The pH range of phenolphthalein is 8.3 - 10.0, which is suitable with the pH range of Strong Acid and Strong base titration and so phenolphthalein is used as a visual indicator in a strong acid-strong base titration.
What is an Indicator ?Any substance that gives a clear visible indication of the presence or absence of a particular concentration of a chemical species, such as an acid or an alkali in a solution, usually by a colour change.
The pH range of Strong Acid and Strong base titration is 3–11 and equivalent point is at 7
the pH range of Strong Acid and Weak base titration, is 3–8 and equivalent point is below 7
the pH range of Weak Acid and Strong base titration, is 6 - 11 and equivalent point is above 7
So for titration , an indicator with suitable pH range is used
The pH range of phenolphthalein is 8.3 - 10.0.
Therefore phenolphthalein is used as a visual indicator in a strong acid-strong base titration.
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A dump truck, a sports car, and a bicycle are traveling at the same velocity. Which is true?
A The bicycle has the least kinetic energy.
B More information is needed to compare their kinetic energy.
C They all have the same kinetic energy.
D The sports car has the most kinetic energy.
Answer:
a
Explanation:
The object with greater mass is having greater kinetic energy. Here, all the objects has the same velocity therefore, the bicycle is having least kinetic energy.
What is kinetic energy?Kinetic energy is a form of energy generated by virtue of the motion of the object. The kinetic energy is related to the mass and velocity of the body by the expression below:
KE = 1/2 mv².
As per this equation, kinetic energy increases with an increase in mass or/ and velocity. The substance with greater mass is possessing the greater kinetic energy.
A dump truck has greater mass than a car and bicycle. Thus, at the same velocity for all, the greater kinetic energy is for the truck and the least kinetic energy is for the bicycle having the least mass here. Thus, option A is true.
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before making a covalent bond, where do the atom's electrons spend most of their time?
Answer:
Before bonding, the atom's electrons spend most of their time around the nuclei of each atom. Once bonded, the electrons spend most of their time between the two nuclei
carbon dioxide + Calcium Carbonate =?
Answer:
calcium carbonate deteriorates, delivering carbon dioxide gas and leaving behind calcium oxide a white solid. Over the long haul, this responds with carbon dioxide noticeable all around to frame gems of calcium carbonate, which lock the sand grains together to shape a hard rock-like material
Explanation:
Answer:
calium bicarbonate
Explanation:
Can someone please tell me the answer on this. First person to answer will most definitely be marked brainliest so please just tell me the answer. The deadline is in 5 MINUTES!!
particles, high, low, oxygen, waste, carbondioxide, fast.
The opposite of an endothermic reaction is a(n) reaction.
Answer:
The opposite of an endothermic process is an exothermic process, one that releases or "gives out" energy, usually in the form of heat and sometimes as electrical energy.
Explanation:
Hope this helps you. Have a nice day. Please mark as brainliest. It helps a lot. ^_^
a liquid can be described as a form of matter that
Answer:
That has no fixed shape but it have fixed volume.
All matter is made up of atoms and molecules that are what?
Are two atoms of same element identical
Answer:
No. Two atoms of the same chemical element are typically not identical. Since the states of the electrons in an atom are what determine the nature of the chemical bonding that the atom experiences, two atoms of the same element can react differently if they are in different states.
Answer: No
Explanation: Two atoms of the same chemical element are typically not identical. First of all, there is a range of possible states that the electrons of an atom can occupy. Two atoms of the same element can be different if their electrons are in different states.
What is photosynthesis?
Answer:
when the sun's light hits a living thing
Please help!! Need asap due at 11:59
There are more than 118 naturally occurring elements.Seventy five percent of the universe is Carbon .The earths's crust and human body are made of different elements.But Carbon is an element which is abundant in both.Most objects are made of Carbon with approximately one million Compounds known and over being developed and discovered every year.
Copper has two naturally occurring isotopes: Cu-63 with mass 62.9395 amu and a natural abundance of 69.17% and Cu-65 with mass 64.9278 amu and a natural abundance of 30.83%. Calculate the atomic mass of copper.
Answer
63.55
Explanation:
63
C
u
has
69.2
%
abundance.
65
C
u
has
30.8
%
abundance.
So, the weighted average is
62.93
×
69.2
%
+
64.93
×
30.8
%
Pls helpppp me if you cannn
Answer:
Solution A : calcium hydroxide
Solid B : calcium oxide
Gas C : Hydrogen gas
Explanation:
i) When metals react with water they form hydroxides thus calcium hydroxide
ii) When metals eact with oxygen they form oxides.
iii) Wehn metals react with hydrochloric acid they form a salt and a gas hydrogen.
HOPE THIS HELPED
Which of the following is an intensive physical property?
(A) color
B) volume
C)
length
D)
mass
Color is an example of an intensive physical property. Details about intensive physical property can be found below.
What is intensive property?Intensive properties are physical properties that does not depend on the mass of the substance or system.
Another property of substances is the extensive property, which is the property that is dependent on the quantity of the substance.
Examples of intensive physical properties are as follows:
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In San Diego (elevation 15 feet), you
step on a scale and weigh 115
pounds, using the same scale in
Denver, Colorado (elevation 5,280
feet) you would weigh
A. more than in San Diego
B. less than in San Diego
C. the same as in San Diego
Answer: b
Explanation:
It will weigh less than in San Diego. So, the correct option is (B).
What is Elevation?The elevation of a geographic location is defined as its height above or below a fixed reference point known as a geoid which is a mathematical model of the Earth's sea level as an equipotential gravitational surface.
Height is defined as the vertical distance of a point on a horizontal surface while Elevation is the height of a point above (or below) sea level.
As the Elevation is higher, the weight will be less, whereas if the Elevation is less, then the weight will be more. For example, the elevation in San Diego is 15 feet, so the weight is 115 pounds, while the elevation in Denver, Colorado, is 5,280 feet, so the weight would be less than 115 pounds.
Thus, it will weigh less than in San Diego. So, the correct option is (B).
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a caterpillar travels across the length of a 3.00 m porch in 10.5 minutes. what is the average velocity of the caterpillar in m/s?
Answer:
3.5 meters per second
Explanation:
10.5 divided by 3 equals 3.5
a sample of gold has a mass of 96.5 g and a volume of 5.00 cm3. the density of gold is
Answer:
19.3 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 96.5 g
volume = 5 cm³
We have
[tex]density = \frac{96.5}{5} \\ = 19.3[/tex]
We have the final answer as
19.3 g/cm³Hope this helps you
how many grams are contained in 3.4 moles of potassium
Answer:
The answer is 0.025576559594663
household substances that contains acid
Answer:
milk, lemon juice, toothpaste and baking soda
PPPPPPLLLLLLSSSSS HELP IT DUE IN TWENTY MINUTES WILL GIVE THIRTY POINTS
4. Evaluate: Look at the results of your experiment. What was the relationship between crumple zone rigidity, crumple zone deformation, and maximum force on the dummy?
Answer:
Explanation:
Start by restating the question.
So how is the crumple zone rigidity, crumple zone deformation , and the maximum force of the dummy similar, and how are they different?
The crumple zone increases, the crumple zone deformation increases then decreases then repeated in increasing and decreasing , and the maximum force decreases. Hope that helps!
546.8910 - 32.9 = ? Remember to use the appropriate significant figures.
513.991
Explanation:
546.8910
- 32.9
-----------
513.991
-----------
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The molar mass of sulfur S is 32.06 g/mol
Calculate the mass in grams of a sample of S containing 2.01x10^24 atoms
Help Please<3
Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:
mass = moles × molar mass moles = atoms ÷ Avogadro's Number
⇒ mass = (atoms ÷ Avogadro's Number) × molar mass
mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)
= 107.01 g
the mass of a sample of S containing 2.01×10²⁴ atoms is 107.01 g.The molar mass of sulfur S is 32.06 g/mol, then the mass in grams of a sample of S containing 2.01x10^24 atoms is 107.01 g
what is molar mass ?The molar mass can be defined as the weight of one sample mole, by Multiplying the subscript means the number of atoms times that element’s atomic mass and add the masses of all the elements in the molecule to obtain the molecular mass.
Molar mass is expressed in either gram ( g) or kilograms (kg).
Mass = moles × molar mass
moles = atoms ÷ Avogadro's Number
⇒ mass = (atoms ÷ Avogadro's Number) × molar mass
mass = [(2.01 × 10²⁴ atoms) ÷ (6.022 × 10²³ atoms/mole)] × (32.06 g/mol)
= 107.01 g
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20
. If the number of neutrons in the nucleus of the atom is 30, and the atomic number is 40, what is the mass number of that atom?
Answer:
70
Explanation:
The atomic number stands for the number of protons.
mass number stands for number of neutrons and protons.
30 neutrons + 40 protons = mass number of 70
Hope this helps!
. Which situation will result in lower average kinetic energy? a) 100 people go swimming into a NYC public pool b) 100 people go swimming at Coney Island beach
Answer:
I think it would be the beach because all the waves and such but in a pool with more people there is a tight space so they cant move around as much and as freely. But this could be a trickster question but I would choose the beach.
Hope this is right :)
The colour observed hrainbow during on the lower side of a a sunny rainy day is
Answer:
..
Explanation:
When you use a simple machine to do work, ________.
A
distance increases and force decreases
B
distance and force both increase
C
distance and force both decrease
D
distance decreases and force increases
Answer:
distance decreases and force increases
Explanation:
Simple machine means less power Hence it will require more force.Hence distance will decrease with respect to force and force will decreaseWhen we use a simple machine to do work, the distance decreases, the force increases. Hence, option D is correct. Because, these parameters are in inverse proportion.
What is force?Force is an external agent acting on a body to change its motion. There are various kinds of force such as frictional force, magnetic force, gravitational force etc.
Work done is the effectiveness of the machine to use the force to make the maximum displacement. Work done is the product of force and distance.
W = F.ds
As per this relation, the force acting on large distance makes greater work done. However,
F = W/ds.
Hence, as the distance increases, the force is decreasing. Therefore, option D is correct.
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Which of the three objects has the greatest density? Why? (GOLD BARS/GOLD COINS/GOLD CHAIN)
Answer:
They all have the same density
Explanation:
Density is an intensive physical property, meaning that as long as the chemical formula is the same, that specific intensive physical property will be the same. For example. One kilogram of feathers has the same mass as one kilogram of bricks. Why? They both have a mass of one kilogram.
It's the same thing here. Since all the objects are (assumed to be) made up of 100% gold, they would all have the same density regardless of the mass. For extra points, say the density of each object is [tex]19 \frac{g}{cm^3}[/tex].
Answerthey all have the same density Explanation:
convert 230.000 000 000 mi into scientific notation
Answer:2.3×10^11
Explanation:since scientific notation is as a×10^k with 0<a<=9
All alkalis are bases but not all bases are alkalis. True or False?
Answer:
A substance that neutralizes an acid is generally called a base and the basic substances that are soluble in water and alkali and the properties of alkalis are due to these hydroxide ions(OH−). ... - Thus, conclusively it can be said that all alkalis are bases but all bases are not alkali.
Answer:
This is false
Explanation:
it is actually the opposite, all bases don't dissolve in water, but alkali is a base that does dissolve in water. So, alkalis are bases, but not all bases are alkalis
Pinky, message in one of my answers that doesn't have an comment on pls.. i wish i can tlk to u.. but this new system in brainly.. oof
what happens when potassium reacts with fluorine to produce potassium fluoride
Answer:
In order to obtain eight valence electrons (an octet), the potassium atom will transfer its single valence electron to the fluorine atom.
HELP PLZZZZZZZ ASAP
Which best describe the kinetic energy of the particles in solids, liquids, and gases? Check all that apply.
Particles in solids have low kinetic energy.
Particles in solids have high kinetic energy.
Particles in liquids have moderate kinetic energy.
Particles in liquids have low kinetic energy.
Particles in gases have high kinetic energy.
