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mr Goodwill [35]
3 years ago
14

Which of the following best describes a mole as used in chemistry?

Chemistry
1 answer:
bazaltina [42]3 years ago
8 0

Answer: a very large number of objects

Explanation: Mole is the amount of objects and it has the usually Avogadro number of atoms, molecules, ions, etc in chemistry

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Explain how static energy is generated?<br>​
HACTEHA [7]

Question

explain how static energy is generated?

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Answer:

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Static electricity is the result of an imbalance between negative and positive charges in an object.  

These charges can build up on the surface of an object until they find a way to be released or discharged

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3 years ago
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Write the name of the first twenty elements with their symbols and their atomic number​
7nadin3 [17]

Answer:

1 Hydrogen H

2 Helium He

3 Lithium Li

4 Beryllium Be

5 Boron B

6 Carbon C

7 Nitrogen N

8 Oxygen O

9 Fluorine F

10 Neon Ne

11 Sodium Na

12 Magnesium Mg

13 Aluminium Al

14 Silicon Si

15 Phosphorus P

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17 Chlorine Cl

18 Argon Ar

19 Potassium K

20. calcium Ca

6 0
3 years ago
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Si a un resorte se le cuelga una masa de 800 g y se deforma 50 cm. ¿Cuál será el valor de su constante en N/m? (g = 9.81m/s2).
RSB [31]

Answer:

50cm

Explanation:

because thats the only thing i got

7 0
3 years ago
Students are attempting to demonstrate a reaction of liquid water separating into hydrogen and oxygen gases:
AlexFokin [52]

Answer:

B.

Explanation:

When water separates into hydrogen and oxygen gas, a decomposition reaction is taking place (one substance breaking apart or breaking down into two or more substances).

The law of conservation of mass tells us that mass is not created or destroyed during a chemical reaction, so the total mass will remain the same. This is supported by the diagram on the page, which shows that in the reactants, there are four hydrogen atoms and two oxygen atoms, and this amount is the same on the product side.

5 0
3 years ago
[BrO- ]initial is 0.56 M. 33 seconds later [BrO- ] is 0.14 M. What is the rate of change of [BrO- ] in M/s? (The brackets, [ ],
iVinArrow [24]

Answer:

0.013 M/s

Explanation:

Given data

  • Initial concentration of BrO⁻: 0.56 M
  • Final concentration of BrO⁻: 0.14 M
  • Time (t): 33 s

Since the final concentration of BrO⁻ is lower than the initial concentration of BrO⁻, BrO⁻ is dissapearing. The rate of dissapearance of BrO⁻ is:

rBrO⁻ = - Δ [BrO⁻] / t

rBrO⁻ = - (0.14 M - 0.56 M)/ 33 s

rBrO⁻ = 0.013 M/s

3 0
3 years ago
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