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2 years ago

WILL GIVE BRAINLIEST!!!!

Chemistry

1 answer:

Tcecarenko [31]2 years ago

6 0

Answer:

A i am pretty sure if not let me know and i will fix it.

Explanation:

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The atoms of a certain element each contain 19 protons and 1 valence electron. Which statement correctly identifies this element

Leya [2.2K]

Answer

its a potassium elements

Explanation:

K 2,8,8,1 period num 4

group 1A

or 1s1 ,2s2 2p6, 3s1

its a metal reacted rapidly with water to form a colorless basic solution of potassium hydroxide (KOH) and hydrogen gas (H2). The reaction continues even when the solution becomes basic. The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

3 0

3 years ago

A well-insulated, closed device claims to be able to compress 100 mol of propylene, acting as a SoaveRedlich-Kwong gas and with

Setler79 [48]

Explanation:

The given data is as follows.

Moles of propylene = 100 moles, $T_{i}$ = 300 K

$T_{f}$ = 800 K, $V_{i} = 2 m^{3}$

$V_{f} = 0.02 m^{3}$ , $C_{p}$ of propylene = 100 J/mol

Now, we assume the following assumptions:

Since, it is a compression process therefore, work will be done on the system. And, work done will be equal to the heat energy liberating without any friction.

W = $mC_{p} \Delta T$

$100 moles \times 100 J/mol K (800 - 300) K$

= $5 \times 10^{6} J$

= 5 MJ

Thus, we can conclude that a minimum of 5 MJ work is required without any friction.

3 0

3 years ago

During a solvent extraction, a student lost track of which layer was the aqueous layer and which layer was the organic layer. Wh

KatRina [158]

Answer:

a. add a little distilled water to see which layer the water adds to

Explanation:

The problem tells us to keep in mind two major aspects of the test: It has to be <em>simple</em>, as well as <em>non-destructive</em>:

Adding distilled water can be made in under a minute, without requiring specialized laboratory equipment, unlike IR.
It is also non-destructive, because the contents on either layer won't change due to the added distilled water.

4 0

3 years ago

Read 2 more answers

The mass of an unidentified metal sphere is 133 grams. Students determine the

Rainbow [258]

Given the data from the question, the identity of the unknown metal having a of mass 133 g is Cobalt

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to determine the density </h3>

Mass = 133 g
Volume of water = 25 mL
Volume of water + metal = 40 mL
Vol of metal = 40 – 25 = 15 mL

Density =?

Density = mass / volume

Density = 133 / 15

Density = 8.86 g/mL

Comparing the density of the unknown metal (i.e 8.86 g/mL) with those given in the chart in the question above, we can conclude that the unknown metal is Cobalt

Learn more about density:

brainly.com/question/952755

4 0

3 years ago

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Diano4ka-milaya [45]

Answer:

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5 0

3 years ago