Answer:
b liquid
Explanation:
2H
2
(g)+O
2
(g)⟶2H
2
O(l) is the correction reaction as during formation of water both hydrogen and oxygen are in gaseous form and produces water in liquid form.
The twin Keck Observatory telescopes (pictured) are able to detect
electromagnetic waves with a wavelength of 10 meters. Use the following
electromagnetic spectrum to correctly determine the type of wave the
telescopes detect?
A: visible light
B:Microwave
C:Ultraviolet
D: X -Ray
Answer:
From Hawaii’s Maunakea, astronomers around the world use W. M. Keck Observatory to observe the universe with unprecedented power and precision.
The twin Keck Observatory telescopes are the world’s most scientifically productive optical and infrared telescopes. Each telescope weighs 300 tons and operates with nanometer precision. The telescopes’ primary mirrors are 10-meters in diameter and are each composed of 36 hexagonal segments that work in concert as a single piece of reflective glass.
In the middle of the Pacific Ocean, Hawaii Island is surrounded by thousands of miles of thermally stable seas. The 13,796-foot Maunakea summit has no nearby mountain ranges to roil the upper atmosphere. Few city lights pollute Hawaiian night skies, and for most of the year, the atmosphere above Maunakea is clear, calm and dry -— offering the best seeing on Earth.
Answer:
give them brainliest
Explanation:
What is the [H3O+] in 0.550 molar C6H5COOH?
Given: pKa = 4.19
A. 5.96 × 10-3 molar
B. 9.38 × 10-3 molar
C. 0.76 × 10-3 molar
D. 5.96 × 103 molar
Answer:
A. 5.96 × 10^-3 molar
Explanation:
PLATO
Balance the following equations.
Al4C3 + H2O → Al(OH)3 + CH4
NH3 + O2 → NO + H2O
Answer:
Al4C3 +12 H2O → 4Al(OH)3 + 3CH4
4NH3 + 5O2 → 4NO + 6H2O
What are the two most abundant chemicals in air?
Answer:
The most abundant chemical/gas is Nitrogen, which makes up about 78% and Oxygen at second place with approximately 21%
Answer:
Nitrogen and Oxygen because about 70% of air is nitrogen and around 20% of air is Oxygen.
Hope this helps!
What is the concentration of a 500 mL solution with 25 mol of HF? Write your answer with TWO decimal places and round accordingly. ______M
Answer:
23
Explanation:
The concentration of the solution is given as the ratio of the moles and the volume of the solution. The concentration of hydrogen fluoride is 50 M.
What is molarity?Molarity is the colligative property that is expressed in the terms of the moles of the solute expressed per liter of solution. It is given by the formula:
[tex]\rm Molarity = \rm \dfrac{\text{moles of solute}}{ \text{liters of solution}}[/tex]
Given,
Volume of solution (V) = 0.5 L
Moles of the solute (n) = 25 moles
Molar concentration (M) = ?
Substituting values in the equation we get:
[tex]\begin{aligned} \rm M &= \rm \dfrac{n}{V}\\\\&= \dfrac{25}{0.5}\\\\&= 50\end{aligned}[/tex]
Therefore, 50 M is the concentration of 25 mol Hydrogen fluoride.
Learn more about molarity here:
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some important points for hadpicking
Answer:
Handpicking right?
It is a very simple and easy method of separation. It doesn't require any kind of equipment to proceed. It takes very less time when performed for small quantity of mixture. It doesn't require any kind of preparation
Air in a closed cylinder is heated from 15°C to 36°C. If the initial pressure is 1000 torr, determine what is the final pressure? *
Answer:
1072 torr
Explanation:
To answer this problem we can use Gay-Lussac's law, which states:
P₁T₂=P₂T₁Now we convert the given temperatures into K:
T₁ = 15°C ⇒ 15+273.16 = 288.16 KT₂ = 36°C ⇒ 36+273.16 = 309.16 KWe input the data:
1000 torr * 309.16 K = P₂ * 288.16 KAnd solve for P₂:
P₂ = 1072 torrAn aqueous solution containing 6.06 g of lead(II) nitrate is added to an aqueous solution containing 6.58 g of potassium chloride. Enter the balanced chemical equation for this reaction. Be sure to include all physical states. balanced chemical equation: What is the limiting reactant
Answer:
Pb(NO₃)₂ is the limiting reactant.
The equation is: Pb(NO₃)₂ (aq) + 2KCl (aq) → PbCl₂ (s) ↓ + 2KNO₃ (aq)
Explanation:
We identify our reactants:
Pb(NO₃)₂ → Lead (II) nitrate
KCl → Potassium chloride
Our reaction is:
Pb(NO₃)₂ (aq) + 2KCl (aq) → PbCl₂ (s) ↓ + 2KNO₃ (aq)
1 mol of Lead (II) nitrate reacts to 2 moles of KCl, in order to produce 2 moles of potassium nitrate and 1 mol of slid Lead (II) chloride.
We determine the moles of the reactants:
6.06 g . 1mol /331.2 g = 0.0183 moles of Lead (II) nitrate
6.58 g . 1mol / 74.55g = 0.0882 moles of KCl
2 moles of KCl react to 1 mol of Pb(NO₃)₂
Then, 0.0882 moles of KCl may react to (0.0882 . 1) /2 = 0.0441 moles
We have 0.0183 moles of Pb(NO₃)₂ and we need 0.441 moles. Then, the
Pb(NO₃)₂ is our limiting reactant.
What are the spectators ions in this reaction?
Answer:
Option C. Na⁺(aq) and Cl¯(aq)
Explanation:
From the question given above, we obtained the following:
Na₂SO₄(aq) + CaCl₂(aq) —> CaSO₄(s) + 2NaCl(aq)
Ionic Equation:
2Na⁺(aq) + SO₄²¯(aq) + Ca²⁺(aq) + 2Cl¯(aq) —> CaSO₄(s) + 2Na⁺(aq) + 2Cl¯(aq)
From the ionic equation above, we can see that Na⁺(aq) and Cl¯(aq) are present on both side of the equation.
Therefore, Na⁺(aq) and Cl¯(aq) are the spectator ions because they did not participate directly in the reaction.
What volume, in mL, of 0.100 M NaOH is required to neutralize 35.0 mL of 0.102 M hydroiodic acid HI?
Answer:
35.7 mL NaOH
Explanation:
M1V1 = M2V2
M1 = 0.100 M NaOH
V1 = ?
M2 = 0.102 M HI
V2 = 35.0 mL
Solve for V1 --> V1 = M2V2/M1
V1 = (0.102 M)(35.0 mL) / (0.100 M) = 35.7 mL NaOH
Which element's properties form the basis for all life?
Answer:
carbon
Explanation:
The properties of carbon forms the basis for all life. Explanation: The atoms of carbon are found in the molecules of all living species.
Is this statement true or false?
All gymnosperms lose their leaves in the winter.
Answer:
they do fall off of themselves
Answer:
True!
Explanation:
They usually fall off in the winter
In a 250.0 g sample of ammonium sulfate, how many moles of ammonium ions are present?
Answer:
1.89 mol
Explanation:
in 250 g of ammonium sulfate 1.89 moles are present
The close packing of particles in solids results in
Answer:
Close packing in crystals refers to space efficient arrangement of constituent particles in a crystal lattice. To understand this packing more clearly we have to assume all particles (atoms, molecules and ions) are of the same spherical solid shape. So the unit cell of a lattice is a cubic shape.
Explanation:
Hope it helps! Correct me if I am wrong :>
Im sure about my answer :>
If you dont mind can you please mark me as brainlest?
Determine if each compound shown is soluble or insoluble.
Drag the appropriate items to their respective bins.
The solubility rules shows which compounds are soluble in water.
According to the solubility rules, all chlorides and bromides are soluble in water except those of silver and mercury. This explains why most of the chlorides and bromides are designated as "soluble".
All nitrates are also soluble in water. The hydroxide of copper is not soluble in water as well as the sulfates of divalent group II elements.
In summary, the soluble and insoluble elements are shown as follows;
1) Soluble
FeCl3KNO3KClCu(NO3)2NaClKBr2) Insoluble
BaSO4Cu(OH)2AgClLearn more: https://brainly.com/question/24846690
which of the following is the ether- containing analgesic drug (pain fever reducer) that likely contributed to the death of famous aviator howard hughes
Answer:
Happy Birthday HAHAHAHAHAYAHYAHAHAH
Phenacetin is the ether-containing analgesic drug that is likely to contribute to the death of famous aviator Howard Hughes.
What is phenacetin?It is a drug used for relieving pain and reducing fever.
It was taken off the market as a medicine in the 1970s because it was deemed hazardous.
This was the reason for the death of the famous aviator Howard Hughes.
The chemical formula of [tex]\rm C_1_0H_1_3NO_2[/tex].
Thus, the correct option is C, phenacetin.
Learn more about phenacetin
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I am an element that has 4 valence electrons that are present in my third energy level. Who am I?
Answer:
silicone (Si) is the answer
the lens of the eye is clear so that light can go through.
A. True
B. False
Answer:
true
Explanation:
the clear lens over the eye is called the cornea
1 How many milliliters of a 1.75 M LiCl solution contain 15.2 g of LiCI? (9.4)
Answer:
I dont no ok bye
Thank you
Which of the following has the highest viscosity?
A. Honey
B. Milk
C. Water
D. Oil
The highest viscosity has honey
Answer:
The highest viscosity is honey.
Decreasing the volume of a gas would _______________. A. Decrease the temperature. B. Increase the amount liters. C. Decrease the moles. D. Increase the pressure.
Answer:
D. Increase the pressure.
Explanation:
Okay, lets break this down.
So first, lets imagine what decreasing the volume looks like. I like to think of it as squishing a balloon or water bottle. You condense what's inside it. So, with this in mind, lets look at the question.
A. Decrease temperature:
Does this happen when you squeeze something? It gets colder? No, that's not true. So we can eliminate that one.
B. Increase the liters:
Does this happen when you squeeze something? It gets larger? It takes up more space? No, that's not true. So we can eliminate that one.
C. Decrease in moles:
Okay, so moles is just a fancy way of saying "stuff." So does the amount of "stuff" decrease when you squeeze something? No, it just gets closer together. It's denser. So we can eliminate that one.
D. Increase the pressure:
Now we're getting somewhere!! When you squeeze a balloon, the pressure DOES increase because you are condensing the gas inside it. That's why balloons will pop if you squeeze too hard, the pressure is too great and has to escape. So yes, this is your answer.
Answer: D. Increase the pressure
A student needs 7.6 liters of a 0.18 molar solution for an experiment. How many grams of solute does the student need if the molar mass of the solute is 22.71 g/mol? Round your answer to the nearest 0.01
Answer:
31.07 g
Explanation:
First we calculate how many moles of solute would there be in 7.6 liters of a 0.18 molar solution, using the definition of molarity:
molarity = moles / volume0.18 M = moles / 7.6 Lmoles = 1.368 molNow we calculate the mass of 1.368 moles of solute, using the given molar mass:
1.368 mol * 22.71 g/mol = 31.07 gTake your time please.
1. Dependant Variable
2. Scientific Method
3. Data
4. Consistency
5. Metric Balance
6. Mean
7. Technology
8. Dependant Variable
9. Hypothesis
10. Spring Scale
Explanation:Hello! I hope this helped and please correct me if some are wrong. I did my research and matched them. Have a good one!
(>‿◠)✌Answer:
dependent variablescientific methodDataconsistency metric balancemeantechnologydependent variablehypothesisspring scalehope it is helpful to you
upal.
Consider the elements sodium, aluminium, silicon and sulphur. Which one will form
an oxide that will give a pH of less than 7 when in solution?
Answer:
sodium
Explanation:
this is because sodium is neutral ....hence the pH formed will be 7
The element sodium will form an oxide that will give a pH of less than 7 when in solution.
What is element?Any compound that could be broken down into simpler chemicals by regular chemical processes is referred to as a chemical element.
What is pH?pH is a measurement of how acidic or basic an aqueous solution is in relation to other liquids.
Sodium is neutral in nature that's why the element sodium will form an oxide that will give a pH of less than 7 when in solution.
To know more about pH and element.
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In a circuit that has a total current of 4 amps with 4 lightbulbs wired in parallel, what is the current at each bulb?
Answer: 1 A for each lamps
Explanation: we assume lamps are similar and lamps have same resistance.
Then current is divided according Kirchhoff s law equally to all lamps.
NEED HELP ON THIS NOW PLEASE
Answer:
A. Bees bringing pollen from the flower of one plant to the flower of another plant.
Explanation:
Genetic diversity in organisms is enhanced by the process of sexual reproduction due to the meiotic process that the participant organisms undergo to produce gametes. A process unique to meiosis called CROSSING OVER ensures that the alleles of genes are recombined in the GAMETE or sex cells.
According to this question, POLLINATION, which is the transfer of pollen from a male flower to a female one, will lead to sexual reproduction via fertilization. However, a cross-pollination, which requires a pollinator like the bees in this question will ensure the most genetic diversity among the offsprings.
An element cannot be broken down into other substances by chemical or physical means. But you can still split a sample of an element into smaller pieces. For example, a piece of aluminum foil can be cut in half and then in half again, and all of the pieces will still be aluminum.What do you think will eventually happen if you could continue dividing that piece of aluminum foil
You will reach the smallest possible piece of the aluminum.
You will divide the aluminum into two smaller elements.
You will continue dividing the aluminum forever into smaller and smaller pieces.
You will reach a point at which there is no matter left.
Answer:
You will reach the smallest possible piece of the aluminum.
Explanation:
You will not be able to physically separate the aluminum into two smaller elements; aluminum is already a pure elemental substance. It will not divide forever, at some point it will be as small as you can possibly make it. However, you won't be able to erase the matter completely -- it will just become very very small!
g the following statements as they apply to gas chromatography. Decide if each is true or false. The technique referred to as gas chromatography is actually gas-liquid chromatography since the stationary phase is a liquid adsorbed on the surface of an inert solid. To be separated using GC, analytes must be volatile. An air peak is commonly used to determine the dead time when using a TCD detector. An FID is insensitive to non-combustible gases such as water and carbon dioxide. A column temperature equal to or slightly above the average boiling point of the sample components results in a reasonable elution time.
Answer: To be separated using GC, analytes must be volatile.
An air peak is commonly used to determine the dead time when using a TCD detector.
An FID is insensitive to non-combustible gases such as water and carbon dioxide.
A column temperature equal to or slightly above the average boiling point of the sample components results in a reasonable elution time.
Explanation:
The gas chromatography works on the principle of separation of gaseous substances based on the differences of vapor pressure. The thermal conductivity detector works on the principle of detection of effluents from the has chamber and the air peak gives indication of the retention time of the effluents. Flame ionization detector can be used for the detection of organic compounds but insensitive for the detection of halogens, non-combustible substances like carbon dioxide and water. The temperature of the column is kept higher than the average boiling point of the substance so as to attain separation of substances by the differences in the elution time.
What's the mass in grams of 0.334 moles of sucrose (C12H22O11)?
Answer:
114.23g
Explanation:
Mass = xg
Mole = 0.334 mol
Molar mass of Sucrose
(C = 12, H = 1, O = 16)
C12H22O11
(12×12)+(1×22)+(16×11)
144 + 22 + 176
342g/mol
Mass = No of mole × Molar mass
Mass = 0.334 × 342
Mass = 114.228
Mass ≈ 114.23g
uses of carbon dioxide.
Answer:
hello can you follow me
Explanation:
used in fire extinction, blasting rubber, foaming rubber and plastic
