Answer:
2 moles
Explanation:
How many molecules of H2O are equivalent to 98.2 g of H2O
Answer:
Demo Mole Quantities
58.5g NaCl(mol/58.5g)(6.02 x 1023/mol) = 6.02 x 1023 Na
+
Cl21 pre-1982 pennies (after 1982 pennies are mostly zinc with copper coating)
63.5g Cu( mol/ 63.5g)(6.02 x 1023/mol) = 6.02 x 1023 Cu
19.0g Al (mol/27.0g)(6.02 x 1023/mol) = 4.24 x 1023 Al
Explanation:
A sample of gas occupies 200 L at 780 mm Hg and 280 K. What is the new volume, in liters, of the gas at 810 mm Hg and 300 K?
Given :
A sample of gas occupies 200 L at 780 mm Hg and 280 K.
To Find :
The new volume, in liters, of the gas at 810 mm Hg and 300 K.
Solution :
We know, by ideal gas equation :
[tex]PV = nRT[/tex]
Since, every thing is constant except [tex]nR[/tex] .
So,
[tex]\dfrac{P_1V_1}{T_1} = \dfrac{P_2V_2}{T_2}[/tex]
Putting all given values we get :
[tex]V_2 = \dfrac{T_2}{T_1}\times \dfrac{P_1}{P_2}\times V_1\\\\V_2 = \dfrac{300}{280}\times \dfrac{780}{810}\times 200\ L\\\\V_2 = 206.35 \ L[/tex]
Therefore, the new volume is 206.35 L.
Within an ecosystem,there are levels of organization. Which levels are missing from the diagram below?
Answer:
the missing levels are "population, community"
Two clear solutions are placed in separate beakers. The first solution has a pH = 4, and the pH of the second solution is unknown.
If the two solutions are mixed and the resulting solution has a pH = 7, describe the second solution.
A) The second solution has a higher pH level than the first solution. It has a
pH that is weaker but still neutralized the first solution. It also has a higher
concentration of hydronium ions compared to the first solution.
B) The pH of the second solution is higher than the pH of the first solution. It
is also acidic and, therefore, has a higher concentration of hydroxide ions
compared to the first solution.
C) The second solution has a basic pH level. It was strong enough to
neutralize the first solution. It also has a higher concentration of hydroxide
ions compared to the first solution.
D) The second solution has and equivalent number of hydroxide and
hydronium ions. It has a pH level that is higher (stronger) than the first
solution.
Answer:
C.
Explanation:
When the pH is 7 there is equal amount of H+ and OH so the solution added must be strong enough to nuetralize the acid. So option A is out B is wrong because adding a acidic solution to an acidic solution wont nuetralize it, D is wrong because if the 2 solution was already equal in both it would essentaly be water. ALthough water would raise the pH it would not nuetralize it to a even 7.
Use Target Reading Skills After you read the section, reread the paragraphs that contain definitions of Key Terms. Use all of the information you have learned to write a meaningful sentence using each Key Term. a. chemical equation:
Cells grouped together to make a specific part of the body of a plant or animal are called:
A. an organism
B. photosynthesis
C. a tissue
Q1. Describe the term "Displacement reaction"
Determine the number of atoms or molecules in 0.30 mol F
Answer:
4.214 x10 23 atoms
Explanation:
.7 x (6.02x 10 23)
for every mol there is
6.02 e 23 atoms so if you multiply both you get the atoms
Select the correct answer. Which is true according to the law of conservation of energy? A. In a closed system, the total amount of energy in the universe keeps on changing. B. The supply of energy is limited, so it is essential to conserve it. C. In a closed system, energy can be created and destroyed. D. In a closed system, energy cannot be used faster than it is created. E. In a closed system, the total energy always remains constant.
in the image there is answer okk
Pls help due tommorow
Answer:
.
Explanation:
a. 2, 2
b. 2, 2
c. 2, 3, 2
d. 1, 5, 3, 4
Just make sure there is an equal amount of each ELEMENT on each side of the reaction. Starting with, O, H, C, then other elements is a good method too
Which of the following microorganisms is most likely to get its main source of nutrition from a host?
Bacteria
Parasite
T-cell
Virus
Answer:
A Parasite.
Explanation:
Viruses and bacteria can survive in most areas without a host. Parasites however need a host to survive. Some parasites include: tapeworm, roundworms, flukes, and protozoa.
What is higher boiling point alkyne or alkyl halides??
Answer: alkyl halide
Explanation: brianlist please?
Plz help
.
S
S
S
S
Z
.
-33⁰C
Explanation:
Charles Law states V/T initial = V/T final
T must be in Kelvin.
100/300 = 80/x
(27⁰C + 273 = 300
100x = (300)(80)
100x = 24,000
x = 240⁰K
240 - 273 = -33⁰C
A molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor.
a. True
b. False
Answer: The statement 'a molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor' is true.
Explanation:
A molecule or ion that donates hydrogen in a hydrogen bond is called a hydrogen donor.
For example, [tex]NH_{3} + H_{2}O \rightarrow NH^{+}_{4} + OH^{-}[/tex]
Here, [tex]NH_{3}[/tex] is donating the hydrogen ion to water molecule. Whereas water is accepting the hydrogen ion so water is a hydrogen bond acceptor. Therefore, hydrogen bond is formed by [tex]NH_{3}[/tex].
Thus, we can conclude that the statement 'a molecule or ion that donates the hydrogen in a hydrogen bond is a hydrogen bond donor' is true.
Today we are going to perform a titration. What is an acid-alkali titration?
a) A measurement apparatus
b) An analytic method
c) A chemical reaction
LABSTER
Answer:
A chemical reaction
Explanation:
You're doing acid-alkali. Acid is like a ph.
Titration is a method used to prepare salts if the reactants are soluble. Concentration and volumes of reactants can be calculated from titrations. The concentration of an acid or alkali can be calculated by carrying out an experiment called a titration.
We have that for the Question "Today we are going to perform a titration. What is an acid-alkali titration?" it can be said that
From the question we are told
Today we are going to perform a titration. What is an acid-alkali titration?
a) A measurement apparatus
b) An analytic method
c) A chemical reaction
Generally
acid-alkali titration is a popular chemical reaction that is used to obtain salts and this method is also used to determine many other variables of the reactants
Therefore
An acid-alkali titration is a
chemical reaction
For more information on this visit
https://brainly.com/question/19007362
What would the Kc value be from this reaction: H2 + I2 = 2HI.
(Because of the coefficient "2" in front of HI, you will have to square the concentration
of HI to find Kc. Kc = ?
Answer: The value of [tex]K_{c}[/tex] for the given reaction is [tex]K_{c} = \frac{[HI]^{2}}{[H_{2}][I_{2}]}[/tex] .
Explanation:
The ratio of concentration of products and reactants raised to the power of their concentration is called equilibrium constant.
It is denoted by the symbol [tex]'K_{c}'[/tex].
For example, [tex]H_{2} + I_{2} \rightarrow 2HI[/tex]
The expression for [tex]K_{c}[/tex] of this reaction is as follows.
[tex]K_{c} = \frac{[HI]^{2}}{[H_{2}][I_{2}]}[/tex]
So, by putting the respective concentrations of the species involved in the reaction it is possible to determine the value of [tex]K_{c}[/tex] for the given reaction.
Thus, we can conclude that the value of [tex]K_{c}[/tex] for the given reaction is [tex]K_{c} = \frac{[HI]^{2}}{[H_{2}][I_{2}]}[/tex] .
Help!!!
1.
Q: How does the distillation apparatus remove impurities from water?
Q: Why does water vapour condense in the condenser tube?
Q: As the boiling animation neared the end, what does the change in the proportion of particle types in the boiling flask indicate about the impurities?
Answer:
Q1) Distillation relies on evaporation to purify water
Explanation:
contaminated water is heated to form steam. inorganic compounds and large non-volatile organic molecules do not evaporate with the water and are left behind. The steam then cools and condenses to form purified water
What are greenhouse gases?
We learned that Energy can
exist in many forms.
Do you think energy can
converted from one form to
another?
what is the molar mass of barium hydroxide
Answer:
171.34 g/mol
Explanation:
Ba molar mass = 137.328 g/mol
O molar mass = 15.999 g/mol * 2 = 31.9980 g/mol
H molar mass = 1.008 g/mol * 2 = 2.0160 g/mol
137.328 + 31.9980 + 2.0160 = 171.3420 = 171.34 g/mol
In today's experiment, Solutions A and B are prepared as follows.
Solution A: Solution B:
2.0 mL of 3.00 x 10-4 M bromcresol green 2.0 mL of 3.00 x 10-4 M bromcresol green
5.0 mL of 1.60 M acetic acid (HAc) 2.0 mL of 0.160 M sodium acetate (NaAc)
2.0 mL of 0.200 M KCl diluted to a total volume of 50 mL
diluted to a total volume of 50 mL
What is the molarity of HAc in Solution A?
A. 6.4x 10-3
B. 3.20 x 10-4
C. 8.0 x 10-3
D. 0.160
E. 1.60
Answer:
D. 0.160
Explanation:
The solution A is obtained adding 2.0mL of a solution of bromocresol green, 5.0mL of 1.60M HAc and 2.0mL of a solution of KCl. The solution is diluted to 50mL
That means the HAc is diluted from 5.0mL to 50.0mL, that is:
50.0mL / 5.0mL = 10 times.
And the final concentration of HAc must be:
1.60M / 10 times =
0.160M
Right answer is:
D. 0.160Which of the following is the balanced equation
for the decomposition of hydrogen peroxide
(H2O2) into water and oxygen gas?
A H2O2 - 2H + 20
В. НО
H202 -- H2O + O2
a
2H202
H2O + 202
D 2H202 - 2H2O + O2
Answer:
D
Explanation:
2H202 = 2H2O + O2
Help I need to finish this in 10 minutes!
Answer:
this is a animal cell..I hope you received this on time
Match each phylum with the correct description
cnidarians
internal skeletons made of hardened plates
echinoderms
radial symmetry and stinging cells
arthropods
jointed body parts and an external skeleton
annelids
segmented body and closed circulatory
system
Answer:
:) Here
Explanation:
How many grams of KCl, are soluble in 100 g of water at 60 ºC?
a)15g
b)35g
c)45g
d)90g
45 g
the solubility of KCl in water at 60 degree c is 45.5g per 100g of water
The explosion of a bomb and the toxicity of a deadly poison are both chemical reactions.
•True
•False
Answer:
True
Explanation:
both are chemical, got it right on my test
Which term is a measurement of heat?
A. Hot
B. Warm
C. Cold
D. Temperature
Answer:
A? or maybe C?
Explanation:
Hot is heat... right? so is warm.. Am i missing something?
Answer:
The answer is D
Explanation:
I got it correct on the quiz.
structure of potassium trioxalatoaluminate(iii)?
Answer:
K3[Al(C2O4)3] is the answer
The name of an alcohol side chain is known as an alkoxy group. True or false?
How many grams of CO are needed to produce 209.7 g Fe?
Fe2O3+3CO⟶3CO2+2Fe
Answer:
157.8 g
Explanation:
Step 1: Write the balanced equation
Fe₂O₃ + 3 CO ⟶ 3 CO₂ + 2 Fe
Step 2: Calculate the moles corresponding to 209.7 g of Fe
The molar mass of Fe is 55.85 g/mol
209.7 g × 1 mol/55.85 g = 3.755 mol
Step 3: Calculate the moles of CO needed to produce 3.755 moles of Fe
The molar ratio of CO to Fe is 3:2. The moles of CO needed are 3/2 × 3.755 = 5.633 mol
Step 4: Calculate the mass corresponding to 5.633 moles of CO
The molar mass of CO is 28.01 g/mol.
5.633 mol × 28.01 g/mol = 157.8 g