Is icy water a compound or a mixture?

How does scientific theory compare to scientific law

Troyanec [42]

N general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory.

6 0

3 years ago

To make a 2 M solution of calcium chloride (CaCl2), you would place how many grams of CaCl2 into a container and then add how mu

belka [17]

Answer:

For a volume of 1 liter, we have a total mass of 220 grams of CaCl2 ( Option A)

Explanation:

Step 1: Given data

The concentration of the solution we want to make is 2M

2M = 2 moles/ L So the volume = 1L

The molar mass of CaCl2 is = 40 + 2*35 = 110g/mole

Step 2: Calculate number of moles

If we consider the volume = 1 L then for a concentration of 2M, this means the number of moles is 2

Step 3: Calculate mass

The molar mass of CaCl2 = 110 g/mole

This means 110 grams per 1 mole

for 2 moles the mass is 220 grams

This means that for a volume of 1 liter, we have a total mass of 220 grams of CaCl2

6 0

3 years ago

What mass of nitrous oxide gas (N2O) is contained in 40.0 L balloon at a pressure of 130.0 kPa and a temperature of 25 °C?

tamaranim1 [39]

The mass of the N₂O in the given question is 92.4g.

<h3>What is the moles of N2O in the given conditions?</h3>

STEP1- Apply the ideal gas equation

PV=nRT

STEP2- Put the given values in the equation

P=130kPa, T=298K, V=40L R=8.31

STEP3- Solve the equation

N=PV/RT,

N=130×40/8.31×298

N=2.1moles

N=mass/molecular mass

mass=2.1×44

mass = 92.4g

Hence, the mass of N₂O is 92.4g.

learn more about ideal gas.

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7 0

2 years ago

As they pass through the rock cycle, atoms:

Arlecino [84]

Answer:

Option (C)

Explanation:

Atoms are the basic structures that are combined to form minerals, which are further accumulated giving rise to the formation of rocks. These atoms plays a significant role in the formation of rock and their significant characteristics.

When atoms are passed through the rock cycle, they are not able to move at the same rate, but they can move at a different rate. When a rock changes from one kind to another, its constituent minerals and atoms also alters, forming a different rock type with variable characteristics and properties.

Thus, the correct answer is option (C).

8 0

3 years ago

g 304 mL of a 0.36 M potassium hydroxide solution is added to 341 mL of a 0.51 M lithium hydroxide solution. Calculate the pOH o

Liono4ka [1.6K]

Answer:

pOH = 0.36

Explanation:

Both potassium hydroxide and lithium hydroxide solutions are strong bases, so you assume 100% dissociation.

1. Potassium hydroxide solution, KOH

Volume, V = 304 mL = 0.304 liter

Molarity, M = 0.36 M

number of moles, n = M × V = 0.36M × 0.304 liter = 0.10944 mol

1 mole of KOH produces 1 mol of OH⁻ ion, thus the number of moles of OH⁻ is 0.10944

2. LIthium hydroxide, LiOH

Volume, V = 341 mL = 0.341 liter

Molarity, M = 0.51 M

number of moles, n = M × V = 0.341 liter × 0.51 M = 0.17391 mol

1mole of LiOH produces 1 mol of OH⁻ ion, thus the number of moles of OH⁻ is 0.17391

3. Resulting solution

Number of moles of OH⁻ ions = 0.10944 mol + 0.17391 mol = 0.28335 mol

Volume of solution = 0.304 liter + 0.341 liter = 0.645 liter

Molar concentration = 0.28335 mol / 0.645 liter = 0.4393 M

4. pOH

$pOH=-\log [OH^-]=-\log (0.439)=0.36$ ← answer

5 0

3 years ago