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umka2103 [35]
4 years ago
5

True or False

Chemistry
1 answer:
Alexxandr [17]4 years ago
8 0

Answer:

Its 26. True

27 . False

Explanation:

hope it helps !

mark me brainliest :))

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A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coefficient is "1". KOH + Cu(NO3)2 → KNO
svet-max [94.6K]

2KOH + Cu(NO3)2 → 2KNO3 + Cu(OH)2

2K⁺ 1Cu²⁺ 2K⁺ 1Cu²⁺

2OH ⁻ 2NO3⁻ 2NO3⁻ 2OH⁻

5 0
4 years ago
Glucose is the sole energy source, what fraction of the carbon dioxide exhaled by animals is generated by the reactions of the c
olganol [36]
2/3 is the fraction of the carbon dioxide exhaled by all of the animals that is generated by the reactions of the citric acid cycle, if the gluscose is the sole energy source. So if the glucose is the energy source the fraction of the carbon dioxide is 2/3. The answer in this question is 2/3
3 0
3 years ago
CADMIUM SOLUBILITY AND pH Cadmium is a toxic metal. It can be removed from water by chemical precipitation of solid cadmium hydr
Serga [27]

Explanation:

It is known that,

      Molar mass of Cd = 112.41 g/mol

Standard concentration of Cd = 0.005 mg/L = 0.005 \times 10^{-3} g/L

Hence, we will calculate the molarity as follows.

        Molarity = \frac{0.005 \times 10^{-3}}{112.41} mol/L

                       = 4.45 \times 10^{-8} M

Equation for the reaction is as follows.

          Cd(OH)_{2} \rightleftharpoons Cd^{2+} + 2OH^{-}

         K_{sp} = [Cd^{2+}][OH^{-}]^{2}]

          2 \times 10^{-34} = 4.45 \times 10^{-8} \times [OH^{-}]^{2}

          [OH^{-}] = 6.7 \times 10^{-4} M

Also,

         [H^{+}] = \frac{10^{-14}}{[OH^{-}]}

                      = \frac{10^{-14}}{6.7 \times 10^{-4}}

                      = 1.49 \times 10^{-11} M

Relation between pH and concentration of hydrogen ions is as follows.

               pH = -log [H^{+}]

                     = -log (1.49 \times 10^{-11} M)

                     = 10.82

Thus, we can conclude that a minimum pH of 10.82 is necessary to reduce the dissolved cadmium ion concentration to the standard.

4 0
3 years ago
Which two temperatures are equivalent?
S_A_V [24]

Answer:

273 °K annd 0°C are equivalent

3 0
3 years ago
What does the atomic number indicate?
mart [117]

Answer:

Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.

Explanation:

8 0
3 years ago
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