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Lana71 [14]
3 years ago
11

Ben and Jerry were testing powders in science lab. First they put the powder in a zip lock bag. Next they added some water. The

powder fizzed and bubbled; soon it disappeared. When the bubbling stopped the bag contained a clear liquid and a lot of gas. What is the MOST OBVIOUS sign of a chemical change in this reaction. A) A gas was produced. B) The powder mixed with the water. C) There was a change in temperature. D) The powder dissolved in the water.
Chemistry
2 answers:
tangare [24]3 years ago
8 0
A) because when gas is produced it changes chemical form whereas the chemical change is obvious.
Montano1993 [528]3 years ago
5 0

Answer:

A) A gas was produced.

Explanation:

In a chemical change there is always a change in the chemical composition. When reactant reacts with one another new products are formed, the products have a different chemical composition than the reactants.  Option A is correct as gases have evolved as a result of chemical change.

Option B and D are physical changes therefore incorrect. When matter dissolves in water or mixes with another substance there is no change in the chemical composition of the said matter.

Option C is incorrect as change in temperature is a change in the kinetic energy of matter and is not a chemical change.

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FinnZ [79.3K]

Answer:

i fi am not wrong the correct answer is  D

Explanation:

5 0
3 years ago
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According to the rock cycle, which of the following transitions are possible? Assume an unlimited number of steps.
Vikentia [17]

(D)All of the above are possible.

Explanation:

According to the rock cycle, all of the transitions given are possible with several unlimited steps.

The rock cycle shows how the different rock types are transformed from one form to another.

In the rock cycle the major rock types are taken into consideration. These rock types are Igneous, sedimentary and metamorphic.

  • An intrusive igneous rock becomes a sedimentary rock.

Based on the rock cycle, an intrusive rock can become a sedimentary rock. This is igneous to sedimentary rock conversion. Here, the intrusive rock is brought during a terrain change to the surface. Weathering, erosion, transportation and deposition combines to produce sediments and take them to their basin of deposition where they form sedimentary rocks.

  • A sedimentary rock becomes soil.

By weathering, a sedimentary rock can be come a soil. Weathering is the physical disintegration and chemical decomposition of rocks to form sediments and soil.

  • A metamorphic rock becomes an extrusive igneous rock.

When metamorphic rocks are subjected to intense heat and pressure, they reach their melting point.

As they melt, they produce magma which can be brought to the surface to form extrusive volcanic rocks.

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6 0
3 years ago
If more solvent is added to a solution: a. The solution's molarity decreases. B. The solution becomes more concentrated C. The s
Sergeu [11.5K]
The correct answer is C
4 0
3 years ago
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Can someone please help me with this one?
kkurt [141]

Answer:

to my own understanding I think it's 65 percent

7 0
3 years ago
When glass is spun into fine fibers, the trapped air makes a thermal insulator. A. TRUE B. FALSE
Inessa05 [86]

Answer:

TRUE

Explanation:

Glass spun into fine fibers is called fiberglass and is commonly used as an insulator.

6 0
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