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4 years ago

27.

1 answer:

6 0

27) mechanical weathering
28) overgrowth of algae that produce toxins
29) Weathering breaks down and loosens the surface minerals of rock so they can be transported away by agents of erosion such as water, wind and ice. There are two types of weathering:mechanical and chemical. Mechanical weathering is the disintegration of rock into smaller and smaller fragments.
30) I'M NOT SURE

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A hydrogen-filled balloon was ignited and 1.80 g of hydrogen reacted with 14.4 g of oxygen. part a how many grams of water vapor

Tamiku [17]

The reaction for combustion of hydrogen gas in the oxygen is as follows:

$2H_{2}(g)+O_{2}(g)\rightarrow 2H_{2}O(g)$

Here, oxygen is present in excess thus, hydrogen will be limiting reactant.

2 moles of hydrogen gives 2 moles of water vapor, thus, 1 mole will give 1 mole of water vapor.

The mass of hydrogen is 1.80 g and molar mass of $H_{2}$ is 2 g/mol converting mass into number of moles:

$n=\frac{m}{M}=\frac{1.80 g}{2 g/mol}=0.9 mol$

Thus, 0.9 mol of $H_{2}$ gives 0.9 mol of $H_{2}O(g)$ . Molar mass of $H_{2}O(g)$ is 18 g/mol, converting number of moles to mass,

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4 years ago

25.00 ml of heavy water at 20 degrees celcius was pipetted into a 37.234 g beaker. The final mass of the beaker was 64.859 g. Wh

Alborosie

density is mass over volume

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3 years ago

If 250 mL of 0.375 mol/L solution of potassium iodide was mixed with an excess of lead (II) nitrate, what mass of lead (II) iodi

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3 years ago

Name one element with similar chemical properties to lithium

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Answer:

Sodium

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3 years ago

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AlladinOne [14]

Answer:

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But fluorine has a higher atomic number, 9, than the carbon, 6. The atomic number represents how many protons there are in the nucleus, then there are more protons (positive charge) at the fluorine nucleus, and because of that, the attraction force between the nucleus and the valence electron is stronger in fluorine.

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