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NNADVOKAT [17]
3 years ago
7

When silver coins are found in ancient shipwrecks, they are coated with a black crust. What question could you ask to help you d

ecide whether the silver underwent a chemical change or a physical change?
Chemistry
1 answer:
Aleks04 [339]3 years ago
5 0
You could ask whether the black crust is a new substance formed from silver underwent a chemical change because a chemical change produces a new substance.
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Vamos para playa oh te rajas lol
Anuta_ua [19.1K]

Answer:

let's go to the beach or u will relax lol

6 0
3 years ago
PLS HELP
serious [3.7K]

4. True

5. The amplitude of the ripples decreases as the circumference of the circle increases.

<h3>What is a wave?</h3>

A wave is a disturbance that moves energy from one place to another.

Radio waves, gamma-rays, visible light, and all the other parts of the electromagnetic spectrum are electromagnetic radiation. Electromagnetic radiation can be described in terms of a stream of mass-less particles, called photons, each travelling in a wave-like pattern at the speed of light. Hence, the statement is true.

As the disturbance moves outwards the energy it carries is spread over a larger and larger region called the wavefront. For example, the ripples in the water lie in a circle with an ever-increasing circumference. The amplitude of the ripples decreases as the circumference of the circle increases.

Learn more about the Electromagnetic wave here:

brainly.com/question/3101711

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6 0
2 years ago
The change in enthalpy that occurs in the process of converting reactants to products in a chemical reaction is called the _____
zheka24 [161]

Answer:

∆H or Enthalpy of the reaction

Explanation:

If ∆H is +ve

  • Reaction is exothermic
  • Example:-Combustion, mixing sodium/potassium in water

If ∆H is -ve

  • Reaction is endothermic
  • Ex:-Melting of ice
6 0
2 years ago
Read 2 more answers
Which direction are sediments deposited?
shutvik [7]
C. horizontal
please rank brainliest if possible :)
8 0
3 years ago
Which of the following is NOT a way carbon dioxide returns to the atmosphere?
yawa3891 [41]

Answer:

emissions by factories is the answer

Explanation:

Factories produce air pollution which is polluted air, the other options

decay of organisms, photosynthesis (convert light energy into chemical energy - and returns CO2), and cellular respiration are all of the ways carbon dioxide returns to the atmosphere.

Hope this helped! Have a nice day, be safe and healthy :)

4 0
3 years ago
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