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liberstina [14]
2 years ago
15

Identify the world that is being described in each statement about the previous topic afterwards write the first letter of each

answer to the corresponding number of missing letters to reveal the words below
help me plss​

Chemistry
1 answer:
Westkost [7]2 years ago
4 0

Answer:

5. Richter magnitude scale

6. Magma

7. Epicenter

8. Seismographs/seismometers

9. Extinct volcanoes

10. Seismogram

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(NO3)2+H2O+NO that is the answer 
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What element is represented by the electron configuration ar 4s23d104p3?
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How many moles would a 3.9 g sample of Calcium Chloride contain?​
gtnhenbr [62]

Answer:

You can view more details on each measurement unit: molecular weight of CaCl2 or grams This compound is also known as Calcium Chloride. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles CaCl2, or 110.984 grams.

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3 years ago
Calculate the freezing temperature of the following solution of 0.50 M glucose (a covalent compound). Assume that the molality o
kirza4 [7]

Answer:

-0.93 °C

Explanation:

Hello,

The freezing-point depression is given by:

T_f-T_f^*=-iK_{solvent}m_{solute}

Whereas T_f is the freezing temperature of the solution, T_f^* is the freezing temperature of the pure solvent (0 °C since it is water), i the Van't Hoff factor (1 since the solute is covalent), K_{f,solvent} the solvent's freezing point depression point constant (in this case 1.86 C\frac{kg}{mol}) and m_{solute} the molality of the glucose.

As long as the unknown is T_f, solving for it:

T_f=T_f^*-iK_fm\\T_f=0C-1*1.86C\frac{kg}{mol}*0.5\frac{mol}{kg}  \\T_f=-0.93C

Best regards.

4 0
3 years ago
Acetylene C2H2 gas is often used in welding torches because of the very high heat produced when it reacts with oxygen O2 gas, pr
yawa3891 [41]

Answer:

The correct answer is 0.11 mol O₂

Explanation:

The chemical equation for the reaction of acetylene (C₂H₂) with O₂ to produce carbon dioxide (CO₂) and water (H₂O) is the following:

2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g)

The chemical equation is balanced : with the proper estequiometrical coefficients. According to this, 2 moles of C₂H₂ reacts with 5 moles of O₂ to give 4 moles of CO₂ and 2 moles of H₂O.

In order to calculate how many moles of O₂ are needed to produce 0.085 moles of CO₂, we multiply the 0.085 moles of CO₂ by the factor 5 moles O₂/4 moles CO₂ (because 4 moles of CO₂ are produced by 5 moles of O₂ according to the chemical equation):

0.085 moles CO₂ x (5 moles O₂/4 moles CO₂) = 0.10625 moles O₂ = 0.11 moles O₂

6 0
4 years ago
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