A student was adding NaOH to two different acid solutions, HCl and HF, until a pH of 7 was reached in both solutions. The acids had the same initial volume, and both had an initial pH of 4.5. Which statement is true regarding the amount of NaOH added to each acid?

Answers

Answer 1
NaOH added for HCl will be more than NaOH added for HF


Related Questions


Al saltar una persona del Bungee se observa que las cuerdas con las que se sujeta muestran un
grado de estiramiento por el peso y la velocidad que alcanza, una vez que ya no hay movimiento,
las cuerdas retoman su forma original. ¿Qué propiedad física se presenta?

Answers

La propiedad física es la elasticidad.

La elasticidad es la capacidad de un material para extenderse cuando está bajo la acción de una fuerza de estiramiento y volver a su forma original cuando se elimina la fuerza de estiramiento.

Cuando la persona que salta sostiene el bungee, se encuentra que se estira y vuelve a su forma original cuando no hay más movimiento. El bungee puede considerarse elástico.

Este es un ejemplo de la propiedad física llamada elasticidad.

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A tire pressure gauge reads 33.0 pounds per square inch. How many kPa is this?

Answers

Answer:

227.5kpa

Explanation:

Tyre pressure is the air pressure present in the tubes of the tires to maintain the grip and movement. The tire pressure gauge will be 227.527 kPa.

What are pascal and pSI?

Pascal is the SI unit of the air pressure and hydraulic pressure, whereas the pounds per square inch is the imperial unit of the air pressure measurement.

We know, that 1 (PSI)  pounds per square inch are equivalent to 6,895 Pa. Then, 33 PSI will be:

[tex]33 \times 6,895 = 227,527.08 \;\rm Pascals[/tex]

If one kilopascal contains 1000 pascals, therefore, 227,527.08 Pa contains,

[tex]\dfrac{ 227,527.08}{1000}= 227.527 \;\rm kPa[/tex]

Therefore, 227.527 kPa is equivalent to 33 PSI.

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Correct answers only please

Answers

Answer:

Delta. Aldehyde

Explanation:

What is photosynthesis ? ​

Answers

[tex] \huge \boxed{\mathfrak{Question} \downarrow}[/tex]

What's photosynthesis?

[tex] \large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}[/tex]

Photosynthesis is the process in which green plants derive their food (nutrients and water) through the capturing of light energy (sunlight) and using it to convert carbon dioxide (CO2) and water (H2O) into oxygen (O2) and other substances (compounds) that are rich in energy. Chlorophyll a green pigment present in plants is used in this process.

__________________

Formula ⟶ [tex]\boxed{\bf\:6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2} [/tex]

__________________

So, the products of photosynthesis are [tex]\large\boxed{\boxed{\bf\:C_6H_{12}O_6 + 6O_2}}[/tex]

what is the oxidation number of chloride ion HClO ?​

Answers

The oxidation state of Cl is +1

Calculate the percentage of limestone that dissolved from each solution. Start by subtracting the final mass from the initial mass. Divide that number by the initial mass. Then multiply the result by 100 to make it a percent. Use this formula:


% dissolved= initial mass- final mass/ initial mass x 100

ORIGINAL: 0% Acid 33% Acid 66% Acid 100% Acid

Initial Mass (g) 10.0 10.1 10.0 9.9

Final Mass (g) 10.0 10.0 9.8 9.5


Record the percentage of limestone dissolved in each acid concentration.
Look at attched...

Answers

9514 1404 393

Answer:

  see attached

Explanation:

It works nicely to let a spreadsheet do the calculations described in your problem statement.

You don't actually have to multiply by 100 to make the number a percent. Spreadsheets have the capability to show a value as a percentage just by changing the format.

How many joules are equivalent to 450 calories?

Answers

Answer:

Below

Explanation:

To convert calories to joules, you need to multiply the value by 4184

     450 x 4184 = 1882800 J

If your teacher requires you to round to significant figures, you would round to 2 sig figs as 450 only has 2 sig figs

     450 x 4184 = 1.9 x 10^6

Hope this helps! Best of luck <3

50 POINTS!!!! What is the approximate amount of the leftover reactant?
O 8.2 g of sulfuric acid
O 9.8 g of sulfuric acid
0 11.43 g of aluminum hydroxide
O 13.76 g of aluminum hydroxide

Answers

Answers: The answer is A

Explanation:

correct me if I'm wrong

Identify all the signs of a chemical change in the description below:

A clear liquid is placed in a beaker and heated. As the liquid is heated, bubbles form and, gradually, the liquid decreases in the container.

Answers

Answer:

When a substance undergoes changes in its chemical composition or combines with another substance to form a new substance is referred to as chemical change. In contrast, physical change is defined as the change in appearance or state of matter and not the chemical composition of the substance.

Explanation:

When a clear liquid is boiled or heated, the kinetic energy of the molecules increases, and the evaporation of the liquid takes place faster. For example, evaporation is a type of physical change, in which the liquid is heated to form bubbles or vapors. These vapors rise in the air and decrease the volume of the liquid. In this process, the liquid has only changed its state of matter (liquid to gas) and not the chemical composition. Thus, there is no chemical change taking place in the heating of water and only physical change is taking place.

Help me:what helium
and what use

Answers

Answer:

the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.

Explanation:

Because it is very unreactive, helium is used to provide an inert protective atmosphere for making fibre optics and semiconductors, and for arc welding. Helium is also used to detect leaks, such as in car air-conditioning systems, and because it diffuses quickly it is used to inflate car airbags after impact.

Which part of the atom cannot have its location accurately determined and is modeled by a cloud around the center of the
atom?

Answers

Answer:

the electron

Explanation:

Would overheating be a stimulus or a
response?
Stimulus
Response

Answers

Answer:

stimulus response

Explanation:

its stimulus response

Sublimation cannot be used to separate a mixture of salt and sand.Give reason.​

Answers

Answer:

because salt cannot be changed into gas by heating.

Answer:

Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase. Explanation: sand and salt can not be separated through the method of sublimation because none of the two can show sublimation(even when heated).

Explanation:

What is the mass of 4.99×1021 platinum atoms?

Answers

Answer:

[tex]\boxed {\boxed {\sf 1.62 \ g \ Pt}}[/tex]

Explanation:

We are asked to find the mass of a number of platinum (Pt) atoms.

1. Convert Atoms to Moles

First, we convert atoms to moles using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are platinum atoms.

We will convert using dimensional analysis so we set up a ratio using the information we know (6.022 × 10²³ platinum atoms in 1 mole of platinum).

[tex]\frac {6.022 \times 10^{23} \ atoms \ Pt}{ 1 \ mol \ Pt}[/tex]

We are converting 4.99 ×10²¹ atoms of Pt to moles of Pt, so we multiply by this value.

[tex]4.99 \times 10^{21} \ atoms \ Pt *\frac {6.022 \times 10^{23} \ atoms \ Pt}{ 1 \ mol \ Pt}[/tex]

Flip the ratio so the units of atoms of platinum cancel.

[tex]4.99 \times 10^{21} \ atoms \ Pt *\frac { 1 \ mol \ Pt}{6.022 \times 10^{23} \ atoms \ Pt}[/tex]

[tex]4.99 \times 10^{21} *\frac { 1 \ mol \ Pt}{6.022 \times 10^{23}}[/tex]

[tex]\frac { 4.99 \times 10^{21}}{6.022 \times 10^{23}} \ mol \ Pt[/tex]

Divide.

[tex]0.008286283627 \ mol \ Pt[/tex]

2. Convert Moles to Grams

Next, we convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. This is found on the Periodic Table because it is equivalent to the atomic mass, but the units are grams per mole instead of atomic mass units. Look up platinum's molar mass.

Pt: 195.08 g/mol

Set up another ratio using this new information (195.08 grams of Pt in 1 mole of Pt).

[tex]\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}[/tex]

Multiply by the number of moles we just calculated.

[tex]0.008286283627 \ mol \ Pt*\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}[/tex]

The units of moles of platinum cancel.

[tex]0.008286283627*\frac {195.08 \ g \ Pt}{ 1 }[/tex]

[tex]0.008286283627* {195.08 \ g \ Pt}[/tex]

[tex]1.61648821\ g \ Pt[/tex]

3. Round

The original measurement of atoms ( 4.99 ×10²¹ ) has 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 6 in the thousandth place tells us to round the 1 up to a 2.

[tex]1.62 \ g \ Pt[/tex]

There are approximately 1.62 grams of platinum in 4.99 ×10²¹ atoms of platinum.

(giving brainlist! What should a simplified model of a large molecule like glucose show?

Answers

it will show 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms

Glucose is a carbohydrate and monosaccharide sugar molecule that is the energy source for organisms. The simplified model of a glucose molecule will show six carbon atoms, six oxygen atoms, and twelve hydrogen atoms.

What is glucose?

Glucose is one of the monosaccharide sugar that is the most abundant energy source with a molecular formula of C₆H₁₂O₆. It consists of carbon, hydrogen, and oxygen atoms with a molecular mass of 180.156 g/mol.

It is a sugar-containing aldehydic group with a six-carbon making it aldohexoses. It is found in honey and fruits that are the source of the energy and regulates metabolic and cellular reactions.

Therefore, the molecular structure of glucose contains six carbon, twelve hydrogens, and six oxygen atoms.

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How many molecules are present in 2 H₂ SO4​

Answers

Answer:

1 mol of H2SO4 contains 6.022 x 10^23 molecules. : 0.5 mol of H2SO4 contains 0.5 x 6.022 x 10^23 molecules. = 3.011 x 10^23 molecules . that is 49 g of H2SO4 contains 3.011 x 10^23 molecules of H2SO

Explanation:

Perform each calculation to the correct number of significant figures.
(a) 89.3 * 77.0 * 0.08
(b) (5.01 * 105) , (7.8 * 102) (c) 4.005 * 74 * 0.007
(d) 453 , 2.031

Answers

Answer:B

Explanation:

Please help me please ​

Answers

Answer:

Sugar solution seperation method is Distillation

iron power and sand separation method is Magnetic separation

Petrol and diesel separation method is Fractional Distillation

Camphor and glass powder seperation method is Sublimation

I hope this will have you

have a great day

What is an atomic number

Answers

Answer:

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place on the periodic table

4. Select the measurement that is consistent with the uncertainty of each instrument.
(a) METRIC RULER A: 10 cm, 10.0 cm, 10.00 cm
(b) METRIC RULER B: 10 cm, 10.0 cm, 10.00 cm
(c) decigram balance: 10.0 g, 10.00 g, 10.000 g
(d) centigram balance: 10.0 g, 10.00 g, 10.000 g
(e) milligram balance: 10.0 g, 10.00 g, 10.000 g
(f) graduated cylinder: 10 mL, 10.0 mL, 10.00 mL
(g) Celsius thermometer: 10 °C, 10.0 °C, 10.00 °C

Answers

The correct measurements has an uncertainty of ±0.01.

What is the metric system?

The metric system of measurement is a system of measurement that makes use of the meter, litre and gram as units. With every measurement, there is a level of uncertainty.

The uncertainly that goes with each measurement usually lies between ±0.01. Hence the correct measurements has an uncertainty of ±0.01.

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1.Volume of liquid in
a. 10 mL graduated cylinder

How many significant figures in this measurement?

Answers

Answer:

1 significant figure.

Explanation:

Since 10 does not have any decimals in it, we count the zeros from right to left. Doing this leaves us with one sig fig.

Someone help answer this for me tysm

Answers

energy, kinetic, potential

Answer:

Energy, Kinetic, Potential

Explanation:

Kinetic and Potential is energy

Kinetic is energy in motion and Potential is stored motion.


Why do other elements need to bond with one another?

Answers

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it.

Answer:

In order for that element to gain stability

Which of the following are exact numbers? (Check all that apply.)
1000 meters in one kilometer.
The diameter of a coin, 10.2756mm (millimeters)
A dozen eggs.
16 ounces in 1 pound.
The length of a pen, 12mm (millimeters)

Answers

For the given options we found that the following are examples of exact numbers:

1000 meters in one kilometer is an exact numberA dozen eggs is an exact number. 16 ounces in 1 pound is an exact number.

To find which of the given examples are exact numbers, we need to recall its definition. In simple words, an exact number is a number that can be counted without uncertainties, usually is an integer one.

A number that is determined with uncertainties with a finite number of significant digits or thought an instrument is not an exact number (is a measured one).      

Now, let's evaluate each option.    

a) 1000 meters in one kilometer      

This is an exact number because we know for certain that in 1 kilometer there are 1000 meters. All the conversion of units like meters to kilometers, grams to kilograms are examples of exact numbers.  

b) The diameter of a coin, 10.2756 mm  

This is not an exact number, because the diameter found has a finite number of significant digits, which means that the measurement has an uncertainty in the final decimal position. Also, this diameter was found with an instrument.    

c) A dozen eggs

A dozen is a number that can be counted with certainty, so it is an exact number.  

d) 16 ounces in 1 pound

This is like example "a". Since we know for sure that in 1 pound we have 16 ounces, this is an exact number.

e) The length of a pen, 12 mm

Although the number 12 mm is an integer, this is not an exact number because this dimension was measured. We do not know for sure that the dimension of a pencil is 12 mm, we can not count it.      

                                                 

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What's the major difference between carbon and other group IV elements, excluding allotropy​

Answers

Answer:

Carbon has an ability of catenation which other group IV elements lack.

Explanation:

Catenation is the ability for an element to form multiple bonds with other elements leading rise to long chains of compounds.

An example is organic compounds.

[tex].[/tex]

Substance A is a gas, Substance B is a liquid and Substance C is a solid. All of the substances are at the same temperature and pressure. Which of the following shows the correct relationship of the strength of the intermolecular forces in each substance?

Answers

Answer:C

Explanation:

Select all the correct answers.
What are the characteristics of prokaryotes?
A prokaryote lacks a well-defined nucleus.
A prokaryote cannot perform basic life functions.
A prokaryote lacks cell organelles.
A prokaryote is larger than a eukaryote.

Answers

eu vou colocar V(verdadeiro) F (falso)

1:F  

2:F

3: V

4:F

explicação:

1 procariontes não apresentam núcleo

2 eles podem sim caso  contrário os seres procariontes não sobreviveriam

3   ele possui organelas celulares

4 as células eucariontes são maiores e mais complexas.

CONCLUSÃO: a resposta certa é a 3

Calculate the number of kilograms of sodium fluoride needed per year for a city of 100,000 people if the daily consumption of water per person is 150.0 gallons.

Answers

Fluoridation is the process of adding fluorine to drinking water to avoid tooth decay.

The question is incomplete; the complete question is;

Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons.

(Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon = 3.79 L; 1 year = 365 days; 1 ton = 2000 lb; I lb = 453.6 g; density of water = 1.0 g/mL.)

The quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons is [tex]9.32 * 10^9 Kg[/tex].

From the question, we know that;

Daily consumption of water per person = 150 gallons.

Population of the city = 100,000 people

Total daily city consumption =[tex]100,000 *  150 gallons = 15 * 10^6 gallons[/tex]

Annual water consumption = [tex]15 * 10^6 gallons * 365 = 5.475 * 10^9 gallons[/tex]

1 gallon = 3.785 L = 3.785 kg

[tex]5.475 * 10^9 gallons = 5.475 * 10^9 gallons * 3.785 kg/ 1 gallon = 2.1 * 10^10 Kg[/tex]

Since sodium fluoride accounts for 45% by mass of water

Mass of sodium fluoride= [tex]0.45 * 2.1 * 10^10 Kg= 9.32 * 10^9 Kg[/tex]

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Difference between hydrocarbons and organic compounds

Answers

Answer:

hydrocarbons contain both Hydrogen and Carbon while organic compounds

are compounds in which  one or more atoms of Carbon are  covalently linked

with  other elements

Explanation:

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Find the volume of 1760 grams of copper

Answers

Answer:

(1760 ÷ 64) x 24.4 =671dm^3

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