3 years ago

Can y'all give me some examples of physical changes

1 answer:

4 0

Something that melts, something that changes shapes (for instance, play dough being squished), something that boils, something being mixed or dissolved (but only if it doesn't chemically react), etc. A physical change is a change of state of matter.

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Zinc blende, or sphalerite, can be described as having a face-centered cubic unit cell with sulfur atoms at each lattice point a

g100num [7]

Answer:

ZnS

Explanation:

1. Number of Zn atoms

4 internal atoms = 4 Zn atoms

2. Number of S atoms

8 corners × ⅛ S atom/corner + 6 faces × ½ S atom/face = 1 S atom + 3 S atoms = 4 S atoms

3. Empirical formula

The atomic ratio is

4Zn:4S = 1Zn:1S

The empirical formula is ZnS.

7 0

3 years ago

Ammonia + nitrogen ➡️ Ammonium nitride<br><br><br>Write word equation and balance it

vlabodo [156]

Answer:

NH3+O2=N2+H2O

Explanation:

8 0

3 years ago

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What is photosynthesis???

siniylev [52]

The power of which green plants use water and other organisms for energy and synthesize them<span />

6 0

3 years ago

For the reaction 2H 2 +O 2 2H 2 O calculate the percent yield if 860. of water is produced when 100. g of hydrogen react with an

-BARSIC- [3]

The percent yield : 95%

<h3> Further explanation </h3>

Given

Reaction

2H₂+O₂ ⇒2H₂O

Required

The percent yield

Solution

mol of Hydrogen(as a limiting reactant) :

$\tt \dfrac{100}{2}=50$

mol H₂O based on H₂ , and from equation mol ratio H₂:H₂O=2 : 2, so mol H₂O = 50

Mass of water(theoretical yield) :

$\tt mass=50\times 18=900~g$

$\tt \%yield=\dfrac{860}{900}\times 100\%=95\%$

3 0

3 years ago

Ionic compounds are compounds made of?

Llana [10]

Answer:

Explanation:

it made of metals and non metals

3 0

3 years ago