do you have some examples or options to answer ?
The element copper with a relative atomic mass of 63.55 contains atoms of mass numbers 63 and 65. Calculate the fraction of each isotope.
Explanation:
Difference between 63 and 65 = 2.
(63.55 - 63) / 2 * 100% = 27.5%.
(65 - 63.55) / 2 * 100% = 72.5%.
Hence there is 72.5% of the isotope with atomic mass 63 and 27.5% of the isotope with atomic mass 65 in copper.
What is the base name for the following compound?
C-C-C=0
Which of the following changes would double the force between two charged particles
Answer:
Decreasing the distance between the particles by a factor of 2
Explanation:
To double the force between the two charge particles, the distance between the particles should be reduced by a factor of two.
According to coulombs law "force is directly proportional to the potential between the two charges and inversely proportional to the square of their distances".
F = [tex]\frac{kq_{1} q_{2} }{r^{2} }[/tex]
F is the electric force
k is the coulomb constant
q is the charge
r is the distance or separation
As the separation between the charges is reduced the force increases and vice versa
Answer:
A
Explanation:
A. P. E. X.
HELP ME PLEASE AND GOOD MORNING
Answer:
I think it is lightning
Explanation:
Lightning creates an electricity and it has lots of energy, so I think that it is lightning
Answer:
Good morning as well! The answer to this question is lightning.
Explanation:
Lightning is a source of electrical energy. Lightning also has a certain amount of voltage. Frozen raindrops bump into each other in the air causing an electrical charge. Therefore, lightning is created.
A 90.00 g sample of Na, CO *xH, O is heated until all of the water is driven
off, forming 32.28 g of the anhydrous salt, Na, Coz. What is the percent by
mass of H,O in the hydrated compound, Na CO, *xH,O?*
The percent by mass of H₂O in the hydrated compound, Na₂CO₃.xH₂O = 64.13%
Further explanationGiven
90 g sample Na₂CO₃.xH₂O
32.28 g Na₂CO₃
Required
The percent by mass of H₂O
Solution
mass of H₂O = mass of sample - mass of the anhydrous salt, Na₂CO₃
[tex]\tt mass~H_2O=90-32.28=57.72~g[/tex]
The percent by mass :
[tex]\tt \%mass~H_2O=\dfrac{mass~H_2O}{mass~sample}\times 100\%\\\\\%mass~H_2O=\dfrac{57.72}{90}\times 100\%\\\\\%mass~H_2O=64.13\%[/tex]
Write the combustion product of butane in excess
oxygen.
Answer:
The name of the products are CO2 = carbon dioxide and H2O = water. The type of reaction is a combustion reaction.
Explanation:
Answer:
carbon di oxide and water
Commercial scuba divers use tanks filled with a mixture of gases known as Trimix on very long, deep dives. Trimix is composed of 70% nitrogen, 10% oxygen and 20% helium. The total pressure of the Trimix inside a certain tank at the beginning of the dive is 118.4 atm. A. What is the partial pressure of the oxygen in the tank?
Answer:
Partial pressure of O = 11.84 atm
Explanation:
To solve the excersise we think in the partial pressure law with mole fraction.
Mole fraction of gas = Partial pressure of gas / Total pressure
We have data of all the mole fractions:
0.70 N0.10 O0.20 HLet's find out the partial pressure of oxygen in the tank. We replace data in the formula:
0.10 = Partial pressure of gas / 118.4 atm
0.10 . 118.4 atm = Partial pressure of gas → 11.84 atm
If we determine all the partial pressures:
0.70 . 118.4 atm = 82.88 atm → Partial pressure N
0.20 . 118.4 atm = 23.68 atm → Partial pressure He
We can determine the partial pressure of the trimix.
Sum of partial pressures of each gas = Total pressure of the mix
11.84 atm + 82.88 atm + 23.68 atm = 118.4 atm
(A way to see, if our operations were ok)
The partial pressure of oxygen in the tank is required.
The partial pressure of the oxygen in the tank is 11.84 atm.
[tex]x_o[/tex] = The mole fraction of oxygen = 10%
[tex]p[/tex] = The total partial pressure in the tank = 118.4 atm
The mole fraction of a gas is equal to the ratio of partial pressure of the gas to the total partial pressure.
[tex]x_o=\dfrac{p_o}{p}\\\Rightarrow p_o=x_op\\\Rightarrow p_o=0.1\times 118.4\\\Rightarrow p_o=11.84\ \text{atm}[/tex]
The partial pressure of the oxygen in the tank is 11.84 atm.
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wo people push on the same door from opposite sides as shown.
A man pushes on a door from the left. A woman pushes on the door from the right.
They will only see the door move when
both people exert the same force so that the forces are unbalanced.
neither person exerts a force on the door so that the net force is zero.
one person exerts more force than the other so that the forces are unbalanced.
both people exert the same force so that the forces are balanced.
Answer is:
When one person exerts more force than the other so that the forces are unbalanced........ maybe, im not sure if im right
Answer:
c
Explanation:
During photosynthesis, plants take carbon dioxide from the air and water and convert them into:
A. amino acids
B. glucose and oxygen
C. oxygen and chlorophyll
D. water and sunlight
Answer:
c I am pretty sure it's c because I learned this today in science and I think that what it is but if it's not see then it's I don't know
help pls i give 20 points
The standard cell potential for : 3A(s) + B+3(aq) → 3A+(aq) + B(s) is E° = 2.00 V. How does Ecell compare to Eo when [A+] = 0.50, [B3+] = 1.5 x 10-3 at 298 K.
E cell = 1.962 V
Further explanationGiven
E° cell = 2.00 V
Required
E cell at 298 K
Solution
The potential cell for nonstandard conditions we can use the Nernst equation
[tex]\rm E = E ^ o -\dfrac {RT} {nF} lnQ[/tex]
For temperature T = 298 K,
[tex]\rm E = E ^ o -\dfrac {0.0592V} {n} log \: Q[/tex]
Reaction
3A(s) + B+3(aq) → 3A+(aq) + B(s)
Half Reaction
3A(s)⇒3A⁺(aq)+3e⁻
B⁺³(aq)+3e⁻⇒B(s)
n = 3 (3 electron transfer)
Q = the reaction quotient :
[tex]\tt Q=\dfrac{[A^+]^3}{[B^{+3}]}=\dfrac{0.5^3}{1.5.10^{-3}}=83.3[/tex]
E cell :
[tex]\tt E_{cell}=2-\dfrac{0.0592}{3}log~83.3\\\\E_{cell}=1.962~V[/tex]
Injuries from work related falls can affect employees by resulting in time off and medical cost
Answer:
true
Explanation:
its A
The above statement is considered to be correct and true.
The Occupational Safety and Health Administration (OSHA) is a federal agency that is saddled with the responsibility of assuring and ensuring a safe and healthy working conditions for an employee or group of employees by doing the following;
Setting and enforcing safety standards.Setting and enforcing rules.Providing education.Conducting trainings and assistance to various organizations.According to the Occupational Safety and Health Administration (OSHA), trainings on the adoption and application of safety precautions (tools) such as wearing a personal protective equipment (PPE); face masks (respirators), ear plugs, safety boots, gloves, helmet, etc., are very important and are essentially to be used by all employees (workers) while working in hazard prone environments or industries.
However, when an employee fails to strictly adhere to the recommended OSHA safety precautions, he or she is more likely to sustain a work-related accident or injury from a fall. Thus, this would negatively affect (impact) the employee because it results in him or her being absent from work (time off) and requires some costs to pay for medicals (medical cost).
In conclusion, injuries from work related falls can affect employees by resulting in time off and medical cost.
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A nuclear reaction in which the nuclei of atoms join together is called nuclear fission.
true or false
Answer:
That is true!
Explanation:
How many moles are in 34.2 g Ca
Answer:
0.855 moles are present in 34.2 g of Ca
If 56 grams of nitrogen is mixed with 56 grams of oxygen, what is the pressure of each gas if the total
pressure is 1320 Torrs?
Answer:
pN₂ = 695 torr; pO₂ = 625 torr
Explanation:
Step 1: Calculate the moles of each gas
The molar mass of N₂ is 28.01 g/mol.
56 g × 1 mol/28.01 g = 2.0 mol
The molar mass of O₂ is 32.00 g/mol.
56 g × 1 mol/32.00 g = 1.8 mol
Step 2: Calculate the total number of moles
n = nO₂ + nN₂ = 1.8 mol + 2.0 mol = 3.8 mol
Step 3: Calculate the partial pressure of each gas
We will use the following expressions.
pN₂ = P × X(N₂)
pN₂ = 1320 torr × (2.0 mol/3.8 mol)
pN₂ = 695 torr
pO₂ = P × X(O₂)
pO₂ = 1320 torr × (1.8 mol/3.8 mol)
pO₂ = 625 torr
1. Which type of blood cell is the most numerous in the body?
O a. red blood cells
O b. white blood cells
c. platelets
d. plasma
Answer:
red blood cells
Explanation:
I'm not so sure though
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will give brainliest
Answer:
Kinetic energy.
Explanation:
Air,steam and water under pressure are all examples of ___. A)vapors B) nonhazardous materials C)stored energy D) DC power sources
Answer:
a
Explanation:
Air, steam, and water are the different phases of matter, including gas and liquid. Air, steam, and water under pressure are all examples of vapors. Thus, option A is correct.
What are phases of matter?Matter is any substance present in the form of liquid, solid, or gas. They have the property to get converted into another phase of matter under specific pressure and temperature conditions.
The vapor and air are present as an invisible gas, and water is a visible liquid that can be converted into a vapor state under high pressure and temperature condition. The process of evaporation can convert water molecules into vapor. Air and steam are used as vapor under pressure in inhalation devices.
Therefore, option A. the air, steam, and water are vapor under pressure.
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Which type of energy is always generated, at least in small amounts, when an energy transfer or transformation accounts? A. Potential energy
B.thermal energy
C. Chemical energy
D. Radiant energy
Please answer on paper and send a picture of the answer. thank you
Answer:
I dont know how to take a picture so I will just tell you the answer. The answer is no.
Explanation:
Hope this helps. :) :D
CO2 + H2O → H2CO3. If 495 milliliters of carbon dioxide at 25°C and 101.3 kilopascals reacts with excess water, what is the theoretical yield of carbonic acid?
Answer:
The theoretical yield of carbonic acid is 1.24 grams.
Explanation:
The balanced equation for the formation of carbonic acid by the reaction of carbon dioxide with water is:
CO₂ + H₂O → H₂CO₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of reactant and product participate:
CO₂: 1 moleH₂O: 1 moleH₂CO₃: 1 moleAn ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
Moles of carbon dioxide can be calculated using ideal gas law equation. In this case:
P= 101.3 kPa= 1 atmV= 495 mL= 0.495 L (being 1,000 mL=1 L)n=?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= 25 C= 298 K (being 0 C=273 K)Replacing:
1 atm* 0.495 L= n* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *298 K
Solving:
[tex]n=\frac{1 atm*0.495 L}{0.082\frac{atm*L}{mol*K}*298 K }[/tex]
n= 0.02 moles
Then, by reaction stoichiometry 0.02 moles of carbon dioxide produces 0.02 moles of carbonic acid.
Since the molar mass of carbonic acid is 62.03 g/mol, then you can apply the following rule of three: if there are 62.03 grams in 1 mole, how much mass is there in 0.02 moles?
[tex]mass=\frac{0.02 moles*62.03 grams}{1 mole}[/tex]
mass= 1.24 grams
The theoretical yield of carbonic acid is 1.24 grams.
A student builds an electromagnet using a battery and coiling wire around a nail. The student observes that the electromagnet attracts pins.
Answer:
A
Explanation:
A
Which of the following would be found ONLY in plant cells
Answer:
chloroplasts, cell walls, or intracellular vacuoles
Explanation:
You didn't list the following, but I'm guessing it is chloroplasts, cell walls, or intracellular vacuoles
What is the BEST reason that the older children did not show the symptoms of pellagra?
I need help!!
what are three ways the plates can move
Dust storms in the Sahara desert carry mineral nutrients across the Atlantic Ocean to replenish the supply leached out of the soils of the Amazon basin. What was an important mineral fertilizer delivered this way, mentioned in the video?
Answer:
Phosphorus.
Explanation:
Phosphorus is the important fertilizer which comes through the dust storms of Sahara desert and provides this nutrient to the soils of the Amazon basin. Phosphorus is an important macronutrient that is necessary for the growth and development of plants so we can conclude that this dust storms are very important for the fertility of the soils present in Amazon basin.
Can gravity be considered a force?
Answer: Gravity is considered a universal force because it acts between any two masses anywhere in the universe.
Answer:
Gravity (from Latin gravitas 'weight'[1]), or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light[2]—are brought toward (or gravitate toward) one another. On Earth, gravity gives weight to physical objects, and the Moon's gravity causes the ocean tides.
What is a common form for synthesis reactions?
a. AB → C
b. A + B → BC
c. C → A + B
d. A + B → C
Answer:
The Best Answer would be B but the correct answer is A+B --> AB
Explanation:
help is science, if you don't know the answer just don't put anything /:
Answer:
Light
Explanation:
Light is a good example of invisible particles. We cannot see light particles aka photon. We only know the light is present by the objects we see. Because we can only see objects when light reflects from them on our eyes.
[I could only think of one example if I can remember one more I'll edit it down]
Approximately how many joules of heat are required to raise the temperature of 20 grams of water from 30°C to 40°C?
A
134 J
B
168 )
C.
420 j
D.
840 J
The heat required : 840 J
Further explanationGiven
mass of water = 20 g
Temperature : 30°C to 40°C
Required
Heat to raise the temperature
Solution
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C (for water= 4.18 J/g° C)
∆T = temperature difference, ° C / K
The heat :
[tex]\tt Q=20\times 4.2\times (40-30)\\\\Q=\boxed{\bold{840~J}}[/tex]