When two or more substances are changed into different substances
O
chemical reaction
chemical equations
stoichiomety
O
freezing
Answer: A chemical reaction is a process in which some substances change into different substances. Substances that start a chemical reaction are called reactants. Substances that are produced in the reaction are called products. Reactants and products can be elements or compounds.
1. An acetic acid solution that is 60.0% HC2H302 (by mass) contains
60.0 g acetic acid and 100.0 g water
60.0 g acetic acid and 40.0 g water
60 moles of acetic acid
60.0 g acetic acid and 60.0 g water
Answer:
A solution of acetic acid that is 60.0% HC₂H₃O₂ (by mass) indicates that it contains 60.0 g of acetic acid and 100.0 g of water.
Explanation:
A percentage is a way of expressing an amount as a fraction of 100. The mass percentage corresponds to physical units of the solutions and they allow to establish more precisely the concentration of the solutions and express them in terms of percentages.
Mass percentage indicates the amount in grams of solute per 100 grams of solution.
So a solution of acetic acid that is 60.0% HC₂H₃O₂ (by mass) indicates that it contains 60.0 g of acetic acid and 100.0 g of water.
What is the pH of a solution that has a H+ concentration equal to 1.7 x 10-5 M?
5.20
0.22
10.20
4.77
Considering the definition of pH, the pH is the last option, 4.77.
In firts place, you need to know that pH is a numerical scale used to specify the acidity or alkalinity of a solution. The pH is related to hydrogen ions, since it indicates the amount of these ions present in a solution or substance.
Mathematically, pH is defined as the opposite of the base 10 logarithm or the negative logarithm of the activity of hydrogen ions, that is, the concentration of hydrogen ions:
pH= -log [H⁺]
The pH scale varies from 0 to 14, being acidic solutions with a pH lower than 7 and basic those with a pH greater than 7, while the pH value 7 corresponds to neutral substances.
In this case, being [H+]=1.7×10⁻⁵ M, you can replace this value in the definition of pH:
pH= -log (1.7×10⁻⁵ M)
Solving:
pH=4.77
Then, the pH is 4.77.
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Predict the molar volume of hydrochloric acid required to produce 55 mol of hydrogen gas at STP. A) 0.045 mol/L B) 3.7 M C) 8.9 mol/L D) 15 L
Answer:
A) 0.045 mol/L
Based on your graph in the Periodic Trends Lab, what is the relationship between atomic radius and ionization energy ?
how are cone bearing trees and static electricity connected
Answer: Static electricity will help in seed dispersal in cone bearing seeds.
Explanation:
Static electricity is the stationary electric charge produced by the friction. The static electricity can be produced by the turbulence or air currents in the storm clouds. This is responsible for the cause of lightening phenomena.
The cone bearing seeds exhibit cones that are hard and woody in nature. The static electricity due to the effect of lightening generate electrical shock which breaks open the cone and disperse the seeds. Thus the static electricity is important for seed dispersal in cone bearing trees.
Consider the following generic chemical reaction:
2A+3B→3C How many moles of B are required to completely react with: 8 mol of A, 9 mol of A, 3 mol of A, and 10 mol of A?
Answer:
The number of moles of B that will completely react with;
8 moles of A is 12 moles of B
9 moles of A is 13.5 moles of B
3 moles of A is 4.5 moles of B
10 moles of A is 15 moles of B
Explanation:
From the reaction, we have the mole ratio of the reactants is 2 moles of A combines with 3 moles of B to form 3 moles of C
Therefore, one mole of A which is 2 moles/2 will combine with 3/2 moles of B
Hence 8 moles of A will combine with 8×3/2 or 12 moles of B
9 moles of A will combine with 9×3/2 or 13.5 moles of B
3 moles of A will combine with 3×3/2 or 4.5 moles of B
10 moles of A will combine with 10×3/2 or 15 moles of B
The number of moles of B reacted in each case is obtained by stoichiometry.
The representation of a chemical process on paper is known as a chemical reaction equation. It must consist of a reactant side and a product side. The reactants combine to yield the product.
Given the reaction; 2A + 3B → 3C, we can see that the mole ratio of the reactants is 2 : 3. Hence;
2 moles of A reacts with 3 moles of B
8 moles of A reacts with 8 moles × 3 moles/2 moles
= 12 moles B
2 moles of A reacts with 3 moles of B
9 mol of A reacts with 9 mol × 3 moles/2 moles
= 13.5 moles of B
2 moles of A reacts with 3 moles of B
3 mol of A reacts with 3 mol × 3 moles/2 moles
= 4.5 moles of B
2 moles of A reacts with 3 moles of B
10 mol of A reacts with 10 mol × 3 moles/2 moles
= 15 moles of B
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Consider the complete oxidation of palmitoleic acid,
CH3—(CH)5-CH=CH-(CH2)-COOH, which is a C16
monounsaturated fatty acid found in animal and vegetable oils.
a. How many cycles of ß oxidation are needed?
b. How many acetyl CoA are produced?
c. How many ATP are generated from the oxidation of palmi-
toleic acid?
Answer:
hunit
Explanation:
5
What is the valence of oxygen
Answer:
-2
Explanation:
eACH ELEMENT HAS AN SPECIFIC VALENCE, FOR EXAMPLE, CARBON (+2),+4 IN THE CASE OF OXYGEN IS -2
A cylinder with a constant volume of 2.80 L has a pressure of 32.0 psi at a temperature of 25 deg Celcius. If the cylinder is warmed to a temperature of 75 deg. Celcius, what will be the pressure inside the cylinder?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Charles' gas law is used here. Therefore the new pressure of the given gas is 5.63 atm.
What is ideal gas equation?
Ideal gas equation is the mathematical expression that relates pressure volume and temperature. Vanderwaal gas acts as ideal gas at low pressure and high temperature. There is no forces of attraction between the particles of an ideal gas.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
At constant volume
P₁/T₁ = P₂/T₂
32.0 psi ÷298 K =P2÷348 K
P2 = 7.55÷1.34 = 5.63 atm
Therefore the new pressure of the given gas is 5.63 atm.
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How many moles of O2 are needed to produce 50.0 moles of CO2?
2 C8H18 + 25 O2 --> 16 CO2 + 18 H20
a) 78.1 moles
Answer:
4 moles
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
How did the Sumatra-Andaman earthquake cause so much damage if it occurred in the middle of the Indian Ocean? The earthquake produced a tsunami that caused the destruction. It didn't cause a lot of damage because it was in the ocean. Much marine life was killed. Many sailors and fishermen were killed.
Explanation: because of the waste and junk put into the ocean that must of backfired to the land and the wind would blow stuff at the area hope this helped because I'm not 100% certain
Answer:
The earthquake produced a tsunami that caused the destruction.
Explanation:
The earthquake produced a tsunami that caused the destruction.
Choose the products that complete the reaction. The chemical equations may not be balanced. HCl + NaOH ? NaCl + H2O NaCl + CO2 + H2O NaCl + H2
Answer:
a- NaCl + H20
PLEASE HELPPP!!!
The vapor pressure of a substance is 792 kPa at 0.0 degrees Celsius. What
is the vapor pressure of water at this temperature expressed in atmospheres?
a.1.04 atm
b. 3.26 atm
c. 7.82 atm
d. 5.62 atm
Answer:
I'm pretty sure it's A but I am not 100 present
hope this helps ❤️
If 10 staples have a mass of 1.33 g, what will be the mass of 225 staples?
A.
29.9 g
B.
169 g
C.
1.69 kg
D.
2.99 kg
Answer:
A) 29.9g
Explanation:
first find the weight of 1 staple.
then multiply with 225
Answer: A
Explanation: 1.33/10 = .133
.133* 225 = 29.925 which is about 29.9 grams
A volume of 60.0 mL of a 0.120 M HNO3 solution is titrated with 0.840 M KOH. Calculate the volume of KOH required to reach the equivalence point.
In this chemistry question, the volume of KOH required to reach the equivalence point in this titration is 8.57 mL. This was calculated by first determining the moles of HNO3 in the solution and then using this to determine the equivalent volume of KOH.
Explanation:In a titration, the volume of one solution required to neutralize another can be calculated using the concept of equivalence points and moles. Since the reaction between HNO3 and KOH is a 1:1 reaction, we can first calculate the moles of HNO3 in the solution: 0.120 mol/L * 0.060 L = 0.0072 mol. In a 1:1 reaction, equal moles of both reactants are required, so the amount of KOH needed is also 0.0072 mol. The concentration of KOH is given as 0.840 M, so we can calculate the volume (V) needed using the formula V = Moles/Concentration. Hence, the volume of KOH needed is 0.0072 mol / 0.840 mol/L = 0.00857 L or 8.57 mL.
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To find the volume of KOH required to reach the equivalence point in a titration with HNO₃, we use the molarities and volumes given, and apply the stoichiometry of the balanced equation, which in this case is a 1:1 molar ratio. The required volume of KOH is calculated to be 8.571 mL.
The question asks to calculate the volume of KOH required to reach the equivalence point in a titration with HNO₃. The balanced chemical equation for the reaction is:
HNO₃ (aq) + KOH (aq) → KNO₃ (aq) + H2O (l)
At the equivalence point, the moles of HNO₃ will be equal to the moles of KOH due to the 1:1 molar ratio of their reaction:
Moles of HNO₃ = 0.060 L × 0.120 M = 0.0072 mol
Using the molarity of KOH, we can find the volume needed:
Volume of KOH = Moles of HNO₃ / Molarity of KOH = 0.0072 mol / 0.840 M = 0.008571 L or 8.571 mL
Therefore, 8.571 mL of 0.840 M KOH is required to reach the equivalence point when titrating 60.0 mL of 0.120 M HNO₃.
A redox reaction always involves
A. a change in oxidation number
B. a change in phase
c. the transfer of protons
D. the formation of ions
Answer:a
Explanation:
2. The combined mass of a class of 25 students is about
800 mg
800 g
800 kg
8 t
Answer: i think that it was 800 mg
Explanation:
Where is the least amount of energy transferred in a food web?
Group of answer choices
From primary consumer to secondary consumer
From secondary consumer to primary consumer
From secondary consumer to producer
From producer to secondary consumer
Answer:
From primary consumer to secondary consumer; that is the answer!
Answer: "From primary consumer to secondary consumer"
Explanation:
I took the test (good luck)
Which material gives the soil its high fertility? bedrock sand silt humus
Answer:
Humus
Explanation:
D
Humus gives the soil its high fertility. Therefore, the correct option is option D among all the given options.
What is soil?The living, porous media that has grown in the top layer of the Earth's crust is known as soil. As a source of nutrients and water, a filter for harmful wastes, a site for their breakdown, and a participant for the cycle of carbon and various other elements throughout the planet's ecosystem, soil is one of the main substrates of life on Earth.
It has changed as a result of weathering processes influenced by geographical, geologic, biological, and climatic factors. A practical understanding of soils as well as their management has also developed out of need since the development of crops and forests in the eighth millennium BCE. Humus gives the soil its high fertility.
Therefore, the correct option is option D.
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A balloon starts off with 0.00035 moles of air and has a volume of 0.0081
L. It is inflated to a size of 1.5 L, how many moles of air are in the balloon
now?
Answer:
0.0648 mols
Explanation:
It requires 2,500 joules to raise a certain amount of water (c = 4.186J/g°C) from 20.0°C to 65.0°C.
What is the mass of the water that is being heated?
a 80 g
b 138
c 40 g
d 158 g
Answer:
The answer above is correct - the right option is A.
Explanation:
Hope this helped confirm!
Which of the following would have the highest entropy?
A. A stack of books
B. A house of cards
C. A house made of blocks
D. A pile of laundry
A pile of laundry would have the highest entropy among the given options because it can have many configurations and does not display particular order, making its state more disordered. A building made of bricks has smaller entropy than a pile of bricks because it has fewer arrangements (microstates) that maintain its orderly structure (macrostate).
Explanation:The concept of entropy is associated with the idea of disorder in a system, with a system having high entropy being in a more disordered state. When comparing the options given (a stack of books, a house of cards, a house made of blocks, and a pile of laundry), the pile of laundry would have the highest entropy. This is because it can be arranged in a considerable number of configurations, as it does not display any particular order. In contrast, a stack of books, a house of cards, and a house made of blocks are all structured arrangements with lower entropy due to fewer configurations being available to them.
Explaining why a building made of bricks has smaller entropy than the same bricks in a disorganized pile: an organized structure, like a building made of bricks, has only a limited number of ways it can be put together (microstates) to maintain its orderly structure (macrostate), thereby representing a state of low entropy. On the other hand, a disorganized pile of bricks can be arranged in a vast number of ways, leading to a higher count of microstates and therefore, a higher entropy.
Final answer:
The highest entropy would be associated with a pile of laundry.
Explanation:
The concept of entropy in physics relates to the degree of disorder or randomness in a system. In this context, entropy is a measure of the number of ways a particular macrostate (arrangement or configuration) can be achieved by the microstates (individual arrangements of the system's elements).
Out of the given options, the highest entropy would be associated with a pile of laundry (option D). This is because laundry in a pile has a high degree of randomness and can be arranged in numerous ways, resulting in a large number of microstates. On the other hand, the stack of books (option A), house of cards (option B), and house made of blocks (option C) have lower entropy because they have a more ordered and structured arrangement, limiting the number of achievable microstates.
The movement of material from a more crowded area to a less crowded area is called
A. Diffusion
B. Respiration
C. Osmosis
D. Photosynthesis
The movement of material from a more crowded area to a less crowded area is called diffusion, which achieves equilibrium when the concentration of molecules is equal in both areas.
The movement of material from a more crowded area to a less crowded area is known as diffusion. This natural process involves molecules moving from an area of higher concentration to an area of lower concentration. The process continues until the concentration of molecules is equal in both areas, achieving a state called equilibrium.
Diffusion is also described as the movement of solutes "down the concentration gradient." Osmosis is a specific type of diffusion pertaining to the movement of water across a semi-permeable membrane due to a concentration difference. However, since the question does not specify water or a semi-permeable membrane, the best answer would be option A, which is Diffusion. Respiration and photosynthesis, on the other hand, are biological processes involved in energy conversion and do not describe the movement of materials from a more crowded to a less crowded area.
NEED HELP DESPERATELY!!!
What assumption can be made about the density of two cylinders with similar masses and very different volumes?
A
mass-32
volume 23 mL
B
mass-31
volume 30 ml
PLS help ASAP
I rly don't want to fail 6th grade
Answer:
The density of tube A is greater then the density of tube B having more mass inside of the smaller area.
Explanation:
Answer:
A is denser.
Explanation:
What are the names of the reactants in the reading
passage? 10 points
P + O2 →P4O10
Answer:
The reactants are Phosphorus and Oxygen .
Explanation:
In the equation above, P represents Phosphorus and O represents Oxygen or Oxygen gas.
A professor insists that a research scientist in her laboratory repeat an
experiment, despite the fact that the experiment took several weeks to
complete. Which best explains the professor's reasoning?
Answer:
This is to make sure that the experiment is precise as outside disturbance could cause false outcome
Which acid has the greatest acid dissociation constant?
carbonic acid
boric acid
nitric acid
Answer:
nitric acid
Explanation:
I need help on this question!!
(The actual question and options are in the picture below)
Answer:
A
Explanation:
This picture represents a stationary front. Stationary fronts often form clouds and, in particularly low pressure, have rain or snow. Therefore, the first answer choice is correct. Hope this helps!
Hello, can someone help me? Please
Which velocity changed the most?
Answer:
A
Explanation:
Since acceleration is the change of velocity and f=ma, the change in velocity is dependent on force and mass. Since the force on all of the objects is the same, the one with the least mass will accelerate the most. Object A is the least massive at a mass of 0.5kg, meaning that its velocity will change the most. Hope this helps!