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hjlf
3 years ago
7

For the following word equations, write it as a chemical equation, then balance it.

Chemistry
1 answer:
Lorico [155]3 years ago
7 0

4K+O2-----------2K2O

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Which statement correctly describes the location and charge of the electrons in an atom?
maxonik [38]

Answer:

D

Explanation:

The electrons revolve around the nucleus and they contain negative charge

3 0
3 years ago
A 80.0 g piece of metal at 88.0°C is placed in 125 g of water at 20.0°C contained in a calorimeter. The metal and water come to
grandymaker [24]

Answer:

The specific heat of the metal is 0.485 J/g°C

Explanation:

<u>Step 1:</u> Data given

Mass of the piece of metal = 80.0 grams

Mass of the water = 125 grams

Initial temperature of the metal = 88.0 °C

Initial temperature of water =20.0 °C

Final temperature = 24.7 °C

pecific heat of water is 4.18 J/g*°C

<u>Step 2:</u> Calculate specific heat of the metal

Qgained = -Qlost

Q =m*c*ΔT

Qwater = - Qmetal

m(water)*c(water)*ΔT(water) = -m(metal)*c(metal)*ΔT(metal)

with mass of water = 125 grams

with c( water) = 4.18 J/g°C

with ΔT(water) = T2-T1 = 24.7 - 20 = 4.7°C

with mass of metal = 80.0 grams

with c(metal) = TO BE DETERMINED

with ΔT(metal) = 24.7 - 88.0 = -63.3 °C

125*4.18*4.7 = -80 * C(metal) * -63.3

2455.75 = -80 * C(metal) * -63.3

C(metal) = 2455.75 / (-80*-63.3)

C(metal) = 0.485 J/g°C

The specific heat of the metal is 0.485 J/g°C

3 0
3 years ago
What is the volume when the density is 7.83g/ml and 19.6 grams?
insens350 [35]
To fine volume, you have to divide the mass by the density of the substance. in this, you’ll do 19.6/7.83=2.50
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3 years ago
Which of the following chemical equations represents an oxidation-reduction reaction?
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C. Represents an oxidation-reduction reaction
7 0
3 years ago
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