A beam of light has a wavelength of 280 nanometers. The frequency of the light is 1.07 × 10¹⁵ Hz.
the information in the question is given as :
wavelength of beam of light = 280 nm
the relation between the frequency and the wavelength is given as :
F = c / λ
where,
F = frequency of the light
c = speed of light
λ = wavelength of light
speed of light , c is = 3 × 10⁸ m/s
substituting all the value in the formula for the frequency, we get:
F = c / λ
F = 3 × 10⁸ / 280 × 10⁻⁹
F = 0.0107 × 10¹⁷ Hz
F = 1.07 × 10¹⁵ Hz
Thus, A beam of light has a wavelength of 280 nanometers. The frequency of the light is 1.07 × 10¹⁵ Hz.
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What is the molar mass of sulfur dihydride?
Explanation
To find the molar mass of sulfur dihydride, you will need to find the sum of all the atomic masses making up sulfur dihydride.
sulfur dihydride is H2S.
Atomic mass of H = 1,00784 u
Atomic mass of S = 32,065 u
Molar mass = (1.00784 x 2) + 32,065 = 34.081 g/mol
Answer
34.081 g/mol
Can you please help resolve and explain?
The Ka of an acid indicates how strong this acid is. This means that greater acidity constant Ka corresponds to stronger acids, and lower Ka corresponds to weakest acids. I the example the acetic acid (CH3COOH) has an acidity constant 6 order of magnitude greater than the HCO3- there fore acetic acid is stronger than HCO3-
A 0.772g sample of an unknown compound, composed only of carbon and hydrogen, produced 2.31g of CO2 and 1.26g of H2O in a combustion analysis. What is the mass percent composition of carbon of the unknown compound?
The percent mass composition of carbon of the unknown compound is 42.8%.
What is the mass percentage of carbon in the given unknown compound?The mass percentage of carbon in the given unknown compound is calculated as follows:
moles of substance = mass / molar massmolar mass of carbon dioxide = 44.0 g/mol
molar mass of carbon = 12 g/mol
molar mass of water = 18 g/mol
molar mass of hydrogen = 1.0 g/mol
Moles of carbon dioxide = 2.31/44
Moles of carbon dioxide = 0.0525 moles
Moles of Carbon = 0.0525 moles
mass of carbon = 0.0525 * 12
mass of carbon = 0.105 g
Moles of water = 1.26/18
Moles of water = 0.07 moles
Moles of hydrogen = 0.07 * 2
Moles of hydrogen = 0.14 moles
mass of hydrogen = 0.14 * 1
mass of hydrogen = 0.14
mass of compound = 0.105 + 0.14
mass of compound = 0.245
Percentage mass of carbon = 0.105/0.245 * 100
Percentage mass of carbon = 42.8%
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Fe2O3 + 3 H2 –> 2 Fe + 3 H2OIf 9.1 g of Fe2O3 is reacted with 16.8 g of hydrogen to form iron and water. How many grams of iron are produced?
Answer:
6.37g of iron are produced.
Explanation:
1st) From the balanced reaction we know that 1 mole of Fe2O3 reacts with 3 moles of H2 to produce 2 moles of Fe and 3 moles of H2O.
With the molar mass of Fe2O3 (160g/mol) and H2 (2g/mol) we can convert the moles to grams:
- Fe2O3 conversion: 1 mole is equal to 160g, so here it is not necessary to calculate the conversion.
- H2 conversion:
[tex]3moles*\frac{2g}{1mole}=6g[/tex]So, from the balanced reaction we know that 160g of Fe2O3 react with 6g of H2.
2nd) Now we have to find out which compound is the limiting reactant and which compound is the excess reactant, using the 9.1g and 16.8g given in the exercise:
[tex]\begin{gathered} 160gFe_2O_3-6gH_2 \\ 9.1gFe_2O_3-x=\frac{9.1gFe_2O_3*6gH_2}{160gFe_2O_3} \\ x=0.34gH_2 \end{gathered}[/tex]So, the 9.1g of Fe2O3 will need 0.34g of H2 to react properly, but we have 16.8g of H2 so H2 is the excess reactant and Fe2O3 is the limiting reactant.
3rd) Using the limiting reactant, we can calculate the grams of iron that are produced.
It is necessary to use the molar mass of iron (56g/mol) to convert the 2 moles in the reaction to grams (2 Fe moles = 112g).
[tex]\begin{gathered} 160gFe_2O_3-112gFe \\ 9.1gFe_2O_3-x=\frac{9.1gFe_2O_3*112gFe}{160gFe_2O_3} \\ x=6.37gFe \end{gathered}[/tex]Finally, 6.37g of iron are produced.
How much of NaCl is in 1.66 L of 0.400 M NaCl? Answer in units of mol.
The question requires us to calculate the number of moles of NaCl in 1.66 L of a 0.400 M NaCl solution.
To answer this question, we need to keep in mind that the molar concentration provides the amount of moles in one liter solution. Thus, we can write that:
1 L of NaCl solution -------------- 0.400 mol of NaCl
We can use this information to calculate the amount of NaCl, in moles, in 1.66 L in a 0.400 M NaCl solution:
1 L of NaCl solution -------------- 0.400 mol of NaCl
1.66 L of NaCl solution --------- x
Solving for x, we have:
[tex]x=\frac{(1.66\text{ L of NaCl solution)}\times(0.400\text{ mol of NaCl)}}{(1\text{ L of NaCl solution)}}=0.664\text{ mol of NaCl}[/tex]Therefore, there are 0.664 moles of NaCl in 1.66 L of a 0.400 M NaCl solution.
When a scientist performs an experiment, there are many changes that can occur. Which observation should she list as a chemical change?.
The substance must change into a new substance is the observation that scientist must list for a chemical reaction to happen.
A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical reactions, which can frequently be described by a chemical equation, traditionally include changes that only affect the locations of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei (no change to the elements present). The study of chemical processes involving unstable and radioactive elements, where both electronic and nuclear changes may take place, is known as nuclear chemistry.
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Of the following bonds, which is most polar?Group of answer choicesS-ClC-NC-BC-OP-S
Explanation:
The polarity of a bond is given by the difference in electronegativity between the two atoms that form said bond.
What are the ionic compounds of gunpowder within fireworks, and what would be the chemical reaction of its combustion?
There are a lot of ionic compounds in fireworks, most of them are salts, like: Strontium Nitrate and Strontium Carbonate ( both in the color red); Calcium Carbonate and Calcium Chloride (orange); Sodium Nitrate, Sodium Oxalate (yellow); Barium Nitrate and Barium Carbonate (green) and so on. For the gunpowder itself we have the Potassium Nitrate as an ionic compound.
The chemical reaction for the combustion of black powder is:
6KNO3 + C7H4O + 2S -> K2CO3 + K2SO4 + K2S + 4CO2 + 2CO + 2 H2O + 3N2
It's not just a single reaction, but this is a general representation of it.
A gaseous compound is subjected to increased pressure. What is happening to the temperature at the same time?-increased temperature, increased volume-increased temperature, decreased volume-decreased temperature, increased volume-decreased temperature, decreased volume
A gaseous compound is subjected to increased pressure. What is happening to the temperature at the same time?
We assume the gas is in a container.
If we increase the pressure, is a direct relationship with temperature, so the temperature increases, but if the volume is not constant, it will decrease.
Answer: increased temperature, decreased volume.
In everyday language, macroscopic algae is called
Macroscopic algae are called Seaweed.
The largest and most complex marine algae are called seaweeds while the most complex freshwater forms are the Charophyta a division of green algae which includes, for example, Spirogyra and stoneworts. Algae are almost ubiquitous throughout the world and can be categorized ecologically by their habitats.
Planktonic algae are microscopic and grow suspended in the water, whereas neustonic algae grow on the water's surface and can be micro- or macroscopic. Phytoplankton refers to a group of plankton that is photosynthetic. Most of them are microscopic algal species or microalgae. The algae of this paraphyletic group Charophyta were previously included in Chlorophyta so green algae and Chlorophyta in this definition were synonyms.
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Calculate the number of moles in: 147 g BaF 2
To solve the question we need to:
Step 1 - Calculate the molar mass of BaF2
Step 2 - Use the following formula: moles = mass/molar mass
Step 1:
Atomic mass of Ba is 137.33 g/mol
Atomic mass of F is 19 g/mol
We can find these values at periodic table.
We multiply the atomic mass by the quantity of atoms of each element:
(1x137.33) + (2x19) = 175.33 g/mol
So the molar mass of BaF2 is 175.33 g/mol
Step 2:
moles = mass/molar mass
moles = 147/175.55
moles = 0.838 moles
Answer: 0.838 moles of BaF2
Liquid to Gas =
Solid to Liquid =
The process of a liquid becoming a gas is called boiling (or vapourization) and the process of a solid becoming a liquid is called melting.
Vaporization is the process of converting a liquid into a gas. It is also called evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.
Melting is a physical process that results in the phase transition of a substance from a solid to a liquid. During melting, the energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.
Example 1: Industrially, salt is recovered from seawater by the process of vaporization. Wet clothes are dried up due to the process of vaporization. The process is used in many industrial processes for separating the components of a mixture.
Example 2: Ice to water - Ice melts back into the water when it is left out at temperatures above the freezing point of 32 degrees. Rocks to lava - Rocks in volcanoes can be heated until they are molten lava. Metal to molten liquid - Metals such as steel and bronze can be molten down.
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Problem: Co3+ | Co2+ and Ni2+ | NiAnode?Cathode?(You need to use Reference Table B-16.)a. Co2+b. can't answerc. Ni2+d. Nie. Co3+
Answer:
- Anode: Co3+ | Co2+
- Cathode: Ni | Ni2+
Explanation:
The anode is where oxidation reaction occurs, and the cathode is where reduction reaction occurs.
From the table of reduction potencials, we find that:
- Co reaction:
[tex]\begin{gathered} Co^{3+}+2e^-\rightarrow Co^{2+} \\ E=1.81\text{ }V \end{gathered}[/tex]- Ni reaction:
[tex]\begin{gathered} Ni\rightarrow Ni^{2+}+2e^- \\ E=-0.250\text{ V} \end{gathered}[/tex]Now, to find out which one is the anode and which one is the cathode, it is necessary to compare the reduction potencials.
The reaction of Ni have negative potentials, so Ni will be the anode and Co will be the cathode.
I need homework help Which compound has the bigger Lattice energy?a) CaI2 CaCl2
Which compound has the bigger Lattice energy?
a) CaI₂ CaCl₂
To find the Lattice Energy we have to pay attention to the ions that form each compound.
In our case, both Cations are the same: Ca2+
So we have to find the difference between the anions: I- and Cl-
Which of the following is not related to metallic bond?
A. Alloy
B. Shared electrons
C. Transferred electrons
D. Sea of electrons
Answer: B. Shared electrons
Explanation: Electrons are shared in covalent bonds. The other options are all properties of metallic bonds.
Perform the followingmathematical operation, andreport the answer to thecorrect number of significantfigures.9.635 ÷ 12.9 = [?]
Significant figures are the number of digits in a number. To count the significant figures we must take into account that the zeros before the digit should not be counted, but the intermediate zeros or after the digit should be counted.
Now, when we do the two-digit division, the significant figures of the quotient will be equal to those of the digit with the fewest number of significant figures. Let's see what are the figures of the terms of the division and the final result:
We see that the quotient of the division is 0.746899..., but we have to write the answer only with 3 significant figures. If the number after the last figure to which we want to approximate is greater than 5, we must add 1 to the last figure, so the result will be: 0.747.
Answer: 0.747
24. In the following balanced chemical equation: 2 Ag₂O
→ 4 Ag + 0₂
if one wanted to make 2 moles of silver, how many moles of Ag₂O would be needed to react?
a) 1
b) 2
c) 4
d) 6
e) 8
Determine the energy change associated with the transition from n = 2 to n = 5 in the hydrogen atom.
The energy change associated with the transition from n = 2 to n = 5 in the hydrogen atom is 2.856 eV.
Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave. The equation c = then links the wave's frequency to both its wavelength and the speed of light.
The expression for the change in energy for a transition from a state to a state in a hydrogen atom is
E = -13.6Z² (1/Nf² - 1/Ni²)
where Z is the atomic number, which is 1 for hydrogen. Substituting
Nf= 5 and Ni= 2
E = -13.6 × (1/ (5)²- 1/ (2)²)
E = -13.6 × - 0.21
E = 2.856 eV
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the existence of a vacancy in a crystal decreases the energy of the material i. not enough information to determine ii. false iii. true
iii. True. The existence of a vacancy in a crystal decreases the energy of the material.
One of the scientific disciplines called crystallography examines how the atoms in a solid crystal are arranged. When molecules are linked together in a regular way, these crystals are created.
The mechanical, physical, and optical properties of a material can alter when crystal flaws are present. The strength of the material can be impacted by a flaw.
An irregularity in the atoms' regular geometrical arrangement within a crystalline material is referred to as a crystal defect. These flaws are caused by the solid being deformed, cooling quickly from a high temperature, or being exposed to high-energy radiation (such as X-rays or neutrons). because the vacancy cause defects and the crystal structure is disturbed this causes a decrease in energy.
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a guitar string vibrates at a frequency of 5 Hz and has a wavelength of 3 m. what is the wave speed?
can someone answer this 4 me?
The statement among the available options that describes the result of the study is that less than 50% of the people never felt phantom pain. Option 2.
Data interpretationIn order to interpret the data and find the best description of the outcome of the experiment, the response needs to be grouped into 2 from the 3 available responses.
Since those that phantom pain sometimes and always belong to the same category, the respondents can be summed up into one:
Number of those that sometimes feel phantom pain = 534
Number of those that always feel phantom pain = 193
Total number of people that feel phantom pain = 534 + 193
= 727 people
Number of people that never feel phantom pain = 183
Total number of respondents in the experiment = 183 + 534 + 193
= 910 people
Percentage of respondents that felt phantom pain = 727/910 x 100
= 79.89%
Percentage of people that never felt phantom pain = 183/910 x 100
= 20.11%
Percentage of people that felt phantom pain all the time = 193/910 x 100
= 21.21%
Thus, the statement that correctly describes the outcome of the experiment of all the statements is that less than 50% never felt phantom pain.
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Light of frequency 3.62*10^15 Hz strikes a surface of copper (W0=4.70 eV). How much kinetic energy does the liberated electron have in eV.
I’ve been stuck on his for two days. Please help me, I give away brainliest all the time.
Kinetic energy liberated is 10.2 eV from the equation of photoelectric effect
What is photoelectric effect?
Photoelectric effect is a phenomenon in which electrons are ejected from the surface of a metal when light is incident on it.
What is the kinetic energy?
According to Einstein's photoelectric equation, we know that kinetic energy is the difference between the energy of incident photon and the work function of the metal.
KE = E - Wo
KE = kinetic energy
E = energy of the photon
Wo = work function
Now we know that
E = hf
h = Plank's constant (6.6 × 10-³⁴ )
f = frequency
E = 6.6 × 10-³⁴ × 3.62 × 10¹⁵
= 2.39 × 10-¹⁸J or 14.9 eV
1 eV = 1.6 × 10-¹⁹ J
Substituting
KE = 14.9eV - 4.7eV
KE = 10.2eV
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What will happen to the connection if the live wire is not connected?
Answer: it would cause a serious shock
Explanation:
True or false. A 3. 0-mole sample of co2 gas effused through a pinhole in 18. 0 s. It will take 1. 92 s for the same amount of h2 to effuse under the same conditions.
False, the effusion of the gas will be faster than the carbon dioxide.
The process of a gas escaping from a container through a hole that is significantly smaller in diameter than the molecules' mean free route is known as effusion in physics and chemistry. The gas escape is caused by the pressure difference between the container and the outside, which is why such a hole is frequently referred to as a pinhole. Since there are almost no molecular collisions in the vicinity of the hole under these circumstances, nearly all molecules that reach the hole continue and pass through it.
Graham's law of effusion can be used to find the rate of effusion: rate of effusion is inversely proportional to the molar mass of the gas.
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5. Base your answer to the following question on the informationbelow and on your knowledge of chemistryA metal worker uses a cutting torch that operates by reactingacetylene gas, C2H2(g), with oxygen gas, O2(g), as shown inthe unbalanced equation below.CH,(g) + 0,(g) → CO2(g) + H2O(g) + heat
In order to properly balance an equation, we need to make sure that the same amount of elements on the reactants side matches the number of elements on the products side, we can do that by increasing the number in front of each molecule, the so called stoichiometric coefficient.
The proper balancing for this question is:
2 C2H2 + 5 O2 -> 4 CO2 + 2 H2O
Therefore the coefficients are:
2, 5, 4, 2
Which of the following best describes one way the endocrine system effects the reproductive system?
A
The endocrine system directly produces sperm cells in men and egg cells in women, both which are needed for puberty.
B
The reproductive system produces hormones that are required in order for the endocrine system to work properly.
C
The endocrine system produces hormones that make puberty possible.
D
The endocrine system regulates mood and metabolism, both which are necessary for reproduction.
Answer:
C is the answer
Explanation:
In the reaction H₂ + I₂ --> 2HI, what is the oxidation number of the hydrogen in the H₂ reactant? (2 pts)
*
2 points
-1
0
1
2
The oxidation number of hydrogen in H2 reactant will be 0.
The number assigned to each element in a chemical combination would be the simplest definition of the oxidation number. The amount of electrons that atoms in a molecule could share, lose or gain during forming chemical connections with other atoms of such a particular character would be known as the oxidation number.
Hydrogen can be considered as free elements and it is known that free elements have 0 oxidation number .Here, H2 element is also as a free element. So, it has 0 oxidation number.
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If the density of water is 1 gram/cm3 this means that the mass of 100 cm3 of water should be?
Answer
100 grams
Explanation
Given that:
The density of water = 1 gram/cm³
The volume of the water = 100 cm³
What to find:
The mass of the 100 cm³ of water.
Step-by-step solution:
The mass of the water can be calculated using the formula:
[tex]\begin{gathered} Density=\frac{Mass}{Volume} \\ \\ Mass=Density\times Volume \\ \\ Mass=1\text{ }gram\text{/}cm^{3^}\times100cm^3 \\ \\ Mass=100\text{ }grams \end{gathered}[/tex]Therefore, this means that the mass of 100 cm3 of water should be 100 grams.
based on the models of bonding in ethylene and acetylene, which molecule should have the greater carbon-carbon bond energy?
The compound that would have the stronger carbon carbon bond is acetylene.
What is the bond energy?The term bond energy has to do with the energy that is required to form a bond. It can also be seen as the energy that has to be supplied in order to break the bonds that are in the compound.
Now we know that the strength of a bond also has a lot to do with the length of the bond. We know that shorter bonds that have a greater s character are the ones that are always the stronger bonds. We have to factor in the fact that acetylene has a triple bond and ethylene has a double bond.
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in an ionic bond, ________ lose valence electrons and become _________ charged
Answer:
in an ionic bond, atoms lose valence electrons and become positively charged
Explanation:
To clarify, the atom that loses the electrons becomes a positively charged ion (cation), and the atom that gains them becomes a negatively charged ion (anion).