Answers
Answer:
B.
No light
C.
Explanation:
B. Maximum in A, Minimum in B
When a colored filter is placed in the path of white light, the light passes through the filter, is of the same color as that of filter.
So, when the white light passes through the red filter, the red light pass through it.
When red light pass through the green filter, the light passes through the green filter is none, so this is dark.
C.
When the nail is placed in ordinary water, it gets rusted due to the oxygen present in water.
When nail is placed in boiling water which is covered with oil, so the rust is very small quantity as boiling water also contains some oxygen.
When the nail is placed in calcium carbonate, it absorb all the moisture of air and no rusting takes place.
So, maximum rusting in test tube A and minimum rusting is in test tube C.
Related Questions
Which of these could possibly lead to an extinction?
A : adaptation
B : reclamation
C : symbiosis
D : pollution
Answers
Answer:
pollution
as all the other terms mentioned are beneficial for our biodiversity
how many moles are there in a 3.00M solution when you have 1.78L
Answers
Which sentence describes deposition changing the surface of Earth?
Answers
The sentence that describes deposition changing the surface of Earth is a river breaks away rocks to form a canyon.
What is a deposition change?Deposition change is when wind or water eroded the land and the sediments deposit in a place.
A canyon is a landform that is created by erosion by river for a long time.
Thus, the correct option is A. a river breaks away rocks to form a canyon.
Learn more about deposition change
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What should Peru do to improve science?
Answers
Answer:
scientists say the country has many home advantages for good research,but it desperately needs more government interest
give me 3 facts and 3 superstitious about the moon
Answers
Facts:
1. The Moon has no atmosphere
2. The Moon has quakes
3. The Moon is a dusty ball of rock, measuring 3,476km in diameter
Superstitions :
1. Gazing too long at the full moon will bring out one’s inner lunatic.
2. The waxing of a new moon is the best time for sowing seeds, weddings, childbirth, new projects and travel.
3. It is bad luck to see the new moon, for the first time of the night, through glass or tree branches.
Hope this helps and if it does, don't be afraid to give my answer a "Thanks" and maybe a Brainliest if it's correct?
1. The internet connection is so high on the due to laser connection
2.Its the satellite of the Earth
3.It is a very cold place
A 25.0mL sample of 2.0mol/L sodium oxalate is reacted with 30.0mL of 1.50 mol/L copper (II) nitrate solution a student recovers 5.82 grams of precipitate when they perform the reaction.
Write a balenced chemical reaction.
Answers
Answer:
Na2C2O4(aq) + Cu(NO3)2(aq) → 2NaNO3(aq) + CuC2O4(s)
Explanation:
Sodium oxalate, Na2C2O4 reacts with copper (II) nitrate, Cu(NO3)2 producing an insoluble salt. As the reaction is of 2 salts you can know there is an ion exchange reaction where sodium nitrate is produced ans copper (II) oxalate (This salt is the precipitate). The reaction is:
Na2C2O4(aq) + Cu(NO3)2(aq) → 2NaNO3(aq) + CuC2O4(s)Help! Locks at 12
Given the balanced equation representing a nuclear reaction:
Which particle is represented by X?
Answers
Answer is #4 (neutrons)
Explanation:
Total mass before the reaction is 236 amu. The total mass of the two elements is 233 amu. This means that there are 3 amus carried by element X. Looking at the total atomic number of the two elements after reaction, it's 92, the same as the one at the beginning. This means that element X has zero atomic number, which could only be a neutron.
Answer: is 4
Explanation:
I was doing the same one
PLEASE HELP !
(In the column for the other reactants and/or products indicate whether they increase, decrease, or stay the same.)
Chemical Reaction:
A (g) + B (g) ←→ 3C (g)
Blue ← → Clear, Colorless
WHAT ARE THE:
Stress , Equilibrium Shift (right or left) , A (g) , B (g) , C (g) , What color?
1. Add A
2. Add B
3. Add C
4. Remove A
5. Remove C
Answers
Answer:
See Explanation
Explanation:
We must remember that when a constraint such as a change in concentration, pressure or temperature is imposed on a reaction system in equilibrium, the equilibrium position will shift in such as way as to cancel the constraint.
If more of A or more of B is added to the system, the equilibrium position will shift towards the right and the solution becomes clear and colorless.
If C is added to the system, the equilibrium position will shift towards the left and the solution colour turns blue.
If A is removed from the system, the equilibrium position is shifted towards the left and the solution once again turns blue.
If C is removed from the system, the equilibrium shifts towards the right and the solution turns clear and colorless
If you decreased the volume of a sample of gas by a factor of three while maintaining a constant pressure, how would the absolute temperature of the gas be affected?
A gas at 300 K and 4.0 atm is moved to a new location with a temperature of 250 K. The volume changes from 5.5 L to 2.0 L. What is the pressure of the gas at the new location?
What is the partial pressure of 0.50 mol Ne gas combined with 1.20 mol Kr gas at a final pressure of 730 torr?
Answers
**Check for proof photos at the bottom.**
**Answers are in bold.**
__________________________________________________________
If you decreased the volume of a sample of gas by a factor of three while maintaining a constant pressure, how would the absolute temperature of the gas be affected?
✔ it would decrease threefold
A gas at 300 K and 4.0 atm is moved to a new location with a temperature of 250 K. The volume changes from 5.5 L to 2.0 L. What is the pressure of the gas at the new location?
✔ 9.2 atm
What is the partial pressure of 0.50 mol Ne gas combined with 1.20 mol Kr gas at a final pressure of 730 torr?
✔ 215 torr
__________________________________________________________
How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?
✔ it is decreased to one third of its original volume
Why might a rubber raft burst if it is left in the sun on a summer day?
✔ temperature increases, causing interior pressure to increase
__________________________________________________________
Complete the table by filling in the missing information.
✔ pressure, volume A
✔ temperature, moles of gas B
✔ Charles’s law C
✔ V = kT D
✔ temperature, pressure E
✔ P = kT F
✔ number of moles only G
__________________________________________________________
Match one graph shown at right to each of the gas laws named below.
Charles’s law
✔ d
Gay-Lussac’s law
✔ b
Boyle’s law
✔ e
__________________________________________________________
Left answers:
1.31 atm A
0.44 atm B
Right answers:
✔ decreases it
✔ decreases it
0.12 atm C
__________________________________________________________
Explanation:When decreasing a volume while maintaining the same pressure, the temperature will have to decrease. When volume decreases, particles get squished, increasing pressure. But when temperature decreases, particles move slower, decreasing pressure. The lowered temperature decreases pressure, but the decreased volume increases pressure, so pressure is able to stay constant.
About the 3 main gas laws covered in Edge:
Charles's law says that under a constant pressure, when temperature increases, the volume increases, and vice versa. The equation for this law is V₁/T₁=V₂/T₂.Gay-Lussac’s law says that under a constant volume, when temperature increases, the pressure increases, and vice versa. The equation for this law is P₁/T₁=P₂/T₂.Boyle’s law says that under a constant temperature, when volume decreases, pressure increases, and vice versa. The equation for this law is P₁V₁=P₂V₂.Note that P=pressure, V=volume, and T=temperature. When given a problem, plug in the given values into the correct spots and solve for the unknown value.
Here are photos of Edge. I hope this made your day a little easier.
Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state
compare with the temperature at the end of the change?
Temperature vs. Time
140
120
100
Temperature (°C)
ВО
80
40
20
Time (min) →
The temperature is always lower
The temperature is always the same.
The temperature is usually lower
O The temperature is usually higher
O
Answers
Answer:
always the same
Explanation:
e2020
4. Cell size is limited by the
(a) amount of cytoplasm.
(b) cell's ability to get rid of wastes.
(c) the size of the nucleus.
(d) the size of the plasma membrane.
Answers
Answer:
Maybe it's (a) amount of cytoplasm ...
hope its right
What do electrons Do in ionic bond? Do they transfer from metals to no metals or nonmetal to metals?
Answers
Answer:
electrons get transfered from metals to non metals in the formation of ionic bond.
metals have the tendency to lose electrons whereas non metals tend to stabilize by gaining electrons.
In which substance are molecules rigidly arranged?
1) water in a freezer at -2 degrees Celsius
2) water at cup at 22 degrees Celsius
3) water in a pot at 100 degrees Celsius
4) water in a steam engine at 110 degrees Celsius
Answers
Answer:
Water in a freezer at -2 degrees Celsius
which substance is alkali
Answers
Answer:
Alkalis form chemical salts when they are combined with acids. e.g Sodium hydroxide ,Potassium hydroxide and Ammonia
Explanation:
Answer:
a substance which is alkali is a base that is soluble in water.an example is sodium hydroxide.
Do the middle one, will give brainliest
Answers
Answer:
it answer is (B)
the formula of toluene is C6H5CH3
it consists of a benzene ring with methyl group attached to it
A sample of carbon tetrachloride (CCI) contains 3 moles of the substance. How many atoms are there in the sample?
O 1.806 x 1024
05
0 15
O 9.03 x 1024
Answers
Answer:
Number of atoms =1.806×10²⁴
Explanation:
You have the number of moles of Carbon tetrachloride which is n=3
And you are looking for number of atoms that are in the sample, which are represented by the letter "N"
The formula that has both number of moles(n) and number of atoms(N) is written as n=N/Na
Na is called the Avogadros number and it is equal to 6.08×10²³, it never changes(it is a constant)
So you will substitute the number of moles and the avogadros number to you formula, and the only unknown will be the number of atoms which you are looking for
n=N/Na3=N(6.02×10²³)N=1.806×10²⁴ atoms of CClNB: N does not represent the number of atoms only. It may also represent the number of particles or molecules...
The Ksp of SrSO4 is 3.2 × 10–7. What is the equilibrium concentration of sulfate ion in a 1.0-L solution of strontium sulfate to which 0.10 mol of Sr(CH3CO2)2 has been added?
Answers
Answer:
3.2x10⁻⁶M of sulfate ion can be added
Explanation:
The solubility of SrSO4 is:
SrSO4(s) → Sr²⁺(aq) + SO₄²⁻(aq)
Where Ksp is defined as:
Ksp = 3.2x10⁻⁷ = [Sr²⁺] [SO₄²⁻]
The concentration of Sr is:
0.10mol / 1L = 0.10M = [Sr²⁺]
Replacing in Ksp:
3.2x10⁻⁷ = [0.10M] [SO₄²⁻]
[SO₄²⁻] = 3.2x10⁻⁶M of sulfate ion can be added
Which cell part is responsible for energy release?
A. nucleus
B. ribosome
C. mitochondrion
D. Golgi apparatus E. endoplasmic reticulum
Answers
Answer:
mitochondria is responsible for energy
Someone help me pls I need this correct
Answers
Answer:
Outermost layer of skin: Epidermis
Raised line of skin: friction ridges
Fingerprint pattern: Whorl
Small details in ridges: minutia
(I believe this is correct)
2: friction ridge
3: whorl
4: minutia whorl
hope this helps sorry if number 2 is not accurate
I need help fast answering these questions plzzz!! NO LINKS
Answers
Answer:
1. physical property
2. chemical property
3. physical change
hope this helps
Please, I need help with this problem.
Answers
The proportion of the mass of one element to that of another
element is a mass
Answers
Answer:
yes. but next time try to ask well and clear understood questions
The proportion of the mass of one chemical element to that of another chemical element is a mass: ratio.
Mass ratio is also referred to as percent composition by mass and it can be defined as a proportion of the mass of an element to the mass of another chemical element.
Mathematically, mass ratio is calculated by using the following formula;
[tex]Mass \; ratio = \frac{Mass \;of \;element \;A}{Mass \;of \;element \;B}[/tex]
For example, if the mass of Sodium is 10 grams and that of Chlorine is 20 grams. We would calculate the mass ratio as follows:
[tex]Mass \; ratio = \frac{10}{20}[/tex]
Mass ratio = 0.5 grams.
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(reply if you know the answer or get reported) How many atoms are there in 5 grams of silicon?
Answers
Similarly, for one gram atomic weight of silicon with atomic weight of 28 grams, one mole of silicon still contains 6.022 × 1023 silicon atoms.Answer:
Explanation:
hope it helps
Why is creativity important in science?
Answers
In the hydrolysis of p-nitrophenylacetate by chymotrypsin all of the following are correct (mark all the correct answers): Group of answer choices the active site contains a serine residue, an unprotonated histidine, and an unprotonated aspartate residue at pH 7.0 prior to binding the substrate. attack of a water molecule on the acyl-enzyme intermediate yields the second product. the first product is acetic acid. an acetyl-enzyme intermediate forms during the mechanism.
Answers
Answer:
-- the active site contains a serine residue, an unprotonated histidine, and an unprotonated aspartate residue at pH 7.0 prior to binding the substrate.
-- attack of a water molecule on the acyl-enzyme intermediate yields the second product.
-- an acetyl-enzyme intermediate forms during the mechanism.
Explanation:
p-Nitrophenyl acetate is a chemical compound and is used as a substrate in the assays for esterase as well as lipase activity.
Doing hydrolysis of the p-nitrophenyl acetate releases a p- nitrophenol, and its absorbance can be monitored at about 405 nm.
In doing hydrolysis of the p-nitrophenyl acetate by a chymotrypsin, the following holds true :
By hydrolysis, the acetyl enzyme intermediate is formed.an attack of the water molecule on acyl enzyme yields a second productthe site consists of a serine residue, unprotonated aspartate and an unprotonated histidine residue at pHA sample of an unidentified compound contains 29.84% sodium, 67.49% chromium, and 72.67% oxygen. What is the compound's empirical formula? If the molar mass of the molecular formula is 523.96 g/mol, find the molecular formula.
Empirical Formula:
Molecular Formula:
Answers
Answer:
i would help i just dont know sorry
Explanation:
how many moles of H are there in 39.2g of H
Answers
Answer:
39.2 g
Explanation:
because moles = mass / mr (mr of h is 1)
so 39.2/1= 39.2 moles
hope this helps you to understand :)
a bucket of water cooling at 300k produces a change in enthalpy of -300kJ. what is /\ (delta) Ssurr
a. -1 j/k
b. 1 j/k
c. 1000 j/k
d -1000 j/k
Answers
The change in the entropy of the surrounding, ΔSₛᵤᵣ during the cooling process is 1000 J/K (Option C)
What is entropy?Entropy is simply defined as the measure of the degree of the disorderliness of a system. Mathematically, it can be expressed as:
ΔS = ΔH / T
Where
ΔS is the change in entropy of system
ΔH is the enthalpy change
T is the temperature
How to determine the entropy of the system (ΔSₛᵧₛ)Enthalpy change (ΔH) = –300 KJ Temperature (T) = 300 K Change in entropy of system (ΔSₛᵧₛ) =?ΔS = ΔH / T
ΔSₛᵧₛ = –300 / 300
ΔSₛᵧₛ = –1
ΔSₛᵧₛ = –1 × 1000
ΔSₛᵧₛ = –1000 J/K
How to determine the entropy of the surrounding Change in entropy of system (ΔSₛᵧₛ) = –1000 J/KChange in entropy of surrounding (ΔSₛᵤᵣ) =?ΔSsys = –ΔSsur
–1000 = –ΔSsur
ΔSₛᵤᵣ = 1000 J/K
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can someone please solve it it's urgent
Answers
Answer:
This relates to Boyle's Law.
Pressure is inversely related to Volume
Its is an Indirect Relationship. When One increases....The other decreases.
OPTION B IS YOUR ANSWER.
HAVE A GREAT DAY!
A solution contains 2.38 g of magnesium
chloride, MgCl2, in 500 cm3 of solution.
(a) Calculate the number of moles of
magnesium chloride in 500 cm3 of the
solution.
(b) What is the concentration of
(i) magnesium chloride in mol/dm3;
(ii) chloride ions in g/dm3?
Answers
Answer:
a. 0.0250 moles MgCl2
b. i. 0.0500mol MgCl2 / dm3
ii. 3.54g Cl-/dm3
Explanation:
a. In 500cm3, the mass of MgCl2 (Molar mass: 95.211g/mol) is 2.38g. The moles are:
2.38g * (1mol / 95.211g) = 0.0250 moles MgCl2
b. The dm3 are (1000cm3 = 1dm3):
500cm3 * (1dm3 / 1000cm3) = 0.500dm3
Concentration is:
0.0250 moles MgCl2 / 0.500dm3
i. 0.0500mol MgCl2 / dm3
ii. Moles Cl-:
0.0250 moles MgCl2 * (2mol Cl- / 1mol MgCl2) = 0.0500 moles Cl-
Mass Cl- -Molar mass: 35.45g/mol-:
0.0500 moles Cl- * (35.45g / mol) = 1.77g of chloride ions
1.77g Cl- / 0.500dm3:
3.54g Cl-/dm3