Answer:
0.0922 M
Explanation:
The problem first states that the titration is made using NaOH, and later asks about the addition of KOH. I'm going to assume NaOH was used throughout the whole problem. The result does not change if it was KOH instead.
The reaction that takes place is:
HClO₄ + NaOH → NaClO₄ + H₂OFirst we calculate how many HClO₄ moles are there in the sample, using the given molarity and volume:
0.624 M * 13.0 mL = 8.11 mmol HClO₄Then we calculate how many NaOH moles were added:
0.258 M * 15.0 mL = 3.87 mmol NaOHNow we calculate how many HClO₄ remained after the reaction:
8.11 - 3.87 = 4.24 mmol HClO₄As HClO₄ is a strong acid, 4.24 mmol HClO₄ = 4.24 mmol H⁺
Finally we calculate the molarity of H⁺, using the calculated number of moles and final volume:
Final volume = 31.0 mL + 15.0 mL = 46.0 mL4.24 mmol / 46.0 mL = 0.0922 MA company claims that its weight-loss product is the safest. Why might this
be a biased claim?
A. The company is trying to get you to buy its product.
B. The company has lots of scientific information about the product
C. The company is very successful.
D. The company has studied the product more than anyone.
The melting of ice is considered a/an _______ because the ice absorbs heat from the surroundings.
Question 3 options:
A)
chemical reaction
B)
thermochemical process
C)
exothermic process
D)
endothermic process
Answer:
the correct answer is D
Explanation:
Basically, melting ice is an endothermic reaction because the ice absorbs (heat) energy, which causes a change to occur.
Please give me the answer please
Answer:
A. 30cm³
Explanation:
Based on the chemical reaction:
CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂
1 mol of calcium carbonate reacts with 2 moles of HCl to produce 1 mol of CO₂
To solve this question we must convert the mass of each reactant to moles. With the moles we can find limiting reactant and the moles of CO₂ produced. Using PV = nRT we can find the volume of the gas:
Moles CaCO₃ -Molar mass: 100.09g/mol-
1.00g * (1mol / 100.09g) = 9.991x10⁻³ moles
Moles HCl:
50cm³ = 0.0500dm³ * (0.05 mol / dm³) = 2.5x10⁻³ moles
For a complete reaction of 2.5x10⁻³ moles HCl there are necessaries:
2.5x10⁻³ moles HCl * (1mol CaCO₃ / 2mol HCl) = 1.25x10⁻³ moles CaCO₃. As there are 9.991x10⁻³ moles, HCl is limiting reactant.
The moles produced of CO₂ are:
2.5x10⁻³ moles HCl * (1mol CO₂ / 2mol HCl) = 1.25x10⁻³ moles CO₂
Using PV = nRT
Where P is pressure = 1atm assuming STP
V volume in L
n moles = 1.25x10⁻³ moles CO₂
R gas constant = 0.082atmL/molK
T = 273.15K at STP
V = nRT / P
1.25x10⁻³ moles * 0.082atmL/molK*273.15K / 1atm = V
0.028L = V
28cm³ = V
As 28cm³ ≈ 30cm³
Right option is:
A. 30cm³
A scientist has two substances that she is testing in her lab: a pink
substance and a green substance. At room temperature, both substances
are liquids. The scientist transferred the same amount of energy into both
substances. She finds only the pink substance changed phase. How is the
pink substance different from the green substance? The pink substance
has a ...*
weaker attraction between its molecules than the green substance. Its molecules now
move away from each other.
weaker attraction between its molecules than the green substance. Its molecules now
move in place.
stronger attraction between its Molecules than the green substance. Its molecules
now move away from each other.
stronger attraction between its molecules than the green substance. Its molecules
move around each other.
Answer:
Weaker attraction between its molecules than the green substance. It's molecules now move away from each other.
Explanation:
Liquid to gas.
The pink substance should be weaker attraction between its molecules than the green substance. It's molecules now move away from each other.
The following information should be considered:
The pink substance considered to the weaker attraction that lies between the molecules as compared to the green substance. It is move away from each other, Also it is liquid to gas.Learn more: brainly.com/question/17429689
charles law . who can please help me with these two problems asap ?
Answer:
k
Explanation:
Many scientists think human cloning is possible, so why haven't we made human clones yet?
Question 5 options:
There is not enough medical supplies to clone a human
Human cloning is extremely controversial and many people believe it is unethical
Scientists have determined that stem cells would not be beneficial to human cloning
The human genome is too complex to clone
Answer:
GIVEN IT'S A MULTI CHOICE QUESTION:
1. False
2. True
3. False
4. True
IF ITS NOT
2
Explanation:
We haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.
What is cloning?Cloning is a genetic technique that can be used to reproduce genetically identical organisms in a laboratory.
Human cloning refers to the generation of genetically identical humans in the laboratory.Human cloning can be considered unethical because a person has the right to have an identity, and the cloning technique faces this principle.In conclusion, we haven't made human clones because human cloning is extremely controversial and many people believe it is unethical.
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PLEASE HELP ME YOU DONT HAVE TO DO WORK JUST TELL ME IF ITS RIGHT ON THE ORGANIC AND INORGANIC SIDE PLEASEE
Answer:
Its right you dont have to change anything
8.8 Why do esters with higher molecular mass not have strong fragrances?
Answer:
Basically, fragrances reach other person through sense of smell. So, the strength of the fragrances depends a lot on its evaporation, which is strongly related to the boiling point. Esters with higher molecular weight do not have a strong fragrance because it has a higher boiling point.
Which example is a mixture? alcohol water mercury orange soda
Answer:
water is an example of mixture
2C10H22 + 3102
20CO2 + 22H2O
What mass of O2 is needed to react completely with 7.5 grams of C10H22?
Answer:
2c11h21
Explanation:
Which has greater heat capacity—iron, tin, or bismuth? Why do you say this?
Answer:
Bismuth, because when three cubes of the same mass were heated and dropped into the same temperature water, the water the bismuth cube was dropped in heated up much less than the water with iron or tin.
REWRITE THIS IN YOUR OWN WORDS PLEASE, THANK YOU.
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The greatest heat capacity is possessed by iron.
The heat capacity of materials increases as the number of particles in the material or density of the material increases.
This means that the denser a material is, the higher its heat capacity because it has more particles that absorbs heat.
The heat capacity is the quantity of heat required to raise the temperature of 1 gram of a material by 1°C.
The heat capacities of iron, tin and bismuth are: 0.45 J/g °C, 0.213 J/g °C and 0.123 J/g °C.
This follows from the decreasing densities of the metals in the order; iron > tin > bismuth.
Hence iron has the greatest heat capacity among the three elements.
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what is the formal charge in SeCl4?
PLEASE HELP WILL MARK BRAINLEST!!!
Answer:
I think its 3.6 to the right
Explanation:
I apologize if im wrong
Which soil horizon contains the most organic matter?
A horizon
B horizon
C horizon
D horizon
Answer:
I- It says horizon so.....what....wth ._.
Explanation:
PLEASE HELP ME ON THIS QUESTION
Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. half-reaction identification Sn2 (aq) 2e-Sn(s) reduction Al(s)Al3 (aq) 3e- oxidation (2) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients.
Answer: Oxidation reaction: [tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]
Reduction reaction: [tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex]
Overall redox reaction : [tex]2Al(s)+3Sn^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Sn(s)[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
[tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex]
Overall redox reaction : [tex]2Al(s)+3Sn^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Sn(s)[/tex]
Can somebody please help me please!!
3 attempts left
Check my work
Enter your answer in the provided box.
A volume of 1.0 L of air at 37°C is expelled from the lungs into cold surroundings at 5.6°C.
What volume in L) does the expelled air occupy at this temperature. The pressure and the number of
gas particles do not change.
L
Answer:
If kept in Celsius: 0.15 L
If kept in Kelvin: 0.89 L = 0.90 L
Explanation:
This formula can be remembered by just remembering the ideal gas law formula, PV=nRT
P= pressure, V= volume, n= moles, R=constant, and T= temperature.
Let's take away what is constant, particles/moles, pressure, and R.
so what we have is P=T -> [tex]\frac{V}{T}[/tex] =x, we want to know how it changes though so we can say that [tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]. Where P1 and T1 are for the air in your lungs that you expel, the P2 and T2 is the air now in your surroundings after you exhale.
Let's plug it in and solve for V2.
[tex]\frac{1 L}{37 C} = \frac{V2}{5.6}[/tex]
[tex]\frac{(1 L x 5.6 C)}{37 C} =[/tex] V2
0.15 L = V2
Consider the balanced chemical equation
4B(s) + 302 (g)► 2B203(s)
What mole ratio would you use to calculate how many moles of oxygen gas would be needed to react completely with a given number of moles of boron?
A. 3 mol O2
/ 4 mol B
B. 4 mol O2/
3 mol B
C. 3 mol O2/
2 mol B
D.
2 mol O2
/ 3 mol B
Answer:
A
Explanation:
The coefficents are used when determining mole ratio. So just look in front of O and B
the ratio is 3/4
you cna use this in stoich as well
Can you list some examples for each of the three domains of bacteria, archaea, and eukarya?
Answer: bacteria: e Coli
Explanation:
The bacteria and archaea are microorganisms. Escheria coli, staphylococcus aureus etc are examples of bacteria. Different types of archaea includes bathyarchaeota, thermoproteota etc. Eukaryotes are multicellular organisms such as plants, fungi, animals etc.
What are eukaryotes?Eukaryotes are multicellular organisms with developed cellular organization and developed nucleus. All the higher level organisms such as humans, animals, fungi, plants etc are eukaryotes.
Microorganisms such bacteria are single celled organisms and they are called unicellular having only one cell without a developed nucleus.There are many types of bacteria based on their structure and functions such as spirulina, staphylococcus, vibrio coli etc.
Archaea is another type of unicellular organism which first classified as type of bacteria, but later they are included in a new class of domain. They are natural methanogens that is they produce methane gas. Some examples are bathyarchaeota, thermoproteota etc.
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A substance has a percent composition of 17.55% Sodium, 39.70%
Chromium, and 42.75% Oxygen. What is the empirical formula of the
substance? *
Need help anyone plz :)
Cr2Na2O7
Sodium Dichromate
Which of the following apply to gases. Select all that apply.
Answer:
kindly give options
Explanation:
Who first proposed the concept of free energy?
a. Gibbs
b. Lavoisier
c. Dalton
d. Hess
Answer:
Hello There!!
Explanation:
The answer is=>a. Gibbs.
hope this helps,have a great day!!
~Pinky~
[tex]\huge{\textbf{\textsf{{\color{navy}{An}}{\purple{sw}}{\pink{er}} {\color{pink}{:}}}}}[/tex]
a. Gibbs
ThanksHELP ME PLSSSSSSSSSSSSAA
Answer:
If capital R is round, than the RR and Rr will mean round, and the two rr's are wrinkled. that means the answer to both is 50%
Explanation:
hope that helps
How many more atoms does carbonic acid have than water ?
Answer:
I believe the answer is 3. Carbonic acid has 3 more atoms than water.
Explanation:
Because water has 3 atoms and I think Carbonic acid has 6 so 6-3=3.
What would a curve with the shape of an isoceles triangle indicate?
1. Caffeine has a distribution coefficient of 8.4 for methylene chloride (CH2Cl2)/water (H2O). How much caffeine will be extracted from a 60 mL cup of Turkish coffee (100 mg caffeine) by 40 mL of methylene chloride (CH2Cl2)
Answer:
91.224 mg of caffeine will be extracted from a 60 mL cup of Turkish coffee (100 mg caffeine) by 40 mL of methylene chloride (CH2Cl2)
Explanation:
The distribution co-efficient of Caffeine for methylene chloride (CH2Cl2)/water (H2O) is 8.4
Volume of Turkish coffee = 60 mL
Volume of methylene chloride (CH2Cl2) = 40 ml
Distribution coefficient is represented by K
[tex]8.4 = \frac{\frac{X}{60}}{\frac{100-X}{50} } \\X = 91.224[/tex] mg
a 61601609060
in word
Hydrochloric acid reacts with sodium hydroxide to produce sodium chloride and water. If 20.6 g of sodium hydroxide reacts with an excess of hydrochloric acid, how many grams of sodium chloride are produced? HCl + NaOH → NaCl + H2O
Answer:
30.1 g NaCl
Explanation:
Your first conversion is converting grams NaOH to moles of NaOH using its molar mass (39.997 g/mol). Then, use the mole ratio of 1 mol NaCl for every 1 mol NaOH to get to moles of NaCl. Then finally multiply by the molar mass of NaCl (58.44 g/mol) to get grams of NaCl.
20.6 g NaOH • (1 mol NaOH / 39.997 g NaOH) • (1 mol NaCl / 1 mol NaOH) • (58.44 g NaCl / 1 mol NaCl) = 30.1 g NaCl
Write the chemical equation for the dissolution of NH4Cl in water including the
Heat term
