Answer:
The correct answer is A :))
. Calculate the pH of a solution made by dissolving 1.87 g of sodium caproate, NaC6H11O2, Kb =
7.58 x 10-10, in water and diluting to a total volume of 500.0 mL.
Answer:
Hindi ko po alam pero subukan ko pong sagutan yan
You place a pot of soup on the stove. As the soup warms you notice some areas where soup is rising up and
other areas where soup is sinking down.
1. Why do you think some of the soup is rising up?
Answer:
Convention
Explanation:
Answer:
Because the soup became warm and less dense, so it rose up.
Explanation:
Found on Course Hero is an American education technology website company based in Redwood City, California, which operates an online learning platform for students to access course-specific study resources contributed by a community of students and educators.
What is true of the following chemical reaction?
Hg + O - Hgo
The mass of the individual reactants together is more than the mass of the
product.
The mass of the products is more than the mass of the reactants.
The mass of the products is equal to the mass of the reactants.
The mass of oxygen does not add to the equation because it is a gas.
Answer:
it is option c. the mass is equal of both
The law of conservation of mass is the concept used here to find out the true statement. The correct option is C - The mass of the products is equal to the mass of the reactants.
What is law of conservation of mass?The law which states that matter can neither be created nor destroyed in a chemical reaction is defined as the law of conservation of mass. This law was postulated by the scientist A. Lavoisier.
This law also states that the total mass of the products should be always equal to the total mass of the reactants. The reactants are the substances which are seen on the left part of the equation and the products are seen on the right part of the equation.
Here the mass of the compound Mercury (II) oxide is same as that of mercury and oxygen. Thus the given equation obeys the law of conservation of mass.
Thus the correct option is C.
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The photoelectric effect occurs when _____ are emitted from metal when the metal is struck by light of certain frequencies.
Answer:
electrons
Explanation:
The photoelectric effect occurs when electrons are emitted from metal when the metal is struck by light of certain frequencies.
Some of the applications of this effect include photomultipliers (which are a key component in spectroscopy instruments) and night vision devices.
Answer:
Electrons
Explanation:
Edge 2021
the law of conservation of mass
Answer: The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.
Explanation:
balanced or not balanced
2 H2 + 2 NO 2 H2O + N2
Answer: balanced
Explanation:
I need help with this!
Answer:
2.68 cm^3
Explanation:
Density= Mass/Volume
so...
8.96 g/cm^3 = 24.01 g/ V
and then u solve so it would be 2.68 cm ^3
((:
Baking soda and vinegar questions
The substance krypton has the following properties: normal melting point:
normal melting point: 115.9 K
normal boiling point: 119.8 K
triple point; 0.72 atm, 115.8 K
critical point: 54.3 atm, 209.4 K
A sample of krypton is initially at a pressure of 59.8 atm and a temperature of 107.7 K. The pressure on the sample is reduced to 0.720 atm at a constant temperature of 107.7 K. Which of the following are true?
a. The final state of the substance is a solid.
b. One or more phase changes will occur.
c. The final state of the substance is a liquid.
d. The sample is initially a gas.
e. The solid initially present will vaporize.
Answer:
Part 1
triple point; 0.72 atm, 115.8 K
Part 2
Option D, The sample is initially a gas.
Explanation:
Part 1
The triple point of krypton is 0.72 atm
and the melting point of Krypton is -157.4 °C or 115.8 K
Hence, option C is correct
Part 2
Option D
At 59.8 atm, Krypton is a gas. It changes its state from gas to liquid and solid when the temperature is extremely low. Here the temperature is same , hence only option D is correct
A student obtained 1.57 g of product in a chemical reaction in the lab although she expected to produce 2.04 g of product. What was the percent yield of the experiment?
A. 23.1%
B. 43.4%
C. 56.5%
D. 77.0%
Answer:
D. 77.0%
Explanation:
% yield = actual yield/theoretical yield x 100%
% yield = 1.57 g / 2.04 g x 100%
% yield = 76.96 (round up)
If you have 4.72 x 10^24 atoms of Carbon, how many moles of Carbon do you have?
Question 5 options:
2.84 x 10^48 moles of carbon
4.12 x 10^24 moles of carbon
4.72 x 10^24 moles of carbon
7.84 moles of carbon
Answer:
[tex]7.84\ \text{moles}[/tex]
Explanation:
Number of atoms of carbon = [tex]4.72\times 10^{24}[/tex]
Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]
Here we have to divide the number of atoms by the Avogadro's number
[tex]\dfrac{4.72\times 10^{24}}{6.022\times 10^{23}}=7.83792\approx 7.84\ \text{moles}[/tex]
The moles of carbon are [tex]7.84\ \text{moles}[/tex].
Naturally occurring silicon consists of three isotopes with the following isotopic masses and abundances. IsotopeIsotopic mass (u)Abundance (%) 28 Si 27.9769265327 92.2297 29 Si 28.97649472 4.6832 30 Si 29.97377022 3.0872 Calculate the average atomic mass of naturally occurring silicon to at least four significant figures.
Answer: The average atomic mass of naturally occurring silicon is 28.08
Explanation:
Mass of isotope Si-28 = 27.9769265327
% abundance of isotope Si-28 = 92.2297% = [tex]\frac{92.2297}{100}[/tex]
Mass of isotope Si-29 = 28.97649472
% abundance of isotope Si-29 = (4.6932)% = [tex]\frac{4.6832}{100}[/tex]
Mass of isotope Si-30 = 29.97377022
% abundance of isotope Si-30 = (3.0872)% = [tex]\frac{3.0872}{100}[/tex]
Formula used for average atomic mass of an element :
[tex]A=\sum[(27.9769265327\times \frac{92.2297}{100})+(28.97649472\times \frac{4.6832}{100})+(29.97377022\times \frac{3.0872}{100})][/tex]
[tex]A=28.08[/tex]
Therefore, the average atomic mass of naturally occurring silicon is 28.08
Consider the following chemical equilibrium:
N2 (g) + 3H2 ⇌ 2NH3
Now write an equation below that shows how to calculate Kp from Kc for this reaction at an absolute temperature .
Answer:
Kp = Kc (RT) ^(-2)
Explanation:
For the reaction;
N2 (g) + 3H2 ⇄ 2NH3(g)
We can write;
Kc = [NH3]^2/[N2] [H2]^3
But
Kp = pNH3^2/pN2 . PH2^3
To convert from Kc to Kp
Kp = Kc (RT) ^Δn
where Δn is the change in number of moles going from reactants
to products.
For this reaction;
Δn = 2- (3+1) = -2
Kp = Kc (RT) ^(-2)
How many molecules are in 85g of silver nitrate?
3.0 × 10²³ molecules AgNO₃
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableWriting CompoundsAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
85 g AgNO₃ (silver nitrate)
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of Ag - 107.87 g/mol
[PT] Molar Mass of N - 14.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of AgNO₃ - 107.87 + 14.01 + 3(16.00) = 169.88 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 85 \ g \ AgNO_3(\frac{1 \ mol \ AgNO_3}{169.88 \ g \ AgNO_3})(\frac{6.022 \cdot 10^{23} \ molecules \ AgNO_3}{1 \ mol \ AgNO_3})[/tex]Multiply/Divide: [tex]\displaystyle 3.01313 \cdot 10^{23} \ molecules \ AgNO_3[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.01313 × 10²³ molecules AgNO₃ ≈ 3.0 × 10²³ molecules AgNO₃
Plz someone answer my question..
Answer:
Z = 1 - a/VRT
Explanation:
Note :
Compressibility Factor, Z = PV / RT
Vander waal forces at Lower pressure is represented by the expression :
V[P + a/V²] = RT
Aim is to move PV /RT =Z to one side of the equation.
Using change of subject :
opening the bracket :
PV + aV / V² = RT
PV + a/V = RT
Divide through by RT
PV/RT + a/VRT = RT/RT
PV/RT + a/VRT = 1
Recall:
PV /RT = Z
equation becomes :
Z + a/VRT = 1
Subtract a/VRT from both sides
Z + a/VRT - a/VRT = 1 - a/VRT
Z = 1 - a/VRT
what is the percent composition of hydrogen in cane sugar
Answer:
6.48%
Explanation:
Consider four beakers labeled A, B, C, and D, each containing an aqueous solution and a solid piece of metal. Identity the beakers in which a chemical reaction will occur and those in which no reaction will occur. Mn(s) Ca(NO3)2(aq) KOH(aq) Fe(s) Pt(NO3)2(aq) Cu(s) Cr(s) H2SO4(aq)
Answer:
1. Mn(s) + Ca(NO₃)₂(aq) ----> No reaction
2. KOH(aq) + Fe(s) ----> No reaction
3. Pt(NO₃)₂(aq) + Cu(s) ----> Reaction occurs
4. Cr(s) + H₂SO₄(aq) ----> Reaction occurs
Explanation:
The activity series of metals is a series that arranges metals in order of reactivity from highest to lowest. It is used to determine which metal will displace another in a single displacement reactions, whereby a metal A, will replace or be replaced by another metal B in an aqueous solution depending on their relative positions in the activity series.
Considering the given reactions:
1. Mn(s) + Ca(NO₃)₂(aq)
2. KOH(aq) + Fe(s)
3. Pt(NO₃)₂(aq) + Cu(s)
4. Cr(s) + H₂SO₄(aq)
Reaction 1 will not occur because manganese, Mn, is lower than calcium, Ca, in the activity series of metals and cannot displace it from aqueous solutions.
Reaction 2 will not occur since iron, Fe, is lower than potassium, K, in the activity series and cannot displace it from aqueous solutions.
Reaction 3 will occur since platinum, Pt, is lower than copper, Cu, in the activity series and thus can be displaced by copper from aqueous solutions.
Reaction 4 will occur since chromium, Cr, is higher than hydrogen, H, in the activity series and thus, can displace it from aqueous solutions.
what is the answer to this?
Answer:
1. I
2.LOVE
3.YOU
JUST KIDDING
REAL ANSWER
Therefore, to get a neutral compound requires two Br and one Ca - ie, CaBr2.
hope it helps pleass give me a brainlliest answer love youu
How many grams of iron (III) oxide are needed to produce 86.0 g of iron metal?
Answer: 122.9 g
Explanation: Fe2O3 mw = 160 of which 112 is Fe
to get 86 g Fe, 86*160/112 g oxide
A compound has an empirical formula of PO2 and a molar mass of 126 g/mol. What
is the molecular formula of the molecule?
Answer:
P₂O₄
Explanation:
From the question given above, the following data were obtained:
Empirical formula = PO₂
Molar mass of compound = 126 g/mol
Molecular formula =.?
The molecular formula of the compound can be obtained as illustrated below:
Molecular formula = [Empirical]ₙ
= molar mass
[PO₂] × n = 126
[31 + (16× 2)] × n = 126
[31 + 32] × n = 126
63 × n = 126
Divide both side by 63
n = 126 / 63
n = 2
Molecular formula = [PO₂]ₙ
Molecular formula = [PO₂]₂
Molecular formula = P₂O₄
What amount of heat, in kJ, is required to vaporize 163.45 g of ethanol (C₂H₅OH)? (∆Hvap = 43.3 kJ/mol)
Answer:
Amount of heat required = 153.62 J
Explanation:
Given:
Mass = 163.45 g
∆Hvap = 43.3 kJ/mol
Molar mass C₂H₅OH = 46.07 g/mol
Find:
Amount of heat required
Computation:
Amount of heat required = Number of moles x Molar mass C₂H₅OH
Amount of heat required = [163.45/46.07][43.3]
Amount of heat required = 153.62 J
number of balance electrons of a non ionized oxygen atom
How many moles of Iron (Fe) can be produced form 20 moles of carbon
(C)?
2Fe2O3 + 3C —— 4Fe + 3C02
Moles of Fe produced = 40 moles
Further explanationGiven
Reaction
2Fe2O3 + 3C —— 4Fe + 3C02
20 moles of C
Required
moles of Fe
Solution
The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants and products)
From the reaction, mol ratio of Fe : C = 4 : 3, so mol Fe :
= 4/2 x mol C
= 4/2 x 20
= 40 moles
If expending 3500 kcal is equal to a loss of 1.0 lb, how many days will it take Charles to lose 5.0 lb? Express your answer to two significant figures. Charles consumes 1800 kcal per day.
Answer:31 days
Explanation:
3500kcal/lb x 5lb =17500
1800-1230=570
17500/570=30.70
Round up =31
This question involves the concepts of energy, weight, and time.
It will take Charles "9.7 days" to lose 5.0 lb.
TIME TO LOSE WEIGHTSince the loss of 1.0 lb weight requires expending 3500 kcal energy. Therefore, by using the unitary method,
1.0 lb loss = 3500 kcal
(5)(1.0) lb loss = (5)(3500 kcal)
5.0 lb loss = 17500 kcal ----- eqn(1)
Now, the time required to consume 1800 kcal is 1 day. Hence, by the unitary method,
1800 kcal = 1 day
1 kcal = [tex]\frac{1}{1800}\ day[/tex]
17500 kcal = [tex]\frac{17500}{1800}[/tex] day
17500 kcal = 9.7 days ------ eqn(2)
Comparing eqn (1) and eqn (2)
5.0 lb loss = 9.7 days
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this is an example of what process ?
The distance between the centers of the two oxygen atoms in an oxygen molecule is 1.21 x 10-8 cm. What is this distance in inches?
Answer:
[tex]d=4.75\times 10^{-9}\ \text{inches}[/tex]
Explanation:
Given that,
The distance between the centers of the two oxygen atoms in an oxygen molecule is [tex]1.21\times 10^{-8}\ cm[/tex].
We need to convert this distance in inches.
We know that,
1 cm = 0.393 inches
We can solve it as follows :
[tex]1.21\times 10^{-8}\ cm=0.393\times 1.21\times 10^{-8}\\\\=4.75\times 10^{-9}\ \text{inches}[/tex]
So, the distance between the centers of the two oxygen atoms is [tex]4.75\times 10^{-9}\ \text{inches}[/tex].
Applying a force can make an electron shift from one atom to another causing what?
can someone help me with this?
Answer:
The growth of any plant is controlled by many factor and it depends on them.
Explanation:
The words are sorted according to their genetic factors and the environment factors by the category on which they effect and impact the growth of a plant.
Genetic factor :
Waxy leaves, bad tasting leaves, disease, leaf structure, types of stem, plant structure, reproduction, types of roots.
Environment factor : sunlight, drought, fire, flood, heat wave, insects, wind, space, pH of soil, temperature, pollution, terrain, soil conditions, lack of air.
Molecular formula of a compound with an empirical formula c5h6 and a molar mass of 132.21
Answer:C10H12
Explanation:
Given :empirical formula =C5H6
molar mass of carbon =12 g /mole approximately
molar mass of hydrogen =1.01g/mole approximately
molar mass of C5H6=(5*12)+(6*1.01)=66.06 g/moles
132.21/66.06=2 approximately
therefore ,the answer is C10H12
I HOPE IT HELPS !!
Correct formula for aluminum oxide
Answer:
Formula for aluminum oxide Al₂O₃
Explanation:
Hope that helps
Answer:
Al2O3, ionic
Explanation: