All categories

3 years ago

8. Stephen performed an experiment to see how listening to music affects a student's test scores.

Chemistry

1 answer:

Brut [27]3 years ago

7 0

Answer:

Here's what I get

Explanation:

The hypothesis comes before the experiment.

However, it might something like

Listening to music while studying will improve student's test scores
Listening to music while studying will have no effect on student's test scores
Listening to music while studying will worsen student's test scores

You might be interested in

Question 13 What is the base name for the following compound? C-C=0

White raven [17]

Explanation:

What is the base name for the following compound? C-C=0. Add answer+5 pts. Log in to add comment.

7 0

3 years ago

What mass of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution?

inna [77]

Answer:

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

Explanation:

Molarity is a measure of the concentration of a solute in a solution that indicates the amount of moles of solute that appear dissolved in one liter of the mixture. In other words, molarity is the number of moles of solute that are dissolved in a given volume.

The Molarity of a solution is determined by the following expression:

$Molarity=\frac{number of moles of solute}{volume}$

Molarity is expressed in units $\frac{moles}{liter}$

In this case:

Molarity: 1.56 M= 1.56 $\frac{moles}{liter}$
Number of moles of calcium chlorine= ?
Volume= 2.657 liters

Replacing:

$1.56 M=\frac{Number of moles of calcium chlorine}{2.657 liters}$

Solving:

Number of moles of calcium chlorine= 1.56 M* 2.657 liters

Number of moles of calcium chlorine= 4.14 moles

In other side, you know:

Ca: 40 g/mole
Cl: 35.45 g/mole

Then the molar mass of the calcium chloride CaCl₂ is:

CaCl₂= 40 g/mole + 2* 35.45 g/mole= 110.9 g/mole

Now it is possible to apply the following rule of three: if in 1 mole there is 110.9 g of CaCl₂, in 4.14 moles of the compound how much mass is there?

$mass=\frac{4.14 moles*110.9g}{1 mole}$

mass= 459.126 g

459.126 grams of calcium chloride is needed to prepare 2.657 L of a 1.56 M solution

3 0

3 years ago

Define renewable and nonrenewable resources and give 3 examples

liubo4ka [24]

Renewable resources are resources that can be used repeatedly. Examples are wood, wind power, and solar energy.

Nonrenewable resources are resources that cannot be replaced naturally. Examples are oil, coal, and minerals.

4 0

3 years ago

Describe the term molarity as it relates to an acid or base.

Sidana [21]

Molarity is expressed as the number of moles of solute per volume of the solution. For example, we are given a solution of 2M NaOH this describes a solution that has 2 moles of NaOH per 1 L volume of the solution. Acids and bases can be measured through the concentrations of H+ and OH- ions in units of molarity. Hope this helps.

4 0

3 years ago

Read 2 more answers

What are people who study wildfires called

NemiM [27]

The person is called a wildlife biologist.

3 0

3 years ago

Read 2 more answers