Answer:
353kg
Explanation:
2000 x 0.1765 = 353kg
for every 1 cubic metre of helium there is 0.1765 kg of it
the balloon is holding 2,000 cubic metres of the helium.
That means that there are 2000 times of 0.1765kg of helium in the balloon
so you times 0.1765kg by 2000
Why are cultural ecosystem services important to humans?
Answer:
Agriculture, forestry, and fisheries are examples of cultural ecosystem services
Explanation:
They provide food (fisheries, agriculture) to both humans and other animals, and forestry provides recreation for humans and an ecosystem for animals!
How does solidification of alloys differ from solidification of pure metals?.
Answer:
Solidifications of alloys occurs over a range of temperatures whereas solidification of a pure metal will take place at a constant temperature
Li2SO4
How many Li atoms are in the formula Li2SO4?
14.
How many S atoms are in the formula Li2SO4?
15.
How many O atoms are in the formula Li2SO4?
16.
How many total atoms are in the formula Li2SO4?
Answer:
Lithium = 2
Sulphur = 1
Oxygen = 4
Total = 7
I don’t know what atoms are. What are atoms?
PLEASE ANSWER THIS ASAP!
An atom with the same number of protons but different number of neutrons is called an _______________________
the answer to your question is
isotope
Which substances have Delta. Hf = 0 kJ/mol by definition? Select all that apply. O2(g) N(g) H2O(l) Br2(l) Fe(s) He(g) S6(s)
Answer:
O₂(g), Br₂(l) Fe(s), He(g)
Explanation:
Those elements that occur naturally in nature are the right answers because it took nothing to make them
Delta. Hf = 0 means no heat was lost or gained
standard enthalpy of formation is defined as the change in enthalpy when one mole of a substance in the standard state is formed from its pure elements under the same conditions
O₂(g): Yes, it is a pure element in the standard state.
N(g): No, the pure element in the standard state is N₂(g).
H₂O(l): No, it is not a pure element but a compound.
Br₂(l): Yes, it is a pure element in the standard state.
Fe(s): Yes, it is a pure element in the standard state.
He(g): Yes, it is a pure element in the standard state.
S₆(s): No, the pure element in the standard state is S₈(s, rhombic).
socraticorg
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what is a spectorscope?
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Study of the absorption and emission of light and other radiation by matter, as related to the dependence of these processes on the wavelength of the radiation.
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help me pleaseʕ ꈍᴥꈍʔ
Answer:
(a) All are correct
Explanation:
catalyst a substance which speeds up a chemical reaction and remains itself unchanged.
example: Iron used in Haber process for the manufacture of ammonia.
5. How many grams of cuso4 are needed to prepare 100. Ml of a 0. 10 m solution?.
Answer:
Remember that there are 5 moles of water for every 1 mole of hydrate
159.61g mol−1(159.61+5×18.015)g mol−1×100=63.92% CuSO4
This tells you that for every 100 g of copper(II) sulfate pentahydrate, you get 63.92 g of anhydrous copper(II) sulfate. Use this as a conversion factor to get
1.596g CuSO4⋅100 g CuSO4⋅5H2O63.92g CuSO4=2.497 g CuSO4⋅5H2O
Rounded to two sig figs, the answer will be
what is aerobic respiration and anaerobic respiration
Answer:
aerobic (which needs oxygen) and anaerobic (which doesn't need oxygen). Aerobic respiration is a fixed metabolic reaction that takes place in the presence of oxygen, going on in a cell to transform chemical energy into ATPs. Anaerobic respiration is a process of cellular respiration in which the excessive energy electron acceptor is neither oxygen nor pyruvate derivatives
hope this will help you ✨
The chemical equation shown represents photosynthesis. Carbon dioxide plus A plus light with a right-pointing arrow towards B plus oxygen. The arrow has an x above it. B represents a substance in a plant involved in photosynthesis. What is its role?
Answer: Option B; It traps light energy and converts it into chemical energy.
Explanation: This substance is chlorophyll. It is a pigment present in leaves of all plants. It absorbs light energy and provides it to carry out the process of photosynthesis. Light energy is converted into chemical energy, in form of NADPH and ATP, which can be used by plants for photosynthesis.This pigment is present only in plants, so option A is incorrect.This pigment only absorbs and transfers energy to other molecules, and is not associated with carbon dioxide directly, so option C and D are also incorrect.What is the outdoor temperature where you are right now?.
The outdoor temperature, also known as the ambient temperature, is a measure of the amount of heat in the environment and this depends on the kind of environment.
TemperatureThe outdoor temperature around here is about 33 [tex]^oC[/tex].
The temperature in the tropical area, where this area belongs, varies between 27 to 35 [tex]^oC[/tex] with an annual average of about 28 [tex]^oC[/tex].
In order words, tropical regions are generally warm, unlike temperate regions.
Tropical regions also have two distinct seasons, the rainy and the dry seasons. This is unlike temperate regions that have summer, spring, winter, and autumn.
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At night, an equilibrium reaction between two different nitrogen compounds generates N2O5N2O5 in the atmosphere, as represented below.
Reaction 1: NO3(g)+NO2(g)⇄N2O5(g) K=2.6×10−11NO3(g)+NO2(g)⇄N2O5(g) K=2.6×10−11
During the day, solar radiation is absorbed by NO3(g), resulting in its decomposition. Which of the following best explains whether the equilibrium concentration of N2O5(g) in the atmosphere in the daytime is different from that in the nighttime, and why?
a) [N2O5] will be higher during the day, because the decomposition of NO3(g) results in an increase in the rate of production of N2O5(g).
b) [N2O5] will be higher during the day, because NO2(g) will be in excess, leading to an increase in the rate of production of N2O5(g)
c) [N2O5] will be higher at night, because the decomposition of NO3(g) in the daytime will result in an increase in the rate of consumption of N2O5(g) to reform NO3(g)
d) [N2O5] will be about the same at nighttime and daytime, because the amount of NO2(g) will not be changed and the equilibrium will not be affected.
The breakdown of NO3 in the day leads to more consumption of N2O5 in the day hence its concentration is greater at night than in the day.
What is equilibrium constant?The equilibrium constant is a number that shows how much reactants are converted to products in a reaction. It is often shown as capital letter K in English.
Given the situation described in the question, we know that the concentration of N205 will be higher at night, because the decomposition of NO3(g) in the daytime will result in an increase in the rate of consumption of N2O5(g) to reform NO3(g).
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Consider the reaction below. HI H2O Right arrow. H3O I– Which is an acid-conjugate base pair? HI and H2O H2O and H3O H3O and I– HI and I–.
HI and I⁻ is the acid-conjugate base pair.
What is acid and conjugate base pair?According to Bronsted-Lowry definition of acid and base, those pair which are differ in the single no. of proton or H⁺ ion is known as acid and conjugate base pair or base and conjugate acid pair.
Given chemical reaction is:
HI + H₂O → H₃O⁺ + I⁻
Here, HI = acid,
H₂O = base,
H₃O⁺ = conjugate acid and
I⁻ = conjugate base
Hence, option (d) is correct i.e. HI & I⁻ is the acid-conjugate base pair.
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Answer:
d, HI and I–
Explanation:
i copied the other guy
Consider the reaction below.
HI + H2O Right arrow. H3O+ + I–
Which is an acid-conjugate base pair?
HI and H2O
H2O and H3O+
H3O+ and I–
HI and I–
SOMEONE PLEASE HELP ME WILL MARK BRAINLIEST PLEASE!!
moles of oxygen: 1/2 x moles of water
= 1/2 x 7.8 = 3.9
What is the mass of 8 moles of Fe2O3?
Answer: 688 grams
Explanation:
A chemist wants a 0. 100 M solution of NaOH. She has 0. 0550 mol NaOH available. What volume of solution is needed to make the mixture?.
Answer:the answer is 0.0550L
Explanation:
What happens when two objects with different masses collide?
Answer:
if the colliding objects have unequal mass, they will have unequal accelerations as a result of the contact force that results during the collision.
Which temperature scale has the highest value for the boiling point of water?
Answer:
The Kelvin Scale has the highest value fir the boiling point of water. The Kelvin degree is the same size as the Celsius degree; hence the two reference temperatures for Celsius, the freezing point of water (0°C), and the boiling point of water (100°C), correspond to 273.15°K and 373.15°K, respectively.
Answer:
The Answer is Kelvin
Explanation:
Have a nice day/night!!
why am im 6,3 a 15 but my dad only 5 ft 3. l need to know this
Answer:
genatics play a huge part. Your mom may be on the tall side or may have cheated on your father. Plus she may of gotten married before you and her father where married or you may of allready been born before she meant your father meaning you have a differnt biological dad then you think.
Explanation:
Hope This Helps
Have A Great Day
~Zero~
Find the odd one out and give a reason for your answer. knife, mirror, steel plate, spoon, stone.
Answer:
All are reflective except for stone
i guess it is stone
Explanation:
Hope it helps!!!
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Mirror is the odd one because it is the only thing used on a dressing table.All the other items like knife, steel plate, spoon, stone are used in kitchen for performing different activities like slicing, serving, tasting, breaking etc..Only mirror has no use in kitchen. Hence, it is the odd one!!~7. How many moles of oxygen will occupy a volume of 2.5 liters at 97.6 kPa and 25.0°C?
Which of these describes why a stent is used?
O A. To open an artery near the heart
O B. To repair a weak heart valve
O C. To increase the biocompatibility of a heart transplant
O D. To enhance the durability of a pacemaker
SUBMIT
Answer:the correct answer is A.To open an artery near the heart
Explanation:I just took the test :)
A stent is used to open an artery near the heart and the correct option is option A.
A stent is commonly used in medical procedures to open up narrowed or blocked arteries near the heart. It is a small, mesh-like tube typically made of metal or synthetic materials. The stent is inserted into the affected artery and expands, effectively widening the artery and improving blood flow. This procedure is known as coronary angioplasty or stenting.
The narrowing or blockage of arteries can occur due to atherosclerosis, a condition in which plaque builds up on the artery walls. This can lead to reduced blood flow and potentially result in chest pain (angina) or even a heart attack. By placing a stent, the artery is opened up, allowing for improved blood flow to the heart muscle.
Thus, the ideal selection is option A.
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A balloon filled with air has a volume of 4.24 liters at 23.00°C. If the balloon is cooled at constant pressure to 5.00°C, what is its new volume?
Answer:
The new volume if the balloon is cooled at constant pressure is 3.98 L
Explanation:
The new volume is calculated using the Charles law formula
that is V1/ T1 = V2/T2 where,
V1 = 4.24 l
T1= 23c into kelvin = 23 +273 =296 K
T2 = 5.00 c into kelvin = 5.00 + 273 = 278 K
V2 = ?
by making V2 subject the subject of the formula by multiplying both side by T2
V2 = V1 xT2/ T1
V2 = (4.24 L x 278 K) / 296 k = 3.98 L
You have 30mL of hot cocoa, but it’s way too sweet. You add hot water until there’s 70mL of hot cocoa and determine that the final molarity is 2M, just the way you like it. What was the initial molarity of hot cocoa?
Answer:
edge sample answer -
Lesson Question: What is the effect of temperature on the solubility of a solid in a liquid?
Explanation:
calculate the number of liters in a solution with a 1.5M and 50 moles
Dr. Steiner and her team have been using GPS to track two plates that are moving toward each other. Which diagram shows what is happening at the place where the plates are moving toward each other?
Answer:
One plate is going underneath the other plate and sinking into soft rock below.
Explanation:
Tectonic plates will move each other to form rocks and mineral layers. The correct diagram which showing the result of two tectonic plates to each is diagram C. One plate is going underneath the other plate and sinking into the soft rock below.
What is plate movement?Earth's lithosphere composed of tectonic plates of different sizes and shapes. These plates move away or each other results in the formation of soft rocks and mineral layers.
The magma inside the mantle of earth crust become hot fluid by convection and it flows out. This flow of magma creates slight movement in tectonic plates finally they move in different directions.
The rocks in earth crust will undergoes weathering and results in sand formation. The boundaries of the tectonic plate will be different in different regions and characteristics of that region depends on the type of boundary such as presence of islands volcanoes etc.
When two tectonic plates moves each other one plate is going underneath the other plate and sinking into the soft rock below. Hence, option C correct.
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Your question is incomplete. But your complete question probably was:
Dr. Steiner and her team have been using GPS to track two plates that are moving toward each other. Which diagram shows what is happening at the place where the plates are moving toward each other?
Diagram A: Two plates are hitting each other, and the plates are breaking into pieces, creating sand.
Diagram B: Two plates are pushing against each other, causing the edges to bend upward.
Diagram C: One plate is going underneath the other plate and sinking into the soft rock below.
Diagram D: One plate is going underneath the other plate and sinking into the ocean below
What is the connection between kinetic energy, temperature, and freedom of movement?
Explanation:
They have a directly proportional relationship.
i.e.
when one of them varies in magnitude, the others will also vary directly.
Quantities expressed as products of each other are always inversely proportional & those expressed as quotients are directly proportional with each other.
KE = 1/2mv^2
Thus, we know that m & v in KE are inversely related.
Inverse proportionality - when m increases, v decreases. & vice versa.
Direct proportionality - when v increases KE also increases
If Temperature increases then the probability of atoms to randomly collide with each other increases rapidly.
the rapidity of these atoms result from the increase in speed(v). since v & KE have a direct r/n ship, KE also increases. as a result the atoms get a relatively high freedom of movement compared to that of those in solids.
2NaOH + H2SO4 --> Na2SO4 + 2H2O
How many moles of H2SO4 are needed to react with 4 moles of NaOH?
4 moles H2SO4
1 moles H2SO4
2 moles H2SO4
3 moles H2SO4
2moles of H₂SO₄ are needed to react with 4 moles of NaOH.
The number of moles present in a compound is the total number of atoms, ions or molecules present in that compound.
Number of moles of any substance
= mass of that substance/molar mass of the substance
1 mole of any substance contains 6.022 × 10²³ number of atoms, ions or molecules. 6.022 × 10²³ is also known as avogadro's number.
The mole ratio of NaOH:H₂SO₄ is 2: 1
Which means that 1mole of H₂SO₄ require 2 moles of NaOH.
Therefore 4 mole of NaOH will require: 4÷2=2 moles of H₂SO₄
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Which statement is true regarding the function of a catalyst in a chemical reaction?.
Answer:
You didn't give any options/statements, so I'm just going to give you context on what catalysts does. Catalysts decrease the activation energy needed, allowing more particles for successful reactions.
I know my colleague tried doing an experiment by using hydrogen peroxide as a catalyst and seeing how rates of reactions were affected. It ended up with a stain on our chemistry lab and him re-doing his entire lab.
