Answer:
They would use 15.17 g KNO₃.
Explanation:
To solve this problem first we calculate the number of KNO₃ moles that would be in the solution, multiplying the concentration times the volume:
moles = Concentration * Volume750 mL ⇒ 750 / 1000 = 0.750 L
0.200 M * 0.750 L = 0.150 mol KNO₃Then we convert moles of KNO₃ to grams, using its molar mass:
0.150 mol KNO₃ * 101.11 g/mol = 15.17 g KNO₃
What kind of chemical bond forms when electrons are given away or taken on?
Answer:
ionic bonding
Explanation:
In ionic bonding, electrons are completely transferred from one atom to another. In the process of either losing or gaining negatively charged electrons, the reacting atoms form ions. The oppositely charged ions are attracted to each other by electrostatic forces, which are the basis of the ionic bond.
Answer:
Covalent Bonds
Explanation:
Explain how the carbon cycle affects climate change(in your own words as detailed as possible)
Answer:
Carbon is the chemical backbone of life on Earth. Carbon compounds regulate the Earth’s temperature, make up the food that sustains us, and provide energy that fuels our global economy. Most of Earth’s carbon is stored in rocks and sediments. The rest is located in the ocean, atmosphere, and in living organisms. These are the reservoirs through which carbon cycles.The ocean plays a critical role in carbon storage, as it holds about 50 times more carbon than the atmosphere. Two-way carbon exchange can occur quickly between the ocean’s surface waters and the atmosphere, but carbon may be stored for centuries at the deepest ocean depths.
Explanation:
A 1.0 x 102- gram sample is found to be pure alanine, an amino acid found in proteins. How many moles of alanine are in the sample
Answer:
1.123x10⁻⁴ moles of alanine
Explanation:
In order to convert grams of alanine into moles, we need to know its molecular weight:
The formula for alanine is C₃H₇NO₂, meaning its molecular weight would be:
12*3 + 7*1 + 14 + 16*2 = 89 g/molThen we divide the sample mass by the molecular weight, to do the conversion:
1.0x10⁻² g ÷ 89 g/mol = 1.123x10⁻⁴ molesHow many atoms are in 2.0 moles of C2H6
Answer:
2 atoms of carbon combine with 6 atoms of hydrogen to from ethane.
What is the total number of atoms of oxygen in the formula Al(CIO3)3 + 6H20?
1. 6
2. 9
3. 10
4. 15
A mixture of helium, nitrogen, and oxygen has a total pressure of 756 mmHg. The partial pressures of helium and nitrogen are 229 mmHg and 205 mmHg, respectively. What is the partial pressure of oxygen in the mixture?
Answer:
322 mmHg
Explanation:
Step 1: Given data
Total pressure of the gaseous mixture (P): 756 mmHgPartial pressure of helium (pHe): 229 mmHgPartial pressure of nitrogen (pN₂): 205 mmHgStep 2: Calculate the partial pressure of oxygen (pO₂)
The total pressure of the gaseous mixture is equal to the sum of the partial pressures of the individual gases.
P = pHe + pN₂ + pO₂
pO₂ = P - pHe - pN₂
pO₂ = 756 mmHg - 229 mmHg - 205 mmHg
pO₂ = 322 mmHg
if 2.0 mol of Zn is mixed with 3.0 mol
of HCl, which reactant will be limiting?
The following Balanced Reaction will take place:
Zn + 2HCl → ZnCl₂ + H₂
In the question, we have 2 moles of Zinc and 3 moles of HCl for this reaction
Amount of HCl required to completely react with 2 moles of Zn:
Since we need 2 moles of HCl for every mole of Zn, we will need 2(2) = 4 moles of HCl for every 2 moles of Zn
Identifying the Limiting Reagent:
But we are only given 3 moles of HCl where we need 4 moles to completely react.
So, since HCl is in less amount, it is the Limiting Reagent
g A radioactive isotope of mercury, 197Hg, decays to gold, 197Au, with a disintegration constant of 0.0108hrs.-1. What % of the sample of mercury will remain after 10 days
Answer:
7.49% of Mercury
Explanation:
Let N₀ represent the original amount.
Let N represent the amount after 10 days.
From the question given above, the following data were obtained:
Rate of disintegration (K) = 0.0108 h¯¹
Time (t) = 10 days
Percentage of Mercury remaining =?
Next, we shall convert 10 days to hours. This can be obtained as follow:
1 day = 24 h
Therefore,
10 days = 10 day × 24 h / 1 day
10 days = 240 h
Thus, 10 days is equivalent to 240 h.
Finally, we shall determine the percentage of Mercury remaining as follow:
Rate of disintegration (K) = 0.0108 h¯¹
Time (t) = 10 days
Percentage of Mercury remaining =?
Log (N₀/N) = kt /2.303
Log (N₀/N) = 0.0108 × 240 /2.303
Log (N₀/N) = 2.592 / 2.303
Log (N₀/N) = 1.1255
Take the anti log of 1.1255
N₀/N = anti log 1.1255
N₀/N = 13.3506
Invert the above expression
N/N₀ = 1/13.3506
N/N₀ = 0.0749
Multiply by 100 to express in percent.
N/N₀ = 0.0749 × 100
N/N₀ = 7.49%
Thus, 7.49% of Mercury will be remaining after 10 days
2 Draw circles around the examples below that are non-metals.
chlorine
silver
helium
carbon
iron
mercury
calcium
neon
sodium
sulfur
gold
zinc
Answer:
Chlorine
Carbon
Sulphur
Rest all are metals.
More to know -
Silver metal is use in jewellery
helium is present is atmosphere ( it is harmful for living being )
Carbon is use in wires
Iron is uses in many articles like ships , Iron nail
Calcium is use to purify water
gWhat is the concentration of a solution made by diluting 5.0 mL of a 3.2 M glucose solution by adding enough water to make a 40.0 mL solution
Answer:
0.4 M
Explanation:
To solve this problem first we calculate the number of glucose moles, using the first volume and concentration:
3.2 M * 5.0 mL = 16 mmol glucoseThis number of moles remains the same throughout the dilution process. So we can now calculate the concentration of the second solution, dividing the number of moles by the second volume:
16 mmol / 40.0 mL = 0.4 M. An excited hydrogen atom with an electron in the n 5 5 state emits light having a frequency of 6.90 3 1014 s21. Determine the principal quantum level for the final state in this electronic transition.
Answer:
2
Explanation:
Given that the energy of a photon of light is obtained from;
ΔE = hf = 6.6 * 10^-34 Js * 6.903 * 10^14 = 45.6 * 10^-20 J
For moving from n=2 -n-=5 the electron absorbed energy hence the energy is positive.
but;
ΔE = -2.18 * 10^-18 (1/n^2final - 1/n^2initial)
45.6 * 10^-20 J= 2.18 * 10^-18 J (1/n^2final - 1/5^2)
0.21 = (1/n^2final - 1/5^2)
1/n^2final = 0.21 + 1/5^2
n^2final = 4
nfinal = 2
The principal quantum level for the final state in this electronic transition is 2.
We first find the wavelength of the hydrogen atom Using the formula;
λ = c/f
λ= wavelength of the photon
h = Plank's constant
f = frequency
λ =3 × 10^8 m/s / 6.903 x 10^14 s-1
λ = 4.3459 × 10^-7 m
Now that we know that
Initial transition = 2Wavelength =4.3459 × 10^-7 mWe can now use the Rydberg equation 1/λ =R(1/n²f -1/n²i)to determine the principal quantum level in which the electron stopped.
Remember that Rydberg constant = 1.09 x 10^7 m⁻1
1/λ =R(1/n²f -1/n²i)
1/4.3459 × 10^-7 m = 1.09 x 10^7 m⁻1(1/n²f -1/5²)
1/(4.3459 × 10^-7 m x1.09 x 10^7) = (1/n²f -1/5²)
1/4.7370= (1/n²f -1/5²)
0.211= (1/n²f -1/5²)
1/n²f= 0.211+ (1/5²)
1/n²f= 0.211+0.04
1/n²f=0.25
n²f=1/0.25
nf = √4
nf = 2
Therefore final transistion is 2.0
Learn more on Calclations involving principal quantum level here:https://brainly.com/question/14651828
When initially set up, in which direction does the thermal energy between the flasks flow?
A
Thermal energy flows from the flask on the left to the flask on the right.
B
Thermal energy flows from the flask on the right to the flask on the left.
C
Thermal energy does not flow between the two flasks.
D
Thermal energy flows equally between the two flasks.
Answer:
How you going to delete my answer even though it was right but dont delete his answer bro didnt even say nun
Explanation:
Answer D
Thermal energy flows from the flask on the left to the flask on the right as energy is transferred from higher to lower temperature.
What is thermal energy?
Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.
Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.
These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.
Learn more about thermal energy,here:
https://brainly.com/question/3022807
#SPJ2
What is a potential benefit of fuel cell cars?
O increased efficiency converting gasoline to energy
O no recharging necessary
O decreased automobile cost
O larger engines
Answer:
no recharging necessary
Answer:
What is a potential benefit of fuel cell cars?
increased efficiency converting gasoline to energy
✔ no recharging necessary or B.)
decreased automobile cost
larger engines
When formic acid is treated with potassium hydroxide (KOH), an acid-base reaction occurs, forming a carboxylate ion. For the mechanism, draw the curved arrows as needed. Include lone pairs and charges in your answer. Do not draw out any hydrogen explicitly in your products.
Answer:
See explanation
Explanation:
The reaction between formic acid and potassium hydroxide is an acid base reaction.
Remember that an acid base reaction yields salt and water only.
If you look at the curved arrow mechanism shown, you will discover that the hydroxide ion from KOH abstracts a proton from the acid to yield potassium formate and water
question: Looking at the above visual of "Atmospheres of the Solar System" What are two patterns
you can find? PLEASE HELP DUE TONIGHT!
Answer:
The first and most obvious pattern I see is that all gas giants have an atmosphere mainly made up of hydrogen
The second thing I notice is that all the rocky planets have a significant amount of Nitrogen in their atmospheres except Mercury.
The third thing I notice is that all planets have one element that makes up 75% or more of its atmosphere except Mercury.
(If this is good, may I have brainliest, please? I'm kinda poor..)
Answer:
It's hard to find patterns in the solar system's atmosphere but I think above found a lot of them.
I need help with this pls
Answer:
[tex]1)20 \\ 2)13 \\ 3)82 \\ 4)56 \\ 5)26 \\ 6)1 \\ hope \: it \: helps \\ plzzz \: mark \: it \: as \: brainliest...[/tex]
What is the complete balanced equation for the reaction
between magnesium hydroxide and hydrogen chloride to
produce magnesium chloride and water is
O MgOH + HCI → MgCl + H2O.
O Mg(OH)2 + 2HCl → MgCl2 + 2H20.
O Mg(OH)2 + HCl → Mg + 2CO2 +3H20.
O Mg(OH)2 + 2HCl → MgCl2 + H2 + O2.
Answer:
[tex]mg(oh) {}^{2} + 2hcl) \\ gives \\ \: mgcl2 + 2h {}^{2}o[/tex]
[tex]option. b \: is \: the \: correct \\ \: balanced \: equation[/tex]
Calculate the density of a material that has a mass of 60g and a volume of 15 ml.
Need help ASAP
Answer:
4 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{60}{15} \\ [/tex]
We have the final answer as
4 g/mLHope this helps you
The picture shows to containers filled with a gas, both initially at room temperature
AAA
Ice
Heat
Which statement is correct? (5 points)
The gas particles in both containers have the same average kinetic energy because they have equal number of particles
The gas particles in both containers have the same average kinetic energy because they have the same volume
The average kinetic energy of the gas particles is greater in container A because it has a lower temperature
The average kinetic energy of the gas particles is greater in container 8 because its particles move faster
Od
Answer:
D. The average kinetic energy of the gas particles is greater in container B because its particles move faster.
Explanation:
Option D is the correct statement. From the excerpt, it can be seen that container B is being heated. The heat that is applied to container B will make the temperature of the gas to increase, thereby increasing the average kinetic energy. This will cause the gas molecules to mover faster and with force hitting the walls of the gas container. At this time, pressure should increase. Also, the volume of the gas increases just as the temperature of the gas also increases.
Answer:
D. The average kinetic energy of the gas particles is greater in container B because its particles move faster.
Explanation:
which climate is most likely found in a high pressure belt giving brainliest ty
Answer:
Rain forest.
Explanation: Because of how humid it is in a rain forest that humidity will bring a lot of pressure from above.
Answer:
A is the answer. Here is proof. Plz mark brainliest.
Explanation:
Arrange the following elements in order of decreasing ionization energy: Cl, Si, P, Ar *
Answer:
Ar > Cl > P > Si.
NEED HELP!! WILL NAME THE BRAINIEST!!!
are the counterfeit coins examples of mixtures, compounds, or elements?
Answer:
elementas
Explanation:
When the pressure of a gas doubles, the new volume
Answer:
yes it does
Explanation:
The end point in a titration of a 43ml sample of aqueous lactic acid was reached by addition of 16mlof0.22MKOH titrant. One mole of acid was titrated by one mole of base. What is the molar concentration of lactic acid
Answer:
0.082 M
Explanation:
First we calculate the moles of KOH added, by multiplying its volume and concentration:
0.22 M * 16 mL = 3.52 mmol KOHGiven that one mole of acid reacts with one mole of base, in the lactic acid sample there were 3.52 acid moles as well.
Finally we divide the acid moles by the volume, to calculate the concentration:
3.52 acid moles / 43 mL = 0.082 MIf volatiles such as water vapor and carbon dioxide are added to a rock, what will happen to the melting temperature
Answer:
The melting temperature of a rock will decrease
Explanation:
In the case when the water vapour and the carbon dioxide is added to the rock so the rock melting temperature would be reduced as if we added the salt to an ice on a road so it reduced the temperature
Therefore according to the given situation, the last option is correct
And, the rest of the options are wrong
The partial pressure of carbon dioxide in the atmosphere is 0.0318 kpa . Calculate the partial pressure in .Round answer to significant digits
Answer:
Partial pressure of carbon dioxide in the atmosphere = 0.0003184 atm (Approx)
Explanation:
Given:
Partial pressure of carbon dioxide in the atmosphere = 0.0318 kPa
Computation:
1 Kilo-pascal (kPa) = 0.00986923 atm
Partial pressure of carbon dioxide in the atmosphere = 0.0318 kPa
Partial pressure of carbon dioxide in the atmosphere = 0.0318 kPa x 0.00986923 atm
Partial pressure of carbon dioxide in the atmosphere = 0.0003184 atm (Approx)
A compound is 26.06 % N and73.94 % O. If the compound's molar mass is 108.0 g/mol, what is its molecular formula.
Answer:
yes
Explanation:
no jk, whats the mass?
How does shielding impact the strength of attraction between the nucleus and the valence electrons?
Answer:
The shielding effect explains why valence shell electrons are more easily removed from the atom. The nucleus can pull the valence shell in tighter when the attraction is strong and less tight when the attraction is weakened. The more shielding that occurs, the further the valence shell can spread out.
Explanation:
Help me I got stuck
Pls
name and describe three measures of central tendency used to summarize data
Answer: Mean, main, and mode
