Answer: The number of moles of sodium hydroxide required to reach the endpoint is 0.00128
Explanation:
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution in ml}}[/tex]
Molarity of [tex]NaOH[/tex] solution = 0.100 M
Volume of [tex]NaOH[/tex] solution = 12.8 mL
Putting values in equation, we get:
[tex]0.100M=\frac{\text{Moles of}NaOH\times 1000}{12.8ml}\\\\\text{Moles of }NaOH=\frac{0.100mol/L\times 12.8}{1000}=0.00128mol[/tex]
Thus the number of moles of sodium hydroxide required to reach the endpoint is 0.00128
Which is an advantage of selling plant fertilizer as a powder rather than as a liquid?
Choose one.
A. The powder must be stored in a childproof container.
B.Transportation costs are reduced.
C.The powder may be a health hazard if proper procedures are not followed during mixing.
D.The gardener has to be able to read directions carefully and mix the proper amount of solvent and solute.
Answer:A
Explanation: because i saw the sheet
4. Diffuse reflection occurs when parallel light waves strike which surface?
Answer:
rough surface
Explanation:
Diffuse reflection occurs when parallel light waves strike a rough surface
Answer:
Rippling fountain
Explanation:
A student burns 1.50 mol C3H8 according to the following reaction:
C3H8 + 5O2 3CO2 + 4H2O.
How many grams of carbon dioxide are produced?
a. 1.98 × 10² g
b. 1.32 × 10² g
c. 4.40 × 10¹ g
d. 6.61 × 10¹ g
Answer:
I think the answer is A. 1.98 x 10^2 g
Meredith mixes together 5 grams of baking soda and 5 grams of vinegar in a test tube that is not sealed. She then weighs the product and
finds that it weighs 9 grams. Mathew conducts the same experiment, except in a sealed bag. He finds that 5 grams of baking soda and 5
grams of vinegar will result in 10 grams of product. Which of the following might account for their different findings?
O A. Some of the mass was created during the reaction between vinegar and baking soda in the bag.
OB. Some of the mass of the reactants was converted to light.
O C. Some of the mass escaped from the test tube as a gas before it was massed.
OD. Some of the mass from the test tube was destroyed.
Answer:
simple chemistry experiment—adding baking soda to vinegar—seems to challenge the law of conservation of mass.
Some of the mass escaped from the test tube as a gas before it was massed. Hence option C is correct.
What is experiment?Experiment is defined as a process used to confirm or deny a hypothesis, as well as assess the likelihood or effectiveness of a previously untested idea. Additionally, experiments are used by researchers to confirm or refute new or current theories. The structure or mathematical form of a theory can be hinted at by an experiment, and it can also provide proof that the entities involved in our theories actually exist.
Something new is created when vinegar and baking soda are combined. Carbon dioxide gas soon foams up in the mixture. All of the baking soda can be made to react and dissolve into the vinegar solution if enough vinegar is utilized.
Thus, some of the mass escaped from the test tube as a gas before it was massed. Hence option C is correct.
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What is the molarity of a solution that contains 45 mEq Ca“ per liter?
Answer:
0.0225 M
Explanation:
In one liter of this solution, there are 45 mEq of Ca⁺².
1 mEq of Ca⁺² is equal to 20 mg of Ca⁺. We know this by dividing its molar mass (40) by the charge of the ion (2).
Meaning that 45 mEq of Ca⁺² is equal to (45 * 20) 900 mg of Ca⁺².
Now we convert 900 mg of Ca⁺² into moles, using its molar mass:
900 mg / 1000 = 0.9 g0.9 g Ca⁺² ÷ 40 g/mol = 0.0225 mol Ca⁺²Finally we calculate the molarity of the solution:
Molarity = moles / liters0.0225 mol / 1 L = 0.0225 MWhich of the following describes an exothermic reaction?
O A. AHt, reactants > AHf, products
B. AHF, reactants = AHf, products
O C. AHf, reactants = 0
O D. AHF, reactants < AHt, products
The option A describes an exothermic reaction.
i.e, ΔHt,reactant > ΔHt, product
What is exothermic reaction?The reaction in which energy is release during the formation of reaction is called exothermic reaction.
Mathematically,
ΔHf = ΔH(product) - ΔH(reactant)
For exothermic reaction, ΔHt,reactant > ΔHt, product
So,for exothermic reaction, ΔHf is negative.
Where,
ΔHf = Enthalpy of formation of reaction
ΔH(product) = enthalpy of formation of product
ΔH(reactant) = enthalpy of formation of reactant
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Pretty easy question if you know science. 20 Points
A piece of nickel at 25 °C is dropped into a glass of water at 25 °C. Which statement is correct?
Heat will flow from the nickel to the water in the glass.
Heat will flow from the water in the glass to the nickel.
There will be no transfer of heat from the nickel to the water in the glass.
The final temperature of water and nickel will be 0 °C.
Answer:
C.
Explanation:
because the heat From the nickel and the heat from the water are the same.
As a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.
To answer the question, we need to know what heat transfer is.
What is heat transfer?This is the flow of heat energy from one body to another over a temperature gradient.
Heat transfer between Nickel at 25 °C and water at 25 °C.
Since a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there is no temperature gradient, since, both bodies are at the same temperature. Thus, no heat is transferred from the nickel to the water.
So, as a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.
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I have no clue how to even start this, any help is appreciated!
A sample of 2.54 moles of iron (III) oxide is reacted with 4.56 moles of carbon monoxide to produce iron metal and carbon dioxide. Using the balanced equation below, predict which is the limiting reactant and the maximum amount in moles of carbon dioxide that can be produced.
Fe2O3 + 3CO → 2Fe + 3Co2
A. Iron (III) Oxide, 7.62 moles
B. Carbon monoxide, 5.34 moles
C. Iron (III) oxide, 2.63 moles
D. Carbon monoxide, 4.56 Moles
Answer:
Option D. Carbon monoxide, 4.56 Moles
Explanation:
The balanced equation for the reaction is given below:
Fe₂O₃ + 3CO —> 2Fe + 3CO₂
From the balanced equation above,
1 mole of Fe₂O₃ reacted with 3 moles of CO to produce 3 moles of CO₂.
1. Determination of the limiting reactant.
From the balanced equation above,
1 mole of Fe₂O₃ reacted with 3 moles of CO.
Therefore, 2.54 moles of Fe₂O₃ will react with = 2.54 × 3 = 7.62 moles of CO.
From the calculation made above, we can see that it will take higher amount of CO (i.e 7.62 moles) than what was given (i.e 4.56 moles) to react completely with 2.54 moles of Fe₂O₃. Therefore, CO is the limiting reactant and Fe₂O₃ is the excess reactant.
2. Determination of the maximum amount of carbon dioxide CO₂ produced.
In this case, the limiting reactant will be used since all of it is consumed by reaction.
The limiting reactant is CO and the maximum amount of CO₂ produced can be obtained as follow:
From the balanced equation above,
3 moles of CO reacted to produce 3 moles of CO₂.
Therefore, 4.56 moles of CO will also react to produce 4.56 moles of CO₂.
Thus, the maximum amount of CO₂ produced is 4.56 moles
Summary:
Limiting reactant => carbon monoxide, CO
Maximum amount of carbon dioxide, CO₂ produced = 4.56 moles
Thus, option D gives the correct answer to the question.
how many atoms are in 4 H2PO4
Answer:
7
Explanation:
just add p has 1 o has 4 and h has 2
Which change absorbs heat?
A. Firing a rifle
B. Freezing water into ice
C. Melting cheese
D. Breaking rocks with dynamite
What is in between the nucleus and electrons of an atom?
Answer:
The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum. ... Electrons are thus 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself.
what do The representative elements include
Answer:
aajajjajajajajajajajajdsjsjjx jajajjajajajajaisjn
Explanation:
Is grilling a ham and cheese sandwich and chemical or physical change?
Answer:
Physical
Explanation:
I say physical because if you just think about the cheese it wasnt melted before u put that heat on it .
In the Determination of an Equilibrium Constant lab, you will react acetic acid with ethanol in the presence of sulfuric acid until equilibrium is established. Then, you will titrate the equilibrium mixture with NaOH to determine the acetic acid concentration. Suppose you determine that the added sulfuric acid requires 2.97 mL of NaOH to be neutralized in a blank solution. The equilibrium mixture requires 12.92 mL of NaOH to reach the endpoint. What volume of NaOH should you use to calculate the acetic acid concentration at equilibrium
Answer:
9.95mL is the volume of NaOH that you must use
Explanation:
In the problem, you have in your blanck the presence of an acid as sulfuric acid. That means the blank requires an amount of NaOH to neutraliz its solution.
The volume required for the sample will be:
Volume of the sample - Volume of the blank
Beacuse we don't have to take into account the acidity of the blanck
12.92mL - 2.97mL =
9.95mL is the volume of NaOH that you must useIn terms of activation energy, why does increasing the temperature of a
reaction make it proceed more quickly?
A. Increasing the temperature reduces the activation energy.
B. Increasing the temperature increases the potential energy of the
reactants.
O C. Increasing the temperature increases how many reactant
molecules reach activation energy.
D. Increasing the temperature makes the molecules move slower.
Increasing the temperature increases the potential energy of the reactants, thus making the reaction faster.
What is activation energy?Activation energy is the minimum energy that reactant molecules must possess in order to collide together to form products.
Increasing the temperature of a reaction helped to make the reaction proceed faster. This is because more reactant particles acquire the energy greater than or equal to the activation energy.
Therefore, increasing the temperature of a reaction makes it proceed more quickly.
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Approximately how far will a p-wave travel in 4 minutes?
Answer:
2000 (km)
Explanation:
:)
please help due in 1 hour. This is 7th grade science. & in return I’ll help you on something! 15 points
Answer: MCCCMC
Please. Mark as brainliest
For the reaction
3KOH+H3PO4⟶K3PO4+3H2O
how many grams of phosphoric acid, H3PO4, are needed to react completely with 89.7 g of potassium hydroxide, KOH?
Answer:
52.2 g
Explanation:
Step 1: Write the balanced equation
3 KOH + H₃PO₄ ⟶ K₃PO₄ + 3 H₂O
Step 2: Calculate the moles corresponding to 89.7 g of KOH
The molar mass of KOH is 56.11 g/mol.
89.7 g × 1 mol/56.11 g = 1.60 mol
Step 3: Calculate the moles of H₃PO₄ needed to react with 1.60 moles of KOH
The molar ratio of KOH to H₃PO₄ is 3:1. The moles of H₃PO₄ needed are 1/3 × 1.60 mol = 0.533 mol.
Step 4: Calculate the mass corresponding to 0.533 moles of H₃PO₄
The molar mass of H₃PO₄ is 97.99 g/mol.
0.533 mol × 97.99 g/mol = 52.2 g
CAN SOMEONE PLEASE HELP ME LIKE ACTUALLY !
Atlantic Ocean has been expanding for millions of years. This is because of
volcanoes and earthquakes under the ocean.
plate collisions under the oceans.
convergent boundary.
spreading plates on the sea floor.
(つ ◕.◕ )つ Hey there again!
Answer → Last one Spreading Plates on the Sea Floor
✨Hope this helps✨
Which substance is not a fossil fuel?
8. The protein in a 1.2846-g sample of an oat cereal is determined by a Kjeldahl analysis. The sample is digested with H2SO4, the resulting solution made basic with NaOH, and the NH3 distilled into 50.00 mL of 0.09552 M HCl. The excess HCl is back titrated using 37.84 mL of 0.05992 M NaOH. Given that the proteins in grains average 17.54% w/w N, report the %w/w protein in the sample.
Answer: The %w/w protein in the sample is 15.2 %
Explanation:
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}[/tex]
[tex]\text{Moles of} HCl={0.09552\times 50.00}{1000}=0.0047moles[/tex]
[tex]\text{Moles of} NaOH={0.05992\times 37.84}{1000}=0.0023moles[/tex]
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
According to stoichiometry :
1 mole of [tex]NaOH[/tex] require 1 mole of [tex]HCl[/tex]
Thus 0.0023 moles of [tex]NaOH[/tex] will require=[tex]\frac{1}{1}\times 0.0023=0.0023moles[/tex] of [tex]HCl[/tex]
moles of HCl used = (0.0047-0.0023) = 0.0024
[tex]NH_3+HCl\rightarrow NH_4Cl[/tex]
1 mole of HCl uses = 1 mole of ammonia
Thus 0.0024 moles uses = [tex]\frac{1}{1}\times 0.0024=0.0024moles[/tex] of ammonia
Mass of ammonia= [tex]moles\times {\text {Molar mass}}=0.0024\times 17g/mol=0.0408g[/tex]
17 g of ammonia contains = 14 g of Nitrogen
Thus 0.0408 g of ammonia contains = [tex]\frac{14}{17}\times 0.0408=0.034 g[/tex] of Nitrogen
Now 17.45 g of Nitrogen is present in = 100 g of protein
Thus 0.034 g of Nitrogen is present in =[tex]\frac{100}{17.45}\times 0.034=0.195g[/tex] of protein
Now % w/w of protein = [tex]\frac{0.195}{1.2846}\times 100=15.2\%[/tex]
Thus %w/w protein in the sample is 15.2%
If the proteins in grains average 17.54% w/w N, the % w/w protein in the sample is 15.2 %.
What is Kjeldahl analysis?It is a process of converting nitrogen present in any compound into ammonium sulfate.
Step1: calculating the moles by the formula of molarity
molarity × volume
M = 0.09552, V = 50.00 mL =0.05 L
Moles of HCl
[tex]0.09552 \times 0.05 = 0.0047\;mol\\[/tex]
Moles of NaOH
[tex]0.05992 \times 0.03784 = 0.0023 \;mol[/tex]
Moles of HCl used is 0.0047 - 0.0023 = 0.0024
Step2: calculating the mass of ammonia
moles × molar mass
[tex]0.024 \times 17\;g/mol = 0.0408\;g[/tex]
Now, 17 grams of ammonia have 14 grams of nitrogen
so, 0.0408 g ammonia have [tex]\dfrac{14}{17} \times 0.0408 = 0.034[/tex]
In 100 g of protein, there is 17.45 g of nitrogen
So, 0.034 g N have [tex]\dfrac{100}{17.45} \times 0.034 = 0.195 g.\\[/tex]
Step3: calculating the % w/w
[tex]\dfrac{0.195}{1.2846} \times 100 = 15.2 \%[/tex]
Thus, the % w/w is 15.2 %
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13. Describe the flow of thermal energy.
Plz help
Answer: Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. ... This energy is usually in the form of low-level thermal energy. Here, low-level means that the temperature associated with the thermal energy is close to that of the environment. hope this helps. Can u pls give me brainliest
Explanation:
Organelles carry out specif functions within the cell. True False
Answer:
true
Explanation:
vitamin can act like some thing what are those thing and how?
Answer:
Some nutrients also act as antioxidants. These may be vitamins, minerals, proteins, or other types of molecules. They help the body remove toxic substances known as free radicals, or reactive oxygen species. If too many of these substances remain in the body, cell damage and disease can result.
4. Why does iron corrode faster in salt water?
~My Answer~:
Water is the enabler of fast oxidation of iron so freshwater will also cause rust. However, salt water is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water.
Which statement is true about a polyatomic ion?
Answer:
The correct answer is that it is made of atoms that are covalently bonded together.
Explanation:
Hope this helped Mark BRAINLEST!!!
PHMWMHW(14 points):))));)))))
Answer:
a silly
Explanation:
Two people are pushing a couch from opposite sides. One person is pushing to the right with a force of N. The other person is pushing to the lell William
4 N. Which of the following best describes the movement of the couch?
A. The couch will move to the left with a force of IN
B. The couch will not move.
C. The couch will move to the right with a force of 7 N
D. The couch will move to the left with a force of 7N
Answer:
The couch will not move because the people are not working together. Maybe if they call someone to help they can make some progress.
2. Which of the following are reactants of photosynthesis? *
a. carbon dioxide, water and light energy
b. glucose and oxygen
c. carbon dioxide, water and ATP
d. carbon dioxide, glucose and light energy
Answer:
A is the answer.
i need help can someone help. pls