Answer:
1. 0.25 moldm¯³.
2. 9.125 gdm¯³.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2HCl + Na2CO3 → 2NaCl + H2O + CO2
From the balanced equation,
The mole ratio of the acid, HCl (nA) = 2
The mole ratio of the base, Na2CO3 (nB) = 1
1. Determination of the concentration of the acid, HCl in moldm¯³.
Volume of acid, HCl (Va) = 20 cm³
Volume of base, Na2CO3 (Va) = 25 cm³
Concentration of base, Na2CO3 (Cb) = 0.1 moldm¯³
The mole ratio of the acid, HCl (nA) = 2
The mole ratio of the base, Na2CO3 (nB) = 1
Concentration of acid, HCl (Ca) =?
Cava /CbVb = nA/nB
Ca × 20 / 0.1 × 25 = 2/1
Ca × 20 / 2.5 = 2
Cross multiply
Ca × 20 = 2.5 × 2
Ca × 20 = 5
Divide both side by 20
Ca = 5/20
Ca = 0.25 moldm¯³
Thus, the concentration of the acid, HCl in moldm¯³ is 0.25 moldm¯³
2. Determination of the concentration of the acid, HCl in gdm¯³
Concentration of the acid, HCl = 0.25 moldm¯³
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Concentration of the acid, HCl in gdm¯³ =?
Conc. in moldm¯³ = Conc. in gdm¯³ /Molar mass
0.25 = Conc. in gdm¯³ /36.5
Cross multiply
Conc. in gdm¯³ = 0.25 × 36.5
Conc. in gdm¯³ = 9.125 gdm¯³.
What are some differences between a main sequence star and a red giant?
Answer:
Some notable differences between a main sequence star and a red giant are its sizes and color. Red Giants tend to typically be, well, red. The output of a red giant is so much greater than that of a main sequence. A red giant is the last stage of a main sequence star's life. Another difference is what occurs inside the star. Main sequence stars fuse hydrogen together in order to keep gravity from imploding the star, while red giants run short of hydrogen and fuses helium.
Diagram:
How many grams are equal to 0.11 mole of copper(I) chromate?
Mass of Copper(I) chromate( CuCrO₄) = 19.75 g
Further explanationThe mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass
[tex]\tt \large{\boxed{\bold{mol=\dfrac{m(mass)}{MW(molecular~weight)}}}[/tex]
0.11 mole of Copper(I) chromate( CuCrO₄) ⇒ MW=179.54 g/mol, so mass :
[tex]\tt mass=mol\times MW\\\\mass=0.11\times 179.54\\\\mass=19.75~g[/tex]
Potato strips placed in a container of concentrated salt water will ultimately __.
Answer:
00000
Explanation:
BRAINIEST IF ANSWERED which of the following is a molecule ( A.HCl B.HK C.MgCl2 D.Kl)
Answer: A.HCI
Explanation:
At 6 atmosphere pressure, the volume of a gas is 1200 ml. What pressure is
required to reduce the volume of a gas to 200 ml without changing the
temperature?
Answer:
36 atmExplanation:
The pressure required can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the required pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{6 \times 1200}{200} = \frac{7200}{200} = \frac{72}{2} \\ [/tex]
We have the final answer as
36 atmHope this helps you
In order to help visualize an atom,a scientist may do which of the following.
Complete Question:
In order to help visualize an atom, a scientist may do which of the following?
Group of answer choices
A. Form a hypothesis.
B. Make a model.
C. Create a law.
D. Develop a theory.
Answer:
B. Make a model.
Explanation:
An atom can be defined as the smallest unit of matter and it retains all the chemical properties associated with the element.
Basically, atoms are the building block of matters and essentially comprises of three (3) fundamental particles which are protons, neutrons and electrons which typically determines the charge and mass of an atom.
In order to help visualize an atom, a scientist may make a model. Due to the limitations of various human inventions in the field of science, it has become practically impossible to get an image or a picture of an atom even through the use of a microscope because of its minute nature and owing to the fact that it is much smaller than the wavelength of visible light.
However, some notable scientists have created or developed models that aids in the understanding and visualization of atoms. These atomic models are;
1. Quantum mechanics model of atom.
2. John Dalton's atomic model.
3. Neil Bohr's atomic model.
4. Rutherford's model of the atom.
5. Thomson's model of the atom.
6. Plum pudding atomic model.
Which describes a covalent bond?
a. Formed by the sharing of electrons between atoms
b. Formed by the giving and taking of electrons between atoms.
c. Formed by the forces of gravity between atoms.
d. Formed by sharing protons and neutrons between atoms
Answer:
a
Explanation:
covalent bonds are bonds between two nonmetals where they share an electron :)
how can you test a sample of soil for acidity or alkalinity
Answer:
Scoop a soil sample into a fresh container, add 1/2 cup of water, and mix. Then, add 1/2 cup of baking soda. If the soil bubbles or fizzes, the soil is acidic. The reaction you're seeing is the result of acidic soil coming into contact with an alkaline substance (baking soda).
Explanation:
Hope this helped!
how many total atoms are in 3(SO)4
Answer:
17 atoms are in 3(SO)4
Explanation:
Which of these properties can be used to separate mixtures? - characteristic properties *
1. state of matter
2. mass
3. volume
4. boiling/melting point
5. density
6. conductivity
7. solubility
Answer:
Boiling/melting point
Explanation:
Some elements can’t handle the heat nor the cold, so they separate like oil & water.
Dalton thought that the atoms of each element were the same. We
now know that elements can have different atoms, for example,
chlorine has two different atoms, 35Cl and 7 C.
What name is given to different types of atom of the same element?
Answer:
molecule
Explanation:
A molecule is formed from two or more atoms
what is the name of the compound represented by the formula SI2BR6
Answer:
Disilicon Hexabromide
Explanation:
A compound H2O is named – Dihydrogen monoxide. Its common name is of course water. A compound of Si2Br6 is named – Disilicon Hexabromide. 2.
What do you know about a substance it you know its temperature? A.How heavy the substance is B.How large or small the particles of the substance are C.How many particles are in the substance D.How hot or cold the substance is
Answer:
C. how many particles are in the substance
Answer:
it is how hot or cold so bassically c in my test
Explanation:
7. Calculate the average atomic mass of bromine. One isotope of bromine has an atomic mass of 78.92amu and a relative abundance of 50.69%. The other major isotope of bromine has an atomic mass of 80.92amu and a relative abundance of 49.31%.
Answer:
Average atomic mass = 79.9 amu.
Explanation:
Given data:
Average atomic mass of Bromine = ?
Atomic mass of 1st isotope = 78.92 amu
Relative abundance of 1st isotope = 50.69%
Atomic mass of 2nd isotope = 80.92 amu
Relative abundance of 1st isotope = 49.31%
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (50.69×78.92)+(80.92×49.31) /100
Average atomic mass = 4000.45 + 3990.16 / 100
Average atomic mass = 7990.61 / 100
Average atomic mass = 79.9 amu.
Which option is a compound? A. Oxygen B. Carbon dioxide C. Carbon D. Air
Answer:
b cause it's a mixture of two elements
The substances that are chemically bound together
are
Answer:
Select one of the readings in this unit and in at least one hundred words, discuss how immediacy, foreshadowing, and commentary work to show author's purpose, meaning, or tone and style.
Explanation:
Select one of the readings in this unit and in at least one hundred words, discuss how immediacy, foreshadowing, and commentary work to show author's purpose, meaning, or tone and style.
Substances that are chemically bond together are called compounds.
A substances may or may not consist of components that are chemically combined together.
Substances that are composed of components that are chemically combined together are called compounds. If the components are not chemically combined, the substance is called a mixture.
Examples of chemical compounds include; CH3COOH, CaCO3 etc
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How much heat must be transferred to 55 g of ice to change the ice's temperature from -13°C to -5.0°C? (The specific heat capacity of ice is 2.11 J/g•°C.)
Answer:
Hey i don't know if you still need the answer but this is what i think it is:
Explanation:
B is correct answer
15 j
(Sorry if its wrong)
What is the wavelength of a light of frequency 4.47 x 1014 Hz?
Answer:
The correct answer is 671nm because if you multiply 4.47 times 1014 Hz the answer would be 671nm.
Explanation:
Answer:
A. 671 nm
Explanation:
A P E X
HELP ME PLEASEEE -------------------------------- BRAINLY !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
help with what tho-
Explanation:
In 25 words or fewer, what do you think a scientist would want to explain about this soda?
Answer:
This soda is brown, sweet, has high carbonation, and is about 200 calories when consumed.
Explanation:
:)
A bus travels a distance 150km
in 5 hours where as another bus travel 200km in
6 hours which bus travel fast
Answer: The bus traveling 200km in 6 hours is traveling the fastest.
Explanation:
Bus 1
150km/5hrs
Simplify -> 30km/hr
Bus 2
200km/6hrs
Simplify -> About 33.333km/hr
At 303 K, the volume of a gas is 30.0 ml. At constant pressure, what is the new
volume of the gas if the temperature is decreased to 283K?
Answer:
V₂ = 28 mL
Explanation:
Given data:
Initial temperature = 303 K
Initial volume = 30.0 mL
Final temperature = 283 K
Final volume = ?
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 30.0 mL × 283 K /303 K
V₂ = 8490 mL.K / 303 K
V₂ = 28 mL
PLEASE HELP!
Newton’s first law of motion was a giant leap forward in scientific thought during Newton’s time. Even today, the idea is sometimes difficult at first for people to understand.
Which statement is the best example of an object and motion that would make it hard for people to accept Newton’s first law?
A rolling ball eventually slows down and comes to a stop.
A wagon must be pushed before it begins to move.
The heavier the load in a cart, the harder the cart is to turn.
A box does not move when pushed equally from opposite sides.
Answer:
A rolling ball eventually slows down and comes to a stop
How many moles of aluminum are in 1.204 x 1023 atoms of aluminum?
A. 0.2 moles
B. 2.0 moles
C. 1.0 mole
O D. 5.0 moles
15 points if you answer fast
Answer:
0.2 moles
Explanation:
The number of moles of aluminum for 1.204 x 0²³ atoms of aluminum is 0.2 moles. Hence, The correct answer is Option (A)
What is the mole concept ?
Mole is defined as the amount of the substance containing the same number of discrete entities (atoms, molecules, ions, etc) as there are atoms in a sample of pure 12C weighing exactly 12g.
The number of particles present in one mole of any substance = Avogadro Number = 6.023 x 10²³.
Formula to calculate Mole when number of particles is given ;
n = given number / 6.023 x 10²³
n = 1.204 x 10²³ / 6.023 x 10²³
n = 0.2 moles
Therefore, The number of moles of aluminum for 1.204 x 0²³ atoms of aluminum is 0.2 moles. Hence, The correct answer is Option (A)
Learn more about Mole concept here ;
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Which best explains why a black T-shirt gets warmer in the Sun than a white T-shirt?
A)Darker colors reflect more energy from colliding particles than lighter colors do.
B)Darker colors absorb more energy from colliding particles than lighter colors do.
C)Darker colors reflect more energy from electromagnetic waves than lighter colors do.
D)Darker colors absorb more energy from electromagnetic waves than lighter colors do.
Answer:
D dark colors absorb the sun more cause the wants to make everything bright I hope I helped :)
The statement " Darker colors absorb more energy from electromagnetic waves than lighter colors do." is correct.
What is electromagnetic waves?When an electric field collides with a magnetic field, electromagnetic waves are created. As a result, they're called electromagnetic waves.
What is light?
Light, often known as visible light, is electromagnetic radiation that falls within the region of electromagnetic wave or spectrum that the human eye can perceive.
White is a mixture of all seven colors found in the white light spectrum, including Violet, Indigo, Blue, Green, Yellow, Orange, and Red. This visible spectrum has a wavelength of 400 to 700 nanometers. When an object appears to be a particular color, such as red, it signifies that it is projecting the wavelength of red light (620 to 750 nanometers) while absorbing all other wavelengths. Furthermore, because light is a kind of energy, the more light a thing consumes, the more heat it consumes.
To know more electromagnetic wave and light.
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Would CdF2 conduct electricity if dissolved in water?
When a metal conducts electricity, the charge is carried by electrons moving through the metal.
Match each type of rock with the way it is formed
Answer:
Uh do you have a picture that can help us answer this question...
Explanation:
9. A box is pushed 1.5 m to the right in 5 s. What is the box’s average speed to the nearest hundredth of a m/s? *
Answer:
s = 0.30 m/s
Explanation:
Given data:
Distance travel = 1.5 m
Time taken = 5 s
Average speed of box = ?
Solution:
s = d/t
s = speed
d = distance
t = time
by putting values,
s = 1.5 m/ 5 s
s = 0.30 m/s
What mass of propane (C3H8) must be burned in a barbecue grill to release 4560 kJ of heat?
Answer:
The answer is "[tex]\bold{90.62 \ g \ C_3H_8}[/tex]".
Explanation:
Write a balanced thermochemical formula for both the combustion with one mole of [tex]C_3H_8[/tex]
[tex]C_3H_8\ (g) +5 O_2 \ (g)\longrightarrow 3 CO_2 \ (g) +4H_2O \ (l)\ \ \ \ \ \ \ \ \Delta H_{comb} = -2219 \frac{kj}{mol}[/tex]
Calculating the molar mass of [tex]C_3H_8[/tex] .
[tex]3 (12.0107 \frac{g}{mol}) +8 (1.0079 \frac{g}{mol})= 44.0953 \frac{g}{mol}[/tex]
1) Start with both the energy released.
2) Just use molar enthalpy of [tex]C_3H_8[/tex] as just a balanced equation to transfer kilojoules to birthmarks of [tex]C_3H_8[/tex] .
3) It use molarity of [tex]C_3H_8[/tex] as a balanced equation to transfer caterpillars of [tex]C_3H_8[/tex] to ounces of [tex]C_3H_8[/tex] .
[tex]= -4560 \ kJ \ \ \ \ \frac{1 \ mol C_3H_8}{-2219 \ kJ} \ \ \ \ \frac{44.0953 \ g \ C_3H_8}{1 \ mol \ C_3H_8}\\\\ = 90.62 \ g \ C_3H_8[/tex]
How is the process of photosynthesis essential to sustaining life on Earth?
Answer:
Explanation:
Photosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere. Without photosynthesis, the carbon cycle could not occur, oxygen-requiring life would not survive and plants would die. ... The importance of photosynthesis in our life is the oxygen it produces