A 0.300 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/g 0C, what Is the change of the copper's temperature?
Answers
Answer:
X=600 degrees celsius
Explanation:
We can evaluate by using the equation ==> Q=m(c)(delta T)
-We know the mass is 0.3 g
-Q= 66,300 J
-C= 390 j/g 0C
-Therefore, we need to solve for delta T (which will be represented by x)
Q= mct
66,300 J= 0.3 g (390 J/g 0C) (t)
The unit of measurement (g-grams) can be crossed out on the left side of our expression.
66,300 J=0.3(390 J 0C) (t)
-If we convert into a proportional relationship:
66,300 J 117 J/0C x
------------ = -----------
117 J/0C 117 J/0C
-Joules on both sides can be crossed off
*117 J/0C came from the product in terms of 0.3(390 J 0C)
*If we find the quotient of 66,300 J and 117 J/0C, we get 566.6 repeating
-You may keep the answer as it is, although for simplicity reasons, we can round to the nearest hundred.
-Therefore, x=600.
-----Remember, x represented the delta t in our equation. (I made notice of that when evaluating).
Hope this helps! :)
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Answers
Answer:
The answer is B. Only synthesis.
Explanation:
Synthesis reactions are those in which two substances combine, giving rise to new substances. Breakdown of chemical bonds in reagents and formation of other bonds occurs, giving rise to new species.
A combustion is any reaction created between the combustible material and the oxidizer. Oxygen has the ability to combine with various elements to produce oxides. There are oxidations that are extremely slow, but when it is fast it is called combustion. That is why the oxidizer is oxygen, and the fuel is usually hydrocarbons (organic compounds made up of only carbon and hydrogen atoms). These usually go into combustion with ease.
In this case it is a synthesis, where two reagents, and
, are combined to form a product,
. It is not a combustion because despite having
there is no hydrocarbon.
So the answer is
A. Both synthesis and combustion.
b. conservation of matter.
c. atomic disintegration.
d. definite proportions.
Answers
your answer is b. conservation of matter.
i just took the test
Answer: b. Conservation of matter.
Explanation:
Law of conservation of matter states that matter can neither be created nor destroyed by means of chemical reaction but can be changed from one form to another.
It means that the amount of matter remains the same after a chemical change.
True or False
Answers
Answer: False
Explanation: Endothermic means it absorbs heat energy.
yes
no
Answers
Ionic bonds are formed by the differences in the electronegativities of the elements. Yes, sodium, and fluorine will form ionic bonds. Thus, option A is correct.
What are ionic bonds?
Ionic bonds are the category of chemical bonds that are formed by the complete transfer of the electron from one atom to another resulting in the formation of the cation and the anion. This sharing occurs through the difference in electronegativity.
If the electronegativity difference is more than 1.5 to 1.7 then, the electron sharing occurs by the virtue of the valence shell.
Given,
Electronegativity of fluorine (F) = 3.98
Electronegativity of sodium (Na) = 0.93
The differences are calculated as:
= Electronegativity of fluorine - Electronegativity of sodium
= 3.98 - 0.93
= 3.05
As 3.05 > 1.7 it will form the ionic bond.
Therefore, yes sodium and fluorine form an ionic bond.
Learn more about the ionic bonds, here:
#SPJ2
Answers
Answer:
sodium
Explanation:
B) Gold has a lower activity than hydrogen and cannot replace it.
C) The reaction cannot occur because water is a reactant.
D) The reaction proceeds too slowly to create products.
2. Which of the following is the balanced form of the equation C2H6 + O2 --> CO2 + H2O?
answer choices are attached A,B,C,D top to bottom
3. The equation 2NaNO3 + CaCl2 ---> 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation?
A) one
B) two
C) four
D) six
4. All single-displacement reactions can be classified as another type of reaction as well. What type of reaction is that?
A) combustion
B) redox
C) synthesis
D) decomposition
5. If ions change places and a gas is formed, then what type of reaction is indicated?
A) double-displacement
B) synthesis
C) decomposition
D) single-displacement
Answers
The positive charge in water is provided by hydrogen, and gold provides the same charge. However, gold is not more reactive than hydrogen so it can not replace it in the compound.
2. In order to balance the equation, you must sure there are equal moles of each element on the left and right side of the equation:
2C₂H₆ + 7O₂ → 4CO₂ + ₆H₂O
3. The number of moles of sodium atoms on the left of the equation must be equal to the number of moles of sodium atoms on the right, as per the law of conservation of mass. The answer is B.
4. C.
A synthesis reaction usually results from single displacement because some element or compound is produced in its pure form
5. B.
The gas being produced is being synthesized.