Chemical A and Chemical B react in an exothermic reaction. What can be known about what will happen when Chemical A and Chemical B are mixed together?The new substance will need more energy to form its chemical bonds than the old substance will release.
More energy will be released from the old substance than the new substance will need to form its chemical bonds.
The color will change as a result of the reaction.
The substance will bubble as a result of the reaction.
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Answer:
B
Explanation:
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Hydrocarbons are separated from each other by a process called cracking distillation. a. True b. False
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impact our understanding of the universe?
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Answer:Atomic theory established that all matter is made of tiny particles, a discovery that led to amazing scientific breakthroughs in areas from modern chemistry to nuclear energy.
Explanation:Atomic theory is the scientific theory that matter is composed of particles called atoms. Atomic theory traces its origins to an ancient philosophical tradition known as atomism.
B. Bias makes the results less reliable.
C. Bias makes the results easier to interpret.
D. Bias makes the results not publishable.
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Answer:
B
Explanation:
Bias may make one side look worse than they actually are.
Hope this helps :)
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Answer: The v/v in percent of diethyl ether in a solution is 2%.
Explanation:
To calculate the percentage volume by volume of a solute in a solution, we use the formula:
We are given:
Volume of solute = 50 mL
Volume of solution = 2.5 L = 2500 mL (Conversion factor: 1 L = 1000 mL)
Putting values in above equation, we get:
Hence, the v/v in percent of diethyl ether in a solution is 2%.
Volume of solution = 2.5 L x 1000 = 2500 mL
( V / V ) = ( 50 / 2500 ) x 100
( V/ V) =0.02 x 100 = 2.0 %
hope this helps!
(2) the atmospheric pressure decreases
(3) there is a catalyst present
(4) there are effective collisions between the particles
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Justification:
The collision theory explains the chemical reactions in terms of collisions. A chemical reaction takes place if two molecules collide effectively.
So, the first conditon is that the collision occur.
The second condition, that the collision be effective requires two conditions:
1) that the collision occurs with the proper orientation of the molecules, and
2) that the energy of collision be high enough to start the break of the original bonds ant the creation of the new bonds in the activated complex.
The energy required to form this activated complex is the activation energy.
So, an effective collision requires the proper orientation of the molecules when they collide and that the energy be equal or greater than the activation energy.
Temperature and catalyst are factors that affect the occurrence of those collisions, so they affect the rate of the reaction, by modifiying the number of collisions.
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Thelimitations of forensic drug chemistry is (1) they cannot create drugs out ofwht they learned in chemistry although they can create one, (2) theire line of expertiseis limited to the illegal drugs and crime committed acts.
They know how to identify the drugs found at crime scenes.