Answer:
69.4
Explanation:
There isn't one, I just took the test.
Argon atom can exist freely in nature, why
Answer:
Argon can exist freely in nature because it has a full octet of electrons the way its found in the nature is the same way its found in periodic table of element in vast amouts of stabilization.
Iron is extracted from its ore (hematite) in the blast furnace. Which gas is produced as a waste product?
Answer:
CO2
Explanation:
CO2 or carbon dioxide is produced when iron is extracted from its ore. Carbon monoxide Co is used as reducing agent in iron extraction. In this reaction iron ore is reduced to iron and CO is oxidized to CO2 or carbon dioxide which is released in the process. There extraction of iron is redox reaction.
sound travels slower in colder air than it does in warmer air why does the speed of sound depend on air temperature
Answer:
Explanation:
The speed of sound in the air mainly depends on temperature. At high altitudes, where it is much colder, sound travels slower. The higher the temperature, the faster the air molecules are moving to begin with, and the quicker they bump into each other as a sound wave passes through.
Answer:
Air molecules have more energy at higher temperature which means they vibrate faster
Water forms according to the equation below: 2H2(g) + O2(g) 2H2O(g) Hrxn = -483.64 kJ How much energy is released during the formation of 1 mol H2O(g)?
Answer:
Hrxn = -241.82 kJ
Explanation:
2H2(g) + O2(g) --> 2H2O(g) Hrxn = -483.64 kJ ............. (i)
The equation for formation of 1 mol of H2O is given as;
H2(g) + 1/2O2(g) --> H2O(g) ................. (ii)
Eqn (ii) is obtained by dividing eqn (i) by 2
That means the heat of reaction for eqn (ii) is given as;
Hrxn = -483.64 kJ / 2
Hrxn = -241.82 kJ
Answer:-241.82 kJ
Explanation:
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Kindly Help Please!
Can you write the symbol equations for each of the reactions below:
and Can you balance them?
1) Ethane + Oxygen = Carbon Dioxide + Water
2) Butane + Oxygen = Carbon Dioxide + Water
3) Octane + Oxygen = Carbon Dioxide + water
4) Decane + Oxygen = Carbon Dioxide + Water
thank you!
Answer: 1) [tex]2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O[/tex]
2) [tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]
3) [tex]2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O[/tex]
4)[tex]2C_{10}H_{22}+31O_2\rightarrow 20CO_2+22H_2O[/tex]
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side.
The balanced chemical reactions will be:
1) Ethane + Oxygen = Carbon Dioxide + Water : [tex]2C_2H_6+7O_2\rightarrow 4CO_2+6H_2O[/tex]
2) Butane + Oxygen = Carbon Dioxide + Water : [tex]2C_4H_{10}+13O_2\rightarrow 8CO_2+10H_2O[/tex]
3) Octane + Oxygen = Carbon Dioxide + water: [tex]2C_8H_{18}+25O_2\rightarrow 16CO_2+18H_2O[/tex]
4) Decane + Oxygen = Carbon Dioxide + Water : [tex]2C_{10}H_{22}+31O_2\rightarrow 20CO_2+22H_2O[/tex]
I need help someone plz
Answer:It has 8grams of hydrgen
Explanation:
Which of the following factors is the most in-
fluential in the formation of soil?
Fe2O3(s) + 3CO(g) → 3CO2(g) + 2Fe(s)
If 6 moles of CO reacted with excess Fe2O3, then how many moles of Fe were produced?
Answer:
4 moles Fe(s)
Explanation:
Fe₂O₃(s) + 3CO(g) → 3CO₂(g) + 2Fe(s)
Reaction shows a 3:2 ratio between CO(g) & Fe(s) ...
∴moles of Fe(s) produced = 2/3(6) moles Fe(s) produced = 4 moles Fe(s)
Red is dominant to white for flower color in a particular plant. If a red flowered plant (RR) is crossed with a white flowered plant (rr), what color will the offspring be?
Answer:
The offspring will all have red-colored flowers
Explanation:
A dominant character is one that is always expressed when it is present.
A recessive character or trait is one that is only expressed in the absence of the dominant character. Thus, when the dominant and recessive character are both present in an organism, the recessive character will be hidden while the dominant character will be expressed.
According to Menedel's laws of inheritance, in the cross between the dominant (RR) red-flowered plant and the recessive (rr) white-flowered plant, the genotype of the offspring will be as follows:
RR x rr = Rr, Rr, Rr,Rr
The offspring are all heterozygous for flower color. However, since red flower color is dominant over white flower color, all the offspring produced will have red-colored flowers.
(e) Another student investigated the rate of a different reaction
Table 3 shows the results from the different reaction
Headings that you a
will appear here.
Table 3
Mass lost when the reaction was
complete
9.85 g
Time taken to complete the reaction
2 minutes 30
seconds
Calculate the mean rate of the reaction using Table 3 and the equation:
mass lost in g
mean rate of reaction time taken in s
Give your answer to two decimal places.
Answer:
0.07 g/s.
Explanation:
From the question given above, the following data were obtained:
Mass lost = 9.85 g
Time taken = 2 min 30 s
Mean rate =?
Next, we shall convert 2 min 30 s to seconds (s). This can be obtained as follow:
1 min = 60 s
Thus,
2 min = 2 × 60 = 120 s
Therefore,
2 min 30 s = 120 s + 30 s = 150 s
Finally, we shall determine the mean rate of the reaction. This can be obtained as illustrated below:
Mass lost = 9.85 g
Time taken = 150 s
Mean rate =?
Mean rate = mass lost / time taken
Mean rate = 9.85 / 150
Mean rate = 0.07 g/s
Therefore, the mean rate of the reaction is 0.07 g/s
how many moles of MgO can be made from 10 moles of fe2O3?
Answer:
Fe 2 O3 .
Explanation:
How is a compound different from a mixture?
A. Mixtures are created through physical changes; compounds are created through chemical reactions.
B. Compounds are created through physical changes; mixtures are created through chemical reactions.
C. Mixtures, on average, are heavier than compounds.
D. Compounds, on average, are heavier than mixtures.
What are chemical formulaes?
give your own response!!
Answer:
is a way of presenting information about the chemical proportions of atoms
Explanation:
The diagram shows the different models of the atom that eventually led to the modern atomic theory.
Which model was proposed as a result of Rutherford's scattering experiment where positive particles did not pass straight through a foil as expected? (5 points)
Model A
Model B
Model C
Model D
Answer:
B.
Explanation:
The atomic model represents the position of the sub-atomic particles. Model A was proposed after Rutherford's scattering experiment where the positive particles were deflected in the middle. Thus, option A is correct.
What was Rutherford's atomic model?Rutherford's atomic model proposed the presence of the positive nucleus in the middle of the atom while the electrons surrounded them in their orbitals with a negative charge.
He performed the scattering experiment where alpha particles emitted by the radioactive element were used to locate the positions of the electrons, neutrons, and protons.
According to the experiment, model A, best fits as the nucleus made of protons and neutrons takes the center of the atom with negative electrons surrounding them. The nucleus is small as compared to the entire atom.
Therefore, option A. model A best proposes Rutherford's model.
Learn more about Rutherford's model here:
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Difference girteen tungsten and nichrome
Answer:Tungsten is made of tungsten while Nichrome is made of nickel chromium. ... Tungsten is used to make filament of bulbs. Nichrome have high resistivity than tungsten.
Explanation:i hope u have a wonderful night and stay safe
What is the molarity of NaOH if 300.mL of
5.00M HCl is titrated with 200.mL of NaOH?
which basic postulates of Dalton's atomic theory are modified by the modern atomic theory
Answer:
Dalton's atomic theory has been modified as
Explanation:
Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes
Answer:
On the basis of new experimental facts, Dalton's atomic theory has been modified as: ... Atoms of same element may not have same atomic mass. For example, some atoms of chlorine have atomic mass 35 amu while others have atomic mass 37 amu. Such atoms of same element having different atomic masses are called isotopes.
Explanation:
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(HELP ASAP) what is the reaction for Si + S₈ --> Si₂S₄
Answer:
Synthesis reaction~~~~~~~
Explanation:
How do you write 0.00001 in scientific notation?
Answer:
1×10^-5
hope it helps you
Answer:
According to the text
"Move the decimal 5 times to right in the number so that the resulting number, m = 1, is greater than or equal to 1 but less than 10.
Since we moved the decimal to the right the exponent n is negative. n = -5.
Write in the scientific notation form, m × 10n = 1 × 10-5""
Explanation:
What is the van't hoff factor of C7H7NO?
Answer:
i = 1
Explanation:
Van't Hoff factor (i) is explained as the number of ions dissolved in solution.
It is needed to determine colligative properties which depend on the amount of solute.
C₇H₇NO is an organic compound → benzamide
All the organic compound have 1, as Van't Hoff factor.
In order to predict i, you consider ionic salts. For example:
AlCl₃
CaCl₂
NH₄NO₃
When you dissociate them, you determine i:
AlCl₃ → Al³⁺ + 3Cl⁻ i =4
CaCl₂ → Ca²⁺ + 2Cl⁻ i = 3
NH₄NO₃ → NH₄⁺ + NO₃⁻ i =2
The van't Hoff's factor of C₇H₇NO is 1
Van't Hoff factorThe Van't Hoff factor denoted with the symbol i is the number of ions dissolved in solution.
Non electrolyte (such as organic compounds) generally have van't Hoff's factor as 1The Van't Hoff's factor for ionic compounds varies with the number of ions in the solution. How to determine the Van't Hoff's factor for C₇H₇NOC₇H₇NO (benzamide) is an organic compound and as such, it have a Van't Hoff's factor of 1
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how many grams are there in 5 moles of CO2
220 grams are there in 5 moles of CO₂.
What is mole?Mole is defined as the mass of a system whose elementary constituents total the number of atoms in 0.012 kilograms of carbon 12. Any material has a molecular weight of 6.023 x 10²³. It can be used to quantify the results of a chemical reaction. The term "Molarity" is derived from the unit of measurement called a mole, which is used to describe chemical substances.
To get an object's mass, divide its weight by the acceleration of gravity.
As we know that mass of CO₂ is 44 gram.
The mass in grams of one mole of any chemical is known as its molar mass.
Number of moles = Mass of substance / Mass of one mole.
1 mole = 44 gram of CO₂
So 5 mole = 44 gram x 5
= 220 gram of CO₂
Thus, 220 grams are there in 5 moles of CO₂.
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HELP PLEASE || TEN PTS WILL MARK BRAINLEST ||Reaction B could produce a substance with a pH of...
Group of answer choices
4.
14.
10.
7.
Answer:
the answer is 4
Explanation:
i took the test and got it right and i would recommend using quizlet it has these flash cards and the answers are there you just click on the one that says your question and it will say your answer on the back. It helps with most of my test! Hope this helps (:
Consider the reaction Mg₂Si(s) + 4 H₂O(ℓ) → 2 Mg(OH)₂(aq) + SiH₄(g). How many grams of silane gas (SiH₄) are formed if 25.0 g of Mg₂Si reacts with excess H₂O?
Answer:
10.60 grams of silane gas are formed.
Explanation:
From the reaction:
Mg₂Si(s) + 4H₂O(l) → 2Mg(OH)₂(aq) + SiH₄(g)
We know that the limiting reactant is Mg₂Si, so to find the mass of SiH₄ formed we need to calculate the number of moles of Mg₂Si:
[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}}[/tex]
Where:
m: is the mass of Mg₂Si = 25.0 g
M: is the molar mass of Mg₂Si = 76.69 g/mol
[tex]\eta_{Mg_{2}Si} = \frac{m_{Mg_{2}Si}}{M_{Mg_{2}Si}} = \frac{25.0 g}{76.69 g/mol} = 0.33 moles[/tex]
Now, the stoichiometric relation between Mg₂Si and SiH₄ is 1:1 so:
[tex] \eta_{Mg_{2}Si} = \eta_{SiH_{4}} = 0.33 moles [/tex]
Finally, the mass of SiH₄ is:
[tex] m_{SiH_{4}} = \eta_{SiH_{4}}*M_{SiH_{4}} = 0.33 moles*32.12 g/mol = 10.60 g [/tex]
Therefore, 10.60 grams of silane gas are formed.
I hope it helps you!
How many atoms are in 5.31 mol of Iron?
Answer:
3.77 moles of Fe contain 2.27 × 10, 24 as an exponent
Need quick! Please help rn! THANK YOU!
Answer:
B. Unbalanced force
Explanation:
Answer:
I think its unbalanced force
Explanation:
crazy what a quick go.ogle search can do! :)
Two or more substances combined but not chemically, are called what?
Answer:
a mixture
Explanation:
Two or more substances combined chemically, are called a compound
Please! I need this quick! THANK YOU!!
Answer:
Force
Explanation:
The force is applied to either pushing or pulling forwarding momentum and movement.
Answer:
A: Force
It is a push/pull that changes the motion of an object
A volume of 20.0L of oxygen is warmed from -30.0C to SATP condition. What is the new volume if the pressure is kept constant
Between which two stages does cell division (cells divide or multiple) first occur?
Captionless Image
a. A and B
b. B and C
c. C and D
d. D and E
Clear selection
Answer: C and D
Explanation:
Arrange the following formulas in increasing percentage of nitrogen. Show a NEAT solution.
a) NH4NO3
b) CO(NH2)2
c) NH3
Answer:
c) NH3Explanation:
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