[tex]KNO3 (s)[/tex] → [tex]K+ (aq) + NO_3^- (aq)[/tex] is an endothermic reaction and entropy decreasing.
What is an endothermic reaction?An endothermic reaction is any chemical reaction that absorbs heat from its environment.
This reaction [tex]KNO3 (s)[/tex] → [tex]K+ (aq) + NO_3^- (aq)[/tex] is absorbing heat from the surrounding. Endothermic reactions are characterized by positive heat flow (into the reaction) and an increase in enthalpy (+ΔH).
It will lower the entropy of the surroundings by absorbing energy. In doing so the surroundings will lose energy, and randomness is decreased. These reactions are not spontaneous.
Hence, option B is correct.
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Which area is MOST likely to support a marsh ecosystem? a sunny, open area with lots of sand dunes a shallow, sheltered area near an estuary a rocky, coastal area with very high tides deep ocean water miles from a river's mouth
Answer:
coastal area with very high tides deep ocean water miles from a river's mouth
Explanation:
Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges(National Geographic Society).
Animals found in a marsh include; frogs, toads, turtles, snakes, mammals, birds and insects. A marsh is a wetland that is dominated by herbaceous rather than woody plant species(Wikipedia). It is characterized by very high tides deep ocean water miles from a river's mouth.
Answer:
a shallow, sheltered area near an estuary
Explanation:
Why are fossil fuels considered to be a nonrenewable resources? Please help
Answer:
They're considered nonrenewable because they take millions of years to develop. They can't be renewed as fast as we're taking them.
What is the electronegativity difference between oxygen and fluorine? What type of bond is this?
Answer:
Veja, por exemplo, que os elementos mais eletronegativos são os que estão no canto superior direito da tabela, isto é, o flúor (4,0) e o oxigênio (3,5), e os menos eletronegativos são os que estão no canto inferior esquerdo, que são o frâncio (0,8) e o césio (0,8).
Explanation:
A flask contains a mixture of hydrogen gas and water vapor at STP. If the pressure of the water vapor is 19.5 mmHg, then what is the pressure of the hydrogen gas?
779 mmHg
779 mmHg
760 mmHg
760 mmHg
81.7 mmHg
81.7 mmHg
741 mmHg
Answer:
I would say A but not sure
Explanation:
What procedures can be performed on trials 2 and 3 so that the rate of dissolving is the same as trial 1?
Answer:
increase the temperature
Explanation:
if you increase the temperature, the dissolving rate time will decrease.
The procedures that can be performed on trials 2 and 3 so that the rate of dissolving is the same as trial 1 is by increasing the temperature. Therefore, the correct option is option D.
What is rate of dissolution?A solute dissolves together into solvent during the process of dissolution, creating a solution. We are aware that the collisions between the molecules of the solvent and the particles inside the solid crystal are what cause a solid to dissolve in water.
The pace of dissolution will rise if anything is done to make such collisions happen more frequently or with more energy. Consider attempting to dissolve little sugar in a cup of tea. A cube of sugar would dissolve more slowly than a packet of powdered sugar. Stirring or stirring the solution would speed up the rate of dissolution. The procedures that can be performed on trials 2 and 3 so that the rate of dissolving is the same as trial 1 is by increasing the temperature.
Therefore, the correct option is option D.
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What is the name of the compound H₃S₅?
1. Complete the following: (a) Covalent bonds are one type of ___________ forces that are formed when two atoms ______ electron(s) (b) Covalent compounds consists of two __________ atoms (c) Single covalent bond: are formed when two atoms share _______ pair of electrons. (d) Double covalent bond: are formed when two atoms share _________ pairs of electrons. (e) Triple covalent bond: are formed when two atoms share ________ pairs of electrons. (f) A molecule is a neutral groups of atoms that are held together by _______ bonds (g) Diatomic molecule consists of ________ atoms. (h) Molecular compound is made of _________ bonded atoms
Answer:
a) Van der Waals intermolecular forces
b) bonded
c) one pair
d) two pairs
e) three pairs
f) chemical bonds
g) two atoms
h) two or more covalently bonded atoms
Explanation:
(a) Covalent bonds are one type of Van der Waals intermolecular forces that are formed when two atoms share electron(s)
(b) Covalent compounds consists of two bonded atoms
(c) Single covalent bond: are formed when two atoms share one pair of electrons.
(d) Double covalent bond: are formed when two atoms share two pairs of electrons.
(e) Triple covalent bond: are formed when two atoms share three pairs of electrons.
(f) A molecule is a neutral groups of atoms that are held together by chemical bonds.
(g) Diatomic molecule consists of two atoms.
(h) Molecular compound is made of two or more covalently bonded atoms.
Which one do I pick?
Answer:
i would go for the 2nd as far as i know they were a big continent and an earthquake separes them all
An object with a mass of 2.0 kg had a force of 4.9 newtons applied to it.What is the resulting acceleration of the object?
This is from my Science Class !And I haven’t seen this question anywhere !
Answer:
2.45 m/s2
Explanation:
Newton's 2nd law tells us that force is equal to the mass of an object multiplied by its acceleration, or F = ma. We can solve this equation for acceleration by rearranging algebraically:
a = F/m
So:
a = (4.9N)/(2.0kg) = 2.45 m/s2
Which salt shows the least change in solubility from 0 ⁰ – 100 ⁰ C?
Answer:
From the solubility curve, which salt shows the least change in solubility as the temperature increases? NaCl
Explanation:
A halloon has a volume of 456 mL at a pressure of 1.0 atm. It is taken under water in
a submarine t a depth where the air pressure in the submarine is 3.3 atm. What is the
volume of the balloon? assume con- stant temperature.
According to Boyle's law, temperature being constant the volume of the balloon at pressure 3.3 atmospheres is 138.18 ml.
What is Boyle's law?Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.
Mathematically, it can be stated as,
P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.
According to the equation the unknown pressure and volume of any one gas can be determined if two gases are to be considered.That is,
P₁V₁=P₂V₂
Substitution in above equation gives, V₂=1×456/3.3=138.18 ml.
Thus, the volume of balloon is 138.18 ml.
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For the balanced equation shown below, if the reaction of 34.6 grams of C2H4F2 produces 6.90 grams of H2O, what is the percent yield?
2C2H4F2 + 3O2 → 4CO + 2H2O + 4HF
lima ribu juta miliar triliun ......
High conductivity and malleability are characteristics of
True or False: Bald eagles have white heads, which is an inherited trait.
A
True
B.
False
Answer:
A true
Explanation:
Bald eagles have white heads distinguishing them from the rest of their body(which is dark brown
halp balance plez (⊙◡⊙)
Answer: SnO2 + 2 H2 = Sn + 2 H2O
Explanation: I used a balance equation website. It's called WebQC if you want to check it out for future help.
Is neon an atom or ion
16.1 g of bromine are mixed with 8.42 g of chlorine to give an actual
yield of 21.1 g of bromine monochloride.
The question is complete, the complete question is;
16.1g of bromine are mixed with 8.42g of chlorite to give an actual yield of 21.1g of bromine monochloride.
Answer:
91 %
Explanation:
Br2 + Cl2 ------>2BrCl
Number of moles of Chlorine = 8.42/71 = 0.119 moles
If 1 mole of Cl2 yields 2 moles of BrCl
0.119 moles of Cl2 will yield 0.119 moles * 2/1 = 0.238 moles of BrCl
Number of moles of Br2 reacted = 16.1/160 = 0.1 moles
If 1 mole of Br2 yielded 2 moles of BrCl
0.1 moles of Br2 yields 0.1 * 2/1 = 0.2 moles of BrCl
Bromine is the limiting reactant.
Mass of BrCl produced = 0.2 moles * 115.357 g/mol = 23.07 g
Theoretical yield = 23.07 g
Actual yield = 21.1 g
Percentage yield = Actual yield/Theoretical yield * 100
= 21.1/23.07 * 100 = 91 %
In an ionic compound a
Nisbonded to a
The element in the compound that has a positive charge is called the
while the element with the negative charge is called the
Answer:
In an ionic compound a metal is bonded to a nonmetal.
The element in the compound that has a positive charge is called the cation
while the element with the negative charge is called the anion.
Explanation:
In an ionic compound a metal is bonded to a nonmetal.
The element in the compound that has a positive charge is called the cation
while the element with the negative charge is called the anion.
someone please help with this
Answer:
a. triple bond
b.diatomic atom
c. covalent bond
d. non polar covalent bond
e. covalent bond
f. sigma bonds
Please help with chemistry
Answer:
Proton
Explanation:
It has a positive charge
Answer:
electron
Explanation:
A scientist wants to investigate the effect of concentration of nutrient agar to the growth of bacteria. He created 3 set ups: A) 30 g nutrient agar powder in 1 L H2O B) 40 g nutrient agar power in 1L H2O C) 50 g nutrient agar powder in 1 L H2O
1) Based from the given scenario, CREATE a testable hypothesis using IF-THEN- BECAUSE statements.
2) Using your hypothesis, IDENTIFY the dependent and the independent variables.
Find the moles of CaCO3 in 23.4 g of calcium carbonate
Answer:
0.0326 moles
explanation
Answer:
0.234 mol
Explanation:
m(CaCO3) = 23.4g
n(CaCO3) = ?
M(CaCO3) = 100.09 g/mol
n = m/M
n(CaCO3) = 23.4 / 100.09
= 0.234 mol (3 s.f.)
please help me with n5 ty
and don’t waste my time if you don’t know the answer please
Thanks:)
Which does not show earths past environment?
Please hurry I need this :((
lots o points and brainliest To find the atomic mass of an element that is included on a periodic table, what must be found first?
The number of protons in that element.
The average mass of all the isotopes.
The number of electrons in that element.
The number of neutrons in that element.
Answer:
The average mass of all the isotopes.
Option B.
Explanation:
Have a great rest of your day.
The general format AB+CD→AD+BC represents a ____________ reaction.
A. exchange
B. replacement
C. decomposition
D. synthesis
Answer:
D aka synthesis
Explanation:
Got question and got it right :) have a good rest of your day
PLEASE HELP ASAP!!!! WILL GIVE BRAINLIEST TO CORRECT ANSWER!!
The characteristics of a certain gas are shown below.
Characteristics of a Gas
Characteristic Description
Compound Oxygen gas
Condition STP
Mass 4.8 grams
What is the expected density of the above sample of gas?
A. 1.90 g/L
B. 1.82 g/L
C. 1.56 g/L
D. 1.43 g/L
Answer:
1.56g/L it will be as per my calculation if I am not wrong so
Answer: D: 1.43
The expected density of the given sample of oxygen gas at STP can be calculated using the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.
At STP, the pressure is 1 atm and the temperature is 273 K. We are given that the mass of the oxygen gas is 4.8 g. To find the number of moles of oxygen gas, we can use its molar mass, which is 32.00 g/mol:
n = mass / molar mass = 4.8 g / 32.00 g/mol = 0.15 mol
Using the molar volume of an ideal gas at STP, which is 22.4 L/mol, we can find the volume of the oxygen gas:
V = n × molar volume = 0.15 mol × 22.4 L/mol = 3.36 L
Therefore, the expected density of the given sample of oxygen gas at STP is:
density = mass / volume = 4.8 g / 3.36 L = 1.43 g/L
Therefore, the expected density of the given sample of oxygen gas at STP is 1.43 g/L.
Can someone please check my answer??!!!
Answer:
I think its correct
How does stoichiometry work?
Answer:
stochiometry works with measuring quantitative relationships and used to determine the amount of products and reactants that are produced or needed in a reaction
Answer:
Stoichiometry is the calculation of reactants and products in chemical reactions in chemistry. Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals.
CAn someone help me with this?
Answer:
I think D. sorry if I'm wrong:)