Answer:
Mass of water == 1.71 g
Explanation:
Given data:
Initial temperature of water = 10°C
Final temperature of water = 50°C
Energy absorbed = 286 J
Mass of water = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Specific heat capacity of water is 4.18 J/g.°C
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 50°C - 10°C
ΔT = 40°C
by putting values,
286 J = m × 4.18 J/g.°C × 40°C
286 J = m × 167.2 J/g
m = 286 J / 167.2 J/g
m = 1.71 g
(05 06 MC) The theoretical yields of Cl2 from certain starting amounts of MnO2 and HCl were calculated as 65.36 g and 68.08 g, respectively.
If the percentage yield of Cl2 is 70%, what is its actual yield?
42.25g
45.65g
46.33g
47.66g
Actual yield : 45.752 g ⇒no option
Further explanationGiven
The theoretical yields of Cl₂ : 65.35 g and 68.08 g
Required
The actual yield
Solution
Reaction
4 HCl (aq) + MnO₂ (s) → MnCl₂ (aq) + Cl₂ (g) + 2H₂O (l)
Because there are two theoretical yields, then we can choose the smallest one because the value is usually determined from the limiting reactant (in this reaction the limiting reactant is MnO₂)
So 65.36 g is The theoretical yields of Cl₂
Then the actual yield :
[tex]\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\actual=\%yield\times theoretical\\\\actual=70\%\times 65.36=45.752[/tex]
What's the molar mass of Cr(Cr2O7)3
700 g/mol
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 TableExplanation:Step 1: Define
Cr(Cr₂O₇)₃
Step 2: Identify
Molar Mass of Cr - 52.00 g/mol
Molar Mass of O - 16.00 g/mol
Step 3: Find MM
Molar Mass of Cr(Cr₂O₇)₃ - 52.00 + 6(52.00) + 21(16.00) = 700 g/mol
Which change will decrease the electric force between two positively charged objects? moving them closer together moving them farther apart adding neutrons removing electrons
Answer:
Moving them farther apart
Explanation:
One can try to change the distance between the two positive charges in such a way that it increases the distance and decreased the electric force.
Answer:
moving them farther apart
Explanation:
aka B.
Suppose you were writing a summary of the article. Which of these will be most important to put in the summary?
Red light has a wavelength of 700 nm and a frequency of 4.3 x 10^14 s^-1. What is the energy of a single photon of red light?
A. 2.85 x 10^-20
B. 2.85 x 10^19
C. 2.85 x 10^-34
D. 2.85 x 10^-19
Answer:
E = 2.85×10⁻¹⁹ J
Explanation:
Given data:
Wavelength of light = 700 nm
Frequency of light = 4.3×10¹⁴ s⁻¹
What is the energy of light = ?
Solution:
Formula:
E = h × f
h = plancks constant = 6.63×10⁻³⁴ Js
by putting values,
E = 6.63×10⁻³⁴ Js × 4.3×10¹⁴ s⁻¹
E = 28.5×10⁻²⁰ J
E = 2.85×10⁻¹⁹ J
What is the electron configuration of chlorine (CI)?
O 1s?2s?2p°3s?3p³
O 1s2s?2p3s?3p5
O 1s2s22p3s?4s?3p3
O 1s?2s?2p3s?3p²3d
Hello! :)
[tex]\large\boxed{1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}}[/tex]
Chlorine is a halogen located in group 7A and period 3 of the periodic table.
We can write the electron configuration of this element. Since it is in period 3, the highest configuration level will be at 3.
Chlorine is also located in the p block (nonmetal) section of the table, so the final part of the written configuration will involve "3p".
Recall that:
S block: up to 2 electrons
P block: up to 6 electrons
Chlorine has 17 electrons
Fill in the order of s block to p block. The first level only goes up to an s block. The configuration should sum up to 17 total electrons in total.
We can write the configuration as:
[tex]1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}[/tex]
Would a tighter or a looser cover heat the oven faster? How about no covering at all?
Geologists apply various methods to study the layers of the earth. Which if the following is a method used to study the deaths layers
Answer: ???
Explanation:???
What type of thermal energy transfer best describes how the surface of the earth is?
Answer:
Convection
Explanation:
Convection is a form of thermal energy that rotates like, hot air goes up and cool air goes down. This happens in the squishy part of the Earth surface, that's why ppl say the more you dig the hotter it gets :)
Explain the formation of an ionic compound between a metal and a non- metal by transfer of electrons with Mg as the metal and chlorine as the non metal to illustrate your answer. Give the reaction that occurs.
Answer: MgCl2
Explanation:
There will be two Chlorine atoms, and one Magnesium atom. The Mg atom will transfer one valence electron to each Chlorine atom to make them stable. I don't know the reaction that happens, I'm Sorryy. But yeah... have a nice day! :)
Which of the following statements
is/are true about the region of the
atom labeled "x" in the attached
picture?
Explanation:
The region x of the atom shown is called the nucleus of the atom shown. The nucleus of an atom contains protons and neutrons.
Protons are the positively charged particles found in the nucleusNeutrons do not carry any charges. Together protons and neutrons determines the mass of the atom. The mass of an atom is concentrated in the nucleusBoth particles have equal massesThe region y is the atomic orbital where electrons can be found.
SHOW WORK
How many drops are in a 2-L bottle of Pepsi?
Answer:
The number of drops depends upon the size of the drops. So, basically, 1 ml has a drops of 20
so 2000 mo will have a 40k drops
calculate the mass of one atom of helium.
Answer:
One atom lf helium has a mass of 4 u
Know that 1 u =1.66. 10-24g
How many grams are in 1.76 x 10^23 atoms of iodine
Answer:
[tex]\boxed {\boxed {\sf About \ 37.1 \ grams \ of \ iodine }}[/tex]
Explanation:
To convert from atoms to grams, you must first convert atoms to moles, then moles to grams.
1. Convert Atoms to Moles
To convert atoms to grams, Avogadro's number must be used.
[tex]6.022*10^{23}[/tex]
This number tells us the number of particles (atoms, molecules, ions, etc.) in 1 mole. In this case, the particles are atoms of iodine.
[tex]\frac{6.022*10^{23} \ atoms \ I }{1 \ mol \ I}[/tex]
Multiply the given number of atoms by Avogadro's number.
[tex]1.76*10^{23} \ atoms \ I*\frac{6.022*10^{23} \ atoms \ I }{1 \ mol \ I}[/tex]
Flip the fraction so the atoms of iodine will cancel out.
[tex]1.76*10^{23} \ atoms \ I*\frac{ 1 \ mol \ I}{6.022*10^{23} \ atoms \ I}[/tex]
[tex]1.76*10^{23}* \frac{1 \ mol \ I}{6.022*10^{23} }[/tex]
Multiply so the problem condenses into 1 fraction.
[tex]\frac{1.76*10^{23} \ mol \ I}{6.022*10^{23} }[/tex]
[tex]0.2922617071 \ mol \ I[/tex]
2. Convert Moles to Grams
Now we must use the molar mass of iodine, which is found on the Periodic Table.
Iodine Molar Mass: 126.9045 g/molUse this mass as a fraction.
[tex]\frac{ 126.9045 \ g\ I }{ 1 \ mol \ I}[/tex]
Multiply this fraction by the number of moles found above.
[tex]0.2922617071 \ mol \ I*\frac{ 126.9045 \ g\ I }{ 1 \ mol \ I}[/tex]
Multiply. The moles of iodine will cancel.
[tex]0.2922617071 *\frac{ 126.9045 \ g\ I }{ 1 }[/tex]
The 1 as a denominator is insignificant.
[tex]0.2922617071 *{ 126.9045 \ g\ I }[/tex]
[tex]37.08932581 \ g \ I[/tex]
3. Round
The original measurement of 1.76*10^23 has 3 significant figures (1, 7, and 6). Therefore we must round our answer to 3 sig figs. For this answer, that is the tenths place.
[tex]37.08932581 \ g \ I[/tex]
The 8 in the hundredth place tells us to round the 0 up to a 1.
[tex]\approx 37.1\ g \ I[/tex]
There is about 37.1 grams of iodine in 1.76*10^23 atoms.
Which element has the same number of energy levels as aluminum (Al) and the same number of valence electrons as calcium (Ca)
Answer:
magnesium (Mg)
Explanation:
Answer:
Be (Beryllium)
Explanation:
Why krypton and noble gas are not used in airships using the periodic table?
Answer:
Since the noble gases are unreactive or inert, they are safe to use. Helium is used to fill balloons and airships, because it is much lighter that air and it will not catch fire. Neon is used in advertising signs. It will give red glow, but the color can be changes by mixing it with other gases.
Explanation:
What is an example of heating water until it boils?
I
3. In words, explain what occurs in terms of electrons when
beryllium reacts with oxygen
Explanation:
On the whole, the metals burn in oxygen to form a simple metal oxide. Beryllium is reluctant to burn unless it is in the form of dust or powder. Beryllium has a very strong (but very thin) layer of beryllium oxide on its surface, and this prevents any new oxygen getting at the underlying beryllium to react with it
How would decreasing the pressure affect the equilibrium of this reaction? Hat 12 32H1 O A. The reaction would remain in equilibrium B. HI would react to produce more H2 and 12 more quickly. O C. H2 and 12 would react to produce HI more quickly. D. All of the molecules would react more slowly.
A. The reaction would remain in equilibrium
Further explanationGiven
Reaction
H₂ + I₂ ⇔ 2HI
Required
the effect of pressure changes
Solution
In the equilibrium system :
Reaction = - action
⇒shift the reaction to the right or left.
The pressure usually affects the gas equilibrium system(only count the number of moles of gases)
The addition of pressure, the reaction will shift towards a smaller reaction coefficient ((the fewest moles of gas )
Reaction
H₂ + I₂ ⇔ 2HI
The reactant side of the equation has 2 moles of a gas(1 mole H₂ and 1 mole I₂) ; the product side has 2 moles HI
So the total number of moles from both sides is the same(2 moles) so that the change in volume (pressure) does not change the direction of equilibrium⇒No shift will occur
Answer:
A. The reaction would remain in equilibrium
Explanation:
Describe how you mathematically convert the measured mass of a
substance to moles? Create an example. PLEASE HELP
Answer:
no. of moles = measured mass of substance/ molar mass of the constituted elements
Explanation:
No. of moles of 2.0g NaCl= 2/(23+35.5) = 0.034mol
Table Salt or NaCl is composed of sodium and chlorine. While the individual elements of sodium and chlorine are very reactive, together they form a popular cooking and baking ingredient. In order to form a salt, an electron must be transferred from one element to the other. Which element (Na or Cl) is more likely to steal an outer electron from the other? Why?
Answer:
Chlorine is more likely to steal a valence electron from sodium.
Explanation:
Sodium is number 11 on the periodic table with one valence electron. Belonging to the first group, it's one of the alkali metal, which are known to be highly reactive. Chlorine is number 17 with seven valence electrons, and it's in the second-to-last group of halogens--also very reactive.
Considering that elements with one valence electron are just about 100% likely to give up electrons to reach a stable state, sodium would be the element that is more likely to lose its valence electron to chlorine. In other words, chlorine would be the electron thief.
Vertical columns on the periodic table are known as
and horizontal rows are called
O periods, groups
groups, periods
O metals, nonmetals
O metalloids, metals
Answer:
groups and periods
Explanation:
OMG GUESS WHAT GUYS YAYAYA
Answer:
What What What
Explanation:
Answer:
HAPPY BIRTHDAY!
Explanation:
Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?
The question is incomplete, the complete question is;
Giselle is working with a chemical substance in a laboratory. She observes that when the chemical is heated, it gives off a gas. She assumes that the gas is oxygen but decides to test this assumption to verify it. Which type of scientific knowledge is Giselle’s assumption?
A.
fact
B.
hypothesis
C.
law
D.
observation
E.
theory
Answer:
B.
hypothesis
Explanation:
A hypothesis is an intelligent guess put forward to explain an experimental observation. It is a tentative explanation for a scientific observation which must be subjected to careful verification.
Giselle’s assumption that the gas evolved is oxygen is a hypothesis. It must now be tested carefully in order to verify if the hypothesis is true.
PLZ HELP!
What would happen to work and power if the mass of the person walking was increased or decreased? EXPLAIN.
Answer:
it would decrease / increase with the mass
Explanation:
12. Which of these elements is most likely to attract electrons from another atom during chemical bonding?
O 1) Fe
2) C
3) AI
4) Cs
I think the correct answer of these qusion is 2
Can someone help me with a Rocks Presentation that is worth 90 points?
Answer:
Sure!!! Is there a g-mail so I can get a hold of you?
Explanation:
How much of the electromagnetic spectrum is visible to us
A. all of it
B. None of it
C. Most of it
D. A small part of it
A ____ is the remains of a once-living organism found in layers of rocks, ice, or amber
Answer:
fossil
Explanation:
the dead organism is called a fossil i think
Answer:
A fossil is the remains of a once-living organism found in layers of rocks, ice, or amber
Which kind of weather usually forms over the northwest United States in the summer because of maritime polar air masses? fog dry heat heavy snow heavy rain
Answer:
fog
Explanation:
Answer:
Fog :)
Explanation:
:) :) :) :) :) :) :) :) :) :) :) :) :)