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2 years ago

11

Look at the potential energy diagram for a chemical reaction. Which statement correctly describes the energy changes that occur

in the forward reaction?

1 answer:

lukranit [14]2 years ago

8 0

The activation energy is 10 kJ and the reaction is exothermic.

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A copper wire is 1.6 m long and its diameter is 1.1 mm. If the wire hangs vertically, how much weight (in N) must be added to it

qaws [65]

Answer:

Weight required = 194.51 N

Explanation:

The elongation is given by

$\Delta L=\frac{PL}{AE}$

Length , L= 1.6 m

Diameter, d = 1.1 mm

Area

$A=\frac{\pi d^2}{4}=\frac{\pi \times (1.1\times 10^{-3})^2}{4}=9.50\times 10^{-7}m^2$

Change in length, ΔL = 2.8 mm = 0.0028 m

Young's modulus of copper, E = 117 GPa = 117 x 10⁹ Pa

Substituting,

$\Delta L=\frac{PL}{AE}\\\\0.0028=\frac{P\times 1.6}{9.50\times 10^{-7}\times 117\times 10^9}\\\\P=194.51N$

Weight required = 194.51 N

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3 years ago

Newton's first law of motion is also called the law of acceleration true or false

kotykmax [81]

False. Newton first is also called the law of intertia

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3 years ago

Is the chemical reaction shown balanced? Why or why not? 6CO2 + 6H2O → C6H12O6 + O2

alisha [4.7K]

Answer: Not balanced

Explanation: In order to balance this equation the coefficients are the following:

6 CO2 + 6H2O = > C6H12O6 + 6O2

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2 years ago

A length of wire is cut into five equal pieces. if each piece has a resistance of 0.45 ω, what was the resistance of the origina

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