[tex] \longrightarrow\sf \pmb {Exothermic \: Reaction}[/tex]
[tex] \tt \green {An \: exothermic \: reaction \: is \: indicated \: by \: writing \: “+Heat” \: or \: “+Heat \: energy” \: or \: “+Energy” \: on \: the \: products \: side \: of \: an \: equation.}[/tex]
Answer: Heat is included as one of the products.
Explanation:
Which statement best describes what occurs during a chemical reaction?
Chemical reactions involve breaking chemical bonds between reactant molecules (particles) and forming new bonds between atoms in product particles (molecules). The number of atoms before and after the chemical change is the same but the number of molecules will change
Answer:
The bonds in reactants break so that elements can rearrange form new products
Explanation:
Help me find out which reaction is balanced
Answer:The answer is c
Explanation:
half equation for oxygen to oxide ions, aluminium ions to aluminium, magnesium to magnesium ions
At what pressure would a 5.32 mol Cl2 sample occupy 5.08 L at 181.59 K? please help!!
Answer: At a pressure of 15.613 atm a 5.32 mol [tex]Cl_{2}[/tex] sample occupy 5.08 L at 181.59 K.
Explanation:
Given: Moles = 5.32 mol
Volume = 5.08 L
Temperature = 181.59 K
Formula used to calculate the pressure is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\P \times 5.08 L = 5.32 mol \times 0.0821 L atm/mol K \times 181.59 K\\P = \frac{5.32 mol \times 0.0821 L atm/mol K \times 181.59 K}{5.08 L}\\= 15.613 atm[/tex]
Thus, we can conclude that at a pressure of 15.613 atm a 5.32 mol [tex]Cl_{2}[/tex] sample occupy 5.08 L at 181.59 K.
5
Which of the following is a factual statement about
hormones?
A They are the sole cause of mood swings
B
They cause boys' and girls' bodies to develop
C
They are a type of blood cell
D They are extremely difficult to deal with
Answer:
They cause boys' and girls' bodies to develop
HELP PLEASE Excluding the noble gas group, how does the number of valence electrons in an element influence it chemical reactivity?
Answer: A. Elements with intermediate numbers of valence electrons are the least reactive.
Explanation: I Quizzed
A simplified model of an electromagnet is shown here, where a loop of wire is placed around an iron nail. The wire is
connected to a battery. A student wants to test the strength of the electromagnet by measuring how many paperclips
the electromagnet can pick up. In order to increase the strength of the electromagnet, some modifications to the
apparatus can be made. Which questions are most relevant to increasing the strength of the electromagnet? Select
ALL that apply.
A)
Will wetting the nail increase the number of paperclips that can
be picked up?
B)
Does insulating the nail increase the number of paperclips that
can be picked up?
C)
Does increasing the current in the battery increase the number of
paperclips that can be picked up?
D)
Will increasing the number of loops of wire around the nail
increase the number of paperclips that can be picked up?
E)
Will positioning the loops of wire closer together on the nail
increase the number of paperclips that can be picked up?
Forces in Nature
Answer:
CDE
Explanation:
If your on USA test perp
The questions are most relevant to increasing the strength of the electromagnet are Does increase the current in .....?, Will increasing the number of loops of wire around the.....? and Will positioning the loops of….? Therefore, option C, D and E are correct.
What are the properties of electromagnet ?The characteristics known as electromagnetic properties determine how quickly a substance will absorb or emit electromagnetic radiations.
We may be familiar with electromagnetic radiations such as radio waves, microwaves, ultraviolet rays, infrared rays, and visible light rays.
Transverse waves characterize electromagnetic radiation.They move across fluctuating magnetic and electric fields so that they are perpendicular to the wave's path of propagation and at right angles to one other.
Thus, option C, D and E are correct.
To learn more about the properties of electromagnet, follow the link;
https://brainly.com/question/15502579
#SPJ6
How to solve for K when given your anode and cathode equations and voltage
Answer:
See Explanation
Explanation:
In thermodynamics theory the Free Energy (ΔG) of a chemical system is described by the expression ΔG = ΔG° + RTlnQ. When chemical system is at equilibrium ΔG = 0. Substituting into the system expression gives ...
0 = ΔG° + RTlnKc, which rearranges to ΔG° = - RTlnKc. ΔG° in electrochemical terms gives ΔG° = - nFE°, where n = charge transfer, F = Faraday Constant = 96,500 amp·sec and E° = Standard Reduction Potential of the electrochemical system of interest.
Substituting into the ΔG° expression above gives
-nFE°(cell) = -RTlnKc => E°(cell) = (-RT/-nF)lnKc = (2.303·R·T/n·F)logKc
=> E°(cell) = (0.0592/n)logKc = E°(Reduction) - E°(Oxidation)
Application example:
Calculate the Kc value for a Zinc/Copper electrochemical cell.
Zn° => Zn⁺² + 2e⁻ ; E°(Zn) = -0.76 volt
Cu° => Cu⁺² + 2e⁻ ; E°(Cu) = 0.34 volt
By natural process, charge transfer occurs from the more negative reduction potential to the more positive reduction potential.
That is,
Zn° => Zn⁺² + 2e⁻ (Oxidation Rxn)
Cu⁺² + 2e⁻ => Cu° (Reduction Rxn)
E°(Zn/Cu) = (0.0592/n)logKc
= (0.0592/2)logKc = E°(Cu) - E°(Zn) = 0.34v - (-0.76v) = 1.10v
=> logKc = 2(1.10)/0.0592 = 37.2
=> Kc = 10³⁷°² = 1.45 x 10³⁷
pls help Which statement is true about the environment of urban areas?
Urban areas have higher temperatures.
Urban areas have few problems with soil erosion.
Urban areas have more rain infiltration into the soil.
Urban areas have less habitat fragmentation.
The statement that is correct about Urban areas is that they have higher temperatures.
Urban Area is a term to refer to cities. Urban areas are characterized by having a developed infrastructure (wide roads, vehicular bridges, wide platforms, tall buildings, residential areas, industrial areas, among others).
Recent studies affirm that urban areas are warmer than surrounding areas; This phenomenon is because the materials with are built buildings, roads, houses, and others, concentrate the sun's rays, increasing the temperature of cities. In addition, the lack of trees deepens this phenomenon, because the trees contribute to cooling by physicochemical processes such as evapotranspiration.
According to the above, it is possible to affirm that urban areas are hotter than their surrounding area because they lack vegetation, and the materials with which it is built contribute to the increase in temperature.
On the other hand, urban areas are characterized by habitat fragmentation, more problems with soil erosion, and less rain infiltration into the soil.
Learn more in: https://brainly.com/question/23587978
Answer:
A) higher temps
Explanation:
help!!!
1. How many grams of Ag+ are present in 2.24 grams of silver
sulfite?
grams Agt.
2. How many grams of silver sulfite contain 1.75 grams of Agt?
grams silver sulfite.
Answer:
1. 0.82 gram of Ag+
2. 4.79 g of Ag₂O₃S
Explanation:
From the given information:
Total amount of Ag₂O₃S = 2.24 grams
Atomic mass of Ag+ =107.86 g/mole
molar mass of Ag₂O₃S = 295.8 g/mole
∴
The mass of the Silver (Ag) in grams is:
[tex]= Total\ amount \ of \ Ag^+ \times \dfrac{107.86 \ g/mol}{295.8 \ g/mol}[/tex]
[tex]=2.24 \times \dfrac{107.86 \ g/mol}{295.8 \ g/mol}[/tex]
= 0.82 gram of Ag+
2.
Here, the total amount of Ag₂O₃S = unknown
Atomic mass of Ag+ = 107.86 g/mole
molar mass of Ag₂O₃S = 295.8 g/mole
amount of Ag+ = 1.75 g
∴
The mass of Ag₂O₃S = [tex]Total \ amount \ of \ Ag^+ \times \dfrac{295.8 \ g/mol}{107.86\ g/mol}[/tex]
[tex]=1.75 \times \dfrac{295.8 \ g/mol}{107.86\ g/mol}[/tex]
= 4.79 g of Ag₂O₃S
how to make 100 ml of 0.001 mM solution with 0.0405mM solution?
Answer:
Measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water
Explanation:
To make 100 mL of 0.001 mM solution from 0.0405mM solution, we need to determine the volume of 0.0405mM solution needed. This can be obtained as follow:
Molarity of stock (M₁) = 0.0405 mM
Volume of diluted (V₂) = 100 mL
Molarity of diluted solution (M₂) = 0.001 mM
Volume of stock solution needed (V₁) =?
M₁V₁ = M₂V₂
0.0405 × V₁ = 0.001 × 100
0.0405 × V₁ = 0.1
Divide both side by 0.0405
V₁ = 0.1 / 0.0405
V₁ = 2.47 mL
Therefore, to make 100 mL of 0.001 mM solution from 0.0405mM solution, measure 2.47 mL of the stock solution (i.e 0.0405 mM) and dilute it to the 100 mL mark with water.
All of the following are examples of human organs EXCEPT the
1.heart
2.eyelashes.
3.skin
4. brain
It for science
Answer:
eyelashes are not a part of the the human organs
g A closed-end manometer was attached to a vessel containing argon. The difference in the mercury levels in the two arms of the manometer was 9.60 cm. Atmospheric pressure was 783 mm Hg. The pressure of the argon in the container was ________ mm Hg. Selected Answer: Incorrect 773 Answers: 882 793 661 773 Correct 96.0
Answer:
Answer: 882mmHg
Explanation:
In a closed-end manometer, the gas added is under a pressure that is measured against atmospheric pressure. The difference in pressure between both gases is equal to the difference in mercury levels. Thus, the pressure of the argon can be:
783 mmHg - 96.0mmHg = 687mmHg
783 mmHg - 96.0mmHg = 879mmHg
Based on the options, the possible answer (The nearest to the second value) is:
Answer: 882mmHg................................................................
Answer:
..............,.,.,.,,..,,.,.,
What is the Molar mass of zinc
Answer:
the molar mass of zinc is 65.38u or 65.38 grams(g).
Consider this reaction at equilibrium:
2BrNO (g) → 2NO (g)+ Br2 (g)
Predict whether the reaction will shift left, shift right, or remain unchanged after each disturbance.
a. NO is added to the reaction mixture
b. BrNO is added to the reaction mixture
c. Br2 is removed from the reaction mixture
d. Pressure is increased
Answer:
a. NO is added to the reaction mixture ⇒ to the left
b. BrNO is added to the reaction mixture ⇒ to the right
c. Br₂ is removed from the reaction mixture ⇒ to the right
d. Pressure is increased ⇒ to the left
Explanation:
The reaction at equilibrium is the following:
2BrNO (g) → 2NO (g)+ Br₂ (g)
The left side is the reactants side (2 BrNO) and the right side is the products side (2 NO + Br₂).
a. NO is added to the reaction mixture
NO is a product, in the right side of the equation. If a product is added, the equilibrium will shift to the opposite side, to the left, to form more reactants and compensate for the addition.
b. BrNO is added to the reaction mixture
BrNO is a reactant, in the left side of the equation. If a reactant is added to a reaction at equilibrium, more product will be formed in compensation. Therefore, the equilibrium will shift to the right.
c. Br₂ is removed from the reaction mixture
Br₂ is a product, in the right side. If it is removed, the system will compensate for the remotion by forming more product, so the reaction will shift to the right.
d. Pressure is increased
Since both reactants and products are in the gas phase, the equilibrium is affected by pressure. If pressure is increased, the equilibrium will shift to the side of the reaction with the fewest number of moles. The reactants side (left) has 2 moles of BrNO while the products side (right) has 3 moles (1 mol NO + 1 mol Br₂ = 3 moles of gas). Therefore, the reactants side has the fewest number of moles, so the equilibrium will shift to the left.
If a balloon has a volume of 1.696 L at a pressure of 2.11 0 atmospheres, what will be the volume of the balloon if the pressure is increased to 5.067 atmospheres?
Answer:
I think that the volume will be 1.414
Explanation:
According to the formula of boyle's law P1 V1 = P2 V2
We have to find V2 so:
V2 = P2/P1 V1
By putting the values:
V2 = 5.06/2.11 * 1.696
V2 = 5.06/3.578
V2 = 1.414
Please give me brainliest, it will mean a lot to me.
What is the volume of nitrogen dioxide (in L) is produced from the complete reaction of 16.87g of lead (II) nitrate at STP?
Given the reaction N2 + 3H2 -->2NH3, what volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia, assuming constant temperature and pressure? How would you calculate the mass in grams of hydrogen chloride produced when 4.9 L of molecular hydrogen at STP reacts with an excess of chlorine gas.?
Why are fossil fuels considered nonrenewable resources?
Answer:
They are considered nonrenewable because they are prehistoric animals that has been extinct therefore can't be renew.
a warm air is rising as cooler air es in to take its place. what is the name for that?
Answer:
convection
hope this helps
have a good day :)
Explanation:
write one other example (other than the one in your note) of ore of the following metals
a) Aluminium
b) Lead
c) Iron
The lattice-like structure of a metal consists of negative metal ions in a "sea" of electrons.
O True
O False
Answer:
True
Explanation:
1:How many moles of ammonia will be produced if 12 moles of nitrogen are used?
2:How many moles of nitrogen are required to react with 6 moles of hydrogen?
3:Honors: If there are 40 moles of nitrogen and 30 moles of hydrogen, what is the limiting reactant? Explain your answer.
4:Honors: What is the mass of hydrogen required to produce 80 g of ammonia?
Please, I really need help, so I can graduate
Answer:
See Explanation
Explanation:
The reaction equation is
3H2(g) + N2(g) -----> 2NH3(g)
1)If 1 mole of N2 yields 2 moles of NH3
12 moles of N2 will yield 12 * 2/1 = 24 moles of NH3
2) 3 moles of nitrogen reacts with 1 mole of nitrogen
6 moles of hydrogen will react with 6 * 1/3 = 2 moles of nitrogen
3) The limiting reactant yields the least amount of product
If 1 mole of nitrogen yields 2 moles of NH3
40 moles of nitrogen yields 40 * 2/1 = 80 moles of NH3
If 3 moles of hydrogen yields 2 moles of NH3
30 moles of hydrogen yields 30 * 2/3 = 20 moles of NH3
Hence hydrogen is the limiting reactant
4) Number of moles in 80g of NH3 = 80g/17g/mol = 4.71 moles
3 moles of hydrogen produces 2 moles of ammonia
x moles of hydrogen produces 4.71 moles of ammonia
x = 3 * 4.71/2 = 7.065 moles of hydrogen
Mass = 7.065 moles of hydrogen * 2 g/mol
Mass = 14.13 g of hydrogen
g A chemical equilibrium exists when: A chemical equilibrium exists when: there are equal amounts of reactants and products. the rate at which reactants form products is the same as the rate at which products form reactants. the sum of reactant and product concentrations equals one mole. reactants are completely changed to products. the rate at which reactants form products becomes zero.
Answer:
the rate at which reactants form products is the same as the rate at which products form reactants
Explanation:
There is still a reaction happening just that the second one happens the opposite happens and keeps it at net 0
8. What is the mass of 4.50 x 1022 Cu atoms?
Answer:
4.7485 g
Explanation:
4.50 x 10^22 Cu atoms * (1 mol Cu / 6.022 x 10^23 Cu atoms) * 63.546 g Cu/(mol Cu) = 4.7485 g
In every mole of Cu, there are 6.022 x 10^23 atoms (Avogadro's number). The molecular weight of copper is 63.546 g/mol.
Which part of the graph represents how much energy the reactants need to gain to become products?
Answer: The answer is F
The answer is F , F shows the amount of energy the reactants need to gain to become products .
What are Potential Energy Diagrams ?
A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.
From the figure attached we can understand the Eₐ is the activation energy reactants need to get converted into products.
Now when we study the figure( potential energy Diagram) given in the question ,
The reactants are energy level shown by G
The total energy required to get converted into products is denoted by H while ,
H - G is the actual energy required which is denoted by F.
Therefore F shows the amount of energy the reactants need to gain to become products .
To know more about Potential Diagram
https://brainly.com/question/12078312
#SPJ2
What is the pH of a solution with a concentration of 7.6 × 10–7 M H3O+?
0.993
6.12
7.88
8.34
Answer:
Ph = 6.12....
here ya go
Explanation:
-
The pH of the solution with a concentration of 7.6 × [tex]10^{-7}M[/tex] [tex]H_{3}O^{+}[/tex]will be 6.12.
What is pH?The pH of water indicates how acidic or basic it is. The scale runs from 0 to 14, with 7 representing neutrality. Acidity is indicated by a pH less than 7, while a pH greater than 7 denotes a base. The relative number of free hydrogen, as well as hydroxyl ions in water, and hydroxyl ions in water is measured by pH .
It is known that ,[[tex]H_{3}O^{+}[/tex]]=[tex][H^{+} ][/tex]
pH can be calculated by the formula:
[tex]pH = -logH^{+}.[/tex]
Now, put the value of hydrogen ion in above equation
pH = -log[7.6×10^{-7}M]
= -log(7.6)-log(10^{-7}
= -0.88+7log 10
= -0.88 +7
= 6.12.
Therefore, the pH of the solution will be 6.12.
To know more about pH click here.
https://brainly.com/question/491373.
#SPJ2
Define, triple covalent bond
Answer:
it's a covalent linkage in which two atoms share three pairs of electrons as in nitrogen molecule or acetylene
which property of metal is used for making utensils??
Answer:
Metals are good conductors of heat. Due to this property metals are used in the preparation of kitchen utensils. Aluminium is good conductor of heat and more over it is corrosion resistent. Due to these properties aluminium is used in making kitchen utensils.
Explanation:
Help plz:)))I’ll mark u Brainliest
Answer:
82gS
Explanation:
2 Fe + 3 S → Fe2S3
↓ ↑
mol → mol
Fe S
[tex]\frac{95 g Fe }{} \frac{1 mol Fe }{55.85 g Fe } \frac{3 mol S }{2 mol Fe } \frac{32.07 g S}{1 mol S} = 82 g S[/tex]