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Nadya [2.5K]
4 years ago
9

Which of the following is a common sign that a chemical change has occurred?

Chemistry
1 answer:
Bond [772]4 years ago
7 0
A chemical has changed into a different state
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What is the molarity of a solution that contains 2.93 g of NaCl dissolved in 0.025 L? 0.0012 M 0.050 M 1.3 M 2.0 M​
MakcuM [25]

Answer:

2.0 M

Explanation:

Step 1: Given data

  • Mass of NaCl (solute): 2.93 g
  • Volume of the solution: 0.025 L

Step 2: Calculate the moles corresponding to 2.93 g of NaCl

The molar mass of NaCl is 58.44 g/mol.

2.93 g × 1 mol/58.44 g = 0.0501 mol

Step 3: Calculate the molarity of the solution

Molarity is equal to the moles of solute divided by the liters of solution.

M = 0.0501 mol/0.025 L = 2.0 M

4 0
3 years ago
2 bromocyclopentanamine structural formula
Elis [28]

Answer:

The structure is given in attached file.

Explanation:

Explanation

2-bromocyclopentamine (Figure attached) is a synthetic compound which is synthesized by substitution reaction of cyclopentamine and hydrobromide. Its molecular formula and molecular mass are C5H10NBr and 164.05 mol/g respectively.  It is a very reactive compound so it doesn’t available in pure form, it is present in market as a mixture of 2-bromocyclopentamine and Hydrobromide.

Properties :

Its boiling point is 115 0C

Its melting point is – 75 oC

It is highly flammable

It is highly toxic

It is irritant

It is corrosive in nature

5 0
3 years ago
Which statement is accurate about the number of genes in different species of living things? A. All living things have about the
Brut [27]
Answer is D you welcome
6 0
3 years ago
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Help please if you can answer this first I'll give you the brainliest
tekilochka [14]

Answer:

1 GAS

Explanation:

8 0
3 years ago
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What is the Volume of the salt solution? ​
hammer [34]
<h3>Answer:</h3>

61.3 mL

<h3>Explanation:</h3>

From the data given;

  • Mass of volumetric flask is 109.1 g
  • Mass of salt is 5.01 g
  • Mass of Volumetric flask and salt is 113.5 g
  • Mass of volumetric flask and salt solution is 170.4 g
  • Mass of salt solution is 61.3 g

We are required to calculate the volume of salt solution;

We need to know the relationship between density, mass and volume of a solution.

Density = Mass ÷ Volume

Therefore, given mass and density we can find the volume.

Rearranging the formula;

Volume = Mass ÷ density

Assuming the density of salt solution is 1 g/mL

Then;

Volume = Mass of the salt solution ÷ density of the salt solution

             = 61.3 g ÷ 1 g/mL

             = 61.3 mL

Therefore, the volume of the salt solution is 61.3 mL

3 0
3 years ago
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