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Gnom [1K]
3 years ago
8

A student lives in a place that receives lots of snow and ice during the winter. The student has observed that the highway depar

tment spreads salt on the road after a snowfall. Which of the following correctly explains why the highway department uses salt on the roads?
A. Salt lowers the freezing point of water, which makes the melted snow on the road less likely to form ice.
B. Salt raises the freezing point of water, which makes the melted snow on the road less likely to form ice.
C. Salt raises the vapor pressure of water, which makes the melted snow more likely to evaporate before it freezes.
D. Salt lowers the osmotic pressure of water, which makes the melted snow more likely to be absorbed into the ground before it freezes.
Chemistry
2 answers:
34kurt3 years ago
6 0

The answer is A. Have a nice day!

Harlamova29_29 [7]3 years ago
4 0
<span>A. Salt lowers the freezing point of water, which makes the melted snow on the road less likely to form ice.</span>
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How many ions are present in 75.0g of magnesium sulfate
Ostrovityanka [42]

Answer:

7.5×10²³ ions

Explanation:

Given data:

Mass of magnesium sulfate = 75.0 g

Number of ions = ?

Solution:

Number of moles of magnesium sulfate:

Number of moles = mass/molar mass

Number of moles = 75.0 g/ 120.36 g/mol

Number of moles = 0.623 mol

Magnesium sulfate formula: MgSO₄

Number of moles of ions in 1 mole of MgSO₄ = 2 mol (Mg²⁺ and SO₄²⁻)

Number of moles of ion in 0.623 moles of MgSO₄:

2 mole ×0.623 = 1.246 mol

Number of ions:

1 mole contain 6.022×10²³ ions

1.246 mol × 6.022×10²³ ions / 1mol

7.5×10²³ ions

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Alenkasestr [34]

Answer:

C. have specific jobs

Explanation:

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A group of cells that performs a specific job is called tissues.

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gladu [14]

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