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3 years ago

Which observation about the rock best supports this classification?

Chemistry

2 answers:

shutvik [7]3 years ago

6 0

The rock contains fragments of other rocks.
(B)

dedylja [7]3 years ago

3 0

The answer: I think a

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HELP PLZ!CHEMISTRY.WILL GIVE BRAINLIEST!!!!

Andrej [43]

1. 12 L = 12 dm³

2. 3.18 g

<h3>Further explanation</h3>

Given

1. Reaction

K₂CO₃+2HNO₃⇒ 2KNO₃+H₂O+CO₂

69 g K₂CO₃

2. 0.03 mol/L Na₂CO₃

Required

1. volume of CO₂

2. mass Na₂CO₃

Solution

1. mol K₂CO₃(MW=138 g/mol) :

= 69 : 138

= 0.5

mol ratio of K₂CO₃ : CO₂ = 1 : 1, so mol CO₂ = 0.5

Assume at RTP(25 C, 1 atm) 1 mol gas = 24 L, so volume CO₂ :

= 0.5 x 24 L

= 12 L

2. M Na₂CO₃ = 0.03 M

Volume = 1 L

mol Na₂CO₃ :

= M x V

= 0.03 x 1

= 0.03 moles

Mass Na₂CO₃(MW=106 g/mol) :

= mol x MW

= 0.03 x 106

= 3.18 g

3 0

3 years ago

Read 2 more answers

Structure of 2,3-dimethylheptane

olga55 [171]

Answer:

Please find the structure of the hydrocarbon in the attachment section and details on how to draw it in the explanation section.

Explanation:

Heptane is a member of the alkane group, which has a general formula of CnH2n+2. If n in heptane is 7, this means that the chemical formula for heptane will be C7H16 i.e.

= C7H2(7) + 2

= C7H14+2

= C7H16

C7H16 is the chemical formula for heptane, which is a linear hydrocarbon with 7 carbon atoms and 16 hydrogen atoms. However, in the name of the hydrocarbon compound given in the question: 2,3-dimethylheptane;

- Two methyl groups (CH3) has a substituted two hydrogen atoms specifically at carbon 2 and 3 respectively. Therefore, the new chemical formula of 2,3-dimethylheptane will be: C7H14(CH3)2

Please find the structural formula of the compound; 2,3-dimethylheptane as an attachment.

3 0

3 years ago

2. Name three factors that influence the rate at which a solute dissolves in a solvent?<br>

agasfer [191]

Answer:

1. Temperature

2. Surface area

3. Catalyst

Explanation:

3 0

3 years ago

Read 2 more answers

An ionic compound is typically made of

Margaret [11]

<span>Metal + Polyatomic ion → ionic compound

I'm guessing ions since it is also an ionic compound</span>

6 0

3 years ago

Which of the following can be mixed in solution with NH3 to make a buffer?A. NH4CIB. NaClC. HNO3D. NaOH

Lynna [10]

<h2>Answer:</h2>

A.NH4Cl

<h2>Explanations:</h2><h2>How are buffer formed?</h2>

Buffers are formed by mixing an equal amount of weak base or acids and their corresponding salts.

Therefore in order to make a buffer with NH3 (a weak base), then a corresposding weak salt is required. A corresponding salt for the given base is NH4Cl

3 0

1 year ago