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lukranit [14]
3 years ago
12

Natural disasters can cause both immediate and long-term issues. For example, flooding is an immediate threat with dangerous hig

h waters, and it can also cause an area to lose electricity for extended periods of time. To combat this, engineers have designed boxes that can keep food cool when there is no electricity for refrigeration. How should engineers design the boxes to be sure that the food within each box is not spoiled due to thermal energy transfer? A. The boxes must maximize thermal energy transfer to prevent thermal energy from transferring out of the boxes. B. The boxes must minimize thermal energy transfer to prevent thermal energy from transferring into the boxes. C. The boxes must minimize thermal energy transfer to prevent thermal energy from transferring out of the boxes. D. The boxes must maximize thermal energy transfer to prevent thermal energy from transferring into the boxes.
Chemistry
1 answer:
GalinKa [24]3 years ago
3 0

Answer:

. B. The boxes must minimize thermal energy transfer to prevent thermal energy from transferring into the boxes.

Explanation:

If a box is to remain cool, energy transfer into the box must be minimized and energy transfer out of the box must be maximized.

This implies that only a minimal amount of thermal energy can transfer into the box while the box looses heat rapidly. If a box is this designed, it is likely to remain cool.

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In the following reaction 2C6H6 + 15O2 12CO2 + 6H2O how many grams of oxygen will react with 10.47 grams of benzene (C6H6)?
IRINA_888 [86]
2 C_{6}H_{6}  +  15O_{2} ----->\ \textgreater \  12CO_{2}  +  6H_{2}O




mol of benzene =  \frac{mass}{Mr}
                                = \frac{10.47g}{(6 * 12) (6 * 1) g/mol}
                                = 0.134 mol

mol of oxygen: 
                 ratio of C_{6} H_{6} :  O_{2}
                 =  2 : 15
                 =  1 : 7.5

: . mol of O_{2} = 0.134mol * 7.5
                                         = 1.01 mol

Mass of Oxygen = mol * Mr
                           = 1.01 mol * (16*2) g/mol
                           = 32.22g 

Note: Mr is molar mass
8 0
3 years ago
A 0.15 m aqueous solution of a weak acid has a freezing point of -0.31 °C. What is the percent ionization of this weak acid at t
tensa zangetsu [6.8K]

Answer:

11%

Explanation:

1) Calculate van 't Hoff factor:

Δt = i Kf m

0.31 = i (1.86) (0.15)

i = 1.111

2) Calculate value for [H+]:

CCl3COOH ⇌ H+ + CCl3COO¯

total concentration of all ions in solution equals:

(1.11) (0.15) = 0.1665 m

This is a molality, but we will act as if it a molarity since we will assume the density of the solution is 1.00 g/cm3, which makes the molarity equal to the molality.

0.1665 = (0.15 − x) + x + x

x = 0.0165 M

3) Calculate the percent dissociation:

0.0165/ 0.15 = 11 %

4 0
4 years ago
The reaction below can be catalyzed by bromine (Br2). if you carried out such a reaction, which compound would you expect to fin
Vika [28.1K]

The answer is Br₂ since catalysts are regenerated at the end of a reaction.

3 0
3 years ago
What is the range of accuracy for food temperature?.
telo118 [61]

Answer:

+ 2 degrees Fahrenheit

Explanation:

7 0
2 years ago
What is the molecular formula if the empirical formula is CH20 and the molecular
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Answer:

The molecular formula of the given compound is C6H12O6, which is also called Glucose.

Explanation:

The molar mass of glucose is 180.18.

4 0
3 years ago
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