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Ghella [55]
3 years ago
8

Is rubber band stretching physical or chemical

Chemistry
2 answers:
Gnoma [55]3 years ago
5 0

Answer:

physical

Explanation:

this is a physical action to create a change. does not involve chemicals or elements

Rus_ich [418]3 years ago
5 0

Answer:

\boxed {\boxed {\sf Physical \ change}}

Explanation:

A chemical change, as the name suggests, must result from a change in the chemical makeup and new substances are produced. A very common example is metal rusting.

A physical change can be observed without a change in chemical composition. No new substances are produces. Ripping paper and an ice cube melting are physical changes.

A rubber band stretching is a <u>physical change.</u> No new substances are made and the chemical makeup remains the same.

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What are the spectator ions in the reaction between mg(oh)2 (aq) and hcl (aq)?
vivado [14]

The spectator ions in the reaction between aqueous Mg(OH)_2 and aqueous HCl would be   Mg^{2+ and Cl^- ions.

<h3>What are spectator ions?</h3>

Spectator ions are anions or cations that exist both as reactants and as products in a reaction. Their forms remain unchanged both in the reactants and in the products.

Aqueous Mg(OH)_2 and aqueous HCl  react according to the following equation:

Mg (OH)_2 (aq) + 2HCl (aq) --- > MgCl_2 (aq) +2 H_2O (l)

Before the reaction, Mg^{2+ and Cl^- existed in the reactants as Mg(OH)_2 and HCl respectively. After the reaction,  Mg^{2+ and Cl^- exist as MgCl_2 in the product.

Thus, the spectator ions in this case are  Mg^{2+ and Cl^- ions because their forms did not change after the reaction.

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6 0
10 months ago
How many moles of sulfur will be needed to oxidize 3 moles of zinc to zinc sulfide
Ksenya-84 [330]

Answer : The number of moles of sulfur needed to oxidize will be, 3 moles

Solution : Given,

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From the balanced reaction, we conclude that

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A grain of sand weighs approximately 0.0102 grams. How many molecules of SiO2 are in a grain of sand? Assume that sand is 100% S
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