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andreyandreev [35.5K]

3 years ago

8

In the unit 2 lab, what combination produced a brown bubbly liquid that looks like root-beer? (Select the two parts of the combi

nation)
Chalk

NaCl

KCl

Baking Soda

Sugar

Vinegar

Water

Citric Acid

Vegetable Oil

NaOH

Helpppppppp right now please

1 answer:

LekaFEV [45]3 years ago

6 0

Baking soda and chalk

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What is the term for a solid that forms when two solutions are mixed?

Inessa [10]

Option D

A precipitate is the term for a solid that forms when two solutions are mixed

<u>Explanation:</u>

A solid set from a couple of solutions is termed a precipitate. A precipitate is an unsolved solid that makes when a pair of solutions are fused and react chemically. Unsolvable means that the solid will not melt. When the effect transpires in a liquid solution, the solid developed is denominated the 'precipitate'.

The substance that generates the solid to make is termed the 'precipitant'. Seldom the development of a precipitate symbolizes the existence of a chemical reaction. Precipitation may additionally transpire immediately from a supersaturated solution.

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3 years ago

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How many of the following postulates of Dalton's atomic theory are still scientifically accepted? I. All atoms of the same eleme

Neko [114]

<h2>The required "options are (II), (III), and (IV)".</h2>

Explanation:

Postulates of Dalton's atomic theory which are scientifically accepted are:

Atoms are indestructible.
Compounds are combinations of different atoms.
A chemical reaction changes the way atoms are grouped together.

Postulates of Dalton's atomic theory which are not accepted scientifically are:

All atoms of the same elements are identical.

The theory states that the atoms of the same element are identical in every aspect but it is now scientifically proved that the same element should differ in their mass which is known as isotopes.

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3 years ago

Chromium(III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium(III) sulfide and water: Cr2O3(s) + 3H2S(g) → Cr2S3(s

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Answer:

(a) 0.779 mol Cr₂O₃

(b) 118 g Cr₂O₃

Explanation:

Step 1: Convert 156 g Cr₂S₃ to moles

Cr Molar Mass - 52.00 g/mol × 2 = 104.00 g/mol

S Molar Mass - 32.07 g/mol × 3 = 96.21 g/mol

156 g Cr₂S₃ ÷ 200.21 g/mol = 0.779182 mol Cr₂S₃

Step 2: Find conversion from Cr₂S₃ to Cr₂O₃

1 mol Cr₂S₃ equals 1 mol Cr₂O₃

Step 3: Use Dimensional Analysis

0.779182 mol Cr₂S₃ · $\frac{1 \hspace{2} mol \hspace{2} Cr_2O_3}{1 \hspace{2} mol \hspace{2} Cr_2S_3}$ = 0.779182 mol Cr₂O₃

0.779182 mol Cr₂O₃ ≈ 0.779 mol Cr₂O₃ (3 significant figures)

Step 4: Convert moles to grams

Cr Molar Mass - 52.00 g/mol × 2 = 104.00 g/mol

O Molar Mass - 16.00 g/mol × 3 = 48.00 g/mol

0.779182 mol Cr₂O₃ · 152.00 g/mol = 118.436 g Cr₂O₃

118.436 g Cr₂O₃ ≈ 118 g Cr₂O₃ (3 significant figures)

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2 years ago

What effect does gravity have on a slinky

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If you consider the motion of the slinky as just one object, you can look at it's center of mass. From the whole slinky point of view, there is only one force on the slinky - the gravitational force. This means that it falls and accelerates downward with an acceleration of -9.8 m/s2 just like all free-falling objects. Plze mark brainiest

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3 years ago

What is the square root of the atomic number for manganese

Vanyuwa [196]

For this case, we have that by definition:

<em>Manganese is a chemical element that has an atomic number equal to 25. This element is located in group 7 of the periodic table of the elements. The symbol for this element in the periodic table is: Mn. </em>

Therefore, taking the square root we have:

$\sqrt {25} = 5$

Answer:

the square root of the atomic number for manganese is 5.

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3 years ago