Answer: There are 4.8 x 1024 hydrogen atoms in 2.0 moles of CH4
Answer:
There are 4.8 x 1024 hydrogen atoms in 2.0 moles of CH4 .
Explanation:
What lens could get dirty with oil if you move the revolving nosepiece in the wrong direction after viewing under oil immersion?.
From what we know, we can confirm that doing this may dirty and cause harm to your 40x lens.
Why would this cause harm to your lens?Oil immersion is a technique that can be quite handy when attempting to view hard-to-see specimens. However, This should be done only with lenses that are made specifically for this, so revolving the nosepiece in the wrong direction will expose the 40x lens to the oil, for which it is not designed, and may cause harm to the equipment.
Therefore, we can confirm that the 40x lens could get dirty with oil if you move the revolving nosepiece in the wrong direction after viewing it under oil immersion.
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What is the risk in filling chemical waste containers past the recommended level?.
Answer:
Overflowing waste containers can lead to drips of potentially hazardous chemicals down the sides. Chemicals and their vapors need room to expand in case of increased temperatures.
separate- Invertebrates and vertebrates
Snail
Earthworm
Cockroach
Butterfly
Snake
Answer:
Snail- Invertebrates
Earthworm- Invertebrates
Cockroach- Vertebrates
Butterfly-Vertebrates
Snake- Invertebrates
Explanation:
I don't know
0. 75 moles of hf and 1. 00 mole of naf were added to 1. 00 l of water. To this solution was added 0. 200 mol of naoh. What was the final ph of the solution?.
NAME DATE BELL GAS PROBLEMS VLAR VOLUME PROBLEMS 1. A sample of gas contains 4.52 moles at STP. What volume would this occupy? 2. If you have 76.9 g of NO2, whal volume would this occupy at STP? 3. A sample of O2 gas occuples 4.6 L at STP. How many atoms are in the sample? 4. A sample of gas has a volume of 39.4 L at STP. How many moles is this? GAS LAWS 5. A gas has a volume of 225 L at STP. Assuming there is no change in pressure, what volume will the gas have if the temperature increases to 75º C? 6. A gas has a volume of 420 L at STP. Assuming there is no pressure change, what volum a will the gas occupy if the volume changes to 350 L?
Answer:
See attached image. The last problem was a challenge, but I can guarantee that it is the teacher's fault if I'm not correct.
Explanation:
On the attachment. Remember that all gasses occupy 22.4 liters at STP. It is a good constant to memorize. It often comes up in chemical calculations, and you can also use it at parties if you want to annoy anyone. Also, depend on the units to help you decide how to do a calculation. moles/liter or liters/mole: it makes a difference in whether you multiply or divide. Use the operation that cancels the units you don't want and leaves the target unit.
40 POINTS!!!! PLEASE HELP
Answer:
after solving this you can get 40 points.
Do you think we can use flame tests to identify unknown metals in a mixture?
Flame tests are used to identify the presence of a relatively small number of metal ions in a compound. Not all metal ions give flame colors. For Group 1 compounds, flame tests are usually by far the easiest way of identifying which metal you have got.
10.
What are the products of a neutralization reaction?
an acid and a base
a salt and water
a salt and an acid
water and a base
STOP DELETING THIS IT IS A CHEMISTRY QUESTION
Answer:
a salt and water is the answer.
What correctly describes the relationship between the spectrum of one atom and the spectrum of another?.
Answer:
There is an intimate connection between the atomic structure of an atom and its spectral characteristics. Atoms of individual elements emit light at only specific wavelengths, producing a line spectrum rather than the continuous spectrum of all wavelengths produced by a hot object.
Explanation:
Which statement describes chromosomes? 27 points
coiled threads of DNA
a spiral molecule
simple chemicals which link the strands
none of the above
Answer:
coiled threads of DNA
Explanation:
Chromosomes are long stretches of DNA packed together by proteins.
Which type of rock does B represent?
A. Igneous rock
B. Metamorphic rock
C. Rock formed by compaction
D. Rock formed by heat and pressure
Answer:
A. because it came from a volcano
Explanation:
Answer: Igneous rock is formed by the melting and cooling of magma or lava.
Inside of Earth, magma slowly cools, creating rock with an irregular or rough texture and large crystals. Magma cooling inside Earth creates intrusive igneous rock.
Outside of Earth, lava cools very quickly, creating rock with a fine, grainy look or texture and small crystals. Lava cooling outside of Earth creates extrusive igneous rock.
Examples: granite, basalt, and pumice
Please help 25 points!!!
Answer:
solve this and get 25 points.
sodium is a metal give reason
Answer:
Because it exhibits metallic qualities, conducts electricity, and heats well, sodium is classified as a metal. Further, its structure is held together by so-called metallic bondings, which means that each atom contributes some electrons to the metal's electron cloud.
Explanation:
Answer:
Soduim is a metal because,sodium is a chemical element with the symbol Na (from Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal. I hope this helps ⊙_⊙
what role do guanacos play in the
Grasses and plants are producers, guanacos are herbivores and are primary consumers and pumas are predators and secondary consumers
Hi! I’m so confused… what is the spin quantum number?? :0
Answer:
5 on k-12 that's the answer
Explanation:
Explanation:
nah so easy
it's a direction of electron spinning in the shell
+½ means electron spinning in clockwise direction
-½ means electron spinning in anticlockwise direction
Which of the following best explains the difference in the solubility in water of the alcohols listed in the table
Answer:i do not know can i get brainliest im broke
Explanation:
brainliest please
The solubility of the alcohols in water increases as the number of hydrogen bonds they can form with water increases.
What is solubility?A solution consists of a solute and a solvent. See the saltwater example to understand the difference between the two. Water is a solvent because it is a substance used to dissolve solutes.
Salt is a solute because it is a substance dissolved in water. Solvents tend to be more abundant in solution. Solution can exist in the form of all three states of matter.
Solubility is the ability of a solute to dissolve in a solvent to form a solution. This is the nature of dissolving sugar molecules and the like in coffee. Water is known as the "universal solvent" because it can dissolve most substances, but there are some exceptions.
Solubility forms new bonds between solute and solvent molecules. It is the maximum concentration of a solute that will dissolve in a solvent of known concentration at a given temperature.
Therefore, The solubility of the alcohols in water increases as the number of hydrogen bonds they can form with water increases.
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help! please! hurry! I will mark brainliest if you get it correct!! NO SPAM!!!!!!
The wavelength of green light is 522 nm. What is the frequency of this radiation
Answer: 5.747 * 10^14 Hz
Explanation:
Convert 522nm to m = 522 * 10^-9 m (since 1nm=10^-9m)
If c = wavelength * frequency, where c is the speed of light (3.0 * 10^8 m/s), then you can manipulate the equation to solve for frequency (f).
f = c / wavelength
Plug in the given numbers:
f = (3.0 * 10^8) / (10^-9)
f = 5.747 * 10^14 Hz
Answer:
The wavelength λ is the distance between successive peaks in a wave. The frequency f of a wave is the number of complete waves that pass a point in a given time. where c is the speed of light. In your case, λ = 522 nm = 522 × 10⁻⁹ m and c = 2.998 × 10⁸ m·s⁻¹
Explanation:
What would happen if the amount of sodium azide used was far greater or far less thanIts 1424 grams of sodium azide which is required to produce 736 L of Nitrogen gas with the density of 1.25 g/LIts
Based on the stoichiometry of the reaction, If the mass of sodium azide used was far greater than 1424 g, the volume of nitrogen gas produced will be far greater than 736 L.
However, If the mass of sodium azide used was far less than 1424 g, the volume of nitrogen gas produced will be far less than 736 L.
What is sodium azide used for?Sodium azide is the chemical found in automobile airbags.
Automotive air bags inflate when an electrical charge triggered by automobile impact causes sodium azide, NaN3, to rapidly decompose to its component elements, nitrogen gas and sodium
The equation of the reaction is given below:
2 NaN3(s) → 2 Na(s) + 3 N2(g)According to the equation of reaction, 2 moles of sodium azide produces 3 moles of nitrogen gas.
1 mole of Nitrogen gas has a volume of 22.4 L
Molar mass of sodium azide is 65 g
Moles of sodium azide in 1424 g = 1424/65 = 21.9077 moles
21.9077 moles of sodium azide will produce 21.9077 * 3/2 moles of nitrogen gas = 32.86 moles of nitrogen gas
32.86 moles of nitrogen gas will occupy a volume of 32.86 * 22.4 = 736 L
If the mass of sodium azide used was far greater than 1424 g, the volume of nitrogen gas produced will be far greater than 736 L.
If the mass of sodium azide used was far less than 1424 g, the volume of nitrogen gas produced will be far less than 736 L.
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What is the relationship between absorbance and transmittance of a sample in a spectrophotometer?
- indirect
- Direct
- No relationship
Plz help!! Plz!!
Consider a mixture of oil and water. What terms would you use to describe this mixture? Check all that apply. Heterogeneous homogeneous immiscible miscible.
Answer:
Its A and C
Explanation:
A mixture of oil and water is:
Heterogeneous
immiscible
What type of mixture of oil and water is?The water molecules attract each other, and the oil molecules stick together. That causes oil and water to form two separate layers. Water molecules pack closer together, so they sink to the bottom, leaving oil sitting on top of the water. The mixture can be called as Emulsion. It is an immiscible liquid and the mixture is heterogeneous as oil floats on top of water surface but do not mix with it.
Thus, correct options are Heterogeneous and immiscible.
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Photosynthesis is the reaction by which green plants convert water and carbon dioxide into glucose and oxygen using sunlight (radiant energy).
The chemical equation for photosynthesis is below.
6CO2 + 6H2O + sunlight energy ——> C6H1206 + 602
What evidence can you provide that shows photosynthesis is an endothermic reaction?
Answer:
Photosynthesis is considered an endothermic reaction, because during the process of photosynthesis, energy from the sun or sunlight is being absorbed.
Explanation:
Any chemical reactions that absorb heat energy from the surroundings to form products is termed the endothermic reaction.
What temperature particles have a high kinetic energy
Particles at the same temperature have the same average kinetic energy, so argon and nitrogen, which are at 20°C, are the gases with the lowest average kinetic energy. Nitrogen and helium, at 100°C, have the highest average kinetic energy because they have the highest temperature.
What’s are the 3 general functions of the nervous system
Answer:
sensory input, integration, and motor output.
Explanation:
The nervous system has three overlapping functions based on sensory input, integration, and motor output. At a more integrative level, the primary function of the nervous system is to control and communicate information throughout the body.
Explain the difference between filtration and decantation.
Answer: Filtration: Method and Examples. Filtration can be described as an act or process of filtering or cleaning something.
Decantation: Method and Examples.
Summary of the difference between Filtration and Decantation: Filtration uses multiple surfaces to filter a substance while decantation doesn’t use a medium, especially a multiple-layered one.
Explanation: I hope this helps you im sorry you had to wait long
Pressure is caused by __________ within the container.
comman factors that can lead to high blood pressure include.
Is satellite travels in a circle at 100 m/s. Compare satellite speed and velocity.
Explanation:
Speed is scalar and velocity is vector.
The speed of satellite is fixed as size 100m/s but
the velocity will be changed per second because satellite moves in a circle and its direction changes correspondingly.
PLEASE HELP FAST !
Calculate the mass in grams of each of the following . 2.0•10^23 gold atoms 1.5•10^23 lead atoms 7.9•10^21 uranium atoms
Answer:
2.0 x 10²³ atoms Au = 65.4g
1.5 x 10²³ atoms Pb = 51.6g
7.9 x 10²¹ atoms U = 3.1g
Explanation:
We want to convert each to grams.
We can use dimensional analysis to do so.
Kindly view the attached image for work.
1.) 2.0 x 10²³ atoms Au
Needed conversions:
1 mole = 6.022 x 10²³ atoms 1 mole of Au = 196.966gMath: (2.0x10²³atoms)/(6.022x10²³atoms) x 196.966g = 65.4g
2.) 1.5 x 10²³ atoms lead
Needed conversions:
1 mole = 6.022 x 10²³1 mole Au = 207.2gMath: (1.5x10²³atoms)/(6.022x10²³atoms) x 207.2g = 51.6g
3.) 7.9 x 10²¹ atoms U
Needed conversions:
1 mole = 6.022 x 10²³ atoms1 mole = 238.029gMath: (7.9x10²¹atoms)/(6.022x10²³atoms) x 238.029g = 3.1g
system of equations You and your friend are making 30 liters of sodium water. You have liters of 10% sodium and your friend has liters of 22% sodium. How many of your liters and how many of your friend's liters should you mix to make 30 liters of 15% sodium
Answer:
X liters of 10% + (30 - x) liters of 22% = 30...
Many forensic scientists remain working in a lab while evidence is collected by police officers.
A.
True
B.
False
Answer:
True
Explanation:
Document and photograph the evidence. Properly secure the evidence by placing it in a paper bag or envelope. Close, seal, or tape the paper bag or envelope. The examiner must initial, date, and time across the sealed area. Label the bag or envelope with the patient's identifying information.
Also, I took the quiz :)
What is the volume of a solution that has a specific gravity of 1. 2 and a mass of 185g.