answer: its 7290 joules.
explanations: the first procedure is to convert 1 pound to kilogram. 1 kg = 2.205 hence given 100 lb so we cross multiply. 1 kg * 100 = 2.205 * x
hence x= 45 kg. let's convert 1 mile per hour = 0.45 metre per second we cross multiply by 40 mile per hour. x= 40 * 0.45= 18 m/s.
KE= 1/2 * 45 * (18)^2
= 1/2 * 45 * 14580
= 7290joules
A sample of poisonous carbon monoxide gas, CO, contains 2.50 g carbon and 3.33 g oxygen. The
unknown gas X is analyzed and it is determined to be made of 0.75 g carbon and 2.00 g oxygen. Are
these data an example of the law of definite proportions, the law of multiple proportions, or neither?
What does the data tell you about the identity of gas X?
Answer:
Explanation:
In carbon monoxide ,
2.5 g of carbon reacts with 3.33 g of oxygen
In unknown gas X ,
.75 g of carbon reacts with 2 .00 g of oxygen
2.5 g of carbon will react with 6.66 g of oxygen in X gas .
Ratio of oxygen in two compounds , reacting with same mass of carbon
= 3.33 : 6.66
= 1 : 2 , a simple ratio
It follows law of multiple proportions .
First gas is CO or carbon monoxide
X gas is CO₂ or carbon dioxide .
In this gas , ratio of oxygen reacting with same amount of carbon is doubled .
which iconic compound is used as a building material?
Answer:
Magnesium oxide is an ionic compound that can be used as a building material. MO2 is actually a raw material that used in producing cement for building houses, buildings, and other constructions.
Explanation:
is there a relationship between the shape and polarity of the molecule
Answer:hi
Explanation:
Which problem that the most scientists believe is partly caused by carbon dioxide?
Answer:
Climate change
Explanation:
Climate change is primarily a problem of too much carbon dioxide (CO2) in the atmosphere. This carbon overload is caused mainly when we burn fossil fuels like coal, oil and gas or cut down and burn forests
0.715 g of Na2CO3 xH2O is required 20mL of semi-normal hydrochloric acid solution
for complete reaction. Find the value of x
The value of x : 2
Further explanationSemi-normal Hydrochloric acid solution = 0.5 N = 0.5 M
for titration :
M₁V₁n₁=M₂V₂n₂(1=HCl,2=Na₂CO₃)
[tex]\tt 0.5\times 20\times 1=M_2\times V_2\times 2\\\\M_2V_2=5~mlmol=5.10^{-3}mol[/tex]
[tex]\tt MW=\dfrac{mass}{mol}=\dfrac{0.715}{5.10^{-3}}=143~g/mol[/tex]
MW Na₂CO₃.xH₂O=143
MW Na₂CO₃.xH₂O = MW Na₂CO₃+ MW xH₂O = 143
MW Na₂CO₃ = 106 g/mol
MW xH₂O = 18x
Equation :
[tex]\tt 106+18x=143\\\\18x=37\\\\x=\dfrac{37}{18}=2.056\approx 2[/tex]
Using the Rydberg equation, calculate the energy for the following electronic transitions in a hydrogen atom and label each as an absorption or an emission. When calculating, watch your signs!
n = 3 → n = 1
a. Energy calculation
b. absorption or emission?
Answer:
-1.94 * 10^-18 J
Since the electron moved from a higher to a lower energy level (n = 3 → n = 1) it is an emission.
Explanation:
From Rydberg equation;
E = -RH(1/n^2final - 1/n^2initial)
For a transition from n = 3 → n = 1
RH = 2.18 * 10^-18 J
E = -(2.18 * 10^-18) (1/1^2 - (1/3^2)
E = -(2.18 * 10^-18) (1-1/9)
E= -(2.18 * 10^-18) (8/9)
E = -1.94 * 10^-18 J
410X
412
412
410
183
186
183R
Which two are isotopes?
What is the % of H20 in Sodium carbonate decahydrate, Na2CO3 • 10H2O
Answer:
Element Symbol # of Atoms
Sodium Na 2
Cobalt Co 3
Hydrogen H 20
Oxygen O 10
Explanation:
please help will give brainliest
Answer:
1st one is...
Explanation:
The 1st one is change in size or shape. 2nd one is formation of precipitate. 3rd one is physical change. 4th one is formation of gas.
A ballon that contains 0.75 l of gad at 25 c is cooled to - 100 c. Calculate the new volume of the baloon
Answer:
0.44L
Explanation:
Given parameters:
Initial volume = 0.75L
Initial temperature = 25°C = 273 + 25 = 298K
Final temperature = -100°C = 273 + (-100) = 173K
Unknown:
New volume of the balloon = ?
Solution:
According to Charles's law;
"the volume of a fixed mass of a gas varies directly as its absolute temperature if the pressure is constant".
Mathematically;
[tex]\frac{V_{1} }{T_{1} }[/tex] = [tex]\frac{V_{2} }{T_{2} }[/tex]
V and T are temperature values
1 and 2 are the initial and final states
Insert the parameters and solve;
[tex]\frac{0.75}{298}[/tex] = [tex]\frac{V_{2} }{173}[/tex]
298V₂ = 129.75
V₂ = 0.44L
22. In 4f12, the 12 stands for the
The 12 stands for the number of electrons that fill the f orbital
Further explanationIn an atom there are levels of energy in the shell and sub shell
This energy level is expressed in the form of electron configurations.
Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is
• s: 2 electrons
• p: 6 electrons
• d: 10 electrons and
• f: 14 electrons
4f¹² :
4 : number of shell
12 : the number of electrons that fill the f orbital
Chlorine (Cl) is 76% chlorine-35 and 24% chlorine-37. Determine the average atomic mass of chlorine. Show/Explain work.
Answer:
Average atomic mass of chlorine is 35.48 amu.
Explanation:
Given data:
Percent abundance of Cl-35 = 76%
Percent abundance of Cl-37 = 24%
Average atomic mass = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100
Average atomic mass = (76×35)+(24×37) /100
Average atomic mass = 2660 + 888 / 100
Average atomic mass = 3548/ 100
Average atomic mass = 35.48 amu
Average atomic mass of chlorine is 35.48 amu.
Is freeze-drying a physical change or chemical change?
Answer:
Physical change because it can go back to its original form.
Explanation:
PLZZZZZZZZZZZ
NEED HELP ASAP!!!!!
Answer:
wersawess. uioiiiuioii
Explanation:
shhshsbshsjbsnsbxbxjzn, jznshdkbdjdjsnsj
Answer:
ok
asap what is the meaning of it?
how does conc.H2SO4 reacts with sugar?
Calculate the molarity of the sodium acetate solution as described below.
A. Convert the mass of NaC2H3O2 weighed to moles nNaC2H3O2. Show work with dimensional analysis.
B. Convert the mL of water measured to L
Answer:
This question is incomplete.
Explanation:
This question is incomplete because of the absence of given mass and volume, however, the steps below will help solve the completed question. The molarity (M) of a solution is the number of moles of solute per liter of solvent. The formula is illustrated below;
Molarity = number of moles (n) / volume (in liter or dm³)
To calculate the number of moles of NaC₂H₃O₂, we say
number of moles (n) =
given or measured mass of NaC₂H₃O₂ ÷ molar mass of NaC₂H₃O₂
The volume of the solvent must be in liter (same as dm³). Thus, to convert mL to liter, we divide by 1000
The unit for Molarity is M (Molar concentration), mol/L or mol/dm³
___ The energy of moving particles.
a. Chemical Energy
b. Radiant Energy
c. Mechanical Energy
Classify which compounds will dissolve in water and which ones will not dissolve in water.
a. Accetone
b. I-propanol
c. Hexane
d. Methanol
e. Decane
Answer:
Dissolves in water: Acetone, 1-propanol, Methanol
Do not dissolve in water: Hexane, Decane
Explanation:
From the principle that like dissolves like,polar substances will dissolve in polar solutions, while non-polar substances will dissolve in non-polar substances.
Water is a polar solution, therefore, polar substances will dissolve in it.From the given options:
Acetone is a polar molecule, therefore, it will dissolve in water.
1-propanol is a polar molecule, therefore, it will dissolve in water.
Hexane is a non-polar molecule, therefore, it will not dissolve in water.
Methanol is a polar molecule, therefore, it will dissolve in water.
Decane is a non-polar molecule, therefore, it will not dissolve in water
What volume, in L, of a 6.3 M K2SO4 solution contains 44.1 g of K2SO4?
Which situation describes a chemical change?
A. Clay pressed into a mold takes on the shape of the mold.
B. Baking soda added to vinegar gives off carbon dioxide gas.
C. Chocolate changes from a solid to a liquid when heated.
D. Rubbing pencil lead onto paper changes the color of the paper.
Answer:
C
Explanation:
I just took the test
Answer:
B
Explanation:
which two smaller groups is the animals kingdom is divided into
A. sponges and arthropods
B. vertebrates and invertebrates
C. ectotherms and endotherms
D. class and order
Please help!!!!!
Please help!!!!!
Answer:
1.B
2.A
3. B
Explanation:
1. A chemical bond is the physical phenomenon of chemical substances being held together by attraction of atoms to each other through sharing
2. so 2 is electrons of one atom are transferred permanently to another atom.meaning the answer is A
3. is When atoms combine by forming covalent bonds, the resulting collection of atoms is called a molecule. We can therefore say that a molecule is the simplest unit of a covalent compound.
A chemical bond is an attraction between two atoms.
A ionic bond is A bond formed when atoms transfer electrons.
How long will it take to do generate 70 watts of power if I do 4900 Jules of work? HELP ASAP WILL GOVE BRAINLIEST‼️‼️
Answer:
Is it multiple choice or what I need to know the details
Explanation:
How many molecules are in 650.0 g Mg(OH)₂ ?
Answer:
6.711 × 10²⁴ molecules Mg(OH)₂
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
650.0 g Mg(OH)₂
Step 2: Define conversions
Avogadro's Number
Molar Mass of Mg - 24.31 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of Mg(OH)₂ - 24.31 + 2(16.00) + 2(1.01) = 58.33 g/mol
Step 3: Convert
[tex]650.0 \ g \ Mg(OH)_2(\frac{1 \ mol \ Mg(OH)_2}{58.33 \ g \ Mg(OH)_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ Mg(OH)_2}{1 \ mol \ Mg(OH)_2} )[/tex]
= 6.71061 × 10²⁴ molecules Mg(OH)₂
Step 4: Check
We are given 4 sig figs. Follow sig fig rules.
6.71061 × 10²⁴ molecules Mg(OH)₂ ≈ 6.711 × 10²⁴ molecules Mg(OH)₂
an objects kinetic energy increases as its velocity increases?
How many milliliters of alcohol are present in 720 mL of brandy?
Answer:
Answer : The volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
Explanation: As we are given that 40.0 % (v/v) alcohol solution. That means, 40.0 mL of alcohol present in 100 mL of solution.
Now we have to calculable the volume of alcohol in 675 mL solution.
As 100 mL of solution contains 40.0 mL of alcohol
So, 675 mL of solution contains alcohol
Thus, the volume of alcohol = 270 mL
Now we have to calculate the volume of water.
The volume of water = Volume of the solution - Volume of alcohol
Volume of water = 675 mL - 270 mL
The volume of water = 405 mL
Thus, the volume of water = 405 mL
Hence, the volume of water and alcohol present in 675 mL of this solution is 405 mL and 270 mL respectively.
The 720mL of an 80-proof brandy which is 40.0% (v/v) ethyl alcohol, contains 288 mL of ethyl alcohol.
What is volume/volume percentage?The Percent solutions can be expressed in the form of volume/volume percentage, weight/volume percentage, or, weight/weight percentage. The concentration of the solution in percentage is calculated as the fraction of the weight or volume of the solute related to the total weight or volume of the solution.
The solution where concentration requires to be represented in volume percent (v/v%) when the solute is a liquid phase. It is also applicable to the numerator and the denominator in volume units and is called volume/volume percent.
Volume percentage = (Volume of solute/volume of solution) x 100
The given brandy has ethyl alcohol the v/v % is 40 %.
It means the 40 ml of ethyl alcohol is present in the 100ml of brandy
Given the volume of brandy = 720 ml
Volume of ethyl alcohol in 720 ml of brandy = (40/100)×720 = 288 ml
Therefore, 288 ml of ethyl alcohol is present in 720 ml of brandy which is 40.0% (v/v) ethyl alcohol.
Learn more about volume/volume percentage, here:
https://brainly.com/question/13558694
#SPJ2
Your question is incomplete, but most probably complete question was,
An 80 proof brandy is 40.0% (v/v) ethyl alcohol. The "proof" is twice the percent concentration of alcohol in the beverage. How many milliliters of alcohol are present in 720 mL of brandy?
Calculate the heat evolved for the reaction of 2.50 L of B2H6 with 5.65 L of Cl2 according to the following reaction. Both reactant gases are initially at STP
B2H6(g) + 6 Cl2(g) —> 3 BCl3(g) + 6HCl(g) Delta H = -1396 kJ
The heat evolved with the [tex]\rm B_2H_6[/tex] has been 58.637 kJ.
From the balanced chemical equation, 1 mole of [tex]\rm B_2H_6[/tex] reacts with 2 moles of Chlorine to give 3 moles of boron chloride and 6 moles of HCl,
The chlorine has been required in double the quantity of boron hexahydride.
The moles of Chlorine has been the limiting reactant.
The chlorine that has been responsible for the reaction with [tex]\rm B_2H_6[/tex] will be:
6 Chlorine = 1 [tex]\rm B_2H_6[/tex]
5.65 L Chlorine = [tex]\rm \dfrac{5.65}{6}[/tex]
5.65 L Chlorine = 0.942 L [tex]\rm B_2H_6[/tex].
The moles of [tex]\rm B_2H_6[/tex] can be calculated as:
1 Mole = 22.4 L
Moles of [tex]\rm B_2H_6[/tex] in 0.942 L = 0.042 mol.
The heat evolved for 1 mole [tex]\rm B_2H_6[/tex] has been -1396 kJ.
The heat evolved for 0.042 mol [tex]\rm B_2H_6[/tex] = 0.042 × -1396 kJ.
The heat evolved = 58.637 kJ.
The heat evolved with the [tex]\rm B_2H_6[/tex] has been 58.637 kJ.
For more information about the heat evolved, refer to the link:
https://brainly.com/question/24245395
28.The chemical formula of a compound indicates
the source of the elements in the compound.
b. how elements are joined in the compound.
the alchemy symbols for the elements in the compound.
d. the relative proportions of the elements in the compound.
Answer:
d. the relative proportions of the elements in the compound.
Explanation:
The chemical formula of a compound indicates the relative proportions of the element in the compound.
The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts. For example HCl, contains one mole of hydrogen and 1 mole of Cl.How long is a wave traveling at 120 m/s if it has a frequency of 30 Hz?
Answer:
4 m
Explanation:
is trying to plate gold onto his silver ring. He constructs an electrolytic cell using his ring as one of the electrodes. He runs this cell for 94.6 minutes at 224.8 mA. How many moles of electrons were transferred in this process
Answer:
0.013 mole.
Explanation:
From the question given above, the following data were obtained:
Time (t) = 94.6 mins
Current (I) = 224.8 mA.
Mole of electrons (e) =?
Next, we shall convert 94.6 mins to seconds. This is illustrated below:
1 min = 60 s
Therefore,
94.6 mins = 94.6 min × 60 s / 1 min
94.6 mins = 5676 s
Thus, 94.6 mins is equivalent to 5676 s.
Next, we shall convert 224.8 mA to ampere (A). This can be obtained as follow:
1 mA = 1×10¯³ A
Therefore,
224.8 mA = 224.8 mA × 1×10¯³ A / 1 mA
224.8 mA = 0.2248 A
Thus, 224.8 mA is equivalent to 0.2248 A.
Next, we shall determine the quantity of electricity flowing in circuit. This can be obtained as follow:
Time (t) = 5676 s
Current (I) = 0.2248 A
Quantity of electricity (Q) =?
Q = it
Q = 0.2248 × 5676
Q = 1275.96 C
Finally, we shall determine the mole of electron by converting the quantity of electricity (i.e 1275.96 C) to number of electrons. This can be obtained as follow:
96500 C = 1 e
Therefore,
1275.96 C = 1275.96 C × 1 e / 96500 C
96500 C = 0.013 e
Thus, the mole of electron trasfered in the process is 0.013 mole.
