When a chemical reaction occurs blank happens

Answers

Answer 1

Answer:

Answer:

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

Explanation:

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The specific spatial arrangement of amino acid residues that are close to each other in the polypeptide chain is called______the structure of a protein.a. primary.b. secondary.c. tertiary.d. quaternary .
1. If a solution of sodium chloride has 22.3 g ofNaCl, and a volume of 2.00 L, what is its molarity?
Suppose a scientist made a claim that all spontaneous reactions are exothermic. Whic of the following would provide the strongest challenge to their claim? Suppose a scientist made a claim that all spontaneous reactions are exothermic. Which of the following would provide the strongest challenge to their claim? a. An exothermic reaction which is not spontaneous b. An endothermic reaction that only proceeds when coupled to an exothermic reaction c. An endothermic reaction that only proceeds when a catalytst is present d. An endothermic reaction which is not spontaneous e. All of the above

270kJ are needed to keep a 75 watt light bulb burning for 1 hour. How many kilocalories are needed to burn this light bulb for 3 hours?

Answers

Answer:

For 1 hour 75w light bulb requires 270 kj for burning

for 3 hours 75 w light bulb requires 270*3 = 810kj for burning

Explanation:

Why is predicting our future oil supply controversial and involves some uncertainty?I just need some explaining.

Answers

Natural resources such as oil that are as yet undiscovered are very difficult to predict or estimate; this creates huge uncertainty and large errors in even the most rigorous scientific efforts to predict future supply. Changes in oil drilling and discovery technology can and will completely change the eventual results in the search for undiscovered resources. The controversy lies in the desire to eliminate oil from the world's energy mix in order to prevent a perceived but uncertain risk of global warming and the desire to encourage the use of alternative energy in order to reduce that risk, even though so far no alternative energy source other than natural gas, coal, and nuclear energy has been able to compete with oil economically.

The Problem with predicting things like our natural supply of oil can be picked out to a LOT of different variables. For starters, we find a lot of oil in a myriad of different places. The frequency in which we find this oil could theoretically be linked to a computer and predicted like Stocks. But then again, since the rate changes almost as much as the finding sites, You can easily be slapped aside by prehistoric biology and geology. The other problem with predicting our supply is often controversial; "How much do we use" well, you have to look at individual countries or the entire planet. And that alone is a lot of work. Imagine knocking on your neighbor's door and asking exactly how much hot water he uses.... Every day.... For a year! Pretty creepy right? Not to mention intrusive. But the internet has some of these things, So lets say you managed to find the frequency of oil findings globally, and the rate of use for these areas. Well now you have even more problems. Because there are many different people looking for oil. And when they find it. They sell it. Or they sue eachother over who found it first. Because underground supplies are huge at times. Often companies will be drilling the same one. To get an exact count from one company you would need to track all of the oil possessed by them and the buyers, which is paperwork. Which is Highly variable depending on who you are counting from. Without Tainting your next variable. "Current processed supply." ie. The stuff already out of the ground. If you have got all of that counted and punched into the smartest computer you can find. Then you still have some data to collect. Because the numbers are always changing. And everyone uses a different amount every day. This alone can stop any predictions cold for obvious. Reasons. So in conclusion, There literally is a large amount of Static variables and a few constant variables to consider when predicting future supply. This is why simply internet searching these things often gives numbers that are highly different from eachother. Being both controversial and uncertain.

Suppose that you are a scientist who studies climate changes. While examining the rings of tree trunks, you notice several very large tree rings. What can you conclude about the climate during those years?

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Answer:

The climate was wet and cold

Explanation:

Answer:

The large tree rings allow you to conclude that the climate was either very warm or wet during those growing seasons, because greater than normal growth occurred.

Explanation: It is the edge sample response

In a climatological sense, dryness is a function of both annual rainfall and ________.This a geology question.

Answers

Answer:

In a climatological sense, dryness is a function of both annual rainfall and evaporation

A buffer solution is 0.413 M in HF and 0.237 M in KF. If Ka for HF is 7.2×10-4, what is the pH of this buffer solution?

Answers

Answer:

2.90

Explanation:

Any buffer system can be described with the reaction:

$HA~->~H^+~+~A^-$

Where $HA$ is the acid and $A^-$ is the base. Additionally, the calculation of the pH of any buffer system can be made with the Henderson-Hasselbach equation:

$pH=pKa~+~Log([A^-])/([HA])$

With all this in mind, we can write the reaction for our buffer system:

$HF~->~H^+~+~F^-$

In this case, the acid is $HF$ with a concentration of 0.413 M and the base is $F^-$ with a concentration of 0.237 M. We can calculate the pKa value if we do the "-Log Ka", so:

$pKa~=~-Log(7.2X10^-^4)=~3.14$

Now, we can plug the values into the Henderson-Hasselbach

$pH=~3.14~+~Log(([0.237~M])/([0.413~M]))~=~2.90$

The pH value would be 2.90

I hope it helps!

The most common carbonate rock is A) dolomite. B) halite. 35) C) limestone. D) calcite.

Answers

Answer:

The correct option is : C) limestone.

Explanation:

Carbonate rocks are a type of sedimentary rocks. The carbonate rocks are composed of carbonate minerals. The carbonate minerals are the minerals containing carbonate ion (CO₃²⁻).

The most common type of carbonate rock is limestone. Limestone is composed of the minerals calcite and aragonite, which have a different crystal form of calcium carbonate.

Therefore, Limestone is the most common type of carbonate rock.

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