Answer:
B. 225 W
Explanation:
Power is the measure of the amount of work done in a certain time frame. It can be found using the following formula.
p=w/t
where w is the amount of work done in joules and t is the amount of time in seconds.
We know that 900 joules of work was done in 4 seconds.
w=900 J
t= 4 s
Substitute these values into the formula.
p=900 J/ 4 s
Divide 900 by 4
900/4=225
p= 225 J/s
1 Joules of work per second (J/s) is equal to 1 Watt (W). Therefore, we can substitute Watts for Joules per second.
p= 225 Watts
The power is 225 Watts, and the correct answer is B.
For the reaction NH4Cl (s)→NH3 (g) + HCl (g) at 25°C, ΔH = 176 kJ/moland ΔS = 0.285 kJ/(mol - K).
What is the ΔG, and will this reaction be spontaneous in the forward direction?
169 kJ/mol; no
-91 kJ/mol; yes
91 kJ/mol; no
91 kJ/mol; yes
Answer:
C: 91 kJ/mol; no
Explanation:
Just took the quiz! :)
The ΔG is 91kJ/mol and the reaction is not spontaneous in the forward direction and the correct option is option 3.
What is Gibbs free energy change?Gibbs free energy, also known as the Gibbs function, Gibbs energy, or free enthalpy, is a quantity that is used to measure the maximum amount of work done in a thermodynamic system when the temperature and pressure are kept constant.
The Gibbs free energy of the system is a state function because it is defined in terms of thermodynamic properties that are state functions.
The change in the Gibbs free energy of the system that occurs during a reaction is therefore equal to the change in the enthalpy of the system minus the change in the product of the temperature times the entropy of the system.
ΔG = ΔH - TΔS
Given,
ΔH = 176kJ/mol
ΔS = 0.285kJ/mol K
T = 25⁰C = 273 + 25 = 298K
ΔG = ΔH - TΔS
ΔG = 176000 - 298 × 285
= 91070 = 91 kJ/mol
Since ΔG is positive, the reaction is not spontaneous in the forward direction.
Therefore, the ΔG is 91kJ/mol and the reaction is not spontaneous in the forward direction and the correct option is option 3.
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State a condition required for a substitution reaction to occur
Explanation:
substitution reaction (also known as single displacement reaction or single substitution reaction) in a chemical reaction during which one functional group in chemical compound is replaced by an other functional group. a good example of a substitution reaction is halogenation .
It is important for _______ to participate in conservation efforts. a. government b. business c. citizens d. all of the above Please select the best answer from the choices provided A B C D
Answer:
D
Explanation: government
business
citizens
The correct answer is option d all of the above.
What are the conservation efforts?Conservation refers to the preservation and care of these resources for future generations. It entails preserving species variety, DNA, and ecosystems, as well as environmental services like nitrogen cycling.Learn more about conservation efforts are:-
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Why is rusted iron an example of an oxidation reduction reaction A. Electrons are exchanged B. Heat is generated C. Iron combines with oxygen D. Iron becomes molten E. Oxygen is used
Answer:
C
Explanation:
Oxygen & water form rust
In a reaction, 25 grams of reactant
AB breaks down into 10 grams of
product A and an unknown amount
of product B. Using the law of conservation of mass, how much does product B weigh?
a. 25 g
B. 10 g
С. It cannot be determined from the given
information.
d
D. 15g
Answer:
D. 15g
Explanation:
The law of conservation of mass states that, in a chemical reaction, mass can neither be created nor destroyed. This means that the amount of matter in the elements of the reactants must be equal to the amount in the resulting products.
In this question, 25 grams of a reactant AB, was broken down in a reaction to produce 10 grams of products A and X grams of product B. According to the law of conservation of mass, the mass of the reactant must be equal to the total mass of the products. This means that 25 grams must also be the total mass of both products in this reaction. Hence, if product A is 10 grams, product B will be 25 grams - 10 grams = 15 grams.
Therefore, product B must be 15 grams in order to form a total of 25 grams when added to the mass of product A. This will equate the mass of the reactant AB and fulfill the law of conservation of mass.
Which statement best describes the process that the diagrams show?
A solid loses kinetic energy to become a liquid and then becomes a gas
A solid gains kinetic energy to become a liquid and then becomes a gas,
Agas loses kinetic energy to become a liquid and then becomes a solid
Agas gains kinetic energy to become a liquid and then becomes a solid
Answer:Agas loses kinetic energy to become a liquid and then becomes a solid
i believe i had this before but where is the graph
Explanation:
please mark this answer as brainlest
B. A solid gains kinetic energy to become a liquid and then becomes a gas
3. Hydrochloric acid is used to clean metals.
The acid reacts with the oxide layer on the surface of the metal, forming a salt and water.
Which word describes the metal oxide?
A alloy
B base
C element
D indicator
Answer:
Base
Explanation:
Acid + Base ⇒ Salt + Water (Neutralization Reaction)
So the substances forming salt and water must be acid and base.
Since HCl is acid so the Metal Oxide would be the base.
How many grams of aluminum oxide would be produced from the reaction of 0.25 grams of aluminum with excess oxygen gas?
Answer:
0.472 grams of aluminum oxide would be produced from the reaction of 0.25 grams of aluminum with excess oxygen gas.
Explanation:
First of all, you should know that the balanced reaction that occurs:
4 Al + 3 O₂ → 2 Al₂O₃
Then, by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts are produced in moles:
Al: 4 molesO₂: 3 molesAl₂O₃: 2 molesBeing:
Al: 27 g/moleO: 16 g/moleThe molar mass of the compounds participating in the reaction is:
Al: 27 g/moleO₂: 2*16 g/mole= 32 g/moleAl₂O₃: 2*27 g/mole + 3*16 g/mole= 102 g/moleThen, by stoichiometry of the reaction, the following amounts of mass react and are produced:
Al: 4 moles*27 g/mole= 108 gO₂: 3 moles*32 g/mole= 96 gAl₂O₃: 2 moles*102 g/mole= 204 g
Now it is possible to apply the following rule of three: if 108 grams of Al produce 204 grams of Al₂O₃, 0.25 grams of aluminum how much mass of Al₂O₃ will it produce?
[tex]mass of Al_{2} O_{3} =\frac{0.25 grams of Al*204 grams of Al_{2} O_{3} }{108 grams of Al}[/tex]
mass of Al₂O₃=0.472 grams
0.472 grams of aluminum oxide would be produced from the reaction of 0.25 grams of aluminum with excess oxygen gas.
Answer:
D
Explanation:
Will Mark Brainly thing please help
Balance this equation. If a coefficient of "1" is required, choose "blank" for that box.
CO + O ₂ → CO ₂
Answer:
2CO + O ₂ → 2CO ₂
Explanation:
CO + O ₂ → CO ₂
Left Side
C = 1
O = 3
Right Side
C = 1
O = 2
So we'll balance the oxygen first
2CO + O ₂ → 2CO ₂
Left Side
C = 2
O = 4
Right Side
C = 2
O = 4
Ok so balancing the O has also balanced the C
What is it called when Earth’s magnetic poles change places?
a.
a strike-slip fault
c.
sea-floor spreading
b.
magnetic reversal
d.
continental drift
Answer:
Its b. Magnetic reversal
Explanation:
Answer:
B
Explanation:
i just did it
How many atoms in 8.9 moles of iron
Answer:
5.3578e+24
Explanation:
1 mole = 6.02 x 10^23
6.02 x 10^23 x 8.9 =
5.3578e+24
what happens to the zebra molecules once they are eaten by the cheetah?
Answer:
All living organisms need food for their body metabolism. Food helps in the provision of basic nutrients for the body’s survival and growth.
When the Cheetah eats the Zebra, enzymes acts on the Zebra molecules and converts it into smaller molecules.
The smaller molecules broken down are then readily absorbed and used by the cells of the Cheetah.
What are these labels?
Answer:
From left to right
Neutral
Acid
Base
Explanation:
So using HSAB theory hard and soft (Lewis) acids and bases.
OH - Is a Hard Base
H+ Strong Acid
Steel:
Propane:
Calcium chloride:
Water:
Answer:
Steel is a metallic bond
Propane is a covalent bond
Calcium Chloride is an Ionic Bond
Water is a covalent bond
Explanation:
ence a material's properties, identify each of the , ionic, covalent, or metallic bonds
Ionic Bonds are where the extra outer electron of one atom transfers to the other atom.
Covalent Bonds are where the outer electron of one atom takes the open path to the nucleus (negative valance) of a 2nd atom.
Metallic Bonds are formed from the attraction between free electrons and fixed positively charged metallic atoms. Metallic bonds extend over the entire molecular structure.
Substance Properties
Steel Conducts electricity as solid and liquid
Propane Low melting point
Calcium Chloride Conducts electricity when dissolved in water
Water Solid form is brittle, melts at 0C
Steel is an alloy of carbon, iron and other things
Propane = C3H8 C4- H+
Calcium Chloride = CaCl2 = Ca2+ Cl-
Water = H2O = OH- and H+
Guys, please help me and tell me how you found the answer!
If a gas has a pressure of 1.69 atm at a temperature of 300 K, what will the pressure change to if the container is cooled to 100 K?
Also
If a gas has a pressure of 715 mm Hg at the temperature of 500 K, what will the pressure change to if the container is heated to 900 K?
Answer:
The First one is: 0.563atm
The second one is: 1.692atm
Hope this helps!
Explanation: Look at Photo Attached
The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm. The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.
Assuming the gas has been following the ideal behavior. According to the ideal gas equation,
PV =nRT
If the same gas has been heated, the n and R will be constant, as well as with the constant volume of initial and final pressure, the relationship to the P and T can be given as:
[tex]\rm \dfrac{Initial\;pressure}{Initial\;temperature}\;=\;\dfrac{Final\;pressure}{Final\;temperature}[/tex]
(a) For the gas with an initial pressure of 1.69 atm, the final pressure will be:
[tex]\rm \dfrac{1.69}{300}\;=\;\dfrac{Final\;Pressure}{100}[/tex]
Final pressure = 0.563 atm.
The change in pressure = Initial pressure - Final pressure
The change in pressure = 1.63 - 0.563 atm
The change in pressure = 1.06 atm.
The pressure has been reduced with the cooling of the container, and the change in pressure has been 1.06 atm.
(b) For the gas at initial pressure 715 mm Hg, the final pressure will be:
[tex]\rm \dfrac{715}{500}\;=\;\dfrac{Final\;Pressure}{900}[/tex]
Final pressure = 1,287 mm Hg.
The change in pressure = Final pressure - Initial pressure
The change in pressure = 1,287 - 715 mm Hg
The change in pressure = 572 mm Hg
The pressure has been increased with the heating of the container and the change in pressure has been 572 mm Hg.
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What is a chemical reaction?
a. a process of bonding substances together
B. a process that leads to have filled valence shells
following the octet rule
C. a process that releases or consumes energy
D. all of the choices
Answer:
D.
Explanation:
this is because in a chemical reaction all 3 of those work.
Answer:
A chemical reaction is defined as per encyclopedia Britannia as a "a process in which one or more substances, are converted to one or more different substances, the products."
So A is correct, B is correct, C is correct.
So that means we choose D as they're all correct.
A planetary explorer vehicle
on Earth weighs 1850
pounds, what would it weigh
on the surface of Neptune,
which has 1.2 times the
gravity of Earth?
A. more than on the Earth
B. less than on the Earth
C. the same as on Earth
Answer:
more
Explanation:
Answer:
A. More than on the Earth
Explanation:
HURRY UP ANSWER MY QUESTION
Why does a balloon filled with gas become smaller when placed in a colder environment?
A.atoms / molecules speed up in the cold and thus push out on the balloon more
B.atoms / molecules slow down at lower temperatures and thus push out on the balloon less frequently and with less energy
C.atoms / molecules slow down in the cold and thus push out on the balloon more
D.atoms / molecules speed up in the cold and thus push out on the balloon less
Previous
Answer:
B
Explanation:
If you remeber a balloon in hot air, it pops. This is because the molecules are moving too fast and need more space to move, thus popping the balloon. If you put a balloon in cold air, then it shrinks, the molecules not moving fast enough and don't need as much space.
In The diagram which part is negatively charged?
• solid Cu
• wire
• salt bridge
• solid Zn
Answer:
Solid Zn
Explanation:
I took the test :-)
In the diagram solid Zn is negatively charged.
When is solid Zn is negatively charged?Zinc is known as a element that acts as a negative electrode based on the fact that it has more negative potential and acts as the anode.
Based on the fact that zinc is a metal, it is known to often forms metallic compounds with other kinds of metals and based on the fact that it also has an ion charge of +2, the zinc ions are referred to as a strong reducing agents and thus do form ionic bonds.
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Use the balanced equation below to answer the question that follows
6 CO2 + 6H2O - CH206 +60,
How many moles of water are needed to produce 4 moles of CH420?-
a.4
b. 6
c. 10
d. 24
For the following compound, determine each element and if the element is a metal or nonmetal. Also determine if the compound has an ionic, covalent, or metallic bond:
NaCl
SO2
CaO
HF
NO2
H2O
An element and an atom are different but related because
a) A particular element is made up of many different types of atoms b) A molecule is the same as an atom
c) An element is made up of all the same type of atom
d) An element is smaller than an atom
Answer:
c) An element is made up of all the same type of atom
Explanation:
Atoms are the smallest unit of an element that consists of protons, electrons and neutrons in its structure. An element is the smallest part of a chemical substance that cannot be disintegrated i.e. it cannot be broken down further.
Atoms and elements are different in many ways but they are connected in the sense that an element contains only one type of atoms. For example, aluminum element is made up of only aluminum atoms. Different atoms form a molecule but same atoms form an element.
The difference of the element and iron should be option c) An element is made up of all the same type of atom.
What are atoms and elements?The atom represents the smallest unit that comprises of protons, electrons, etc.
While on the other hand, the element represents the small part of the chemical substance that should not be disintegrated. Also, it cannot be split. They both should be interlinked.
Therefore, the option c is correct.
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write the balanced standard combustion reaction for the c5h7on3s2
Answer:
4C5H7ON3S2 + 25O2 —> 20CO2 + 14H2O + 6N2 + 4S2
Explanation:
When C5H7ON3S2 under go Combustion, the following are obtained as illustrated below:
C5H7ON3S2 + O2 —> CO2 + H2O + N2 + S2
Now, let us balance the equation. This is illustrated below:
C5H7ON3S2 + O2 —> CO2 + H2O + N2 + S2
There are 3 atoms of N on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of C5H7ON3S2 and 6 in front of N2 as shown below:
4C5H7ON3S2 + O2 —> CO2 + H2O + 6N2 + S2
There are 20 atoms of C on the left side and 1 atom on the right side. It can be balance by putting 20 in front of CO2 as shown below:
4C5H7ON3S2 + O2 —> 20CO2 + H2O + 6N2 + S2
There are 28 atoms on H on the left side and 2 atoms on the right side. It can be balance by putting 14 in front of H2O as shown below:
4C5H7ON3S2 + O2 —> 20CO2 + 14H2O + 6N2 + S2
There are 8 atoms of S on the left side and 2 atoms on the right side. It can be balance by putting 4 in front of S2 as shown below:
4C5H7ON3S2 + O2 —> 20CO2 + 14H2O + 6N2 + 4S2
Now, there are a total of 54 atoms of O on the right side and 6 atoms on the left side
It can be balance by putting 25 in front of O2 as shown below:
4C5H7ON3S2 + 25O2 —> 20CO2 + 14H2O + 6N2 + 4S2
Now, we can see that the equation is balanced.
please help me!!!!!!!! if the temperature of your ice is 32 percent Fahrenheit and your water is 68 Fahrenheit and you mixed the ice and the water together what temperature is your water?
Answer:
36 degrees farenheit
A5.3 * 1012 kg satellite is 1.800 m from another satellite that has a mass of 3.5 x 108 kg. What is the gravitational
force between the satellites?
3.82 x 10N
6.87 x 107N
5.72 % 1014 N
1.03 * 1018 N
Answer:
The gravitational force between the satellites is [tex]3.81\times 10^{10}\ N[/tex].
Explanation:
Mass of satellite 1, [tex]m_1=5.3\times 10^{12}\ kg[/tex]
Mass of satellite 2, [tex]m_2=3.5\times 10^8\ kg[/tex]
Distance between masses is 1.8 m
It is required to find the gravitational force between the satellites. The formula used to find the force between two masses is given by :
[tex]F=G\dfrac{m_1m_2}{r^2}\\\\F=6.67\times 10^{-11}\times \dfrac{5.3\times 10^{12}\times 3.5\times 10^8}{(1.8)^2}\\\\F=3.81\times 10^{10}\ N[/tex]
So, the gravitational force between the satellites is [tex]3.81\times 10^{10}\ N[/tex].
What is the molarity of a NaCl solution with 3.7 moles and 2.3 L?*
Answer:
5.0 molatrity
Explanation:
because i just known
Answer:
Approximately 1.61
Explanation:
Molarity = Moles/Liters
Molariry = 3.7 moles NaCl / 2.3L
Molariry = 1.61
How much less carbon does
natural gas release than
coal?
Answer:
natural gas releases 50 to 60 percent less carbon dioxide than coal
Explanation:
Natural gas is a fossil fuel, though the global warming emissions from its combustion are much lower than those from coal or oil. Natural gas emits 50 to 60 percent less carbon dioxide (CO2) when combusted in a new, efficient natural gas power plant compared with emissions from a typical new coal plant [1].
How many grams are in 0.572 moles of glucose, C6H12O6
Answer:
103.00
Explanation:
1 mole of Glucose
6 C = 6 * 12 = 72 grams
12H = 12 * 1 = 12 grams
6O = 6 * 16 =96 grams
Total = 180 grams
0.572 moles of Glucose
1 mol of glucose = 180 grams
0.572 mols of glucose = x
x = 0.572 * 180
x = 103.00 grams
15. What is the name of Fl-?
A)Fluorous ion
B)Fluorine
C)Fluoride ion
D)Fluorine ion
Answer:
C: Flouride Ion
4. If 175 undecayed nuclei remain from a sample of 2800 nuclei, how many half-
lives have passed? (Show your work.) *
Your answer
Answer:
X = 4
Explanation:
Start 2800
End 175
175 = 2800x(0.5)^X
175/2800 = 0.5^X
0.0625 = 0.5^X
log(0.5 x) = log(0.0625)
x · log(0.5) = log(0.0625)
-0.301x = -1.204
x = -1.204/-0.301
x = 4
