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kobusy [5.1K]
3 years ago
11

Ethan makes the table below to record his observations when mixing baking soda and vinegar in a beaker. Ethan claims that a chem

ical change has occurred. Which statement provides the BEST evidence to support his claim?

Chemistry
2 answers:
damaskus [11]3 years ago
7 0

The statement which best provides support for the fact that a chemical change has occurred is that many bubbles formed after mixing.

In a chemical change, new substances are formed and there is a recombination of the atoms in reactants as the products are being formed.

There are several cues that indicate that a chemical change has taken place such as;

  • Appearance of a solid in an aqueous phase reaction.
  • Evolution of gas
  • Sudden change in the temperature of the system
  • Change in the color of the system

In the particular instance in this question, when baking soda and vinegar were mixed together, a gas was evolved signifying that a chemical change has taken place.

Learn more: brainly.com/question/1161517

kozerog [31]3 years ago
3 0

Answer: a

Explanation:

Many bubbles formed after mixing.

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Explanation:

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3 years ago
The mass number of an element is equal to ____.
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4 years ago
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The following combinations are not allowed. If n and ml are correct, change the l value to create an allowable combination:
ololo11 [35]

The allowable combination for the atomic orbital is n=3, l=1 or 2, m_{l}=+1.

<h3>What are the three quantum numbers of an atomic orbital?</h3>

Three quantum numbers specify an atomic orbital:

- The principal quantum number, n, which is a positive integer, describes the relative size of the orbital and its distance from the nucleus.

- l is the angular momentum quantum number that is related to the shape of the orbital; l is an integer from 0 to n-1 (so n limits l ),

- $\boldsymbol{m}_{l}$ is the magnetic quantum number that prescribes the three-dimensional shape of the orbital around the nucleus; m_{l} values are integers from -l to =l(l limits ml)

For n = 3, l can have three values: 0, 1, and 2. Hence, the l value must be lower than 3. Because of m_{l}= +1, the l value must be higher than 0. Two l values are consistent with n and m_{l) values:

l= 1 or 2

Therefore, the allowable condition is n=7, l=1 or 2, m_{l}=+3.

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7 0
2 years ago
if you react 100g of ammonium chloride with excess calcium oxide, what Is the theoretical yeild (in grams) of ammonia? when you
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Answer:

31.78 grams

25.55%

Explanation:

The balanced reaction for ammonium chloride with calcium oxide will be:

2NH4Cl + Ca(OH)2 ---> CaCl2 + 2NH3 + 2H2O

The molecular weight for ammonium chloride(NH4Cl ) is 53.49g/mol, while the molecular weight for ammonium(NH3) is 17g/mol. The number of theoretical yield of ammonia from 100g of ammonium chloride will be:

100g / (53.49g/mol) * 2/2  * 17g/mol= 31.78 grams

If the actual yield is 8.12g, the percent yield will be: 8.12g/31.78g * 100% =25.55%

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3 years ago
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