Answer:
110.91 g of CaCl2
Explanation:
11.9 grams of CaCl₂ is required to make 1 Liter of 0.1M solution.
Calculating the amount of CaCl₂ required:
We first need to calculate the molecular weight of calcium chloride CaCl₂.
The atomic weight of Ca = 40.01
and the atomic weight of Cl₂ = 2×35.45 = 70.90
So, the molecular weight of CaCl₂ = 40.01 + 70.90 = 110.91
This means that 110.91 g of CaCl₂ mixed with enough water will produce 1Liter of 1M solution.
Now, to calculate the amount of CaCl₂ required to make 1 Liter of 0.1M solution we use:
grams of chemical = (molarity of solution in mole/liter) x (MW of chemical in g/mole) x (ml of solution) ÷ 1000 ml/liter
= 0.1 × 110.91 × 1000 ÷ 1000
= 11.09 grams
So, 11.09 grams of CaCl₂ will be used.
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Which of the following is least like the others on the list?
a. Glucose
b. Glycogen
c. Sucrose
d. Catalase
Answer:
catalase
Explanation:
catalase is enzime the rest are glucides
Place each object on the measurement tray, one at a time. Which objects have a mass greater
than 300 grams?
How do you know?
Answer:
The cube
Explanation:
When the cube is put on the triple beam balance it gives the mass of 429.3
You have 100. grams of potassium fluoride (KF). How many moles do you have? (1 mole KF = 58.09 g KF) *
1.00 mole KF
1.50 mole KF
1.72 mole KF
3.57 mole KF
Answer:
I think its 1.72 (:
Explanation:
4. How many joules of heat energy does it take to burn off 500 000 cal of potato chips?
(1 cal = 4.184 )) Show your work.
Answer:
[tex]2,092,000J[/tex]
Explanation:
Hello.
In this case, we need to perform a unit conversion problem between cal and joule, taking into account that 1 cal equals 4.184 joules of energy, therefore, we write the following proportional factor:
[tex]500,000cal*\frac{4.184J}{1cal}[/tex]
Whereas the 1 cal is written under the line in order to simplify the initial can and the 4.184 J on the line as joules are the required units. Thus, we obtain:
[tex]2,092,000J[/tex]
As the energy required to burn off such amount of energy given of potato chips.
Best regards.
How many electrons are located in the outermost orbit in the Bohr model of a boron atom?
A. 1
B. 2
C. 3
D. 4
According to the electronic configuration of boron, there are three electrons in the Bohr model of a boron atom.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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How do conduction and convection differ? (4 points)
Conduction can move through empty space to transfer heat; convection cannot.
Conduction does not require objects to have direct physical contact; convection does.
Conduction requires objects to have direct physical contact; convection does not.
Conduction transmits heat through electromagnetic waves; convection does not. PLS HELP
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas.
So I think you should go with the 3rd option.
Hope this was helpful.
Answer:
What the other guy said
Explanation:
What volume of water (in mL) is required to prepare a 3.000 M solution by dissolving 43.83 g of of NaCl.
Select one:
a. 250.0 mL
b. 2500.0 mL
c. 2.50 mL
d. none of these
e. 25.0 mL
Answer:
Option A. 250 mL
Explanation:
From the question given above, the following data were obtained:
Molarity of NaCl = 3 M
Mass of NaCl = 43.83 g
Volume of water =..?
Next, we shall determine the number of mole in 43.83 g of NaCl. This can be obtained as follow:
Mass of NaCl = 43.83 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mole of NaCl =?
Mole = mass/molar mass
Mole of NaCl = 43.83/58.5
Mole of NaCl = 0.749 mole
Next, we shall determine the volume of water required to prepare the solution as follow:
Mole of NaCl = 0.749 mole
Molarity of NaCl = 3 M
Volume of water =..?
Molarity = mole /Volume
3 = 0.749 /volume
Cross multiply
3 × volume = 0.749
Divide both side by 3
Volume = 0.749/3
Volume = 0.25 L
Finally, we shall convert 0.25 L to millilitres (mL). This can be obtained as follow:
Recall:
1 L = 1000 mL
Therefore,
0.25 L = 0.25 L × 1000 mL / 1 L
0.25 L = 250 mL
Therefore, 0.25 L is equivalent to 250 mL.
Thus, the volume of water needed to prepare the solution is 250 mL
Each student in a class placed a 2.00 g sample of a mixture of Cu and Al in a beaker and placed the beaker in a fume hood. The students slowly poured 15.0 mL of 15.8 M HNO3 into their beakers. The reaction between the copper in the mixture and the HNO3 is represented by the equation above. The students observed that a brown gas was released from the beakers and that the solutions turned blue, indicating the formation of Cu 2. The solutions were then diluted with distilled water to known volumes. The students determined that the reaction produced 0.010 mol of Cu(NO3)2. Based on the measurement, what was the percent of Cu by mass in the original 2.00 g sample of the mixture
Answer:
Percentage mass of copper in the sample = 32%
Explanation:
Equation of the reaction producing Cu(NO₃) is given below:
Cu(s)+ 4HNO₃(aq) ---> Cu(NO₃)(aq) + 2NO₂(g) + 2H₂O(l)
From the equation of reaction, 1 mole of Cu(NO₃) is produced from 1 mole of copper. Therefore, 0.010 moles of Cu(NO₃) will be produced from 0.010 mole of copper.
Molar mass of copper = 64 g/mol
mass of copper = number of moles * molar mass
mass of copper = 0.01 mol * 64 g/mol = 0.64 g
Percentage by mass of copper in the 2.00 g sample = (0.64/2.00) * 100%
Percentage mass of copper in the sample = 32%
What is the Theoretical yeild of CaCO3 from 2 g of CaCl2 and 2.5 g of K2CO3
Answer:
Theoretical yield of CaCO₃ is 2.002 g.
Explanation:
Given data:
Mass of K₂CO₃ = 2.5 g
Mass of CaCl₂ = 2 g
Theoretical yield of CaCO₃ = ?
Solution:
Chemical equation:
K₂CO₃ + CaCl₂ → CaCO₃ + 2KCl
Number of moles of K₂CO₃:
Number of moles = mass/molar mass
Number of moles = 2.5 g/ 138.205 g/mol
Number of moles = 0.02 mol
Number of moles of CaCl₂:
Number of moles = mass/molar mass
Number of moles = 2 g/ 110.98 g/mol
Number of moles = 0.02 mol
Now we will compare the moles of CaCO₃ with K₂CO₃ and CaCl₂.
CaCl₂ : CaCO₃
1 : 1
0.02 : 0.02
K₂CO₃ : CaCO₃
1 : 1
0.02 : 0.02
Theoretical yield of CaCO₃:
Mass = number of moles × molar mass
Mass = 0.02 mol × 100.1 g/mol
Mass = 2.002 g
Theoretical yield of CaCO₃ is 2.002 g.
What element has the following electron configuration:
1s22s22p63s23p2
Which atom has the greatest ionization energy?
C
N
O
F
Answer:
helium
The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
The kinetic energy of a golf ball is measured to be 143.3 J. If the golf ball has
a mass of about 47 g, what is its speed?
Answer:
V= in square root 2KE/M=2(143.3J)/0.047kg=6097.8723 in square root around 78.1 approxmete
Kinetic energy is directly proportional to the mass and square of speed of a moving body. Here, the speed of the body of mass 47 g or 0.47 kg with akinetic energy of 143.3 J is 24.6 m/s.
What is kinetic energy?Kinetic energy is a generated by virtue of motion of a body. It is half of the product of mass and square of velocity. Thus as mass is increase kinetic energy also increases.
If velocity is doubled then kinetic energy increases 4 times. Since velocity or speed is in square in the equation written as follows:
KE = 1/2 mv² . Here, m is the mass and v be the speed.
Here, kinetic energy is given 143.3 J and mass of the moving body is 0.47 kg and speed can be calculated by rearranging the equation as follows:
[tex]v = \sqrt{\frac{KE \times 2 }{m } \\\\\\ = \sqrt{\frac{43.3 J \times 2}{0.47 kg} \\\\\\\\\\\\\\ = 24.6 m/s[/tex]
Hence, the speed of the body of mass 47 g or 0.47 kg with akinetic energy of 143.3 J is 24.6 m/s.
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Explain the difference between the reactants and
products of a chemical reaction.
3
Answer:
:)
Explanation:
The substance(s) to the left of the arrow in a chemical equation are called reactants. A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
Do you agree in the Big Bang theory? Reasoning
What do you notice about the pattern of volcanoes?
Answer:
What patterns do volcanoes form?
Volcanoes occur at convergent plate boundaries were subducting oceanic crust is melted. This magma rises through the crust to form volcanoes and volcanic island arcs. Volcanoes occur at divergent plate boundaries where upwelling magma pushes between plates (rift zones) as the plates move apart.
electrictron configuration
Explanation:
So what do you wanna know? The definition?
In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation explained below.
Why is the wavelength of 633 nm used to analyze the standard solutions and drink samples?
Group of answer choices
The lower the wavelength, the blue solutions will absorb more light.
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Corresponding with blue light, is the wavelength that blue solutions absorb the most.
The higher the wavelength, the blue solutions will absorb more light.
Answer:
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Explanation:
When light is passed through a solution of a particular color, light of other wavelength or color, is absorbed and disappears, whereas the wavelength of light corresponding to the color of that solution is transmitted. The color of light absorbed the most is that which is complementary (opposite it in the color wheel) to the light which is transmitted. In a color wheel, blue is complementary to orange color, red is complementary to green and yellow is complementary to violet.
Therefore, in a blue substance (as in the blue solutions), there would be a strong absorbance of the complementary color of light, orange. Since the wavelength of orange color of light is between 600 - 640 nm, with maximum absorbance of orange light occurring around 633 nm, the wavelength of 633 nm is used to analyze the standard solutions and drink samples.
The purpose of a thermostat on a hot water boiler is:
HELP ASAP!!!........
Write out a balanced, molecular equation, total ionic equation, and net ionic equation for each:
1. Mg(NO3)2(aq) + Na2CO3(aq) -->
2. AgNO3(aq) + KCl(aq) -->
3. Al(s) + HCl(aq) -->
4. HNO3(aq) + Na2CO3aq) -->
Answer:
1:MgCO3 (s) + 2 NaNO3
2:agcl(s)+kno3(aq)
3:alcl3(aq)+h2(g)
4:NaNO3 + CO2 + H2O
(not sure abt last one)
3. Calculate the volume of a of .750 M solution containing 67.0 g of KNO3.
Answer : The volume of solution is 0.884 L
Explanation :
Molarity : It is defined as the number of moles of solute present in one litre of solution.
Formula used :
[tex]Molarity=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Volume of solution}}[/tex]
Solute is, [tex]KNO_3[/tex]
Given:
Molarity = 0.750 M
Molar mass of [tex]KNO_3[/tex] = 101 g/mole
Mass of [tex]KNO_3[/tex] = 67.0 g
Now put all the given values in the above formula, we get:
[tex]0.750M=\frac{67.0g}{101g/mole\times \text{Volume of solution}}[/tex]
[tex]\text{Volume of solution}=0.884L[/tex]
Therefore, the volume of solution is 0.884 L
the valency of nitrogen is 3 why
Answer:
The nitrogen atom has 5 electrons in the outermost shell, so it can accept 3 electrons to fulfil the octet structure. Therefore the valency of nitrogen is 3.
What is the organism that kills and eats other organisms for food called?
Group of answer choices
Host
Parasite
Predator
Prey
The water around you is in three different phases of matter: Select three.
gas
air
solid
liquid
How many moles of carbon are produced When 1745g of sugar react according to the equation C6H12O6+ H2SO4 to 6C +6H2O
Answer:
Number of moles of C produced = 58.08 mol
Explanation:
Given data:
Mass of sugar = 1745 g
Moles of C produced = ?
Solution:
Chemical equation:
C₆H₁₂O₆ + 6H₂SO₄ → 6C + 6(H₂SO₄.H₂O)
Number of moles of sugar:
Number of moles = mass/molar mass
Number of moles = 1745 g/180.16 g/mol
Number of moles = 9.68 mol
Now we will compare the moles of C and sugar.
C₆H₁₂O₆ : C
1 : 6
9.68 : 6×9.68 = 58.08 mol
Number of moles of C produced = 58.08 mol
Katiana wanted to figure out what type of liquid worked best for growing beans. She watered one with coca-cola, one with lemonade, and one with just water. After one week, she measured how high they had grown. Independent Variable (What I, the scientist test or change) *
What are differences between Jupiter and Saturn’s moons
Answer: Well one difference is that Jupiter's moons are large and are closer to each other. Also Jupiter has more moons than Saturn.
Explanation:
Answer:
The difference are :
jupiter moon saturn moon
1.jupitor moon has 4 1.saturn moon
moon has 7 moon
How to convert 118lbs to kg step by step
Answer:
53.524 Kilograms ( kg )Explanation:
Thank you ☺️☺️
10. A sample of an unknown composition was tested in a laboratory. The sample could not be broken down by
physical or chemical means. On the basis of these results, the laboratory reported that the unknown sample was
most likely
A. a compound
B. an element
C. a mixture
Answer:
it would be an element because its an element
Explanation:
a pan of boiling water on the stove is
conduction
convection
radiation