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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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A compound consisting of b, n, and h undergoes elemental analysis. the % composition by mass is found to be 40.28% b, 52.20% n,
svp [43]
To compute for the empirical formula, assume there is 100 grams of the compound. That means there is 40.28 g B, 52.2 g N and 7.53 g H. Convert the mass into moles using their molar masses:

40.28 g B * 1 mol/10.811 g = 3.725835 mol B
52.2 g N * 1 mol/14 g = 3.72857 mol N
7.53 g H * 1 mol/1 g = 7.53 mol H

Divide all the moles by the smallest amount which is 3.725835 mol.

B: 3.725835/3.725835 = 1
N: 3.72857/3.725835 = 1
H: 7.53/3.725835 = 2

Therefore, the empirical formula is BNH₂.
8 0
4 years ago
Write the general electron configuration of a transition element(a) in Period 5;
atroni [7]

Electron configurations of  transition elements in Period 5:

Y     Yttrium  [Kr] 4d1 5s2

Zr Zirconium        [Kr] 4d2 5s2

Nb Niobium  [Kr] 4d4 5s1 (*)

Mo Molybdenum [Kr] 4d5 5s1 (*)

Tc Technetium [Kr] 4d5 5s2

Ru Ruthenium [Kr] 4d7 5s1 (*)

Rh Rhodium  [Kr] 4d8 5s1 (*)

Pd Palladium [Kr] 4d10 (*)

Ag Silver  [Kr] 4d10 5s1 (*)

Cd Cadmium  [Kr] 4d10 5s2

What are transition elements?

  • The transition elements or transition metals occupy the short columns in the center of the periodic table, between Group 2A and Group 3A.  
  • They are sometimes called the d-block elements, since in this region the d-orbitals are being filled in, and are also referred to as B-group elements since in most numbering systems of the columns on the periodic table the numerals of these groups are followed by the letter B.

What are period 5 transition elements?

The period 5 transition metals are yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), and cadmium (Cd).

To know more about transition elements, refer:

brainly.com/question/2426896

#SPJ4

7 0
2 years ago
Is the tendency of copper to turn green when exposed to air chemical or physical property?
Zielflug [23.3K]
<u>Chemical</u>. The copper atoms form new chemical bonds with atoms in the air.
8 0
3 years ago
Linolenic acid (C18H30O2 - M.W. = 278.42 g/mol) reacts with hydrogen gas according to the equation: C18H30O2 + 3H2 (g) → C18H36O
Ludmilka [50]

Answer:

2.53 L is the volume of H₂ needed

Explanation:

The reaction is: C₁₈H₃₀O₂ + 3H₂ → C₁₈H₃₆O₂

By the way we can say, that 1 mol of linolenic acid reacts with 3 moles of oxygen in order to produce, 1 mol of stearic acid.

By stoichiometry, ratio is 1:3

Let's convert the mass of the linolenic acid to moles:

10.5 g . 1 mol / 278.42 g  = 0.0377 moles

We apply a rule of three:

1 mol of linolenic acid needs 3 moles of H₂ to react

Then, 0.0377 moles will react with (0.0377 . 3 )/1 = 0.113 moles of hydrogen

We apply the Ideal Gases Law to find out the volume (condition of measure are STP) → P . V = n . R . T → V = ( n . R .T ) / P

V = (0.113 mol . 0.082 L.atm/mol.K . 273.15K) 1 atm = 2.53 L

4 0
3 years ago
Is iron a substance or mixture ?
sattari [20]
Iron is a substance.
3 0
3 years ago
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