The unbalanced equation below shows the combustion of methane.
CH4 +02 —CO2 + H2O
Which series of numbers represents the coefficients necessary to balance the equation?
A-1, 1, 1, 2
B-1, 2, 1, 2
C-2, 2, 1, 4
D-0, 3, 2, 2
The series of numbers 1, 2, 1, 2 represents the coefficients necessary to balance the equation of combustion of methane. Therefore, option (B) is correct.
What is the combustion reaction?A combustion reaction can be described as a reaction that produces fire and takes place at an elevated temperature. A combustion reaction is an exothermic, redox reaction that occurs between a fuel and mostly oxygen in the atmosphere.
Oxygen is the most important part of the combustion reaction because combustion never happens in the absence of oxygen. Complete combustion is the one where a fuel burns entirely to produce carbon dioxide and heat with oxygen.
The combustion of methane reacts with two moles of oxygen gas to give two moles of water and carbon dioxide.
CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)
Therefore, the series of numbers of coefficients is 1, 2, 1, 2.
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Be sure to answer all parts. How many moles of O are needed to combine with 0.276 mole of C to form CO
Answer:
0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.
Explanation:
Given data:
Moles of oxygen needed = ?
Moles of carbon present = 0.276 mol
Solution:
Chemical equation:
2C + O₂ → 2CO
Now we will compare the moles of carbon with oxygen.
C : O₂
2 : 1
0.276 : 1/2×0.276 = 0.138 mol
Thus, 0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.
Explain why HCl can be a strong electrolyte, but a dilute HCl solution can be a poor conductor?
Answer:
Because as the concentration is diminished, the capacity to transfer electricity is diminished as well.
Explanation:
Hello!
In this case, since electrolytes are substances that are able to conduct the electricity in aqueous media (solutions in which water is the the solvent) because they have the capacity to form ions with both positive and negative charges, due to the fact that HCl is a strong acid, we notice it is fully ionized in solution and therefore it is a strong electrolyte. However, when the concentration is diminished, we can notice that strength is diminished as well because less ions will have the capacity to transfer the electricity and therefore it'd become a poor conductor or weak electrolyte.
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A sample is found to contain 2.98x10^-10 g of salt. Express this quantity in nanograms.
This quantity = 0.298 nanograms(ng)
Further explanationMass is one of the principal quantities, which is related to the matter in the object
The main mass unit consists of 7 units of other than other units of mass such as quintals, tons, pounds, ounces:
Kilogram, kg
Hectogram, hg
Decagram, dag
gram, g
Desigram, with
centigram, cg
milligram, mg
Each unit descends then multiplied by 10, and if one unit increases then divided by 10
Conversion of other mass units:
10⁻³ g ⇒mg-milligrams
10³ g ⇒kg-kilograms
10⁻⁶ g ⇒µg-micrograms (mcg)
10⁶ g ⇒Mg-megagrams (tons)
10⁻⁹ g ⇒ng-nanograms
10⁹ g ⇒Gg-gigagram
10⁻¹² g ⇒pg-pikogram
2.98 x 10⁻¹⁰ g to nanograms(ng)
[tex]\tt 2.98\times 10^{-10}\times 10^9=0.298~ng[/tex]
This chemical equation represents a chemical reaction.
HCl + NaOH - NaCl + H20
Which two chemicals are products in the chemical reaction?
A. NaOH
B. H20
C. NaCl
D. HCI
Explanation:
products are Nacl + H20
________________naturally helps cold-blooded animals warm up so that they can function.
Question 5 options:
Radiation
Convection
Warm Water
Heating pad
Answer:
Warm Water
Explanation:
In warm temperatures, cold-blooded animals are more active and can travel more quickly. This occurs because heat activated reactions provide energy to move muscles. In the absence of heat the animal becomes slow and sluggish. So they are usually inactive and rest when it is cold. As they do not need to feed much, they spend less time looking for food, so this life strategy works for them.
Brainliest?
Answer warm water Explanation:i have the same question
Which property of a sound wave increases as the pitch of the sound
increases?
A. Amplitude
B. Wavelength
C. Rest position
ОО
D. Frequency
Answer:
the answer is d. frequency
state Graham's law diffusion of gas mathematical expression ?
Answer:
Graham's law states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight
Explanation:
Models can have the same
general appearance as real-ufe
objects.
True or false
Answer:
true
Explanation:
Answer:
True
Explanation:
Because its true
Describe how this instrument works.
Operation:
Answer:
Microscope
Explanation:
Answer:
its a telescope you see stars or plants
Explanation:
At a constant temperature, which of the gases will have the highest average
kinetic energy?
A) H2
B) N2
C) O2
D) F2
E) All the gases will have the same average
kinetic energy.
H₂ will have the highest average kinetic energy
Further explanationEnergy because this motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex]\tt \displaystyle KE=\frac{1}{2}mv^2[/tex]
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large{\boxed{\bold{v_{rms}=\sqrt{\frac{3RT}{Mm} } }}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the two equations above, it can be concluded
KE is directly proportional to gas velocity Gas velocity is inversely proportional to molar massSo the highest KE is owned by the gas with the smallest molar mass
Molar mass of the gas :
A) H₂ : 2 g/mol
B) N₂ : 28 g/mol
C) O₂ : 32 g/mol
D) F₂ : 38 g/mol
So H₂ has the highest average kinetic energy
At a constant temperature: E. All the gases will have the same average kinetic energy.
According to the kinetic-molecular theory, the average kinetic energy of gas molecules (particles) is highly dependent on temperature.
Hence, the average kinetic energy of gas molecules (particles) is directly proportional to the absolute temperature of the gas.
At a constant temperature, all gases would have the same average kinetic energy according to the kinetic-molecular theory of gases.
In conclusion, all the gases would have the same average kinetic energy since the temperature is constant.
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Dominant alleles uses
A.
Lower case alleles
B.
upper case alleles
C.
Upper and lower case alleles
D.
It doesn’t matter
Answer: Upper Case Alleles
Explanation: Lower case alleles are recessive
5. How many moles of aluminum sulfate would contain 3.54 x 1025 sulfur atoms?
Answer:
19.6 moles of aluminum sulfate
Explanation:
Given parameters:
Number of sulfur atoms = 3.54 x 10²⁵ atoms
Unknown:
Number of moles of aluminum sulfate = ?
Solution:
Aluminum sulfate is expressed as;
Al₂(SO₄)₃
1 mole of Aluminum sulfate contains 3 moles of sulfur.
6.02 x 10²³ atoms are found in 1 mole of any substance;
3.54 x 10²⁵ sulfur atoms will be found in [tex]\frac{3.54 x 10^{25} }{6.02 x 10^{23} }[/tex] = 58.8moles of sulfur
1 mole of Aluminum sulfate contains 3 moles of sulfur.
or ;
3 moles of sulfur is contained in 1 mole of aluminum sulfate
58.8moles of sulfur will contain [tex]\frac{58.8}{3}[/tex] moles of aluminum sulfate
= 19.6 moles of aluminum sulfate
BRAINILY ANSWER NOW OLEASE I NEED HELP
explain why the Sun appears to move across the sky throughout the day.
Answer:
From Earth, the Sun looks like it moves across the sky in the daytime and appears to disappear at night. This is because the Earth is spinning towards the east. The Earth spins about its axis, an imaginary line that runs through the middle of the Earth between the North and South poles.
Explanation:
Answer:
The Earth rotates on its axis always, so it looks like the sun is moving but it is the Earth that's moving.
Explanation:
Hope this helps!
How many electrons are in the outermost shell of the K+ ion in its ground state?
Answer:
If we look at the electron configuration of potassium (K), we see that it has one electron: [Ar]4s1. Obviously, removing that electron gives us [Ar] (same configuration as K1+), which is a noble gas and has 8 electrons. Valence electrons are generally regarded as being 'the outermost electrons' for a given atom
There is a structure of CH3CH2CHCHCH2CH3, with a –CH2CH3 group attached to the third and fourth carbons.
Spell out the full name of this compound
Explanation:
2,3-diethyl hexane
At first we select a long chain.
Then, we number that chain from that side where substituent position is closer.
Then, we write it's IUPAC name
Position of substituent + substituent name + chain name + suffix
Here,
2,3 + -diethyl + hex + -ane
= 2,3-diethyl hexane
What happens to the stability of atoms when they form covalent bonds?
Answer
The two types of chemical bonds that atoms can form to achieve stability are called ionic bonds and covalent bonds. In ionic bonds, atoms donate or receive electrons to achieve stability. In covalent bonds, atoms share electrons to achieve stability.
Which of these is a compound
A) O
B)CO2
C)O2
D)Co
Answer:B. CO2
Explanation: It is B because it has both letters capitalized if it is a compound and it only has 1 letter capitalized if it is an element.
Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in
the compound.
.Ca.
.P.
A. 1:1
B. 3:2
C. 2:1
D. 3:1
12. Calculate the molecular weight.
a. Sodium Chloride (NaCl)
b. Magnesium sulphate (MgSo.)
True or False
1. Magma with a high silica content will be less viscous, therefore be more fluid.
2. An increase of one on the Richter scale corresponds to a tenfold increase in the amplitude of body wave
3. Magma is found on the surface, lava is beneath the surface.
Answer:
Explanation:
1.false
2.true
2.true
Magma that contains high silica content will have higher viscosity. This is because they exhibit greater rate of polymerization unlike magma with less silica content
Therefore the number 1 statement is false.
A Richter scale is a device that is used to calculate an earthquakes size from the amplitude of the largest wave recorded by a seismograph.
One unit on the scale represents a 10-fold increase in the magnitude of an earthquake.
Therefore the number 2 statement is true.
Magma is a liquid rock found under the earth which can find its way to the surface of the earth through cracks and holes.
When magma finds its way to the surface of the earth it is called lava.
Therefore statement 3 is false.
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What happens to a Lithium atom for it to become an Li+1 ion?
Answer:
If an atom gains or loses an electron, it bacomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
Explanation:
A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion. It now has more positive protons than electrons so it has an overall positive charge. Therefore it is a positive ion.
A fluorine atom will tend to gain, rather than lose, an electron. By gaining a negative electron, it has an overall negative charge. It has become a negative ion.
15
4
(3.2)
52
2
1 2 3 4 5
(4) OX
Z
(2.-25
3
5
Based on the graph, the coordinates for Do. 1 of X are:
O (4,0)
O (5, 1)
O (3.-1)
what do y'all girls find attractive on a guy?
Answer:
alot of things
Explanation:
What are the two processes of ocean to cloud?
Answer: The excess amount changes from a gas into a liquid or solid (ice). The process of water changing from a gas to a liquid is called "condensation," and when gas changes directly into a solid, it is called "deposition." These two processes are how clouds form.
how many elements are present No and NO
The correct chemical formula for aluminum (Al+3) plus chlorine (Cl-1) is what.
Answer:
AlCl₃
General Formulas and Concepts:
Elemental ChargesReading a Periodic TableExplanation:
Step 1: Define
Al³⁺ and Cl¹⁻
Step 2: RxN
Al³⁺ (s) + Cl¹⁻ (g) → AlCl₃
Need to have the same amount of charge (should add to 0)We need 3 Cl's to balance the positive 3+ charge3(-1) for Cl + 1(3+) for Al = 0Answer:
The answer is: AlCl₃
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Explanation:
Why are there more fossils of marine organism than of land organisms o dc
Answer:
Three primary reasons. First, there is simply more water-covered places than dry ground places for the animals and plants to have lived. Second, the seas are much more crowded with the kinds of life that leave fossils than the land is. Third, the process that form fossils work very well under water.
Explanation:
What is I2O8 compound name?
Answer:
Formula in Hill system is I2O8. Computing molar mass (molar weight). To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use: Any chemical element.
Explanation:
20 POINTS!!
1. 14.07g of solid sucrose (C12H22O11) are dissolved in 0.35 L of water. What is the molarity of the solution?
2. What is the molarity of a sucrose solution with a concentration of 4.5 ppm (mg/L)?
3. What is the molarity of the same sucrose solution if you dilute 40 mL of it into a 500 mL volumetric flask?
Answer:
1. molarity is = 0.1174
2. molarity is = 9.3
3. molarity is =0.009392
Explanation:
Q#1.
mass of sucrose is 14.07g
molar mass of sucrose is 342 3g/mol
so, 14.07x1/342.3 = 0.0411
now the volume is of water is 0.35
so, 0.0411/0.35 = 0.1174
Q#2.
concentration is 4.5
so, 4.5x1/1000= 0.0045
then, 0.0411/0.0045 = 9.13
Q#3.
M1M1=M2M2
molarity of the same sucrose is 0.1174
so, diluted in 40mL
and the volumetric flask is 500mL
so, 0.1174x40/500= 0.009392
