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Lyrx [107]
3 years ago
11

When bridges are built, special joints must be used because the material of the bridge shrinks, and without these joints, the ma

terial would break. Which of the following properties is described here? A.
Chemistry
1 answer:
marysya [2.9K]3 years ago
6 0

Expansion

Explanation:

Expansion is the change is size of a body with increasing temperature and tension.

Bridges are built of iron. Iron thermally expands in the presence of increased temperature during the day. The length of the iron will increase by simple fractions. At night, when temperature drops, the bar returns back to its initial position.

  • The allowance for expansion of the metal is made in order to prevent tension within the structure.
  • Not doing this will cause the material to break since there is no free space for the bar to change shape.

Learn more:

Expansion in gases brainly.com/question/9979757

#learnwithBrainly

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The limiting reactant, O2, can form up to 2.7 mol Al2O3. What mass of Al2O3 forms?
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Answer:

280 g Al₂O₃

Explanation:

To find the mass, you need to multiply the given value by the molar mass. This will cause the conversion because the molar mass exists as a ratio; technically, the ratio states that there are 101.96 grams per every 1 mole Al₂O₃. It is important to arrange the ratio in a way that allows for the cancellation of units. In this case, the desired unit (grams) should be in the numerator. The final answer should have 2 sig figs to reflect the given value (2.7 mol).

Molar Mass (Al₂O₃): 101.96 g/mol

2.7 moles Al₂O₃          101.96 g
------------------------  x  -------------------  = 275 g Al₂O₃  = 280 g Al₂O₃
                                     1 mole

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Explanation:

ATP -

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The correct term is nucleic acid.

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