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4 years ago

According to the following position vs. Time graph the bicyclist was

Chemistry

1 answer:

julia-pushkina [17]4 years ago

3 0

Answer:

According to the following position vs. Time graph the bicyclist was : D

D. Not moving for the first two seconds, then begin moving at the constant speed.

Explanation:

$Speed = \frac{Distance}{time}$

Along Y-axis = Distance in meters

Along X-axis = Time taken in second

For first 2 seconds the The object has not changed its position.There is Zero distance covered.So , Speed = 0
After 2 second,The Object changed the distance by equal amount in equal interval of time.(Uniform Speed).Hence at each point after 2 second, there is same value speed

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Polonium-218 undergoes beta decay, converting a neutron into a proton. Then the daughter isotope undergoes another beta decay, a

sergij07 [2.7K]

Answer: $^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e$ is the correct equation for beta decay.

Explanation:

When a beta particle, that is, $^{0}_{-1}e$ is emitted in a radioactive decay then it is known as beta decay.

Therefore, beta decay of Polonium-218 is as follows.

$^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e$

Therefore, we can conclude that $^{218}_{84}Po \rightarrow ^{218}_{85}At + ^{0}_{-1}e$ is the correct equation for the given beta decay.

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3 years ago

What are ionic bonds composed of?

Sonbull [250]

Answer:Ionic compounds are compounds composed of ions, charged particles that form when an atom (or group of atoms) gains or loses electrons. (A cation is a positively charged ion; an anion is a negatively charged ion.) Covalent or molecular compounds form when elements share electrons in a covalent bond to form molecules.

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3 years ago

Read 2 more answers

Would your work in cleaning the beach be considered physical or a chemical change to the environment? Explain your reasoning.

gregori [183]

Physical because it can easily turn back into the original "substance"

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4 years ago

Which of these is a benefit of including comments in your code

morpeh [17]

A benefit of including comments in your code is that it helps other programmers understand your code.

These are numbers and letters which are used to identify a particular thing at a point in time.

Comments can be put in a code so as to enable others know and understand real intentions about it etc.

Read more about Code here brainly.com/question/2217700

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2 years ago

Calculate the value of ΔG∘rxnΔGrxn∘ for the following reaction at 296 K. Ka = 2.9 × 10–8 and assume Ka does not change significa

oee [108]

Answer:

$\Delta G_{rxn}=42.7\frac{kJ}{mol}$

Explanation:

In this case, for the dissociation of hypochlorous acid, we know that the acid dissociation constant (Ka) is 2.9x10⁻⁸, which is related with the Gibbs free energy as shown below:

$\Delta G_{rxn}=-RTln(K)$

But in this case K is just Ka, therefore, at 296 K, it turns out:

$\Delta G_{rxn}=-8.314\frac{J}{mol*K}*296K*ln(2.9x10^{-8})\\\\\Delta G_{rxn}=42.7\frac{kJ}{mol}$

Such result, means that the reaction is nonspontaneous at the given temperature, it means it is not favorable (not easily occurring).

Best regards.

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3 years ago