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4 years ago

An objects mechanical energy is the sum of its?

Chemistry

1 answer:

frosja888 [35]4 years ago

3 0

Mechanical energy of an object can be the result of its motion
i think

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Given that at 25.0 ∘C Ka for HCN is 4.9×10−10 and Kb for NH3 is 1.8×10−5, calculate Kb for CN− and Ka for NH4+. Enter the Kb val

neonofarm [45]

Explanation:

Using the expression :

$K_a\times K_b=K_w$

Where, $K_w$ is the dissociation constant of water.

At $25\ ^0C$ , $K_w=10^{-14}$

Thus, for HCN , $K_a=4.9\times 10^{-10}$

$K_b$ for CN⁻ can be calculated as:

$K_a\times K_b=K_w$

$4.9\times 10^{-10}\times K_b=10^{-14}$

$K_b=2.0\times 10^{-5}$

Thus, for NH₃ , $K_b=1.8\times 10^{-5}$

$K_a$ for $NH_4^+$ can be calculated as:

$K_a\times K_b=K_w$

$K_a\times 1.8\times 10^{-5}=10^{-14}$

$K_a=5.6\times 10^{-10}$

5 0

4 years ago

Which statement best describes why a machine is useful? A machine does a greater amount of work than the amount of work that is

malfutka [58]

"A machine can decrease either the input force or the input distance needed to do a given amount of work" is the best statement that describes why a machine is useful.

Answer: Option D

Explanation :

A machine is simply defined as a device that helps humans, helping them to transfer the required amount of force to compete any task, changing the direction of motion, increasing the magnitude of force to complete any task, reduce the time or distance needed to cover while performing any task.

Machines can be simple mechanical device or a combination of multiple mechanical or technical devices to reduce the amount of input force or increase the output.

8 0

4 years ago

Read 2 more answers

Many gardeners add earthworms to their soil if none are already living there. Why would gardeners do this?

Ksenya-84 [330]

The correct answer is D, earthworms eat the dirt, and then release it into the soil. They turn the dirt and soil into fertilizer so to speak. Worms also leave holes in the ground, which is good for water and air for the plants roots, but that isn't an option.

8 0

3 years ago

isotopes of an element will always have the same a. number of protons. b. number of neutrons. c. number of electrons. d. mass.

Nastasia [14]

Your answer is same number of protons

3 0

3 years ago

What are the reactants of lactic acid fermentation

andrew11 [14]

Answer:

energy story for lactic acid fermentation

Explanation:

the reactants are pyruvate NADH and proton

3 0

3 years ago