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nevsk [136]
2 years ago
7

How might you measure the amount of energy in the world's largest rice cake?

Chemistry
1 answer:
enot [183]2 years ago
7 0

Answer:

kindly check the explanation section.

Explanation:

The largest rice cake in the world was discovered in the year 2007 in South Korea with a weight of 8,113 lb. The amount of energy in the World's largest rice cake can be determined by using the formula below:

The energy in kJ =[ mass of water] x [specific heat capacity of water] x [change in temperature].

In order to determine experimentally in the laboratory and make use of the formula above. The first thing[STEP ONE] to do is to measure the mass of the rice cake and record it.

STEP TWO: measure a known amount of water in a boiling tube.  

STEP THREE: Heat the rice cake until it catches fire with a Bunsen flame.

STEP FOUR: Use the rice cake that has already caught fire in step three above and use it to heat the water in step two until the fire burns out.

Repeat the process for three to four times and record your observations under the following headings;

[1]. Mass of cake, [2]. Temperature  of water  before  burning, [3]. Temperature  of water after  burning and Temperature  increase per  gram of the rice cake.

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What is the oxidation state of an individual bromine atom in kbro2?
san4es73 [151]
The oxidation state of potassium ion K = +1
The oxidation state of oxygen ion O = -2
So, the oxidation state of O2 is = -2 x 2 = -4
Since, KBrO2 is neutral so, 
(+1) + (x) + (-4) = Zero 
-3 + X = Zero
So, X = +3 
The oxidation state of  individual bromine atom in KBrO2 is +3 
6 0
2 years ago
Compute 4.659×104−2.14×104. Round the answer appropriately.
pentagon [3]

Answer: 25,200.


Explanation:


1) Given: 4.659 × 10⁴ - 2.14 × 10⁴


2) You have to deal with significant figures.


Since, the powers are the same (10⁴) you can directly subtract the decimal numbers. But first analyze the significant figures and the number of decimal digits.


3) The number 4.659 × 10⁴ has four significant figures (4, 6, 5, and 9), while the number 2.14 × 10⁴ has three significan figures (2, 1, and 4).


4) When you add or subtract numbers with diferent amount of decimal digits, the result must show the same number of decimal digits as the term with the least number of decimal digits.


5) Before subtracting, you must round all the terms to the least number of decimal digits. So, since 2.14 has two decimal digits and 4.659 has three decimal digits, you shall round 4.659 to 4.66.


6) Now you subtract 4.66 - 2.14 = 2.52


7) Multiply by the power of 10: 2.52 × 10⁴ = 25,200. And that is the answer.

5 0
2 years ago
Read 2 more answers
Looking at the same nonmetal group on the periodic table, how does the reactivity of an element in period 2 compare to the react
Bas_tet [7]

Answer : Option B) The period 2 element would be more reactive because the attractive force of protons is stronger when electrons are attracted to a closer electron shell.

Explanation : The reactivity of the Periods decreases as we go from left to right across a period. The farther to the left and down the periodic chart we go, the easier it is for electrons to be donated or taken away, resulting in higher reactivities of the elements. The attractive force of the protons is found to be stronger when electrons are found to be attracted to a closer electron shell.

4 0
2 years ago
Read 2 more answers
Complete the following sentence: The cathode in a voltaic cell is the electrode _____________.
Sergio [31]

Answer:

to which cations from the salt bridge migrate

Explanation:

A voltaic cell is an electrochemical cell that uses spontaneous redox reactions to generate electricity. It's composed of a cathode, an anode, and a salt bridge.

In cathode, the substance is gaining electrons, so it's reducing, in the anode, the substance is losing electrons, so it's oxidating. The flow of electrons is from the anode to the cathode.

The salt bridge is a bond between the cathode and the anode. When the redox reaction takes place, the substances produce its ions, so the solution is no more neutral. The salt bridge allows the solutions to become neutral and the redox reaction continues.

So, the cathode produces anions, which goes to the anode, and the anode produces cations, which goes to the cathode. Then, the cathode n a voltaic cell is the electrode to which cations from salt bridge migrate and where the reduction takes place.

7 0
2 years ago
What mass of lif is contained in 18.66 g of a 20.0% by mass solution of lif in water?
aev [14]
Answer is: mass of lithium fluoride is 3,732 grams.
m(solution) = 18,66 g.
ω(solution) = 20% = 20% ÷ 100% = 0,2.
m(LiF) = ?
ω(solution) = m(LiF) ÷ m(solution).
m(LiF) = ω(solution) · m(solution).
m(LiF) = 0,2 · 18,66 g.
m(LiF) = 3,732 g.
7 0
2 years ago
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