Students in science class watched as their teacher demonstrated various changes. Picture A. shows a strip of magnesium ribbon, a
silver metal, in a test tube of hydrochloric acid. Bubbles are forming as the metal ribbon disappears. Also, the test tube feels warmer. Picture B. shows a container of water being heated and bubbles forming as the water bubbles. Which picture illustrates a chemical change? Explain.
A) Picture A. The magnesium ribbon disappears.
B) Picture A. Gas bubbles are produced and there is a temperature change.
C) Picture B. Bubbles are being produced as the water is being heated on the burner.
D) Picture B. There is a change in temperature as the water begins to boil and bubbles are being produced.
A) Picture A. The magnesium ribbon disappears.
B) Picture A. Gas bubbles are produced and there is a temperature change.
C) Picture B. Bubbles are being produced as the water is being heated on the burner.
D) Picture B. There is a change in temperature as the water begins to boil and bubbles are being produced.
2 answers:
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Molar mass is the ratio of the mass to that amount of the substance. The mass of the barium nitrate in the formula unit is 23.0 grams.
<h3>What is mass?</h3>The mass of a substance is the product of the molar mass of the compound and the number of moles of the compound.
Given,
Molar mass of barium nitrate = 261.35 g/mol
If, have a mass of 261.35 g/mol then,
formula units will have a mass of,
Therefore, option C. 23.0 gm is the mass of barium nitrate.
Learn more about mass here: