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Rina8888 [55]
2 years ago
11

John and Lisa collected a sample of ocean water and placed it in a jar. Within a couple of days, the water had evaporated and sa

lt was visible at the bottom of the jar.
This is an example of a
O A solute being dissolved.
B
new substance being formed.
O
С
chemical change
o
D
physical change
Chemistry
1 answer:
omeli [17]2 years ago
8 0

THE Answer is Physical Change.

Explanation:

THANKS BB

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Draw a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride).
Brilliant_brown [7]

Answer:

Zinc + Hydrochloric Acid Zinc Chloride and Hydrogen Gas

Zn + 2HCI - ZnCl2 + H2

Explanation:

Be sure to label your model to clearly show how you are representing the atoms

3 0
2 years ago
How much ch2o is needed to prepare 445 ml of a 2.65 m solution of ch2o?
worty [1.4K]

Answer: 35.4 grams

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

Molarity=\frac{n\times 1000}{V_s}

where,

Molality = 2.65

n= moles of solute =?

 V_s = volume of solution in ml = 445 ml

Putting in the values we get:

2.65=\frac{n\times 1000}{445ml}

n=1.18

Mass of solute in g=moles\times {\text {molar mass}}=1.18mol\times 30.02g/mol=35.4g

Thus 35.4 grams of CH_2O is needed to prepare 445 ml of a 2.65 m solution of CH_2O.

8 0
2 years ago
Put the following in order of size starting with the smallest and ending with the largest.
malfutka [58]

Answer:

moon, planet, sun, solar system, galaxy, Universe

Explanation:

I am not fully sure but I think this is right

but I apologize if it is wrong

5 0
3 years ago
Which of the following is an anion?Al3+ Mg2+ O2– H Save
JulijaS [17]
An anion is an ion with a negative charge. The minus sign, when attached to the end of an ionic compound, indicates that this has a negative charge, while a plus sign indicates a positive charge. 

O2- is the only compound listed that satisfied this. It is the anion.
Answer is 02-
5 0
3 years ago
The _________________ are either elements or compounds which are present prior to a chemical reaction.
mr Goodwill [35]
Reactants would be the missing word in the sentence because they make up the products in a chemical reaction
3 0
2 years ago
Read 2 more answers
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