Answer:
0.38
Explanation:
Molar mass of thiophene= 84g/mol
Mass of thiophene = 37g
Number of moles= 37/84= 0.44 moles
Molar mass of heptane= 100 g/mol
Mass of heptane = 72g
Number of moles = 72/100= 0.72 moles
Total number of moles= 0.44 + 0.72= 1.16 moles
mole fraction of thiophene = 0.44/1.16= 0.38
Consider this reaction: HCO3− + H2S → H2CO3 + HS−
Which is the conjugate acid?
H2S
HCO3-
HS–
H2CO3
The conjugate acid : H₂CO₃
Further explanationGiven
Reaction
HCO₃− + H₂S → H₂CO₃ + HS−
Required
The conjugate acid
Solution
Bronsted-Lowry
Acid ⇒ H⁺ + conjugate base
Bases + H⁺⇒ conjugate acids
Acid and conjugate base : H₂S and HS−
Base and conjugate acid : HCO₃− and H₂CO₃
H₂S gives (H⁺), then the remaining acid is a conjugate base HS−
HCO₃− receives (H +), then the conjugate acid H₂CO₃
Answer:
The correct answer is D.
Explanation:
Edge'21
When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?
a chemical change, because a precipitate is being formed
a chemical change, because a gas is being formed
a non chemical change, because a precipitate is being formed
a non-chemical change, because a gas is being formed
Answer: B
a chemical change, because a gas is being formed
Explanation:
Answer:
B
Mark Brainliest please
Explanation:
2 Ag20 →4 Ag + O2 what reaction is this
Answer:
Decomposition
Explanation:
hope it helps you
PLEASE HELP FREE BRAINLIEST DUE AT 1:40 PM EST
A block with a volume of 20 cm3 has a density of 5 g/cm3. The block is cut into two pieces. One piece has a volume of 15 cm3, and the other piece has a volume of 5 cm3. What are the densities of the two pieces?
Answer:
wouldnt they still have the same density?
Explanation:
for example, the density of iron is 7.874 g/cm^3 no matter how big the piece is. I hope this helps.
Question 4
Being Left Handed is a recessive trait so it would be represented by two lowercase letters like (hh)
Your answer:
O
True
False
Answer:
True
Explanation:
Which reaction is the opposite of a decomposition reaction?
Question 3 options:
Electrolysis of Water
Synthesis
Combustion
Explosion
Answer:
B) Synthesis reaction
Explanation:
synthesis reactions because they take apart larger molecules or compounds
Hope that helps
1pt Copper chloride and aluminum react to produce
aluminum chloride and copper. Which of the
following is the correctly balanced chemical
equation for this reaction?
O A. CuCl, + Al -> AICI, + u
O B. 3CuCl, + Al -> AlCl, + 2Cu
OC. 3CUCI, + 2Al -> 2AICI, + 3Cu
OD. CuCl, + 3Al -> AICI, + 2Cu
Answer:
None of the above
but it must be:
for Copper(I)chloride
3CuCl + Al ==> AlCl3 + 3Cu
for Copper (II) chloride
3CuCl2 + 2Al ==> 2AlCl3 + 3Cu
Which organisms are producers? (SELECT ALL THAT APPLY.)
grass
bear
human
oak tree
fungus
Answer:
Grass
Oak tree
Explanation:
Bear and human are definitely not and fungus are decomposers.
What is the name of the compound whose formula is Re2O
Answer:
im not myself with nitro gone
Explanation:
The compound ammonium phosphate is a strong electrolyte. Write the transformation that occurs when solid ammonium phosphate dissolves in water.
Answer:
(NH₄)₂SO₄(s) ---> 2NH₄⁺(aq) + SO₄⁻²(aq)
Explanation:
The compound ammonium phosphate is a strong electrolyte. - This means that ammonium phosphate fully ionizes - dissociates to positive and negative ions completely.
The ions formed when ammonium phosphate dissociates are; Ammonium ion NH₄⁺ and sulphate ion SO₄⁻²
The transformation is given in the equation;
(NH₄)₂SO₄ ---> NH₄⁺ + SO₄⁻²
Upon balancing;
(NH₄)₂SO₄(s) ---> 2NH₄⁺(aq) + SO₄⁻²(aq)
9. Which of these is not a mixture? *
Solution
Alloy
Amalgam
They are all mixtures.
Answer:
They are all mixture
Explanation:
last option
Which chemical equation is balanced?
a. 2LiOH + CO2 → Li2CO3 + H2O
b. LiOH + CO2 → Li2CO3 + H2O
c. LiOH + 3CO2 → 2Li2CO3 + H2O
d. 4LiOH + CO2 → Li2CO3 + 2H20
The balance chemical equation is 2LiOH + CO2 → Li2CO3 + H2O. Therefore, option A is correct.
What is balance chemical equation ?A chemical equation is said to be balanced if the quantity of each type of atom in the reaction is the same on both the reactant and product sides. In a balanced chemical equation, the mass and the change are both equal.
The law of conservation of mass states that when a chemical reaction takes place, the mass of the reactants and products should be equal. As a result, during the chemical process, the number of atoms in each element remains constant. The chemical equation must be balanced as a result.
The chemical equation is said to be balanced if there are no inequalities. Every element in this illustration now has the same amount of atoms on the reactant and product sides.
Thus, option A is correct.
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Can someone put these together????
Answer:
ans is 1 to 4 , 2 to 2, 3to 5, 4to 1, 5to 3
this is ans
which of the following statements are part of the kinetic molecular theory ?
Answer: The average kinetic energy is proportional to the absolute temperature of the gas. Gas particles are in random motion. Gas particles have no volume. And the collisions between gas particles are elastic.
Explanation: I heard this question before, I think. Hope this helps!
What is the number of electrons in an atom that has 26 protons and 30 neutrons?
Answer:
26
Explanation:
The number of electrons and protons are equal.
Will give brainliest
the presidential inauguration is free to watch with or without paying ror traditional tv service. Why is this important?
Answer:
so that people would be able to witness the inauguration of a president, since a president is an important part of a country.
Explanation:
How many representative particles are in 11.5 moles Ag?
Answer:
24 silver atoms.
Explanation:
11.5 moles of silver atoms will have = 11.5×6.022×1023=6.925×1024 11.5 × 6.022 × 10 23 = 6.925 × 10 24 silver atoms.
Hope this helps!
Brain-List?
According to Avogadro's number, there are 6.926×10²⁴ representative particles in 11.5 moles of silver.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number or number of moles×Avogadro's number=11.5×6.023×10²³=6.926×10²⁴ atoms.
Thus, there are 6.926×10²⁴ representative particles in 11.5 moles of silver.
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Write ashort note on the
first battle of
of panipat
Answer:
The First Battle of Panipat was fought between the invading forces of Babur and the Lodi Empire, which took place on 21 April 1526 in North India. It marked the beginning of the Mughal Empire. This was one of the earliest battles involving gunpowderfirearms and field artillery.
For you to write an essay on Panipat first bring into view
Introduction body conclusionThen write a brief story using this format.
How to write a short note on the first battle of Panipat?In writing this essay, you must consider the structure and content of the essay or short note
For structure kick off with
Introduction body conclusionIn conclusion, for the content of the short note you can consider this,
Panipat fought its first battle on 21 April 1526 in the North of India, This battle was fought between the invading powers of Babur and the Lodi Empire.
Read more on History
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2. Explain Why would it be difficult to find the volume of a rock using
a ruler?
Answer:
Most of these rocks are not made up of common geometric shapes
Explanation:
Because most rocks are not made up of common geometric shapes, it would be difficult or impossible to find the volume of a rock using a ruler; there would be no easy way to measure the rock's volume using a ruler
Hope this helped!
Queston
Which equation shows how to calculate how many grams (g) of KOH would
be needed to fully react with 4 mol Mg(OH)2? The balanced reaction is:
MgCl2 + 2KOH → Mg(OH)2 + 2KCI
OA. mol Mg(OH),
2 mol KOH
mol Mg(0H),
56.10 g KOH
1 mol KOH
2 mol KOH
1 mol Mg Cl,
56.10 g KOH
1mol KOH
OB. mol Mgch
1
1mol Mg(OH),
2 mol KOH
1mol Ma(0H),
56.10 g KOH
1 molkOH
mol Mg (OH,
1 mol KOH
2 mol Ma(OH)
56 10 g KOH
1mol KOH
OD.
Answer:
C
Explanation:
We know that the molar mass of KOH is 56 gmol-1
Molar mass of Mg(OH)2 is 58.31 g/mol
Now; the balanced reaction equation is; MgCl2 + 2KOH → Mg(OH)2 + 2KCI
Hence;
2 moles of KOH yields 1 mole of Mg(OH)2
4 moles of KOH yields;
4 moles of KOH/1 mol * 1 mole Mg(OH)2 /2 moles KOH * 58.31 g Mg(OH)2 / 1 mole Mg(OH)2
So option c is correct
Answer:
4mol MG(OH)2/1 * 2mol KOH/1 mol MG(OH2) * 56.10g KOH/1 mol KOH
Explanation:
Took the test
what element is in group 13, period 4
Answer:
Gallium
Explanation:
Answer:
Gallium
Explanation:
PLZ
how many molecules are in 2so4
Answer:
1 grams (NH4)2SO4 to mol = 0.00757 mol 10 grams (NH4)2SO4 to mol = 0.07568 mol 50 grams (NH4)2SO4 to mol = 0.37839 mol 100 grams (NH4)2SO4 to mol = 0.75678 mol
Explanation:
determine the molar mass for ammonia (NH3) in g/mol.
Answer:
17.031 g/mol
Explanation:
Identify the type of solid from the description. Select from the following choices: metallic solid, network solid, molecular solid, ionic solid, or amorphous solid
Identify the type of solid from the description. Select from the following choices: metallic solid, network solid, molecular solid, ionic solid, or amorphous solid. a. This solid is ductile and conducts electricity.b. This solid is not conductive and has a low melting point.
Answer:
See explanation
Explanation:
A is a Metallic Solid
Let us look again at the physical properties of metals;
Metals are
DuctileMalleableSonorousHigh melting pointConducts electricityWe can now see that both ductility and electrical conductivity are metallic properties.
B is a Molecular solid
Molecules are formed when atoms share electrons. In molecules, there are no free electrons hence molecules do not conduct electricity.
Secondly, molecules are held together in the solid state by weak dispersion forces hence molecular solids have a low melting point.
In a chemical formula, the number of each type of atom in the compound is shown by numbers called what?
Answer: Subscripts
Explanation: Those are the little numbers next to each atom in a chemical formula.
Ppredict the identity of the precipitate in the below reaction:
BaCl2(aq) + K2SO4(aq) →
Answer: The precipitate formed is [tex]BaSO_4[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid or precipitated form are represented by (s) after their chemical formulas.
A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced chemical equation is:
[tex]K_2SO_4(aq)+BaCl_2(aq)\rightarrow BaSO_4(s)+2KCl(aq)[/tex]
why does brain be liek fmrknve; n yyy eekf pls call for help
Answer:
man my brain like that to
Explanation:
Answer:
man my brain like that to
Explanation:
The United States National Weather Service reports pressure in mm of Hg. What's the pressure of 725 mmHg in Pa, millibars, and Torr?
A. 101.325 Pa, 966 millibar, 725 Torr
B. 100,000 Pa, 1000 millibar, 760 Torr
C. 96,657 Pa, 966 millibar, 725 Torr
D.100.000 Pa, 760 millibar. 725 Torr
Answer:
C. 96,657 Pa, 966 millibar, 725 Torr
Explanation:
The pressure of 725 mmHg in Pa, millibars, and Torr is 96,657 Pa, 966 millibar, 725 Torr. Hence option C is correct.
What is pressure?Pressure is defined as the force that is applied perpendicularly to an object's surface in relation to the area that it is dispersed over. Pressure can actually be a very good thing. Stress only occurs and has a fully negative impact when it continues to grow and that sensation of serenity and order is replaced with one of being out of control.
Given pressure = 725 mmHg
1 mmHg = 133.32 Pa
725 mmHg = 133.32 x 725 Pa
= 96,657 Pa
1 mmHg = 1.333 millibar
725 mmHg = 725 x 1.333 millibar
= 966 millibar
1 mmHg = 1 torr
725 mmHg = 725 Torr
Thus, the pressure of 725 mmHg in Pa, millibars, and Torr is 96,657 Pa, 966 millibar, 725 Torr. Hence option C is correct.
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How do sound waves travel? PLEASE HELP IF YOU WANT BRAINLEIST AND ME TO LIKE URE COMMENT!!
A. Sound causes the air near it to vibrate inwards.
B. waves radiate outward from a central point.
C. Sound moves randomly in different directions.
D. Sound transforms waves into different frequencies.
The answer is A. The vibration caused by the waves through the air eventually weaken, which is why sound diminishes easily over distance.