Answer:
c
Explanation:
chemical decomposition produced by passing an electric current through a liquid or solution containing ions.
Sara wants to see if a new brand of hair dye lasts longer than the brand she currently uses. She puts the new hair dye on the left side of her head and the old brand on her right side. After 2 weeks she observes which side of her head has more gray hair showing through.
a. Independent Variable =
b. Dependent Variable =
c. Constant =
Answer:
a: the hair dye
b: the change in color of her hair
c: the same amount of hair for both dyes and the same amount of dye
Explanation:
A gas has a volume of 29.3 L at 28.8 atm. What will its volume be if the pressure is changed to 16.5 atm?
Answer:
P₁V₁=P₂V₂
29.3 * 28.8 = 16.5* V₂
V₂ = 51.14 L
Describe what causes two atoms to bond together to forms a molecule . Your description should include force , potential energy and electrons
Due to its position, an object has the ability to store energy. For instance, when a demolition machine's heavy ball is held in an elevated position, it is storing energy.
What is Potential energy?Potential energy is the name for this positional energy that has been stored. Similar to how a drawn bow can store energy due to its posture. There is no energy in the bow while it is in its normal position, or when not drawn.
The bow can yet store energy when its position is changed from its normal equilibrium position because of its position.
Potential energy is the name for this positional energy that has been stored. Potential energy is the energy of position that a thing has stored inside it.
Therefore, Due to its position, an object has the ability to store energy. For instance, when a demolition machine's heavy ball is held in an elevated position, it is storing energy.
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29. Molecule H-F has a polar covalent bond because: (1 point)
a. lonisation energy of fluorine is greater than Hydrogen.
b. Hydrogen is a smaller Atom.
c. Electronegativity of Fluorine is greater than Hydrogen.
d. Fluorine has a greater tendency to pull the shared pair of electrons towards itself
Answer:
D
Explanation:
This question is a little strange. C and D are very similar, but I would pick D.
Fluorine actually has the highest electronegativity of all the elements. This allows it to pull more electrons towards itself. Since electrons have a negative charge, this causes the fluorine end of the molecule to be more negative while the hydrogen is left striped of electrons and has it positively charged necleus exposed. This means that one end of the molecule is positive while the other is negative, which makes this molecule polar. The only reason I would pick D over C is that D addresses the second part of the question about the covalent bond. A covalent bond is simply when two atoms share electrons.
Let me know if this was right and I hope it helps.
Why is glass a good insulator? a.the atoms in glass do not hold on tightly to their negatively charged particles. b the atoms in glass do not hold on tightly to their positively charged particles. c the atoms in glass hold on tightly to their negatively charged particles. d the atoms in glass hold on tightly to their positively charged particles.
Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles , Option D is the correct answer.
What is an insulator ?
Insulators are those substances that do not conduct heat or electricity like their conductor counterparts.
Conduction of electric charges is as a result of the free flow of electrons in the atom of the substance.
Hence, a good insulator holds on tightly to its electrons and prevent them from flowing freely to conduct electric charges.
Therefore, Glass is known to be a good insulator because atoms in glass hold on tightly to their positively charged particles.
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B. Atoms in glass hold tightly to their negatively charged particles
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Why is knowing density important to us? Give a reasonable answer please don’t copy what the internet has I already tried doing that I can’t
Answer:
without density, we wont be able to determine what substance will float
A tank is full of water. Find the work w required to pump the water out of the spout. (use 9. 8 for g. ) w = n a = 4 b = 4 c = 12 d = 3
The work w required to pump the water out of the spout will be 705600 joules.
What is work done?Work done is defined as the product of applied force and the distance through which the body is displaced on which the force is applied.
Work against gravity is done on a thin layer of liquid with a width of y. The vertex of the trough serves as the center of our coordinate system.
It is obvious that the cross-section of the triangle has length y at a height y. A thin layer at height y is a rectangular box with a volume of 8 y , and lifting it requires a force equal to;
[tex]\rm F= \rho gV \\\\\rm F= 9.8 \times 10000 \times 8y \triangle y \\\\[/tex]
The work on the layer is;
[tex]\rm W= 78400 y \triangle y [4-y]\\\\\ W= \int\limits^3_0 {x} \, dx \\\\\ W= \int\limits^3_0{78400y[4-y]} \, dx \\\\\ W=705600 \ Joule.[/tex]
Hence, the work w required to pump the water out of the spout will be 705600 joule.
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Which type of chemical reaction is represented by this equation
Answer:
2
Explanation:
2 balances out the equation
is dissolving a physical energy
Answer:
Yes
Explanation:
Dissolving makes what is being dissolved and makes it mix with the water no longer holding its original shape. Dissolving may also change the color or texture of the liquid it is dissolved in. These are all physical changes.
The world's deserts are typically found at 30°N and 30°S latitudes because of ________. the circulation around the Ferrel cells the circulation around the Hadley cells the circulation around the Polar cells none of the above
Answer: The circulation around the Hadley cells
Explanation:
The world's deserts are typically found at 30°N and 30°S latitudes because of the circulations around the Hadley cells. Thus, the correct option is B.
How does sir circulates around Hadley cells?Within each cell, the air moves in a circular motion. Taking the Hadley cell, the warm air at the equator (0° latitude) rises and then cools down in the upper atmosphere, and then circles back down towards the tropics of around 30° latitude.
As the air leaves equator, it rains away more moisture, becoming denser and slightly cooler in temperature, until it finally dry, sinks, and creates the arid bands where many of the world's famous deserts lie. This giant atmospheric conveyor belt, is called a Hadley cell, brings both the tropical rain forests and deserts.
Therefore, the correct option is B.
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Identify the generic outer electron configuration for the noble gases
The generic outer electron configuration for the noble gases is ns₂ np₆. All noble gases have fully completely shell.
What are noble gases?Noble gases are all monatomic gases, which all are odorless and colorless with very less reactivity.
All noble gases have completely filled s and p orbitals.
Generally, S orbital contain 5 electrons and p orbital contain 6 electrons
Helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive radon (Rn) are all noble gases.
Thus, the generic outer electron configuration for the noble gases is ns₂ np₆.
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Fill in the left side of this equilibrium constant equation for the reaction of ammonia , a weak base, with water
The equilibrium constant equation for the reaction of ammonia , a weak base, with water is K=[NH₄⁺][OH⁻] / [NH₃].
What is equilibrium constant?Equilibrium constant is a number that expresses the connection between the quantity of products and reactants present at equilibrium in a reversible chemical reaction.
Given chemical reaction is:
NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq)
Equilibrium constant equation for the above reaction will be represent as:
K = [NH₄⁺][OH⁻] / [NH₃]
As value of pure water is 1 for the above equation.
Hence equilibrium constant equation for the reaction of ammonia is K=[NH₄⁺][OH⁻] / [NH₃].
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A voltaic cell differs from an electrolytic cell in that in a voltaic cell.
Answer:
they are opposite in function
Explanation:
voltaic cell converts chemical energy to electrical energy through redox reactions i.e reduction-oxidation reaction while the electrolytic cell converts chemical energy to electrical energy.
When an acid and alkali react to form water and salt it is called:.
The reaction of acids with alkalis or bases forming salts is called neutralization reaction. Neutralization reaction remove the acidity or basicity of the substance.
What is neutralization?There are various kinds of reaction namely substitution reactions, displacement reactions, combination reaction, neutralization reactions, oxidation etc.
Neutralization reactions are those where, an acid neutralizes a base or vice versa. The product obtained will be neutral thus having no acidity or basicity as the name suggests.
For instance when HCl reacts with the base NaOH, the salt NaCl is formed which is neutral thus having the pH value of 7. Similarly, Acetic acid and KOH reacts together to form potassium salt of acetic acid or potassium acetate. These are all neutralization reactions.
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calculate the molarity when 28.91 grams of nacl is dissolved in 352 ml of water
Answer:
divide the number of moles of NaCl by the volume of the solution. In this case that is 0.32 moles, NaCl split by 3.4 L gives 0.094 M NaCl.
Ethylene, a gas found in nature, is commonly used to ripen bananas and other fruits. which compound is ethylene? 2 c h 2 are single bonded to each other, and both are single bonded to the same o. a skeletal model with a chain beginning with o h, then line segments going up, down, up and ending at another o h. 2 carbons are double-bonded to each other; the pair are single bonded to h above left, above right, below right, and below left. two carbons are triple bonded to each other; each is single bonded to h to the outside.
Ethylene is a compound in which two carbons are double-bonded to each other and bonded to 2 hydrogen atoms.
What is the chemical formula of ethylene?Ethylene has a chemical formula [tex]C_2H_4[/tex].
Thus, the 2 carbon atoms are bonded to one another by a double bond. Each of the carbon atoms then bonds with 2 hydrogen atoms to complete their octet state.
The structure is as below:
[tex]H_2[/tex]-C=C-[tex]H_2[/tex]
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Answer:
its a
Explanation:
trust
Calculate the value of ka for acetylsalicylic acid
The value of Ka for acetylsalicylic acid will be calculated as Ka=(x+a)²/x.
What is Ka?Ka is known by the name of acid dissociation constant and for weak acid HA at equilibrium Ka will be calculated as:
Ka = [H⁺][A⁻] / [HA]
Chemical equation with ICE table for the acetylsalicylic acid will be shown as:
C₉H₈O₄(aq) + H₂O(l) ⇄ C₉H₇O₄(aq) + H₃O⁺(aq)
Initial: x 0 0
Change: -a +a +a
Equilibrium: x-a x+a x+a
So, Ka for acetylsalicylic acid will be calculated by putting values on the above equation as:
Ka = [x+a][x+a] / [x-a]
Value of a is negligible as compared to the value of x of acetylsalicylic acid so the term x-a becomes x and equation will be written as:
Ka = (x+a)² / x
By knowing the all values of concentration we can calculate the value of Ka.
Hence Ka value for acetylsalicylic acid will be calculated by using the formula as Ka = (x+a)² / x.
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N2 + 3H2 to 2NH3 In a certain reaction you start with 4 moles of nitrogen and 10 moles of hydrogen. how many miles of the excess reactant will be left over
Answer:
Explanation:
We know that for every mole of nitrogen consumed, 3 moles of hydrogen are consumed.
For the nitrogen, this means the reaction can occur 4/1 = 4 times.For the hydrogen, this means the reaction can occur 10/3 = 3.33 times.So, hydrogen is the limiting reactant, and if 10 moles of hydrogen are used, then the reaction will occur 3.33 times.
Hence, this means there is enough nitrogen left for the reaction to occur another 0.67 times, and hence 0.67 moles of nitrogen will be left over.
How does breaking up a sugar cube that sits on the bottom of the glass affect its ability to dissolve in your iced tea?
Answer:
yeah.. u cant only if heated the iced tea, breaking the sugar cube up has no effect on the dissolving process.
What is the ph of a solution with [h3o ] = 2. 3 x 10-4 m
The pH of a solution with [H₃O⁺] = 2.3 × 10⁻⁴M is 3.64 means the solution is acidic in nature.
How do we define pH?pH of any solution is define as the negative logarithm of the concentration of hydronium ion as:
pH = -log[H⁺]
Given that concentration of H₃O⁺ or H⁺ = 2.3 × 10⁻⁴M
On putting values, we get
pH = -log(2.3 × 10⁻⁴)
pH = -(-3.64) = 3.64
Hence required pH value is 3.64.
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9 Ethanedioic acid, HO₂CCO₂H, can be oxidised by KMnO4 in dilute sulfuric acid. The products of this reaction are carbon dioxide, water, potassium sulfate and manganese(II) sulfate. In this reaction each ethanedioic acid molecule loses two electrons as it is oxidised. A half-equation for this process is shown. HO₂CCO₂H →→ 2CO₂ + 2H+ + 2e™ How many water molecules are produced when five ethanedioic acid molecules are oxidised by KMnO4 in dilute sulfuric acid? A 5 B 8 C 10 D 16
The oxidation reaction is the chemical reaction in which the species loses electrons. The five oxidized ethanedioic acid molecules will produce 8 water molecules. Thus, option B is correct.
What is the half-reaction equation?Half reaction equations are the representation of the reduction and the oxidation half of the whole reaction that denotes the gaining and losing of electrons differently.
The oxidation half of the reaction is given as:
HO₂CCO₂H → 2CO₂ + 2H⁺ + 2e⁻
The reduction half of the reaction will be given as:
MnO₄ + H⁺ → Mn²⁺ + H₂O
The overall reaction is written as:
C₂O₄ ⁻² + MnO₄⁻ + H⁺ → CO₂ + H₂O + Mn²⁺
Here electrons are lost in the formation of carbon dioxide and electrons are gained when manganese is produced.
The total reaction is given as:
5 C₂O₄ ²⁻ + 2MnO₄ ⁻ + 16H⁺ → 10CO₂ + 8 H₂O + 2 Mn²⁺
Therefore, option B. five ethanedioic acid molecules produce 8 water molecules.
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If you have 20 grams of carbon-14 and it goes through 2 half lives, how much carbon-14 is left?
Answer:
it would be 25% sorry if I'm wrong
It is urgent !!!!
what is the specific heat of a substance that took 5000 j to change 20 k and has a mass or 3 kg?
Answer:
h=5000j
change in temperature=20k
m=3kg
using C=H÷M×Change in temperature
C=5000÷3×20
C=5000÷60
C=83.33jkg-1k-1
You have a solution of silver nitrate with an unknown concentration. To determine the concentration, you devise a method of adding an excess of calcium metal to 100.0 cm3 of solution and collecting the silver by filtration.
2AgNO3(aq)+Ca(s)→Ca(NO3)2(aq)+2Ag(s)
If 0.201 g of silver was collected, calculate the concentration of the silver nitrate solution in
mol dm−3.
Answer with the numerical value of the concentration to three significant figures, but do not include the units.
The concentration of the silver nitrate solution is 1.86 moles/dm³ .
What do you mean by concentration ?The concentration of a substance is the quantity of solute present in a given quantity of solution.
2AgNO₃(aq)+Ca(s)→Ca(NO₃)₂(aq)+2Ag(s)
0.201 g of Silver = 0.201/107.8 = 0.00186 moles
From the equation we can see that for 2 moles of Silver to form we need 2 moles of silver nitrate .
For 0.00186 moles we will need 0.00186 moles of Silver nitrate
The concentration of the solution can be determined as
Molarity = moles / L of solution = 0.00186 moles/l
or 0.00186 moles/cu.cm = 1.86 moles/dm³
Therefore the concentration of the silver nitrate solution is 1.86 moles/dm³ .
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What determines whether or not a substance will dissolve?.
More than one-third of all accidental fires in food-service operations are caused by
Fire is a risk in all commercial kitchens. Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires.
What is an accidental fire?
Accidental fires are those in which the proven cause does not involve any deliberate human act to ignite or spread the fire.
Open flames, grease, poor house-keeping practices, electrical hazards and flammable materials are common causes of restaurant fires. Employers must implement effective administrative controls to protect employees and the business from the dangers of fire.
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What mass of nitrous oxide gas (N2O) is contained in 40.0 L balloon at a pressure of 130.0 kPa and a temperature of 25 °C?
**I NEED ANSWERS STEP BY STEP PLEASE**
The mass of the N₂O in the given question is 92.4g.
What is the moles of N2O in the given conditions?STEP1- Apply the ideal gas equation
PV=nRT
STEP2- Put the given values in the equation
P=130kPa, T=298K, V=40L R=8.31
STEP3- Solve the equation
N=PV/RT,
N=130×40/8.31×298
N=2.1moles
N=mass/molecular mass
mass=2.1×44
mass = 92.4g
Hence, the mass of N₂O is 92.4g.
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Name these compounds according to IUPAC. (ASAPP)
Answer:
but-1-ene
Explanation:
Solving :
⇒ 4 carbon atoms (but-)
⇒ One double bond (-ene)
⇒ Bond is present on the 1st carbon atom
Hence, the IUPAC name is :
but-1-ene
The molar mass of hydrogen (H) is 1 g/mol, the molar mass of chlorine (Cl) is 35 g/mol, and the molar mass of zinc (Zn) is 65 g/mol. When 130 grams of zinc react completely in hydrochloric acid (HCl), how much is the total mass of the products
The total mass of the product will be 137 grams.
Stoichiometric calculationsFrom the equation of the reaction:
[tex]Zn + 2HCl --- > ZnCl_2 + H_2[/tex]
Mole of 130 grams of Zn = 130/65 = 2 moles
Equivalent mole of [tex]ZnCl_2[/tex] = 1 mole = 1 x135 = 135 grams
Equivalent mole of [tex]H_2[/tex] = 1 mole = 1 x 2 = 2 grams
Total mass of the products = 135 + 2 = 137 grams.
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ASAP!!!!!!!!!!
difference between a commercial and natural indicator
Answer:
When a substance is added into a solution then its color will change with different kind of solution then such type of substance can be considered as indicator. . They can be synthetic as well as an olfactory indicator
Explanation:
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