Answer:
B. 387 V
Explanation:
Ohm's law states that the voltage is the product of the current and resistance.
V = IR
V = (9 A) (43 Ω)
V = 387 V
3. When atoms combine to form molecules, a (blank) change has occurred.
When atoms combine to form molecules, a chemical change has occurred as there is a chemical reaction involved.
What is a chemical change?
The atoms in the reactants rearrange and link differently throughout a chemical reaction to create one or more new products with properties distinct from the reactants. A chemical change occurs when a new substance is created.Chemical transitions, commonly referred to as chemical reactions, are the conversion of one or more substances into one or more unique, distinct substances.In other words, a chemical reaction involving atom rearrangement is referred to as a chemical transformation.Examples of chemical changes include burning, cooking, rusting, and decaying.Thus, a chemical change takes place when atoms combine to form molecules.
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19. Which of the following chemical equations represents
propane combusts?
A. 2 CsHe (g) + 5O2 (g) → 3C02(g) + 4H20 (1)
B. 2 CsHe (g) + 5O2 (g) → 3CO2(g) + 3H20(1
C. CsHe (g) + O2 (g) → CO2(g) + H2O(1)
D. CsHa (g) + 5O2 (g) → 3CO2(g) + 4H2O(1)
Answer:
C₃H₈ (g) + 5O₂(g) → 3CO₂ (g) + 4H₂O (l)(option D. with the proviso that the subscripts of propane's chemical formula must be corrected)
Explanation:
Propane is the saturated hydrocarbon, alkane, with chemical formula C₃H₈ or CH₃CH₂CH₃.
The complete combustion of the hydrocarbons yield carbon dioxide (CO₂) and water (H₂O).
The chemical equation that represents this combustion is:
C₃H₈ (g) + O₂(g) → CO₂ (g) + H₂O (l) (skeleton equation: unbalanced)Once you balance it, you get:
C₃H₈ (g) + 5O₂(g) → 3CO₂ (g) + 4H₂O (l)Left side Right side
C 3 3
H 8 4×2 = 8
O 5×2 = 10 3×2 + 4 = 10
That equation corresponds to the option D. of the list, with the proviso that the subscripts of propane's chemical formula must be corrected
. In lab we used 40 ml of 6M NaOH in making soap.
How many moles of NaOH was in this volume?
Hey there!:
Molarity of NaOH = 6 M or 6 mol/L
Volume of NaOH = 40 mL
Therefore , number of moles of NaOH:
40 mL =( 6 mol / 1000 mL)*40=
6/ 1000 * 40 => 0.24 moles of NaOH
Hope this helps!
The moles of NaOH will be 0.24 moles.
What is a mole?A mole would be defined as the quantity of a material that includes precisely 6.02214076 X 1023 of the particular chemical elementary entities.
Calculation of mole
Given data:
Volume = 40 ml
Molarity = 6M
Mole can be determined by using the formula:
Molarity = moles of solute / solution (L)
6 M = Moles of solute ×1000/ 40
Moles of solute = 0.24 moles
Therefore, the moles of NaOH will be 0.24 moles.
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Weight training has the biggest effect on __________.
Weight training has the biggest effect on skeletal muscles.
A muscle fibre is another term for a single skeletal muscle cell, which is not the same as skeletal muscle. The many muscle fibres that make up skeletal muscles are bound together by connective tissue. The contraction of each muscle fibre, which is made up of a single multinucleated cell, results in force and movement.
A specific form of cell called a muscle fibre sometimes referred to as a myofiber or muscle cell, is what gives skeletal muscles their shape. Long, cylindrical cells called muscle fibres make up a muscle's length and are bound together by connective tissue. Since they have several nuclei, they are multinucleated cells, which may contract to provide force and movement.
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A hot air balloon contains 5.30 kL of helium gas when the temperature is 12°C. At what temperature will the balloon's volume have increased to 6.00 kL? (Remember to convert to Kelvin and then back to Celcius.)
(A) 50 °C
(B) -21 °C
Answer:
(A) 50 °C
Explanation:
Ideal gas law:
PV = nRT
If pressure is held constant, then:
V₁ / T₁ = V₂ / T₂
Substituting values:
(5.30 kL) / (12 + 273 K) = (6.00 kL) / T
T = 323 K
T = 50 °C
Answer:
Option (A) 50 °C
Explanation:
Thinking process:
Let the volume of the hot air be [tex]V_{1}[/tex] 5.30 k l = 5 300 l = 5.3 m³
The initial temperature will be 12 ° (12 + 273.15) = 285.15 K
The later volume, [tex]V_{2}[/tex] = 6 Kl = 6 000 l = 6 m³
The equation will be:
[tex]\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }[/tex]
If the pressure is the same, then:
[tex]\frac{5.3}{285.15} = \frac{6}{T_{2} }[/tex]
Solving for [tex]T_{2}[/tex] gives:
T₂ = 322.8
= 49.66
= 50°
In a chemical reaction, 24 grams of
carbon reacted with exactly 64 grams
of oxygen. The product of this reaction
was carbon dioxide. How many grams
of carbon dioxide were formed?
Help pls urgent!!
Answer: there must be 64 g + 24 g = 88 g of carbon dioxide present after the reaction.
Explanation: Since the total mass of substances used up in the reaction must be equal to the amount of product formed, according to the conservation of mass law,
What is true of a covalent bond? (03.03)
It is the electrostatic attraction between oppositely charged particle
It is the sharing of electrons by overlapping orbitals
It involves the exchange of electrons from one atom to another
It involves the sharing of neutrons between two nuclei
Answer:
I think B..
Explanation:
It is the sharing of electrons from one atom to another .
Answer:
The answer is b: It is the sharing of electrons by overlapping orbitals
Explanation:
The ionic bong involves the exchange of electrons from one atom to another to keep eight particles in their outermost orbit. In this way the atoms become stable. This happens between a metal, which losing electrons becomes a cation that now has a positive charge, and a non-metal, which accepting electrons becomes an anion that now has a negative charge. So the ionic bond is the electrostatic attraction between oppositely charged particle (cation and anion).
No chemical bond involves sharing neutrons between two nuclei. Chemical bonds occur between the electrons of atoms, which are found in the outer layer around the nuclei.
So, the correct answer is b: It is the sharing of electrons by overlapping orbitals. This happens between two non-metallic elements.
A]a[B]b [C]c [D]d
When the Keq value is large, the number representing [A]a[B]b must be ____ (smaller / larger) than the number representing [C]c[D]d. This relationship means that the ____(products/ reactants) must be favored and that the mixture at equilibrium is largely ___ (products/ reactants).
Answer:
When the Keq value is large, the number representing [A]a[B]b must be smaller than the number representing [C]c[D]d. This relationship means that the products must be favored and that the mixture at equilibrium is largely products.
Explanation:
For the equilibrium:aA + bB ⇄ cC + dD,
Keq = ([C]^c x [D]^d)/([A]ᵃ[B]ᵇ),
For large value of Keq, the value of [C]^c x [D]^d) is larger than that of ([A]ᵃ[B]ᵇ).
So, When the Keq value is large, the number representing [A]a[B]b must be smaller than the number representing [C]c[D]d.
For large value of Keq, the products are favored as the concentration of products is larger than that of reactants at equilibrium.So, This relationship means that the products must be favored and that the mixture at equilibrium is largely products.
Answer:
1.smaller
2.products
3.products
Explanation:
As matter changes, what happens to the energy?
Energy, Temperature, and Changes of State
Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid.
what is the volume of stank of nitrogen that contains 17 moles of nitrogen at 34 C under 12,000Pa?
Answer:
3626.76dm³
Explanation:
Given parameters:
Number of moles of Nitrogen in tank = 17moles
Temperature of the gas = 34°C
Pressure on the gas = 12000Pa
Unkown:
Volume of the tank, V =?
Converting the parameters to workable units:
We take the temperature from °C to Kelvin
K = 273 + °C = 273 + 34 = 307k
Taking the pressure in Pa to atm:
101325Pa = 1atm
12000Pa = 0.118atm
Solution:
To solve this problem, we employ the use of the ideal gas equation. The ideal gas law combines three gas laws which are the Boyle's law, Charles's law and the Avogadro's law.
It is expressed as PV = nRT
The unknown is the Volume and we make it the subject of the formula
V = [tex]\frac{nRT}{P}[/tex]
Where R is called the gas constant and it is given as 0.082atmdm³mol⁻¹K⁻¹
Therefore V = [tex]\frac{17 x 0.082 x 307 }{0.118}[/tex] = 3626.76dm³
Answer: The volume of nitrogen will be 3614.15 L
Explanation:
To calculate the number of moles, we use the equation given by ideal gas equation:
[tex]PV=nRT[/tex]
Or,
[tex]PV=\frac{m}{M}RT[/tex]
where,
P = pressure of the gas = 12000 Pa = 12 kPa (Conversion factor: 1 kPa = 1000 Pa)
V = Volume of gas = ?
n = number of moles of nitrogen = 17 moles
R = Gas constant = [tex]8.31\text{L kPa }mol^{-1}K^{-1}[/tex]
T = temperature of the gas = [tex]34^oC=[34+273]=307K[/tex]
Putting values in above equation, we get:
[tex]12kPa\times V=17mol\times 8.31\text{L kPa }mol^{-1}K^{-1}\times 307K\\\\V=3614.15L[/tex]
Hence, the volume of nitrogen will be 3614.15 L
What are repelled in the VSEPR theory?
A. Other molecules
B. Opposite charges
C. Protons in nuclei
D. Electron pairs
Answer:
electron pairs, i just did it on APEX
Explanation:
Final answer:
In VSEPR theory, the elements that are repelled are electron pairs, which include both bonding pairs and lone pairs, dictating the molecular geometry.
Explanation:
The Valence Shell Electron Pair Repulsion (VSEPR) theory predicts the arrangement of electron pairs around each central atom in a molecule. According to this theory, electron pairs are oriented to be as far apart as possible to minimize repulsions. Therefore, the elements that are repelled in VSEPR theory are D. Electron pairs. These include both bonding electron pairs (shared between atoms to make covalent bonds) and lone pairs (non-bonding electron pairs).
In VSEPR theory, the repulsion between electron pairs is a key factor in determining the geometric structure of molecules. For example, in a water molecule (H₂O), the two lone pairs on the oxygen force the hydrogen atoms to adopt a bent arrangement rather than a linear one.
Consider the following unbalanced redox reaction:
NO3- → NO
How many water molecules are needed for balancing?
Answer:
I water molexule
Explanation:
equat8n= 2NO3 + h2O =2 HNO3
Final answer:
Upon balancing the redox reaction NO3- → NO, we find that two water molecules (2 H2O) are required for balancing the reaction, ensuring both mass and charge conservation.
Explanation:
The reaction provided, NO3- → NO, is an unbalanced redox reaction. Balancing redox reactions involves ensuring that both the number of atoms of each element and the charge are balanced on both sides of the equation. Let's focus on the nitrogen and oxygen atoms first, and then balance the hydrogen atoms and the charges. After balancing, the fully balanced equation becomes:
NO3- + 2 H+ + e- → NO + 2 H2O
To confirm the balance, verify that there are equal numbers of nitrogen atoms and oxygen atoms on each side of the equation, as well as that the total charge is balanced. Here we can see that there are the same number of nitrogen atoms (1 on each side) and oxygen atoms (3 on the left, 1 in NO, and 2 in the 2 H2O molecules), which means the number of atoms is balanced. Additionally, the total charge on each side is also the same (-1 on the left side with the nitrate ion and the 2 extra positive charges from the hydrogen ions equaling +1, and 0 on the right side with NO being neutral and water having no charge).
Therefore, two water molecules (2 H2O) are required to balance this redox reaction.
The device shown in the picture is used by electric utility power stations to produce electrical energy from _____ energy
Answer:
mechanical energy
Which of the following is a physical property of a substance? A. Hardness B. Flammability C. Reactivity D. Toxicity
Answer:
A. Hardness
Explanation:
Physical property is those that can be observed without changing the substance directly. This includes hardness, color, volume, etc.
Chemical property is observed by changing the chemical identity of the substance, for example, corrosion, oxidation, etc. Flammability, Reactivity, and Toxicity all fall under this category.
The physical property of a substance among the options is; Choice A: Hardness
The physical properties of a substance include properties which can be assessed about a substance without the substance going through any change.
On the other hand, chemical properties of a substance are properties which can only be assessed after the substance undergoes a chemical change..
The option Flammability can be assessed only upon ignition of the substance.The option reactivity requires a chemical change to be measured.The option Toxicity can only be assessed after testing with another entity(a biological specie perhaps).Hence, Hardness is the only physical property of a substance among the options above.
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In which layer of the Earth does the motion of the convection currents drive plate movement?
A.)mantle
B.)outer core
C.)asthenosphere
D.)lithosphere
Answer: option (A)
Explanation: The convection current is generates in the mantle due to the heat radiated from the core of the earth. Due to this convection current, the lithospheric plates moves as the upper part of the mantle known as the asthenosphere, is the region which is viscous in nature and drives the plates to move. This is a repeating cycle that constantly forces the plates to move.
Thus the correct answer is option (A).
Answer:
Mantle
Explanation:
Which subatomic particle has the least mass?
electron
proton
neutron
nucleus
the answer is electrons
Final answer:
The subatomic particle with the least mass is the electron, having a mass of about 0.00055 amu, which is significantly lighter than both the proton (1.0073 amu) and the neutron (1.0087 amu).
Explanation:
When comparing subatomic particles such as electrons, protons, and neutrons, the electron is the particle with the least mass. Despite all three being crucial components of an atom, an electron has an extremely small mass compared to protons or neutrons. Specifically, the mass of an electron is about 0.00055 amu (atomic mass units), whereas a proton has a mass of approximately 1.0073 amu, and a neutron has a mass of about 1.0087 amu.
Protons and neutrons, collectively known as nucleons, have masses that are nearly identical. However, the neutron is very slightly more massive. The vast difference in mass between electrons and nucleons (protons and neutrons) means that almost all the atomic mass is concentrated in the atom's nucleus, not in the electrons that orbit it.
A mixture contains 35.07 grams of carbon dioxide, 27.93 grams of water vapor, 12.64 grams of nitrogen, and 5.54 grams of helium. The total pressure of the system is 12 atm, What is the partial pressure of the helium?
A. 0.88 atm
B. 0.82 atm
C. 0.073 atm
D. 0.068 atm
Answer:
[tex]\boxed{\text{3.6 atm}}[/tex]
Explanation:
For this question, we must use Dalton's Law of Partial Pressures:
The partial pressure of a gas in a mixture of gases equals its mole fraction times the total pressure:
[tex]p = \chi p_{\text{tot}}[/tex]
1. Calculate the number of moles of each gas.
[tex]n_{\text{CO}_{2}} = \text{35.07 g} \times \dfrac{\text{1 mol}}{\text{44.01 g}} = \text{0.7969 mol}\\\\n_{\text{H}_{2}\text{O}} = \text{27.93 g} \times \dfrac{\text{1 mol}}{\text{18.02 g}} = \text{1.550 mol}\\\\n_{\text{N}_{2}} = \text{12.64 g} \times \dfrac{\text{1 mol}}{\text{14.01 g}} = \text{0.9022 mol}\\\\n_{\text{He}} = \text{5.54 g} \times \dfrac{\text{1 mol}}{\text{4.003 g}} = \text{1.384 mol}[/tex]
2. Calculate the total moles
[tex]n_{\text{tot}} = \text{(0.7969 + 1.550 + 0.9022 + 1.384) mol = 4.633 mol}[/tex]
3. Calculate the mole fraction of helium
[tex]\chi = \dfrac{n_\text{He}}{n_{\text{tot}}} = \dfrac{\text{1.384 mol}}{\text{4.633 mol}}= 0.2987[/tex]
4. Calculate the partial pressure of helium:
[tex]p_{\text{He}} = \chi_{\text{He}} p_{\text{tot}}= 0.2987 \times \text{12 atm} = \textbf{3.6 atm}\\\\p_{\text{He}} = \boxed{\textbf{3.6 atm}}[/tex]
Answer:
The partial pressure of He = 3.97 atm
Explanation:
Given:
Mass of CO2 = 35.07 g
Mass of H2O = 27.93 g
Mass of N2 = 12.64 g
Mass of He = 5.54 g
Total pressure P = 12 atm
To determine:
The partial pressure of He
Calculation:
Based on Dalton's law, the partial pressure of a gas can be expressed as a product of its mole fraction and the total pressure
[tex]P(gas)=X(gas)*P(total)-----(1)[/tex]
where X(gas) = mole fraction
[tex]X(gas)=\frac{moles(gas)}{moles(total)}----(2)[/tex]
[tex]Moles(CO2)=\frac{mass(CO2)}{mol.wt.(CO2)}=\frac{35.07g}{44g/mol}=0.7970[/tex]
[tex]Moles(H2O)=\frac{mass(H2O)}{mol.wt.(H2O)}=\frac{27.93g}{18g/mol}=1.552[/tex]
[tex]Moles(N2)=\frac{mass(N2)}{mol.wt.(N2)}=\frac{12.64g}{28g/mol}=0.4514[/tex]
[tex]Moles(He)=\frac{mass(He)}{at.wt.(He)}=\frac{5.54g}{4g/mol}=1.385[/tex]
Therefore:
Moles of He = 1.385
Total moles = 0.7970+1.552+0.4514+1.385 =4.188
Substituting the appropriate values in equation (1) gives:
[tex]P(He)=X(He)*P(total)[/tex]
[tex]P(He)=\frac{1.385}{4.188}*12 atm = 3.97 atm[/tex]
Nitrogen is a group 15 element. What does being in this group imply about the structure of the nitrogen atom?
A. Nitrogen has 15 valence electrons.
B.
Nitrogen has 15 neutrons.
C.
Nitrogen has 5 valence electrons.
D.
Nitrogen has 5 neutrons.
Answer: Option (C) is the correct answer.
Explanation:
As nitrogen is a group 15 element so, it means that common electronic distribution of elements of group 15 will be 2, 8, 5.
Hence, it means that all the elements of group 15 have 5 valence electrons.
Valence electrons are the electrons that are present in the outermost orbital shell.
Whereas atomic number of nitrogen atom is 7 and its atomic mass is 14. Therefore, it contains 7 protons and 7 neutrons in its nucleus.
Thus, we can conclude that nitrogen is a group 15 element it implies that nitrogen has 5 valence electrons.
Which contains elements with similar properties in the periodic table?
The answer is a column.
Which of the following is an example of consideration?
A. Repeating what someone has said to show you understand
B. Opening a door for someone who is carrying things
C. Teasing students who earn good grades
D. Using positive body language
Answer:
B. Opening a door for someone who is carrying things
30 POINTS WILL GIVE BRAINLIEST
_____ numbers are based on the distribution of electrons in a molecule.
Question 4 options:
coefficient
oxidation
electron
chemical
What is a substance used to decrease the rate of a chemical reaction
Answer:
Inhibitor.
Explanation:
An inhibitor is a substance that decreases the rate of, or prevents, a chemical reaction.An inhibitor can reduce the effectiveness of a catalyst in a catalyzed reaction PLS ASAP!! Which has a wavelength of 350 nanometers?
red light
violet light
infrared light
ultraviolet light
Answer:
Ultraviolet light.
Hope this helps!
Ultraviolet light has a wavelength of 350 nanometers. Therefore, the correct option is option D.
What is wavelength?The length between identical spots between two succeeding waves is known as the wavelength, which is a feature of waves. The wavelength of a wave is indeed the distance among one wave's peak (or trough) and the next. In mathematics, the Greek symbol lambda () is used to denote wavelength.
The colour of light is determined by its wavelength, and the pitch of sound is determined by its wavelength. The visible spectrum of light has wavelengths between around 700 nm (red) and 400 nm (violet). The range of audible sound wavelengths is roughly 17 mm to 17 m. Compared to visible light, audible sound has far longer wavelengths. Ultraviolet light has a wavelength of 350 nanometers.
Therefore, the correct option is option D.
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How many grams of Fe3O4 are required to react completely with 69.76 grams of H2?
Answer:
=2023.04 grams
Explanation:
Magnetite reacts with hydrogen to produce Iron metal and steam. Steam instead of water is produced as the reaction occurs at temperatures above the boiling point of water.
Fe₃O₄ + 4 H₂ → 3 Fe +4 H₂O
From the equation, 1 mole of Fe₃O₄ reacts with 4 moles of H₂.
69.76 grams of H₂ has the following number of moles.
Number of moles= mass/RAM
=69.76/2
=34.88 moles.
The reaction ratio of Fe₃O₄ to H₂ is 1:4
Thus number of moles of magnetite= (1×34.88)/4
=8.72 moles.
Mass= moles × RAM
=8.72 moles × (56×3+16×4)
=2023.04 grams
How many molecules of O2 are required to react with 3.00 moles P4?
P4+5O2⟶2P2O5
The reaction requires 15 moles of O2, which equates to 9.03 * 10^24 molecules, to react with 3 moles of P4.
Explanation:To calculate the number of O2 molecules required in this reaction, we refer to the stoichiometric coefficients in the balanced chemical equation. Looking at the equation, we can see that 1 mole of P4 reacts with 5 moles of O2 to produce 2 moles of P2O5. Therefore, 3 moles of P4 would require 3*5=15 moles of O2. To convert moles to molecules, we have to multiply by Avogadro's number (6.022 * 10^23) because there are that many molecules in one mole. Therefore, 15 moles of O2 would equate to 9.03 * 10^24 molecules of O2.
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why leather gets hardered after tanning
Answer:
Mutual coagulation takes place
Explanation:
Leather gets hardened after tanning because mutual coagulation takes place.
HELP FAST PLZ!!!!The process of photosynthesis takes place on the inner membrane of what organelle?
chloroplast
endoplasmic
reticulum
cell membrane
cell wall
Answer:
chloroplast
Explanation:
chloroplasts
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.
Explain, in terms of particles, concentration, and reaction rate, what you expect to happen when methane gas (CH4) and hydrogen sulfide gas (H2S) are sealed in a flask and reach a state of equilibrium.
CH4 (g) +2 H2S (g) Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. CS2 (g) + 4 H2 (g)
Answer:
Explanation:
The equation of this equilibrium reaction is shown below:
CH₄ + 2H₂S ⇄ CS₂ + 4H₂
All the gases in this reaction are in a gaseous phase.
When gases are in equilibrium with one another, we can make some comments about their particles, concentration and reaction rate.
For the particles:
The magnitude of the kinetic energy here is very great according to the kinetic theory of matter. This is because the particles are in a uniform gaseous phase.
In terms of concentration
When dealing with gases in equilibrium, we talk more of the concentration with regards to pressure. Pressure is equivalent to concentration when we consider gaseous reactions. An increase in pressrue is like applying a stress to the system. Based on Le Chatelier's principle, increase in pressure favors the side with smaller volume:
CH₄ + 2H₂S ⇄ CS₂ + 4H₂
3 moles of gases 5 moles of gases
Increase in pressure will favor the reactant side.
Reaction rate
The rate at which this reaction will proceed would be very fast. This is because gases have the fastest rate of reaction. The equilibrium will quickly be reached.
What is heat vaporization?
Answer:
D
Explanation:
there is no explanation, I researched the topic
how many cups are in 4 liters? 1 L=4.2cups
Answer:
16.8 cups
Explanation:
We are given that there are 4.2 cups in in 1 liter of a liquid and we are to find out the number of cups that there will be in 4 liters.
To find this out, we will use the ratio method.
We know that:
1 L = 4.2 cups
So we can write it as:
[tex]\frac{1L}{4 L} =\frac{4.2 cups}{x}[/tex]
[tex] x = 4 .2 \times 4[/tex]
[tex] x = 1 6 . 8 [/tex]
Therefore, there are 16.8 cups in 4 liters.