0.0463 mol KCl
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
3.45 g KCl
Step 2: Identify Conversions
Molar Mass of K - 39.10 g/mol
Molar Mass of Cl - 35.45 g/mol
Molar Mass of KCl - 39.10 + 35.45 = 74.55 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.45 \ g \ KCl(\frac{1 \ mol \ KCl}{74.55 \ g \ KCl})[/tex]Multiply/Divide: [tex]\displaystyle 0.046278 \ mol \ KCl[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.046278 mol KCl ≈ 0.0463 mol KCl
A gas has 1.2 L of volume, 1.8 atm of pressure and 264 K temperature. If both the
volume was doubled but the pressure was halved, what would the new
temperature be?
Your answer
Temperature does not change, remains 264 K
Further explanationGiven
V₁= 1.2 L
P₁ = 1.8 atm
T₁ = 264
Required
The new temperature
Solution
The volume was doubled = 2V₁ = 2 x 1.2 = 2.4 L(V2)
The pressure was halved = 0.5P₁ = 0.5 x 1.8 = 0.9 atm(P2)
Combined gas law :
P₁V₁/T₁=P₂V₂/T₂
Input the value :
[tex]\tt \dfrac{1.8\times 1.2}{264}=\dfrac{0.9\times 2.4}{T_2}\\\\T_2=264[/tex]
Potassium permanganate (KMnO2) is used as an explosive agent. How
many moles are there if we have 105.66 grams of potassium
permanganate?
Answer:
0.67mole
Explanation:
Given parameters:
Mass of potassium permanganate = 105.66g
Unknown:
Number of moles = ?
Solution:
To find the number of moles of the given compound;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of KMnO₄ = 39 + 55 + 4(16) = 158g/mol
Number of moles = [tex]\frac{105.66}{158}[/tex] = 0.67mole
What kind of reaction is this?
1. Synthesis
2. Decomposition
3. Single Replacement
4. Combustion
5. Double replacement
6. Acid-Base
Answer:
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Describe a method to investigate how the temperature changes when
different masses of ammonium nitrate are dissolved in water.
You do not need to write about safety precautions.
(6marks)
Answer:
Decrease temperature with increase in ammonium nitrate concentration.
Explanation:
The temperature changes when different masses of ammonium nitrate are dissolved in water because the ammonium nitrate takes energy from the surrounding water environment for the breaking of ionic bonds as a result the temperature of water decreases. When more concentration of ammonium nitrate is added to water, more decrease occur in temperature of water and the water becomes cold.
Hotness or a cold state of a substance or a solution is measured physically by temperature. It is measured by a device called a thermometer and can be in the form of Kelvin, degree Celsius or degree Fahrenheit.
Decreasing the temperature with an upsurge in the ammonium nitrate concentration can be used in determining the change in the temperature.
The change can be explained as:The alteration in temperature can be seen after adding more ammonium nitrate with various concentrations to the water.Ammonium nitrate accepts energy from the water present in its surrounding solution for splitting the ionic bonds present.This energy acceptance from water reduces the temperature of the water and with the increase in concentration lowers the water temperature more.Therefore, increased concentration reduce temperature.
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If you used 10 grams of aluminum, how many moles of aluminum chloride can be produced?
Answer:
When 20.0 grams of aluminum and 30.0 grams of chlorine are reacted according to the above equation, the chlorine is the limiting reactant and the maximum yield of aluminum chloride is 0.28 moles or 37.33 grams.
2Na + 2H2O → 2NaOH + H2
How many grams of NaOH could you make with 8.0465 g of Na?
? g NaOH (use 5 sig fig
According to the stoichiometry of the given chemical equation, 13.9939 grams of NaOH would be made with 8.0465 g of Na.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. It is useful in balancing chemical equations and making solutions of different concentrations.As according to the given chemical equation 46 g sodium gives 80 g sodium hydroxide, thus, 8.0465 g of sodium will give 8.0465×80/46=13.9939 grams.
Thus, 13.9939 grams of NaOH would be made with 8.0465 g of Na.
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2. When an atom loses an electron, it becomes a
_a._positive ion.
c. neutral ion.
b. negative ion.
d. neutral atom.
Answer:
A
Explanation:
Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.
Someone help plzzzz just need final answers I’ll mark Brainly
Answer:
Omodium
Explanation:
It’s Umodium
Chemical equilibrium is relatively rare in living cells. An example of a reaction at chemical equilibrium in a cell would be
Answer:
(D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway
Explanation:
A) a reaction in which the free energy at equilibrium is higher than the energy content at any point away from equilibrium
B) a chemical reaction in which the entropy change in the reaction is just balanced by an opposite entropy change in the cellʹs surroundings
C) an endergonic reaction in an active metabolic pathway where the energy for that reaction is supplied only by heat from the environment
D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway
E) no possibility of having chemical equilibrium in any living cell
The correct answer for a reaction that describes chemical equilibrium in a cell would be a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway .
A reaction in chemical equilibrium is a bi-directional reaction in which both the reactants and the products are present in a stoichiometrically balanced way within the system at a given period of time under specific conditions.
From the definition, a reaction would be in equilibrium if
both the reactant and product are present but have ceased being producednone of the reactant or product is being used by another process within the cell.The correct option is, therefore, D
The radii of the atoms become smaller from sodium to chlorine across period 3. This decrease is primarily a result of
Answer:
Nuclear Charge
Explanation:
As we move from sodium to chlorine across, there's increase in atomic number (protons). This also means there is increase in the valence electrons (The valence electrons is denoted by the group).
As the number of protons increases, the nuclear energy also increases. Due to this, the electrons are attracted more strongly and pulled closely to the nucleus.
What type of stress results when two plates converge? Compression Shear Hot spot
Answer:
Compression
Explanation:
Hi! When two convergent plates collide, they should create compressive pressure, or compression.
Convert this temperature from °F to °C. Explain how pls?
-2.2 C
10.6°C
2.2°C
33.3°C
Answer:
Start with the temperature in Fahrenheit (e.g., 100 degrees).
Subtract 30 from this figure (e.g., 100 - 30 = 70).
Divide your answer by 2 (e.g., 70 / 2 = 35).
What method would a geologist use to determine the approximate age of a rock found in a newly discovered formation?
Complete the table by checking the correct column(s) for each description.
Description
Isotonic
Solution
Hypotonic
Solution
Hypertonic
Solution
7. A solution that has the same osmotic
concentration as a cell's cytoplasm
8. A solution that causes a cell to shrivel
9. A solution that causes a cell to swell
10. A solution that neither shrinks nor swells a cell
11. A solution in which there is more water outside
the cell than inside the cell
12. A solution that causes water to move out of a cell
Answer:
7. isotonic
8. hypertonic
9. hypotonic
10. isotonic
11. hypotonic
12. hypertonic
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How many energy must be absorbed by 150.0 grams of water to raise it's temperature by 50.00°C?
The heat absorbed to raise temperature : Q = 31350 J
Further explanationGiven
m = mass = 150 g
Δt = Temperature difference : 50 °C
Required
Heat absorbed
Solution
Heat can be formulated
Q = m.c.Δt
The specific heat of water = c = 4.18 J/g °C
Input the value :
Q = 150 x 4.18 x 50
Q = 31350 J
Which of the following is an example of erosion in action?
a) Rock on the edge of river
b) Soil material being moved downstream carried by water
c) A desert valley
d) A tree growing next to a lake
Answer:
b) Soil material being moved downstream carried by water
Explanation:
Erosion can be defined as a geological process which typically involves the wearing out of earthen (soil) materials and the transportation of these materials by natural forces like water, wind, etc. Soil erosion is greatest when the soil is steep.
The steepness of a body such as river or stream refers to the downward slope or gradient of the body of water.
Generally, the steepness of a body affects the rate at which other materials would flow or move around. Thus, the steeper a river or stream, the greater would be its rate of erosion.
An example of erosion in action is soil material being moved downstream carried by water.
Why does the sun seem to change position in the sky?
The first major contributor to the Sun's apparent motion is the fact that Earth orbits the Sun while tilted on its axis. The Earth's axial tilt of approximately 23.5° ensures that observers at different locations will see the Sun reach higher-or-lower positions above the horizon throughout the year.
hope this helps ^^
Answer:
Because the earth rotation, when we move around the sun for a whole 365 times then we will have passed 1 year.
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Forty percent of atoms of an element have a mass of 16 AMU. sixty percent of atoms have a mass of 18 AMU. What is the average atomic mass, in AMU, of this element?
Answer:
(16)(.40)+18(.60)= Then the average atomic mass in amu is 17.2What happens to the mass of a substance when it is heated, cooled, or mixed with other substances?
Answer:
the total weight of matter is conserved.
Explanation:
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Ilsa showed her parents a trick she learned in science class. She used water to make ice cubes. Ilsa then placed some ice cubes in a glass containing a clear liquid. The ice cubes floated. She then placed some ice cubes in another glass that also contained a clear liquid. In this glass, the ice cubes sank to the bottom of the glass. Ilsa did not tell her parents that the first glass contained water while the second glass contained rubbing alcohol. What can you conclude from this information?
A.
The ice cubes changed their density.
B.
Water has the same density as alcohol.
C.
Water has a greater density than alcohol.
D.
Alcohol has a greater density than the ice cubes.
Answer:
C. Water has a greater density than alcohol.
Explanation:
From the experiment, it can be shown that water has a greater density than the alcohol.
The ice cube is able to float in the water because, the density of the ice is less than the density of the water.
Density of ice < Density of water
So, the ice cube sinks in alcohol because the density of the ice cube is greater than the density of the alcohol.
Density of ice > Density of alcohol
Therefore, we can assume that since the density of ice is greater than density of alcohol, then the density of water is greater than that of the alcohol.
The molar masses of four unknown gases are shown in the table.
Molar Mass of Unknown Gases
Gas Molar Mass
A 44 g/mol
B 20 g/mol
C 30 g/mol
D 32 g/mol
Which gas is likely to have the lowest rate of diffusion?
a. Gas A
b. Gas B
c. Gas C
d. Gas D
a. Gas A has the lowest rate of diffusion
Further explanationGiven
The molar masses
Required
the lowest rate of diffusion
Solution
Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or
the effusion rates of two gases = the square root of the inverse of their molar masses:
[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]
So :
[tex]\tt r\approx \dfrac{1}{\sqrt{M} }[/tex]
The greater the molar mass, the smaller the rate
So gas A has the lowest rate
Which of the following is the mass in grams of 1 mole of a substance?
Answer:
he molar mass is defined as the mass in grams of 1 mol of that substance. One mole of isotopically pure carbon-12 has a mass of 12 g
Explanation:
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During combustion what type of chemical reaction takes place
Scientific notation
1.9 x 10^3 + 2.3 x 10^4
What type of wave occurs on a guitar because both ends are fixed?
O A. destructive
O B. constructive
C. standing
D. musical
Answer:
Destructive
Explanation:
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Answer: Humans have increased the global temperature due to fossil fuel burning and are negatively contributing to the increase of CO2 emissions and greenhouse gases.
Explanation:
#1 Over the past century humans have negatively impacted the environment by increasing the global temperature due to fossil fuel emissions and a steady increase in the human population which has led to more resources being extracted and used.
#2 Human activities have brought a sudden increase in the global temperature recently due to the increase in greenhouse gas emissions from factories, automobiles, and homes. While we are beginning to use renewable resources, a large portion of our energy consumption still comes from the production and burning of fossil fuels.
#3 Some ways we can start to put a stop to global warming are by using renewable energy resources and decreasing the use of fossil fuel emissions. We can also decrease our carbon footprint by using electric powered vehicles and devices instead of petroleum burning automobiles and home appliances, and by riding bikes and walking over short distances.
Note: Please reword this a bit so you don't get in trouble for plagiarism.
How many atoms are in 12 moles of silver?
Answer:
NA=72.264x1023
Explanation:
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the element found in group iiia and in period 2 is called
Answer:
Boron
Explanation:
The group III A is also known in the periodic table as group 13. The members of the group begin to appear in the second period.
At the beginning of this group III A is boron. Boron is a member of group III A as well as a member or period 2.
Boron is a metalloid and has only three valence electrons as other group III A elements.
Definition surface water
Answer:
Surface Water - water that collects on the surface of the ground. Hope it helped!
Answer: surface water is when water is located of top of the Earth for example rivers, creeks, and wetlands.