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2 years ago

In a heating curve, when is the temperature constant?

Chemistry

1 answer:

sammy [17]2 years ago

6 0

During a pressure change because they Heat is changing it consistently

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A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. What is the weight/

lara31 [8.8K]

Answer:

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :

2.67%

Explanation:

Note : Look at the density of potassium nitrate in water if given in the question.

You are calculating weight /Volume not weight/weight % or percent by mass of the solute

Here the weight/weight % or percent by mass of the solute is asked : So first convert the VOLUME OF SOLUTION into MASS

Density of potassium nitrate in water KNO3 = 2.11 g/mL

$density=\frac{mass}{volume}$

Density = 2.11 g/mL

Volume of solution = 86.4 mL

$2.11=\frac{mass}{86.4}$

$mass = 2.11\times 86.4$

$mass=182.3grams$

Mass of Solute = 4.87 g

Mass of Solution = 183.2 g

w/w% of the solute =

$= \frac{mass\ of\ solute}{mass\ of\ solution}\times 100$

$=\frac{4.87}{183.2}\times 100$

w/w%=2.67%

8 0

3 years ago

How does concentration affect the chemical equilibrium?

nevsk [136]

When the concentration of a reactant is increased, the chemical equilibrium will shift towards the products. More product is formed and the concentration of the reactants decreases as the concentration of the products increases.

7 0

3 years ago

Define the term pH in acid and base

Kaylis [27]

Answer:

a measure of how acidic/base water is.

Explanation:

hope it's helpful (◕ᴗ◕✿)

3 0

2 years ago

Draw the structural formula for fatty acid C 18:2 9 a 12a

qwelly [4]

Answer:

............................................................................

Explanation:

7 0

3 years ago

Group 17 is called the halogen family, and the group to its right is called the noble gases. How are these elements alike and ho

Vesnalui [34]

Explanation:

The halogen family and noble gases are similar in just one particular way, they are groups of non-metals. All members of these two groups are categorized as non-metals.

Here are some of the differences between them;

Halogens have 7 electrons in their outermost shell whereas noble gases have 8 electrons in theirs.
Halogens are highly reactive elements, noble gases are non-reactive.
Halogens are made up of electronegative elements where as noble gases are neither electropositive nor electronegative.

4 0

3 years ago