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Lady bird [3.3K]
3 years ago
7

Bob roller skates with a constant speed of 8 km/h. How long will he take to 2 poin

Chemistry
1 answer:
Jet001 [13]3 years ago
6 0

Answer: 1.25 hours (75 minutes)

Explanation: 1 hour / 8 km • (10 km) = 1.25 hours

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PLEASE ANSWER
k0ka [10]

Answer: The awnser is A

Explanation:

8 0
2 years ago
Read 2 more answers
K-40 is a radioactive isotope of potassium that undergoes beta decay. What is the product of this decay
Aleks [24]

Answer:

⁴⁰₂₀Ca + ⁰₋₁e

Explanation:

Beta decay:

Beta radiations are result from the beta decay in which electron is ejected. The neutron inside of the nucleus converted into the proton an thus emit the electron which is called β particle.

Properties of beta radiations:

The mass of beta particle is smaller than the alpha particles.

They can travel in air in few meter distance.

These radiations can penetrate into the human skin.

The sheet of aluminium is used to block the beta radiation

⁴⁰₁₉K → ⁴⁰₂₀Ca + ⁰₋₁e

The beta radiations are emitted in this reaction. The one electron is ejected and neutron is converted into proton.

5 0
3 years ago
Calculate Δ H ∘ in kilojoules for the reaction of ammonia (Δ H ∘ f =−46.1 kJ/mol) with O 2 to yield nitric oxide NO (Δ H ∘ f =91
Vitek1552 [10]
Ummmmmmm......... im in 6th grade and i do not understand 1 bit of this, but i tried, sorry! :)
7 0
2 years ago
calculate the standard potential arising from the reaction in which NADH is oxidized to NAD and the corresponding biological sta
melisa1 [442]

Answer:

-219.99kJ

Explanation:

The acronym '' NADH'' simply stands for what is known as coenzyme 1 with full meaning of Nicotinamide Adenine Dinucleotide Hydride. This substance is useful in the production of energy. The oxidation reaction of NADH causes it to produce NADP⁺ and the oxygen produces water when it is in the reduction process. The balanced equation for the oxidation reaction is given below as:

NADPH ---------------------------------------------------------------------> NADP⁺H⁺ + 2e⁻.

Also, the balanced equation for the reduction reaction is given below as:

\frac{1}{2} O₂ + 2H⁺ + 2e⁻ --------------------------------------------------------------> H₂O.

It can be shown from the above REDOX reaction that the total number of electrons getting transferred is 2.

The  Gibbs energy = -nFE. where n = 2, F = faraday's constant = 96485.3329 C and E = overall cell potential.

The overall cell potential = E[ reduction reaction] - E[oxidation reaction] = 0.82 - (- 0.32 ) = 1.14 V.

Hence, the Gibbs energy = - 2 × 96485.3329 × 1.14 = -219.99kJ

7 0
2 years ago
What is the ph value of water and salt?
Andreyy89
The ph value of water is 7 but a salt which is  derived from a weak acid will be less than 7 and a salt which is derived from a base will be above 7.

3 0
3 years ago
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