Answer: Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix. These sources originate mostly in our local star, the Sun. Electricity falls into its own category because it's an energy carrier and not a primary source.
Explanation:
Answer:
Our primary energy source is fossil fuels, with nuclear power and renewable energy sources rounding out the mix. These sources are mostly derived from our nearest star, the Sun. Electricity is classified separately because it is an energy carrier rather than a primary source.
Explanation:
I had that question before it was hard good luck :D
5 points
12. How many liters of a 4.2 Molar solution of NaCl are needed to make
352 grams of AICI3? *
O A. 0.186 liters
B. 1.86 liters
C. 18.6 liters
D. 352 liters
Moles of AlCl_3
[tex]\\ \tt\hookrightarrow \dfrac{352}{133}=2.64mol[/tex]
Now
Molarity=Moles of solute/Volume of solution in L[tex]\\ \tt\hookrightarrow 4.2=\dfrac{2.64}{V}[/tex]
[tex]\\ \tt\hookrightarrow V=0.62L[/tex]
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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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:
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 ⊙_⊙
Collisions covalent bonding level 16!!!
Answer:
Group 16 elements tend to form two covalent bonds because they have six valence electrons and need two more to have eight. Oxygen is a group 16 element, and it can gain the same electron configuration as neon if it makes two covalent bonds. It tends to form either two single covalent bonds or one double covalent bond.
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.
Martin works in a crime lab, and his job is to create the finished sketches of each crime scene. What does his job MOST likely entail?
A. He uses computer programs to create a detailed representation of the scene,
B. He takes video of every crime scene and turns the video into a drawing
C. He takes a rough sketch and uses his own artistic skill to draw it more clearly
D. He interviews witnesses to make sketches of possible suspects in a crime.
Answer:
C. He takes a rough sketch and uses his own artistic skill to draw it more clearly
Martin works in a crime lab, and his job is to create the finished sketches of each crime scene. So, He uses computer programs to create a detailed representation of the scene, which is option A.
Martin's job as a crime scene sketch artist most likely entails using specialized computer programs to create detailed and accurate representations of the crime scenes. These programs allow him to accurately depict the dimensions, measurements, and key features of the crime scene. It provides a more precise and professional output compared to traditional hand-drawn sketches. The correct answer is option A.
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is the release of CO2 proof for a chemical reaction?
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.
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.
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.
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?.
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.
What is redox in terms of electrons? Give an example.
1. Do you think that Tyrone Briggs might be a victim of false identification? Why or why not?
2. What factors are present that make the witnesses reliable?
3. What factors are present that make the witnesses unreliable?
This is a scenario which happens when someone incorrectly thinks that they have found or recognized a particular person.
In the case of Tyron Briggs he may have been falsely identified as a result of lack of substantial evidence pinning him to the crimes.
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By definition, what type of fatty acid has double bonds?.
Answer:
Fatty acids are comprised of hydrocarbon chains terminating with carboxylic acid groups. Fatty acids and their associated derivatives are the primary components of lipids. The length and degree of saturation of the hydrocarbon chain is highly variable between each fatty acid, and dictates the associated physical properties (e.g., melting point and fluidity). Moreover, fatty acids are responsible for the hydrophobic properties (insoluble in water) exhibited by lipids.
Function of Fatty Acids
Explanation:
The type of fatty acids that have double bonds is unsaturated fatty acids.
What are unsaturated fatty acids?
Unsaturated fat is a fatty acid containing two carbons that share a double or triple bond and are not entirely saturated with hydrogen atoms. The structures are weaker and often liquid (oil) at room temperature as a result of the lower hydrogen-bond saturation.
Vegetables and fish are more likely to contain unsaturated fats than other foods. In contrast, saturated fats are solid at room temperature and are often present in animal products.
The human body relies on unsaturated fats as a major source of calories and, consequently, energy. Fats are the most concentrated source of energy in food and are typically composed of carbon, hydrogen, and oxygen.
The three primary nutrients in a diet are carbohydrates, proteins, and fats. According to how many hydrogen bonds they contain, fats are classified as either saturated (all hydrogen bonds) or unsaturated (not all hydrogen bonds).
Therefore, unsaturated fatty acids have double bonds.
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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
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!!
What is the volume of a solution that has a specific gravity of 1. 2 and a mass of 185g.
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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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
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.
how many atoms of hydrogen does 6CO2 + 6H2O have
Answer:
There are 12 atoms of hydrogen.
Explanation:
In 6H₂O there are 6 molecules of water. It has 2 hydrogens in each one. You multiply 2 by 6 and get 12 atoms of hydrogen in total.
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
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.
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.
Pressure is caused by __________ within the container.
comman factors that can lead to high blood pressure include.