕਮਿੰਸਟਰਫੁਲਰੀਨ /Buckminsterfullerene/बकमिंस्टरफुलेरीन
ਗ੍ਰੇਫਾਈਟ /Graphite /ग्रेफाइट
ਇਨ੍ਹਾਂ ਵਿੱਚੋਂ ਕੋਈ ਨਹੀਂ / None of the above/इनमें से कोई नहीं
Answer:
Graphite
Explanation:
The structure of diamond is similar to that shown, but has a middle layer that is offset from the others. The structure of Buckminsterfullerene is that of a soccer ball, 60 atoms arranged in a 32-faced figure.
The structure shown matches that of graphite.
