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Tomtit [17]
2 years ago
8

A negative ΔH means an exothermic reaction. True False

Chemistry
1 answer:
slega [8]2 years ago
7 0
True a negative change in enthalpy means an exothermic reaction
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Match the scientists to their contributions to the development of the periodic table.
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Answer:

1. Dmitri Mendeleev

2. Johann Dobhereiner

3. John Newlands

4. Henry Moseley

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4 0
3 years ago
How many elements are found in the following chemical equation? K + Cl → KCl A. 1 B. 2 C. 3 D. 0
Gnesinka [82]
K is Potassium
Cl is Chlorine 
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5 0
3 years ago
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Phosphates are formed when phosphorus reacts with
777dan777 [17]

Answer: nitrogen

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6 0
3 years ago
Will lead (Pb) react with HgSO4?
lora16 [44]

Answer:

B

Explanation:

The electrochemical series can be used to check if a particular element has a greater activity than the other. Firstly, on the electrochemical series, it can be seen that lead is at a higher position compared to mercury. All things being equal, it will show a higher activity than mercury and hence can knock it off its salt.

Although it is the Overall standard electrode potential that tells us if a reaction is feasible or not, we can use the activity series to quickly discern if the reaction is possible or not. The overall standard electrode potential of both is positive which makes the reaction to be feasible and hence lead can display mercury off its salt

7 0
3 years ago
I still need help!!! I even asked my science teacher and she B. But idk...I’m torn between A and B!!! APEX
Radda [10]

“Water” is the best thermal insulator.

Option: B

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“Thermal insulators” are the materials which do not allow heat to transfer. “Water” is the substance which does not transfer heat. Hence, the “water” is the best “thermal insulator”. Water is the bad conductor of thermal heat. Water has “low thermal conductivity” than other substances, so this acts as an insulator as long as it is not traveled from one place to another. Heat is transferred when a “hot object collides” with “the cold objects”. The “thermal conductivity” of “water” is 0.6 W/m K.

6 0
3 years ago
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