Answer:
i k ow its not the exact anwser but ih ope this helps
Explanation:
Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made. In some reactions the energy required to break bonds is larger than the energy evolved on making new bonds, and the net result is the absorption of energy. Such a reaction is said to be endothermic if the energy is in the form of heat. The opposite of endothermic is exothermic; in an exothermic reaction, energy as heat is evolved. The more general terms exoergic (energy evolved) and endoergic (energy required) are used when forms of energy other than heat are involved.
A great many common reactions are exothermic. The formation of compounds from the constituent elements is almost always exothermic. Formation of water from molecular hydrogen and oxygen and the formation of a metal oxide such as calcium oxide (CaO) from calcium metal and oxygen gas are examples. Among widely recognizable exothermic reactions is the combustion of fuels (such as the reaction of methane with oxygen mentioned previously).
why the back torn of camel is important?
The back torn of Camel is important because it acts as a storage facility for
fats.
Camels are found in desert regions where there is scarcity of
Food WaterThis makes the food it eats to get stored at the back in the hump
region as fats so as to enable it survive long periods of unavailability of food.
The fats are gradually metabolized into nutrients which is used by the body
cells to ensure adequate energy availability and optimal survival.
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Under an O2(g) pressure of 1.00 atm, 28.31 mL of O2(g) dissolves in 1.00 L H2O at 25 °C. What will be the molarity of O2 in the saturated solution at 25 °C when the O2 pressure is 4.47 atm? Assume that the solution volume remains at 1.00 L.
In the first case, the molarity of oxygen gas is 0.0012 mol/L. In the second case, the molarity of oxygen gas is 0.0052 mol/L .
We have to obtain the number of moles of oxygen as follows;
P = 1.00 atm
V = 28.31 mL or 0.02831 L
n = ?
R = 0.082 atm LK-1mol-1
T = 25 °C + 273 = 298 K
n = PV/RT
n= 1.00 atm × 0.02831 L/ 0.082 atm LK-1mol-1 × 298 K
n = 0.0012 moles
Molarity = Number of moles/Volume = 0.0012 moles/1.00 L = 0.0012 mol/L
For the second case;
P = 4.47 atm
V = 28.31 mL or 0.02831 L
n = ?
R = 0.082 atm LK-1mol-1
T = 25 °C + 273 = 298 K
n = PV/RT
n = 4.47 atm × 0.02831 L/0.082 atm LK-1mol-1 × 298 K
n = 0.1265/24.436
n = 0.0052 moles
Molarity of oxygen = 0.0052 moles/1.00 L = 0.0052 mol/L
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Help please witb this
Answer:
9
Explanation:
In a chemical equation, the subscript numbers next to each element's symbol tell us how many atoms of that element are in the substance. So, for example, in H₂O, there are 2 atoms of hydrogen since there is a "₂" next to the H.
What's next to our H in C₄H₉? It looks like "₉," so we can determine that there are 9 hydrogen atoms in C₄H₉ (which is butyl, by the way).
Hopefully that's helpful! :)
Can anyone help me with this question?
sure i can help
so u have to ask someone else
How much Ba(OH)2, in grams, is needed to make a 1.00m aqueous solution?
Answer:
We can say that we need 171 g barium hydroxide needed to make one model equals solution.
Explanation:
I hope this answered your question.
Using this chemical stoichiometry, determine the number of moles of carbonic acid that can be produced from 2 mol NaHCO3 and 7 mol HCl.
Answer:
reaction is NaHCO3 + HCL = H2CO3 + NaCl
the ratios are 1:1
the 8 moles of HCl are in excess
so if you use 4 moles of NaHCO3 then you will obtain 4 moles of carbonic acid
hope that helps
Explanation:
Calculate the molarity of a solution that has 18.0 g of glucose, C6H12O6, dissolved in 80.0 g of water.
Answer:
same question
Explanation:
I need help with the second and third part of this problem.
The volume of a ballon is 2.85L at 1.00 atm. What pressure is required to compress the balloon to a volume of 1.70L?
Answer:
1.68 atm (if temperature is constant)
Explanation:
p1 * v1 = p2 * v2
1 * 2.85 = p2 * 1.70
2.85 / 1.70 = p2
p2 = 1.6764
There are so many gas laws like Charles's law, Avogadro’s law and many more, out of which Boyle's law is one of the most important law among all gas laws. The pressure is required to compress the balloon to a volume of 1.70L is 1.6764 atm.
What is Boyle's law?According to Boyle's law pressure is inversely proportional to volume at constant Temperature. It is applicable only on the ideal gases. Since temperature is constant here, we can apply this law.
Mathematically
P₁V₁=P₂V ₂
P₁= initial pressure of balloon =1.0atm
V₁= initial volume balloon =2.85L
P₂=final pressure balloon =?
V ₂=final volume balloon =1.70L
Putting all values
1 × 2.85 = P₂×1.70
2.85÷ 1.70 = P₂
P₂ = 1.6764 atm
Therefore, the pressure is required to compress the balloon to a volume of 1.70L is 1.6764 atm.
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Which one of the following salts has the highest molar solubility in water?
Answer:
Correct option is
C
Ag
2
CO
3
; K
sp
=6.2×10
−12
(A) For CaCO
3
,S=
Ksp
=
8.7×10
−9
=9.3×10
−5
M
(B) For CuS,S=
Ksp
=
8.5×10
−45
=9.2×10
−23
M
(C) For Ag
2
CO
3
,S=(Ksp/4)
1/3
=(6.2×10
−12
/4)
1/3
=1.15×10
−4
M
(D) For Pb(IO
3
)
2
,S=(Ksp/4)
1/3
=(2.6×10
−13
/4)
1/3
=4×10
−5
M
Hence, Ag
2
CO
3
has the greatest molar solubility in pure water.
Calculate the pH at the equivalence point for the following titration: 0.25 M HCOOH versus 0.25 M NaOH.
The pH at the equivalence point for the titration of 0.25 M HCOOH versus 0.25 M NaOH is 8.5.
Let's consider the following neutralization reaction.
HCOOH + NaOH ⇒ HCOONa + H₂O
At the equivalence point, 0.25 M HCOOH completely reacted with 0.25 M NaOH to form 0.25 M HCOONa.
HCOONa undergoes hydrolysis. The net ionic equation is:
HCOO⁻(aq) + H₂O(l) ⇄ HCOOH(aq) + OH⁻(aq)
Given the concentration of HCOO⁻ is 0.25 M (Cb) and the basic dissociation constant of HCOO⁻ is 4.8 × 10⁻¹¹ (Kb), we can calculate the concentration of OH⁻ using the following expression.
[tex][OH^{-} ] = \sqrt{Kb \times Cb } = \sqrt{(4.8 \times 10^{-11} ) \times 0.25 } = 3.5 \times 10^{-6} M[/tex]
The pOH of the solution is:
[tex]pOH = -log [OH^{-} ] = -log (3.5 \times 10^{-6} ) = 5.5[/tex]
The pH of the solution is:
[tex]pH = 14 -pOH = 14 -5.5 = 8.5[/tex]
The pH at the equivalence point for the titration of 0.25 M HCOOH versus 0.25 M NaOH is 8.5.
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Science 5th grade very PLZ answer correctly TYSM WILL MARK AS BRAINLIST IF ANSWERED TODAY!
Answer:
A
Explanation:
Conducts electricity:
-Steel
-Gold
-Copper
-Aluminum
Does not conduct electricity:
-Plastic
-Glass
-Rubber
-Wood
Metallic bonding causes metals to conduct electricity. Some metals are more highly conductive than others.
Hope this helps :)
Answer:
The first table correctly classifies the materials.
Explanation:
In table 1, all the elements on the left side are transition metals, expect for steel. Steel is not an element, it's an alloy (Which is a combination of two or more elements).Transition metals are very good conductors of heat and electricity. The reason why transition metals make such good conductors is because their outer electrons can move freely in their atom.
The right side of table 1 correctly classifies the materials that do not conduct electricity. The reason why those materials are poor conductors is because they all have their electrons tightly bound to their atoms.
In table 2, it classifies copper has a poor conductor which is wrong. It also classifies wood as a good conductor which also wrong for the reasons I stated above.
The weight of a piece of a cubic foot wood is 40lbs. It is thrown into a pool of
water. What is the weight of the water displaced?
Answer:
Volume of wood = 1 ft3 Mass of wood (m) = 40 lbs = 18.1437 kg Let the volume of water displaced be V. Density of water (ρ
Explanation:
how much heat is required to melt 3.15 mol of solid acetate acid
HELP QUICK carbon dioxide makes up less than 1 percent of earths atmosphere, and oxygen makes about about 20 % These percentages are maintained most directly by what
Answer:
respiration and photosynthesis
Explanation:
The percentages of carbon dioxide and oxygen in Earth's atmosphere are maintained most directly by cellular respiration and photosynthesis.
What is photosynthesis?Photosynthesis simply refers to a biological and chemical process through which green plants convert light energy derived from the Sun into chemical energy, so as to make their food while using carbon dioxide (CO₂) and releasing oxygen.
On the other hand, cellular respiration is a series of metabolic reactions that occur in living cells and it involves the use of oxygen that are typically produced by green plants (autotrophs) during photosynthesis.
This ultimately implies that, the percentages of carbon dioxide (1%) and oxygen (20%) that are contained in Earth's atmosphere are maintained most directly by cellular respiration and photosynthesis.
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Someone help pls this is due today
Answer:
arrow down is gravity
Explanation:
Answer: The person above me is right
Explanation:
Have a Great day!
HELP
How can you tell if mass is being conserved
Calculate the number of carbon dioxide (CO2) molecules produced in the
reaction if 0.7525 moles of oxygen gas (O2) are consumed.
Answer:
4.530 X 10^23 MOLECULES OF CO2
Explanation:
Calculate the number of carbon dioxide (CO2) molecules produced in the
reaction if 0.7525 moles of oxygen gas (O2) are consumed
so
C + O2-----------CO2
1 MOLE OF 02 produces 1 mole of CO2
so
0.7525 moles O2 produce 0.7525 moles
1 mole is 6.02 X 10^23
so
0.7525 moles is 0.7525 X 6.02 X 10^23 -
=
4.530 X 10^23 MOLECULES OF CO2
how many moles of s atoms are in 1 mol of CaSO4
I think u asked for the atoms of sulfur? its 4..
Explanation:
calcium = 4
sulfur = 4
oxygen = 4
I hope this is correct
A solution is prepared by dissolving 15.0 g of pure HC2H3O2 and 25.0 g of NaC2H3O2 in 775 mL of solution (the final volume). Incorrect answer icon Incorrect. Did you use the correct form of the H-H equation
Al^+3
protons =
electrons =
neutrons =
N^-3
protons =
electrons =
neutrons =
Explanation:
aluminium
proton= 13
electron=13
neutron=27
nitrogen
proton= 7
electron=7
neutron= 14
What is a peninsula?
Answer:
A peninsula ( Latin: paeninsula from paene "almost" and insula "island") is a landform surrounded by water on most of its border while being connected to a mainland from which it extends.
Explanation:
CAN I GET BRAINLIEST
If 48 grams of carbon are burned in the presence of 128 grams of oxygen, the amount of carbon dioxide that forms will be ______.
A. 48 grams
B. 128 grams
C. 176 grams
D. 224 grams
Answer:
C. 176 grams
Explanation:
48g / (12g/mol) = 4.0mol. Moles of Oxygen used. = 128g / (32g/mol) = 4.0mol. C + O2 => CO2. Therefore ...
How do the ecological pyramid shapes compare
Answer:
it allow us to compare the amount of energy passing through each tropical level over a period of time
A cylinder contains helium gas with a volume of 2.60 L at 20 C and 768 mm Hg. If the balloon ascends to an altitude where the helium pressure is 614 mm Hg, what is the volume of gas? (Assume the temperature has not changed)
a. 12.2
b. 1.2
c. 20.2
d. 3.2
Answer: 3.2 [D]
Explanation:
Use Boyles law
(Might want to rotate image, sorry!)
Explain how signals are processed and stored by the brain.
[tex] \: \: \: \: [/tex]
Neurons communicate with each other by sending chemical and electrical signals. Each neuron is connected with other neurons across tiny junctions called “synapses”. Impulses rush along tiny fibres, like electrical wires, from one neuron to the next. Electrical impulses travel through neuronshope it helps[tex] \: \: \: \: \: \: \: [/tex]
The empirical formula of hydrazine, molecular mass 32 grams, is NH2. What is the molecular formula of hydrazine?
A) (NH)4
B) N2H4
C) NH
D) NH2
Answer:
B) N2H4
Explanation:
Calculate the amount of energy That an obsect Can absorb from Yellow light Whose wave length is 589 nm.
Explanation:
E = hf
c= f × lamda
f= c/ lamda
c= speed of light
f= frequency
lamda = wavelength
E = h c/ lamda
E = 6.626 × 10^-34 Js × 3 × 10^8 ms-1 / 589 × 10^-9 m
= 3.37 × 10^15 J
which phase has the highest entropy?
a. gas
b. liquid
c. solid
d. aqueous
Answer:
Gas>Liquid>Solid
Explanation:
Entropy by definition is the degree of randomness in a system. If we look at the three states of matter: Solid, Liquid and Gas, we can see that the gas particles move freely and therefore, the degree of randomness is the highest.
As the reaction goes through phases, the phase that has the highest entropy is the gas state. This is further explained below. Option A is correct.
What is entropy?A thermodynamic number that represents the inability of a system's thermal energy to be converted into mechanical work, and is commonly understood as the system's degree of disorder.
In conclusion, we have that as the reaction goes through phases, the gaseous state has the highest entropy.
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Diamond has a macromolecular structure and iodine is a simple covalent molecule. Use your knowledge of structure and bonding to explain why diamond has a higher melting point than iodine.
Answer:
Diamond is covalently bonded and has a giant covalent structure. Covalent bonds require lots of energy to break as they are strong so diamond has the highest melting point. Iodine has only weak intermolecular forces (instantaneous dipole-dipole interactions or London forces) whereas hydrogen fluoride has a permanent dipole and can hydrogen bond (as well as having London forces).
Explanation:
hope to help