Answer:
8.95 g
Explanation:
ZnCl₂ (aq) + 2 KOH (aq) → Zn(OH)₂ (s) + 2 KCl (aq)First we calculate how many ZnCl₂ moles reacted, using the given concentration and volume:
250 mL / 1000 = 0.250 L0.360 M * 0.250 L = 0.090 mol ZnCl₂Then we convert ZnCl₂ moles into Zn(OH)₂ moles [ Zn(OH)₂ is the precipitate, as it is the solid]:
0.090 mol ZnCl₂ * [tex]\frac{1molZn(OH)_2}{1molZnCl_2}[/tex] = 0.090 mol Zn(OH)₂Finally we convert 0.090 Zn(OH)₂ moles into grams, using its molar mass:
0.090 mol Zn(OH)₂ * 99.424 g/mol = 8.95 gThe mass of a substance is the product of the molar mass and the moles of the substance. The mass of precipitate formed in the reaction is 8.95 gm.
What is Mass?The mass of the substance is the weight of the compound or the molecule present in the sample.
The balanced chemical reaction is shown as:
[tex]\rm ZnCl_{2} (aq) + 2 KOH (aq) \rightarrow Zn(OH)_{2} (s) + 2 KCl (aq)[/tex]
Given,
Volume (V) of zinc chloride = 0.250 L
Molarity of zinc chloride (M) = 0.360M
Moles of zinc chloride are calculated as:
[tex]\begin{aligned} \rm moles &= \rm molarity \times volume \\\\&= 0.360 \times 0.250\\\\&= 0.090 \;\rm mol\end{aligned}[/tex]
Moles of zinc hydroxide from zinc chloride are calculated as:
[tex]0.090\;\rm mol \; ZnCl_{2} \times \dfrac{ 1\;\rm mol \;\rm Zn(OH)_{2}}{1\;\rm mol\; ZnCl_{2}} = 0.090 \;\rm mol[/tex]
Mass is calculated as:
[tex]\begin{aligned} \rm mass &= \rm moles \times molar \; mass\\\\&= 0.090 \times 99.424 \\\\&= 8.95 \;\rm gm\end{aligned}[/tex]
Therefore, 8.95 gm precipitate is formed.
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After a metal object turns to dust (rust), it would have _____.
Need Help please
Answer:
The answer is high entropy.
Explanation:
Which process breaks down a compound into its elements?
Answer:
Chemical decomposition
Explanation:
Chemical decomposition, analysis or breakdown is the separation of a single chemical compound into its two or more elements or to simple compounds.
Answer:
Other processes that break down chemical substances into simpler substances, include depolymerization, decomposition, etc
Hope it helps!!!
Explanation:
Which of the following is a primary source for scientific information? O A. Doctoral theses OB. A handbook of scientific facts O C. Reviews of scientific studies D. Public opinion about a scientific issue
What is the Kc for the following reaction at equilibrium at 800∘C if [CO2]= 0.030 M ? CaCO3(s)⇌CaO(s)+CO2(g)
Answer:
0.030
Explanation:
Step 1: Write the balanced reaction at equilibrium
CaCO₃(s) ⇌ CaO(s) + CO₂(g)
Step 2: Calculate the concentration equilibrium constant
The concentration equilibrium constant (Kc) is equal to the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients. It doesn't include solids or pure liquids.
Kc = [CO₂] = 0.030
select two correct answers
Answer:
D and E
Explanation:
The other answers don't support steel, they support iron or are supporting both, and the question is why steel alloys are more often used
C supports both
B supports how iron's strength
A supports iron being easily shaped and bent
hope this helps
Question 6
Simplify the following expression
-3 + 4(a - 3b + 2) - 514 - a + 3b)
What happens in a synthesis reaction?
A. Two substances combine to form a single new substance.
B. One substance breaks down into two substances.
C. One substance separates into ions in solution.
D. Atoms in two substances rearrange to form new substances.
Answer: A) two substances combine to form a single new substance
Answer:Two substances combine to form a single new substance.
Explanation: just took it
What type of reproduction occurs in members of the bacteria kingdom?
Answer:
Bacteria can use sexual and asexual repoduction
Explanation:
To check the accuracy of a new method, a standard copper alloy containing 23.24% Cu was analyzed and calculated to contain 23.17%. calculate the relative error of the method in parts per thousand (ppt).
Answer:
3ppt is the relative error of the method
Explanation:
The relative error is a measurement used to determine the accuracy of your experiment, the equation to find the value in parts per thousand is:
Error = |True Value - Observed Value| / True Value * 1000
Where True value is 23.24%
And Observed value is 23.17%
Replacing:
Error = |23.24% - 23.17%| / 23.24% * 1000
Error =
3ppt is the relative error of the methodHow many liters is 3.3 moles of a gas?
Answer:
224.1
Explanation:
What is the phase label on HCl?
A. g
B. aq
C.
D. e
E. s
Answer:
B. aq if the reaction is inorganic (double or single displacement), neutralization, etc.
Explanation:
Hello there!
In this case, unfortunately we are not given the undergoing chemical reaction; however, in the most of the double displacement, neutralization, precipitation and in general, inorganic reactions, the hydrochloric acid must be B. aq as it must be dissolved in water as the reaction media. On the other hand, in some organic reactions, it can be either aqueous or gaseous, the latter, specially as a product. For that reason, you will need to make sure whether your reaction is organic or inorganic to correctly figure out the phase label.
Best regards!
Examination of the first few successive ionization energies for a given element usually reveals a large jump between two ionization energies. For example, the successive ionization energies of magnesium show a large jump between IE2 and IE3. The successive ionization energies of aluminum show a large jump between IE3 and IE4. Explain why these jumps occurs and how you might predict them.
Answer:
See Explanation
Explanation:
Ionization energy refers to the energy required to remove an electron from an atom. Metals have lower ionization energy than non metals since ionization energy increases across a period.
One thing that we must have in mind is that it takes much more energy to remove an electron from an inner filled shell than it takes to remove an electron from an outermost incompletely filled shell.
Now let us consider the case of magnesium which has two outermost electrons. Between IE2 and IE3 we have now moved to an inner filled shell(IE3 refers to removal of electrons from the inner second shell) and a lot of energy is required to remove an electron from this inner filled shell, hence the jump.
For aluminium having three outermost electrons, there is a jump between IE3 and IE4 because IE4 deals with electron removal from a second inner filled shell and a lot of energy is involved in the process hence the jump.
Hence a jump occurs each time electrons are removed from an inner filled shell.
A gas in a sealed container has a pressure of 125 atm at a temperature of 303 K. If the pressure in the container is increased to 200 atm, what is the new temperature if the volume remains constant?
(Show work pls :)!)
Answer:
485 K
Explanation:
Step 1: Given data
Initial pressure (P₁): 125 atmInitial temperature (T₁): 303 KFinal pressure (P₂): 200 atmFinal temperature (T₂): ?Step 2: Calculate the final temperature of the gas
Assuming constant volume and ideal behavior, we can calculate the final temperature of the gas using Gay Lussac's law.
P₁/T₁ = P₂/T₂
T₂ = P₂ × T₁/P₁
T₂ = 200 atm × 303 K/125 atm = 485 K
In many cases, a negatively charged compound (ex Cl-) will interact with a positively charged metal (ex Fe2 ). Usually we would consider this type of interaction to be ionic, but in the case of metals we do not. What type of bond is being formed when a ligand interacts with a metal and how could you know that the bond you are forming is that type of bond
Answer:
See Explanation
Explanation:
An ionic bond occurs due to electrostatic attraction between a positively charged ion and a negatively charged ion.
A metal and a ligand are bound by a coordinate covalent bond or a dative bond. This bond occurs due to donation of electron pairs from ligands to available orbitals on metals.
The formation of coordinate bonds is evident when neutral molecules or negative ions with non bonding electrons donate same to empty metal orbitals. This is sometimes shown by an arrow pointing from the ligands to the metal center.
For instance; tetraammine copper II ion is formed when four ammonia molecules donate a lone pair each to available vacant orbitals of the copper metal center to form [Cu(NH3)4]^2+.
What type of consumer eats only producers?
Answer: Primary consumers make up the second trophic level. They are also called herbivores. They eat primary producers—plants or algae—and nothing else. For example, a grasshopper living in the Everglades is a primary consumer
Answer:
primary consumer make up the second trophic level .they are also herbivores they eat primary consumer plants or alger and nothing else .for example a grasshopper living in the everglades is a primary consumer
why was the introduction of oxygen such a big deal?
Question 9
5 pts
Which energy transfer is correctly matched?
Fusion in the sun: chemical to light and heat
Lighting a match: heat energy into chemical energy
a cell phone: thermal to electrical
Turning on a ceiling fan: electrical to mechanical
Answer:
fusion in the sun
Explanation:
I know this because I am currently talking this test and I know it cause I did it
Answer:Turning on a ceiling fan: electrical to mechanical
I took the test and Fusion in the sun: chemical to light and heat Lighting a match: sound energy into chemical energy were the wrong answers.
Be sure to answer all parts. For an aqueous solution of sodium chloride (NaCl), determine the molarity of 4.05 L of a solution that contains 195 g of sodium chloride. M Determine the volume of this solution that would contain 4.63 moles of sodium chloride. L Determine the number of moles of sodium chloride in 25.35 L of this solution. mol
Answer:
[tex]0.824\ \text{M}[/tex]
[tex]5.62\ \text{L}[/tex]
[tex]20.89\ \text{mol}[/tex]
Explanation:
Molar mass of NaCl = 58.44 g/mol
Mass of NaCl = 195 g
Volume of solution = 4.05 L
Molarity of solution is
[tex]\dfrac{195}{4.05}\times \dfrac{1}{58.44}=0.824\ \text{M}[/tex]
The molarity of the solution is [tex]0.824\ \text{M}[/tex]
Moles of NaCl = 4.63 mol
Volume is given by
[tex]\dfrac{4.63}{0.824}=5.62\ \text{L}[/tex]
The volume of the solution that contains the required amount NaCl is [tex]5.62\ \text{L}[/tex]
Volume of solution = [tex]25.35\ \text{L}[/tex]
Moles of solution is given by
[tex]0.824\times 25.35=20.89\ \text{mol}[/tex]
The number of moles of NaCl is [tex]20.89\ \text{mol}[/tex].
Juan observes a material in the rocks of a hilluan hammers off a piece and then examines the pieces with a hana tena He
makes the following notes about what he observes
• has luster
• cubic crystals
• clear in color
What did he most likely observe through the hand lens?
A)
rock
B)
fossil
mineral
D)
animal bones
Answer:
I definitely think he mostly observed that it was clear in color.
Explanation:
1. Predict the missing product in the acid-base reaction.
HCL + NaOH
H2O +
HNa
CO2
Nach
О
CLOH
Answer: The missing product in the acid base reaction is NaCl.
Explanation:
Neutralization or acid base reaction is a chemical reaction in which acid and base combine to form salt and water. Acids donate [tex]H^+[/tex] ions and bases donate [tex]OH^-[/tex] ions in water which combine to form water molecules.
The balanced chemical reaction for the given reaction is ;
[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]
Thus the missing product is NaCl.
The missing product in the acid-base reaction is NaCl.
The balanced chemical reaction for the given reaction is ;
[tex]HCl +NaOH[/tex] → [tex]NaCl +H_20[/tex]
What is an acid-base reaction?When acid and base react with each other they form salt and water. Water and salt both are neutral which means, whenever acid and base react together, they are neutralized by each other.
Neutralization or acid base reaction is a chemical reaction in which acid and base combine to form salt and water.
Acids donate [tex]H^{+}[/tex] ions and bases donate [tex]0H^{-}[/tex] ions in water which combine to form water molecules.
Since acid and base neutralize each other's effect,it is called neutralization reaction.
For Example: When Sodium Hydroxide ( NaOH) , a base, reacts with Hydrochloric acid (HCl) , it forms the salt, Sodium Chloride (NaCl) and Water.
The balanced chemical reaction for the given reaction is ;
[tex]HCl +NaOH[/tex] → [tex]NaCl +H_20[/tex]
Thus the missing product in the acid-base reaction is NaCl.
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Ice at 0.0 degrees Celsius is combined with 50.0g of water at 75.0 degrees Celsius. Calculate the grams of ice present initially if the entire mixture comes to a final temperature of 25.00 degrees Celsius after the ice melts. Specific heat of water is 4.18 J/g degrees Celsius. SHOW WORK!
Answer:
m-Ice = 23.85g
Explanation:
The heat absorbed for the cold water (Heat of the increase of water + Heat of ice melting) is equal to the heat released for the water at 75°C. The equation is:
m-Ice-*C*ΔT + Hf*-m-Ice = m-water*C*ΔT
Where m-Ice- is our incognite
C is specific heat of water = 4.18J/g°C
ΔT is change in temperature = 25.0°C - 0.0°C = 25.0°C
Hf is enthalpy of fusion of water = 333.6J/g
m-water = 50.0g
ΔT is change in temperature = 75.0°C - 25.0°C = 50.0°C
m-Ice-*4.18J/g°C*25°C + 333.6J/g*-m-Ice = 50.0g*4.18J/g°C*50.0°C
104.5 m-Ice- + 333.6 m-Ice- = 10450
438.1 m-Ice = 10450
m-Ice = 23.85gHNO3 + NaOH → NaNO3 + H2O
Answer:
Explanation: what is the question?
This is a neutralisation reaction.
I take in oxgyen from the air and send it into your bloodstream. I also remove the carbon dioxide from your body. What system am I?
muscular system
respiratory system
digestive system
skeletal system please help
The change of energy from one form to another result in _____. Need help please
Answer:
The change of energy form one form to another result in chemical reaction!
2. A plant growing in response to the sunlight.
A.Gravitropism
B.Phototropism
C.Thigmotropism
D.Hydrotropism
Answer:
phototropism
Explanation:
since photo is (light?
Calculate the frequency of a light wave that has a wavelength of 9.2dm.
A(n) _________ is an atom or a group of atoms with either a positive or negative charge
O compound
O ion
O molecule
O nucleus
Answer:
the answer is ion..
hope it helps..
How many moles are in 454 Liters of a gas?
Answer:
20.27 mol
Explanation:
454 L x (1 mol/22.4 L) = 20.27 mol
What volume (in mL) of 0.3900 M HCl is required to neutralize 50.00 mL of 0.8000 M NaOH?
Answer:
102.6 mL
Explanation:
The reaction that takes place is:
NaOH + HCl → NaCl + H₂OFirst we calculate how many NaOH moles are there in 50.00 mL of a 0.8000 M solution:
0.8000 M * 50.00 mL = 40 mmol NaOHThen we convert NaOH moles into HCl moles:
40 mmol NaOH * [tex]\frac{1mmolHCl}{1mmolNaOH}[/tex] = 40 mmol HClFinally we calculate the volume of a 0.3900 M solution would contain 40 milimoles:
40 mmol / 0.3900 M = 102.6 mLIf 4.50 moles of C2H6 undergoes combustion, how many moles of oxygen would it combust with?
Answer:
First balance the equation
C2H6 + 7/2O2 2CO2 +3H2O
for one mole of C2H6 there are 7/2 mole of O2 required. so for4.50 moles you require 4.50 x 7/2 = 15.75 moles of O2.
Explanation: