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RSB [31]
3 years ago
12

At 20 degrees Celsius, the density of air is 1.20 g/L. Nitrogen's density is 1.17 g/L. Oxygen's density is 1.33 g/L. Will balloo

ns filled with oxygen rise or sink in the air? Will balloons filled with nitrogen rise or sink in the air? Why? (3 points)
Chemistry
2 answers:
Anna [14]3 years ago
3 0
Balloons filled with oxygen will sink and balloons filled with nitrogen will also sink, this is because oxygen is more dense than air but nitrogen is only slightly less dense than air meaning it is not enough for the nitrogen to rise
Anna007 [38]3 years ago
3 0

Answer : When the balloons filled with oxygen then the balloons will sink.

When the balloons filled with nitrogen then the balloons will float.

Explanation :

As we given that:

The density of air = 1.20 g/L

The density of nitrogen = 1.17 g/L

The density of oxygen = 1.33 g/L

  • When the density of a substance will be greater than the density of medium then the substance will sink.
  • When the density of a substance will be lesser than the density of medium then the substance will float.

Here, substance is nitrogen and oxygen and medium is air.

As per question we conclude that,

The density of substance (oxygen) is greater than the density of medium (air). That means, when the balloons filled with oxygen then the balloons will sink.

The density of substance (nitrogen) is less than the density of medium (air). That means, when the balloons filled with nitrogen then the balloons will float.

Hence, the correct option is, It would float.

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How many significant figures are there in the following numbers: 10.78, 6.78, 0.78? If these were pH values, to how many signifi
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Answer:

10.78 → 4 significant figures, pH = 10.78 → [H⁺] = 1.66ₓ10⁻¹¹ M

6.78 → 3 significant figures, pH = 6.78 → [H⁺] = 1.66ₓ10⁻⁷ M

0.78 → 2 significant figures, pH = 0.78 → [H⁺] = 0.166 M

pH always can be expressed by at least 4 significant figures. The [H⁺], can be expressed by, at least 3 significant figures

Explanation:

Significant figures are the numbers of a measurement that have certainty plus a doubtful number (it is associated with the uncertainty in the measurement). For example, if we measure a paper with a ruler and the ruler measures up to centimeters we can say that the paper is 7.5 cm long, with which we know that the paper is 7 cm + 0.5 cm which we associate with uncertainty. In this case we talk about two significant figures. If the sheet measured 7.57 cm we would already be talking about a more precise measurement and in this case with 3 significant figures.

10.78 → 4 significant figures

6.78 → 3 significant figures

0.78 → 2 significant figures

To determine [H⁺], we apply 10^-pH

10⁻¹⁰°⁷⁸ = 1.66ₓ10⁻¹¹ M

10⁻⁶°⁷⁸ = 1.66ₓ10⁻⁷ M

10⁻⁰°⁷⁸ = 0.166 M

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Answer:

The answer to your question is below

Explanation:

Van der waals are attractive forces among molecules.

Hydrogen are attractive forces among molecules that have polar molecules with hydrogen.

Ionic is the bond between a metal and a nonmetal.

Covalent is the bond between 2 nonmetals.

Metallic is the bond among metals

Question

Graphite                      covalent

Magnesium                 metallic

Chloride                       covalent, van der waals

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Aluminum                     metallic

Argon                            van der waals

Water                            covalent, hydrogen

Methane.                      covalent  

6 0
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