Answer:
La mea vola weon
Explanation: Tu mai es zoerrra
Determine the rate of a reaction that follows the rate law:
Answer:
C
Explanation:
I am not 100% sure tho correct me if I'm wrong pls:/
Regarding the formula AI2O3 which of the following is accurate
which of the following reaction would result in a decrease in entropy?
Answer:
C
Explanation:
For each reaction, compare molecules of reactant to molecules of product. Decrease entropy means I'm looking for the one that decreases.
If it takes 56.7 min for the concentration of a reactant to drop to 18.0% of its initial value in a first-order reaction, what is the rate constant for the reaction in the units min-1? You do not need to show your work. You can just write the answer in the space provided below
Answer:
0.00302min⁻¹ = k
Explanation:
In a first order reaction the concentration of the reactant decrease following the equation:
ln[A] = -kt + ln[A]₀
ln [A] / [A]₀ = -kt
Where [A] represents actual and initial concentration of the reactant, k rate constant and t time.
As the reactant drop to 18.0% of its initial concentration [A] / [A]₀ = 0.18
And time = 56.7min:
ln [A] / [A]₀ = -kt
ln 0.18 = -k*56.7min
-1.715 / 56.7min = -k
0.00302min⁻¹ = k
how many molecules of water are present in a 5.65 mole sample of water
Answer:
5.65
Explanation:
Which molecule contains a total of seven carbon atoms?
2-methyl-heptyne
2-methyl-propane
3-methyl-2-hexene
3-methyl-1-pentene
Answer:
3-Methylhex-2-ene
Explanation:
You count the atoms in the stems of the names and add them up.
C. 3-Methylhex-2-ene
Methyl = 1C
Hexene = 6C
Methylhexene = 7C
A. 2-Methylhept-1-yne is wrong. It has 1C + 7C = 8C
B. 2-Methylpropane is wrong. It has 1C + 3C = 4C
D. 3-Methylpent-1-ene is wrong. It has 1C + 5C = 6C
Which energy profile best shows that the enthalpy of formation of CS2 is 89.4 KJ/mol?
Answer:
Option C. Energy Profile D
Explanation:
Data obtained from the question include:
Enthalpy change ΔH = 89.4 KJ/mol.
Enthalpy change (ΔH) is simply defined as the difference between the heat of product (Hp) and the heat of reactant (Hr). Mathematically, it is expressed as:
Enthalpy change (ΔH) = Heat of product (Hp) – Heat of reactant (Hr)
ΔH = Hp – Hr
Note: If the enthalpy change (ΔH) is positive, it means that the product has a higher heat content than the reactant.
If the enthalpy change (ΔH) is negative, it means that the reactant has a higher heat content than the product.
Now, considering the question given, the enthalpy change (ΔH) is 89.4 KJ/mol and it is a positive number indicating that the heat content of the product is higher than the heat content of the reactant.
Therefore, Energy Profile D satisfy the enthalpy change (ΔH) for the formation of CS2 as it indicates that the heat content of product is higher than the heat content of the reactant.
Which of the following is one of the ending compounds during cellular respiration?
Answer:good luck!
Explanation:
+
For the reaction Pb(NO3)2 + 2KI Pbl2 + 2KNO3, how many moles of lead iodide are
produced from 237.1 g of potassium iodide?
Select one:
O a. 0.714
Ob. 5.47e4
O c. 1.54
Od 1.54
Answer: 0.714 moles of [tex]PbI_2[/tex] will be produced from 237.1 g of potassium iodide
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of potassium iodide}=\frac{237.1g}{166g/mol}=1.428moles[/tex]
The balanced chemical reaction is:
[tex]Pb(NO_3)_2+2KI\rightarrow PbI_2+2KNO_3[/tex]
According to stoichiometry :
2 moles of [tex]KI[/tex] produce = 1 mole of [tex]PbI_2[/tex]
Thus moles of [tex]KI[/tex] will require=[tex]\frac{1}{2}\times 1.428=0.714moles[/tex] of [tex]PbI_2[/tex]
Thus 0.714 moles of [tex]PbI_2[/tex] will be produced from 237.1 g of potassium iodide
Why does silver gate tarnish on exposed to air
Answer:
when silver articles exposed to air silver racts with Sulphur present in the atmosphere and form a black layer of silver sulphide on the surface. copper articles get tarnished by reacting with air and water. due to this, a layer is formed over copper vessels.
Explanation: When silver is exposed to sulfur-containing gases in the air, it discolours and then darkens as it reacts with the gas to form a surface layer of tarnish If a silver object is to be kept from tarnishing, it must be protected from sulfur-containing gases.
According to the phase diagram for H20 what happens to the phases of water at 1 atm pressure as the temperature is increased from -10 degrees Celsius to 110 degrees
Answer: D. Water changes from a gas to a solid to a liquid.
Explanation:
Wat
According to the phase diagram for [tex]H_{2}O[/tex] water changes from a solid to a gas to a liquid at 1 atm pressure as the temperature is increased from -10 degree Celsius to 110 degree Celsius.
Phase diagram for water systemThe phase diagram of water system comprises graphical representation of various phase. The slope of line connecting the solid state and liquid states is -ve (negative) rather than +ve (positive).
Water is an unusual substance in solid state is less denser in its liquid state. In liquid state of water ice floats.
Water exists 3 phases the solid phase (ice), the liquid phase (water),the gaseous phase (steam).Here, the phase of water changes from a solid to a gas to a liquid.
Thus, from above conclusion we can say that water changes from a solid to a gas to a liquid at 1 atm pressure as the temperature is increased from -10 degree Celsius to 110 degree Celsius.
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What is the molality of a solution that contains 418.8 g HCl in 4.62 kg water?
Select one:
O a. 2.49
Ob. 0.00249
O c. 15.3
Od.4.19e5
Answer:
a. 2.49
Explanation:
Molar mass of HCl= 36.46 g
So, no. of moles=418.8/36.46=11.48
Molality= no. of moles/mass of solvent= 11.48/4.62= 2.49
Which of the following best describes the transfer of fecal coliform and an impact on the environment?
Fecal coliform increases the growth of algae in surface water bodies, killing fish.
Digestive problems in humans are elevated from the increase of fecal coliform into drinking water.
Fecal coliform decreases the amount of dissolved oxygen and an overpopulation of fish in surface water bodies occurs.
Fecal coliform increases the amount of organic substances in water and lowers the amount of dissolved oxygen, killing fish.
Answer:
Fecal coliform increases the amount of organic substances in water and lowers the amount of dissolved oxygen, killing fish.
Explanation:
Fecal coliform are species of bacteria that are found in the intestine of warm-blooded animals like humans etc. Hence, they are released whenever they excrete feaces. Due to this reason, the presence of fecal coliform bacteria in a water body indicates fecal discharge into that water.
The presence of excessive fecal coliform in a water body increases the amount of organic substances in the water. These organic substances are decomposed by bacteria, which causes the oxygen present in the water body (dissolved oxygen) to deplete/decrease. The depletion of oxygen in the water threatens aerobic aquatic organisms e.g fishes and they ultimately suffocate and die.
Give the IUPAC name of the given compound.
(CH3)-CH(NH2)-CH3
this compound is called 2-propanamine 2 indicates the position of the amino group propan- indicates the radical (joy123333 do they make anyone a mod?)
SUPPLEMENTARY QUESTION
1. Calculate the amount of heat (in calories) absorbed when 50 g of water at 20°C spreads over your skin and
warms to body temperature, 370C?
Answer:
850 Calories.
Explanation:
The following data were obtained from the question:
Mass (M) = 50 g
Initial temperature (T1) = 20 °C
Final temperature (T2) = 37 °C
Specific heat capacity (C) of water = 1 cal/g°C
Heat absorbed (Q) =..?
Next, we shall determine the change in temperature of water.
This can be obtained as follow:
Initial temperature (T1) = 20 °C
Final temperature (T2) = 37 °C
Change in temperature (ΔT) =..?
Change in temperature (ΔT) = T2 – T1
Change in temperature (ΔT) = 37 – 20
Change in temperature (ΔT) = 17 °C
Finally, we shall determine the heat absorbed. This can be obtained as follow:
Mass (M) = 50 g
Specific heat capacity (C) of water = 1 cal/g°C.
Change in temperature (ΔT) = 17 °C
Heat absorbed (Q) =..?
Q = MCΔT
Q = 50 x 1 x 17
Q = 850 Calories
Therefore, the heat absorbed is 850 Calories.
what is ionic and covalent
Answer:
The two most basic types of bonds are characterized as either ionic or covalent. In ionic bonding, atoms transfer electrons to each other. ... In short, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.
Hope this helps.....
Pls mark my ans as brainliest :)If u mark my ans as brainliest then u r the "BESTESTEST " person in the world
Why do we use moles when calculating empirical chemical formulas, but not the mass?
Answer:
because moles is the chemical unit*Avogadro's number, meaning it's the amount of atoms in the given unit.
Explanation:
Which would cause an electric circuit to lack a current?
open switch
closed switch
lighted bulbs
unlighted bulbs
Answer:
A) open switch
Explanation:
it is an open switch, seeing that when the switch is open, there is a gap between the wire and switch preventing any electric current from flowing. A closed switch is the opposite.
The flow of current is needed to be circuit closed. The electrons are starts following form one end to other end. The lack of current in the circuit is due to open switch.
What is current?Current is said to be the flow of electrons in an electric circuit. The electrons starts flow is mainly due to potential difference.
Current is represented by I.
SI unit of current is Ampere.
In home, the circuit is designed in such a way that, the flow of electricity is controlled by switch. If switch is off mode, there is no electricity flow and glow light or electrical application.
Voltage is the difference in electric potential between two points. Current is just the rate of flow of electric charge.
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Which of the following compounds would be named with a name that ends in -ene?
A. CH3-C triple bond C-CH2-CH2-CH3
B. CH3-CH2-CH2-CH3
C. CH triple bond C-CH2-CH2-CH3
D. CH3-CH2-CH2-CH double bond CH2
Answer:
The answer is option D.
CH3-CH2-CH2-CH=CH2
it's name is Pentene and it's an alkene
Hope this helps you
Why is warm honey easier to pour than cold honey?
A) Increasing the temperature breaks the molecules down into atoms, which are smaller.
B) Increasing the temperature increases the kinetic energy of the molecules, which makes it easier to overcome the attractive forces between molecules.
C) Increasing the temperature converts the sugars into water, which flows easier.
D) Increasing the temperature makes the honey more viscous.
Explanation:
Warm honey is easier to pour because the molecules or what we call as atoms are tightly packed in solids and when solids convert into liquid they flow easily.I HOPE YOU MIGHT FIND THIS VERY HELPFULLWITH LOVE FAULTYDEVILLOVE YA......warm honey easier to pour than cold honey due to Increasing the temperature converts the sugars into water, which flows easier.
What are the components of honey ?
Honey contains sugar, water and other ingredients, where Sugar gives gives sweetness, water maintain fluidity, and other components are present in a least amount and the differences are the color, aroma and taste.
Three types of sugar such as fructose (41%), grape sugar or glucose about 34% and sucrose contain 1 and 2%, other components include minerals, proteins, acids and undetermined matter.
Minerals constitute 3.68%, increase the value of honey for human consumption and the most common minerals are potassium, chlorine, sulfur, calcium, sodium, phosphorus, magnesium, silicon, iron, manganese and copper.
Proteins are collected from nectar and pollen which is the integral parts of plants, acids are also the component, vitamn C and some B complex vitamins such as riboflavin, pantothenic acid, pyridoxine, biotin, nicotinic acid are present.
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Given: 8CO + 17H2 → C8H18 + 8H2O In this chemical reaction, how many grams of H2 will react completely with 6.50 moles of CO? _______ grams of H2 will react completely
Answer:
27.63 g of H2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
8CO + 17H2 → C8H18 + 8H2O
Thus, we can say that:
From the balanced equation above,
8 moles of CO reacted with 17 moles of H2.
Next, we shall determine the number of mole H2 that will react completely with 6.50 moles of CO.
This can be obtained as illustrated below:
From the balanced equation above,
8 moles of CO reacted with 17 moles of H2.
Therefore, 6.5 moles of CO will react with = (6.5 x 17)/8 = 13.813 moles of H2.
Therefore, 13.813 moles of H2 is needed to react completely with 6.50 moles of CO.
Finally, we shall convert 13.813 moles of H2 to grams. This can be achieved by doing the following:
Molar mass of H2 = 2x1 = 2 g/mol
Mole of H2 = 13.813 moles
Mass of H2 =.?
Mole = mass /molar mass
13.813 = mass of H2 /2
Cross multiply
Mass of H2 = 13.813 x 2
Mass of H2 = 27.63 g
Therefore, 27.63 g of H2 is needed for the reaction.
Consider the following intermediate chemical equations.
2
C(s)+102(g) → CO(g)
CO(g) + 2O2(g) –> C0,00)
How will oxygen appear in the final chemical equation?
O O2(g)
as a product
O2(g)
as a reactant
O(g) as a product
20 (9) as a reactant
Answer:
O2(g) as a product
Explanation:
took the test
The substances which appear on the left hand side of the chemical equation are called the reactants and the products are on the right hand side. Here oxygen appears as a reactant in the final equation. The correct option is B.
What is a balanced equation?A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation. A balanced equation obey the law of conservation of mass.
Here the given two equations are:
C (s) + 1/2 O₂(g) → CO (g)
CO (g) + 1/2 O₂(g) → CO₂ (g)
On adding the above two equations:
C (s) + O₂(g) → CO₂ (g)
So in the final chemical equation, oxygen appears on the reactant side. So oxygen is a reactant.
Thus the correct option is B.
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The given question is incomplete, most probably your full question was:
Consider the following intermediate chemical equations.
C (s) + 1/2 O₂(g) → CO (g)
CO (g) + 1/2 O₂(g) → CO₂ (g)
How will oxygen appear in the final chemical equation?
A. as a product
B. as a reactant
C. as a salt
D. as a mixture
can you help me understand this ? I completely dont understand it . i know the tire will burst.
Answer:
There is only one formula to use and we should assume ideal gas. This equation is: PV=nRT. For the following questions manipulate this equation to get the answer.
1. n = PV/RT = (249*1000 Pa)(15.6 L)(1 m^3/1000 L)/(8.314 Pa-m^3/mol-K))(21+273) = 1.59 mol
2. P = nRT/V = (1.59)(8.314)(51+273)/(15.6/1000)(1000) = 274.55 kPa
3. Since the answer in #2 is more than 269 kPa, then the tires will likely burst. 4. Reduce pressure way below the limit 269 kPa.
Explanation:
Answer:
There is only one formula to use and we should assume ideal gas. This equation is: PV=nRT. For the following questions manipulate this equation to get the answer.
1. n = PV/RT = (249*1000 Pa)(15.6 L)(1 m^3/1000 L)/(8.314 Pa-m^3/mol-K))(21+273) = 1.59 mol
2. P = nRT/V = (1.59)(8.314)(51+273)/(15.6/1000)(1000) = 274.55 kPa
3. Since the answer in #2 is more than 269 kPa, then the tires will likely burst. 4. Reduce pressure way below the limit 269 kPa.
Explanation:
What is DNA? A. A Carbohydrate B. A protein C. A nucleic acid D. A lipid
Answer:
C: a nucleic acid
Explanation:
The function of nucleic acids is to store and express genetic information. Since fragments of DNA called genes encode the information to produce certain proteins, they are classified as nucleic acids.
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what is this stone called? and false answers will be deleted. please help, i am making a pendulum
Answer:
A type of granite?
Explanation:
The photo is a bit hard to see, but I'm guessing, from its smooth edges and the streaky colours that its a type of granite?
Looks like the type of granite used on granite tabletops....
I might be wrong, it's just a guess!
Hope this helped in some way....
Bluey :)
Why does increasing the concentration of reactants increase the reaction rate? A. Some of the reactants are likely to act as catalysts. B. The temperature increases with higher concentrations. C. Collisions of the right energy are more likely. D. Increasing the concentration changes the rate constant
Answer:
C. Collisions of the right energy are more likely.
Explanation:
By increasing the concentration of reactants, a higher number of reacting molecules or ions are present in the reaction. This increases the chances of collisions occurring to increase the reaction rate.
Answer: C
Explanation:
collisions of the right energy are more likely
c. What is the mathematical equation for the total pressure below the
surface of a fluid that has air above it? Identify each variable. (1 point)
Answer: Specific gravity=Density of material/Density of water
Explanation:
https://courses.lumenlearning.com/suny-osuniversityphysics/chapter/14-1-fluids-density-and-pressure/
For the reaction 2Na + 2H20 - 2NaOH + H2 how many grams of sodium hydroxide are
produced from 2.21 mol of water?
Select one:
O a. 88.6
Ob. 177
O c. 44.3
O d. 55.4
Answer:
Explanation:
Moles of sodium
=
130
⋅
g
22.99
⋅
g
⋅
m
o
l
−
1
=
5.65
⋅
m
o
l
.
Now you have the stoichiometric equation:
2
N
a
(
s
)
+
2
H
2
O
(
l
)
→
2
N
a
O
H
(
a
q
)
+
H
2
(
g
)
↑
⏐
If there are
5.65
⋅
m
o
l
of metal, clearly
5.65
⋅
m
o
l
2
dihydrogen gas are evolved......, i.e.
2.83
⋅
m
o
l
H
2
. Typically, in a question like this, you would also be asked to calculate the volume the gas occupies under standard conditions, and the
p
H
of the resultant solution (would it be high, low, neutral?).
Hellppp Ethanol, an organic compound, has the following structural formula.
Hн
Н-С-С-0—Н
1
Hн
What is the chemical formula of Ethanol
Ch6o
C2H5O
C2H5O
C2H6O6
Answer:
D) C2H6O
Explanation:
structural formula for ethanol is :
C2H5OH or C2H6O
Answer:
[tex]\boxed{\sf C_2 H_6 O}[/tex]
Explanation:
The structural formula of ethanol is given.
There are 2 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom.
The molecular formula of ethanol is [tex]{\sf C_2 H_6 O}[/tex].
Which statement best describes how energy is important to chemistry?
A. Energy is stored in an atom's electrons.
B. Energy is not conserved during chemical reactions,
C. Energy is absorbed and released during chemical reactions,
D. Energy holds atoms and bonds together,
Answer:
C. Energy is absorbed and released during chemical reactions,
Explanation:
All chemical reactions involve energy. Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Endothermic reactions absorb energy, and exothermic reactions release energy.