Answer:
c i think
Explanation:
How many molecules are shown in the chemical formula pictured? H3PO4
A) 1
B) 3
C) 4
D) 7
Answer
A(1)
Explanation:
If you don't see a coefficient, which is the big number in front of the formula, then it's only one molecule.
Example of coefficient
4H3PO4
What is the energy of light with a wavelength of 697 nm?
Answer:
Red 697 nm
384thz-468 the
1.59ev-1.94ev
255zj-310zj
Hopefully I answer yre question
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of electromagnetic wave is 2.81×10⁻¹⁹J.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other.
Mathematically the relation between energy wavelength and speed of light is
E=hc/λ
where,
E = energy of electromagnetic wave=?
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave =697 nm=697×10⁻⁹m
Substituting the values
E= (6.67×10⁻³⁴×3×10⁸)÷697×10⁻⁹m
E=2.81×10⁻¹⁹J
Thus the energy of electromagnetic wave is 2.81×10⁻¹⁹J.
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What is the final concentration of a solution prepared by adding water to 50.0 mL of 1.5 M NaOH to make 1.00 L of solution? a) 0.075 M b) 1.5 m c) 7.5 M d) 30 M e) 0.030 M
Answer:
The final concentration of the solution is 0.075 M (option a)
Explanation:
Dilution consists of reducing the concentration of solute in solution, simply adding more solvent to the solution. In other words, dilution is the procedure for preparing a less concentrated solution from a more concentrated one, and it simply consists of adding more solvent.
In a dilution it is fulfilled:
Vi * Ci = Vf * Cf
where Vi is the initial volume, Ci is the initial concentration, Vf is the final volume and Cf is the final concentration.
In this case:
Vi= 50 mL= 0.05 L(being 1,000 mL= 1 L)Ci= 1.5 MVf= 1 LCf= ?Replacing:
0.05 L* 1.5 M= 1 L* Cf
Solving:
[tex]Cf=\frac{0.05 L*1.5 M}{1 L}[/tex]
Cf= 0.075 M
The final concentration of the solution is 0.075 M (option a)
A sample of He at 25C and 755 torr occupies a fixed volume of 16.8L. What mass of He must be pumped in to increase the pressure to 1.87 atm if the temperature remains the same?
Answer:
2.4 g
Explanation:
Step 1: Given data
Initial pressure (P₁): 755 torrVolume (V): 16.8 LTemperature (T): 25 °CFinal pressure (P₂): 1.87 atmStep 2: Convert "P₁" to atm
We will use the conversion factor 1 atm = 760 torr.
755 torr × 1 atm/760 torr = 0.993 atm
Step 3: Convert "T" to K
We will use the following expression.
K = °C + 273.15
K = 25°C + 273.15 = 298 K
Step 4: Calculate the initial number of moles of He
We will use the ideal gas equation.
P₁ × V = n₁ × R × T
n₁ = P₁ × V/R × T
n₁ = 0.993 atm × 16.8 L/(0.0821 atm.L/mol.K) × 298 K
n₁ = 0.682 mol
Step 5: Calculate the final number of moles of He
We will use the ideal gas equation.
P₂ × V = n₂ × R × T
n₂ = P₂ × V/R × T
n₂ = 1.87 atm × 16.8 L/(0.0821 atm.L/mol.K) × 298 K
n₂ = 1.28 mol
Step 6: Calculate the moles of He added
n = n₂ - n₁
n = 1.28 mol - 0.682 mol
n = 0.60 mol
Step 7: Convert "n" to mass
The molar mass of He is 4.00 g/mol
0.60 mol × 4.00 g/mol = 2.4 g
Is F2 and atom or a molecule and is it a pure element or a
compound?
a. Atom, Compound
b. Molecule: Compound
c. Molecule, Pure element
Answer:
Answer : C Molecule, Pure Element
1. A cyclist accelerates from 7 m/s to 11 m/s in two seconds. What is his acceleration?
m/s/s
Answer:
[tex]\boxed {\boxed {\sf 2 \ m/s^2}}[/tex]
Explanation:
Acceleration can be found by dividing the change in velocity by the time.
[tex]a=\frac{v_f-v_i}{t}[/tex]
The final velocity is 11 meters per second and the initial velocity is 7 meters per second. The time is 2 seconds.
[tex]v_f=11 \ m/s\\v_i=7 \ m/s\\t= 2 \ s[/tex]
Substitute the values into the formula.
[tex]a=\frac{11 \ m/s-7 \ m/s}{2 \ s}[/tex]
Solve the numerator.
11 m/s - 7 m/s = 4 m/s[tex]a=\frac{4 \ m/s}{2 \ s}[/tex]
Divide.
[tex]a= 2 \ m/s/s[/tex] or [tex]a= 2 \ m/s^2[/tex]
The acceleration of the cyclist is 2 meters per second squared.
It took 2.35 min with a current of 2.12 A to plate out all the silver from 0.250 L of a solution containing Ag . What was the original concentration of Ag in the solution
Answer:
concentration of Ag = 1.34 g / L .
Explanation:
Quantity of charge = 2.35 x 60 x 2.12 = 298.92 coulomb.
equivalent weight of silver = 108 g .
96500 coulomb deposits 108 g of silver
298.92 coulomb will deposit 108 x 298.92 / 96500 g
= .3345 g . of silver .
.250 L contains .3345 g of silver
1 L contains .3345 x 4 = 1.34 g
concentration of Ag = 1.34 g / L .
In a mixture of He, O, and N, gases He exerts a partial pressure of 15.22 mm Hg and
the partial pressure of O, is 35.21 mm Hg. What is the partial pressure of N, if the total
pressure is 88.91 mm Hg.
Answer:
P(N) = 38.48 mmHg
Explanation:
Given data:
Partial pressure of He = 15.22 mmHg
Partial pressure of O = 35.21 mmHg
Partial pressure of N = ?
Total pressure = 88.91 mmHg
Solution:
According to Dalton law of partial pressure,
The total pressure inside container is equal to the sum of partial pressures of individual gases present in container.
Mathematical expression:
P(total) = P₁ + P₂ + P₃+ ............+Pₙ
Now we will solve this problem by using this law.
P(total) = P(He) + P(O) + P(N)
88.91 mmHg = 15.22 mmHg + 35.21 mmHg + P(N)
88.91 mmHg = 50.43 mmHg + P(N)
P(N) = 88.91 mmHg - 50.43 mmHg
P(N) = 38.48 mmHg
Which Two process is it Giving brainliest 100 points
Answer:
Boiling and evaporating
Explanation:
Its loosing water just trust
how many grams of magnesium oxide are formed if 20.9 grams of Mg and 15.2 g of O2 react.
Answer:
Mass of magnesium oxide formed = 35.1 g
Explanation:
Given data:
Mass of Mg = 20.9 g
Mass of O₂ = 15.2 g
Mass of magnesium oxide formed = ?
Solution:
Chemical equation:
2Mg + O₂ → 2MgO
Number of moles of Mg:
Number of moles = mass/molar mass
Number of moles = 20.9 g/ 24 g/mol
Number of moles = 0.87 mol
Number of moles of O₂:
Number of moles = mass/molar mass
Number of moles = 15.2 g/ 32 g/mol
Number of moles = 0.475 mol
Now we will compare the moles of MgO with magnesium and oxygen.
Mg : MgO
2 : 2
0.87 : 0.87
O₂ : MgO
1 : 2
0.475 : 2/1×0.475 = 0.95
Number of moles of MgO formed by Mg are less thus Mg will limiting reactant.
Mass of MgO:
Mass = number of moles × molar mass
Mass = 0.87 mol × 40.3 g/mol
Mass = 35.1 g
2. Why can a liquid take the shape of the bottom of its container?
The particles of a liquid can flow around one another to new locations.
The particles of a liquid can break free from one another and spread out.
The particles of a liquid can vibrate within their fixed locations.
Answer:
The particles can flow around one another to new locations.
Explanation:
The atoms in a liquid can take the form of their container, the atoms in a liquid are loosely packed.
Answer:
i believe it is the second one
Explanation:
solid particles vibrate and gas is more free the liquid is confide but free at the same time.
Please answer this it’s due in 1 hour
Water gets to the outside of the cup through diffusion. Diffusion is when particles moves from higher to lower concentration. But we are talking about water particles, so it's osmosis, similar to diffusion but with water molecules instead.
Draw a lot of water particles in the cup and point arrows to the outside. Then add water particles to the outside of the cup too. But don't draw too much cuz we need a lower concentration of water particles.
elements are made up of atoms, and atoms are made up of electrons, protons, and neutrons. Match the charge (+,-,0= positive, negative, neutral) with the electron, proton, and neutron
for example, you might write: electron=+ (I'm not saying this is the correct pairing)
Answer:
Explanation:
Electron (-) Negative
Proton (+) positive
Neutron(0) neutral
In a titration of 35.00 mL of 0.737 M H2SO4, __________ mL of a 0.827 M KOH solution is required for neutralization.
A) 35.0
B) 1.12
C) 25.8
D) 62.4
E) 39.3
Answer:
In a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is required for neutralization.
Explanation:
The balanced reaction is
H₂SO₄ + 2 KOH ⇒ 2 H₂O + K₂SO₄
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction) 1 mole of H₂SO₄ is neutralized with 2 moles of KOH.
The molarity M being the number of moles of solute that are dissolved in a given volume, expressed as:
[tex]Molarity=\frac{number of moles}{volume}[/tex]
in units of [tex]\frac{moles}{liter}[/tex]
then the number of moles can be calculated as:
number of moles= molarity* volume
You have acid H₂SO₄
35.00 mL= 0.035 L (being 1,000 mL= 1 L) Molarity= 0.737 MThen:
number of moles= 0.737 M* 0.035 L
number of moles= 0.0258
So you must neutralize 0.0258 moles of H₂SO₄. Now you can apply the following rule of three: if by stoichiometry 1 mole of H₂SO₄ are neutralized with 2 moles of KOH, 0.0258 moles of H₂SO₄ are neutralized with how many moles of KOH?
[tex]moles of KOH=\frac{0.0258moles of H_{2} SO_{4}*2 moles of KOH }{1mole of H_{2} SO_{4}}[/tex]
moles of KOH= 0.0516
Then 0.0516 moles of KOH are needed. So you know:
Molarity= 0.827 Mnumber of moles= 0.0516volume=?Replacing in the definition of molarity:
[tex]0.827 M=\frac{0.0516 moles}{volume}[/tex]
Solving:
[tex]volume=\frac{0.0516 moles}{0.827 M}[/tex]
volume=0.0624 L= 62.4 mL
In a titration of 35.00 mL of 0.737 M H₂SO₄, 62.4 mL of a 0.827 M KOH solution is required for neutralization.
The molecules that make up soap have a region that contains polar covalent bonds and a region that contains nonpolar covalent bonds. How does this property explain the ability of soap molecules to help remove oils from your skin when you wash?
Explanation:
The cleansing action of soaps is predicated on the nature of soaps as we have it.
A soap has the ability to remove dirt from materials. The cleansing action of a soap is related to the structure of its molecule. A molecule of soap has dual structure with polar head that is water loving and a long hydrocarbon tail which is hydrophobic. The structure enables soap molecules to emulsify an organic dirt present on a fabric in water. The soap causes the suspension of tiny oil droplets in the aqueous medium.Cells reproduce using:
sexual reproduction
budding
mitosis
Answer:
It is D. Mitosis
Explanation:
Hope this helped have an amazing day!
Monique hears on the weather report that cold, dry air from Canada is going to hit warm, moist air from the Gulf of Mexico. She should expect a:
Answer:
She should suspect a Tornado.
Explanation:
Tornadoes form when warm humid air collides with cold dry air. The denser the cold air is pushed over warm air, causing an updraft. As soon as it reaches the ground a tornado is formed.
Name the following alkane molecule:
CH3CH2CHBrCH3
A. 2-bromobutane
B. 3-bromopropane
C. 3-bromobutane
Answer:
It's the A. 2-bromobutane
Explanation:
Have a good day
The name of the alkane molecule [tex]\rm CH_3CH_2CHBrCH_3[/tex] is 2-bromobutane. The correct answer is option A.
An alkane is a type of hydrocarbon molecule that consists entirely of single-bonded carbon and hydrogen atoms. Alkanes are also known as saturated hydrocarbons.
The name of an alkane molecule is based on the number of carbon atoms in the longest chain of carbon atoms in the molecule. In this molecule, there are four carbon atoms in the longest chain, so the root name is "butane". The position of the bromine atom is indicated by a number, which is the lowest number assigned to a carbon atom that is attached to the bromine atom. In this case, the bromine atom is attached to the second carbon atom in the chain, so the name is "2-bromobutane".Therefore, 2-bromobutane is the name of the alkane molecule [tex]\rm CH_3CH_2CHBrCH_3[/tex]. Option A is the correct answer.
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Which natural resource needed to be mined to produce a digital phone?
O plastic
O copper
O coal
O natural gas
Answer:
Copper
Explanation:
copper is used in the wiring of the phone
The natural resource that can pass through mining process for manufacture of digital phone is B: Copper.
Copper can be regarded as a natural resources, it a chemical element which is a metal.It has a unique properties such as melleability, and very soft, it is used in production of digital phone because of its electrical conductivity and its softness in development of the panels of the digital phone.Therefore, option B is correct.
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Determine the formula for rhodium (II) nitrate.
Answer:
Yup this is right. I checked! Rhodium(II) nitrate | H2N2O6Rh+2 - PubChem.
Explanation:
How long it take for skin cell to divide
Answer:
This process of growing, moving and shedding takes about four weeks. SO I would think dividing is around a month
Explanation:
Hope this helps! Consider Brainiest! <3
Answer:
1/2 to 1 and 1/2 hours
Explanation:
Skin cells go through the division phase that takes between 1/2 to 1 and 1/2 hours to complete, depending on the location. Body cells, which include skin, hair, and muscle, are duplicated through the process of mitosis. Skin cells belong in the category of somatic cells and are duplicated at a rapid rate during life.
spent lead-acid batteries are exempt from hazardous waste regulations if they are: a. stacked recycled b. thrown away c. stored outside
Answer:
It’s A
Explanation: they stack the waste batteries and then recycle it
More ATP per carbon is produced from oxidation of fatty acids as compared to glucose. However, fatty acids are used primarily to provide fuel for ATP synthesis during long periods of exercise. Why can't fatty acids be used to fuel short, intense periods of exercise?
A. Short, intense periods of exercise preferentially activate ATP synthesis from glucose.
B. Short, intense periods of exercise do not signal release of fatty acids from adipose tissue.
C. Short, intense periods of exercise do not require ATP synthesis.
D. Short, intense periods of exercise do not provide sufficient time for oxidative phosphorylation to occur.
Answer:
The correct option is D
Explanation:
Although, option A appears correct but the reason for option A is actually option D. What this means is that, during short intense exercise (anaerobic exercise), the body preferentially activates ATP synthesis from glucose (glycolysis) even though the beta oxidation of fatty acid produces more energy (ATP) - this is because glycolysis occurs many times faster (about a 100 times faster) than the beta oxidation of fatty acid/oxidative phosphorylation. Thus, it can be said that short, intense periods of exercise do not provide sufficient time for oxidative phosphorylation to occur.
Please answer the following three questions as completely as possible. No one sentence answers will be graded. These should be more in-depth answers and require some thinking:
What are some of the relationships among thermal energy, kinetic energy, particle movement, and temperature?
please answer this its due in 30 minutes
Answer:
pwede po ba tagalog
Explanation:
question ko lang po
Answer:
particle movement = kinetic energy = thermal energy = temperature.
Explanation:
kinetic energy is the force that an object in motion possesses. the particles of every substance are in motion and so they all possess kinetic energy. so if a particle moves more vigorously, it has more kinetic energy.
temperature is how hot or cold a substance is. particles with more thermal energy have higher temperatures. thermal energy comes from the kinetic energy of a substance. so the more kinetic energy the object possess, the more thermal energy they will have.
when a particle moves faster, it gains kinetic energy. this means its thermal energy increases and therefore its temperature increases.
How many atoms are in 89.96 moles of carbon
Answer:
541.74× 10²³ atoms of C
Explanation:
Given data:
Number of moles of carbon = 89.96 mol
Number of atoms = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
89.96 mol × 6.022 × 10²³ atoms of C / 1mol
541.74× 10²³ atoms of C
electrons that are free to move throughout a substance are associated with
Answer:
valence electrons
Explanation:
Which Two process is it Giving brainliest
Answer:
C and D!
Explanation:
Don't listen to the other dude above me.
Which of the following is not a reason why chemical bonds are important
24. The hydronium ion concentration in a sample of rainwater is found to be 1.7 × 10−6 M at 25 °C. What is the concentration of hydroxide ions in the rainwater?
Answer:
6144
Explanation:
Which is longer, the carbon-oxygen single bond in a carboxylic acid or the carbon-oxygen bond in an alcohol?