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creativ13 [48]
3 years ago
13

Let’s say you try to get crafty. Instead of directly heating your carbontetrachloride with the Bunsen Burner, you decide it woul

d be better to drop in a hot chunk of thorium (d = 11.724 g/mL , c = 0.12 J/g*K ) metal. If you have a 29.848 g chunk of thorium, how hot (in K) must you heat the thorium in order for the chunk of metal to have enough energy to heat a 1.027 mL sample of carbontetrachloride at room temperature (298 K) to it's boiling temperature?

Chemistry
1 answer:
sergejj [24]3 years ago
5 0

Explanation:

Below is an attachment containing the solution.

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Which element has a 4s sublevel with 2 electrons for its outermost electrons.
Papessa [141]

Answer:

Calcium

Explanation:

Hi!

So, the best way to solve this is with a period table with all of the sublevels labeled. (check below)

So the s sublevel starts at 1s which is Hydrogen. If you go down 4 rows, or periods, you get to sublevels 4s. As you should know, as you go across groups/columns, the valence electrons get higher. So the element that you are looking for has 2 valence electrons. So, the element you are looking for should be 4 down and 1 right of Hydrogen which is: Calcium

I hope I helped and have a wonderful evening!

3 0
3 years ago
Read 2 more answers
After the completion of a gas forming reaction, the column of water remaining in the collection flask was measured to me 55 mm h
baherus [9]

Answer:

The partial pressure of the gas produced by the reaction is 0.9187 atm

Explanation:

Given;

vapor pressure of water, \rho_w = 0.0313 atm

measured atmospheric pressure, P_{Total} = 0.950 atm

partial pressure of the gas produced by the reaction = ?

According to Dalton's law of partial pressure; total pressure is equal to sum of partial pressure of water vapor and gas produced.

P_{Total} = P_{gas} + P_{water}

P_{gas} = P_{Total} -P_{water}

P_{gas} = 0.95 - 0.0313

P_{gas} = 0.9187 atm

Therefore, the partial pressure of the gas produced by the reaction is 0.9187 atm

3 0
4 years ago
List four observations that indicate that a chemical reaction may be taking place
olga55 [171]

Answer :

For a given reaction to take place, there might be at least one of these (7) signs;

- formation of gas bubbles, formation of a precipitate (creation of a solid from a solution), a change in color, a change in volume (due to change in density), a change in temperature (endothermic or exothermic), change in taste or smell and emission of light or fire..


6 0
3 years ago
Which example indicates that a chemical change has occurred? *
andrezito [222]

Answer:

A. When two aqueous solutions are mixed, a precipitate is formed.

Explanation:

The precipitate (a solid substance that falls from the liquid) is the result of a chemical reaction taking place between the liquids.

The other three answer choices are indicative of physical changes (temperature change, phase change, color change).

7 0
3 years ago
In a chemical equation, if 2 atoms of chlorine are used in the reactants to form calcium chloride, how many formula units of cal
elena-s [515]

Explanation:

The given reaction is as follows.

    Ca + Cl_{2} \rightarrow CaCl_{2}

The number of elements on reactant side are as follows.

  • Ca = 1
  • Cl = 2

The number  of elements on product side are as follows.

  • Ca = 1
  • Cl = 2

Therefore, the equation is completely balanced.

Thus, we can conclude that only one formula units of calcium chloride must be part of the products.

5 0
3 years ago
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