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Sphinxa [80]
3 years ago
9

What is an exothermic chemical reaction? A. It is a reaction that converts matter to heat. B. It is a reaction that requires hea

t to proceed. C. It is a reaction that draws heat from its surroundings. D. It is a reaction that releases heat to its surroundings.
Physics
2 answers:
alukav5142 [94]3 years ago
4 0

Answer: The answer is

D. It is a reaction that releases heat to its surroundings.

Explanation:

An exothermic reaction is a reaction in which the overall standard enthalpy change to negative. And  Exothermic reactions usually release heat and entail the replacement of weak bonds with stronger ones.

nordsb [41]3 years ago
3 0

it is D exo means realease

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What is the current in a 160V circuit if the resistance is 2Ω? V= I= R =
sveta [45]

Answer:

80 amperes

Explanation:

Current in the circuit = ?

Voltage in the circuit = 160 Volts

Resistance = 2 Ω

Voltage = Current x Resistance

V = IR

160V = I x 2 Ω

I = 160V / 2 Ω

I = 80 Amperes

Therefore the current in the circuit is 80 amperes :)

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7 0
3 years ago
A. Calculate the approximate number of atoms in a bacterium. Assume that the average mass of an atom in the bacterium is ten tim
ludmilkaskok [199]

Answer:

a. Approximate umber of atoms = 10¹¹

b. number of atoms = 50 atoms thick

Note: The question is missing some parts. The complete question is as follows; Calculate the approximate number of atoms in a bacterium. Assume that the average mass of an atom in the bacterium is ten times the mass of a hydrogen atom. (Hint: The mass of a hydrogen atom is on the order of 1×10⁻²⁷ kg and the mass of a bacterium is on the order of 1×10⁻¹⁵ kg)

Explanation:

a. Approximate umber of atoms = mass of bacterium / 10 * mass of hydrogen

number of atoms = 10⁻⁵/ 10 × 10⁻²⁷

number of atoms = 10¹¹ atoms

b. The cell membrane is 10-8 m thick while the hydrogen atom has a diameter of 10-10  m.

The number of atoms in the cell membrane = d1 / 2 × d2

where d1 = diameter of cell membrane; d2 = diameter of hydrogen atom

The number of atoms in the cell membrane = 10⁻ / 2 × 10⁻¹⁰ = 50 atoms

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3 years ago
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3 years ago
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