Combustion of propane is the exothermic reaction
Combustion reactions are reactions in which a substance reacts with an excess of air or oxygen to form products. the combustion of hydrocarbons in the presence of stoichiometric or excess levels of oxygen forms carbon dioxide and water and with the release of heat the molecular formula of propane is C₃H₈. one mole of propane needs five moles of oxygen for complete oxidation to form carbon dioxide and water.
The balanced equation for combustion of propane is:
C₃H₈(g) + 5O₂(g)→3CO₂(g)+4H₂O(g)
The products are 3 moles of CO₂ and 4 moles of H₂O for every mole of the alkane burnt completely. propane combust completely
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In pasteur’s experiment, what would have happened if pasteur had broken off the swan neck of the flask one week after boiling the nutrient broth to sterilize the flask?.
Cells from the air would have fallen into the sterilized growth medium in the flask and grown there if Pasteur had broken off the swan neck of the flask one week after boiling the nutrient broth to sterilize the flask.
Who was Pasteur?He was referred to as a microbiologist who was responsible for many advances in science through experiments and an example is the one which was done using broth.
He heated the flask after it was sealed to kill microbes present in it and the result was nothing grew in the sample. However, if he had broken off the swan neck of the flask one week after boiling, cells from the air would have fallen into the sterilized growth medium in the flask and grown there.
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The sun, like 80 to 90 percent of stars, is in which stage of life?(1 point) responses dying star dying star main sequence main sequence stellar formation stellar formation red giant red giant
Answer:
main sequence
Explanation:
now nae nae
The sun, like 80 to 90 percent of stars, is in main sequence stage of life.
The main sequence stars fuse hydrogen atoms to form helium atoms in their cores.
The main sequence is a band of stars that appears on plots of the Hertzsprung–Russell diagram
The Hertzsprung–Russell diagram puts each star on a graph according the star's brightness against its temperature.
About 90 percent of the stars in the universe are main sequence stars.
Nuclear reaction is in the inner core of the Sun and hydrogen is conveted into helium.
The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.
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histamine, a vasodilator, is responsible for a wide variety of physiological effects. rank the three nitrogen atoms in histamine in increasing order of basicity, putting least basic nitrogen atom first.
The increasing order of basicity, putting least basic nitrogen atom first are as follow:
N2 < N1 < N3.
The basicity of the atom is inversely proportional to the resonance.
What is resonance?Resonance is also termed as mesomerism, is defined as a way of telling the bonding in certain polyatomic ions or molecules by the combination of varies contributing structures into the resonance hybrid in the valence bond theory.
Since, in N2 due to the presence of lone pair of electron and it not even donate these lone pair of electron. On the other hand they take part in resonance, therefore the basicity of the N2 is least.
In N3 the lone pair of electron is present and it able to donate these lone pair of electron to the sp3 hybridization, therefore the basicity of the N3 is more than N2.
Thus, we concluded that increasing order of basicity, putting least basic nitrogen atom first are N2 < N1 < N3.
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From the options provided for each element below, choose the properties that it may have based on its location in the periodic tableNeon (Ne):
shiny
a conductor
a gas
From the options provided for the element, a gas is a property that neon may have based on its location in the periodic table.
Neon is an inert gas. The elements of group 8 A are the inert gases. They are - Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe) and Radon (Rn). Inert gases are stable and they are not reactive chemically.. Inert gases are also called as noble gases.
Neon element is a gas which cannot be shiny or dull. It is clear and colorless. So, it cannot have this property.
Neon element is an inert gas. They have complete valence shells and do not have any free electrons. Therefore, they are poor conductors of electricity.
Neon element belongs to the group 8, which is inert gas. Therefore, it has property of gas.
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calculate the mass of iron(iii) oxide fe2o3 that contains a billion ×1.00109 iron atoms. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
The mass of Fe2O3 is 8.839 x 10^-14 g
The first step is to determine the number of moles of Iron (III) Oxide that contains a billion O atoms.
1 x 10^9 O atoms*1 mol O/6.022 x 10^23 atoms*1 mol Fe2O3/3 mol O = 5.535 x 10^-16 mol Fe2O3
By using the molar mass of Iron (III) Oxide, we arrive with the mass in grams that contains a billion O atoms.
5.535 x 10^-16 mol Fe2O3*159.69 gram/1 mol Fe2O3
= 8.839 x 10^-14 g Fe2O3
Hence, mass of Fe2O3 is 8.839 x 10^-14 g
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A chemistry experiment calls for 5 grams of baking soda. your measuring spoon holds 5000 mg of powder. how many will you need for the experiment?
Answer: 1 spoon
Explanation:
Amount needed= 5 grams or 5000 mg
The spoon holds 5000 gm
So, One spoon of baking soda is needed for the experiment.
what substance is lost from the leaves of a daffodil plans to make them turn yellow ?
Answer:
Daffodil leaves always turn yellow a few weeks after the plant blooms. This is normal and indicates that their job is finished for the season. The leaves have absorbed sunlight, which creates energy for the production of sugar that replenishes the bulb for the coming growing season.
Explanation:
why do some elements have parentheses around the atomic mass what do these parentheses indicate about the elements
Some element have parentheses around atomic mass because it form subgroup of atom within a molecule. the number in parentheses is the mass no of most stable isotopes of that element
Parentheses means in a particular structure are repeated in molecule called parentheses. parentheses is used because to help identity that there is more than one polyatomic ion present. parentheses are useless in chemical formula if they don't have a subscript.
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What do plant cells make in the process of photosynthesis?
types of boiling and give two examples
Answer:
nucleate boiling where small bubbles of vapour form at discrete points, and critical heat flux boiling where the boiling surface is heated above a certain critical temperature and a film of vapor forms on the surface.
Explanation:
hope this helps :3
Answer:mark pls
Explanation:
Element X has a half life of 6 days. If you start with 50 kg of element X,
how much would be left after 24 days?
After 24 days, you will have 1/2 kg
It's a common occurrence for radioactive isotopes to spontaneously decay over time, shedding their radioactive atoms. The period of time it takes for any sample of an element to be reduced to half its initial amount is known as the half-life of a radioactive isotope. The differential equation
dNdt=kN(t)
describes the decay of such radioactive isotopes, where N(t) is the number of radioactive atoms of the element that are still present at time t and k is the decay constant.
The solution to the aforementioned differential equation is N(t) = N (0)ekt, where N (0) is the initial sample's initial number of atoms.
Keep in mind that the natural logarithm has the identity
a ln n=a ln n.
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I need help please. I need 1-5
Answer:
EBADCExplanation:
P.S - Get a good lighting when taking the pictures because you kinda gave me a hard time reading the questions. Thank you.
How many seconds are in 32 years with dimensional analysis
Answer:
There are 1.0 * 10^9 seconds in 32 years.
Explanation:
To solve this problem, we will use dimensional analysis, or multiplying by fractions equivalent to 1.
We are starting with a value in years. Since we know that there are 365 days in 1 year, we can multiply the given value (in years) by 365 days/1 year to cancel out the units of years and convert to days:
32 years * 365 days/1 year = 11,680 days
Next, we can use the same idea to convert from days to hours:
11,680 days * 24 hours/1 day = 280,320 hours
And then again for hours to minutes and minutes to seconds:
280,320 hours * 60 minutes/1 hour * 60 seconds/1 minute
= 1009152000 seconds
This answer is quite large, so we will convert to scientific notation to make the value more manageable.
1009152000 seconds = 1.0 * 10^9 seconds
Therefore your answer is 1.0 * 10^9 seconds.
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9. High biodiversity is a sign of a healthy ecosystem. There should be a
sufficient number of producers, consumers, and decomposers to have a
balance in the ecosystem.
O True
O False
True, there should be a balance maintained between consumers, producers and Decomposers. An increase or decrease in either of them would lead to an imbalance in the ecosystem.
Answer:false
Explanation:
If the pk values for phosphoric acid are 2. 15, 6. 82 and 12. 38, at what ph would one observe equal amounts of h2po4- and hpo42-?
Answer: https://homework.study.com/explanation/if-the-pk-a-values-for-phosphoric-acid-are-2-15-6-82-and-12-38-at-what-ph-would-one-observe-equal-amounts-of-h-2-po-4-and-hpo-4-2.html
Explanation:
website to the answer lol
Using the periodic table above and your knowledge of patterns and trends on the table, which of the following elements is the most reactive? (1 pt)
*
1 point
Titanium (Ti, #22)
Silicon (Si, #14)
Oxygen (O, #8)
Argon (Ar, #18)
7) K₂CO3
# of molecules:
# of elements:
Name of element:
Total # of atoms:
The #3 is a
# of atoms:
(coefficient or subscript)
K₂CO₃ has three element and name of element is potassium, carbon, oxygen and total number of atom is six and the three atom is of oxygen
K₂CO₃ is an inorganic compound with chemical name potassium carbonate and it is also called carbonate of potash, or dipotassium carbonate or Pearl ash and it is a dipotassium salt of carbonic acid and it is widely used in the production of glass and soap
Here given compound is K₂CO₃ which has three element and name of element is potassium, carbon, oxygen and total number of atom is six means 2 potassium one carbon and three oxygen atom and the three atom is of oxygen and subscript and coefficient means number of element which is present in the compound
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a 4.37-g sample of a certain diatomic gas occupies a volume of 3.00 l at 1.00 atm and a temperature of 45°c. identify this gas.
The diatomic gas is Fluorine
Given:
mass of diatomic gas = 4.37-g
volume of diatomic gas = 3 l
temperature = 45°c = 318 K
R in Lt-atm scale 0.08205736(14) L-atm/K-mol
~ 0.082
To Find:
identify this gas
Solution: Working equation: PV = nRT (Ideal gas law)
n (no of moles) = m(mass)/M (Molecular wt.)
3.1 = (4.37/M) x 0.082 x 318
M = 37.985
Now the only diatomic gas which has closest molecular mass is Fluorine (F2) (37.997). The difference in value is probably coming from approximation.
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A student finds another object that looks similar to the first
object. They weigh this second object and record the mass to
be 33.4.g They fill a graduated cylinder about halfway and
record the volume as 12.3mL. The student carefully drops the
object into the graduated cylinder and the water rises to a
volume of 21.7mL.
c) Is this second object, also pure gold? Justify your answer
with a calculation.
The object is not pure gold because it does not the same density as pure gold.
What is density?The density of an object is defined as the ratio of the mass to the volume of an object. We know that the density could be used to characterize an object. This is why we refer to the density of the object as an intrinsic property of the object. Since the density of the object does not change. We could use the density to determine if the second object is gold or not.
Mass of the object = 33.4.g
Inital volume of the water= 12.3mL
Final volume of the water = 21.7mL
Volume of the object = 21.7mL - 12.3mL = 9.4 mL
Density of the object = 33.4.g / 9.4 mL = 3.55 g/mL
The object is not pure gold because it does not the same density as pure gold.
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How can the strength of a force affect velocity?
When the force become stronger, the acceleration becomes larger and the velocity changes by a wider margin.
What is the force?We know that the force is that which makes motion to occur. In other words, an object would continue in its state of rest or uniform motion unless it is acted upon by an external force.
We know that the stronger the force the greater the acceleration since force is directly proportional to the acceleration of a body. Given this statement, it is important to also know that acceleration is the change of velocity with time.
When the force become stronger, the acceleration becomes larger and the velocity changes by a wider margin.
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which procedure cannot be performed on a hot plate, requiring a bunsen burner instead? select one: heating a crucible to remove water from a hydrate heating a solvent to help the solute dissolve heating water to boiling for a water bath heating an isolated solid to dry it
The procedure that cannot be performed on a hot plate, requiring a bunsen burner instead include A. Heating a crucible to remove water from a hydrate.
How to illustrate the information?The procedure that can be performed on a hot plate are:
a. Heating a solvent to help a solute dissolve.
b. Heating an isolated solid to dry it.
c. Heating water to boiling for a water bath.
It should be emphasized that heating a crucible in order to extract water from a hydrate cannot be done using a hot plate. Anyone should avoid heating any ceramic or silica items on a hot plate.
The ideal solution is to heat a crucible to extract the water from a hydrate.
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y = A x + 1/₂ B x²
If y = 23.2, x = 1.40, and B = 3.63, what is A?
A is 14.03 in the given equation y = Ax + (Bx^2)/2, if we substitute y = 23.2, x = 1.40 and B = 3.63.
This is an algebraic equation with two variables of order 2. The values of x, y and the coefficient of x^2 is given here.
The given equation y = Ax + (Bx^2)/2 has the variables A, x, y, and B.
By substituting the variables y, x, and B, we can get A from the equation.
y = 23.2
x = 1.40
B = 3.63
Substituting these values,
23.2 = A*1.40 + (3.63*1.4^2)/2
23.2 = 1.4A + 3.63*1.96/2
23.2 = 1.4A + 7.1148/2
23.2 - 3.5574 = 1.4A
1.4A = 19.6426
A = 19.6426/1.4
A = 14.03
Therefore, A = 14.03
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What is the atomic number of an atom that has two electrons three protons and four neutrons
Answer: 3
Explanation: your protons are your atomic number and the atomic mass is the proton and neutrons totaled
based on your answer in part a, calculate the number of atoms in this amount of 13c ? express your answer numerically in atoms of carbon.
The total number of atoms present in the carbon
atom ¹³C is 2.32 × 10²³ atoms. And the number of electrons present in 2.32 × 10²³ is 1.392 × 10²⁴ electrons.
Carbon is a non-metallic element. It is the element of group 14 of the periodic table. It is tetravalent. It is presented by the symbol 'C'. The atomic number of carbon is 6. And the atomic mass of carbon is 12.011 u. Carbon has four valence electrons.
Total number of atoms present in the carbon atom
[tex] ^{13} C = 2.32 \times 10^{23} \: atoms[/tex]
Total number of electrons present in the carbon atom
[tex] ^{13} C = 1.39 \times 10 ^{24} \: electrons[/tex]
The atomic number of carbon atom
[tex] ^{13} _{6}C = 6[/tex]
The number of electrons present in carbon is,
The atomic number of carbon = the number of electrons
Atomic number = 6
Number of electrons = 6
[tex]The \: number \: of \: electrons \: present \: [/tex]
[tex]in \:2.32 \times 10^{23} \: atoms \: of \: carbon,[/tex]
= Number of electrons present in one carbon atom ×
[tex]2.32 \times 10 ^{23} [/tex]
[tex] = 6 \times 2.32 \times 10 ^{23} [/tex]
[tex] = 1.392 \times 10 ^{24} [/tex]
Therefore, the total number of atoms present in the carbon atom ¹³C is 2.32 × 10²³ atoms. And the number of electrons present in 2.32 × 10²³ is 1.392 × 10²⁴ electrons.
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A dog with a mass of 3.5 kg goes for a run at a pace of 1.4m/s.What is the dog’s Kinetic energy
Answer: KE: 3.43 J
Explanation:
Kinetic energy is represented by the equation [tex]\frac{1}{2}[/tex]m[tex]v^{2}[/tex], with 'm' representing mass and 'v' representing velocity. In this problem, the mass is 3.5 kg, and the velocity is 1.4m/s. Once you do the math, you get:
KE: 3.43 J
Note: J represents joules, the unit of measure used when writing the number for kinetic energy, as well as other things.
10. After removing 68.1 kilograms of old copper tubing from air conditioning units Mark takes his load to a recycling
yard. There he is paid $2.50 per pound. How much money did he make?
The amount made from removing 68.1 kilograms of old copper tubing is $375.34.
Amount made from removing 68.1 kilograms of old copper tubing
The amount made from removing 68.1 kilograms of old copper tubing is calculated as follows;
A = mass x cost per mass
mass = 68.1 kg = 150.1348 lb
Amount = $2.5/lb x 150.1348 lb
Amount = $375.34
Thus, the amount made from removing 68.1 kilograms of old copper tubing is $375.34.
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A group of Grade 12 students were asked to perform an experiment on the reaction between calcium carbonate and hydrochloric acid as shown in the set up. The volume of carbon dioxide (CO₂) gas was collected using a glass syringe and the observation was recorded in the table below. Conical-> flask hydrochloric acid calcium carbonate Stop watch syringe retort stand An experiment set up to measure the volume of carbon dioxide gas released from the reaction between calcium carbonate and hydrochloric acid.About this, find out how much volume of carbon dioxide is produced in the first minute?
volume of carbon dioxide is produced in the first minute 0.56 L of CO₂
Salt, carbon dioxide, and water are produced when metal carbonate and an acid react. In order to create calcium chloride (CaCl2), carbon dioxide (CO2), and water, calcium carbonate (CaCO3) combines with hydrochloric acid (HCl) (H2O). We are aware that 22.4 L is the volume occupied by 1 mole of any gas at 0° C and 1 atm pressure.
Thus, 100 g of CaCO₃ produces 22.4 L of CO₂
So, 2.5 g CaCO₃ will form, which equals 100.
56 L of CO (2.5*22.4/100)
= 0.56 L of CO₂
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Sanah spilled a small amount of hcl on the lab bench. What do you recommend that she use to neutralize the spill before she cleans it up?.
One chemical that could be used for the neutralization of HCl is sodium hydroxide.
What is neutralization?Neutralization is a reaction that occurs between an acid and a base to yield salt and water only. In this type of reaction the acid is rendered less harmful than it was when it poured on the bench.
One chemical that could be used for the neutralization of HCl is sodium hydroxide. It must be know that a base has to be used for the neutralization and it has to be a strong base such as sodium hydroxide.
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(1-5) the burning by fossil fuels by humans in 2012 introduced approximately 8 petagrams (pg) of carbon per year into the atmosphere in the form of co2
8 x 10^12 kg C yr^-1 of C were placed in the atmosphere each year.
kg of C yr-^1 = (8 Pg C yr^-1)(10^15 g C/1 Pg C)(1 kg C/1000 g C)
kg of C yr^-1 = 8 x 10^12 kg C yr^-1
Petagrams is unit of mass equal to 1,000,000,000,000,000 (10^15) grams. Symbol: Pg
Sometimes used in Carbon Dioxide numbers, it is equivalent to Metric Gigatons (Giga) 10^9 x (Ton) 10^3 x (kg) 10^3 = 10^15
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Most hydrogen (H, #1) atoms have a mass of 1. How many protons would there be in one of these hydrogen atoms? (1 pt)
*
1 point
0
1
2
4
Answer: One
Explanation: All elements have just one proton and one neutron