Answer:
i think its B
Explanation:
When an object vibrates, it causes movement in surrounding air molecules. These molecules bump into the molecules close to them, causing them to vibrate as well. This makes them bump into more nearby air molecules. This “chain reaction” movement, called sound waves, keeps going until the molecules run out of energy
hello people ~
Select the correct option from the given statements.
A. Polymers cannot form fibres
B. Polymers can be both natural and synthetic
C. Polymer is a natural substance
D. Polymer is a synthetic substance
Answer:
Polymer can be both natural and synthetic
Explanation:
Natural polymers are found from nature like silk and woolArtificial polymers are made in lab. such as polyester ,nylonA rock falls from a cliff and travels downward for 6 seconds before striking the ground. How fast was the rock moving when it hits the ground? Assume there is no air resistance.
Given parameters:
duration of fall = 6s
Unknown:
Speed of the rock before it hits the ground = ?
Solution:
To solve this problem, we apply one of the appropriate motion equations;
V = u + gt
Where V is the final velocity
u is the initial velocity
t is the time taken
g is the acceleration due to gravity = 9.8m/s²
The initial velocity is 0;
So;
V = gt
Input the parameters and solve for V;
V = 9.8 x 6 = 58.8m/s
The velocity before hitting the ground is 58.8m/s
Calculate the pH during the titration of 30.00 mL of 0.1000 M NaOH(aq) with 0.1000 M HCl(aq) after 18.51 mL of the acid have been added.
The pH during the titration 30.0 mL OF 0.1000 M NaOH(aq) with 0.1000 M HCl(aq) of after 18.5 mL of the acid is added is : 12.38
Calculate the pH value during the titrationFirst step : Determine the number of moles
Number of moles of NaOH = 0.1000 M * 30.00 mL = 3.0 mmol
Number of moles of HCl = 0.1000 M * 18.5 mL = 1.85 mmol
The net moles of NaOH = 3.0 mmol - 1.85 mmol = 1.15 mmol
Next step :
The total volume of the solution = 30.00 + 18.51 = 48.51 mL
[ NaOH ] = [ OH⁻ ] = net moles / total volume
= 1.15 mmol / 48.5 mL = 0.023711 M
Final step : Determine the pH value
pOH = – log[OH⁻] = – log ( 0.023711 )
= 1.625
Therefore :
pH value = 14 - pOH
= 14 - 1.625 ≈ 12.38
Hence we can conclude that The pH during the titration of after 18.5 mL of the acid is added is : 12.38
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When Na, K, and Mg are arranged in increasing order of atomic radius (smallest first), which
order is correct? *
(10 Points)
A. K Mg, Na
B. Na, Mg, K
C. Na, K Mg
D. Mg, Na, K
Answer:
b) Na, Mg, K
Hope it helps you
chemistry is a natural science that deals with the study of?
You went to the market one day. write about an incident that happened there
Answer:
You could write about someone stealing something
Explanation:
And further explain the panic you felt and how the atmosphere changed
How many of the grandsons have the disorder? 1 2 3 4
Is male circle or square? and is the disorder black or white?
Answer:2 duce dose
Explanation:
jit you see the picture now vote
hello people ~
One of the following processes does not involve a chemical reaction, that is:
(a) Melting of candle wax when heated
(b) Burning of candle wax when heated
(c) Digestion of food in your stomach
(d) Ripening of banana
Answer:
A.
Explanation:
The melting of wax is just a physical change, not a chemical one, since melted wax can still reharden and go back to its original state. All the other choices are non-reversible, chemical changes.
Hopefully this helps- let me know if you have any questions!
Answer:
Melting of candle wax when heated
Explanation:
So what's the difference
Physical reaction is reversibleChemical reaction is irreversibleWe can get candle wax back when we melted it so it's physical reaction
True or false: every time energy is transferred into a substance it is going to change phases or state
Answer: True
Explanation: Transferring energy to or from a substance can change its state. Heating a substance in the solid state will cause it to melt, which changes it to the liquid state. Continued heating will cause the substance to evaporate or boil, which changes it to the gas state.
Some substances in the solid state can change straight to the gas state. This process is called sublimation.
A substance in the gas state condenses when it is cooled, which changes it to the liquid state. Continued cooling causes it to freeze, which changes it to the solid state.
Where is DNA found?
A. Gorgi body
B. Vacuole
C. Cell membrane
D. Chromosomes
Answer:
D. Chromosomes
Explanation:
The DNA is found in the nucleus of each cell. It is in "thread-like" structures, which are called "D. Chromosomes."
How many grams are in 5.00 moles of sodium carbonate?
Answer:
530 g
Explanation:
1 mole of Sodium Carbonate = 106g
5 moles = 106*5 = 530g
What would be the effect on the boiling point if you decrease the pressure over a liquid?.
Answer:
The boiling point will be reduced
If a car can go from 0 to 60 mi/hr in 8.0 seconds, what would be its final speed after 5.0 seconds if its starting speed were 50 mi/hr?
a=
vf=
vi=
t=
Answer:
87.5 mi/hr
Explanation:
Because a = Δv / Δt (a = vf - vi/ Δt), we need to find the acceleration first to know the change in velocity so we can determine the final velocity.
vf = 60 mi/hr
vi = 0 mi/hr
Δt = 8 secs
a = vf - vi/ Δt
= 60 mi/hr - 0 mi/hr/ 8 secs
= 60 mi/hr / 8 secs
= 7.5 mi/hr^2
Now that we know the acceleration of the car is 7. 5 mi/hr^2, we can substitute it in the acceleration formula to find the final velocity when the initial velocity is 50 mi/hr after 5 secs.
vi = 50 mi/ hr
Δt = 5 secs
a = 7.5 mi/ hr^2
a = vf - vi/ Δt
7.5 = vf - 50 mi/hr / 5 secs
37.5 = vf - 50
87.5 mi/ hr = vf
Which type of glassware should you use to make this solution, assuming that the accuracy of the concentration is important
Pipettes and volumetric flasks are types of glassware to be used where accuracy of the concentration is important.
What are Glasswares?These are usually made of glass and are involved in scientific processes in the laboratory.
Glasswares such as Pipettes and volumetric flasks have standard readings which ensures that the accuracy of a measurement is guaranteed.
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Some1 please answer these questions in stuck
the reactions at the cathode:
1. the reduced active metal is water, other than that the metal will be reduced
2. H⁺ of the acid will be reduced
the reactions at the anode:
1. if the electrodes are not inert then the metal is oxidized
2. If inert then:
a. OH⁻ from the base will be oxidized
b. The halogen metal will oxidize
1. HCl
H⁺ of the acid will be reduced
Cathode: 2H⁺(aq) + 2e⁻ ⇒ H₂(g)
The halogen metal will oxidize
Anode: 2Cl⁻(aq) ⇒ Cl₂(g) + 2e⁻
2. NaNO₃
Na : active metal, water reduced
Cathode: 2H₂O + 2e ⇒ 2OH- + H₂
NO₃: oxyacid, water will be oxidized
Anode: 2H₂O ⇒ 4 H + + O₂ + 4e
3. CuCl
Cu : not active metal
Cathode: Cu²⁺ (aq) + 2e ⇒ Cu (s)
Cl : The halogen metal will oxidize
Anode: 2Cl⁻ (aq) ⇒ Cl₂ (g) + 2e
what is the mass of one mole of carbon-12?
Answer:
Hello
12 grams
The mass of one mole of carbon-12 atoms is 12 grams.
Hope it helps You.....
Explanation:
Tina used two examples to represent two different states of matter.
Example 1: People seated in a packed auditorium
Example 2: People walking in and out of an auditorium
Which statement is correct?
Example 1 represents a gas and Example 2 represents a solid.
Example 1 represents a liquid and Example 2 represents a gas.
Example 1 represents a gas and Example 2 represents a liquid.
Example 1 represents a solid and Example 2 represents a gas.
Answer:
Example 1 represents a solid and Example 2 represents a gas.
Explanation:
Solids usually have closely packed molecules and gas molecules usually exhibit constant random motion.
a rock weighing 26.0 is placed in a graduated cylender displacing the volume from 13.2ml to 25.3ml what is the density in g/cm3
Answer:
m=26.0 g
v₁=13.2 mL
v₂=23.5 mL
p=m/(v₂-v₁)
P=26.0/(23.5-13.2)=2.524 g/cm³
Explanation:
hope this helps!
have a good day!
A small crystal is added to a solution and it sinks to the bottom of the beaker. What can this tell you about the original solution?
A. It is saturated, becaues the crystal will not sink to the bottom of the beaker.
B. It is supersaturated, because the crystal sank to the bottom of the beaker.
C. It is saturated, because when the crystal was added to the beaker, the entire solution turned into a solid.
D. It is unsaturated, because the crystal did not dissolve in the solution.
Answer:
answer is a supersaturated
Explanation:
Lab Report: Solubility
Please!! Quick hurry!!
Answer:
degree to which a substance dissolves in a solvent to make a solution
is this ok
Answer:
Have Fun
Explanation:
a. Give the name of the element represented
b. Write the electron configuration
c. Identify the number of valence electrons
d. If this atom becomes a 1-ion, what would the electron configuration be?
Answer:
1)Br
2)Ar[4s,3d,4p1]
3) 7e
4) kr
Which substance is completely consumed in a chemical reaction?.
If a mineral with a density of 6 g/cm3 is broken into 3, what is the density of each new piece?
A. 2 g/cm^3
B. 6g/cm^3
C. 18 g/cm^3
D. 12 g/cm^3
Answer:
If a mineral with a density of 6 g/cm3 is broken into 3, the density of each new piece is 6 [tex]\frac{g}{cm^{3} }[/tex]
Explanation:
Density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. In other words, density is the property that matter, whether solid, liquid or gas, has to compress into a given space, the amount of mass per unit volume.
As density is a physical property of matter that is defined as the ratio of an object's mass to its volume, each material or substance has its own density regardless of its size because the ratio between mass and volume is the same.
If a mineral with a density of 6 g/cm3 is broken into 3, the density of each new piece is 6 [tex]\frac{g}{cm^{3} }[/tex]
Describe 3 ways rocks make our lives easier?
Answer:
Geology in everyday life is not restricted to resources. It is also about hazards and risk associated with rock falls, radon, landslides, quick clay, landslides and earthquakes. Geology is detective work. Geology helps us understand climate change in the past, which may help us predict future scenarios.
Explanation:
We have that for the Question "describe 3 ways rocks make our lives easier?" it can be said that 3 ways rocks make our lives easier is
MetalsChalk(inscriptions)Jewelry
From the question we are told
Describe 3 ways rocks make our lives easier?
Generally
There are many ways that rocks help us a human every day but these as very distinnctive 3
MetalsMetals are made from rocks,Rocks are melted and used to make metals using
variant method
Chalk(inscriptions)Rocks have for the longest time helped us in representation of words and letter,inscriptions in general over the years
JewelryRocks are the source of the worlds most renounced jeweries as the beauty are priced highly
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1. Write formulas for the following compounds:
a. magnesium chloride, magnesium bromide, magnesium hydroxide, magnesium sulfide
b. calcium chloride, calcium bromide, calcium hydroxide, calcium oxide, calcium cyanide, calcium sulfide
2. Write formulas for the following compounds:
a. sodium hydroxide, sodium cyanide
b. ammonium cyanide
c. barium chloride, barium hydroxide, barium cyanide, barium oxide, barium sulfide
Answer:
=> The formulas are written above .
Explanation:
hope it's helpful
When did time begin?
Did we invent math or did we discover it?
Where does a thought go when it's forgotten?
Do we have free will or is everything predestined?
Is there life after death?
Is it really possible to experience anything objectively?
What are dreams?
What is the goal of humanity?
those r deep questions.. it all depends on if ur religious and if so wht that religion is
Who ever is reading this:
I love u.
U matter.
The world needs u
hang in there ik it may be bad but u deserve the world <3
ur beautiful no matter ur shape, size, color, gender.. anything
don't give up bby i need u to live.
i wish i could take everyones problems so yall wouldn't have to have em but i cant so just know ily and if anyone needs to talk u can talk to me
Pls pass this on. Everyone deserves to know this. ♥️♥️
just copy and paste its not hard pls this could save someones life
honestly if u need to talk i would love to listen
. which © substance describe the similar chemical the of composition?
Explanation:
write a news story using the clues given below
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that.
Answer:
When the glass rod is rubbed with a silk cloth, The glass quickly loses electrons, and the silk takes the electrons out of the glass rod. So after rubbing, the glass rod becomes positively charged and the silk gets negative charge. So glass acquires a greater order than silk as electron losses.
Explanation:
Observe the given picture, why do you think the chain changes its composition? Explain your answer in the discussion forum.
Since rusting is a chemical change, the chain changed its composition as a result of oxidation of iron to hydrated iron(iii) oxide
What are chemical changes?Chemical changes are changes which occur as a result of chemical reactions which occur in substances resulting in the production of new substances.
An example of a chemical change is rusting of iron.
Rusting of iron occurs as a result of the oxidation of iron when exposed to air and water.
The picture shows rusting of iron.
Therefore, the chain changed its composition as a result of oxidation of iron to hydrated iron(iii) oxide.
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Which statement best describes the role of the skeleton?
O provides excretion
O gives shape and support to the body
O helps our heart to beat
O gets rid of solid waste
Answer:
gives shape and support to the body
Answer:
Gives shape and support to the body
Explanation: