Answer: 29%
Explanation:
Answer:
b 29 percent
Explanation:
Which of the following contains the most electrons?
multiple choice
A - Sn2+
B - Sna+
C - Both have the same number of electrons
Which determines the reactivity of an alkali metal?
A) its boiling and melting points
B) the shininess of its surface
C) the number of protons it has
D) its ability to lose electrons
ill give brainliest
Answer:
D
Explanation:
It only has one valence electron.
If 2.03 g of oxygen react with carbon monoxide, how many grams of CO2 are formed?
Answer:
The suitable equation for this reaction is
2CO + O₂ -----> 2CO₂
Here, we are given that we have 2 grams of O₂
From the equation, we can see that 2 * Moles of O₂ = Moles of CO₂
Moles of O₂:
2/32 = 1/16 moles
Therefore, the number of moles of CO₂ is twice the moles of O₂
Moles of CO₂ = 2 * 1/16
Moles of CO₂ formed = 1/8 moles
Mass of CO₂ formed = Molar mass of CO₂ * Moles of CO₂
Mass of CO₂ formed = 44 * 1/8
Mass of CO₂ formed = 5.5 grams
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An object has a variable volume and shape before it changes state. After the
change, it can still change in shape but has a fixed volume. Which change of
state has occurred
According to the concept of forces of attraction , the change of state that has occurred is gas to liquid.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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Why are measurements always at least a little uncertain?
Answer:
because measuring instruments have an uncertainty of +-1 or mor
1pt Which part of the scientific method helps you figure out what you've learned?
O A. Predict
OB. Observe
O c. Design
OD. Analyze
A 4.24 kg marble slab has a volume of 1564 cm³ what is its density in grams per centimeters cubed
Answer:2.71g/cm3
Explanation:
A tank contains 120.0 g chlorine gas (Cl2), which is at temperature 76.0°C and absolute pressure 5.70 ✕ 105 Pa. The temperature of the air outside the tank is 19.0°C. The molar mass of Cl2 is 70.9 g/mol. (a) What is the volume of the tank (in m3)? m3 (b) What is the internal energy of the gas (in J)? J (c) What is the work done by the gas (in J) if the temperature and pressure inside the tank drop to 31.0°C and 3.80 ✕ 105 Pa, respectively, due to a leak? (Assume that the air outside the tank can be treated as a vacuum.)
Answer:
Explanation:
Given that:
mass of chlorine gas = 120.0 g
the molar mass of Cl₂ = 70.9 g/mol
The number of moles of chlorine gas = mass/molar mass
The number of moles of chlorine gas = 120.0 g / 70.9 g/mol
The number of moles of chlorine gas = 1.69 mol
Pressure = [tex]5.70 \times 10^5 \ Pa[/tex]
Temperature = 19.0°C = (273 + 76) K = 349 K
Universal Gas constant R = 8.314 J/mol/K
Using Ideal gas equation:
PV = nRT
V = nRT/P
V = (1.69 × 8.314 × 349)/ [tex]5.70 \times 10^5[/tex]
V = 4903.68034/ [tex]5.70 \times 10^5[/tex]
V = 0.008603 m³
Thus, the volume V of the tank = 0.008603 m³
For diatomic gas, the internal energy can be calculated by using the formula:
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times nRT[/tex]
internal energy [tex]E_{int}[/tex] = [tex]\dfrac{5}{2} \times 1.69 \times 8.314 \times 349[/tex]
internal energy [tex]E_{int}[/tex] = 12259.2 J
If there is a temperature and pressure drop;
the new temperature = 31.0°C = (273 + 31) K = 304 K
the new pressure = [tex]3.80 \times 10^5 \ Pa[/tex]
We need to understand that the aftermath of the reduction in chlorine gas resulted in a decrease in temperature and pressure. Since nothing is affecting the volume of the chlorine gas, then there is no work done.
Thus, work done will be zero because there is no change in the volume or an isochoric process.
Why is the atomic mass of iron, 55.845 amu, most similar to the mass of iron-56, yet less than 56 amu? The atomic mass is the simple average of the masses of the two most abundant isotopes. Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56. The second most abundant isotope is iron‑54, which reduces the atomic mass to less than 56 amu. The atomic mass is the weighted average of the masses of all of the isotopes. Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56. The second most abundant isotope is iron‑54, which reduces the atomic mass to less than 56 amu. The atomic mass is the weighted average of the masses of the two most abundant isotopes. Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56. The second most abundant isotope is iron‑54, which reduces the atomic mass to less than 56 amu. The atomic mass is the simple average of the masses of all of the isotopes. Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56. The second most abundant isotope is iron‑54, which reduces the atomic mass to less than 56 amu.
Answer:
Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56.
Explanation:
The atomic abundance of the isotopes of Iron is:
⁵⁴Fe: 5.82%
⁵⁶Fe: 91.66%
⁵⁷Fe: 2.19%
⁵⁸Fe: 0.33%
Where the Iron-56 is the most abundant isotope of Iron atom
As atomic mass is defined as the sum of the masses of the ions multiplied by its abundance, and the Iron-56 is the most abundance isotope, the atomic mass of Fe most be similar to the ⁵⁶Fe mass because is the most abundant isotope.
Right option is:
Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56.Iron‑56 is the most abundant isotope, so the atomic mass of iron is most similar to the mass of iron‑56.
the atomic abundance of the isotopes of Iron is:
⁵⁴Fe: 5.82%
⁵⁶Fe: 91.66%
⁵⁷Fe: 2.19%
⁵⁸Fe: 0.33%
Since the Iron-56 is the most abundant isotope of the Iron atom
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n a coffee cup calorimeter, 100.0 mL of 1.0M NaOH and 100.0 mL of 1.0M HCl are mixed. Both solutions were originally at 24.6 degrees Celsius. After the reaction, the final temperature is 31.3 degrees Celsius. Assuming that all the solution have a density of 1.0g/cm3 and a specific heat capacity of 4.18 J/oCg, calculate the enthalpy change for the neutralization of HCl by NaOH. Assume that no heat is lost to the surroundings or to the calorimeter.
Answer:
Explanation:
mass of the solution = volume x density = 200 x 1 = 200 gm
heat absorbed = m x s x Δ t , s is specific heat , Δt is rise in temperature
= 200 x 4.18 x ( 31.3 - 24.6 )
= 5601 J .
This is the enthalpy change required.
Which subatomic particle is positively charged?
Proton
Neutron
Electron
Conclusion of Newton law of motion
Answer:
Hope this helps
Explanation:
All object continues to be in its state of rest or uniform motion unless acted upon by an external unbalanced force. The rate of change of momentum of an object is proportional to the unbalanced force in the direction of the force. 3rd law every action has an equal and opposite reaction.
How many elements are there in CH3 CH2COONa
Answer:
There are
Explanation:
There are 10 elements in CH3CH2COONa.
Question 1
Ernest Rutherford completed his famous gold foil experiment in 1911. In this experiment, alpha particles were fired at a thin sheet of gold foil. He observed that most of the alpha particles passed straight through the gold foil unimpeded, but a small number of alpha particles were deflected. Which of the following conclusions about atomic structure were made from Rutherford’s gold foil experiment?
Answer: gold foil. It's in the experiment's name
What volume (in mL) of a 0.150 M HNO3 solution will completely react with 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced chemical equation?
Na2CO3(aq)+2HNO3(aq)→2NaNO3(aq)+CO2(g)+H2O(l)
In the reaction in Part A, what mass (in grams) of carbon dioxide forms?
Answer:
Explanation:
where are the anwser choices
Answer:
First part: volume of HNO3 solution = 51.4 mL
Second part: mass of CO2 = 0.170 g
Explanation:
First part:
Based on the volume and concentration of the Na2CO3 solution, there is 3.86 mmol of Na2CO3 available to react with HNO3 . Considering the stoichiometric relationship, you then calculate the volume of a 0.150 M solution that contains 7.71 mmol of HNO3 .
51.4 mL
Second part:
Since the reactant and product have a stoichiometric relationship that is 1:1, 0.00386 mol of Na2CO3 can react to form 0.00386 mol of CO2 . The molar mass of CO2 (44.01 g/mol ) is then used to convert the moles to the corresponding mass in grams.
0.170 g
Which of the following notations is the correct noble gas configuration for
Co?
A. [Ar]48237
B. [Ar]4524p63d
O C. [Kr]4s24p64d
D. [Co]48237
Answer:
The notation of configuration of Co is [tex][Ar] 3d^7 4s^2[/tex]
(A) is correct option.
Explanation:
Given that,
The following notations is the correct noble gas configuration for Co.
(A). [Ar] 3d⁷ 4s²
(B). [Ar] 4s² 4p⁶ 3d
(C). [Kr] 4s² 4p⁶ 4d
(D). [Co] 3d⁷ 4s²
We know that,
Cobalt :
Co is the symbol of cobalt which is a chemical element.
Atomic number of Co is 27.
We need to find the notation of the configuration of noble gas Co
Using configuration
[tex]Co_{27}=2, 8, 15, 2[/tex]
[tex]Co_{27}=1s^2, 2s^2,2p^6, 3s^2 3p^6 3d^7, 4s^2[/tex]
So, we can write as the notation of noble gas configuration
[tex]Co_{27}=[Ar] 3d^7 4s^2[/tex]
Hence, The notation of configuration of Co is [tex][Ar] 3d^7 4s^2[/tex]
(A) is correct option.
If 110. grams of potassium carbonate (K2CO3) is dissolved into 300. mL of solution, what is the molarity of the solution?
Answer:
2.65 M
Explanation:
Convert grams of K₂CO₃ to moles. The molar mass is 138.205 g/mol.
(110 g)/(138.205 g/mol) = 0.796 mol
Convert milliliters of solution to liters.
300 mL = 0.300 L
Divide moles of K₂CO₃ by liters of solution.
0.796 mol/0.300 L = 2.65 mol/L = 0.265 M
Answer:
2.7 M
Explanation:
M=moles of solute/volume of solution (L)
First, you need to calculate the number of moles using the given mass and the molar mass.
110 g138.205 g/mol=0.80 mol
Then, you can solve for molarity using the molarity equation.
M=0.80 mol0.300 L=2.7 M
Remember, you need to convert mL to L before you can calculate molarity.
Suppose you buy some inflated party balloons that are at room temperature (about 20°C). What will happen to those
balloons if you take them outside on a cold day? Explain
Answer: Balloons taken outside on a cold day will shrink because, as the temperature decreases, the pressure and volume decrease also.
Explanation:
How is energy related to the change of state represented
by the model?
Atoms gain energy as a solid changes to a liquid.
Atoms gain energy as a solid changes to a gas.
O Atoms lose energy as a solid changes to a liquid.
O Atoms lose energy as a solid changes to a gas.
Answer:
Energy is related to the change of state represented by the model in this way - C. Atoms lose energy as a gas changes to a solid.
Explanation:
As a certain gas is changing its state into that of a solid material, its atoms are going to lose some energy.
Answer:
the answer is c
Explanation:
the person before me literally tells you that it's C!!
Apples are peeled, cored, and pureed to produce an unpasteurized applesauce. The applesauce must be heated to 96°C to ensure that it is microbiologically stable for hot fill packaging. A tube-in-tube heat exchanger is used to heat the applesauce (Cp = 3.83 kJ/kgK) from an initial temperature of 10°C to the target temperature. Steam at 130°C with 70% quality is used as the heating medium with the condensate leaving the heat exchanger at 130°C.
How much steam (mass flow rate in kg/hr) is required per kilogram of applesauce processed?
How many mL of a 1.50 M solution of cobalt(III) sulfate are required to make 400.0 mL of a 0.850 M solution of cobalt(III) sulfate? Determine the molarities of the ions in 1.50 M cobalt(III) sulfate.
Answer:
Answer. 600 g CaCl2 would be required to make 2 L of a 3.5 M solution.
What is a scientific law?
Answer:
Scientific laws or laws of science are statements, based on repeated experiments or observations, that describe or predict a range of natural phenomena. The term law has diverse usage in many cases across all fields of natural science.
How many kilojoules are needed to raise the temperature of 234 g of water from 19.8 C to 33.1 C?
Answer:
13 kJ
Explanation:
Use the following formula where Q is the Joules needed, m is the mass of the substance, c is the heat capacity, and ΔT is the change in temperature.
Q = mcΔT
The heat capacity of water is 4.186 J/g°C. The mass of water is 234 g. The change in temperature is 13.3°C.
Q = mcΔT
Q = (234 g)(4.186 J/g°C)(13.3°C)
Q = 13,027 J
Since the answer is in Joules, convert to kiloJoules.
13,027 J = 13.027 kJ ≈ 13 kJ
What is the mass of an atom with seven protons, seven neutrons, and eight electrons?
Answer:
14
Explanation:
mass number = protons + neutrons
Which structures are found only in plant cells, not in animal cells? O A and B O Band C O Cand D B D OD and A А с
Answer:B and C
Explanation:did the assignment
Determine the volume of an object that has a mass of 441 g and a density of 21 g/cm3.
Answer: 21cm^3
Explanation:
Volume Formula:
Mass / Density = Volume
441g/21g/cm^3 = 21cm^3
16H + 2MnO4 + 5C2O4 = 2Mn + 10CO2 + 8H2O MnO4 mol in 20 mL
Answer:
Titration of 50.00 mL of 0.0521 M sodium oxalate, Na2C2O4, required 38.71 mL of a potassium permanganate solution: 5 C2O42- + 2MnO4- + 16H+ = 2Mn2+ + 10 CO2 + 8H2O Calculate the molarity of the potassium permanganate solution.
Explanation:
If m and n are integers, which of the following must be an even integer? A. 2mn B. mn C. mn+2 d. mn-2 e. 3mn
4. A sample of nitrogen at 20 degrees Celsius was compressed to 300ml to
0.360mL and its new pressure was found to be 400 Pa. What was the
initial pressure in kPa?
Answer:
We are given:
V(i) = 0.3 L V(f) = 0.36 L
P(i) = x pa P(f) = 400 pa
T(i) = T(f) = 293 k
Using the gas formula:
PV = nRT
Since n , R and T are constant,
PV = k (where k is a constant)
Hence we can say that:
P(i) * V(i) = P(f) * V(f)
x * 0.3 = 0.36 * 400
x = 14.4/0.3
x = 480 pascals
Hence the initial pressure is 480 pascals
Converting to Kpa, we have to divide by 1000
Initial pressure (Kpa) = 0.48
What molecules does a plant need to make glucose in the process of photosynthesis? Choose all correct answers. carbon dioxide light oxygen water
Answer: carbon dioxide and water.
Explanation: I took the test
Answer:
water and carbon dioxide
Explanation:
i took the K12 test :p
19. The air, soil, and most foods and beverages are examples of _____. mixtures compounds pure substances elements
