Answer:
Explanation:
I am sorry but the graph is not given
PLease help I need to get this test done and whoever helps first I will mark brainliest Love you!!!!!
Answer:
moon
Explanation:
Answer:
Explanation:
its the moon. the moon covers the sun causing it to be completely blakened out. and if thats not right then lifes a lie cuz i got blinded pretty bad in one of my eyes for looking at it with it
A spectral line has a wavelength of 7.35 *10-7 m. What is the energy of this radiation?
Answer:
2.7 x 10^-19 J
Explanation:
The formula needed for this problem is
E = hν
where E = energy, h = Planck's constant = 6.626x10^-34 and ν is the frequency
c = λν
where c = speed of light = 3x10^8, and λ = wavelength
3x10^8 = 7.35x10^-7 . ν
ν = 4.08 x 10^14 Hz
E = 6.626x10^-34 . 4.08x10^14 = 2.7 x 10^-19 J
A student adds 200.0g of C7H6O3 to an excess of C4H6O3, this produces C9H8O4 and C2H4O2. Calculate the percent yield if 231 g of aspirin (C9H8O4) is produced in an experiment.
___C7H6O3 + ___C4H6O3 ___C9H8O4 + ___C2H4O2
Answer:
Percent yield = 88%
Explanation:
Given data:
Mass of C₇H₆O₃ = 200.0 g
Actual yield of aspirin = 231 g
Percent yield = ?
Solution:
Chemical equation:
C₇H₆O₃ + C₄H₆O₃ → C₉H₈O₄ + C₂H₄O₂
Number of moles of aspirin:
Number of moles = mass/molar mass
Number of moles = 200.0 g/ 138.12 g/mol
Number of moles = 1.45 mol
Now we will compare the moles of aspirin with C₇H₆O₃.
C₇H₆O₃ : C₉H₈O₄
1 : 1
1.45 : 1.45
Theoretical yield of aspirin:
Mass = number of moles × molar mass
Mass = 1.45 g × 180.158 g/mol
Mass = 261.23 g
Percent yield:
Percent yield =( actual yield / theoretical yield )× 100
Percent yield = (231 g/ 261.23 g)× 100
Percent yield = 0.88 × 100
Percent yield = 88%
Before we can use gasoline in our cars, the crude oil needs to be separated into separate products like plastics and ink. This process is called
Answer:
Fractional distillation
Explanation:
Crude oil, also known as petroleum, is a naturally occurring substance found in the Earth's crust. It is a mixture of different useful substances. These substances are separated from one another based on their individual boiling points in a process called FRACTIONAL DISTILLATION.
The process of fractional distillation entails the application of heat to the crude oil. The different fractions evaporate and condense in the fractionating column depending on their boiling point. The hydrocarbon substances separated are called fractions, and they include bitumen, diesel, kerosene, gasoline, natural gas etc. Therefore, before we can use gasoline (petrol) in our cars, the crude oil needs to be separated into separate products like plastics and ink. This process is called FRACTIONAL DISTILLATION.
How many moles of water are needed to react to produce 5.0 moles of sodium hydroxide?
*Your answer should be written as XX
Na2O + H20 --> 2 NaOH
Answer:
2,5
Explanation:
Solution at attachment box
Producted or consumed material proportional with coefficient of material at reax.
Which of these substances are most likely crystalline solids? Select all that apply.
Answer:
you did not show the options
Explanation:
I am unsure if this is the correct question, but I think these are the answer choices that are part of this question:
O diamond
O sugar
O rubber
O salt (NaCl)
O wood
O ice
O flour
The answers to this question are diamond, sugar, salt (NaCl), and ice (1st, 2nd, 4th, and 6th options).
The picture shows two lightbulbs powered by a solar cell. Describe the
energy transfers that make the bulbs light, starting with energy from the
Sun.*
Answer:
light energy --> electric energy ----> light and heat energy by the bulb
Explanation:
The energy transfers that make the bulbs light, starting with energy from solar energy to electrical energy and from electrical energy to heat & light energy.
What is energy transfer?Transfer of energy is a process in which one form of energy will convert into other form of energy, and total energy during this conversion is conserved. When the solar energy comes from the Sun and falls on the solar panel, then PV cells that are present in the panel will absorb this solar energy and generate electrical charge. This electrical charges are responsible for the flow of internal electricity inside the cell.This generated electricity used by the bulbs to generate light energy as well as heat energy.
Hence, Solar energy will convert in to electrical energy which in turn converts into light and heat energy.
To know more about conservation of energy, visit the below link:
https://brainly.com/question/166559
Where does the chemical energy to produce ATP come from
Answer:
glucose
Explanation:
Chemical energy is stored in the bonds that hold the molecule together. ADP can be recycled into ATP when more energy becomes available. The energy to make ATP comes from glucose. Cells convert glucose to ATP in a process called cellular respiration.
The chemical energy to produce ATP comes from the BREAKDOWN of carbon-based molecules into smaller molecules.
Cellular respiration is a series of metabolic reactions by which eukaryotic cells produce energy in the form of ATP by using the energy stored in the chemical bonds of carbon-based molecules.These reactions are catabolic reactions in which chemical bonds of larger molecules are broken down, thereby releasing energy. These carbon-based molecules are glucose and fats (lipids).Carbohydrates release 4000 calories (cal) per gram when they are burned during cellular respiration.Conversely, fats (lipids) release approximately 9000 cal per gram when they are burned.In conclusion, the chemical energy to produce ATP comes from the BREAKDOWN of carbon-based molecules into smaller molecules.
Learn more in:
https://brainly.com/question/10253095
Give the proper name for this compound formula, O2^2-:
A.) Oxide
B.) Oxygen
C.) Oxate
D.) Peroxide
Answer:
b
Explanation:
THE ANSWER B!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
PLEASE HELP!!!
Mixed Naming Worksheet – Ionic, Covalent and Acids
Directions: Be sure to determine what type of compound your substance is – ionic, binary, covalent or an acid. Naming Compounds
1. NO2 - Covalent
2. NaBr - Ionic
3. SiO2 -
4. P2Br4
5. FeSO4
6. SF6
7. HNO3
8. Li2S
9. HCl
10. MgBr2
It has been windy in Wren’s town. Wren wants to know how fast the wind is moving. Which tools could he use?
Answer:
We can use a fan, divide the number of times that fan spins by the time it takes and the speed is obtained
HELP, PLEASE please please!
Brainliest, AND I'll post FREE 50 points.
I don't have time to learn the new topic! Easy chemistry! My mom will kill me if I don't. Please answer the following topics about the compound in the picture.
Electronic Geometry
Molecular Geometry
Polarity
Intermolecular Forces
Compound Name - I think its hydrobromic acid
Answer:
Electronic Geometry is Linear
Molecular Geometry is Linear
Polarity of HBr is indeed a polar molecule
Intermolecular Forces of HBr is a Dipole-Dipole Forces
Compound Name : Hydrogen Bromide
Explanation:
It is linear because it only has 2 atom that is obvious forming a linear species with bond angle of 180°
It is polar molecule because Br has higher electronegativity than hydrogen therefore produce a difference in electronegativity that proves HBr to be a polar molecule.
Intermolecular Forces is dipole-dipole because there is a dipole moment due to the difference in electronegativity with Br having the negative partial charge -δ and H having the positive partial charge +δ.
Answer:
hyrdrobormic acid
Explanation:
can someone just plz answer the question I just posted there is no time please
Answer:
yes
Explanation:
were is it
Help Plzz Will give all points
Answer:
reqirured mediem
Explanation:
Answer:
reqirure a mediem
Explanation:
How many atoms of fluorine are in 5.6x10^22 molecules of MgF2
Answer:
1.12x10²³ atoms of F
Explanation:
A molecule is a group of 2 or 3 atoms that are bonded by electrostatic charges.
In 1 molecule of MgF2 there are 2 atoms of fluorine and 1 atom of magnesium.
Thus, there are 2 atoms of fluorine per molecule of MgF2. In 5.6x10²² molecules:
5.6x10²² molecules MgF2 * (2 atoms Fluorine / 1 molecule MgF2) =
1.12x10²³ atoms of FHelium (He) and neon (Ne) are elements in Group 8A of the periodic table. How do the electron dot diagrams of these elements compare?
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
The electron dot diagram of helium has eight fewer dots than the electron dot diagram of neon.
Both the electron dot diagram of helium and the electron dot diagram of neon have two dots.
Both the electron dot diagram of helium and the electron dot diagram of neon have eight dots.
Answer:
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
Explanation:
Answer:
Answer:
The electron dot diagram of helium has six fewer dots than the electron dot diagram of neon.
Explanation:
Explanation:
which state of matter has the highest kinetic energy
Answer:
gases
Explanation:
Their atoms are the least far apart
HELP PLEASE
Which expression is equivalent to (5x^3)(2x)^2 ?
A 10x^6
B 30x^6
C 40x^6
D 1,000x^12
Answer:
C
Explanation:
Which has the higher average temperatures, white dwarfs or supergiants?
Answer:
White dwarfs are hotter
Explanation:
How does electroplating use electrolysis
Answer:
Electroplating is the process that uses electric current to reduce dissolved metal ions by the use of electrolysis, to obtain the dissolved metal ions at the other electrode, mostly in the format of a uniform coating.
Use Boyle's Law to solve this problem: A gas has a volume of 10.0 L at a pressure of 4.0 atm. If the gas expands to 20.0 L, what will be the new volume, assuming that there is no change in moles or temperature.
Answer:
P₂ = 2 atm
Explanation:
Given data:
Initial volume = 10.0 L
Initial pressure = 4.0 atm
Final volume = 20.0 L
Final pressure = ?
Solution:
The given problem will be solved through the Boly's law,
"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"
Mathematical expression:
P₁V₁ = P₂V₂
P₁ = Initial pressure
V₁ = initial volume
P₂ = final pressure
V₂ = final volume
Now we will put the values in formula,
P₁V₁ = P₂V₂
4.0 atm × 10.0 L = P₂ × 20.0 L
P₂ = 40.0 atm. L/ 20.0 L
P₂ = 2 atm
3. What is physical science mainly about? *
the relationship between matter and energy
O the relationship between matter and light
the relationship between molecules and matter
O the relationship between light and energy
PLZ HELP!!
Answer: D
Explanation: Physical science is the study of the inorganic world. That is, it does not study living things. (Those are studied in biological, or life, science.) The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.
What is the percentage of each element? Mg(NO3)2
Please give an explanation!!
Answer:
Magnesium (Mg) is 1, Nitrogen is 2, and Oxygen is 6
Explanation:
the reason Nitrogen is 2 and Oxygen is 6, is because the number after the parenthesis means you have multiple whatever is inside the parenthesis by that number.
how can we tell a piece of metal is hot
Answer:
touch it :)
Explanation:
Answer: I Believe The answer to this question is to hover your hand over the piece of Metal, life what'd you do in a house fire to tell if the doorknob is hot.
Explanation:
Why is Mm02 called manganese (IV) oxide?
Answer:
MnO2 M n O 2 is an ionic substance without any oxo-anions, therefore its name has the -ide ending.
If the molecules of two different substances have a similar size but the molecules of one substance are polar while the molecules of the other substance are nonpolar, what is most likely true about the substances? The polar substance has a lower boiling point than the nonpolar substance. The nonpolar substance has a lower boiling point than the polar substance. Both substances have similar volatilities. Both substances have similar solubilities.
Answer:
The nonpolar substance has a lower boiling point than the polar substance
Explanation:
What causes polarity is how the electrons of the molecules in each substance are being shared. To have a polar substance/molecule it means that the electrons are not equally shared and when there is non-polar molecule we have that the electrons are shared evenly.
For instance, let's say we have a chemical Compound AB. If AB is polar it means that the electrons here are not evenly distributed, thus we will have one of the molecules to be positive and the other to be negative, say A^- and B^- = A^-B^-. Hence, they have polar bonds.
The bonds in polar substance are stronger than the one in non polar substance thus we have lower boiling point in non-polar substance(the bonds are held together by weak forces) and a high boiling point in a polar substance.
Answer:
B.) The nonpolar substance has a lower boiling point than the polar substance
Explanation:
edge 2021
what is part of the modern atomic model but no previous model.
A) a nucleus
B)circular electron paths
C)A positive particle
D) electron clouds
Answer: D
Explanation:
I don’t have an explanation. I got the answer wrong, I put “Circular electron paths”, when really it’s Electron Clouds.
Answer:D : Electron Clouds
Explanation:
is defined mathematically, describing a region with a high probability of containing electrons
How many molecules
are there in 220 grams
of CF.?
Answer:
Answer. There are 1.5×1024 molecules in 220 g CF4 .
Molar mass
18 Calculate the molar mass of lead element, knowing that the mass of 0.2 mol
of it equals 41.4 g
Answer:
207g/mol
Explanation:
Given parameters:
Mass of the lead = 41.4g
Number of moles = 0.2mole
Unknown:
Molar mass of lead = ?
Solution:
The molar mass of substance is related to mass and number of moles using the expression below;
Mass = number of moles x molar mass
Molar mass = [tex]\frac{mass}{number of moles }[/tex]
Now insert the parameters and find the molar mass;
Molar mass = [tex]\frac{41.4}{0.2}[/tex] = 207g/mol
The lead pipe has a mass of 200 g, how much will be left after 6 months?
Answer:
33g
Explanation:
200 divided by 6=33.33