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-BARSIC- [3]
3 years ago
6

The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories). If one

were to burn a serving of cereal, the amount of heat given off would be sufficient to raise the temperature of 1 kg of water how many degrees Celsius?
Chemistry
2 answers:
jarptica [38.1K]3 years ago
4 0

Answer:

Δt = 90.00 °C

Explanation:

The nutritional information on a cereal box shows that one serving of dry cereal has 90 calories (actually kilocalories) so

The amount of heat is 90.00 Kcal

Q= 90000 cal

The mass of water is m = 1 kg = 1000 g  

There is a formula that relates the amount of heat, the mass and the temperature variation :

Q = C.m.Δt

Where Q is the amount of heat, m is the mass,Δt is the temperature variation and finally C is the Specific heat (in this case C=Water specific heat)

C(Water) = 1.00 (cal/g.°C)

Q = C.m.Δt

90000 cal = 1.00 (cal/g.°C). 1000 g .Δt

Solving, Δt = 90.00 °C

Be aware of having all in congruent units. Also, we are supposing that water is in solid state.Otherwise, C(Water) ≠ 1.00 (cal/g.°C)

bogdanovich [222]3 years ago
3 0

Answer:

90 degrees Celsius

Explanation:

A calorie is the amount of energy needed to raise the temperature of 1 gram of water 1 degree Celsius.

A kilocalorie is 1000 calories

90kilocalories = 90 x 1000 = 90000 calories

1 kg = 1000 grams

temperature = calories/ grams = 90000/1000 = 90 degrees Celsius

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Which of the following rules should you follow to balance chemical equations?
Firdavs [7]

Answer:

c. add coefficients as needed

Explanation:

A chemical equation is defined as the equation that shows changes in a chemical reaction. A chemical equation consist of reactant and product, reactant is at left side of the arrow and product is at right side of the arrow.

Reactant => Product

While balancing a chemical equation, the basic rule is to balance the coefficient as required. Coefficient represents the number of molecules and is used at front of a chemical symbol. Change in coefficient helps balance the number of atoms or molecules of the substances on both the sides of the arrow.

Subscripts are never allowed to change because it can change the chemical involved in the reaction.

Hence, the correct answer is "c. add coefficients as needed".

3 0
2 years ago
The number of neutrons in an atom can be found by subtracting the atomic number from the what?
Svetradugi [14.3K]

Answer:

This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu. Isotopes of the same element will have the same atomic number but different mass numbers.

Explanation:

3 0
3 years ago
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Differences in air pressure drive the global wind system on earth. Which term describes polar winds that blow from east to west?
marshall27 [118]

Answer: Polar Easterlies

Explanation: Winds flow from high pressure areas to low pressure areas. They originate in the north and south pole creating high pressure zones which generates an outflow. This outflow is then directed from east to west and hence the term used to describe these winds is Polar Easterlies.

6 0
3 years ago
This transition metal is in group 12 and has less than 34 protons
slava [35]

Zinc (Zn) has less than 34 protons, 30 to be exact, and is a transition metal in Group 12. Note: it is also called a "post-transition metal."

4 0
2 years ago
Which of the following has a mass of 10.0 g?
Serjik [45]

Answer:

a.  0.119mol Kr

Explanation:

To solve this problem, we must understand that;

     Mass  = number of moles x molar mass

Molar mass of Kr  = 83.3g/mol

                        Ar = 40g/mol

                        He = 4g/mol

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a0.119 mol Kr               mass  = 0.119 x 83.3 = 9.9g

b 0.400 mol Ar             mass  = 0.4 x 40  = 16g

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d 2.02 mol Ne              mass  = 2.02 x 20.18  = 40.8

Krypton is the answer

5 0
2 years ago
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