Answer:
dissociation, in chemistry, separation of a substance into atoms or ions. ... For example, hydrogen molecules (H2) dissociate into atoms (H) at very high temperatures; at 5,000°K about 95% of the molecules in a sample of hydrogen are dissociated into atoms.
Explanation:
Which statement correctly describes the actual yield and the theoretical yield of a reaction? (1 point)
The actual yield is calculated from the reactant amounts, but the theoretical yield must be measured for each instance of a reaction
The actual yield is calculated from the amount of the limiting reactant, and the theoretical yield is calculated from the amount of the excess
The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts.
The actual yield represents the maximum yield possible, and the theoretical yield assumes perfect reaction conditions.
Answer:
C: The actual yield depends on the reaction conditions, but the theoretical yield varies only with reactant amounts
Explanation:
Looking at the options, the correct one is Option C because the actual yield usually depends on the conditions of the reaction, while the theoretical yield usually varies with only the amount of reactant.
true or false
1. resistance provides friction to electron movement
2.high resistance will speed up electron movement
3.a circuit is an open path for electrons to move through
4. in a circuit, electrons move from the low voltage area to the higher
5. in a circuit, the light bulb is called the load
Answer:1
Explanation: friction is showing us how in the past
2. Which number is not a coefficient in the equation,
2C6H14+ 19O2,-- 12CO2,+ 14H2O?
Answer:
2, 19, 12 and 14 are the coefficients.
Chlorine, iodine, and bromine are located near each other on the periodic table. Which of these elements is the atom with the highest first ionization energy?
Answer:
Chlorine has the highest amongst all of those
If you have 9.3×1026 molecules of iron that rusts, how many molecules of oxygen does it take?
__Fe + __O2 à __Fe2O3
Answer:1.395x10^27 molecules of O2
Explanation:
2Fe + 3/2O2 —> Fe2O3
for every 2 atoms of Fe, 1.5 molecules of O2 —> 1.395x10^27
HELP QUICK ILL MARK U AS BRAINLIEST
vWHAT ARE THE 4 MAIN EVIDENCES of EVOLUTION?
Answer:
The Sugar Act (1764),
The Currency Act (1764),
The Quartering Act (1765),
The Stamp Act (1765)
Explanation:
All of these Led to the american Revolution.
Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar system based only on what they could see with their eyes. Describe Ptolemy's model of the solar system and how he came to his conclusions. Then describe Galileo's model of the solar system. Explain how Galileo proved that his model was correct and that Ptolemy’s was not correct.
Explanation:
Galileo found Venus went through the entire phase cycle, proving that she revolved completely around the Sun, as predicted by Copernicus in his heliocentric model. ... The phases of Venus could not be explained by Ptolemy's Geocentric Model. Galileo knew that the Roman Catholic Church was incorrect.
How is reproduction and life are connected?
Answer:
reproduction and life are connected because when you reproduce you are creating life.
If 200,4 g of water is mixed with 101.42 g of salt, the mass of the final solution
would be reported as
A) 302 8.
B) 3008
C) 301.8 8.
D) 301.828
Answer:
C) 301.8
Explanation:
Hello!
In this case, since the solution is composed by water and salt, the total resulting mass comes up from adding the mixed mass of each one:
[tex]m_{sol}=m_{w}+m_{salt}[/tex]
Thus, we plug in to obtain:
[tex]m_{sol}=200.4g+101.42g\\\\m_{sol}=301.8g[/tex]
Therefore, the answer should be C) 301.8 as it has four significant figures.
Best regards!
Is my answer correct
Answer:
You're answer is correct. The third answer is correct.
Explanation:
Producers have the most energy, since they gain energy directly from the sun. Their energy is then passed up this upside down pyramid, which the energy is decreased by about 10% each time.
#teamtrees #WAP (Water And Plant)
help put them in order
Answer:
hello
Explanation:
hi
Chemistry
Definition in your own words
Will check if you got it from online.
Word: Phase change
At what temperature does ice start to melt
Answer:
Explanation:
The answer is 32°F or 0° Celsius.
Hope it helped you.
What kind of reaction is potassium+ nitrogen
Answer:
Potassium nitrate is a chemical compound with the chemical formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−, and is therefore an alkali metal nitrate. It occurs in nature as a mineral, niter (or nitre in the UK). It is a source of nitrogen, and nitrogen was named after niter.
Explanation:
45 points! How much heat in Joules would it take to heat up a block of aluminum that weighs 1000.0 grams from a temperature of 70 degrees C, to it's melting point at 192.4C? specific heat for aluminum is .89 J/g-C. do not round answer- pls help
Answer:
1.1 × 10⁵ J
Explanation:
Step 1: Given data
Mass of the aluminum block (m): 1000.0 gInitial temperature: 70 °CFinal temperature: 192.4 °CSpecific heat for aluminum (c): 0.89 J/g.°CStep 2: Calculate the change in the temperature
ΔT = 192.4 °C - 70 °C = 122 °C
Step 3: Calculate the heat required (Q)
We will use the following expression.
Q = c × m × ΔT
Q = 0.89 J/g.°C × 1000.0 g × 122 °C
Q = 1.1 × 10⁵ J
I will mark brainliest I just need help plzzz
Answer:
Look at the picture below
Explanation:
which type on bond is present in copper wire?
A. Covalent
B. Ionic
C Electrovalent
D. Metallic
Answer:
metallic bonding
Explanation:
Copper wire consists of Cu nuclei (that are positively charged due to the positively charged protons) that are surrounded by a "sea" of delocalized electrons (that are negatively charged that move freely throughout the material which is known as metallic bonding.
Answer:
Metallic bonding.
Explanation:
Pure copper is neither covalent nor ironic. It is a bonding called metallic bonding.
What happens to the energy released by an exothermic reactions
Answer:
In an exothermic reaction, the products are at a lower energy than the reactants. The difference between the energy of the reactants and the energy of the products is called the enthalpy change (∆H) of the reaction. For an exothermic reaction, the enthalpy change is always negative.
A shoe was thrown across the room and it hit a desk directly across, the shoe flew 5m within 6 seconds, what is my velocity?
Answer:
[tex]velocity = \frac{displacement}{time} \\ = \frac{5}{6} \\ velocity = \frac{5}{6} m {s}^{ - 1} [/tex]
Which of these is NOT a factor considered is
describing the climate of a region?
Answer:
the population of the region
Hope this helps :)
will give brainliest!! please help ! .. Calculate the total pressure of the mixture in atmospheres ( atm ).
Answer:
13.94 atm
Explanation:
From the question given above, the following data were obtained:
Pressure of H₂ = 2 atm
Pressure of NH₃ = 303 KPa
Pressure of CO₂ = 3000 mmHg
Pressure of N₂ = 3800 torr
Total pressure (Pₜ) in atm =?
Next, we shall convert 303 KPa, 3000 mmHg and 3800 torr to atm.
This can be obtained as follow:
Converting 303 KPa to atm
101.325 KPa = 1 atm
Therefore,
303 KPa = 303 KPa × 1 atm / 101.325 KPa
303 KPa = 2.99 atm
Thus, 303 KPa is equivalent to 2.99 atm.
Converting 3000 mmHg to atm
760 mmHg = 1 atm
Therefore,
3000 mmHg = 3000 mmHg × 1 atm / 760 mmHg
3000 mmHg = 3.95 atm
Thus, 3000 mmHg is equivalent to 3.95 atm
Converting 3800 torr to atm
760 torr = 1 atm
Therefore,
3800 torr = 3800 torr × 1 atm / 760 torr
3800 torr = 5 atm
Thus, 3800 torr is equivalent to 5 atm.
Finally, we shall determine the total pressure of the mixture as follow:
Pressure of H₂ (P₁) = 2 atm
Pressure of NH₃ (P₂) = 2.99 atm
Pressure of CO₂ (P₃) = 3.95 atm
Pressure of N₂ (P₄) = 5 atm
Total pressure (Pₜ) in atm =?
Pₜ = P₁ + P₂ + P₃ + P₄
Pₜ = 2 + 2.99 + 3.95 + 5
Pₜ = 13.94 atm
Therefore, the total pressure of the mixture is 13.94 atm
Explain why photosynthesis is much slower in underwater plants.
Answer
There is not as much sunlight underwater and therefore less energy can be absorbed therefore a slower process of photosynthesis.
Explanation:
The the balanced equations to: solutions of lithium sulfate and potassium phosphate are mixed together to make lithium phosphate and potassium sulfate
Answer:
[tex]3Li_2SO_4+2K_3PO_4\rightarrow 2Li_3PO_4+3K_2SO_4[/tex]
Explanation:
Hello!
In this case, when lithium sulfate and potassium phosphate solutions are mixed to yield lithium phosphate and potassium sulfate, the following chemical equation comes up:
[tex]Li_2SO_4+K_3PO_4\rightarrow Li_3PO_4+K_2SO_4[/tex]
However, as atoms are not balanced we apply the inspection method to obtain:
[tex]3Li_2SO_4+2K_3PO_4\rightarrow 2Li_3PO_4+3K_2SO_4[/tex]
Best regards!
The value of Henry's law constant for oxygen in water at 242C is 1.66 x 1 ox M/torr. b. c. Calculate the solubility of oxygen in water at 25aC when the total external pressure is I atm and the mole fraction of oxygen in the air IS 020. Calculate the solubility at the same temperature with the same atmospheric composition but at an increased pressure of 2 atn. What would happen to the solubility of the oxygen gas if the temperature was increased?
Rhenium has two naturally occurring isotopes, Re-185 and Re-187. The relative atomic mass of rhenium is 186.2. What are the natural abundances of these isotopes
Answer:
The natural abundance of Re-185 is 40% and of Re-187 is 60%
Explanation:
Relative atomic mass is defined as the sum of the mass of each isotope times its relative abundances.
Is Rhenium has only 2 isotopes and the abundances are X and Y we can write:
X + Y = 1 (1)
And:
185X + 187Y = 186.2 (2)
Where X is abundance of Re-185 and Y abundance of Re-187
Replacing (1) in (2):
185X + 187(1-X) = 186.2
185X + 187-187X = 186.2
-2X = -0.8
X = 0.4 = 40%
And Y = 100% - 40% = 60%
The natural abundance of Re-185 is 40% and of Re-187 is 60%How many moles are in 99.5 grams of titanium? Round your answer to the nearest hundredth. Be sure to include units.
Answer:
1000
Explanation:
A student pours some water into a plastic bag, seals the bag, and
places it in the freezer. Which aspect of the water molecules is the
same before and after freezing takes place?
5 of 11 QUESTIONS
Their speed
O Their number
O Their arrangement
O Their ability to move
Answer:
Their number
Explanation:
Freezing is the process of decreasing the activity of the molecules in the medium and their arrangement will change to take on the new shape but no new molecules are added or taken away
1. A student combined silver nitrate and sodium
chloride. She observed a white solid precipitate
formed. The mass of the silver chloride precipitate
was measured to be 150.15 g. According to the Law
of Conservation of mass, what is the predicted mass
of the sodium nitrate produce
AgNO
AgCl white
precipitate in
solution
Naci
NaNO
solution
solution
300.23 g
300.23 90
+ NaCl
AgNO3
AgC1
+
NaNO3
silver nitrate
and sodium chloride
yield silver
chloride
and
sodium nitrate
Answer:
150.08 g
Explanation:
According the law of conservation of mass, mass can neither be created nor destroyed but is converted from one form to another.
As a result of this, the total mass of reactants must be equal to the total mass of products.
If this is so, we have been told that the mass of AgCl is 150.15 g, the total mass of products is 300.23g.
Therefore; mass of NaNO3 = 300.23 g - 150.15 g = 150.08 g
White vinegar is a 5.0% by mass solution of acetic acid in water. If the density of white
vinegar is 1.007 g/cm3
, what is the pH?
The pH = 2.41
Further explanationGiven
5.0% by mass solution of acetic acid
the density of white vinegar is 1.007 g/cm3
Required
pH
Solution
Molarity of solution :
[tex]\tt M=\dfrac{\%mass\times \rho\times 10}{MW~acetic~acid}\\\\M=\dfrac{5\times 1.007\times 10}{60}\\\\M=0.839[/tex]
Ka for acetic acid = 1.8 x 10⁻⁵
[H⁺] for weak acid :
[tex]\tt [H^+]=\sqrt{Ka.M}[/tex]
Input the value :
[tex]\tt [H^+]=\sqrt{1.8\times 10^{-5}\times 0.839}\\\\(H^+]=0.00388=3.88\times 10^{-3}\\\\pH=3-log~3.88=2.41[/tex]
White vinegar is a 5.0% by mass solution of acetic acid in water and if the density of white vinegar is 1.007 g/cm³ then the pH of solution is 4.8.
How we calculate pH?pH of any solution will be calculated as:
pH = - log[H⁺], where
[H⁺] = concentration of H⁺ ions
In this question we will calculate the concentration of H⁺ ions as:
[H⁺] = √Ka.M, where
Ka = acid dissociation constant for acetic acid = 1.8 x 10⁻⁵ (known)
M is molarity and this can be calculated as:
M = (% mass × density × 10) / Molar mass of acid
Given that,
% mass = 5.0% by mass solution of acetic acid
density = 1.007 g/cm³
Molar mass of acetic acid = 60
Now putting all these values on the above equation, we get
M = (5 × 1.007 × 10) / 60 = 0.839
Now, we calculate the concentration of H⁺ ions by putting values on that equation as:
[H⁺] = √(1.8 x 10⁻⁵)(0.839)
[H⁺] = 1.5 x 10⁻⁵
So, pH of the solution will be calculated as:
pH = -log(1.5 x 10⁻⁵)
pH = -(-4.8)
pH = 4.8
Hence, pH is 4.8.
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https://brainly.com/question/10313314
Fill in the blanks with the correct words to complete the sentence.
Answer:
Explanation:
Salt water intrusion can cause the fresh water in wells to become contaminated with saltwater.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, salt water intrusion can cause the fresh water in wells to become contaminated with salt water.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. Salt water intrusion can cause the fresh water in wells to become contaminated with salt water.
Therefore, salt water intrusion can cause the fresh water in wells to become contaminated with salt water.
To learn more about chemical compound, here:
brainly.com/question/26487468
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