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AfilCa [17]
3 years ago
5

Which two rocks contain the mineral quartz?

Chemistry
1 answer:
Goshia [24]3 years ago
3 0

Answer:

3. Granite and Gneiss.

Gneiss is a coarse to medium grained banded metamorphic rock formed from igneous or sedimentary rocks during regional metamorphism. Banded gneisses called migmatites are composed of alternating light colored layers of granite or quartz feldspar and dark layers rich in biotite.

Granite is a purely natural stone that comes directly from stone quarries and is then cut into thin slabs, polished, and fabricated into countertops. So-called quartz countertops are engineered stone products that may contain a large percentage of natural quartz but may also include other minerals.

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If 33.9g NaCl are mixed into water and the total mass is 578g, what is the CHANGE in freezing if Kb= - 1.82C/M (molal)? Assume N
steposvetlana [31]

Answer:

-1.82 °C

Explanation:

Step 1: Given data

  • Mass of NaCl (solute): 33.9 g
  • Mass of water (solvent): 578 g = 0.578 kg
  • Freezing point depression constant for water (Kb): -1.82 °C/m

Step 2: Calculate the molality of the solution

We will use the following expression.

m = mass of solute / molar mass of solute × kg of solvent

m = 33.9 g / 58.44 g/mol × 0.578 kg

m = 1.00 m

Step 3: Calculate the freezing point depression (ΔT)

The freezing point depression is a colligative property that, for a non-dissociated solute, can be calculated using the following expression:

ΔT = Kb × m

ΔT = -1.82 °C/m × 1.00 m

ΔT = -1.82 °C

3 0
3 years ago
The actual yield of a product in a reaction was measured as 1.20 g. If the theoretical yield of the product for the reaction is
Nimfa-mama [501]

Answer:

The answer to your question is letter A. 65.9%

Explanation:

Data

actual yield = 1.20 g

theoretical yield = 1.82 g

Formula

percentage yield = \frac{actual yield}{theoretical yield} x 100

Substitution

percentage yield = \frac{1.20}{1.82} x 100

Simplification and result

percentage yield = 0.6593 x 100

percentage yield = 65.9 %

7 0
4 years ago
Chlorine has two naturally occurring isotopes, ³⁵Cl and ³⁷Cl. What is the mass number of each isotope? How many protons, neutron
Arte-miy333 [17]

The mass number of ³⁵Cl and ³⁷Cl is 35 and respectively.

<h3>What is atomic mass? </h3>

Atomic mass is defined as the sum of number of protons and number of neutrons of an element.

Atomic mass is represented by A.

<h3>What is Atomic number?</h3>

Atomic number is defined as the number of electron in an element.

Atomic number is represented by Z.

<h3>What is Isotopes? </h3>

Isotopes are the element which have same atomic number but have different atomic mass.

Number of proton is equal to number of electrons.

Proton is positively charged, electrons are negativity charge while neutrons are neutral in nature.

Proton and neutrons are present in the nucleus of an element. On the other hand, electron revolves around the nucleus.

The atomic number of ³⁵Cl and ³⁷Cl is 17.

Number of protons = Number of electrons = 18.

Neutrons = atomic mass - atomic number

Neutrons of ³⁵Cl = 35-17 = 18

Neutrons of ³⁷Cl= 37- 17= 20

So, they have different atomic mass and number of neutrons.

Thus, we concluded that the mass number of ³⁵Cl and ³⁷Cl is 35 and 37 respectively.

learn more about atomic mass:

brainly.com/question/14250653

#SPJ4

6 0
2 years ago
Which two factors does the power if a machine depend on
Furkat [3]

The definition of mechanical power is


                       Power = (work done) / (time to do the work).


From that definition, it looks pretty much like the power of a machine

depends on work and time.


8 0
4 years ago
Read 2 more answers
Give types of salts and one example each<br>​
Dmitry_Shevchenko [17]

Answer:

sodium chloride

Explanation:

table salt

sea salt

koshea salt

5 0
3 years ago
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