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2 years ago

Identify two ways recycling can reduce energy use?

1 answer:

7 0

Using recycled aluminum cans to make new aluminum cans uses 95% less energy than using bauxite ore, the raw material aluminum is made from. Recycling paper saves trees and water. For every one ton of paper made from recycled paper, it saves up to 17 trees and uses 50% less water.

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Chemistry!! Please help

m_a_m_a [10]

Answer:

5.3 × 10⁻¹⁷ mol·L⁻¹

Explanation:

Let <em>s</em> = the molar solubility.

Cu₂S(s) ⇌ 2Cu⁺(aq) + S²⁻(aq); K_{sp} = 6.1 × 10⁻⁴⁹

E/mol·L⁻¹: 2<em>s</em> <em>s </em>

K_{sp} =[Cu⁺]²[S²⁻] = (2<em>s</em>)²×<em>s</em> = 4s^3 = 6.1 × 10⁻⁴⁹

$s^{3}= \frac{6.1 \times 10^{-49}}{4} = 1.52 \times 10^{-49}$

$s = \sqrt[3]{1.52 \times 10^{-49}} \text{ mol/L} = 5.3 \times 10^{-17} \text{ mol/L}$

6 0

3 years ago

Water and carbon dioxide are both made of 3 atoms<br> True or false

garri49 [273]

Carbohydrates are biological molecules made of carbon, hydrogen, and oxygen in a ratio of roughly one carbon atom (
C
Cstart text, C, end text) to one water molecule (
H
2
O
H
2

Ostart text, H, end text, start subscript, 2, end subscript, start text, O, end text). This composition gives carbohydrates their name: they are made up of carbon (carbo-) plus water (-hydrate). Carbohydrate chains come in different lengths, and biologically important carbohydrates belong to three categories: monosaccharides, disaccharides, and polysaccharides.

3 0

3 years ago

1. How many moles of magnesium is 3.01 x 10^23 atoms of magnesium?

AlexFokin [52]

Answer:

<h2>0.5 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{3.01 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.01}{6.02} = 0.5 \\$

We have the final answer as

<h3>0.5 moles</h3>

Hope this helps you

7 0

3 years ago

The lewis dot structure for CSBr2?

AfilCa [17]

Answer:

See attached picture.

Explanation:

Hello!

In this case, by considering that the carbon has four valence electrons as it is in group IVA, sulfur has six valence electrons as it is in group VIA and bromine has seven valence electrons as it is in group VIIA we infer that the carbon is the central atom in CSBr2 so one double bond between carbon and sulfur makes it complete the octet and two carbon-to-bromine bonds are formed in order to complete the octets of both carbon and bromine as shown on the attached picture.

Best regards!

3 0

3 years ago

Expain why 4-methyl pentane is not a correct name

ziro4ka [17]

Answer: 2-Methylpentane

Explanation: The numbering is not brought to a minimum.

8 0

3 years ago