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Ilia_Sergeevich [38]
3 years ago
9

PLEASE HELP URGENT!! Read the short section below on the difference between everyday experience and science.

Chemistry
1 answer:
exis [7]3 years ago
4 0

Answer:

scientists are born and they made all law and everything

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Paper towel absorbs water is a physical or chemical change?
Marina CMI [18]
It depends. many of the websites i see answering the questions are all over the place, but good luck.
8 0
3 years ago
Most plastics are made from oil or natural gas. One step in making plastics from these resources is called cracking. Cracking is
kramer

Answer:

true im pretty sure

Explanation:

6 0
3 years ago
write a net ionic equation for the reaction that occurs when aqueous solutions of perchloric acid and potassium hydroxide are co
BaLLatris [955]

Answer:

H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)

Explanation:

Let's consider the molecular equation that occurs when aqueous solutions of perchloric acid and potassium hydroxide are combined. This is a neutralization reaction.

HClO₄(aq) + KOH(aq) ⇒ KClO₄(aq) + H₂O(l)

The complete ionic equation includes all the ions and molecular species.

H⁺(aq) + ClO₄⁻(aq) + K⁺(aq) + OH⁻(aq) ⇒ K⁺(aq) + ClO₄⁻(aq) + H₂O(l)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)

3 0
3 years ago
Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about
Allushta [10]

Answer:

The atoms are vibrating in place.

Explanation:

One of the properties of an ionic substance is the possession of a crystalline structure. As Gerry observed the salt under a microscope, he discovered that it has a crystalline structure. Crystalline salts are all ionic in nature, hence the salt observed by Gerry is an ionic salt.

Solids containing a definite crystalline structure always has their particles vibrating in place. This is immediately evident as Gerry looks at the salt through a microscope.

7 0
4 years ago
An analytical chemist weighs out 0.281g of an unknown diprotic acid into a 250mL volumetric flask and dilutes to the mark with d
Helen [10]

Answer:

166 g/mol

Explanation:

Step 1: Write the neutralization reaction

H₂A + 2 NaOH ⇒ Na₂A + 2 H₂O

Step 2: Calculate the reacting moles of NaOH

48.3 mL of 0.0700 M NaOH react.

0.0483 L × 0.0700 mol/L = 3.38 × 10⁻³ mol

Step 3: Calculate the reacting moles of H₂A

The molar ratio of H₂A to NaOH is 1:2. The reacting moles of H₂A are 1/2 × 3.38 × 10⁻³ mol = 1.69 × 10⁻³ mol.

Step 4: Calculate the molar mass of H₂A

1.69 × 10⁻³ moles of H₂A have a mass of 0.281 g. The molar mass of H₂A is:

M = 0.281 g / 1.69 × 10⁻³ mol = 166 g/mol

6 0
3 years ago
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