Answer:
yay well done good job keep going
Hello people ~
Which of the following fibres is used for making parachutes?
A. Plastic
B. Terelyne
C. Nylon
D. Taylor swift
Answer:
C. Nylon
Explanation:
Nylon is a synthetic fiber, strong, elastic, and holds excellent abrasion resistance. Therefore it is used for making parachutes and ropes for rock climbing.
Answer:
Nylon
Explanation:
Nylon is a synthetic fibre not natural so long lastingIt is highly elastic and strong material.It is water proof also so used for making parachuteshow many atoms of HCl are needed to produce 0.62 moles of hydrogen gas
Answer:
0.2 moles
Explanation:
The equation is given by;
2HCl => H² + Cl²
According to stoichiometry;
[tex] \frac{n \: hcl}{2} = \frac{n \: h {}^{2} }{1} [/tex]
[tex]nhcl = 2 \times nh {}^{2} [/tex]
To produce 0.62 moles of H² gas we need,
nHCL=2×0.62=1.24 moles
Using the relation;
number of moles:Number of atoms/Avogadro's constant
We can then say;
N(numb. of atoms)=n×Na
Number of atoms=1.24×6.02×10²³
Number of atoms=7.5852×10²³ atoms
The world is divided into large areas based on their average temperatures and precipitation. what are these areas called?
climate continents
climate zones
global areas
global regions
The world is divided into large areas based on their average temperatures and precipitation is called climate zones.
What is climatic zone?The principal zones that are demarcated by lines of latitude due to which the earth can be divided on the basis of climate. Tropical zone, Subtropics zone, Temperate zone and Cold zone are the four types of climatic zones.
So we can conclude that large areas based on their average temperatures and precipitation is called climate zones.
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The world is divided into large areas called climate zones based on their average temperatures and precipitation.
What are climate zones?Climate zones are areas of the Earth that results from differences in climate such as temperature, humidity, amount of precipitation etc.
Climate zones of the globe are as follows:
Temperate Arctic or polarSubtropical TropicalTherefore, it can be said that the world is divided into large areas called climate zones based on their average temperatures and precipitation.
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5.00 L of a gas is known to contain 0.965 mol. If the amount of gas is increased to 1.80 mol, what new volume will result ( at an unchanged temperature and pressure) ?
SHOW YOUR SOLUTION.
At an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L
Avogadro's lawAvogadro's law states that equal volumes of different gases contain an equal number of molecules provided temperature and pressure remains in the same conditions. It is expressed;
V₁/n₁ = V₂/n₂
Given the data in the question;
Initial volume; V₁ = 5.0L Initial amount of gas; n₁ = 0.965mol Final amount of gas; n₂ = 1.80mol Final volume; V₂ = ?To determine the new volume, we substitute our given values into the expression above.
V₁/n₁ = V₂/n₂
V₁n₂ = V₂n₁
V₂ = V₁n₂/n₁
[tex]V_2 = \frac{5.00L * 1.80mol}{0.965mol}\\\\V_2 = \frac{5.00L * 1.80}{0.965}\\\\V_2 = \frac{9L}{0.965} \\\\V_2 = 9.22L[/tex]
Therefore, at an unchanged temperature and pressure, if the amount of gas increased by the given value, the final or new volume of the gas is 9.33L
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What is the only non-metal that is not on the upper right side of the periodic table?
Answer:
Hydrogen
Explanation:
Hydrogen number one on the periodic table is on the left side and is a non metal gas.Hydrogen is on the left side because like members of the IA group containing Lithium, Sodium and Potassium it has a normal charge of +1.
Answer:
I believe it is Hydrogen
Explanation:
Describe how electron arrangements are given using Lewis structures.
Answer:
The Lewis structure indicates that each Cl atom has three pairs of electrons that are not used in bonding (called lone pairs) and one shared pair of electrons (written between the atoms). A dash (or line) is sometimes used to indicate a shared pair of electrons: A single shared pair of electrons is called a single bond.
Explanation:
Consider the combustion reaction for acetylene. 2c2h2(l) 5o2(g) right arrow. 4co2(g) 2h2o(g) if the acetylene tank contains 37.0 mol of c2h2 and the oxygen tank contains 81.0 mol of o2, what is the limiting reactant for this reaction? c2h2 o2 co2 h2o
The limiting reactant for the combustion reaction for acetylene is oxygen.
What is limiting reagent?Limiting reagents are those reagent which is present in less quantity as compared to the other reagent present for the formation of product.
Given chemical reaction is:
2C₂H₂(l) + 5O₂(g) → 4CO₂(g) + 2H₂O(g)
From the stoichiometry of the reaction, it is clear that:
2 moles of C₂H₂ = react with 5 moles of O₂
37 moles of C₂H₂ = react with 5/2×37=92.5 moles of O₂
And given moles of oxygen is 81 moles.
81 moles of O₂ = reacts with 2/5×81=32.4 moles of C₂H₂
And given moles of C₂H₂ = 81 moles.
Hence, O₂ is the limiting reagent.
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Answer:
O2 is the limiting reactant.
Calculate the volume that 2.25 mol of o2(g) will occupy at stp.
Explanation:
[tex]2.25mol \times \frac{22.4lit}{1mol} = 50.4 lit o2 [/tex]
Two compounds might have spots with the same rf value in a chromatography experiment and not be identical compounds. Which proposed chromatography experiment could best help determine whether the compounds are identical?.
The repeat of the original chromatography experiment with a different solvent might could best help determine whether the compounds are identical.
What is chromatography?Chromatography is a technique used in the laboratory to physically separate two different objects and/or materials.
In chromatography, these materials are separated into two phases called the stationary phase and the movement phase.
Chromatography is also used to purify a given substance and thus determine its exact composition.
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During this chemical reaction energy is absorbed. In the chemistry lab, this would be indicated by a decrease in temperature or if
the reaction took place in a test tube, the test tube would feel colder to the touch. Reactions like this one absorb energy because
A) the reaction requires activation energy.
B) the reactants have less potential energy than the products.
C)the reactants have more potential energy than the products.
D)the mass of the products is greater than the mass of the reactants.
Reactions like this one absorb energy because the reactants have less potential energy than the products.
What is an Endothermic reaction?This is the type of reaction in which the reactants absorb heat energy from the surroundings to form products.
This brings about a decrease in the temperature as a result of the reactants having less potential energy than the products thereby making option B the most appropriate choice.
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Calculate the Gibbs energy, entropy, and enthalpy of mixing when 1.00mol C6H14 (hexane) is mixed with 1.00mol C7H16 (heptane) at 298K. Treat the solution as ideal.
With Hexane of 1.00 ml and 1.00 ml of hectane at 298, the calculated
Gibbs energy = 3.43Entropy = -3.43Enthalpy = 0How to solve for the Gibbs energyC6H14 = C6H14/C6H14+C7H16
1mol/1mol+1mol = 1/2 = 0.5 mol
1+1 x 8.3145J x 298 x 0.5ln0.5 + 0.5ln0.5
= 4955.442 0.6932
= 3435J
convert to KJ
G mix = 3.43
The Gibbs energy is therefore 3.43KJ/mol
The entropy of the solution-(1+1 x 8.3145J x 298 x 0.5ln0.5 + 0.5ln0.5)
S mix = -3.43 KJ/mol
3.43/298 = 11.5
The enthalpy of the solution
3.43-3.43 KJ/mol
H mix = 0
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How many electrons does calcian have to gain or lose to have 8 valence electrons
Answer:
two electrons
Explanation:
Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon.
HELLO MAY I GET HELP AGAIN?
Answer:
( c ) sunlight.
Explanation:
the leaves are closer to the sunlight they require.
According to the kinetic theory of gases, an ideal gas molecule
Answer:
According to the kinetic theory of gases, in an ideal gas between two successive collisions, a gas molecule travels in a straight line.
According to the kinetic theory of gases, an ideal gas molecule move in a straight line between two successive collisions.
What is the kinetic theory of the gases?The kinetic theory of gases says that the gas is many large numbers of subatomic particles, which randomly motion always.
They move on a straight plane and only change their path when they collide with other molecules or the container's walls.
Thus, according to the kinetic theory of gases, an ideal gas molecule move in a straight line between two successive collisions.
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___ Uses moving air and doesn't pollute the atmosphere.____ uses dead plant matter and burning it releases carbon emissions into the atmosphere.
1. 2.
a. Biomass Energy a. Biomass Energy
b. Solar energy b. Solar energy
c. Hydropower Energy c. Hydropower energy
d. Wind Energy d. Wind Energy
Answer: 1 d. Wind Energy 2. a. Biomass Energy
Explanation:
The use of the moving air has been found to use wind energy, and the dead plants burning is formed with the biomass energy.
What is energy?The energy has been given as the required form to perform a task. The energy can be generated with the pressure and the force of various matters.
Wind energy is produced with the use of the moving air and has been a clean form of energy, i.e. not pollute the region.
The biomass energy has been produced with the use of the dead plants and the matter and releases carbon dioxide.
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hello, I need help with this question
Answer:
carnivores organism get their energy from eating other organisms..
What conditions makes the wind blow faster and stronger?
Larger differences in air pressure over a large area.
Small differences in air pressure over a large area.
Larger differences in air pressure over a small area.
Small differences in air pressure over a small area
Larger differences in air pressure over a small area makes the wind blow faster and stronger.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.
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How much heat energy is needed to change 10 kg of ice at to water at ? , ,
we know that,
W = mL + mcθ
W= 10(336+ 4.2(50))= 5460 kJ
so quantity of heat required is 5460 J
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give the names of the 5 types of chemical reactions you are responsible for
remembering, and also give the letter model(A + C → D etc.)
Answer:
What are 5 types of chemical reactions?
1. Combination (Synthesis) reaction. A + B → AB.
2. Decomposition reaction. AB → A + B.
3. Displacement reaction. A + BC → AB + C.
4. Double displacement reaction. AB + CD → AD + BC.
5. Combustion reaction. CH4 +2O2 → CO2 + 2H2O.
Explanation:
On the basis of the information below, the dissolution of FeF2(s) in acidic solution is A. thermodynamically favorable, because K2 > 1 B. thermodynamically favorable, because K3 > 1 C. not thermodynamically favorable, because K1<1 D. not thermodynamically favorable, because K3 < 1 hint (Hess's law) FeF2(s) – Fe2+(aq) + 2 F"(aq) F"(aq) + H+ (aq) 2 HF(aq) FeF2(s) + 2 H+ (aq) 2 Fe2+ (aq) + 2 HF(aq) K1 = 2 x 10-6 K2 = 1 * 103 K3 = ?
Since K3 is greater than 1, the reaction is thermodynamically favorable.
Data;
FeF2 is in an acidic solutionK2 > 1 is thermodynamically favorablek3 > 1 is not thermodynamically favorableK1<1 is not thermodynamically favorableHess LawThis states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.
Using Hess Law;
[tex]rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2[/tex]
substituting this using Gibbs law,
[tex]\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0[/tex]
Since K3 is greater than 1, the reaction is thermodynamically favorable.
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Which is more active? a. Iron or copper? ___________________
Answer:
iron
Explanation:
has more magnetic metal
Between iron and copper metals, iron is more active than copper metal as it is present above Co in the electrochemical series.
What is electrochemical series?Electrochemical series is a type of reactivity series in which metals are arranged from bottom to the top in the increasing order of their reactivity.
As we know that reactivity is directly proportional to the activity of any element. In the electrochemical series iron is situated at the top position as compared to the copper metal.
So, iron is more active.
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How does the buffer maintain the ph of the solution when an acid is added to it?.
Answer: By reacting with the hydrogen ions.
Explanation:
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Answer:
Electronic configuration of nitrogen: K=2 L=5
Electronic configuration of phosphorus : K = 2 L = 8 M = 5
The element nitrogen will be more electronegative because of the smaller size of its atom. nitrogen accepts electrons more easily.
Explanation:
Explanation:
The atomic number of nitrogen is 7 , so its electronic configuration will be 2 , 5The atomic number of phosphorus is 15 , so its electronic configuration is 2 , 8, 5Nitrogen is more electronegative than phosphorus.
Reason :-
From top to bottom down a group, electronegativity decreases.
Explanation :-
Number of shell increases down a group, so there is an increased distance b/w the valence electrons and nucleus, or a greater atomic radius.
Since nitrogen has a smaller atomic radius than phosphorus, the attraction of its nucleus towards the incoming electron is more than phosphorus. So , because of smaller atomic size nitrogen accepts electrons more easily.
Calculate the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 ml solution.
Taking into account the definition of molarity, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 [tex]\frac{moles}{liter}[/tex].
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Molarity in this caseIn this case, you have:
number of moles= 0.2 molesvolume= 100 mL= 0.1 LReplacing in the definition of molarity:
[tex]molarity=\frac{0.2 mole}{0.1 L}[/tex]
Solving:
molarity= 2 [tex]\frac{moles}{liter}[/tex]
Finally, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 [tex]\frac{moles}{liter}[/tex].
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What is equation for photosynthesis
Answer: The process of photosynthesis is commonly written as: 6CO2 + 6H2O → C6H12O6 + 6O2. This means that the reactants, six carbon dioxide molecules and six water molecules, are converted by light energy captured by chlorophyll (implied by the arrow) into a sugar molecule and six oxygen molecules, the products.
hope this helps!
Answer:
6CO2 + 6H2O → C6H12O6 + 6O2
Explanation:
Which of the following elements has the largest electronegativity?
Fluorine (F)
Bromine (Br)
Lithium (LI)
Calcium (Ca)
Answer:
FLUORINE
Explanation:
It has 5 electrons In Its 2P shell!
Answer:
Fluorine
Explanation:
because it has a score of 4.0 which is the highest possible
Mass defect for oxygen-16 = 0. 13261 amu How many kilograms does the mass defect represent? 1. 66 × 10-27 kg 2. 20 × 10 -28 kg 3. 0 × 108 kg 8. 24 x 1025 kg.
Mass defect for oxygen-16 = 0. 13261 amu, in the kilograms the mass defect equals to 2.20 × 10⁻²⁸ kg.
What is mass defect?Mass defect is the difference between the mass of of an whole atom and the combined mass of its individual particles present in that atom.
We know that, 1 amu = 1.6 × 10⁻²⁷ kg
Given that, mass defect for oxygen-16 = 0.13261 amu
To calculate this defect in terms of kilograms, we have to convert into kg unit as:
0.13261 amu = 0.13261 amu × 1.6 × 10⁻²⁷ kg/amu
0.13261 amu = 2.20 × 10⁻²⁸ kg
Hence option (2) is correct.
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What is the greatest degree of ionic character found in a sulfur bond
Answer:
Chlorine
Explanation:
The reaction between alcohols and carboxylic acids is called
Explanation:
When a carboxylic acid is treated with an alcohol and an acid catalyst, an ester is formed (along with water). This reaction is called the Fischer esterification.
The reaction between alcohols and carboxylic acids is called Fischer esterification.
What is Fischer esterification?Fischer Esterification is an organic reaction that produces an ester by converting carboxylic acids in the presence of excess alcohol and a strong acid catalyst.
This ester is created in the presence of water.
Thus, the reaction between alcohols and carboxylic acids is called Fischer esterification.
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Complete the mechanism for the reaction of butanone with NaBH4 followed by the addition of aqueous acid. Butanone is a 4 carbon chain where carbon 2 is double bonded to oxygen. This reacts with N a B H 4, followed by H 3 O plus to give the final product. Step 1: draw curved arrows. ⟶ Step 2: Draw the charged organic intermediate product. Include nonbonding electrons and charges. Omit the counterion. −→−−H3O+ Step 3: Draw the final product
The formation of a primary alcohol from a ketone involves the use of a ketone and NaBH4 followed by an acid workup.
Formation of a primary alcoholThe question is unclear but clearly relates to the formation of a primary alcohol. The first step in this reaction is the attack of the NaBH4 on the carbonyl carbon of butanone.
The reaction sequence is completed by an acid work up in which an acidic hydrogen is abstracted by the nucleophile to yield a primary alcohol.
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