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timofeeve [1]
3 years ago
15

In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. When the water is exposed to

air, some of the calcium bicarbonate turns into calcium carbonate, which gets deposited on the ground. What makes this process a chemical change? A new substance is formed in this process, which is an important clue to chemical change. A change in state is observed in this process, which is an important clue to chemical change. This process involves separation of dissolved substances, which is an an important clue to chemical change. This process involves dissolving substances together, which is an an important clue to chemical change. This process involves breaking and reshaping of substances, which is an an important clue to chemical change. NextReset
Chemistry
2 answers:
Pepsi [2]3 years ago
7 0
This is a chemical change because there is a new substance that was created and the new chemical can cause other chemical reaction to happen compared to the 1st state of chemical that was in the cave. Because the cave water was exposed to another environment, the calcium bicarbonate, which is also known as salt. When the cave's groundwater was exposed to a different environment the atom in the cave water rearranged and crystallized.  
andreev551 [17]3 years ago
3 0

<u>Answer:</u> The correct answer is a new substance is formed in this process, which is an important clue to chemical change.

<u>Explanation:</u>

Chemical change is defined as the process in which change in composition takes place. A new substance gets formed in this process. For Example: Formation of water molecule from hydrogen and oxygen gas.

A physical change is defined as the process in which change in shape, size and color takes place. No change in composition takes place as no new substance is getting formed. For Example: Melting of ice

We are given:

Sodium carbonate is being formed from sodium bicarbonate. The reaction for this follows:

2NaHCO_3(s)\rightarrow Na_2CO_3(s)+CO_2(g)+H_2O(l)

As, new substance which is sodium carbonate is getting formed. Thus, it is a chemical change.

Hence, the correct answer is a new substance is formed in this process, which is an important clue to chemical change.

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5 0
3 years ago
Read 2 more answers
A student who is performing this experiment pours an 8.50 mL sample of the saturated borax solution into a 10 mL graduated cylin
belka [17]

Answer:

Ksp = 0.1762

Explanation:

Applying

a) moles of HCl added, n= CV=0.5×0.012 = 6×10-3mol

b) since 0.006mol is present in 0.012dm3 of HCl

It implies moles of borax

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6 0
3 years ago
Part A:
uranmaximum [27]

Answer:

Part A = The mass of sulfur is 6.228 grams

Part B = The mass of 1 silver atom is 1.79 * 10^-22 grams

Explanation:

Part A

Step 1: Data given

A mixture of carbon and sulfur has a mass of 9.0 g

Mass of the product = 27.1 grams

X = mass carbon

Y = mass sulfur

x + y = 9.0  grams

x = 9.0 - y

x(molar mass CO2/atomic mass C) + y(molar mass SO2/atomic mass S) = 22.6

(9 - y)*(44.01/12.01) + y(64.07/32.07)

(9-y)(3.664) + y(1.998)

32.976 - 3.664y + 1.998y = 22.6

-1.666y = -10.376

y = 6.228 = mass sulfur

x = 9.0 - 6.228 = 2.772 grams = mass C

The mass of sulfur is 6.228 grams

Part B

Calculate the mass, in grams, of a single silver atom (mAg = 107.87 amu ).

Calculate moles of 1 silver atom

Moles = 1/ 6.022*10^23

Moles = 1.66*10^-24 moles

Mass = moles * molar mass

Mass = 1.66*10 ^-24 moles *107.87

Mass = 1.79 * 10^-22 grams

The mass of 1 silver atom is 1.79 * 10^-22 grams

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Monica [59]

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3 years ago
The research step in the process of creating a hypothesis refers to _____.
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The is the B) doing background research about the question
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3 years ago
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