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zheka24 [161]
3 years ago
7

A test tube can be used to hold

Chemistry
1 answer:
Andrej [43]3 years ago
5 0
What grade is this? I forgot but if u tell me the grade i can prob remember
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The decomposition of potassium chlorate into kcl & o2 is used as a source of oxygen in the laboratory. How many moles of pot
fredd [130]

Answer:

10moles of kcl

Explanation:

2 K C l O3 →  2 K C l  +  3 O 2

Notice that you have a  2 : 3  mole ratio between potassium chlorate and oxygen gas, which means that, regardless of how many moles of the former react, you'll always produce 2/3 times more moles of the latter.

15 mol of O2 * ((2mol of KCLO3)/(3mol of O2))= 15*2/3=10 Mol

5 0
4 years ago
Write a balanced half-reaction for the reduction of dichromate ion to chromium ion in acidic aqueous solution. Be sure to add ph
Serhud [2]

Answer:

The balanced half-reaction for the reduction of dichromate ion to chromium ion in acidic aqueous solution:

Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^-\rightarrow 2Cr^{3+}(aq)+7H_2O(l)

Explanation:

The reaction :

Cr_2O_7^{2-}\rightarrow Cr^{3+}

Balancing of reaction in an acidic medium:

Step 1: Balance the atoms in the reaction:

Cr_2O_7^{2-}(aq)\rightarrow 2Cr^{3+}(aq)

Step 2: Balance oxygen atom by adding water on the side where no oxygen or less oxygen atom is present;

Cr_2O_7^{2-}(aq)\rightarrow 2Cr^{3+}(aq)+7H_2O(l)

Step 3: Balance the hydrogen atom by adding  hydrogen ions on the side where water is absent:

Cr_2O_7^{2-}(aq)+14H^+(aq)\rightarrow 2Cr^{3+}(aq)+7H_2O(l)

Step 4: Now balance charge by adding electrons on the side where more positive charge is present

Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^-\rightarrow 2Cr^{3+}(aq)+7H_2O(l)

The balanced half-reaction for the reduction of dichromate ion to chromium ion in acidic aqueous solution:

Cr_2O_7^{2-}(aq)+14H^+(aq)+6e^-\rightarrow 2Cr^{3+}(aq)+7H_2O(l)

6 0
3 years ago
What volume, in Liters, of a 2.00 M KCl solution contains 2.5kg of KCl? Molar mass of KCl= 74.55g/mole
Julli [10]
C_{m}=\frac{n}{V_{r}}\\\\
n=\frac{m_{s}}{M}\\\\
C_{m}=\frac{m_{s}}{MV_{r}} \ \ \ |*MV_{r}\\\\
C_{m}MV_{r}=m_{s} \ \ \ |:C_{m}M\\\\
V_{r}=\frac{m_{s}}{C_{m}M}\\\\\\
m=2.5kg=2500g\\
M=74.55\frac{g}{mol}\\
C_{m}=2\frac{mol}{L}\\\\
V_{r}=\frac{2500g}{2\frac{mol}{L}*74.55\frac{g}{mol}}\approx16.77L
7 0
3 years ago
What is the most likely product of hydration of CH3CH=CH2 ?
nikdorinn [45]

Answer is: C. CH3CHOHCH3.

Balanced chemical reaction of hydration of propene:

CH₃CH=CH₂ + H₂O → CH₃CHOHCH₃.

A hydroxyl group (OH⁻) attaches to one carbon of the double bond and a proton (H⁺) adds to the other carbon of the double bond according to Markovnikov's rule (hydrogen gets attached to the carbon with more hydrogen substituents).

Product of this reaction is propan-2-ol (isopropyl alcohol).

7 0
3 years ago
When elements combine to form compounds, chemical bonds form between the
photoshop1234 [79]

Answer:

electrons

Explanation:

When elements combine to form compounds, chemical bonds form between the  atoms. Bonds form when atoms share or exchange  electrons in a way that gives each atom a complete outer shell.

For example:

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.  

For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between anion and cations and have complete octet.

Covalent bond:

It is formed by the sharing of electron pair between bonded atoms.  

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive.  Both have complete octet.

7 0
3 years ago
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