Answer:
Incisors: These are the teeth at the front of the mouth and the most visible ones when we smile. Bicuspids: Also called premolars, the bicuspids come after the canines and are flatter than the canines and incisors. Molars: At the back of your mouth, you'll find wide, flat molars.
Explanation:
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When the same quantity of electricity was passed through a dilute solution of sodium hydroxide and through a molten solution of lead bromide, 0.050 mol of lead was produced. what amount (in mol) of hydrogen gas was evolved
0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.
What amount in moles of hydrogen will be produced?The amount in moles of hydrogen produced when the same quantity of electricity is passed through different electrolytes is inversely proportional to the charge on the ions.
The charge on the Lead ion is +2.
The charge on the hydrogen ion is +1.
2 atoms of hydrogen gives one molecule of hydrogen gas.
Hence, equal charge liberates equal amounts in moles of lead and hydrogen gas.
Therefore, 0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.
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Which two factors decrease as the averagespeed of the particles in a sample
of matter decreases?
o a. the average mass of the particles
b. the temperature of the sample
o c. the weight of the sample
d. the average kinetic energy of the particles
Answer:
d the average kinetic energy of the particles
Select the correct answer. Which statement is true of a chemical change? A. It involves changes in the molecular structure. B. It involves changes in phase but not changes in the molecular structure. C. It involves dissolving one substance into another. D. It involves a change in the state, or phase, of a substance. E. It involves the process of separating two or more dissolved substances.
125 grams of HCl are used. Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g). What is the percent yield if 1.2 moles of hydrogen are actually produced?
Answer:
70%
Explanation:
To find the percent yield, you need to (1) convert grams HCl to moles (via molar mass from periodic table), then (2) convert moles HCl to moles H₂ (via mole-to-mole ratio from equation), then (3) calculate the percent yield H₂ (via percent yield equation).
Zn (s) + 2 HCl (aq) --> ZnCl₂ (aq) + 1 H₂ (g)
Molar Mass (HCl): 1.008 g/mole + 35.45 g/mole
Molar Mass (HCl) = 36.458 g/mole
125 g HCl 1 mole HCl 1 mole H₂
--------------- x ------------------ x ------------------ = 1.7 moles H₂
36.458 g 2 moles HCl
(actual yield / theoretical yield) x 100% = percent yield
theoretical/calculated yield = 1.7 moles H₂
actual yield = 1.2 moles H₂
(1.2 moles H₂ / 1.7 moles H₂) x 100% = 71%
Therefore, the best percent yield of hydrogen produced is 70%.
In which condition does barium chloride conduct electricity? And why
Answer:
When barium chloride (BaCl 2) is dissolved in water, the water conducts electricity. In what form will the dissolved BaCl 2 be found? a. as Ba 2+ and Cl - ions b. as Ba atoms and Cl 2 molecules
Explanation:
Fe(no3)3 + na0h > fe(oh)3 + nano3 is balanced or unbalanced?
Answer:
Unbalanced
Explanation:
[tex]\text{Fe}(\text{NO}_3)}_3+ \text{NaOH} \rightarrow \text{Fe(OH)}_3 + \text{NaNO}_3\\\\\text{Balanced reaction:}\\\\\text{Fe}(\text{NO}_3)}_3+ 3\text{NaOH} \rightarrow \text{Fe(OH)}_3 + 3\text{NaNO}_3[/tex]
Which of the following is an engineer's solution to a problem?
OA. Searching for the existence of planets around a distant star
OB. Designing shatter-resistant windows for a car
C. Observing the reaction when two substances are combined
D. Recording species of plants that inhabit an island
An engineer's solution to a problem would involve designing shatter-resistant windows for a car.
Who is an engineer?An engineer is a person who applies the knowledge of science to design tools and equipment which are used to solve the problems facing man.
An engineer specializes in the scientific field of engineering.
Some tools or devices produced by engineers are machines and vehicles such as cars and aeroplanes.
Therefore, an engineer's solution to a problem would involve designing shatter-resistant windows for a car.
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Is industry pool or flux
Answer:
What is the difference between pools and fluxes?
Image result for Is industry pool or flux
Fluxes describe the movement of energy and matter between different pools. When you pour a glass of juice for yourself, the juice bottle and the glass are both “pools” for the apple juice. The act of pouring it from the bottle to the glass is the flux
Explanation:
Click the game tab at the bottom of the simulation and select level 1. (there is no seesaw balance for this part of the activity.) balance the first equation, and click check to see if you got it right. if you can't balance it in the first try, you can try again. work through the five equations for level 1. click continue to go on to level 2, and later level 3. each level is more difficult than the one before. keep trying until all the equations are balanced. in one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.
The strategy for balancing the equations is by looking at the number of atoms on each side of the equation and adding coefficients to the molecules.
What is a balanced equation?A balanced equation is an equation for a chemical reaction where the number of atoms for each element in the reaction and the total charge is the same for the reactants and the products,
A strategy that will help balance equations more quickly is balancing by inspection. Here, you look at how many atoms you have on each side of the equation and add coefficients to the molecules to balance out the number of atoms.
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4 FeS₂ + 11 0₂ → 2 Fe₂O3 + 8 SO₂
How many moles of O2 are required to react completely with 10.5 moles of FeS2
From the equation, we see that for every 4 moles of pyrite consumed, 11 moles of oxygen are consumed.
So, the answer is (10.5/4)(11) = 28.875 mol
Explain what is meant by the phrase 'the heat death of the universe."
Answer:
See explanation.
Explanation:
Are you literally posting your entire you chemistry homework on this site, one question at a time? Anyways, the heat death refers to the second law of thermodynamics and entropy. Heat is constantly flowing from warmer to cooler objects and never the other way around. This heat flow increases entropy, which is constantly increasing. The universe will eventually disperse all of its heat energy away to continuously increase entropy and reach a limit as the temperature reaches 0 K at which point all molecular motion will cease and so will the life of the universe.
Answer:
hypothesis on the ultimate fate of the universe, which suggests the universe would evolve to a state of no thermodynamic free energy and would therefore be unable to sustain processes that increase entropy.
Explanation:
How much iodine (I2), in grams, should be added to water to produce 2.5L of solution with a molarity of 0.56M?
Molarity=Moles of solute/Volume of solution in L
So
0.56M=moles/2.5Lmoles=0.56(2.5)moles of Iodine=1.4molMads of Iodine
Moles(Molar mass)1.4(126.9)177.66g6. a sample of nitrogen gas occupies 28.5 l at stp. how many moles of nitrogen are present?
Answer:
1 mol of N2
Mole of N2= 28.5 L × -------------------
22.4 L of N2
=1.272 mole of N2
What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
Please show the work <3
Answer:
2.68 Liters
Explanation:
ideal gas law
PV=NRT
to get the volume
rearrange the formula
V=nRT/P
R molar gas constant is in units joules per mole kelvin :
8.314 J/(mol K) (joules per mole kelvin)
T temperature part of this is in kelvin so you have to convert the Celsius temperature to kelvin
1 Celsius is 274.15 kelvin so
83.4 Celsius is 356.55 kelvin
P pressure is in Pascal or Pa units
so you have to convert atm into Pa
1 atm is 201636.8 Pa or Pascals so
1.99 atm is 201636.8 Pa
V volume will be in cubic meters or m^3
m^3 will need to changed to liters
1 cubic meter or m^3 is 1000 liters
n amount of substance is in moles
again the rearranged formula is
V=nRT/P
(0.182*8.314*356.55)/201636.8 =
0.00267566693 cubic meters or m^3
1 cubic meter or m^3 is 1000 liters so
0.00267566693 cubic meters or m^3 times 1000 =
2.67566693 liters
Microwaves are used to cook food and transmit information.
What is the wavelength of a microwave that has a frequency of 3.44×10^9 Hz?
[tex]\\ \rm\Rrightarrow \lambda=\dfrac{c}{\nu}[/tex]
[tex]\\ \rm\Rrightarrow \lambda=\dfrac{3\times 10^8}{3.44\times 10^9}[/tex]
[tex]\\ \rm\Rrightarrow \lambda=0.872\times 10^{-6}[/tex]
[tex]\\ \rm\Rrightarrow \lambda=0.9\mu m[/tex]
49. How much precipitate would result if you have 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation
a. 5g
b.70 g
c. 35g
d. 13g
Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.
What is Solubility ?the maximum quantity of a substance that will dissolve in a certain quantity of water at a specified temperature.
From the Solubility Graph of NaCl , we can see that the solubility of NaCl at 10 C is around 36.5gm/L.
If it is cooled down to saturation we will see the precipitate forming and that will be equal to the difference of solute present and the solubility.
As it is given that 50gm of solute is present
The precipitate will be 50- 36.5 gm, = 13.5 gm.
Therefore Option D is the correct answer , 13.5gm of precipitate would result if 50 grams of NaCl at 10 degrees Celsius and its cooled to saturation.
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What general trend does electronegativity follow on the periodic table?
Answer:
On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group. As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.
Using a pipette, dispense a drop of water on a level glass surface. Compare the shape of this drop with the shape of the water drop on the waxed paper.
Oil drop on waxed paper is less dispersed since it has non-polar interactions therefore occurs circular in shape.
What is polar interaction?Polar interactions are the strong and long-range interactions between molecules that are based on electrostatic attraction.
In this case, the shape of this drop with the shape of the water drop on the waxed paper is that the oil drop on waxed paper is less dispersed since it has non-polar interactions
Also, oil and water do not have any interactions so the oil drop is more dispersed and occurs to be oval in shape.
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How many moles of Calcium Oxide are needed to produce 4 moles of Calcium Hydroxide?
Taking into account the reaction stoichiometry, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
Reaction stoichiometryIn first place, the balanced reaction is:
CaO + H₂O → Ca(OH)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CaO: 1 mole H₂O: 1 moleCa(OH)₂: 1 moleMoles of CaO requiredThe following rule of three can be applied: If by stoichiometric reaction 1 mole of Ca(OH)₂ is produced by 1 mole of CaO, 2 moles of Ca(OH)₂ are produced by how many moles of CaO?
[tex]moles of CaO=\frac{2 moles of Ca(OH)_{2}x1 mol of CaO }{1 mole of Ca(OH)_{2}}[/tex]
moles of CaO= 2 moles
Finally, 2 moles of CaO are required to react with 2 moles of Ca(OH)₂.
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How many grams of aluminum chloride can be produced from 7.32g of ammonium perchlorate?
Answer:
2.77g of [tex]AlCl_{3}[/tex] can be produced.
Explanation:
Use stoichiometry.
Balanced equation: [tex]3Al + 3NH_{4} ClO_{4}[/tex] ⇒ [tex]Al_{2} O_{3} + AlCl_{3} +3NO + 6H_{2} O[/tex]
[tex]NH_{4} ClO_{4} : AlCl_{3}[/tex]
3 : 1 **[tex]n=\frac{m}{M}[/tex]
0.0623** : [tex]x[/tex] [tex]n=\frac{7.32}{117.49}[/tex] = 0.0623
[tex]3x=0.0623\\x=0.020767[/tex]
[tex]n=\frac{m}{M}[/tex]
[tex]m=nM[/tex]
m= (0.020767)(133.34)
m= 2.77g
help me plss ty in advanced
Answer:
See below ~
Explanation:
The respective pairs are :
× Ribose ⇒ The sugar of RNA
× Double helix ⇒ Structures of DNA
× Watson & Crick ⇒ Proposed the double helix model
× Base pair ⇒ Adenine - Thymine pair
× Cytosine ⇒ The nucleotide pair of Guanine
What is the name of this structural formula?
Answer:
3-methyl pentane
Explanation:
The longest chain of carbons is 5, so it will have the prefix pent-.
The first branch is on the 3rd carbon, and it is a 1 carbon branch. This means the branch will be called 3-methyl.
Now to find the suffix we need to count the carbons and the hydrogens. There are 6 carbons and 14 hydrogens, which follows the formula for an alkane ([tex]C{_n}H{_{n+2}}[/tex]). This gives it the suffix -ane.
Now we can name the compound:
3-methyl pentane
That is the answer
- Kan Academy Advance
using are organic compounds made by living things
Answer:
The chemical compounds of living things are known as organic compound because of their association with organisms and because they are carbon-containing compounds, which are the compounds associated with life processes, are the subject matter of organic chemistry
is calcium hydroxide a strong alkali? if no, why? if yes, why? i really don’t understand
Answer:
Yes
Explanation:
Neither Calcium nor hydrogen nor oxygen are alkali metals
Alkali metals are Group 1 elementsThey are very soft and mellable.H,Li,Na,K,Cs,Fr are included in it however H is not a actual memberHere
Ca(OH)_2 is the compound
Vant Hoff factor is 3
As it's greater than 1 it's a very strong base .
The pOH of this comes around 1.5 to 1.3
So very heavy ionic dissociation
Strong Alkali
Calcium hydroxide [tex] \sf \: Ca(OH)_2[/tex] is a really strong alkali or base since it has the power to accept proton when added to a solution.. Its pH is 9 and we know that when the pH is more than 7 it is a base..
One more reason why calcium hydroxide is a strong alkali is that it dissociates completely when added to any solution...
How many grams are in 0.50 moles of LiBr?
A bottle contains 3.100 ml of a liquid. the total mass of the bottle and the liquid together is 6.300 g. the mass of the empty bottle is 4.240 g. what is the density of the liquid?
The density of the liquid in the bottle will be 0.665 g/mL
What is density?Mathematically, density is given as:
Density = mass/volume
Mass of liquid = mass of bottle + liquid - mass of empty bottle
= 6.3 - 4.24 = 2.06 g
volume of liquid = 3.100 mL
Density of liquid = 2.06/3.100 = 0.665 g/mL
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the diagram shows a model of a water cycle which word best summarizes the process labeled x in the model? A. Commensalism B.Photosynthesis C. precipitation D. Evaporation
Answer:
D evaportaion. it shows the sun evaporating the lake.
What is the name of this structural formula?
Answer:
2-methylbutane
Explanation:
First, you want to identify the largest number of sequential carbons. In this case, the parent chain is made up of 4 carbons. This makes the base name, butane.
Next, you want to identify any branches. There is a branch made up of 1 carbon, and these are referred to as a methyl group. The lowest possible carbon on the parent chain this branch is attached to is the second carbon.
When you put these factors together, you are left with the name: 2-methylbutane.
In the chemical equation 4Fe + 3O2 → 2Fe2O3, 20.99 grams of iron (Fe) are needed to produce 30.01 g of Fe2O3.
True or False?
During dehydration synthesis, an enzyme removes a ____________ functional group from the monomers of one organic molecule and a hydrogen from another monomer, linking monomers together to form a ____________ . This chemical reaction also forms ____________ .
Linking monomers together to form a polymer .This chemical reaction also forms water molecules.
What is Polymerization?This is a type of reaction which involves the linking of two or more monomers to form a polymer.
Dehydration reaction forms water molecules as part of the product thereby making it the most appropriate choice.
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