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4 years ago

A chemical reaction in which two elements or radicals change places with two other elements or radicals is a _ reaction

1 answer:

7 0

A chemical reaction in which 2 elements or atoms change places with two other elements and or reactive atoms would be a double displacement or double replacement reaction.

You might be interested in

What molecule is removed during dehydration synthesis?.

nignag [31]

Answer: two hydrogen atoms and one oxygen atom are removed during dehydration synthesis.

Hope this helps!

4 0

2 years ago

A metal spoon sits in a pot of boiling water. The spoon becomes warm. Which types of heat transfer contribute to the increase in

hammer [34]

This type of heat transfer is conduction.

6 0

3 years ago

The water gained 900 J of energy, what was the energy change of the metal?

Gemiola [76]

Answer:

it lost 900J of energy I will assume and that would mean the change in energy is -900J

Explanation:

4 0

3 years ago

Assuming complete dissociation of the solute, how many grams of KNO3 must be added to 275 mL of water to produce a solution that

iragen [17]

Answer:

108.43 grams KNO₃

Explanation:

To solve this problem we use the formula:

ΔT = Kf * b * i

Where

ΔT is the temperature difference (14.5 K)

Kf is the cryoscopic constant (1.86 K·m⁻¹)

b is the molality of the solution (moles KNO₃ per kg of water)

and i is the van't Hoff factor (2 for KNO₃)

We solve for b:

14.5 K = 1.86 K·m⁻¹ * b * 2

b = 3.90 m

Using the given volume of water and its density (aprx. 1 g/mL) we calculate the necessary moles of KNO₃:

275 mL water ≅ 275 g water

275 g /1000 = 0.275 kg

moles KNO₃ = molality * kg water = 3.90 * 0.275

moles KNO₃ = 1.0725 moles KNO₃

Finally we convert KNO₃ moles to grams, using its molecular weight:

1.0725 moles KNO₃ * 101.103 g/mol = 108.43 grams KNO₃

5 0

3 years ago

3. Ethanol has a density of 0.800 g/mL. a. What is the mass of 225 mL of ethanol?

dedylja [7]

Since the ethanol has a density of 0.800 g/mL, the mass of the ethanol is 180 grams.

Given the following data:

Volume of ethanol = 225 mL

Density of lead ball = 0.800 g/mL.

To find the mass of the ethanol;

Density can be defined as mass all over the volume of an object.

Mathematically, the density of a substance is given by the formula;

$Density = \frac{Mass}{Volume}$

Making mass the subject of formula, we have;

$Mass = Density \times Volume$

Substituting the given parameters into the formula, we have;

Mass of ethanol = 180 grams.

3 0

3 years ago