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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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An object has a mass of 20 g and displaces a volume of 5 mL. What is the object's density?
lara [203]

Hey There!:

The density is the quotient between the mass of a material and the volume occupied by it, The density can be expressed for a substance or for a mixture of substances. For example, water density in ambient conditions is equal to 1.00 g/cm3, which means that in 1 cm³ or 1 mL, there are 1.0 g of water. Therefore:

D = m / V

D = 20 g / 5 mL

D = 4,0 g/mL

hope that helps!


5 0
3 years ago
A balloon containing N2 has 1.70 moles and occupies 3.80L. What will the volume be if the number of moles is increased to 2.60mo
leonid [27]

Answer:

5.81L

Explanation:

N1 = 1.70 moles

V1 = 3.80L

V2 = ?

N2 = 2.60 moles

Mole - volume relationship,

N1 / V1 = N2 / V2

V2 = (N2 × V1) / N1

V2 = (2.60 × 3.80) / 1.70

V2 = 9.88 / 1.70

V2 = 5.81 L

The volume of the gas is 5.81L

8 0
3 years ago
Walls made of paraffin wax, a covalent compound, help keep the temperature in a room steady as night changes into day and day in
Over [174]
The wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down.
8 0
3 years ago
Read 2 more answers
A cake rises as it bakes because a chemical change causes ________to be produced
Sidana [21]
The correct  answer to this question is carbon dioxide. A cake rises as it bakes because a chemical change causes carbon dioxide to be produced. Thank you for posting your question. I hope that this answer helped you. Let me know if you need more help. 
5 0
3 years ago
Answer from this picture.
Ganezh [65]
Try photo math it will probably be more helpful
7 0
4 years ago
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