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4 years ago

Classify each of these reactions.

Chemistry

1 answer:

Serga [27]4 years ago

4 0

Answer:

1. REDOX

2. None of the above

3. Precipitation

4. Preicipitation

5. Acid base neutralization

Explanation:

Reactions where a solid is formed, are named as precipitation. This solid is called precipitated.

Option 4 and 3.

3) CaO (s) + CO₂ (g) → CaCO₃(s)

4) KOH (aq) + AgCl (aq) → KCl (aq) + AgOH(s)

Reactions where water is produced, and you have an acid and a base as reactants, are named as neutralization. You called them acid-base because, the products.

5) Ba(OH)₂ (aq) + 2HNO₂(aq) → Ba(NO₂)₂ (aq) + 2H₂O(l)

Redox, are the reactions where one of the reactans can be oxidized and reduced, when a mole of electrons is released, or gained.

1) Ba(ClO₃)₂ (s) → BaCl₂ (s) + 3O₂(g)

Oxygen from the chlorate is oxidized (increases the oxidation state from -2 to 0) and the chlorine is reduced (decreases the oxidation state from +5 to -1).

2. 2NaCl(aq) + K₂S(aq) Na₂S (aq) + 2KCl (aq)

None of the above

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Question 1<br> Review<br> Which laboratory equipment is correctly paired with the unit it measures?

Bad White [126]

Answer:

Cilindros graduados

Explanation:

Son una herramienta de medición primaria para el volumen de un líquido, y tiene varias marcas hacia arriba y hacia abajo a lo largo del contenedor con incrementos específicos. Los cilindros graduados vienen en muchos tamaños; entre más pequeños sean de diámetro, más específicas serán las mediciones de volumen. Al leer el volumen de un cilindro graduado, notarán que el líquido parece tener una muesca; el líquido alrededor de los bordes será más alto que el líquido en el centro, inclinándose hacia abajo como los lados de un trampolín cuando alguien está parado en el medio. Esto se llama el menisco. Alineen el punto más bajo del menisco con la marca más cercana, manteniendo el nivel del cilindro para leer correctamente el volumen.

6 0

3 years ago

Sodium hydroxide, NaoH , is a strong base that is used im industrial synthesis and processes such as making paper. What is the m

valentinak56 [21]

<h3>Answer:</h3>

1.926 g of NaOH

<h3>Explanation:</h3>

Concept tested: Mole and Avogadro's number

We need to know that , 1 mole of a compound contains number of molecules equivalent to the Avogadro's number.

Th Avogadro's number is 6.022 × 10^23

Therefore;

1 mole of a compound = 6.022 × 10^23 molecules

In this case; Our compound is NaOH

Therefore;

1 mole of NaOH contains 6.022 × 10^23 molecules

But; Molar mass of NaOH is 40.0 g/mol

Therefore;

40.0 g of NaOH contains 6.022 × 10^23 molecules

With this we can calculate the mass of 2.90 × 10^22 molecules

Mass of a compound = (number of molecules ÷ Avogadro's constant) × molar mass

Therefore;

Mass of NaOH =(2.90 × 10^22 molecules ÷ 6.022 × 10^23 molecules)40g

= 1.9263 g

= 1.926 g NaOH

Thus, the mass of NaOH is 1.926 g

8 0

4 years ago

How may moles are in 19L of oxygen gas?

skad [1K]

Answer:

$0.85\,\,mole$

Explanation:

Given: 19 L of oxygen gas

To find: Number of moles in 19 L of oxygen gas

Solution:

In International System of Units, the mole is the unit of measurement for amount of substance. A mole of a mole of particles is defined as exactly 6.02214076×10²³ particles. Particles may be atoms, molecules, ions, or electrons.

As 1 mole = 22.4 L, 1 L = 1/22.4 mole

So, $19L=\frac{19}{22.4}\,\,moles=0.85\,\,mole$

5 0

4 years ago

Chất nào dưới đây không phải là este?<br> A. HCOOC6H5 B. HCOOCH3 C. CH3COOH D. CH3COOCH3

frozen [14]

Answer:

C nhé ! CH3COOH là axit chứ không phải este

8 0

3 years ago

Star a color and type

Archy [21]

Alpha Cancri is called Acubens.
<span>Spectral type A2 (white) + A5 (white), binary. </span>
<span>Main sequence star. </span>
<span>174 lightyears from Earth. </span>
<span>RA 8h 58m 29.2s. </span>
<span>Dec +11d 51' 28". </span>
<span>Effective temperature 8200K. </span>
<span>Mass (estimated, each component): 2 solar masses = 4e30 kilograms. </span>
<span>Special note: Sailor Moon's astrological sign is Cancer.

hope that helped</span>

7 0

3 years ago