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3 years ago

What is one benefit and one limitation of comparative investigations

1 answer:

Ivan3 years ago

5 0

<span>1. Seeing broader picture: determining gray areas, overlaps, and exclusions, biases, the primary focus.

2. Bias. Sources may have hidden agenda, personal discrimination conscience or unconscious and a limited view of the short term, long term effects.</span>

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An ambulance took 2 hours to cover a distance of 10 kilometers. Find its speed.

bekas [8.4K]

Answer:

5km/hour

Explanation:

2hours = 10km

/2 /2

1 hour = 5km

7 0

3 years ago

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Balance each of the following redox reactions occurring in basic solution.MnO−4(aq)+Br−(aq)→MnO2(s)+BrO−3(aq)Express your answer

Ahat [919]

Answer : The balanced chemical equation is,

$2MnO_4^-(aq)+Br^-(aq)+H_2O(l)\rightarrow 2MnO_2(s)+BrO_3^-(aq)+2OH^-(aq)$

Explanation :

Rules for the balanced chemical equation in basic solution are :

First we have to write into the two half-reactions.
Now balance the main atoms in the reaction.
Now balance the hydrogen and oxygen atoms on both the sides of the reaction.
If the oxygen atoms are not balanced on both the sides then adding water molecules at that side where the more number of oxygen are present.
If the hydrogen atoms are not balanced on both the sides then adding hydroxide ion $(OH^-)$ at that side where the less number of hydrogen are present.
Now balance the charge.

The half reactions in the basic solution are :

Reduction : $MnO_4^-(aq)+2H_2O(l)+3e^-\rightarrow MnO_2(s)+4OH^-(aq)$ ......(1)

Oxidation : $Br^-(aq)+6OH^-(aq)\rightarrow BrO_3^-(aq)+3H_2O(l)+6e^-$ .......(2)

Now multiply the equation (1) by 2 and then added both equation, we get the balanced redox reaction.

The balanced chemical equation in a basic solution will be,

$2MnO_4^-(aq)+Br^-(aq)+H_2O(l)\rightarrow 2MnO_2(s)+BrO_3^-(aq)+2OH^-(aq)$

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3 years ago

Why are changes of state, for example, liquid water changing to steam, not considered to be chemical changes?

GREYUIT [131]

Answer:

A liquid changing to a gas is considered a physical change because it involves a change in one or more physical properties, but no change in the fundamental components that make up the substance.

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3 years ago

Explain how carbon moves in and out of the ocean.

Marta_Voda [28]

Answer:

Living things in the ocean are able to move carbon from the atmosphere into surface waters.

Explanation:

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3 years ago

What group is not assigned electron affinities on the periodic table?

Alexus [3.1K]

Answer:

Explanation:

halogen group

Electron affinities are negative numbers because energy is released. The elements of the halogen group (Group 17) gain electrons most readily, as can be seen from their large negative electron affinitie

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3 years ago

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