Which of the following is the best definition of a diatomic molecule?
A. molecule made from the covalent bond of 2 atoms of the same type
B. ionic compound with a net charge of 2
C. cation with 2 positive charges
D. compound made of 2 different elements
The correct option is A.
Diatomic molecules are molecules that are made up of only two atoms, the atoms can be of the same element or different elements. When the atoms are of the same element, the diatomic molecule is described as homonuclear; when the atoms are of different elements, the molecule is described as heteronuclear. The type of chemical bond that exist in diatomic molecule is covalent bond.
The most common shape for a galaxy is ______.
irregular
elliptical
cluster
spiral
spherical
Answer: Spiral
Explanation:
A galaxy contains billions of stars, dust and gases which are bound together by gravity. Galaxies have mainly three shapes:
Spiral - It has nucleus at the center from which arms extend outwards and wrap around like a spiral. Milky way is a spiral galaxy.
Elliptical - It is like flat ellipse. It has now characteristic features.
Irregular - It does not have any definite shape.
The most common shape of galaxy is the spiral shape.
Concerning the 10.0 mL of 0.50 M NaCl diluted to 100 mL of solution:
When a solution is diluted, does the dilution change the number of grams dissolved?
yes
no
What letter represents the activation energy for the reaction without/with the enzyme?
The activation energy is usually symbolized by 'E' or 'Ea' in many diagrams. When analyzing biochemical reactions with and without an enzyme, the activation energy with an enzyme may be represented by 'b', while without an enzyme might be represented by 'a'.
Explanation:In most diagrams that represent energy in a chemical reaction, the activation energy is typically represented by the letter 'E' or 'Ea'. The activation energy is the energy necessary for a chemical reaction to occur. In the context of a biochemical reaction influenced by an enzyme, the activation energy would be represented separately for the reaction with and without the enzyme.
For example, in a reaction without an enzyme, it might be represented by the letter 'a', which indicates a large amount of activation energy required. But in a reaction with an enzyme, it might be represented by the letter 'b', signifying the lower amount of activation energy required due to enzyme catalysis. Hence, enzymes lower the activation energy making the reactions occur more readily.
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What is difference between ionic and covalent bond.
Answer:
The difference between an ionic and covalent bond is that an ionic bond is that an ionic bond is between a nonmetal and a nonmetal and a covalent bond between a metal and a nonmetal.
IONIC BOND:
NM-NM
COVALENT BOND:
[M+][NM-]
At STP, when 3.75 liters of oxygen reacts with excess glucose, what volume of carbon dioxide does it produce? 6O₂(g) + C₆H₁₂O₆(g) d 6H2O(g) + 6CO₂(g)
Which of the following is the correct formula for sodium oxide? NaO2 NaO Na2O3 Na3O4 Na2O
Answer:
Na2O
Explanation:
Just took the quiz
Give the approximate bond angle for a molecule with a trigonal planar shape.
A) 109.5°
B) 180°
C) 120°
D) 105°
E) 90°
A pyrotechnician mixes 280 g of black powder for a firework. Find the amount of oxygen, carbon dioxide, and sulfur dioxide generated when this firework bursts, if the oxidizing agent in the powder is saltpeter. Which are the limiting reactants for each reaction? Based on this, calculate the maximum yield of oxygen, carbon dioxide, and sulfur dioxide when 280 g of black powder is burned. When the pyrotechnician tested the firework, he found the actual yields of oxygen, carbon dioxide, and sulfur dioxide to be 81.57 g, 82.75 g, and 46.5 g respectively. What is the percent yield of each gas? Why should pyrotechnicians worry about the yield of the reactants in a firework? How does the yield affect the firework and the environment?
Answer:
it would be 82.75
Explanation:
Final answer:
To predict the performance and environmental impact of a firework, its theoretical yields of oxygen, carbon dioxide, and sulfur dioxide are calculated. Actual yields are compared to these theoretical yields to determine percent yield, while also considering limiting reactants and their effects on the reaction's end amount.
Explanation:
To calculate the theoretical yield of oxygen, carbon dioxide, and sulfur dioxide produced from the 280 g of black powder used in a firework, we must first write and balance the chemical reaction using the components of gunpowder: charcoal (carbon), sulfur, and saltpeter (potassium nitrate). Saltpeter acts as the oxidizing agent providing the oxygen needed for combustion. The actual amounts of products formed can then be compared with theoretical yields to find the percent yield:
The theoretical yield of oxygen: It is determined by the amount of potassium nitrate that decomposes.The theoretical yield of carbon dioxide: This is determined by the complete combustion of carbon present in the charcoal.The theoretical yield of sulfur dioxide: It is based on the complete reaction of sulfur in the gunpowder.Percent yield for each gas is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. Pyrotechnicians must be concerned with the yield of reactants in fireworks because it affects the quality and safety of the firework and the amount of pollution created, which impacts the environment.
Limiting reactants are substances that will be consumed first, restricting the amount of product formed. By identifying which compounds are limiting, a pyrotechnician can predict how much product will be generated.
Which of the following reactions is endothermic?
H2(g) + ½ O2(g)H2O(g),H = -57.82 kcal
½N2(g) + O2(g) + 8.1 kcalNO2(g)
½ N2(g) + 3/2 H2(g)NH3(g) + 11.0 kcal
C(diamond)+ O2(g)CO2,H = -94.50 kcal
If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place?
Answer:
plato answer d
Explanation:
How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor?
To produce 19.1 moles of water vapor when carbon dioxide is in excess, 19.1 moles of hydrogen gas are needed, based on the stoichiometry of the water-gas shift reaction.
Explanation:To determine how many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation for the reaction. The reaction in question is not stated, but it is likely a form of the water-gas shift reaction, which is:
CO2 + H2 → CO + H2O
From the equation, we can see that for every mole of H2O produced, one mole of H2 is required, assuming that carbon dioxide (CO2) is in excess.
Therefore, if we have 19.1 moles of water vapor (H2O), we need 19.1 moles of hydrogen gas (H2).
Final answer:
To produce 19.1 moles of water vapor by reacting hydrogen gas with excess carbon dioxide, 19.1 moles of hydrogen gas would be required, assuming a 1:1 stoichiometry.
Explanation:
To determine how many moles of hydrogen gas are needed to react with excess carbon dioxide to produce 19.1 moles of water vapor, we need to consider the balanced chemical equation:
H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)
However, the provided examples do not directly address this reaction. Instead, we can deduce from the given information that:
The formation of water from hydrogen and oxygen follows a stoichiometry of 2 H₂:1 O₂:2 H₂O.In a similar vein, if we assume the reaction consuming hydrogen and carbon dioxide produces water and carbon monoxide in a 1:1 stoichiometry (as in the Sabatier process), we have:
H₂ (g) + CO₂ (g) → H₂O (g) + CO (g)
For every mole of water produced, one mole of hydrogen is required. Therefore, for 19.1 moles of water, 19.1 moles of hydrogen gas are needed.
Which elements are the main components of the Sun?
A substance that contains various elements or compounds without bonding or fixed proportions is a(n) _____.
element
compound
mixture
formula
recipe
mixture is the answer
The mass number of an atom is found by adding
Draw a structural isomer of ethylcyclohexane that also contains a 6-carbon ring.
Structural isomer of ethylcyclohexane which also contains 6-carbon ring is as shown in the attachment.
What are structural isomers?Structural isomers are defined as the isomers in which atoms are completely arranged in a different order but the molecular formula remains the same.
They are the molecules which have same molecular formula but different connectivities of atoms which depend on the order they are put together.An increase in the number of carbon atoms leads to an increase in the structural isomers.
There are 3 types of structural isomerism which are as follows:
1)Chain isomerism - In this isomerism, there is a difference in the atomic arrangement of carbon and carbon chain .
2) position isomerism- In this isomerism, there is a difference occupied by the substituent atoms due to unsaturation in the chain.
3) functional group isomerism-In this isomerism, there is a presence of odd form of a functional group.
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The distance between two corresponding parts of a wave is the wave's
Why is hydrogen chloride (HCl) polar?
it has equally shared electrons
it has unequally shared electrons
it has bent asymmetry
it has linear symmetry
It has unequally shared electrons is the right answer.
Answer: Option B
Explanation: Unequally shared shared electrons
i just got it right on the mastery test^^^^^
How will the following changes affect the mole fraction of chlorine gas, χcl2, in the equilibrium mixture.?
Decreasing the volume of an equilibrium mixture by a factor of 3 will cause a corresponding increase in pressure. According to Le Châtelier's Principle, the system will adjust to reduce this increase in pressure by shifting the equilibrium to the side with fewer moles of gas. Therefore, the mole fraction of chlorine gas, χcl2, will decrease.
Explanation:To understand how changes in conditions might affect the mole fraction of chlorine gas, χcl2, it's necessary to refer to Le Châtelier's principle, which states that a system in equilibrium will adjust so as to reduce any stress placed on it. The stress can be a change in pressure, volume, or concentration of reactants or products.
If you decrease the volume of the system by a factor of 3, the system will adjust to decrease the pressure by shifting the equilibrium to the side with fewer moles of gas. Given the reaction SbCl3 (g) + Cl2 (g) and knowing that chlorine molecules dissociate as per Cl2 (g) -> 2Cl(g), the system will respond to the increased pressure by shifting to the right to reduce the total number of gas molecules. This decrease of chlorine gas on the left side of the reaction will cause its mole fraction to decrease.
It is important to remember that changes shifting the equilibrium according to these process follow the rules defined by chemical equilibrium concepts and reaction quotient (Qc) values.
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The formation of a gas in a chemical reaction, due to ions changing places, often indicates that the reaction is which type?
A) synthesis
B) double-displacement
C) decomposition
D) single-displacement
Answer:
the answer is D, i just got a 100
Explanation:
im him
The formation of a gas in a chemical reaction due to ions exchanging partners typically indicates that the reaction is a double-displacement or double-displacement reaction.
Explanation:The formation of a gas in a chemical reaction, due to ions changing places, often indicates that the reaction is a double-displacement reaction. A double-displacement reaction involves two ionic compounds in aqueous solution where the anions and cations exchange partners, resulting in the formation of two new compounds. This type of reaction typically occurs in aqueous solutions and one of the new compounds formed is often a solid precipitate, a gas, or a molecular compound such as water.
Examples of double-replacement reactions include reactions where an acid reacts with a base to form a salt and water (neutralization), or when two soluble salts react and produce an insoluble salt precipitate or a gas. Overall, the distinguishing characteristic of a double-displacement reaction is that both reactants are compounds and they swap their anion or cation partners.
This system relates to the process by which an organism gets rid of its waste.
Which of the following is a pure substance? Pure gold, pure milk, pure water, pure seawater, pure sand. And how do you know?
Which factor will have little effect on the solubility of saturated solutions?
A.
the temperature of the solvent
B.
the amount of extra time spent stirring the solution
C.
the amount of pressure the solvent is under
D.
the addition of other solutes
A) The most important factor for solubility is temperature
We define the solubility of a substance in a solvent at a particular temperature
a) for solids the solubility increases with increase in temperature
b) for gas the solubility decreases with increase in temperature
So temperature will have huge effect on solubility of a saturated solution
B) the amount of extra time spent stirring the solution will hardly any effect or may have a very little effect. As stirring helps in solubility and if we have a saturated solution then it will not affect the solubility of the solution
C) The solubility is affected by the pressure on solvent
For gaseous solute the solubility is proportional to the pressure exerted on the solvent. More the pressure more the solubility.
D) the other solutes may affect the solubility as they may react with the solute or may interfere with the solute solvent interaction
Hence answer is "B"
Will fluorine form an anion or a cation? Why?
What is the percentage of nitrogen in N2O? Show all calculations leading to an answer. Help
A waste collection tank can hold 18,754 kg of methanol, which has a density of 0.788 g/cm3. What is the volume of the waste collection tank?
Explanation:
Density is defined as the mass of the substance divided by the volume of the substance.
Mathematically, Density = [tex]\frac{mass}{volume}[/tex]
Since, it is given that mass is 18,754 kg and density is 0.788 g/[tex]cm^{3}[/tex]. We know that there are 1000 grams in 1 kg.
So, 18,754 kg equals 18,754000 grams.
Hence, calculate the volume of the waste collection tank as follows.
Density = [tex]\frac{mass}{volume}[/tex]
0.788 g/[tex]cm^{3}[/tex] = [tex]\frac{18754000 g}{volume}[/tex]
volume = 23799492.38 [tex]cm^{3}[/tex]
It is known that 1 [tex]cm^{3}[/tex] equals 0.001 liter. So, 23799492.38 [tex]cm^{3}[/tex] equals 23799.49 liters.
Thus, we can conclude that volume of the waste collection tank is 23799.49 liters.
Answer : The volume of the waste collection tank is 23799.5 L
Explanation :
Density : It is defined as the mass contained per unit volume.
Formula used for density :
[tex]Density=\frac{Mass}{Volume}[/tex]
Given :
Mass of methanol = 18754 kg = 18754000 g (1 kg = 1000 g)
Density of methanol = [tex]0.788g/cm^3[/tex]
Now put all the given values in the above formula, we get:
[tex]0.788g/cm^3=\frac{18754000g}{Volume}[/tex]
[tex]Volume=23799492.38cm^3=23799492.38mL=23799.5L[/tex]
Conversion used : [tex](1cm^3=1mL=0.001L)[/tex]
Therefore, the volume of the waste collection tank is 23799.5 L
State the total number of electrons occupying the p orbitals in one chlorine atom?
Lakshmi has a sample of ammonium nitrate (NH4NO3) that has a mass of 40.10 g. She knows that the molar mass of NH4NO3 is 80.0432 g/mol. To the correct number of significant digits, how many moles of NH4NO3 does the sample contain?
0.50
0.500979
0.500980
0.5010
HElP ASAP Please! brainliest aswell: If 56 grams of carbon monoxide burns in oxygen to produce 88 grams of carbon dioxide, the mass of oxygen involved in the reaction is
A.32
B.56
C.88
D.144
A book is sitting on the table at rest. The forces acting on the book include _______, and these forces are _______.
A.
gravity pushing up and friction pushing to the right; balanced
B.
gravity pushing down and the table pushing up; unbalanced
C.
gravity pushing down and the table pushing up; balanced
D.
gravity pushing up and friction pushing to the right; unbalanced
c. this is the real answer lol
Final answer:
A book is sitting on the table at rest. The forces acting on the book include gravity pushing up and friction pushing to the right, and these forces are balanced. So the correct option is C.
Explanation:
The force acting on a book sitting at rest on a table is gravity pushing down and the table pushing up with a normal force. Since the book is at rest, these forces must be equal in magnitude but opposite in direction, and therefore they are balanced. Option C, gravity pushing down and the table pushing up; balanced, is the correct answer. The force of gravity is also known as the book's weight, and since the book is not accelerating, the normal force must be equal to the gravitational force to maintain equilibrium, according to Newton's first law of motion.