Answer:
Woah don't cash app whats the question
Which is the mass of 0.13 moles of potassium chloride, KCl
Answer:
9.69 grams
Explanation:
e
Answer:
9.69g KCl
Explanation:
[tex]0.13 molesKCl\frac{74.55gKCl}{1moleKCl} =9.69gKCl[/tex]
What does climate change have to do with chemistry
Answer:
Well there are chemicals in the air like CO2 and nitrogen
Explanation:
These are chemicals and chemists deal with chemicals
Use the information in the table to calculate ASrxn
for each of these reactions. Round all answers to
nearest whole number.
Answer:
-198
-5
-148
Explanation:
The entropy of a system is usually denoted by the symbol 'S'. The change in entropy is given as ΔS. It is generally expressed in JK⁻¹mol⁻¹.
What is entropy?The entropy is defined as the property of a system which measures the disorder or randomness of the system. Like internal energy and enthalpy entropy is a state function and it is also an extensive property.
The change in entropy is given as:
ΔS reaction = S-Products - S -Reactants
1. ΔS = (2 × 192.5 - (3 × 130.58 + 191.50) = -198.24 J/K
2. ΔS = (213.6 + 2 × 188.83) - 186.3 + 2 × 205.0 = -5.04 J/K
3. ΔS = (2 × 220.0) - (2 × 191.50 + 205.0) = -148 J/K
For spontaneous process in isolated systems, the entropy change is positive. The greater the disorder in a system, the higher is the entropy. The solid state has lower entropy.
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2) Which of the following statements are true about energy and matter?
The transfer of energy through empty space can be by radiation.
Conduction is heat transfer by direct contact of particles of matter.
Conduction is the transfer of heat by the movement of a heated fluid.
Density is a measure of how much mass there is in a volume of a substance.
The movement of energy from a warmer object to a cooler object is called heat
transfer.
Answer:
the transfer through empty space can be radiation
Explanation:
because when it transfers it turns into radiation
PLSSS HELP
How is a balanced chemical reaction, like N2 +
3H2 --> 2NH3, similar to a recipe?
Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.
Explanation:
True or False: Different substances, like shortening and soap, will melt at the same temperature. True False
Answer:
false
Explanation:
different things will have different melting points
4 Which pair of ions is isoelectronic?
A Ca2+ and 02-
B Na+ and 02-
OC Lit and Cl-
OD Mg2+ and CI-
Answer:
B. Na+ and O2-
Explanation:
Na+ plus has 10 electrons and O2- also has 10 electrons
How many molecules of HCl would react with 2 moles of Al?
2Al + 6HCl → 2AlCl3 + 3H2
Answer:
3.612 × 10^24 molecules
Explanation:
The balanced chemical equation in this question is given as;
2Al + 6HCl → 2AlCl3 + 3H2
Based on the equation, 2 moles of Aluminum (Al) is needed to react with 6 moles of HCl
Since 1 mole of a substance is equal to 6.02 × 10^23 molecules;
This means that, according to the question, 6 moles of HCl needed to react with 2 moles of Al will contain;
6 × 6.02 × 10^23 molecules
= 36.12 × 10^23
= 3.612 × 10^24 molecules
In a nutshell, 3.612 × 10^24 molecules of HCl would react with 2 moles of Al.
Answer:
1.806 × 10^24
Explanation:
Write the information provided by a balanced equation.
Answer:
2 Fe 2O 3 + 3 C → 4 Fe + 3 CO 2
Explanation:
yeap
What is the percent by mass (mv) of a solution with 1.56 g of benzene dissolved in gasoline to make 998.44 mL of solution? (density of gasoline = 0.7489 g/mL)
please I need help lol
Answer:
The percentage by mass of benzene in the solution is approximately 0.2%
Explanation:
The given parameters are;
The mass of the benzene solute dissolved in the gasoline solvent, m₁ = 1.56 g
The total volume of the benzene gasoline solution made, V = 998.44 mL
The density of gasoline, ρ = 0.7489 g/mL
Mass, m = Density, ρ × Volume, V
∴ The mass of gasoline in the 998.44 mL, solution = 0.7489 g/mL × 998.44 mL = 747.731716 g
The total mass of the solution = The mass of the benzene in the solution + The mass of the gasoline in the solution
∴ The total mass of the solution = 747.731716 g + 1.5 g = 749.231716 g
[tex]The \ percentage \ by \ mass = \dfrac{The \ mass \ of \ a \ fraction}{(The \ mass \ of \ the \ total \ solution)} \times 100[/tex]
The percentage by mass of benzene in the solution = (1.5 g/749.231716 g)×100 ≈ 0.2% by mass.
366 Cal to kilowatt-hours, how to convert?
Answer:
0.000425 kilowatt hour
Identify the elements that make up water and ozone .Name the element common between the two molecules .
Answer: Water is made up of elements hydrogen and oxygen. Ozone is made up of element oxygen. The common element between them is oxygen.
Explanation:
Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions.Example: Hydrogen (H)
Water and ozone are compounds which are formed by the combination of elements in fixed ratio by mass.Water and ozone have molecular formulas of [tex]H_2O[/tex] and [tex]O_3[/tex] respectively.Water is made up of elements hydrogen (H) and oxygen (O). Ozone is made up of element oxygen (O).
Thus the common element between them is oxygen (O).
Which of the following is the correct chemical equation and is properly balanced for:
Iron III oxide reacts with potassium iodide to produce iron III iodide and potassium oxide
Answer:are there any abc or do you have to make an answer?
Explanation:
6. An acidic solution of potassium dichromate is mixed with an aqueous solution of
hydrogen peroxide.
what is valency pls i need it now
If a 60 kg object is moving at a velocity of 10 m/s and it's 25 meters high off the ground what would if mechanical energy be?
Answer:
Like all questions in this sublevel, the work done by non-conservative forces must be related to the changes in energy of the object (see Physics Rules section above). In the case of the car skidding to a stop, the kinetic energy equation (see Formula Fix section below) can be used to determine the initial and final kinetic energy of the car. Since the car is on the ground, the height and potential energy can be regarded as zero.
Explanation:
Calculate the reaction rate given the following:
After 2 minutes (120 seconds), the concentration of a product was measured to
increase from 0.0012 M to 1.48 M.
1.48 M/s
0.0123 M/s
0.0012 M/s
-0.0123 M/s
Answer:
0.0123 M/s
Explanation:
The reaction rate is the rate at which the reaction takes place and results in an increased concentration of the products. The rate of the reaction is 0.0123 M/s.
What is the reaction rate?
The reaction rate is the increase of the concentration of the product with respect to time in seconds. The rate of reaction is given by,
[tex]\rm rate = \rm \dfrac {\Delta C}{\Delta t}[/tex]
Given,
Change in product concentration = 1.478
Time period = 120 seconds
Substituting values in the above equation:
[tex]\begin{aligned} \rm rate &= \rm \dfrac {\Delta C}{\Delta t}\\\\& = \dfrac{1.478}{120}\\\\&= 0.0123 \end{aligned}[/tex]
Therefore, option B. 0.0123 M/s is the reaction rate.
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What are examples of physical properties of substance? Select all that apply. A Solubility B Odor C Color D Flammability
Solubility, odor, and color are physical properties; they can all be discerned without having to subject a substance to a chemical change. Flammability, on the other hand, is a chemical property. Thus, choices A, B, and C would be correct examples of physical properties.
How many neutrons does calcium have?
.20. 60. 79. 40
Answer:
20
Explanation:
Atomic number/proton number = 20 (protons in nucleus)
Atomic mass number = 40 (protons + neutrons in nucleus)
40 - 20 = 20
Algae and other phytoplankton are the major producers of the earth's:
oxygen
carbon dioxide
hydrogen
nitrogen
Answer:
oxygen
Explanation:
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Where are most algae found?
on the surface of lakes
growing on the ocean bottoms
floating on water world-wide
in forests around the world
Answer:
on the surface of lakes
Explanation:
How many molecules are in 5.60 L of oxygen gas
Answer:
5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.
Solve and show work. Li2S + 2 HNO3 --> 2 LiNO3 + H2S (a) Calculate the mass of lithium sulfide that will react with 250 mL of 0.65 M nitric acid (b) How many mL of 9.6 M HNO3 are needed to make 250 mL of 0.65 M HNO3 solution? (c) How many grams of nitric acid are needed to make 750 mL of 9.6 M HNO3.
Li2S + 2 HNO3 --> 2 LiNO3 + H2S
Li2 S + H2 N2 O2 --> Li2 N2 O5 + H2 S
Li S + H2 N2 O5 -> Li N2 O5 + H2 S
Li2 S2 + H4 N4 O10 --> Li2 N4 O10 + H4 S2
Li^2 S^2 + H^4 N^4 O^10 --> Li^2 N^4 O^10 + H^4 S^2
Please Help!
How is a pure sample of cobalt obtained
A bowler lifts her bowling ball a distance of 0.5 meters using 35 joules of energy. If, on Earth, a 1.0 kilogram mass weighs 9.8 newtons, the mass of the bowling ball used by this bowler is about;
Answer:17.5
Explanation: (0.5 meters)(35 Joules) =
When the bowler lifts the bowling ball for a distance of 0.5 m, the mass of the bowling ball used by the bowler is 17.3 kg.
What is Energy?The ability to do work is called Energy.
As work done and energy has the same units. The energy required is equal to the work done.
E = W = 35 J
Force acting on the ball is equal to the weight of the ball.
F = Weight =mg
where m = mass of the bowling ball and g = acceleration due to gravity
Substituting the given energy and distance moved, we have
[tex]35 = m\times9.81\times0.5\\ m=17.3 \:\rm kg[/tex]
Therefore, the mass of the bowling ball is 17.3 kg.
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Why is balance important in organisms?
Give one safety precaution should take during carbon and lead oxide experiment
Answer:
use safety goggles
Explanation:
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Please help! It’s due today. I’ll give brainliest
1. What was the mass of a sample of water if the addition of 4280 joules raised the temperature of the sample from 22.00C to 34.50C?
2. What is the specific heat of a sample of an alloy if 3750 joules of heat are released when a 315 gram sample of alloy cools from 78.00C to 28.40C?
3. The specific heat of iron is 0.448 J/g0C. What will be the final temperature if 35000 joules of heat are added to a 454 gram sample of iron at 24.00C?
4. What will be the final temperature when 8750 joules are added to 75.0 grams of water at 23.00C?
5. When 38800 joules were added to a sample of iron, specific heat 0.448 J/g0C, the temperature rose from 24.5 deg C to 178 deg C. What was the mass of the iron sample?
Explanation:
Number 1
Q = 4280J
mass = x
∆∅ = 34.5 - 22
∆∅ = 12.5°C
Specific heat capacity of water = 4200J
Q = mc∆∅
4280 = x(4200)(12.5)
4280 = 52500x
x = 4280/52500
x = 0.0815kg
Number 2
c = x
Q = 3750
m = 315g
∆∅ = 78 - 28.4
∆∅ = 49.6°C
Q = mc∆∅
3750 = 315×x×49.6
3750 = 15624x
x = 3750/15624
x = 0.2400J(g°C)-¹
Number 3
c = 0.448
Q = 35000
m = 454g
∆∅ = x
Q = mc∆∅
35000 = 454(0.448)(x)
35000 = 203.392x
x = 35000/203.392
x = 172.0815
∅2 - ∅1 = ∆∅
∅2 = ∆∅ + ∅1
∅2 = 172.0815 + 24
∅2 = 196.0815
∅2 = 196°C
Number 4
Q = 8750J
m = 75g = 0.075
c = 4200J/kg/°C
∆∅ = x
Q = mc∆∅
8750 = 0.075(4200)∆∅
8750 = 315×x
x = 8750/315
x = 27.7778
∅2 - ∅1 = 27.7778
∅2 = 27.7778 + ∅1
∅2 = 27.7778 + 23
∅2 = 50.7778
∅2 = 50.8°C
Number 5
Q = 38800J
c = 0.448J/(g°C)
∆∅ = 178 - 24.5
∆∅ = 153.5°C
m = x
Q = mc∆∅
38800 = x × 0.448 × 153.5
38800 = 68.768x
x = 38800/68.768
x = 564.2159
x = 564g
HELP ASAP Will Give Brainlist
The correct answer is actually
D. requires a lot of energy to become hot.
As the definition of specific heat is "the heat required to raise the temperature of the unit mass of a given substance by a given amount."