Answer:
42.9%
Explanation:
the total number of coins is 15+14+6 = 35
so to find the % of pennies, divide the number of pennies by the total number of coins and times it all by 100
15/35 x 100 = 42.9%
The percentage of pennies is 42.85 %.
We have a collection of coins.
We have to find the percentage of pennies in the collection.
What is dime?One tenth of a United States dollar is labelled as dime.
According to the question -
Number of pennies n[p]= 15
Number of dimes n[d] = 14
Number of quarters n[q] = 6
Total number of coins = n[T] = n[p] + n[d] + n[q] = 35
% of pennies can be calculated using -
(n[p] / n[T]) x 100 = (15/35) x 100 = 42.85%
Hence, the percentage of pennies is 42.85.
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If 2.5 moles of sulfur dioxide are created, how many moles of oxygen are necessary?
Carbon-14 is used in radiocarbon dating.
The half-life of carbon-14 is 5.73E3 years. If a sample of carbon-14 has an activity of 0.350 Ci, what is the difference in activities between this sample and the same sample after 1.719E4 years?
Answer:
0.30625 Ci
Explanation:
From the question given above, the following data were obtained:
Half-life (t½) = 5.73E3 years
Original activity (Nₒ) = 0.350 Ci
Time (t) = 1.719E4 years
Difference in activities =?
Next, we shall determine number of half-lives that has elapse. This can be obtained as follow:
Half-life (t½) = 5.73E3 years = 5.73×10³ years
Time (t) = 1.719E4 years = 1.719×10⁴ years
Number of half-lives (n) =?
n = t / t(½)
n = 1.719×10⁴ / 5.73×10³
n = 3
Thus, 3 half-lives has elapsed.
Next, we shall determine the activity after 1.719E4 years. This can be obtained as follow:
Original activity (Nₒ) = 0.350 Ci
Number of half-lives (n) = 3
Activity remaining (N) =?
N = 1/2ⁿ × Nₒ
N = 1/2³ × 0.350
N = 1/8 × 0.350
N = 0.125 × 0.350
N = 0.04375 Ci
Finally, we shall determine the difference in activities. This can be obtained as follow:
Original activity (Nₒ) = 0.350 Ci
Activity remaining (N) = 0.04375 Ci
Difference in activities =?
Difference in activities = Nₒ – N
Difference in activities = 0.350 – 0.04375
Difference in activities = 0.30625 Ci.
Which of the following BEST supports the Big bang theory of the origin of the universe?
Answer: first one
Explanation:
S someone help please!!!!
Answer:
4) south 5) true Explanation:
What is the limiting reactant in a chemical reaction?
A. the reactants that runs out first
B. the product formed first
C. the reactant that slows the rate of reaction
D. the product formed in smallest quantity
What is electro-magnetic radiation?
It is a kind of radiation including visible light ,radio waves, gamma rays, and x-rays in witch electric and magnetic fields vary simultaneously. Hope that helps :)
1.The splitting of a heavy, unstable nucleus into two lighter nuclei is called _____.
a. Fission
b. Fusion
c. Radioactive Decay
d. Isotopes
Answer:
A) Fission
Explanation:
Fission is the splitting of a heavy, unstable nucleus into two lighter nuclei, and fusion is the process where two light nuclei combine together releasing vast amounts of energy.
This is my question.............
Answer:
-3.15 °Celsius I think.
Answer:
-3 C
Explanation:
When salt dissolves in water, the water molecules are attracted by dissolves salt particles. This attraction is called ?
When salt dissolves in water, the water molecules are attracted by dissolves salt particles. This attraction is called dissociation.
Hope this helps you. Do mark me as brainliest.
The attraction of salt particles to water is called adhesion.
ADHESION:Adhesion is the attraction of water molecules to unlike particles i.e. not water. Adhesion can also be defined as the attraction between two unlike molecules or particles. According to this question, salt dissolves in water when water molecules are attracted by dissolved salt particles. This means that the attraction is between two unlike particles (water and salt).Therefore, the attraction of salt particles to water is called adhesion.
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10. A tracer is a radioactive element whose pathway through which a chemical reaction can be followed. Tracers are commonly used in the medical field and in the study of plants and animals. Radioactive Iodine-131(I131) can be used to study the function of the _____ gland assisting in detecting disease.
a. Adrenal
b. Salivary
c. Pituitary
d. Thyroid
Copper reacts with silver nitrate to produce silver and copper(II) nitrate according to the equation below: Cu + 2AgNO3 →Cu(NO3)2 + 2Ag Calculate the number of moles of copper(II) nitrate produced when 5 moles of copper react. Type your answer as a number with 1 significant figure. Make sure to include the correct units in your answer. Units are a type of measurement i.e. gram (g) or mole (mol). Do not include the chemical formula in your answer. Answer:
Answer:
[tex]5\; \rm mol[/tex] of [tex]\rm Cu(NO_3)_2[/tex] would be produced (assuming that reaction does not run out of [tex]\rm AgNO_3[/tex] until all the [tex]\rm Cu[/tex] was converted.)
Explanation:
Make sure that the equation for this reaction is indeed balanced:
[tex]\rm Cu + 2\, AgNO_3 \to Cu(NO_3)_2 + 2\, Ag[/tex].
The coefficient of [tex]\rm Cu[/tex] and [tex]\rm Cu(NO_3)_2[/tex] are not shown. That implies that the coefficient of both species would be [tex]1[/tex]. In other words, the actual equation for this reaction should be:
[tex]\rm 1\; Cu + 2\; AgNO_3 \to 1\; Cu(NO_3)_2 + 2\; Ag[/tex].
Coefficient of [tex]\rm Cu[/tex] in this equation: [tex]1[/tex].
Coefficient of [tex]\rm Cu(NO_3)_2[/tex] in this equation: [tex]1[/tex].
Thus, the ratio between the coefficient of [tex]\rm Cu(NO_3)_2[/tex] and that of [tex]\rm Cu[/tex] would be [tex](1 / 1 ) = 1[/tex].
Assume that [tex]\rm Cu[/tex] is the limiting reactant of this reaction (that is: this reaction runs out of [tex]\rm Cu\![/tex] before running out of any other reactant.) This coefficient ratio would be equal to the ratio between:
[tex]n(\rm Cu(NO_3)_2)[/tex], the number of moles of [tex]\rm Cu(NO_3)_2[/tex] produced, and[tex]n(\rm Cu)[/tex], the number of moles of [tex]\rm Cu[/tex] consumed.Hence, under the assumption that [tex]\rm Cu[/tex] is the limiting reactant:
[tex]\displaystyle \frac{n(\rm Cu(NO_3)_2)}{n(\rm Cu)} = \frac{\text{coefficient of $\rm Cu(NO_3)_2$}}{\text{coefficient of $\rm Cu$}} = \frac{1}{1} = 1[/tex].
The question states that [tex]5\; \rm mol[/tex] of [tex]\rm Cu[/tex] was available. That is: [tex]n({\rm Cu}) = 5\; \rm mol[/tex]. Assume that [tex]\rm Cu\![/tex] is indeed the limiting reactant.
[tex]\begin{aligned} n({\rm Cu(NO_3)_2}) &= \frac{n(\rm Cu(NO_3)_2)}{n(\rm Cu)} \cdot n(\rm Cu) \\ &= 1 \times (5\; \rm mol) = 5\; \rm mol\end{aligned}[/tex].
Hence, under this assumption, [tex]5\; \rm mol[/tex] of [tex]\rm Cu(NO_3)_2[/tex] would be produced.
25 POINTS PLS ANSWER
Through which gas in the table do sound waves travel the fastest?
A. Ammonia Speed of sound 415
B. Air(dry) Speed of sound 346
C. Methane Speed of sound 450
D. Nitrous oxide speed of sound 263
Answer:
The answer would be methane if the problem is asking for the fastest
Explanation:
I hope this helps answer your question
:D
Answer: Methane
Explanation:
Took the quiz and got it right
On a distance-time graph, a horizontal line indicates that the speed is
A. Increasing
B. Decreasing
C. Slow
D. Zero
Answer:
C
Explanation:
The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large ________ peaks.
Answer: M-18
Explanation:
The mass spectra of alcohols often fail to exhibit detectable M peaks but instead show relatively large __M-18___ peaks.
Mass spectroscopy is used to determine the molecular mass and molecular formula of a sample.
When the mass spectra of alcohols do not show detectable M peaks, they show relatively large M-18 peaks.
What do lysosomes and Golgi bodies have in common
Answer:
they're examples of cell organelles
Explanation:
because it is ♥╣[-_-]╠♥
helppp nowwww plsss!!!
Answer:
it is D
Explanation:
A tree for one is a renewable resource, but. It said "farmed trees" therefore the best way to farm trees it well, to farm them. But to sustainably farm them you would need to replace what you destroyed to be able to keep farming in the future.
Answer:
New trees are planted to replace those that are cut down is the correct answer.
have a nice day! (^o^)
In what state of matter is the substance in at 200 C and 30 atm
Combustion of Propane Gas
C2H2 +02 →CO, +H₂O
Determine the coefficient of propane (C3H8) of the above reaction *
Answer:
15
I may be wrong worked it out in my head
Name of SiO3? Please hurry lol
How do different factors affect solubility? Check all of the boxes that apply.
Increasing temperature decreases the solubility of gases.
Stirring increases the solubility of solids.
Increasing pressure increases the solubility of liquids
Decreasing temperature decreases the solubility of solids.
Increasing pressure increases the solubility of gases.
Decreasing the amount of solvent decreases the solubility of solids, liquids, and gases
Answer:
Dear, your answer is
solubility is affected by current concentration, mechanical disturbance, temperature and pressure. So the answers are:
- Increasing temperature decreases the solubility of gases.
- Stirring increases the solubility of solids.
- Increasing pressure increases the solubility of gases.
- Decreasing the amount of solvent decreases the solubility of solids, liquids, and gases.
Answer:
A,D,E
Explanation:
edge 2020
What information does an energy diagram give?
A. It shows the transfer of potential energy to kinetic energy.
B. It shows how concentrations of reactants affect the energy.
C. It shows the rate of the reaction as a function of time.
D. It shows the energy requirements needed in order for a reaction to
occur.
The information from diagram shows the energy requirements needed in order for a reaction to
occur.
What is Collision theory?The collision theory states that each and every chemical reaction can occur between particles when the molecules collide each other.
The collision between particles is necessary but it is not sufficient for a reaction to take place. The collisions must be effective.
It is necessary to know the exact nature of an effective collision since this indicates whether particles react with each other and form new products.
According to collision theory, the reaction occur when molecules collide and molecules have sufficient activation energy to cross energy barrier.
Greater the energy, greater will be number of collision. Lesser energy, lesser will be number of collision.
Thus, the given energy diagram shows about the energy required for a reaction to take place.
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Answer: D) it shows the energy requirements needed in order for a reaction to occur.
What is the Empirical Formula when the Molecular Formula is Sb17Br21
Difference Between Empirical and Molecular Formulas. The key difference between empirical and molecular formulas is that an empirical formula only gives the simplest ratio of atoms whereas a molecular formula gives the exact number of each atom in a molecule. In chemistry, we often use symbols to identify elements and molecules.
Hope I helped :)
: Tell me about the best science experience you've ever had in your entire life in any science class
Answer:
Well, considering it's asking about a personal experience you should answer it but ill answer using one of mine.
Explanation:
TW: I AM TALKING ABOUT HUMAN ORGANS AND SEX
During my 7th-grade science class, we were talking/learning about male and female reproductive systems. One day going into class my teacher was standing over a big black bag and something was in it. Everyone was confused but we all sat down, my teacher explained that she has canceled our test. Everyone was happy including me, but she explained that if everyone could say what everything was called and where it was located we would get an A. At that moment she pulled the Black trash bag away and what was under the bag was 2 reproductive organs a Male and a Female one. Most of the girls started gagging and hid under the table (scared it was going to chase them or something) all the guys seemed so amazed. Anyways the weirdest part was when we were touching and saying what is what and what each thing does (with gloves on) one of the dudes thought it would be an amazing idea if he took the penis and put it inside of the uterus. (representing sex) Everyone was disgusted but my teacher said that in most situations that would be disrespectful but in this case she allowed it, and for the rest of the lesson she talked about how the baby forms and why we should have sex until we are 18.
That is my weird/ best science experience ive ever had.
hellpp
Directions: Write True if the statement is correct, and false if it is incorrect.
1. The molecular formula can be calculated from the empirical formula if the molar
2. The molar mass represents the total mass, or 100 % of the compound.
mass is unknown.
3. Molecular formula gives the relative number of atoms of each element in the compound. 4. We can obtain the molecular formula from the empirical formula if we know the
molecular weight of the compound.
5. If a compound's chemical formula cannot be reduced any more, then the empirical formula is the same as
the molecular formula.
Answer:
Explanation:I think that there should be no explaing and straight to the showing.
what happens when carbon dioxide is passed through water?
Answer:
it results in the formation of a salt called calcium carbonate and the solution becomes or appears to be milk-like. It is because calcium carbonate is insoluble in water.
1. Is the charge of nucleus positive, negative
or neutral?
What about the charge of an atom?
Answer:
nucleus contains protons and atom is neutral
Explanation:
as atom contains equal amount of protons and electrons
What type of molecule provide cells with energy
A- carbohydrate
B- nucleus acid
C- protein
D- water
Answer:
Explanation:
C other awnser is correcto
Answer:
The correct answer is C-Protein
Explanation:
Trust me bro, I know things ;)
Given 25.43 g of O2 gas, how many liters of gas will you have at STP?
Answer value
Given :
Mass of O₂, m = 25.43 g.
To Find :
How many liters of gas will you have at STP.
Solution :
Molecular mass of O₂, M.M = 2 × 16 gram/mole
M.M = 32 gram/mole
Number of moles is given by :
n = m/M.M
n = 25.43/32 mole
n = 0.79 mole
Hence, this is the required solution.
Some light energy can be seen and some cannot be seen with the unaided eye.
There is one type of light energy that is virtually everywhere in most American cities, but it is invisibl
wavelength so long that it can pass right through buildings, and even through human beings, withou
is used to transmit information long distances, since very little interferes with it, and it can be easily
Humans have used this type of light energy for many years to transmit and receive many different ty
technology to use it is so widespread that it is in almost every modern car, truck, and home.
What type of light energy is this?
A.
radio
Св.
ultraviolet
C
gamma
D. X-ray
define and explain sublimation and name the substance that sublime directly on heating
Answer:
Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state. ... So, all solids that possess an appreciable vapour pressure at a certain temperature usually can sublime in air (e.g. water ice just below 0 °C).
I hope it's helpful!