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Andre45 [30]
3 years ago
13

Which sample is a pure substance?

Chemistry
2 answers:
ArbitrLikvidat [17]3 years ago
6 0

Answer:

The answer is A. Test Tube of zinc oxide

Sonbull [250]3 years ago
5 0

Answer:

A. a test tube of zinc oxide

Explanation:

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I just need help plz!
Nesterboy [21]

Answer:

<u>Graphene</u> is a nanomaterial that is often used with other compounds to desalinate and decontaminate water.

The electrical behavior of semiconductor devices and electronics can be engineered using a process called <u>Doping</u>

Explanation:

4 0
2 years ago
What are the 3 most important ecosystem services of a coral reef
kkurt [141]
2 Corsls provide treatments
3 0
3 years ago
Read 2 more answers
3 Cu + 8HNO3 g 3 Cu(NO3)2 + 2 NO + 4 H2O
liubo4ka [24]

24.25 moles of NO can be produced using 97 moles of HNO3.

<h3>What is balanced chemical equation?</h3>

Equal numbers of atoms from various elements are present in both the reactants and the products in balanced chemical equations. Varied elements' atom counts in the reactants and products of unbalanced chemical equations are different.

3 Cu + 8HNO3 g → 3 Cu(NO3)2 + 2 NO + 4 H2O

The number of moles consumed can be calculated using comparing with coefficients in the balanced reaction .

So , from above eq we get that 8 moles of HNO3 are consumed to make 2 moles of NO.

⇒  8 HNO3⇔2 NO

⇒ 1 HNO3⇔ 1/4 NO

This means that for each mole of HNO3 produces 1/4 moles of NO.

So , for 97 moles of HNO3 , \frac{1}{4}  *97 moles of NO can be made,

So, total moles of NO made are 24.25 moles.

Lean more about balanced reactions here brainly.com/question/26694427

#SPJ10

3 0
2 years ago
Read 2 more answers
SOMEONE HELP PLEASE 60 POINTS!!!!!!! IM TIMED TOO SO PLS
Sergeu [11.5K]

Explanation:

ooohhhh it's free points,,,thank you mwahhh hahahahahaha jokeee

sorry I don't have any ideas

4 0
3 years ago
A student reduces the temperature of a 300 cm3 balloon from 60°c to 30°
FromTheMoon [43]

We can use the ideal gas equation which is expressed as PV = nRT. At a constant pressure and number of moles of the gas the ratio T/V is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

T1 / V1 = T2 / V2

V2 = T2 x V1 / T1

V2 = 303.15  x 300 / 333.15

<span>V2 = 272.99 cm³</span>

7 0
3 years ago
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