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Related Questions
A type of emergency apparatus that can be used where oxygen may be limited or where the air might be poisoned is based on the following reaction in which CO2 produced by your own respiration reacts and O2 gas is produced. Calculate the mass of KO2 needed to produce 25 g of oxygen gas.
4 KO2(s) + 2 CO2(g) 2 K2CO3(s) + 3 O2 (g)
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Answer:
so I don't know how to answer that
If a chemical reaction leaves you with a new
substance, what do you
think a physical
change/reaction will be?
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Answer:
Explanation:
During a physical temperature change, one substance, such as water will be heated. Because one compound is mixed in with another. Therefore, these reactants produce a product. When the reactants are mixed, the temperature change caused by the reaction is an indicator of a chemical change.
What is the most likely reason a computer model is used for a black hole?
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Answer:
Black holes are merely the most exotic example of the general principle that ... quantum computer stores bits on protons and uses magnetic fields to flip them. ... Powered by Standard Model software, the universe computes
Explanation:because they are mostly exotic
Find the volume in milliliters of 2.00 mol of an ideal gas at 36°C and a pressure of 1120 torr.
Use the ideal gas law and the appropriate Rvalue:
R=0.0821 atmL/mol. K
R= 8.31 kPa • L/mol •K
R= 62.4 torr • L/mol · K
mL
Answers
Answer:
V = 34430 mL
Explanation:
Given data:
Volume in mL = ?
Number of moles of gas = 2.00 mol
Temperature = 36°C (36+273= 309K)
Pressure of gas = 1120 torr
Solution:
Formula:
PV = nRT
V = nRT/P
V = 2.00 mol ×62.4 torr • L/mol · K × 309K / 1120 torr
V = 38563.2 torr • L / 1120 torr
V = 34.43 L
L to mL
34.43 L ×1000 mL / 1 L
34430 mL
how would you represent a sulfur isotope that contains 18 neutrons using the format
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Answer:
S–34
Explanation:
From the question given above, the following data were obtained:
Neutron number = 18
The isotope of sulphur still retains its atomic number of 16.
Recall:
Atomic number = proton number
Atomic number of sulphur (S) = 16
Therefore,
Proton number = 16
Next, we shall determine the mass number of the sulphur isotope. This can be obtained as follow:
Proton number = 16
Neutron number = 18
Mass number =.?
Mass number = Proton + Neutron
Mass number = 16 + 18
Mass number = 34
The symbol for sulphur is S.
Thus, the symbol of sulfur isotope that contains 18 neutrons is S–34
What happens to the atomic radius when an electron is gained?
O A. The negative ionic radius is larger than the neutral atomic radius.
O B. The negative ionic radius does not follow a trend with the neutral
radius.
O C. The negative ionic radius is smaller than the neutral atomic radius.
O D. The negative ionic radius is the same size as the neutral atomic
radius.
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Answer: A. The negative ionic radius is larger than the neutral atomic radius.
Explanation: Did the test just now
Which element represents 16 protons and 16 neutrons
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———
sulphur has atomic number 16, which signifies that it has 16 electron and 16 protons and 16 neutron
If an M&M weighs 0.88 grams, how much would a mole of M&Ms
weigh?
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Answer:
5.30x10²³g
Explanation:
A mole can be understood as an amount of something.
One mole of eggs are 6.022x10²³ eggs
One mole of atoms are 6.022x10²³ atoms
One mole of molecules are 6.022x10²³ molecules
And 1 mole of M&M are 6.022x10²³ M&M. As 1 M&M weighs 0.88g, 1 mole will weigh:
0.88g*6.022x10²³ =
5.30x10²³gOne mole of M&Ms will weigh 5.3 x 10²³ grams.
The given parameters
Weight of an M&M = 0.88 gramsOne mole of every substance contains 6.022x10²³ atoms of the substance.
Weight of an M&M, implies an atom of M&M.
1 atom --------- 0.88 grams
6.022x10²³ atoms = ?
= 0.88 g x 6.022x10²³
= 5.3 x 10²³ grams.
Thus, one mole of M&Ms will weigh 5.3 x 10²³ grams.
Learn more about number of atoms in a substance here: https://brainly.com/question/15193101
A certain shade of blue has a frequency of 7.08×1014 Hz. What is the energy of exactly one photon of this light? Planck's constant ℎ=6.626×10−34 J⋅s.
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Answer:
We have the final answer as
[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]
Explanation:
To find the energy of a photon of this light we use the formula
E = hfwhere
E is the energy
f is the frequency
h is the Planck's constant which is
6.626 × 10-³⁴ Js
From the question
f = 7.08×10¹⁴ Hz
We have
E = 7.08×10¹⁴ × 6.626 × 10-³⁴
We have the final answer as
[tex]4.69 \times {10}^{ - 19} \: \: J[/tex]
Hope this helps you
A student dissolves of sodium hydroxide in of water in a well-insulated open cup. He that observes the temperature of the water rise from to over the course of minutes. Use this data, and any information you need from the ALEKS Data resource,
NaOH(s) rightarrow Na+(aq) + OH-(aq)
You can make any reasonable assumptions about the physical properties of the solution. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.
1. Is this reaction exothermic, endothermic, or neither.
2. If you said the reaction was exothermic or endothermic, calculate the amount of neat that was released or absorbed by the reaction in this case.
3. Calculate the reaction enthalpy AW per mole of NaOH.
Answers
Answer:
This question is incomplete
Explanation:
This question is incomplete because of the absence of the ALEKS Data's resource. However the steps required to answer questions that tests the heat of solution and heat of reaction are all the same.
1. The description provided in the question is an exothermic reaction; this is because exothermic reaction is a reaction that releases/gives off heat into the environment. The heat given-off here is what the student observed as "the temperature of the water rise from to over the course of minutes".
2. To calculate the amount of heat that was released/heat of solution (q) in joules;
q = m × Cg × (T2 - Ti)
where m = mass of water (can also be represented as volume)
Cg = specific heat capacity of water (4.184 joules)
T2 = final temperature of the solution
Ti = initial temperature of the solution
(T2 -Ti) is temperature change of the solution
3. Generally, enthalpy change for exothermic reaction is negative
Hence the formula for enthalpy change/heat of reaction (ΔH);
ΔH = - (q/1000 ÷ number of moles of solute)
Where q is the heat of solution determined in (2) above
number of moles = mass/molar mass of solute
molar mass of NaOH = 23 + 16 + 1 = 40 g/mol (where Na = 23, O = 16 and H = 1)
Which of the following is NOT a
physical property?
A melting point
B state of matter
C density
D flammability
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Explanation:
All of the following can be considered physical properties EXCEPT: c
A. color.
B. boiling point.
C. flammability.
D. taste.
E. density.
Select the correct answer. What happens if you double the number of batteries used in a circuit? (Assume all of the batteries are the same.) ОА. . The current doubles only. O B. B. The voltage doubles only. O C. The current decreases. OD. The voltage decreases. O E. The voltage and current doubles.
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Answer:
THE ANSWER IS "O E. The voltage and current doubles."
I IT HELPS YOU....
Answer:
They are both doubled, answer E
Explanation: