Explain how the percentages of nitrogen , oxygens and carbon dioxide in the earth atmosphere today have changed from the earth
Answer:
See below
Explanation:
The atmosphere of the earth hundreds of millions of years ago was only water vapour and carbon, both from the one ocean that existed around the continental body of Pangea. The photosynthesis process and exache (⊕) caused the percentages to decrease.
An artificial biosphere is an enclosed area that contains the elements necessary for human life to exist. Suppose scientists want to develop an artificial biosphere on a new planet. The new planet has an atmosphere that is 96% carbon dioxide with only trace amounts of oxygen. What could humans do to make enough oxygen to survive? Explain your answer.
Answer:
See Explanation
Explanation:
A biosphere is a zone of life found on earth. Since the artificial biosphere has all the elements that support and sustain human life, then there must also be soil in the artificial biosphere.
If that is the case, then we can engage in massive tree planting. Trees take in carbon dioxide and release oxygen. Hence if a large number of trees are planted all over the artificial biosphere, the trees will eventually produce large enough oxygen to support human life overtime.
how many atoms are equal to 1.5 moles of hellium
Answer:
There are 1.8×1024 atoms in 1.5 mol HCl
Explanation:
A sample of neon gas at 200.0C has a pressure of 0.325 atm. At what Celsius temperature will the pressure reach 0.675 atm?
Answer:
407.7c
Explanation:
200.0C = 0.325 atm
400.0C = 0.650 atm
407.7C = 0.675 atm
A sample of neon gas at 200.0C has a pressure of 0.325 atm. The temperature is 407.7 C is by the pressure reaches 0.675 atm.
What are gas laws?There are three basis gas laws which relates the pressure, temperature, and volume of the gas.
The temperature and pressure increase is given this.
200.0C = 0.325 atm
400.0C = 0.650 atm
407.7C = 0.675 atm
Thus, the correct option is 407.7C = 0.675 atm.
Learn more about gas laws
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31. A mixture with sand, pink sugar and water would be best separated using
Answer:
Filtration and evaporation
Explanation:
A mixture of sand, pink sugar and water can be separated by filtration and evaporation.
The pink sugar is already dissolved in the water but the sand remains undissolved in the water hence it can be filtered off. The filtrate now contains the sugar.
The sugar is obtained from the filtrate by evaporation of the solution to yield the solid pink sugar and steam which can be condensed again to give liquid water.
Because both tin and carbon are members of Group 4A(14), they form structurally similar compounds. However, tin exhibits a greater variety of structures because it forms several ionic species. Predict the shape and ideal bond angle, including any deviations, for SnCl3−.
Answer:
See Explanation
Explanation:
Elements in group fourteen are mostly known to form compounds in which there are four electron domains leading to a tetrahedral electron domain geometry.
However, the presence of lone pairs affects the shape of the molecule. SnCl3− has four electron domains, three of them are bond pairs while one is a lone pair. The shape of the molecule is based on a tetrahedron, however the observed geometry is trigonal pyramidal due to the presence of the lone pair. Its bond angle is now less than the predicted 109 degrees.
20 POINTS 1. What is the contour interval of the above topographic map? 2. What is the change in elevation from point Y to point Z?
3. Which way does the Maple Stream flow?
4. Which hill is taller?
5. Which hill has the steepest sides?
6. What is the elevation of point A?
Answer:
1 1
Explanation:
Hill
1
i would appreciate it if someone could show me the net ionization reaction for the following equation:
CaCl2(aq) + 2NaHCO3 -> CaCO3 + 2NaCl + CO2 + H2O
thanks in advance!!
Answer:
Deduce the balanced chemical equation:
CaCO3(s) + 2HCl(aq) > CaCl2 + H2O(l) + CO2(g)
2. Write as ionic species:
Ca2+(aq) + CO3 2- (aq) + 2H+ + 2Cl- > Ca2+(aq)+ 2Cl-(aq) + H2O(l) + CO2(g)
3. Identify ions on the right that also appear on the left, and eliminate them. (As Robert Cruikshank says, these are known as ’spectator ions’ and take no overall part in the reaction):
CO3 2- (aq) + 2H+(aq) > H2O(l) + CO2(g)
This is the balanced ionic equation.
What does the line with “alternating spikes and semicircles” mean?
Answer:
The line with spikes and semicircles is a stationary front, it brings days of steady rain.
Explanation:
L means Low pressure, it brings stormy weather with strong winds.
H means High pressure, it brings fair weather and light winds.
The line with spikes is a cold weather front, it brings thunderstorms and colder
temperatures.
The line with spikes and semicircles is a stationary front, it brings days of steady rain.
8. What is the chemical equation when calcium chloride combines with water?
Answer:
CaCI2 + H2O = Ca(OH)2 + HCI
What is the total number of moles of ions produced by dissolving 0.5 mole of aluminum sulfate, Al2(So4)3 in water?
Answer:
2.5 moles of ions
Explanation:
In order to solve this problem, first we need to determine how many moles of ions are there in one mol of aluminum sulfate:
1 Al₂(SO₄)₃ mol contains 2 Al⁺³ moles and 3 SO₄⁻³ moles, meaning that in total it contains 5 moles of ions.With the above information in mind we can proceed to calculate how many moles of ions would there be in 0.5 moles of Al₂(SO₄)₃:
0.5 mol Al₂(SO₄)₃ * [tex]\frac{5molesOfIons}{1molAl_2(SO_4)_3}[/tex] = 2.5 moles of ionsis smoke chemically combined?
Answer:
yes smoke is chemically combined because smoke is a collection of airborne solid and liquid particles and gases released when a material burn.
hope it is helpful to you
Given the [H+] = 3.89x10^-7M, what is the [OH-]?
Answer:
[H][OH] = 10^-7
[OH] = 10^-7/ 3.89x10^-7 = 0.257M
1
Select the correct answer.
Which type of energy is thermal energy a form of?
OA.
chemical energy
B.
kinetic energy
O c.
magnetic energy
OD
potential energy
Reset
Next
Answer:
i think kinetic energy sorry if I'm wrong.
Which would be true of a bar magnet?
Choose all that apply:
A. The magnet would be strongest at its two edges.
B. The bar has a uniform strength throughout.
C. The two ends of the magnet are called poles.
D. The two ends of the magnet are positively or negatively charged..
Answer:
C is a North Pole to South Pole
Explanation:
A magnet has two poles
What is the oxidation number of carbon in the compound carbon dioxide, CO2?
A) +3
B)+2
C)-3
D)+4
Answer:
the oxidation number is 4
molecular formula of calcium oxide
Answer:
Calcium oxide, commonly known as lime, is a chemical compound with the formula CaO.
Please help!!!! Best answer will get brainliest
Answer:
covalent network
Explanation:
trust me on this one
C12H22011 → 12C + 11H20
How many atoms of hydrogen are involved in this chemical reaction?
A.11
B.22
C.33
D.44
Answer:
the answers to your question is b.22
how is density related to the color of igneous rocks?
Answer:
The density of igneous rocks is related to its color. Darker colored rocks have a higher density because of its greater mineral and iron content. Its characteristics is opposite compared to lighter colored rocks that have less density because of lower mineral and iron content
what is the mole ratio of zinc to sulfuric acid
Answer:
Zn + H2SO4 ZnSO4 + H2
Explanation:
Start by balancing the equation. This one is already balanced.
(1 zinc, 2 hydrogen, 1 sulfur and, 4 oxygen on each side of the equation).
The mole ratio just refers to the coefficient (the number before each molecule or atom). Since there are no numbers in this equation all coefficients are 1.
Mole ratio = 1:1
can some kind soul help me plss
convert propanamine to propylalcohol
Answer:
Yeah
Explanation:
Propylene glycol can be dehydrated to propionaldehyde which can in turn be reductively aminated to propylamine.
Propionaldehyde can be converted to n-propyl amine in two steps.
Conversion of propionaldehyde to oxime
Propionaldehyde is treated with hydroxyl amine in weakly acidic medium to form imine product known as propionaldoxime.
CH₃CH₂CHO+NH₂OH->CH₃CH₂CH=N-OH+H₂O
Reduction of imine to form amine
In this step,propionaldoxime is reduced by proper reducing agent like Na in ethanol to form n-propyl amine.
CH₃CH₂CH=NO-Na-C₂H5OH-> CH₃CH₂CH₂NH₂
Why are protists that are heterotrophs considered "animal-like"? A they make their own food. B They don't need energy C They feed on other organisms.
Answer:
A, Animal-like protists are called protozoa. ... Like animals, they can move, and they are heterotrophs. That means they eat things outside of themselves instead of producing their own food
Explanation:
3. Designing the caisson…Using technology you think would be available in the late 1800s, what could you do to keep temperatures in the caisson as low as possible? How else can you protect your workers from the dangers of high heat?
Answer:
By using insulating material.
Explanation:
By making the material cover with insulator in that way the we can protect the workers from the dangers of high heat because the insulator are the poor conductor of heat so the heat from the surrounding environment did not enter inside the metal. There are certain materials which remain cool if they receive heat from the surrounding environment so by using these types of materials can be useful on the cover of caisson to reduce heat in the inner side and protect the workers from the dangers of high heat.
(1) Complete the word equation for the complete combustion of methane in
oxygen.
→ water +
methane +
en of methane can produce carbon and
Cooled in ice to help the water vapour condense. Tube 2 – contains lime water, goes cloudy to show the presence of carbon dioxide. Word equation: (hydrocarbon + oxygen → carbon dioxide + water) Methane + oxygen → carbon dioxide + water.
ito Ang naimbento ni graham bell na nagpabilis sa pakikupagtalastasan
Answer:
ФОТОГРОФИРУЙ
ИЛИ НАПИШИ
В КОМЕНТЫ
This is due at 2:00 am today. I only have a few points. No links please I need a real answer.
NaOH + AlCl3 --> Al(OH)3 + NaCI.
How many grams of AlCl3 are needed to completely react with 2.25 of NaOH?
Answer:
7.5 g of AlCl3
Explanation:
The given equation is;
NaOH + AlCl3 --> Al(OH)3 + NaCI.
By inspection, it is not balanced because OH and Clare not equal on both sides of the equation.
Thus, let's make them equal by balancing the equation.
Cl has 3 on the left, so we will make it to have 3 on the right. Same thing with OH on the right and we will make it to have 3 on the left. Thus:
3NaOH + AlCl3 --> Al(OH)3 + 3NaCI
We can see that;
NaOH has 3 moles
While AlCl3 has 1 mole
Thus, to find how many grams of AlCl3 will be required to completely react with 2.25g of NaOH ;
2.25g of NaOH × (3 moles NaOH/39.997 g/mol of NaOH) × (1 mole of AlCl3/3 moles of NaOH) × (133.34 g/mol of AlCl3/1 mol AlCl3) = 7.5 g of AlCl3
What is the pH of a solution that has a [OH^-] of 1x10^-2?
2
12
9
8
An object is moving across a surface, but it does not gain or lose speed.which best describes the objects force
Answer:
Constant
Explanation:
Here's the definition of the noun:
"A situation that does not change"
In this case the situation is the speed of the object.
If you'd like to go into further detail, let's move away from English and jump into Physics. The question asked for "object's force" - keyword: 'force'. What's the formula for force? F = m * a.
F = Force, m = mass, a = acceleration.
Okay well, the question said only the speed changes and doesn't mention the mass changing so if the mass changes the force won't be constant. However, if the mass doesn't change (constant), we can continue to acceleration.
The formula for acceleration is (I think) m/s^2, that's metres over time, squared. As we know from English class; the speed is constant and thus the square of that speed is also constant - therefore the acceleration is constant.
Now, putting them together, assuming the mass is constant, we know the acceleration is constant so the force has to be constant. Case closed.
*mic drops, this was a waste of time*
write one word for the following short form of an element
Answer:
symbol?
Explanation: