Answer:
Explanation:
a) the units of the constants 200 and 10 are as follows:
unit of 200 = unit of r / unit of D
= crystals/min× mm
= crystals / (min×mm)
unit of 10 = unit of r / unit of D^2
= crystals/min × mm²
= crystals / (min×mm²)
b) The objective here is to determine the crystal nucleation rate in crystals/s corresponding to a crystal diameter of 0.050 inch; T o do that ; let's first convert the inch to mm
We all know that
1 inch = 25.4 mm
0.050 inch = 0.050 ×25.4 mm
= 1.27 mm
nucleation rate = 200×D - 10×D²
= 200×1.27 - 10×(1.27)²
=237.9 Crystals/min
=237.9/60 crystals/sec
= 3.96 crystals/sec
c) Derive a formula for r(crystals/s) in terms of D(inches). (See Example 2.6-1.) Check the formula using the result of Part b.
r(crystals/sec)=A D−B D² (D in inch)
unit of 200= crystals / (min×mm)
unit of 10=crystals / (min×mm² )
A = 200 crystals / (min×mm) × 1/60 min/sec ×25.4 mm/inch
= 84.7 crystals/(sec-inch)
B = 10 crystals / (min×mm² ) × 1/60 min/sec ×25.4 mm/inch×25.4 mm/inch
=107.5 crystals/(sec-inch)
What is the purpose of the arrow in a chemical equation?
O A.
It indicates the direction in which the reaction occurs.
Св.
It separates the elements from the compounds.
O C.
It indicates the direction of increase in the number of molecules.
D.
It indicates the direction of heat movement in a reaction.
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Next
Answer:
A) It indicates the direction in which the reaction occurs.
Explanation:
The reason we don't use equals signs (=) in chemical reactions is because of the Identity Property of Equality (if a = b then b = a), which would allow us to reverse reactions. Reactions can't just be reversed (since some don't even occur); we need to know what is reacting to make what. Thus, we use the arrow, or yields symbol to denote this.
The substances to the left of the sign are the reactants, the ones that are reacting, and the ones on the right are the products, the ones that are being produced from the reactants. The arrow is an excellent way to represent the direction the reaction occurs in as the way it's written clearly demonstrates direction.
Hope this helps!
Which is an example of antiracist behavior?
A. Tyler smiles at a joke made in his driver education class about Asian drivers.
B.Tyler makes a joke about the high number of African Americans dropping out of school.
C.Tyler suggests that an ethnic studies course be taught at his school
D. All of the above
Answer:
C.
Explanation:
In C.) Tyler is not suggesting that one race is better than another he is only suggesting his own non biased opinion on what courses should be taught at his school.
Answer:
Explanation:
C
PLEASE!
SEE ATTACHED.
Answer:
Here's what I get
Explanation:
A. Prepare Ca(NO₃)₂ solution
Scoopula — to transfer the solid to an Erlenmeyer flask
Erlenmeyer flask — to hold the solid for weighing and to prepare the solution
Volumetric flask — to hold the liquid
Funnel — to transfer the solution to the volumetric flask
Wash bottle — to fill the volumetric flask to the mark
B. Weigh K₂SO₄
Scoopula — to transfer the solid to a weighing bottle
Weighing bottle — to hold the solid for weighing.
C. Add acetic acid to a volumetric flask
Volumetric flask — to hold the acid
Pipet —to measure out the acid and transfer it to the flask
Pipet bulb — safety feature for the pipet and for control of the acid volume.
D. Add NaOH to an acid
Beaker — to hold the NaOH solution
Ring stand — to hold a buret
Buret clamp — to hold the buret
Funnel — to transfer the solution to a buret
Buret — to hold the NaOH solution for addition to the acid
Write the formula of the conjugate base for acid HF. Express your answer as a chemical formula or an ion. nothing Request Answer Part B Write the name of the conjugate base found in part A. Spell out the full name of the compound or ion. Request Answer Part C Write the formula of the conjugate base for acid H2O. Express your answer as a chemical formula or an ion. nothing Request Answer Part D Write the name of the conjugate base found in part C. Spell out the full name of the compound or ion. Request Answer Part E Write the formula of the conjugate base for acid H2CO3. Express your answer as a chemical formula or an ion. nothing Request Answer Part F Write the name of the conjugate base found in part E. Spell out the full name of the compound or ion. Request Answer Part G Write the formula of the conjugate base for acid HSO−4. Express your answer as a chemical formula or an ion. nothing Request Answer Part H Write the name of the conjugate base found in part G. Spell out the full name of the compound or ion.
Answer:
Explanation:
HF acid
F ⁻ conjugate base , name is fluoride ion .
H₂O acid
OH⁻ conjugate base , name hydroxide ion
H₂CO₃ acid ,
HCO₃⁻ conjugate base , name bicarbonate ion .
HSO₄⁻ acid bisulphate ion
SO₄⁻² ion , conjugate base ,name sulphate ion .
During trial 1, the limiting reactant is __________ because_____________________________.
A)aluminum; there was still copper left over after the reaction stopped.
B)copper chloride; there was still aluminum left over after the reaction stopped.
Answer:
B
Explanation:
How do you draw the following structural formulas: 2,4-dimethylhexane; 4-methyl-2-pentene; 4-chloro-7-methyl-2-nonyne
Answer:
The answer to your question is given below
Explanation:
1. 2,4-dimethylhexane can be drawn as follow:
a. The parent name: Hexane i.e it contains 6 carbon atom.
b. The substitute group attached: Methyl i.e CH3 and it is at carbon 2 and 4.
c. Draw 6 carbon atom in a straight line and put CH3 at carbon 2 and 4. As shown in attach photo.
2. 4-methyl-2-pentene can be drawn as follow:
a. The parent name: pentene i.e it contains 5 carbon atom and the double bond is at carbon 2.
b. The substitute group attached: Methyl i.e CH3 and it is at carbon 4.
c. Draw 5 carbon atom in a straight line and put a double bond at carbon 2 and CH3 at carbon 4 as shown in attach photo.
3. 4-chloro-7-methyl-2-nonyne can be drawn as follow:
a. The parent name: nonyne i.e it contains 9 carbon atom and the triple bond is at carbon 2.
b. The substitute group attached:
i. Chlorine (Chloro) i.e Cl and it is at carbon 4.
ii. Methyl i.e CH3 and it is at carbon 7.
c. Draw 9 carbon atom in a straight line and put a triple bond at carbon 2, Cl at carbon 4 and CH3 at carbon and 7 as shown in attach photo.
Ca+HCI—>CaCI2+H2, what is the reaction?
Answer:
single replacement reaction
Explanation:
This is a kind of single replacement reaction where you switch either cations or anions. Here you switched Ca for H and produced Cacl2 and H2 gas by itself.
Answer:
It is a displacement reaction
A solution with a concentration of 0.0640 g/L CsOH contains 1.260 g CsOH. What is the volume of the solution?
Answer:
19.7 L
Explanation:
Answer:
The answer is 19.7
Explanation:
Is glue a liquid or a solid
Answer:
White school glue is liquid because its long polymers can slide over and along one another. It does not flow easily, though; it is quite viscous. The addition of some chemicals—such as a borax solution (or sodium tetraborate decahydrate dissolved in water)—can cause cross-links to form between the polymers.
Explanation:
Answer:
It is a liquid :]
1. A chemical reaction is taking place between two reactants dissolved in a liter of water. If an
additional liter of pure water is added to the reaction mixture, what will be the effect on the
reaction rate?
Answer: The reaction rate will DECREASE.
Explanation:
Chemical reaction occurs through the combination of chemical reactants to form new products. The rate if this reaction is affected by the following factors:
- the chemical nature of the reacting substances,
- the state of subdivision (one large lump versus many small particles) of the reactants,
- the temperature of the reactants,
- the concentration of the reactants, and
- the presence of a catalyst.
When additional liter of pure water is added to the reaction mixture, collision between reactant molecules is reduced The dilution causes the concentration of the reactants to reduce. This in turn affects the rate of chemical reactions as the decreased concentration of reactants leads to a decrease in the reaction rate.
Justine’s hair dryer has a resistance of 20 Ohms when first turned on. How much current does the hair dryer draw from the 110.-V line in Justine’s house? (Answer in amps)
Answer:
5.5 amps
Explanation:
V = I*R
110 = 20I
I = 5.5
Base your answers on the graph below, which represents uniform cooling of a sample of a pure substance, starting as a gas. Solid and liquid phases can exist in equilibrium between points
Answer:
D & E
Explanation:
I think this is dealing with latent heat and D & E would be the range where you will find solid and liquid phases in equilibrium, cuz it starts as gas at from A to B, B to C is gas and liquid equilibrium, C to D is liquid, D to E solid and liquid, and then E to F is solid.
How to make crystals using table salt?
Please help I"ll mark you as the BRAINLIEST!!!
Answer:
1.heat a pan of water with just a little bit of water,have a boil
2.chosse ure salt
3.stir in has much salt has u can than take the pan off the heat
4.pour the mix into a glass jar
5.tie a string to an objeet that can lay accross the top and put just the string in ure mix
Explanation oh and look at it everyday hope that helps
can you pls tell me the net ironic equation of H₂²⁺(aq) + O₂²⁻(aq) + Mg²⁺(aq) + SO₃²⁻(aq) → Mg²⁺(aq)+SO²⁻₄(aq) + H₂O(l)
please its urgent
Answer:
H₂²⁺(aq) + O₂²⁻(aq) + SO₃²⁻(aq) → SO²⁻₄(aq) + H₂O(l)
Explanation:
H₂²⁺(aq) + O₂²⁻(aq) + Mg²⁺(aq) + SO₃²⁻(aq) → Mg²⁺(aq) + SO²⁻₄(aq) + H₂O(l)
A careful observation of the equation above, shows that the equation is already balanced.
To obtain the net ionic equation, we simply cancel Mg²⁺ from both side of the equation as shown below:
H₂²⁺(aq) + O₂²⁻(aq) + SO₃²⁻(aq) → SO²⁻₄(aq) + H₂O(l)
Hydrogen sulfate reacts with gallium chlorate to produce hydrogen chlorate and gallium sulfate(write the balanced chemical equation,and word reaction)
Answer:
[tex]3H_2S+2Ga(ClO_3)_3\rightarrow Ga_2S_3+6HClO_3[/tex]
Explanation:
Hello,
In this case, the described chemical reaction is:
[tex]H_2S+Ga(ClO_3)_3\rightarrow Ga_2S_3+HClO_3[/tex]
After balancing, we must assure the same quantity of atoms of all the elements at both reactants and products:
[tex]3H_2S+2Ga(ClO_3)_3\rightarrow Ga_2S_3+6HClO_3[/tex]
Thus, we find two galliums, three sulfurs, six chlorines, six hydrogens and eighteen oxygens at both reactants and products.
Best regards.
the half life for the reactant A in the first order reaction A-> B is 36.2 seconds what is the rate constant for this reaction
answer :
b because 24 <3
Explanation:
hdjsna surveyed I need points lol sorry for wasting time
Which of the following elements has the lowest ionization energy?
Na
C
F
He
Rb
Explanation:
Na
Na (gas) -> Na+ (g) + e-
Answer:
Rb
Explanation:
An unknown substance has a melting point of -77°C. Is this substance likely to be an ionic compound?
Answer:
No. it,s not possible.
Explanation:
Because you know that ionic compound is having large inter-molecular forces. -77C* is for a compound having v.very small inter-molecular forces.you must know that M.B is directly varing with inter-molecular forces.
Using the cell voltage measured for the first cell studied, with cell chemistry Zn/Zn^2+ \ Cu^2+/Cu, and the known half life potential for Zn^2/Zn calculate the reduction potential for Cu^2+/Cu and enter value below.
The information received for this problem were the values obtained during an online lab:
Cu xM cell voltage:1.100 V
Range: 0.005 V
Temp: 25 degrees C
Answer:
The reduction potential of [tex]Cu^2+/Cu[/tex] is [tex]E_c^o = 0.34 \ V[/tex]
Explanation:
From the question we are told that
The potential of the cell is [tex]M_{cell} = E^o _{cell} = 1.100 \ V[/tex]
The range is [tex]R = 0.005 \ V[/tex]
The temperature is [tex]T = 25 ^oC[/tex]
Note the reason why Zn is oxized and Cu is reduced is because Zn is higher than Cu on the electrochemical series
The reaction at the anode is
[tex]Zn ^{2-} _{(aq)} + 2e \to Zn_{(s)} \ \ \ \ \ E^o_a = -0.76 \ V[/tex]
The [tex]E^o\ is \ the \ standard\ oxidation \ potential\ value\ for\ Zn\ oxidation[/tex]
The reaction at the anode is
[tex]Cu^{2+} _{(aq)} + 2e^{-} \to Cu_{(s)} \ \ \ \ \ \ \ \ E^o_c = c \ V[/tex]
Now
[tex]E^o _{cell} = E_c^o - E_a^o[/tex]
substituting values
[tex]1.100 = E_c^o -(- 0.76)[/tex]
[tex]E_c^o = 1.100 - 0.76[/tex]
[tex]E_c^o = 0.34 \ V[/tex]
Hence the reduction potential of [tex]Cu^2+/Cu[/tex] is [tex]E_c^o = 0.34 \ V[/tex]
A certain half-reaction has a standard reduction potential E0red = +0.13V . An engineer proposes using this half-reaction at the anode of a galvanic cell that must provide at least 1.10V of electrical power. The cell will operate under standard conditions. Note for advanced students: assume the engineer requires this half-reaction to happen at the anode of the cell.
Required:
a. Is there a minimum standard reduction potential that the half-reaction used at the cathode of this cell can have?
b. Is there a maximum standard reduction potential that the half-reaction used at the cathode of this cell can have?
Answer:
a. 1.23 V
b. No maximum
Explanation:
Required:
a. Is there a minimum standard reduction potential that the half-reaction used at the cathode of this cell can have?
b. Is there a maximum standard reduction potential that the half-reaction used at the cathode of this cell can have?
The standard cell potential (E°cell) is the difference between the standard reduction potential of the cathode and the standard reduction potential of the anode.
E°cell = E°red, cat - E°red, an
If E°cell must be at least 1.10 V (E°cell > 1.10 V),
E°red, cat - E°red, an > 1.10 V
E°red, cat - 0.13V > 1.10 V
E°red, cat > 1.23 V
The minimum standard reduction potential is 1.23 V while there is no maximum standard reduction potential.
Calculate the number of moles of Li3PO4 in 2.2 L of a 0.60 M Li3PO4 solution.
Answer:
1.32 mole
Explanation:
The following data were obtained from the question:
Volume of solution = 2.2L
Molarity of solution = 0.60M
Mole of Li3PO4 =..?
Molarity is simply defined as the mole of solute per unit litre of the solution. Mathematically, it is represented as:
Molarity = mole /Volume
With the above formula we can easily calculate the number of mole of Li3PO4 as shown below:
Molarity =mole /Volume
0.6 = mole of Li3PO4 /2.2
Cross multiply
Mole of Li3PO4 = 0.6 x 2.2
Mole of Li3PO4 = 1.32 mole
Therefore, 1.32 mole of Li3PO4 is contained in the solution.
How many bonding electrons are present in PO43- ?
Which compound has the highest boiling point? Ethane, Propane, Butane, Pentane, Hexane
Answer:
Hexane
Explanation:
These are hydrocarbons from the same group with general formula CnH2n+2.
So, the more molecular mass are (the more number of carbons) the higher boiling point will be.
Hexane has the most number of carbon atoms(6) , so the highest molecular mass and the highest boiling point.
How does a dna molecule make a copy of itself
Answer:
See below
Explanation:
The process through which DNA replicates itself in the course of the cell division shall be DNA replication. There was a mistake. A 'Y' shape is generated by the separation of the two individual DNA strands called a 'field' replication. These two different strands act as models for the creation of new DNA strands
Hope this helps.
Combustion of hydrocarbons such as undecane (C_11H_24) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.
1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid undecane into gaseous carbon dioxide and gaseous water.
2. Suppose 0.260 kg of undecane are burned in air at a pressure of exactly 1 atm and a temperature of 13.0°C. Calculate the volume of carbon dioxide gas that is produced. Be sure your answer has the correct number of significant digits.
Answer:
Volume of carbon dioxide is 428.23 L.
Explanation:
Below is the chemical reaction or chemical equation for the combustion of hydrocarbons such as undecane into carbon dioxide.
[tex]C_{11}H_{24}(l) + 17O_{2}(g) \to 11CO_{2} (g) + 12H_2O(g)[/tex]
Here, undecane is in liquid form that reacts with gaseous oxygen (combustion) and produces carbon dioxide and water as a product in the gaseous form.
The molar mass of undecane = [tex]156.31 g/mol.[/tex]
[tex]\text{Number of moles} = \frac{260g}{156.31g/mol} = 1.66 \ mol.[/tex]
From the equation, it can be seen that 1 mole of undecane produces 11 moles of carbon dioxide. Therefore, 1.66 mol will produce 18.26 mol of carbon dioxide.
Now find the volume of 18.26 mol of carbon dioxide when the temperature is 13 degrees Celsius and pressure is 1 atm.
[tex]V = \frac{nRT}{P} \\[/tex]
[tex]V = \frac{18.26 \times 0.082 \times 286 \ K}{1atm} \\[/tex]
[tex]V = 428.23 \ L[/tex]
a container holds four times as many moles of CO2 as O2. if the total pressure in the container is 20. atm, what is the pressure exerted by carbon dioxide?
Answer:
The answer is "16"
Explanation:
In the question given, it asks about the partial carbon dioxide ([tex]CO_2[/tex]) pressure, which is directly related to the oxygen ([tex]O_2[/tex]) to carbon dioxide ([tex]CO_2[/tex]) mole ratio, which is 1 to 4.
What does a particular point on a line of a phase diagram represent ?
Answer:
What does a particular point on a line of a phase diagram represent ?
Explanation:
The lines on the phase diagram represent combinations of pressures and temperatures at which two phases coexist in equilibrium.
The phase diagram's lines depict mixtures of pressures as well as temperatures where two phases can peacefully coexist.
What is a phase diagram?A phase diagram shows a visual representation of particular chemical-physical states across various pressures and temperatures.
What is a phase?A phase would be an area of space where a molecule's physical characteristics have been all essentially uniform.
The phase diagram's lines depict mixtures of pressures as well as temperatures where two phases can peacefully coexist.
To know more about the phase diagram
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David prepared the potassium phosphate solution by adding 46.3g to 250 mL of water. Kim needs 0.10M potassium phosphate solution. How many stock solutions does she need if she wants to mix 150 ml of diluent?
Answer:
17.2mL
Explanation:
Step 1:
Determination of the molarity of potassium phosphate K3PO4 solution.
This is illustrated below:
Mass of K3PO4 = 46.3g
Molar Mass of K3PO4 = (39x3) + 31 + (16x4) = 212g/mol
Mole of K3PO4 =..?
Mole = Mass /Molar Mass
Mole of K3PO4 = 46.3/212 = 0.218 mole
Volume of water = 250mL = 250/1000 = 0.25L
Molarity = mole /Volume
Molarity of K3PO4 = 0.218/0.25
Molarity of K3PO4 = 0.872M
Step 2:
Determination of the volume of the stock solution of K3PO4 needed.
Molarity of stock solution (M1) = 0.872M
Volume of stock solution needed (V1) =..?
Molarity of diluted solution (M2) = 0.1M
Volume of diluted solution (V2) = 150mL
The volume of the stock solution needed can be obtained as follow:
M1V1 = M2V2
0.872 x V1 = 0.1 x 150
Divide both side by 0.872
V1 = (0.1 x 150)/0.872
V1 = 17.2mL
Therefore, the volume of the stock solution needed is 17.2mL
Select the correct image
Trees with light brown bark dominate an ecosystem. The ecosystem has populations of insects that thrive on the tree bark. Over time, some
Insect species developed certain physical characteristics that helped them thrive on the tree bark. These physical characteristics also helped the
Insects defend themselves from predators. Which insect species is probably the species with the new physical characteristics?
Answer:
I think the insect would be the one in the second photo reading from left to right
Explanation:
the other insects:
the first of the first photo is a change of what would be the external surface of the insect, it is not the insect itself.
In the third photo, the insect has short legs with little grip, which indicates that it does not climb large areas on top, and finally, the 4 image is of an insect that lives in desert areas and is poorly coordinated in areas of high heat. and sand.
These are the reasons why I chose photo number two reading from left to right
Answer:
I would say that your answer would be the second one.( the red one)
Explanation:
because the legs it has seem like it would grip onto trees fairly well.
PLEASEE HELPP ME WITH THIS QUESTION I REALLY NEED A GOOD EXPLANATION AND BE SPECIFIC PLEASE WILL MARK BRAINIEST FOR CORRECT ANSWER!!!!!!!!
QUESTION: Describe the three parts of a seed and give the function of each.
Answer:
The three parts of the seed are the embryo, endosperm and the seed coat.
Explanation:
The embryo is the young multicellular organism before it emerges from the seed. The endosperm is a source of stored food which consists mostly of starches. The seed coat consists of one or more protective layers that encase the seed.
Hope this helps x