Answer:
ΔH>0, ΔS>0, and ΔG<0
Explanation:
Crystalline solid → Gas
ΔG < 0 T as the reaction is Spontaneous The solid is converted into gas so the Entropy will increase as randomness is more in gas than solid, ΔS > 0using Gibbs equation
ΔG = ΔH - TΔS
as ΔG < 0 and ΔS > 0
ΔH - TΔS <0
ΔH < TΔS ⇒ΔH >0
This gives that ΔH will be Positive but it will be less than TΔS. So we need to provide some energy to convert crystalline solid into gas.
A scientist who collects and analyzes DNA from a crime scene is a
Answer:
forensic scientist
Explanation:
forensic science is the discipline in which professionals use scientific means to analyze physical crime evidence. this evidence is then presented in court in order to help determine the innocence or guilt of a specific suspect.
Answer:
Its a forensic scientist :D
Explanation:
I took a test and got it wrong but it showed the right answer and its a forensic scientist
(don't ask how i got it wrong i was rushing!!)
PLEASE HELP!! Circuit A consist of two wires and a battery. Circuit B consist of the same strength battery and the same type of wires, but it also contains a light bulb. Which circuit has more resistance?
Answer:
light bulb B
Explanation:
more resistance
I need the answer to this multiple-choice
If you 0.123 moles of CO2 is placed at 300.1 K and 2.91 atm pressure. Determine its volume.
show with work
Answer:
1.04 L
Explanation:
What are the REDOX and BALANCED EQUATION for:
Aluminum metal and aqueous hydrochloric acid (HCl) will form Aqueous aluminum chloride and hydrogen Gas
Hydrogen peroxide (H2O2) will decompose to hydrogen and oxygen gas
If the hydronium ion concentration of a substance is 1.0 X 10-6 M, what would be the pH of that substance??
Show/Describe your work.
What are the products of photosynthesis
Answer:Glucose, Oxygen and Water
Explanation:
Answer:
Hello i have don this... : )
Explanation:
It is oxygen and glucose
Have a good day im 100% sure this is... i forgot but it is before or after the asexual and sexual lessons
I added a meme for no reason you will only get it if you have read heroes of Olympus
In the reaction of: ????2O4 (g) ⇌ 2????O2(g) If the equilibrium constant is Kc = 0.513 and the initial concentration of ????2O4 = 0.0500 ????. What are the equilibrium concentrations of ????2O4 and ????O2 under these conditions?
Answer:
[N₂O₄] = 0.00411 M
[NO₂] = 0.0918 M
Explanation:
In the reaction of: N₂O₄(g) ⇌ 2 NO₂(g) If the equilibrium constant is Kc = 0.513 and the initial concentration of N₂O₄ = 0.0500 M. What are the equilibrium concentrations of N₂O₄ and NO₂ under these conditions?
Step 1: Given data
Initial concentration of N₂O₄: 0.0500 M
Equilibrium constant (Kc): 0.513
Step 2: Make an ICE chart
N₂O₄(g) ⇌ 2 NO₂(g)
I 0.0500 0
C -x +2x
E 0.0500-x 2x
Step 3: Find the value of "x"
The equilibrium constant is:
Kc = [NO₂]² / [N₂O₄]
0.513 = (2x)² / (0.0500-x)
4x² + 0.513 x -0.02565
We solve for x and we get x₁ = 0.0458942 and x₂ = −0.558894 (neglected).
Step 4: Calculate the concentrations at equilibrium
[N₂O₄] = 0.0500-x = 0.00411 M
[NO₂] = 2x = 0.0918 M
Sonya is studying a nonmetal element. She learns that the element is like other elements in its group because it can bond to form a salt or an acid. She also learns that the element is the most reactive element in its group. Which element is Sonya most likely studying?
-----
sulfur (S)
neon (Ne)
fluorine (F)
iodine (I)
Answer:
I don't know much about chemistry but fluorine us the most reactive halogen and element
Check all that apply
Use tongs to remove
hot items
Touch the surface.
t
Turn off after use
Answer:
1 and 3
Explanation:
i hope this helps it was an instruction on edge
Answer:
It's 1, Use tongs to remove hot items and 2, Turn off after use
Explanation:
On Edge 2021
Steps in a Nerve Impulse diagram
Answer:
..Repolarization. 2
1 Action potential. Unlike a graded potential, an action potential is capable of traveling long distances. ..
3 Hyperpolarization. ..
4 Refractory period.
Explanation:
A mystery element "X” has two stable isotopes X-50 which occurs 40% of the time
and X-60 which occurs 60% of the time. What is the average mass of element "X"?
A-50 amu
B-54 amu
C-56 amu
D-60 amu
Answer:
probaly C
Explanation:
I'm not sure on this one...
What evidence should Mitchell collect to BEST support the second law of thermodynamics?
Answer:
The Second Law of Thermodynamics poses an insurmountable problem for ... More time will make things worse for the Darwinist, not better. ... error fail-safe and proof-reading devices utilized for quality control, assembly ... No one really supports the idea that the sun + non life = life
Explanation:
According to the second law of thermodynamics, the energy of the universe is conserved but the entropy of the universe is continuously increasing.
What is the second law of thermodynamics?The second law of thermodynamics put some restrictions on the direction of heat transfer and attainable efficiencies of heat engines. This law stated that any spontaneously happening process will lead to an escalation in the entropy (S) of the universe.
This law explains that the entropy of an isolated system will never decrease with time. Mathematically, the 2nd law of thermodynamics:
ΔS (universe) > 0
where ΔS of the universe is the change in the entropy of the universe.
The second law of thermodynamics provides the criterion for the feasibility of any physical or chemical process. A physical or chemical process cannot take place unless it must follow both the 1st and 2nd laws of thermodynamics.
Learn more about second law of thermodynamics, here:
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What type of compound is disulfur dichloride?
a. organic compound
b. acid (ionic compound)
c. covalent compound
d. ionic compound
Answer:
Covalent compound
Explanation:
It is formed by covalent bonds, in which the atoms share a pair of valence electrons
What is the mass of CO2 lost at 20 min from the limestone sample?
How much CO2, in moles, was lost at 20 min from the limestone sample?
How much CO3 2- was lost at 20 min from the limestone sample?
Answer:
The mass, CO2 and CO3 from the limestone sample is discussed below in details.
Explanation:
(A) mass loss of sample of limestone after 20 min
= 0.8437g-0.5979g = 0.2458 g
From the given reaction of limestone, 2 mol of the sample gives 2 moles of CO 2.
Therefore
184.4 g ( molar mass of limestone) gives2× 44 g of carbon dioxide.
1 g of sample gives 88/184.4 g of carbon dioxide
Hence 0.2458 g sample gives
= 88/184.4 × 0.2458 g = 0.117 g carbon dioxide
(B) mole of CO 2 lost = weight/ molar mass
= 0.117 g / 44 g/mol =0.0027 mole
(C). 1 mol of limestone contain 2 mol of carbonate ion
From the reaction we know that carbonate ion of limestone is converted into carbondioxide
Hence lost carbonate ion = 0.2458 g
(D) we know that
1 mol limestone contain 1mol CaCO 3
Hence in sample present CaCO 3
= 1mole / 184.4 g × 0.8437 g= 0.00458 mol CaCO3
Calculate the volume of a liquid with a density of 5.45 g/mL and a mass of 65 g.
Answer:
The answer is 11.93 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question we have
[tex]volume = \frac{65}{5.45} \\ = 11.926605...[/tex]
We have the final answer as
11.93 mLHope this helps you
please help 10 points asap
Answer:
opposite
Explanation:
Answer:
opposite
Explanation:
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What is an example of a gas in motion and a fluid in motion?
Answer:
Gas in motion : Vaporization
Examples of fluid flow :
A river flowing down a mountainAir passing over a bird's wingBlood moving through a circulatory systemFuel moving through an engine.Explanation:
What is the orbital notation for Al+3?
O 1s2 2s22p6
O 182 2s2 2p6 352 3p1
O 1s2 2s2 2p6 352 3p5
O 1s2 2s22p6 352 3p6
what is salt
explinnn hhhhhh hh hh
Answer:
salt is a very well known seasoning
Explanation:
hope this helped :)
The reaction of zinc metal and hydrochloric acid produces hydrogen gas and zinc chloride. Write the balanced chemical equation. Phases are optional.
Answer:
Zn + 2HCl -----> ZnCl₂ + H₂
Explanation:
The balanced chemical equation for Zn with hydrogen is Zn + 2HCl ---> ZnCl₂+ H₂.
What is balanced chemical equation?
A balanced chemical equation is one in which number of reactant is equal to number of products. When Zinc reacts with hydrogen it will form zinc chloride and hydrogen gas.
Here, 1 molecules of hydrochloric acid are participating in the process, and 1 molecules of hydrogen are being created.
Therefore, The balanced chemical equation for Zn with hydrogen is Zn + 2HCl ---> ZnCl₂+ H₂.
To learn more about zinc, refer to the link:
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7th grade help me plzzzzz
Answer:
A & B
Explanation:
The answer for the first one is A because the proton is found in the nucleus with the neutron
The answer for the second was is B because the Neutrons, protons and electrons are all subatomic particles, as they are the main particles that make up an atom.
Proton = Positive Charge (+)
Neutron = Neutral charge (=)
Electron = Negative Charge (-)
Answer:
1- positive
2- A
3-A
Explanation:
Solid nickel reacts with aqueous lead (II) nitrate to form solid lead. What is the net ionic equation for this reaction? • Hint: In this reaction, nickel exhibits its most common oxidation state of +2. • Be sure to include the charge for each ion in the net ionic equation. Provide your answer below: (s) + (aq) → *(n)
Answer:
Pb²⁺(aq) --> Ni²⁺(aq)
Explanation:
The equation of the reaction is given as;
Ni(s) + Pb(NO₃)₂(aq) --> Pb(s) + Ni(NO₃)₂(aq)
In writing the ionic equation, we break the aqueous compound into ions. The solid and liquid compounds are ignored.
We have;
Pb²⁺(aq) + NO₃²⁻(aq) --> Ni²⁺(aq) + NO₃²⁻(aq)
Canceling the spectator ions;
Pb²⁺(aq) --> Ni²⁺(aq)
Answer:
Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)
Explanation:
The complete ionic equation of this reaction is
Ni(s)+Pb2+(aq)+2 NO−3(aq)→Ni2+(aq)+2 NO−3(aq)+Pb(s)
The nitrate ions are spectator ions and can be removed from the equation, giving us
Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)
Pls pls pls pls pls pls help
A resistor is placed in a circuit. The voltage of the circuit is changed and the current is measured. The graph seen here shows the data that was collected. Determine the resistance of the resistor in this circuit.
Which energy transformation produces electricity and is least likely to negatively impact the environment?
Generating electricity from a natural gas-fired power plant
Generating electricity from a natural gas-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a coal-fired power plant
Generating electricity from a nuclear power plant
Generating electricity from a nuclear power plant
Generating electricity from a solar panel system
Generating electricity from a solar panel system
electricity from solar panels
Explanation:
All other options produce something after or during the time electricity is made. That something is gas. Not solar
A chemical equation is shown:
Al + O2 A1203
According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction?
6
5
3
2
Answer:
Well the answer of 1 and 3 is WRONG based on the 1 star review and the answer of 3 is wrong too I just took a test with this question.
Explanation:
Sorry...
Answer:
it's 6
Explanation:
I just took the test and got it right
How many grams of heptane are needed to completely react with 106 g of O2?
Answer:
21.9g
Explanation:
The balanced reaction for the combustion of heptane is;
C7H16 + 11 O2 ------> 7 CO2 + 8 H2O
from the balanced reaction,
1 mole of heptane = 11 moles of O2
converting to mass
100g of Heptane = 484g of O2
xg of Heptane = 106g of O2
x = 106×100/484
x = 21.9g
Therefore, 21.9g of heptane is needed to completely react with 106 g of O2
please don't forget to mark brainliest if helpful
Ram has power of 550 watt.What does it mean?
Answer:
for electricity, watts as in back to the future "1.21 jigga watts"!
Explanation:
List the following atoms in order of increasing electronegativity: O, AI, Ca
Answer:
CA, AI, O
Explanation:
Look at a periodic table and locate each element. Note their electronegativity levels.
