Phenolphthalein meaning

Answers

Answer 1

Answer:

Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.

Answer 2

Answer:

Phenolphthalein is a chemical compound, a colorless crystalline solid, though pink in a alkaline solution, and is also used as an acid-base indicator.

Explanation:


Related Questions

How many moles are in a 28.35 g sample of CaCO3?

Answers

Answer:

0.2832 moles

Explanation:

mole = mass/ molar mass

mole= 28.35/100.08

mole=0.2832

0.2832 is your answer! Have a good day or night

How many liters of F2 do you have if you are given 100 grams of F2?

Answers

0.100000 should be the answer

fuerza que ejerce el planeta tierra sobre los cuerpos que en ella se encuentran. Fuerza de distancia Fuerza de Contacto

Answers

Answer:

Ver explicacion

Explanation:

La gravedad es una fuerza que actúa a distancia. La fuerza que actúa entre la tierra y los cuerpos en ella es la fuerza gravitacional.

Es un ejemplo típico de una fuerza de acción a distancia.

Por lo tanto, la fuerza tat que existe entre la tierra y los cuerpos que se encuentran en ella es una fuerza de distancia.

To calculate the work that an object does when it moves covering a distance of 3000 meters when it is propelled by a force of 65 Newton, one of the principles of mechanics must be considered.

Physical principle of mechanics

A force does work when there is a displacement of the center of mass of the body on which the force is applied, in the direction of said force.

The work of the force on that body will be equivalent to the energy necessary to displace it, so that:

W = F.d

Force Calculation

Substituting the corresponding values in said formula:

F = 65N

d = 3000m

W = 65 N. 3000 m

W = 195000 W

Learn more about force calculations at https://brainly.com/question/23775339 #SPJ4

what is the variable for the quantity of heat in a system?

Answers

Answer:

The heat capacity is the amount of heat, expressed usually in Joules or calories, needed to change the system by 1 degree Celsius. The specific heat capacity is the amount of heat required to raise 1 gram of a substance by 1 degree Celsius.

Explanation:

For example, the specific heat of H2O(l) is 4.18 J/g ° C.

1. Predict what will happen when the plastic bag is let go.

Answers

Answer:

If its windy it will fly away. If its not windy I think it will float down to the ground

Explanation:

The wind will blow it away and the bag will be skipping from the city

Is all the biomass consumed by a primary consumer, such as a brine shrimp, transferred to the secondary consumer, such as a gull, when the brine shrimp is eaten? For instance, if a brine shrimp eats 10 g of algae in its life before the gull eats it, does the gull get 10 g of biomass when it eats the brine shrimp? Why or why not?​

Answers

Okkkkkkjjjjkdnhehdydyegevevevbenrjrjrjduueuegeveveve

When 1 mol of methane is burned at constant pressure, −890 kJ/mol of energy is released as heat. If a 1.67 g sample of methane is burned at constant pressure, what will be the value of ∆H

Answers

Answer:

[tex]\Delta H=-92.7kJ[/tex]

Explanation:

Hello there!

In this case, according to the given information, we can infer that 890 kJ of energy are released when 1 mole of methane is burned; however, to find the total heat when 1.67 grams are burned, we first need to calculate the moles in this mass of methane:

[tex]1.67gCH_4*\frac{1molCH_4}{16.04gCH_4}=0.104molCH_4[/tex]

And thus, for calculating the resulting ∆H, we proceed as follows:

[tex]\Delta H=-890kJ/mol*0.104mol\\\\\Delta H=-92.7kJ[/tex]

Regards!

Which of the following best describes asexual reproduction?

it produces offspring with a large amount of genetic variation

it occurs in simple organisms, such as bacteria, but not in multicellular organism such as plants and animals

it allows species to quickly adapt to environmental changes

it can be an advantage to organisms that live in a stable unchanging environment

Answers

Answer:

First Choice

it produces offspring with a large amount of genetic variation

Answer: i think this is correct.

Explanation: it occurs in simple organisms, such as bacteria, but not in multicellular organism such as plants and animals

Calculate the amount, in mol, of sodium atoms represented by 1.0x10(to the power of 20) sodium atoms

Answers

Explanation:

moles= number of particle or atom / 6.02×10^23

so

[tex] \frac{1.1 \times {10}^{20 } }{6.02 \times {10}^{23} } [/tex]

gives u 1.83×10^-4 moles

hope it make sense :)

Answer:

1.7 * 10^-4 moles

Explanation:

According to Avogadro, one mole of a substance contains 6.02 * 10^23 number of atoms, molecules, ions etc.

Hence;

1 mole of Na contains 6.02 * 10^23 atoms

x moles of Na contains  1.0x10^20 atoms

x = 1.0x10^20 * 1/6.02 * 10^23

x = 1.7 * 10^-4 moles

A container of oxygen gas is at STP. If this sample is put into an oven at 280 C, what would its pressure be, in atmospheres?

Answers

Explanation:

Step 1:

Data obtained from the question. This include the following:

Initial pressure (P1) = 1atm

Initial temperature (T1) = 0°C = 0°C + 273 = 273K

Final temperature (T2) = 280°C = 280°C + 273 = 553K

Final pressure (P2) =...?

Step 2:

Determination of the new pressure of the gas.

Since the volume of the gas is constant, the following equation:

P1/T1 = P2/T2

will be used to obtain the pressure. This is illustrated below:

P1/T1 = P2/T2

1/273 = P2 / 553

Cross multiply

273x P2 = 553

Divide both side by 273

P2 = 553/273

P2 = 2.03atm

Therefore, the new pressure of the gas will be 2.03atm

Answer:

[tex]\boxed {\boxed {\sf P_2=2.03 \ atm}}[/tex]

Explanation:

We are concerned with the variables of temperature and pressure, so we use Gay-Lussac's Law, which states the temperature of a gas is directly proportional to the pressure. The formula is:

[tex]\frac{P_1}{T_1}=\frac{P_2}{T_2}[/tex]

We know that the container of gas begins at standard temperature and pressure (STP). This is 1 atmosphere of pressure and 273 Kelvin.

[tex]\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{T_2}[/tex]

We know the gas is put into an oven at 280 degrees Celsius. We can convert this to Kelvin.

K= °C + 273.15 K= 280 +273.15K= 553.15

[tex]\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{553.15 \ K}[/tex]

We are solving for the new pressure, so we must isolate the variable P₂. It is being divided by 553.15 Kelvin. The inverse of division is multiplication, so we multiply both sides by 553.15 K

[tex]553.15 \ K *\frac { 1 \ atm}{ 273 \ K} = \frac{P_2}{553.15 \ K} * 553.15 \ K[/tex]

[tex]553.15 \ K *\frac { 1 \ atm}{ 273 \ K}= P_2[/tex]

The units of Kelvin cancel.

[tex]553.15 *\frac { 1 \ atm}{ 273 }= P_2[/tex]

[tex]2.02619047619 \ atm = P_2[/tex]

Rounded to the nearest hundredth:

[tex]2.03 \ atm \approx P_2[/tex]

The new pressure is approximately 2.03 atmospheres.

HELP PLEASE I DONT KNOW WHAT THIS MEANS IM CONFUSED

Answers

Explanation:

In an alpha emission, an alpha particle is ejected from a large nucleus. An alpha particle is simply a helium nucleus (atomic number is 2 and mass number is 4) so that means that the atomic number of the emitting nucleus decreases by 2 and its mass number decreases by 4.

Please help me on this question

Answers

Acids react with metals to form hydrogen gas.

a gas with a volume of 20.0l at a pressure of 275 kpa is allowed to expand to a volume of 35.0l. what is the pressure in the container if the temperature remains constant?

1. 2.54 kPa

2. 157 kPa

3. 481 kPa

pls help ;(

Answers

Answer:

[tex]\boxed {\boxed {\sf 2. \ 157 \ kPa}}[/tex]

Explanation:

Since temperature remains constant, the only variables that change are volume and pressure. Therefore, we are using Boyle's Law. This states that the pressure is inversely proportional to the volume. The formula is:

[tex]P_1V_1=P_2V_2[/tex]

We know the gas starts with a volume of 20.0 liters at a pressure of 275 kPa. We can substitute these values into the left side of the formula.

[tex]275 \ kPa *20.0 \ L=P_2V_2[/tex]

We know the gas expands to a volume of 35.0 Liters, but we do not know the pressure.

[tex]275 \ kPa *20.0 \ L=P_2* 35.0 \ L[/tex]

Since we are solving for the new pressure, we must isolate the variable P₂. It is being multiplied by 35.0 Liters and the inverse of multiplication is division. Divide both sides by 35.0 L.

[tex]\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}= \frac{P_2*35.0 \ L}{35.0 \ L}[/tex]

[tex]\frac {275 \ kPa * 20.0 \ L}{ 35.0 \ L}=P_2[/tex]

The units of liters cancel.

[tex]\frac {275 \ kPa * 20.0 }{ 35.0 }=P_2[/tex]

[tex]\frac {5500}{35.0} \ kPa= P_2[/tex]

[tex]157.142857 \ kPa=P_2[/tex]

The original measurements of pressure and volume have 3 significant figures, so our answer must have the same. For the number we calculated, that is the ones place.

The 1 in the tenths place (157.142857) tells us to leave the 7 in the ones place.

[tex]157 \ kPa= P_2[/tex]

If the gas expanded to a volume of 35.0 liters while the temperature remained constant, the pressure in container was approximately 157 kilopascals.

Which emission causes the atomic number of a nuclide to decrease by 2 and its mass number to
decrease by 4?
1.
an alpha particle
2.
a beta particle
3.
gamma radiation
4.
a positron

Answers

An alpha particle emission causes the atomic number of a nuclide to decrease by 2 and its mass number to decrease by 4.

What is nuclear emission?

Nuclear Emission explains the release of energy stored in the nucleus of an atom in the form of particles like alpha particles, beta particles, gamma ray etc.

When a nucleus emits an alpha particle, it loses 2 protons and 2 neutrons, so its atomic number decreases by 2 and its mass number decreases by 4.

Hence, option 1 is correct.

Learn more about alpha particles here:

https://brainly.com/question/487383?referrer=searchResults

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4.
The relationship between how much mass matter has in a given volume is called
A. density
O
B. boiling point
C. melting point
O
D. weight

Answers

[tex]\huge{ \mathrm{  \underline{ Answer }\:  \:  ✓ }}[/tex]

The relationship between mass of matter per unit volume is known as :

[tex] \large \boxed{ \mathrm{density}}[/tex]

_____________________________

[tex]\mathrm{ ☠ \: TeeNForeveR \:☠ }[/tex]

please mark all that apply!

Answers

Answer:

F G there you go the guy on top is right

Explanation:

F G

17. A scientist determines an unknown metallic sample to have 77 protons and 77 electrons with a mass number of 192. How many neutrons does one
metal atom contain?

Answers

Answer:

Ok so hot u hahaha

Explanation:

Hshshhdhdi jsushshshshshhdhdhd hshshshshsh hdhdhdhd hdhdhdhd hdhdh

Tritium (hydrogen-3) has a half-life of 12.3 years. How old is a bottle of wine if the tritium content is determined to be 25% in new bottle of wine

Answers

Answer:

24.6 years

Explanation:

Applying,

A = (A')[tex]2^{a/n}[/tex]..................... Equation 1

Where A = Original Tritium content in the wine, A' = Tritium content in the wine after decay, a = age of the old bottle, n = half life of Tritium

From the question,

Let A = X, therefore, A' = 0.25X

Given: n = 12.3 years

Substitute these values into equation 1

X = 0.25X([tex]2^{a/n}[/tex])

1 = 0.25×([tex]2^{a/12.3}[/tex])

1/0.25 =

4 = [tex]2^{a/12.3}[/tex]

[tex]2^{a/12.3}[/tex] = 2²

Equation the base,

a/12.3 = 2

a = 12.3×2

a = 24.6 years

ANSWER THIS QUESTION FOR 29 POINTS
List several examples of what cells do all day?

I NEED HELP HELP ASAP

Answers

Answer:

Explanation:

cells process rna and trna

converting food into energy

the regrowth of cells that have died through out the day

the transcription of dna to rna

hope this helped :)

Study the particle below carefully and answer
the questions that followed.
a)ldentify the particle.
b)Write the electronic configuration of the
particle.
c)State
i.Atomic number
ii.Mass number
iii.Proton number
iv.Electron number
d) Calculate the neutron number
e) State the valency
f)What is the valence electrons?

Answers

Answer:

b is the answer hope that helps

The theory of plate tectonics is supported by data collected by scientists. One piece of data includes that earthquakes tend to occur*
a.along plate boundaries
b.along mountain ranges
c.along the banks of rivers
d.along the boundaries of glaciers

Answers

Answer:

is that a letter a

Explanation:

that is my answer

What are three advantages of renewable energy?

Answers

1. Renewable energy won’t run out.

2. Maintenance requirements are lower.

3. Renewables save money.

What is a zirconium, in your own words but be more detailed.What is a zirconium, in your own words but be more detailed.

Answers

Answer:

Zirconium is a silver-gray transition metal, a type of element that is malleable and ductile and easily forms stable compounds. It is also highly resistant to corrosion. It is commonly used in corrosive environments. Zirconium alloys can be found in pipes, fittings, and heat exchangers, according to Chemicool.

Explanation:

Answer: Today this element is widely used, as zircon, as Zirconium oxide and as the metal itself. Zirconium is to be found in ceramics, foundry equipment, glass, chemicals, and metal alloys. Zircon sand is used for heat-resistant linings for furnaces, for giant ladles for molten metal, and to make foundry moulds.

Explanation: Hope it help I think


How many representative particles are there in 10.43g of sugar (C12H22011)?

Answers

Answer:

10.43 / 342 × 6.02 × 10 ^23 = 18.34 × 10^ 21

The Himalayan mountain range of India was formed at a ____.
A) convergent boundary
B) divergent boundary
C) hot spot
D) transform boundary

Answers

Answer:

its answer is b

Explanation:

divergent boundary

It is b) divergent boundary

Write a quick summary about what we learned about Radioactive Decay. Be sure to include: 1). Structrue of an atom's nucleus 2). Three Types of radioactive decay and what happens with them.

Answers

Answer:

Radioactive decay refers to the release of radiation from the nuclei.

Explanation:

Radioactive decay also known as nuclear decay is a type of process in which an unstable atomic nucleus loses energy by radiation. Alpha decay, beta decay, and gamma decay are the three of the most common types of decay, which emitting one or more particles or photons from the unstable nuclei of radioactive atom. Beta decay occurs due to weak force, while the alpha and gamma decay happens due to electromagnetic and strong forces.

Which of the following phase changes describes what is
happening in the following endothermic process?
H20 (1) + heat --> H2O (g)
O melting
o freezing
o boiling
O condensing

Answers

Answer:

I think the answer is boiling

Which weighs more, a ton of bricks or
a ton of feathers? Which has more pieces in it?
Explain How you know.

Answers

Both weigh in the same but the feathers has more pieces in it

Answer:

They equal the same

Explanation:

Because A ton of feathers and A ton of bricks. They both equal A ton.

Write a chemical equation for the following reaction. (Type your answer using format CH4 for CH4.) In water, iron(III) chloride reacts with sodium hydroxide, producing solid iron(III) hydroxide and sodium chloride.

Answers

Answer:

FeCl3(aq) -

3NaOH(aq) 0 Fe(OH)3(s) -

3NaCl(aq)

Explanation:

FeCl3(aq) -

3NaOH(aq) 0 Fe(OH)3(s) -

3NaCl(aq)

ΔU for a van der Waals gas increases by 475 J in an expansion process, and the magnitude of w is 93.0 J.

Answers

Complete question:

ΔU for a van der Waals gas increases by 475 J in an expansion process, and the magnitude of w is 93.0 J. calculate the magnitude of q for the process.

Answer:

The magnitude of q for the process 568 J.

Explanation:

Given;

change in internal energy of the gas, ΔU = 475 J

work done by the gas, w = 93 J

heat added to the system, = q

During gas expansion process, heat is added to the gas.

Apply the first law of thermodynamic to determine the magnitude of heat added to the gas.

ΔU = q - w

q = ΔU +  w

q = 475 J  +  93 J

q = 568 J

Therefore, the magnitude of q for the process 568 J.

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