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pogonyaev
3 years ago
12

Classify each of the following as a pure substance or a mixture; if it is a mixture, state whether it is heterogeneous

Chemistry
1 answer:
Juli2301 [7.4K]3 years ago
6 0

Answer:

(a) Heterogeneous mixture; (b) heterogeneous mixture;

(c) heterogeneous mixture; (d) homogeneous mixture; (e) pure substance.

Explanation:

(a) Concrete

Heterogeneous mixture. Concrete is a mixture of sand, gravel, and crushed stone held together with a cement.

In a heterogeneous mixture, you can see definite boundaries between the various components.  

(b) Tomato juice

Heterogeneous mixture. It consists of water, tomato pulp, salt, and other substances.

(c) Marble

Heterogeneous mixture. It consists mostly of CaCO₃, but it usually contains other substances such as mica, quartz, pyrite, and iron oxides.  

(d) Seawater

Homogeneous mixture. Seawater is an aqueous solution of NaCl along with other ions like Mg²⁺, Ca²⁺ ,and SO₄²⁻.

(e) Iron

Pure substance. Iron is an element. It consists only of Fe atoms.

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Elements whose names end with âium are usually metals; sodium is one example. Identify a nonmetal whose name also ends with âium
Makovka662 [10]

Answer: Helium (He) and Selenium (Se) both are non metals ends with ium sound

Explanation:

He is a inert gas and Se belongs to oxygen family (VI A group)

8 0
3 years ago
As
Mars2501 [29]

Explanation:

  1. area of rectangle=l×b
  • 15=5×b
  • b=3cm

2.area of rectangle=l×b

  • 28=l×4
  • l=7cm

3. perimeter of square=4×L

  • 24=4×L
  • L=6cm

4. perimeter of rectangle=2(L+b)

  • 14=2(4+b)
  • 14=8+2b
  • 2b=6
  • b=3cm

hope it helps.

4 0
3 years ago
Read 2 more answers
What is oxidized and what is reduced <br> C2H4 + 2O2 → 2CO + 2H2O<br> C2H4 + 3O2 → 2CO2 + 2H2O
Anika [276]

C2H4 is oxidized and O2 is reduced in both reactions.

<h3>What is oxidation/reduction?</h3>

Oxidation is defined in several ways. Some of the definitions are:

  1. The addition of oxygen or removal of hydrogen
  2. Increase in the oxidation number of atoms
  3. Addition of electronegative or the removal of electropositive elements

Reduction, on the other hand, is defined as:

  1. Removal of oxygen or addition of hydrogen
  2. Decrease in the oxidation number of atoms
  3. Addition of electropositive elements or the removal of electronegative elements.

In the two reactions, oxygen is being added to C2H4. Thus, C2H4 is being oxidized.

The oxidizing agent is O2. In oxidation reactions, the oxidizing agents usually get reduced. Thus, O2 is reduced in both reactions.

More on oxidation and reduction can be found here: brainly.com/question/3867774

#SPJ1

7 0
2 years ago
(5points) Na2[Fe(OH2)2(OH)I3]absorbs photons with energy of 191kJ/mol. Calculate the wavelength (in nm) for a photon absorbed by
AfilCa [17]

Answer:

626.7nm

Explanation:

The energy of a photon is defined as:

E = hc / λ

<em>Where E is the energy of the photon, h is Planck constant (6.626x10⁻³⁴Js), c is speed of light (3x10⁸m/s) and </em>λ is the wavelength of light

The energy of 1 photon is:

(191000 J / mol) ₓ (1 mole / 6.022x10²³) = 3.1717x10⁻¹⁹ J

Replacing:

3.1717x10⁻¹⁹ J = <em>6.626x10⁻³⁴Jsₓ3x10⁸m/s /  </em>λ

λ = 6.267x10⁻⁷m

as 1nm = 1x10⁻⁹m:

6.267x10⁻⁷m ₓ (1nm / 1x10⁻⁹m) =

<h3>626.7nm</h3>
6 0
3 years ago
Please Help Why is laboratory safety important? Describe a scenario illustrating your reason(s).
Virty [35]
So that you can learn while being safe. Wearing goggles, for eye protection when dealing with chemicals
3 0
3 years ago
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