Answers
Answer:
it would be an element because its an element
Explanation:
Related Questions
Justine’s hair dryer has a resistance of 20 Ohms when first turned on. How much current does the hair dryer draw from the 110.-V line in Justine’s house? (Answer in amps)
Answers
Answer:
5.5 amps
Explanation:
V = I*R
110 = 20I
I = 5.5
draw the structure of the product of this reaction. use the wedge/hash bond tools to indicate stereochemistry where it exists. if there are alternative structures, draw the most stable one. if no reaction occurs, draw the organic starting material.
Answers
The E2 elimination reaction of cyclo-alkylhalides are usually stereo selective. Usually trans isomer reacts slowly than cis-isomer. So the elimination reaction in an alkaline potassium hydroxide medium will be 1-methyl cyclohexene.
The reason behind stereo selectivity is because pf the spatial orientation of the substituents on the ring structure. For cyclic compounds this has a great influence to direct a reaction in Regio-selectivity. The transition state between the reactant and product influence in the rate of elimination reaction.
Here the major elimination product is 1-methyl cyclohexene and a minor amount of 3-methyl cyclohexene is also produced.
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(The question is not complete. The complete question is given as an image)
The rate constant for the first-order decomposition at 45 degree C of dinitrogen pentoxide, N2O5, dissolved in chloroform, CHCI3, is 6.2*10^-4 min^-1. What is the rate of the reaction when [N2O5]=0.40 M? 2N2O5 -> 4NO2 + O2?
Answers
Answer:
The rate law for a first-order reaction is:
rate = k[N2O5]
where k is the rate constant and [N2O5] is the concentration of N2O5.
Plugging in the values given:
rate = (6.2*10^-4 min^-1) * (0.40 M) = 2.48*10^-4 M/min
Therefore, the rate of the reaction when [N2O5]=0.40 M is 2.48*10^-4 M/min.
If a 100. -g sample of a hydrated compound contains 37.07-g sodium, 48.39-g carbonate and 14.54-g water, find the empirical formula
Answers
he required empirical formula based on the data provided is Na2CO3.H2O.
What is empirical formula?The term empirical formula refers to the formula of a compound which shows the ratio of each specie present.
We have the following;
Mass of sodium = 37.07-g
Mass of carbonate = 48.39 g
Mass of water = 14.54-g
Number of moles of sodium = 37.07-g/23 g/mol = 2 moles
Number of moles of carbonate = 48.39 g/61 g/mol = 1 mole
Number of moles of water = 14.54/18 g/mol = 1 mole
The mole ratio is 2 : 1: 1
Hence, the required empirical formula is Na2CO3.H2O
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how many grams of hydrogen gas will be produced if you start with 15.0 grams of zinc and an excess amount of HCl?
Answers
Answer:
1.8
Explanation:
Nickel forms a large number of ammonia salts with the general formula of Ni*(NH₂) Br pH₂O where m. n.and p represent the coefficients in the formula. An analysis of the salt can be obtained if a sample is dissolvedby an acid-base reaction in excess acid and then the excess is titrated with NaOH. - That is, [Ni (NH3)m pH3,O] +mHCl=mCl +pH₂O +(Ni^2+) +mNH4^+,excess HCl + OH = H₂O
Answers
The nickel salt, Ni(NH3)m(pH3)o, is a complex compound that can be analyzed through an acid-base reaction.
How to analyze the salt?The salt is dissolved in excess acid (HCl) to form the nickel ion (Ni^2+) and ammonia (NH4^+) along with water (H2O) and the chloride ion (Cl-). This reaction can be represented by the equation: [Ni(NH3)m(pH3)o] + mHCl = mCl- + pH2O + (Ni^2+) + mNH4^+. The excess acid is then titrated with a strong base, such as sodium hydroxide (NaOH), to determine the amount of acid present in the original sample. This can be represented by the equation: Excess HCl + OH- = H2O. This process is known as a back-titration, which allows for the determination of the number of moles of acid present in the original sample of the nickel salt. The coefficients m, n and p in the formula for the nickel salt can be determined by the stoichiometry of the acid-base reaction.To learn more about salt refer :
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Use the band of stability to determine if europium-154 is a stable or unstable nucleus. Hint: You
must first find the atomic number to determine the number of protons and then use the equation,
neutrons = mass number - protons, to find the neutrons.
On/Z=0.69, unstable
On/Z=0.69, stable
On/Z=1.44, unstable
On/Z=1.44, stable
Answers
Answer:
1.44 STABLE
Explanation:
In using the Haber process in the formation of ammonia, what mass of hydrogen is needed to produce 51.0 grams of ammonia? 3 H₂(g) + N2 (g) → 2 NH3(g).
Answers
The mass of hydrogen needed to produce 51.0 grams of ammonia is ≈ 9.07 grams.
To determine the mass of hydrogen required to produce 51.0 grams of ammonia (NH3) using the Haber process, we need to calculate the stoichiometric ratio between hydrogen and ammonia.
From the balanced chemical equation:
3 H₂(g) + N₂(g) → 2 NH₃(g)
We can see that for every 3 moles of hydrogen (H₂), we obtain 2 moles of ammonia (NH₃).
First, we need to convert the given mass of ammonia (51.0 grams) to moles. The molar mass of NH₃ is 17.03 g/mol.
Number of moles of NH₃ = Mass / Molar mass
= 51.0 g / 17.03 g/mol
≈ 2.995 moles
Next, using the stoichiometric ratio, we can calculate the moles of hydrogen required.
Moles of H₂ = (Moles of NH₃ × Coefficient of H₂) / Coefficient of NH₃
= (2.995 moles × 3) / 2
≈ 4.493 moles
Finally, we can convert the moles of hydrogen to mass using the molar mass of hydrogen (2.02 g/mol).
Mass of H₂ = Moles × Molar mass
= 4.493 moles × 2.02 g/mol
≈ 9.07 grams
Therefore, approximately 9.07 grams of hydrogen is needed to produce 51.0 grams of ammonia in the Haber process.
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What is one way that minerals crystallize from materials dissolved in water?
Answers
Answer:
From solutions that evaporate
From hot water solutions when the solution cools
Explanation:
The substances that can form minerals can be dissolved in the water to form a solution. Solution can be described as as a mixture in which a solute is dissolved in a solvent. When a particular dissolved solute evaporates from the solution, crystals of minerals might form. The mineral halite was formed when seas evaporated over a period of time.
The minerals can also be formed when a hot water solution gets cooled.
H2SO4 là axit hay bazơ
Answers
Explanation:
The Northville School Board has proposed this budget for the upcoming school year:
20% for school staff’s salaries
50% for school maintenance and upkeep
10% to refurbish the gymnasium
5% to upgrade the computer lab hardware
10% for new instruments for the music department
5% for new sports equipment
After a brief discussion, the school board revised the budget as follows:
20% for school staff’s salaries
50% for school maintenance and upkeep
10% to refurbish the gymnasium
10% to upgrade the computer lab hardware
5% for new instruments for the music department
5% for new sports equipment
In this case, the opportunity cost for
was
.
Answers
The opportunity cost for the new instruments for the music department is the 10% to upgrade the computer lab hardware
What is the opportunity cost here?The revision of the budget is that the school board had to redistribute the budget allocation for upgrading the computer lab hardware from 5% to 10%. This means that the school board had to make a trade-off in terms of allocating more budget for upgrading the computer lab hardware and less for other areas such as new instruments for the music department or new sports equipment.
This trade-off is known as the opportunity cost, as the school board had to give up the potential benefits of allocating more budget to those areas in order to allocate more budget to upgrading the computer lab hardware.
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The subatomic particle that is different in isotopes
Answers
Answer:
Neutrons
Explanation:
Subatomic particles are components atoms, and they include protons, electrons and neutrons. In different isotopes of an atom, the number of neutrons that the atom contains is what changes.
I hope this helps!
How would you make 100 mL of a carbonic acid buffer at 0.2 M and pH = 9.8 using 0.5 M NaHCO3 and either 0.1 M NaOH or 0.1 M HCl and water?
Answers
In order to make a 100 mL of a carbonic acid buffer at 0.2 M and pH = 9.8 using 0.5 M NaHCO₃ and either 0.1 M NaOH or 0.1 M HCl and water, one needs to add 0.5 M NaHCO₃ and either 0.1 M NaOH or 0.1 M HCl to achieve the desired pH.
How do you make a 100 mL of a carbonic acid?To make 100 mL of a 0.2 M carbonic acid buffer at pH = 9.8, you will need to add a sufficient amount of 0.5 M NaHCO₃ and either 0.1 M NaOH or 0.1 M HCl to achieve the desired pH.
Here is one way to do it:
Start by adding 50 mL of 0.5 M NaHCO₃ to a beaker or flask.Measure the pH of the solution using a pH meter or indicator.Add small aliquots of 0.1 M NaOH to the solution until the pH reaches 9.8.Alternatively, you can add small aliquots of 0.1 M HCl to the solution until the pH reaches 9.8.Once you have achieved the desired pH, add water to bring the total volume to 100 mL.Stir the solution well to ensure that it is well mixed.However, the exact procedure may vary depending on the specific requirements of your experiment.
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if a ph meter is not able to give an accurate measurement, it may need to be calibrated . this process requires two buffers of known ph .
Answers
It is true that if a pH meter is not able to give an accurate measurement, it needs to be calibrated and this process requires two buffers of known pH .
What should be done when pH meter does not give accurate measurement?The pH electrode is usually made of glass, therefore coatings on the glass surface can change the pH readings significantly. Coatings of pollutants, solids, biofilms, poorly soluble deposits, lime, or oils can make the glass surface inaccessible to measured medium.
To improve pH accuracy, you need to calibrate well and often. Electrode calibration is important in order to establish slope and the zero point of the electrode. As both of these can change with time, frequent calibration is needed.
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where is a tornado most likey from
Answers
Answer:
If I'm correct i believe that the answer is A.
Answer:
A. Where warm moist air masses traveling north collide with cool dry air masses traveling south
Explanation:
I got it right
Every morning, Jeremiah uses a blender to make a smoothie for breakfast. Which of the
following shows the energy transformation that the blender demonstrates?
А
Electrical - light
B
Chemical → mechanical
с
Mechanical → chemical
D
Electrical mechanical
Answers
Answer:
D
Explanation:
Answer:
D: Electrical -> mechanical
Explanation:
Hope this helps!
A certain large pond had many plants growing in it. It also had a population of fish living in it. One day, a chemical spilled into the water. This chemical caused the plants to die.
A scientist monitored the pond after the chemical spill. She found that the amount of dissolved oxygen in the pond gradually decreased. Once it reached about half of its original amount, the fish in the pond began to die.
Which statement best explains this information?
A. Fish produce oxygen through respiration, and this oxygen is used by plants.
B. All the oxygen in a pond comes directly from the atmosphere, so fish do not need plants.
C. Plants produce oxygen through photosynthesis, and fish depend on this oxygen to survive.
D. Fish and plants compete with each other for the dissolved oxygen in a pond.
Pls help!!
Answers
Answer:
Hi! your answer would be C. Plants produce oxygen through photosynthesis, and fish depend on this oxygen to survive.
Explanation:
I took the test and got this question right!
17. Which of the following statement best explains what pollination is?
A. It is the union of sperm and egg cell.
B. It is the process where the pollen of one flower reaches the stigma of another flower.
C. It is the process wherein plants are developed from seeds.
D. It is the process by which seeds are sent by their parent plant into a faraway place to
become a new plant.
Answers
Answer:
ıt is the projesi where the polen of one flower reaches the sığmaz of another flower.
Answer:
B
Explanation:
Have a nice day☺gsjsjamsvwksk
The combustion of 296 g of propane (C₃H₈) produces 713 g of carbon dioxide. [C₃H₈ + 5O₂ --> 3CO₂ + 4H₂O; C = 12.01 g/mol, H = 1.01 g/mol, O = 16.0 g/mol]
What is the percent yield?
80.5%
124%
0.805%
41.50%
Answers
Answer:
80.5%
Explanation:
The percent yield is made up of the theoretical yield and actual yield. The theoretical yield is the amount of product produced from the balanced chemical equation and molar masses. The actual yield is the amount of product produced in an experiment.
To find the percent yield, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio from equation coefficients), then (3) convert moles CO₂ to grams CO₂ (via molar mass), and then (4) calculate the percent yield. It is important to arrange the conversions/ratios in a way that allows for the cancellation of units.
(Steps 1 - 3)
Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.01 g/mol)
Molar Mass (C₃H₈): 44.11 g/mol
Molar Mass (CO₂): 12.01 g/mol + 2(16.0 g/mol)
Molar Mass (CO₂): 44.01 g/mol
1 C₃H₈ + 5 O₂ -----> 3 CO₂ + 4 H₂O
296 g C₃H₈ 1 mole 3 moles CO₂ 44.01 g
------------------- x ---------------- x ---------------------- x ---------------- = 886 g CO₂
44.11 g 1 mole C₃H₈ 1 mole
(Step 4)
Actual Yield
Percent Yield = ------------------------------ x 100%
Theoretical Yield
713 g CO₂
Percent Yield = ---------------------- x 100%
886 g CO₂
Percent Yield = 80.5%
The mass of 3.02 x 10^22 molecules of water is ___.
Answers
Answer:
0.9 g (approximately)
Explanation:
if 500 mL of Ag+ solution contain 1.0 mols of Ag+, what is the molarity of the solution
Answers
If 500 mL of Ag+ solution contain 1.0 mols of Ag+, what is the molarity of the solution
To calculate the molarity of the solution, we need to use the formula
Molarity = moles of solute / volume of solution in liters
We are given that the volume of the solution is 500 mL, which is the same as 0.5 L. We are also given that the solution contains 1.0 mole of Ag+.
Substituting these values into the formula, we get:
Molarity = 1.0 mol / 0.5 L = 2.0 M
Therefore, the molarity of the solution is 2.0 M.
Using the molarity formula, where molarity is equal to number of moles divided by volume(in liters) of the mixture is 2 mol/L.
Here, it is given that 500 mL of the Ag+ solution contains 1.0 mole of Ag+. To find molarity, the volume must first be converted to liters.
Solution volume = 500 mL = 500/1000 = 0.5 L
The molarity (M) can then be calculated using the following formula:
Molarity (M) equals moles of solute divided by the volume of solution (in liters).
Molarity = 1.0 mol / 0.5 L = 2.0 mol/L
As a result, the Ag+ solution has a molarity of 2.0 mol/L.
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Look at the equation for a displacement reaction. Which substance is reduced in the reaction? Give the full name, not the symbols.
Cl₂(g) + 2Fe²+ (aq) → 2Cl(aq) + 2Fe³+ (aq)
Answers
In the given displacement reaction Cl₂(g) + 2Fe²⁺ (aq) → 2Cl(aq) + 2Fe³⁺ (aq), the substance that is reduced in the reaction is Iron(II) ions (Fe²+).
What is displacement reaction?A displacement reaction, also known as a replacement reaction, is a chemical reaction where an element or ion in a compound is replaced by another element or ion. In this reaction, one reactant displaces another from a compound, resulting in the formation of a new compound.
Displacement reactions commonly occur in redox reactions, where there is a transfer of electrons between the reactants. The more reactive element or ion replaces the less reactive one in the compound.
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A solution contains 0.0150 M Pb2+(aq) and 0.0150 M Sr2+(aq) . If you add SO2−4(aq) , what will be the concentration of Pb2+(aq) when SrSO4(s) begins to precipitate?
Answers
Answer:
\(\large \boxed{1.10 \times 10^{-3}\text{ mol/L}}\)
Explanation:
1. Concentration of SO₄²⁻
SrSO₄(s) ⇌ Sr²⁺(aq) +SO₄²⁻(aq); Ksp = 3.44 × 10⁻⁷
0.0150 x
\(K_{sp} =\text{[Sr$^{2+}$][SO$_{4}^{2-}$]} = 0.0150x = 3.44 \times 10^{-7}\\x = \dfrac{3.44 \times 10^{-7}}{0.0150} = \mathbf{2.293 \times 10^{-5}} \textbf{ mol/L}\)
2. Concentration of Pb²⁺
PbSO₄(s) ⇌ Pb²⁺(aq) + SO₄²⁻(aq); Ksp = 2.53 × 10⁻⁸
x 2.293 × 10⁻⁵
\(K_{sp} =\text{[Pb$^{2+}$][SO$_{4}^{2-}$]} = x \times 2.293 \times 10^{-5} = 2.53 \times 10^{-8}\\\\x = \dfrac{2.53 \times 10^{-8}}{2.293 \times 10^{-5}} = \mathbf{1.10 \times 10^{-3}} \textbf{ mol/L}\\\\\text{The concentration of Pb$^{2+}$ is $\large \boxed{\mathbf{1.10 \times 10^{-3}}\textbf{ mol/L}}$}\)
(100 POINTS) Write the chemical formula of the ionic compound magnesium chlorate. The magnesium (Mg) ion has a +2 charge. Chlorate (ClO3) has a −1 charge.
A) Mg (ClO3)2
B) Mg2 (ClO3)
C) Mg2 (ClO3)
D) Mg (ClO3)
Answers
Answer:
A
Explanation:
since Mg has a charge of +2 and ClO3 has a charge of 1-, you need 2 ClO3 to cancel out the +2 since 2 ClO3 ions would have a 2- charge
Answer:
Mg(ClO3)2
Explanation:
i know my chemestry
Suppose that scientists want to study a feature of the galaxy that is very far away. They decide to use a telescope that observes high-energy gamma rays. Explain why this would be a good choice.
Answers
Answer & Explanation:
Gamma rays are the most energetic form of electromagnetic radiation. By observing the distant galaxy at gamma-rays, scientists can search for new physics, test theories, and perform experiments that are not possible in earth-bound laboratories.
Which model shows a molecule of a substance that is made up of three elements
Answers
Answer:
c or d
Explanation:
i tried a and it was wrong. its not B. and i cant see the rest. its the one that looks like a catipillar tho
Answer:
Its not A or B
Explanation:
Please solve this worksheet of chemical reactions.
Answers
Answer:
hgvghhshshh3hrurudus
As the temperature increases from 0°C to 25°C the amount of NH3 that can be dissolved in 100 grams of water.
A) decreases by 10 grams
B) decreases by 40 grams
C) increases by 10 grams
D) increases by 40 grams
Answers
Answer:
decreases by 10 gram
Explanation:
HELP ASAP PLEASE ANSWER BOTH OF THESE QUESTIONS! I WILL GIVE YOU BRAINELIST IF YOU ANSWER IT!
Answers
Answer:
because it absorbs all colours expect for red,
Explanation: making the red light bounce into your eyes, therefore seeing the colour red
Question 2: The wave transfers its energy to the mineral, I think, thats my best guess
helppp, its equation balancing!
the answer is C but how?
Answers
Answer:
12
Explanation:
it's because the question is ,,,the balance of a and c if u count the letter a its equal to 14 then if u count the letter c its equal to 10 so the letter a give to letter c a 2 that's why we can balance into 12 the letter a become 12 and letter c become 12 also.