CAN SOMEONE THATS GOOD AT CHEM PLEASE HELP ME?!?!I’LL GIVE 50 POINTS!!!
AND A BRAINIEST!!!
PLEASE I HAVE OTHER HW TO DO:(
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Answer:
Explanation:
1. q=mcat
q = (20)(4.184)( 30-20)
q = 836.8
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According to the collision theory and the model created to explain the collision theory, why does a catalyst cause a reaction to speed up?It lowers the required activation energy. It increases the collisions per minute. It increases the average kinetic energy of the particles. It increases the kinetic energy and the collisions per minute.
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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:
Ice cubes with salt melt faster. When you add salt, it dissolves in the water of the ice cube. The freezing temperature of salt water is 32 degrees Fahrenheit lower than that of fresh water.
Probability
Degree
Expected occurrence
Identification
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Answer:
Probability
Explanation:
Final answer:
The frequency of an event is a measure of how often the event occurs within a given time period.
Explanation:
The frequency of an eventrefers to how often the event occurs within a given time period. It is a measure of the rate at which the event happens. Frequency can be calculated by dividing the number of times the event occurs by the total time period. Probability, on the other hand, is a measure of the likelihood of an event happening.
For example, if a student attends class 4 days a week, the frequency of attending class is 4/7 or 0.57. Probability, on the other hand, refers to the likelihood of an event occurring. It is a measure of the chances of the event happening. Probability is expressed as a number between 0 and 1, where 0 means the event will not happen and 1 means the event will definitely happen.
Learn more about Frequency of an event here:
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2. Cr
3. Mg
4. Pb
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Answer : The correct option is, (2) Cr (Chromium)
Explanation :
The reactivity series of metal are arranged of the reactivity from the highest to the lowest. Reactivity series is used to determine the products of the single displacement reactions. In the single displacement reaction, the most reactive metal displaces the least reactive metal.
From the given reactivity series we conclude that there are two metal (Mg and Cr) are more reactive metal than the Ni and there are two metal (Pb and Cr) are less reactive metal than the Zn. So, the Cr (Chromium) is the metal which is more active than Ni and less active than Zn.
Hence, the correct option is, (2) Cr
Answers
Answer: The correct answer is Option D.
Explanation:
Atomic radius is defined as the total distance from the nucleus to outermost orbital of the electron.
As moving from top to bottom, new shell is added around the nucleus. The outermost orbital gets far away from the nucleus and hence, the distance between the nucleus and outermost orbital gets increased.
Thus, the atomic radii of the elements increases as we move from top to bottom in a group.
Hence, the correct answer is Option D.