Answer:
CDE
Explanation:
If your on USA test perp
The questions are most relevant to increasing the strength of the electromagnet are Does increase the current in .....?, Will increasing the number of loops of wire around the.....? and Will positioning the loops of….? Therefore, option C, D and E are correct.
What are the properties of electromagnet ?The characteristics known as electromagnetic properties determine how quickly a substance will absorb or emit electromagnetic radiations.
We may be familiar with electromagnetic radiations such as radio waves, microwaves, ultraviolet rays, infrared rays, and visible light rays.
Transverse waves characterize electromagnetic radiation.They move across fluctuating magnetic and electric fields so that they are perpendicular to the wave's path of propagation and at right angles to one other.
Thus, option C, D and E are correct.
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how does the study of genetics and Dna
help the study of evolution
Jenny has a gold bar in a piece of gold foil both objects are made of 100% pure gold watch and closing can guinea make about the two objects
Answer:
What is the question your asking?
Explanation:
All atoms of the same element have the same properties.
If you have 1.4 grams of silver (Ag), how many moles of silver do you have?
Answer: There are 0.0129 moles of silver present in 1.4 grams of silver (Ag).
Explanation:
Given: Mass of silver = 1.4 g
Number of moles is the mass of substance divided by its molar mass.
As molar mass of silver is 107.86 g/mol. Therefore, moles of silver are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{1.4 g}{107.86 g/mol}\\= 0.0129 mol[/tex]
Thus, we can conclude that there are 0.0129 moles of silver present in 1.4 grams of silver (Ag).
How long does it take to fill one train car full of nuclear power can keep a power plant running
Convert 27.7 kilometers to centimeters.
Answer:
The correct answer is - 2770000 cm.
Explanation:
1 kilometer = 1000 meter
1 meter = 100 centimeter
1 kilometer = 100*1000 cm
1 km = 100000 cm.
then,
27.7 kilometers = 2.77 × 10^6 centimeters
So, 27.7 kilometers = 27.7 × 100000
= 2.77 × 106 or 2770000 centimeters.
4.
How many parents take part in binary fission?
Answer:
one parent
Explanation:
As one parent cell divides it into two daughter cells and so on.
1.6 x 1023 atoms of Be, how many moles of Be are there?
Answer:
1 mole.
Explanation:
1.6x10^23 = NA = 1 mole of any substance.
If 0.60 L of a solution contains 6.6 g of NaBr, what is its molar concentration?
Answer:
Molarity = moles ÷ liters
to get moles of NaBr divide grams of NaBr by its molar mass (mass of Na + mass of Bromine)
Na = 22.989769
Br = 79.904
molar mass of NaBr = 102.893769
6.6g ÷ 102.893769 = 0.064143826 moles of NaBr
0.064143826 moles ÷ 0.60 liters = 0.1069 molar concentration or 11 %
What mass of aluminum sulfate is required to precipitate all of the Ba?? out of 45.0 mL of 0.548 M barium nitrate solution? 3 Ba(NO3)2 (aq) + Al2(SO4)3 (aq) --> 3 BaSO2 (s) + 2 Al(NO3)3 (aq)
Answer:
2.82 g
Explanation:
Step 1: Write the balanced precipitation reaction
3 Ba(NO₃)₂ (aq) + Al₂(SO₄)₃ (aq) ⇒ 3 BaSO₄(s) + 2 Al(NO₃)₃(aq)
Step 2: Calculate the reacting moles of Ba(NO₃)₂
45.0 mL (0.0450 L) of 0.548 M Ba(NO₃)₂ react.
0.0450 L × 0.548 mol/L = 0.0247 mol
Step 3: Calculate the moles of Al₂(SO₄)₃ that react with 0.0247 moles of Ba(NO₃)₂
The molar ratio of Ba(NO₃)₂ to Al₂(SO₄)₃ is 3:1. The reacting moles of Al₂(SO₄)₃ are 1/3 × 0.0247 mol = 8.23 × 10⁻³ mol
Step 4: Calculate the mass corresponding to 8.23 × 10⁻³ moles of Al₂(SO₄)₃
The molar mass of Al₂(SO₄)₃ is 342.2 g/mol.
8.23 × 10⁻³ mol × 342.2 g/mol = 2.82 g
The ionization potential of Be atom is more than expected because it has -
(a) half filled valence p orbitals
(b) fully filled valence s orbitals
(c) both a and b
Answer:
(b) fully filled valence s orbitals
Explanation:
Electron configuration of Be: 1s22s2
2s2 is fully filled
do carbon has ions charge?
Carbon has an outer shell consisting of 4 valence electrons. ... Thus, a carbon ion can have a charge of anywhere from -4 to +4, depending on if it loses or gains electrons. Although the most common oxidation states of carbon are +4 and +2, carbon is able to make ions with oxidation states of +3, +1, -1, -2, and -3.
Why is medical technology good for society?
O A. It creates more jobs to do by hand,
B. It makes bilingspitals bigger.
C. It gives patients more illnesses.
D. It helps doctors treat diseases.
Match the solutions to the descriptions of the freezing points.
a. One mole of the ionic compound Na3PO4 dissolved in 1000 g H2O
b. One mole of the ionic compound CuSO4 dissolved in 1000 g H2O
c. One mole of the nonelectrolyte C6H12O6 dissolved in 1000 g H2O
1. Highest freezing point
2. Intermediate freezing point
3. Lowest freezing point
Answer:
1c
2b
3a
Explanation:
Step 1: Write the general expression to calculate the freezing point depression
The freezing point depression is a colligative property, that can be calculated using the following expression.
ΔT = i × Kc × b
where,
i: van 't Hoff factor (number of ion particles per formula unit)
Kc: cryoscopic constant (Kc for water: 1.86 °C.Kg/mol)
b: molality (moles of solute per kilogram of solvent)
All the solution have the same Kc and the same b (1 mol/1 kg = 1 m), so ΔTf variation will depend on i
Step 2: Calculate the freezing point of the Na₃PO₄ solution
Na₃PO₄ has 4 ions (3 Na⁺ and 1 PO₄³⁻), so i = 4.
ΔT = i × Kc × b = 4 × 1.86 °C.Kg/mol × 1 mol/kg = 7.44 °C
T = 0°C - 7.44 °C = -7.44 °C
Step 3: Calculate the freezing point of the CuSO₄ solution
CuSO₄ has 2 ions (1 Cu²⁺ and 1 SO₄²⁻), so i = 2.
ΔT = i × Kc × b = 2 × 1.86 °C.Kg/mol × 1 mol/kg = 3.72 °C
T = 0°C - 3.72 °C = -3.72 °C
Step 4: Calculate the freezing point of the C₆H₁₂O₆ solution
C₆H₁₂O₆ is a nonelectrolyte (it doesn't ionize), so i = 1
ΔT = i × Kc × b = 1 × 1.86 °C.Kg/mol × 1 mol/kg = 1.86 °C
T = 0°C - 3.72 °C = -1.86 °C
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Ethyne or acetylene is also used in cutting torches. The acetylene is combined with pure oxygen producing a flame with a temperature of 6332 °F or 3500 °C. The combustion of acetylene in the presence of excess oxygen yields carbon dioxide and water:
2C2H2 (g) + 5O2 (g) --> 4CO2 (g) + 2H2O (l)
Calculate the value of ΔS° for this reaction.
A. +689.3 J/mol K
B. +432.4 J/mol K
C. -432.4 J/mol K
D. -122.3 J/mol K
The correct answer is
C. -432.4 J/mol K
How many atoms are in 1.20 moles of copper?
Answer:
7.23x10^23 atoms
Explanation:
1 mole = 6.023x10^23
1.20 mole = 6.023x10^23 x 1.2
= 7.23x10^23 atoms
The atoms present in 1.20 moles of copper is 7.23 × [tex]10^{23}[/tex] atoms.
What is atom?A chemical element is made up of atoms, which are the basic components of ordinary matter.
Calculation of atoms
Given data:
n = 1.20 moles.
It is known that.
1 mole = 6.023 × [tex]10^{23}[/tex]
So, 1.20 moles = 6.023 × [tex]10^{23}[/tex] × 1.2 = 7.23 × [tex]10^{23}[/tex] atoms.
Therefore, number of atoms in copper will be 7.23 × [tex]10^{23}[/tex] atoms.
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What is the volume of an object if the density is 8g/cm^3 and has a mass of 16g? *
1 point
8mL
128mL
16mL
2mL
Answer:
I think the answer is 2mL.
Explanation:
i hope it help.
What is the new concentration? L
M NaCl
Answer:
Explanation:
\we must convert the mass of NaCl in grams into moles. We do this by dividing by the molecular weight of NaCl (58.4 g/mole). Then, we divide the number of moles by the total solution volume to get concentration. The NaCl solution is a 0.1 M solution.
Answer:
0.125
Explanation:
boom
what cause a mass defect?
○A. The mass of a nucleus is larger than it should be.
○B. The mass of a nucleus cannot be accurately measured.
○C. Mass is converted to the energy binding a nucleus together.
○D. Mass is lost when a particle is released in a reaction.
Answer: Mass is converted to the energy binding a nucleus together.
Explanation: a p e x
Mass is converted to the energy binding a nucleus together cause a mass defect.Hence , Option (C) is correct.
What is Mass defect ?
The actual atomic mass is less than the predicted mass calculated by adding the masses of nucleons.
This additional mass is accounted for by binding energy that is released when a nucleus is formed.
When a nucleus is formed, some of the mass is converted to energy and this results in the mass defect.
Therefore, Mass is converted to the energy binding a nucleus together cause a mass defect. Hence , Option (C) is correct.
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(NH4)2Cr2O7 Cr2O3 + N2 + H2O
If 4.7369 moles of H2O are produced, how many moles of (NH4)2Cr2O7 were reacted?
Answer:
the original substances in any chemical reaction. products. the resulting substances in any....chromium(III) oxide, and water. (NH4)2Cr2O7(s) → N2(g) + Cr2O3(s) + 4H2O(g).
How is an exothermic reaction indicated in an equation?
[tex] \longrightarrow\sf \pmb {Exothermic \: Reaction}[/tex]
[tex] \tt \green {An \: exothermic \: reaction \: is \: indicated \: by \: writing \: “+Heat” \: or \: “+Heat \: energy” \: or \: “+Energy” \: on \: the \: products \: side \: of \: an \: equation.}[/tex]
Answer: Heat is included as one of the products.
Explanation:
Que uso le darías a la vida diaria escribe en español plis
Explanation:
Facilitar el movimiento y desplazamiento de objetos pesados reduciendo el rose del objeto contra el suelo, Obtener un movimiento circular por efecto de la fuerza de un liquido, en el caso de contadores, molinos, centrales hidroeléctricas y turbinas.
Transmitir el movimiento de un eje a otro como en el caso de las lavadoras, bicicletas y neveras. Reducir drásticamente el esfuerzo necesario para elevar y mover objetos, como en casos de pozos de agua y ascensores Transformar movimientos giratorios en otros movimientos o viceversa. ,
8. Sulfur has a first ionization energy of 1000 kJ/mol. Photons of what frequency are required to ionize one mole of Sulfur?
Answer:
the frequency of photons [tex]v = 1.509\times10^{39}Hz[/tex]
Explanation:
Given: first ionization energy of 1000 kJ/mol.
No. of moles of sulfur = 1 mole
[tex]\Delta E_1 = 1000KJ/mol[/tex]
We know that plank's constant
[tex]h = 6.626\times10^{-34} Js[/tex]
Let the frequency of photons be ν
Also we know that ΔE = hν
this implies ν = ΔE/h
[tex]= \frac{10^6J}{6.626\times10^{-34} Js}[/tex]
[tex]v = 1.509\times10^{39}Hz[/tex]
Hence, the frequency of photons [tex]v = 1.509\times10^{39}Hz[/tex]
Which is/are used in nuclear reactors to absorb neutrons?
A. heavy nuclei
B. critical mass
C. chain reactions
D. control rods
Answer:
A. heavy nuclei
Explanation:
They absorb neuyrons in order to hain stability.
How many molecules of ethanol, C2H5OH, are contained in a 150. gram sample?
1.96 x 1024
46.0
6.02 x 1023
5.1 x 10-25
Answer:
1.96 × 10²⁴ molecules
Explanation:
Step 1: Given data
Mass of ethanol (m): 150. g
Step 2: Calculate the number of moles (n) corresponding to 150. g of ethanol
The molar mass of ethanol is 46.07 g/mol.
150. g × 1 mol/46.07 g = 3.26 mol
Step 3: Calculate the number of molecules in 3.26 moles of ethanol
To convert moles into molecules, we need Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.
3.26 mol × 6.02 × 10²³ molecules/1 mol = 1.96 × 10²⁴ molecules
LPLEASE HELP I AM STUCK I. THIS Q
Answer:
c
Explanation:
is chemistry hard in grade 11
explain to me everything plsss thanks
Explanation:
Chemistry is overall a very interesting subject and it really depends on what you personally consider enjoyable. I love chemistry and I think that grade 11 chemistry is very easy. It's mostly based on balancing chemical equation, molar mass calculations and more. But it's a great course to take based on my experience.
someone help me with this please, it’s overdue:(
Answer:
See explanation.
Explanation:
Hello there!
3. In this case, according to the given question, it turns out possible for us to say that any chemical formula, for an ionic compound, has the cation (positive) on the left and the anion (negative) on the right; thus, since Mg is a metal, which tends to lose electrons and become positively charged whereas the Cl is a nonmetal, which tends to gain electrons and become negatively charged, we have the following:
[tex]Mg^{2+}Cl^-\\\\Mg^{2+}Cl^-_2\\\\MgCl_2[/tex]
4. In this case, since lithium is a metal, as well as magnesium, it is not possible for them to switch around their charges as they will not be bonded because they will be repelled rather than attracted because of their equal positive charges.
Regards!
How many moles of KOH are present in 750. mL of a 0.250 M solution?
Answer:
Answer: Number of moles of KOH present in solution is 3.75.
Explanation:
0.1 moles
There are 0.1 moles of solute in 250 mL of 0.4 M solution.
1 Answer. 1 mol of NaOH
Jasmine travels a lot and collects rocks wherever she goes. She was examining two rocks from her collection, and she noticed that they are different types of rock. How could energy have played a role in the different rock types forming?
A. Energy changes rock on different continents in different ways. Each continent on Earth has different rock that might form liquid rock or small rock pieces when exposed to energy.
B. Energy caused one rock type to form, but not the other. Rock that forms because of energy is a different type of rock than rock that forms without energy.
C. Energy from different sources leads to different types of rock. Energy inside Earth melts rock into liquid rock, but energy from the sun causes rock to weather into small pieces of rock.
D. Energy causes different types of rock to change in different ways. Energy changes igneous rock into liquid rock and changes sedimentary rock into small pieces of rock.
Answer:
C
Explanation:
energy from different sources leads to different types of rocks. energy inside the earth(volcanoes) melts rocks into liquid rock(molten larva) but energy from the sun(heat radiation) causes rock to weather(breakdown) into small pieces of rocks
Calculate the volume of sulfur dioxide produced when 27.9 mL O2 reacts with carbon disulfide.
Answer:
18.6 ml
Explanation:
From the balanced equation given:
Volume of oxygen = 27.9 mL
From the equation, we will see that three moles of oxygen react with CS_2 to give two moles of sulfur dioxide (SO_2)
Also, three mL of O_2 yields two mL of SO_2
Now, to calculate the volume of SO_2; we have:
[tex]=27.9 mL \times \dfrac{2 mL \ of SO_2}{3 mL \ O_2}[/tex]
= 18.6 mL of SO_2