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3 years ago

Democritus who lived in greece during the fourth century

Chemistry

1 answer:

frutty [35]3 years ago

8 0

Atoms-Tiny particles of matter that cannot be divided

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12. Consider the reaction: 2H2+O2 2H2O Decreasing the temperature would the rate of reaction increase a. b. decrease not change

Artemon [7]

Answer: Option (b) is the correct answer.

Explanation:

As the given reaction is as follows.

$2H_{2} + O_{2} \rightarrow 2H_{2}O$

So, when we decrease the temperature for this reaction then there will be decrease in kinetic energy of reactant molecules. As a result, less number of collisions will take place.

Hence, there will be decrease in rate of chemical reaction.

Thus, we can conclude that in the given reaction decreasing the temperature would also decrease the rate of reaction.

4 0

3 years ago

Science investigation skills

9966 [12]

People conduct scientific investigations by formulating a hypothesis and observing the results. They then draw conclusions from those results and then share those conclusions with the larger scientific community.

8 0

3 years ago

A space probe on the surface of mars sends a radio signal back to earth,a distance of 7.19 ×10⁷ km. Radio travel at the speed of

lys-0071 [83]

Answer:

240 seconds

Explanation:

Data Given:

Distance Radio travel to earth = 7.19 ×10⁷ km

Speed of this radio signal = 3.00 ×10⁸ m/s

Solution:

First convert Km to m

1 km = 1000 m

7.19 ×10⁷ km = 7.19 ×10⁷ x 1000 = 7.19 × 10¹⁰m

Formula used to calculate time

Speed (S) = distance (d) / time (t)

rearrange above equation for time

time (t) = distance (d) / Speed (S) . . . . . . . . .(1)

Put values in equation 1

time (t) = 7.19 × 10¹⁰/ 3.00 ×10⁸ m/s

time (t) = 240 s

So 240 seconds it take for the signal to reach the earth

6 0

4 years ago

What is the reactant for sodium nitrate + water?

kupik [55]

Answer:

NaNO+H2O

Explanation:

5 0

3 years ago

There are several aromatic compounds with the formula C8H9Cl. Draw those that have a trisubstituted ring where the methyl groups

Kryger [21]

Answer:

$3-Chloro-1,2-dimethylbenzene$

$4-Chloro-1,2-dimethylbenzene$

Explanation:

Such types of compounds in which conjugated planer ring system and delocalized pi electrons are present are called aromatic compounds such as Toluene, Benzene and some other. Generally, these compounds follow Huckle's rule. The trisubstituted ring means a compound in which three hydrogen atoms are replaced by three other groups. In the given compound two hydrogen atoms are replaced by two methyl groups and one hydrogen atom is replaced by one Chlorine atom. From the given compound $3-Chloro-1,2-dimethylbenzene$ , and $4-Chloro-1,2-dimethylbenzene$ can be drawn.

7 0

4 years ago