3 years ago

How can you relieve stress?

1 answer:

6 0

Some ways you can relieve stress include exercising, listening to music, reading a book, spending more time with those around you, and by eating healthier.

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What defines the mass number of an isotope?

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Answer:

Explanation:

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2 years ago

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The distance from San Francisco to Los Angeles is approximately 385 miles. 1609 m = 1 mile. How many kilometers is this? Do not

vitfil [10]

Answer:

619.465 kilometers

Explanation:

1609 m = 1 mile

so 385 miles is equal to 619465 meters (385 x 1609= 619465)

1000 meters = 1 km

so 619465 meters is 619.465 kilometers

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2 years ago

What is the term for the region where the north and south poles of atoms in a material will line up

hjlf

Answer:

ferromagnetic materials

Explanation:

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1. Part A: Use the periodic table to order the following Period 3 elements from smallest to largest atomic radius: aluminum (Al)

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Answer:

chlorine, aluminum, sulfur....i think im not sure

Explanation:

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2 years ago

Instant cold packs, often used to ice athletic injuries on the field, contain ammonium nitrate and water separated by a thin pla

Pavel [41]

Answer:

ΔH = +26.08 kJ/mol

Explanation:

The change in enthalpy (ΔH) is given in J/mol, and can be calculated for dissolution by the equation:

ΔH = m(water)*Cp*ΔT/n(solute)

The mass of water is the density multiplied by the volume

m = 1g/mL * 25.0mL = 25.0 g

The number of the moles is the mass divided by the molar mass. Knowing the molar masses of the elements:

N = 14 g/mol x 2 = 28

H = 1 g/mol x 4 = 4

O = 16 g/mol x 3 = 48

NH₄NO₃ = 80 g/mol

n = 1.25/80 = 0.015625 mol

So,

ΔH = 25*4.18*(25.8 - 21.9)/0.015625

ΔH = 26,083.2 J/mol

ΔH = +26.08 kJ/mol

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2 years ago