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3 years ago

Which pack has the greatest change in enthalpy, warm packs (such as hand warmers) or cold packs (such as an ice pack)?

1 answer:

3 0

Enthalpy is the change in energy. A cold pack will react endothermically and enthalpy will be positive and a heat pack will have negative enthalpy. You cannot determine which has more change in enthalpy unless you measure the temperature change. Eg. a heat pack went from 25c to 35c will have greater change in enthalpy then a cold pack going from 25 to 20c because the net temperature difference is greater

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Sam believes the rock is more denser than the pencil. He measured the mass of the rock to be 8.5 grams and volume to be 4.5mL. H

mezya [45]

Answer:

Rock

Explanation:

Let's calculate the density of each object:

Rock:

$Density = \frac{mass}{volume}=\frac{8.5\ g}{4.5\ mL}=1.9\ g/mL$

Pencil:

$Density = \frac{mass}{volume}=\frac{2.4\ g}{4.5\ mL}=0.53\ g/mL$

Therefore the rock is denser.

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3 years ago

A block of ice is cooled from -0.5 degrees Celsius to -10.1 degrees Celsius. Calculate the temperature change, delta T, in degre

ss7ja [257]

Delta T= T final - T initial
Tfinal= -101.1 °C
Tinitial= -0.5 °C
•Delta T = -101.1°C - (-0.5°C)
=100.6°C

Kelvin= °C + 273
= -100.6 + 273
= 172.4 Kelvin

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3 years ago

_______ prohibits and punishes certain conduct for the benefit of society.

Dmitrij [34]

Answer:

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Explanation:

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3 years ago

Write ionic formulas for the following compounds:

lakkis [162]

You may find the chemical formulas for the ionic compounds below.

Explanation:

a. Calcium Bromide - CaBr₂

b. Potassium Phosphide - K₃P

c. Iron (III) Oxide - Fe₂O₃

d. Iron (II) Oxide - FeO

e. Magnesium Hydroxide - Mg(OH)₂

f. Nickel (III) Sulfate - Ni₂(SO₄)₃

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chemical formulas of ionic compounds

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3 years ago

Compare and contrast heat waves and cold waves

poizon [28]

Ok they are both can formed by the same high pressure system . the heat waves are extended periods of above-normal temperatures . but the cold wave is an extended periods of below normal temperatures

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4 years ago