Answer:
7.7056 x 10^23
Which method of heat transfer takes place when particles of matter vibrate and collide with each other in direct contact? Conduction Convection Insulation Radiation
Answer:
The answer is Conduction.
Explanation:
Conduction occurs when particles collide and vibrate each other.
Answer:
Conduction
Explanation:
When particles of matter collide with each other, they transfer heat by direct contact which is called conduction.
The table shows the atomic number of four atoms.
Which one is NOT a metal?
Answer:
A. Argon
Explanation:
Argon is a nonmetal. It is a noble gas with an atomic number of 18.
Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.
Given the following data:
Number of protons = 18Number of protons = 19Number of protons = 19Number of protons = 20An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.
This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.
In Chemistry, the following chemical elements have this atomic number:
Argon = 18 = 2:8:8Potassium = 19 = 2:8:8:1Calcium = 20 = 2:8:8:2Note: Both group 1 and 2 chemical elements are metals.
However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.
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What factors influence the absorption of sunlight at Earth's surface
Answer:
Solar elevation.
Ozone.
Cloud cover.
Ground surface reflectivity.
Altitude.
Aerosols and pollutants.
Direct and diffuse UV.
I'm not sure if this was what you were looking for, but if it helps please mark me as brainliest.
Which process is based on repulsion of oil and water?
Answer:
We can seprate oil and water by the process of seprating funnel
Bromine water was added dropwise to test tubes containing aqueous solutions of bromide, chloride, and iodide. lodide was oxidized to iodine; bromide and chloride gave no reaction Arrange Br 2 ,Cl 2 ,I 2 in order of their strength as an oxidizing agent.
Answer:
Cl₂ > Br₂ > I₂
Explanation:
An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.
Oxidizing ability decreases down the group.
Therefore Cl₂ > Br₂ > I₂
4. A chemical reaction has the equation 2NaCl (aq) + F2 (g) + 2NaF (s) + Cl2 (g). What type of reaction occurs between NaCl and F2?
A. Double displacement
B. Single displacement
C. Synthesis
D. Decomposition
A chemical reaction has the equation 2NaCl(aq) + F₂ → 2NaF(s) + Cl₂ (g). The reaction type occur between NaCl and F₂ is Single displacement.
Hence, Option (B) is correct answer.
What is a Chemical reaction ?A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.
Now lets check all options one by one
Option (A): Double displacement
A double displacement is a chemical reaction in which elements are exchange between the two compounds. In the given reaction F₂ is not a compound. so this reaction cannot occur
Hence, option (A) is incorrect.
Option (B): Single displacement
A Single displacement reaction is a chemical reaction in which one element replaces the another element in a compound.
In the given reaction F₂ element replaces with the element Na in a compound NaCl. So this reaction occur.
Hence, option (B) is correct.
Option (C): Synthesis
A synthesis reaction is a chemical reaction where two or more substances react to produce a new compound.
In the given reaction two products are formed NaF which is a compound and Cl₂ which is element. So this reaction cannot occur.
Hence, option (C) is incorrect.
Option (D): Decomposition
A decomposition reaction is a chemical reaction in which one reactant breaks down to form a two or more products.
In the given reaction two reactants are given NaCl and F₂. So this reaction cannot occur.
Hence, option (D) is incorrect.
Thus, from above conclusion we can say that The reaction occurs between NaCl and F₂ is single displacement reaction.
Hence, Option (B) is correct answer.
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Water exists as a simple molecule. Describe the bonding present in water and how the electrons are involved in these bonds.
I need help with question 5. Ignore my writing A 25.6 B 26.1 C 26.5 D 26.2
Answer : The correct option is, (C) 26.5 L
Explanation :
The combustion of ethylene is:
[tex]C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(g)[/tex]
First we have to calculate the number of moles of water vapor.
From the balanced chemical reaction, we conclude that:
As, 1 mole of [tex]C_2H_4[/tex] react to give 2 moles of [tex]H_2O[/tex]
So, 0.535 mole of [tex]C_2H_4[/tex] react to give [tex]2\times 0.535=1.07mol[/tex] moles of [tex]H_2O[/tex]
Now we have to calculate the volume of water vapor.
Using ideal gas equation:
[tex]PV=nRT\\\\V=\frac{nRT}{P}[/tex]
where,
P = pressure of gas = 100 kPa
V = volume of gas = ?
T = temperature of gas = [tex]25^oC=273+25=298K[/tex]
R = gas constant = 8.314 L.kPa/K.mol
n = number of moles of gas = 1.07 mol
Now put all the given values in the above formula, we get:
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{1.07 mol\times 8.314 L.kPa/K.mol\times 298K}{100kPa}[/tex]
[tex]V=26.5L[/tex]
Therefore, the volume of water vapor is, 26.5 L.
Which statement is correct about the rate of a chemical reaction? A. It increases when the concentration of reactants increases. B. It does not depend on the concentration of reactants. C. It increases when the temperature decreases. D. It does not depend on the temperature.
Answer:
A) It increases when the concentration of a reactants increases.
Explanation:
I took the test :)
Answer:
Given the data, the correct statement is:
It increases when the concentration of reactants increases (option A)
What is rate of reaction?This is simply defined as the amount of reactants converted or the amount of products formed per unit time. It is expressed as
Rate = (change in reactant or product) / time
Factors affecting rates of reactionVarious factors tends to affect the rate of a chemical reaction. This includes
Temperature Concentration and pressure (for gases) Nature of reactants Surface Area of reactants Light CatalystWith the above information about reaction rates, we can conclude that the correct answer to the question is:
It increases when the concentration of reactants increases (option A)
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At what temperature is the
following reaction feasible:
CaCO3 > CaO + CO2?
Enthalpy data:
CaCO3: -1207 kJ/mol
CaO: -635 kJ/mol
CO2: -394 kJ/mol
Entropy data:
CaCO3: +93 J/K mol
CaO: +40 J/K mol
CO2:+214 J/K mol
A. 1780 K
B.17 K
C. 1105.6 K
OD. 1.1K
Reset Selection
Answer:
Option C. 1105.6 K
Explanation:
The following data were obtained from the question:
CaCO3 —> CaO + CO2
Enthalpy (H) data:
CaCO3 = -1207 kJ/mol
CaO = -635 kJ/mol
CO2 = -394 kJ/mol
Entropy (S) data:
CaCO3 = +93 J/K mol
CaO = +40 J/K mol
CO2 = +214 J/K mol
Temperature (T) =..?
Next, we shall determine the enthalphy change (ΔH).
This is illustrated:
CaCO3 —> CaO + CO2
CaCO3 = -1207 kJ/mol
CaO = -635 kJ/mol
CO2 = -394 kJ/mol
Heat of product (Hp) = -635 + -394 =
- 1029 KJ
Heat of reactant (Hr) = -1207 kJ/mol
Enthalphy change (ΔH) = Hp – Hr
Enthalphy change (ΔH) = - 1029 –(-1207)
Enthalphy change (ΔH) = 178 KJ/mol
Next, we shall determine the change in entropy (ΔS).
This is illustrated below:
CaCO3 —> CaO + CO2
Entropy (S) data:
CaCO3 = +93 J/K mol
CaO = +40 J/K mol
CO2 = +214 J/K mol
Entropy of product (Sp) = 40 + 214 =
+254 J/Kmol
Entropy of reactant (Sr) = +93 J/Kmol
Change in entropy (ΔS) = Sp – Sr
Change in entropy (ΔS) = 254 – 93
Change in entropy (ΔS) = 161 J/Kmol
Finally, we shall determine the temperature (T) at which the reaction was feasible.
This is illustrated below:
Enthalphy change (ΔH) = 178 KJ/mol = 178000 J/mol
Change in entropy (ΔS) = 161 J/Kmol
Temperature (T) =..?
ΔS = ΔH/T
161 = 178000/T
Cross multiply
161 x T = 178000
Divide both side by 161
T = 178000/161
T = 1105.6 K
Therefore, the temperature at which the reaction was feasible is 1105.6 K
PLEASE HELP FAST
Which is the number of moles of carbon dioxide produced from the complete combustion of 5.7 moles of ethanol?
C2H2O + O2 → CO2 + H2O
of
Select one:
O a. 11.4
O b. 17.1
O c. 2.85
O d. 22.8
the sun is 73% hydrogen and 25% helium the rest is other elements what is the percentage of other elements in the sun
Answer:
12%
Explanation:
How many grams of water are produced when 2.50 mol oxygen reacts with hydrogen?
H2 + O2 + H2O
Select one:
a. 45.0 g
b. 22.5 g
c. 90.0 g
O d. 3.6 g
PLEASE HELP
Answer:
it is 90.0
Explanation:
For each of the esters provided, identify the alcohol and the carboxylic acid that reacted.
52. Methyl propanoate+_________
53. Ethyl methanoate+__________
Answer:
52. The alcohol USED => methanol, CH3OH
The carboxylic acid USED => propanoic acid, CH3CH2COOH.
53. The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
Explanation:
52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:
CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O
The alcohol used: methanol, CH3OH
The carboxylic acid used: propanoic acid, CH3CH2COOH.
53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react
Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:
HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O
The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
The reaction 2K(s) + Cl2(1) - 2KCl(s) is a(n)
reaction.*
Answer:
Combination Reaction
Explanation:
The reactants combine for the product
If 15g of iron reacts with 8.5g of oxygen, how many grams of iron oxide will be produced
Answer:
23.5g of FeO
Explanation:
Hello,
The question above is asking us to find the mass of iron oxide produced from 15g of Fe and 8.5g of O. Well, to solve this question, we'll require the equation of reaction.
2Fe + O₂ → 2FeO
From the equation of reaction, 2 moles of Fe plus 1 mole of oxygen will produce 2 moles of FeO
Molar mass of Fe = 56g/mol
Molar mass of FeO = 72g/mol
Molar mass of O = 16 × 2 = 32g/mol
Number of moles = mass / molar mass
Mass = number of moles × molar mass
Mass of Fe = 2 × 56 = 112g
Mass of O = 32g
Mass of FeO = 2 × 72 = 144g
From the equation of reaction, (112 + 32)g (Fe + O2) reacts to produce 144g of FeO
114g of reacts produce 114g of FeO
15g of Fe + 8.5g of O2 = ?
(15 + 8.5)g (Fe + O2) = x
X = (23.5 × 114) / 114
x = 23.5g
Therefore, 15g of Fe and 8.5g of O2 will react to produce 23.5g of FeO
The dots in these cylinders represent the shape and
density of the particles in the different states of matter,
Each dot represents a charged ion, so when two ions
are together in pair, they represent a neutral atom. Which container most likely contains a plasma
Answer:
A I think
Explanation:
Because plasma have ions and B is neutralized with two ions
which three events occur when earths convection currents move toward each other
Answer:
Option A, Tectonic plates above the currents move toward each other.
Option C, One plate will submerge beneath another plate.
Option D, A convergent boundary is formed at the site of the collision.
Explanation:
The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.
Answer:
- Tectonic plates above the currents move toward each other;
- One plate will submerge beneath another plate;
- A convergent boundary is formed at the site of the collision;
The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.
hi :) why do ionic compounds conduct electricity in aqueous solution? I’m afraid it’ll be tested as I’m not sure how to explain :/ anyone able to help ? Thank you!!
Explanation:
Ionic compounds do conduct electricity in aqueous or molten state but not in solid state. In solid state the ions are held together and they cannot move, so cannot conduct electricity. In molten or aqueous form the lattice breaks and ions are free to move so can conduct electricity.
I know this is so late. But anyone who comes across this type of a question, I hope this is helpful.
What kind of reaction is 2C2H6 + 702(g) → 4CO2+ 6H20?
Answer: Combustion Reaction
Which state of matter is characterized by ionized particles, no definite shape or volume, and good electrical conductivity? gas liquid plasma solid
Answer: Plasma
Explanation: Plasma is the state of matter where the substance is ionized and has no definite shape or volumen. The fact of being ionized makes the substance a good electrical conductor.
Hope it helps.
Matter generally exists in three physical states, namely solid, liquid and gaseous states. The three states mainly differ in the arrangement of particles and the force of attraction among the constituent particles. Here plasma is characterized by ionized particles. The correct option is C.
What is plasma?Plasma is a hot ionized gas which contains equal numbers of positively and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that it is considered as the fourth state of matter.
Since plasma are made up of electrically charged particles, they are strongly influenced by electric and magnetic fields while neutral gases are not. Like gases plasmas have no fixed shape or volume and are less dense than solids or liquids.
Plasma is a superheated matter, so hot that the electrons are ripped away from the atoms forming ionized gas. It comprises over 99% of the visible universe.
Thus the correct option is C.
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Scientific evidence shows that Earth's diameter, and thus overall size, does
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
O c. Contracting Earth
D. Continental drift
U
SUBMIT
Answer:
The evidence goes against A. Expanding Earth and B. Contracting Earth
What type of property is specific heat ?
Answer:
Specific heat is a physicle property.
Explanation:
Hello! :)
________ ☆ ☆__________________________
Answer:
physical property....
Explanation:
Here is a example of specific heat... WATER.
I attached a picture if you still didn’t understand.
So the answer would be....
ANSWER:PHYSICAL PROPERTY
Hope this helps! :)
__________ ☆ ☆_________________________
By, BrainlyMember ^-^
Good luck!
can anyone answer this because i’m kind of confused!!
You have the correct answer. It is choice D. Increasing the reactants will mean there is more matter to collide with one another to form chemical bonds. The more matter that collides, the faster the reaction rate.
Which statement about acids is true?
a) Weak acids have a pH of less than 2.
b) The pH value of acids can only be measured in aqueous form.
c) The stronger the acid, the higher the pH value.
d) Strong acids have a low percent ionization.
Answer:
weak acids have a pH of less than 2
Which one has a greatest mass, one atom of carbon, one atom of hydrogen, or one atom of litium
Calculate the number of moles in each of the following:
a. 82.0 g of Ag
b. 0.288 g of C
c. 15.0 g of ammonia, NH3 d. 7.25 g of CH4
e. 245 g of Fe2O3

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem
Explanation:
In the reaction Ca + Cl2 → CaCl2, what is the mole ratio of chlorine to calcium chloride?
Select one:
O a. 2:3
O b. 2:1
O c. 1:2
O d. 1:1
PLEASE HELP ME
Answer:
D. 1:1
Explanation:
For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).
So, the mole ratio of chlorine to calcium chloride is 1:1.
Hope this helps. :)
The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.
What is the stoichiometry?Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.
Given chemical reaction is:
Ca + Cl₂ → CaCl₂
From the stoichiometry of the given reaction it is clear that,
1 mole of chlorine = reacts with 1 mole of calcium chloride
So, mole ratio = Chlorine / calcium chloride = 1:1
Hence required mole ratio is 1:1.
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please help me fast
When iron rusts in air, iron(III) oxide is produced. How many moles of oxygen react with 80.9 mol of iron in the
rusting reaction?
4Fe(s) + 302(g) → 2Fe2O3(s)
Select one:
O a. 60.7
O b. 108
O c. 80.9
O d. 121
Answer:
60.7 mole
Explanation:
for every 4 moles of iron 3 moles of oxygen is used.
So, moles of oxygen = [tex]\frac{3 * 80.9}{4}[/tex] = 60.675
Ionic compounds dissolved in water are better conductors of electricity than when they are in solid form. Why is this true?
Answer: In their bonded, solid states, molecules like salt don't conduct electricity. But when they're dissociated in a solution or through melting, they can carry a current. This is because electrons can't move freely through water (in the same way they do in a conductive wire), but ions can move freely
Explanation: