A. magnesium carbonate I

True/False. Water is a polar molecule, which means, it has a negative end and a positive end.

Dominik [7]

Answer: true it is polar

Explanation:

7 0

3 years ago

Read 2 more answers

a teacher divides her class into groups and assigns each group a task of measuring the mass of the same object three times.the t

RoseWind [281]

Answer:

This question lacks options, the options are:

A. Group C: 32.1 g, 35.0 g, 25.0 g

B. Group B: 25.5 g, 25.0 g, 24.8 g

C. Group A: 28.5g, 28.4 g, 28.5 g

D. Group D: 20.0 g, 25.0 g, 30.09

The answer is C. GROUP A

Explanation:

Precision in measurements refers to the degree of closeness between the repeated or measured values irrespective of how close they are to the true or accepted value, which is 25g in this case.

The precision of a measurement can be determined by simply finding the range (highest - lowest) of the measurements. The lowest range represents the most precise. The measurements for each group are:

Group C: 32.1 g, 35.0 g, 25.0 g

Range = 35.0 - 25.0 = 10g

Group B: 25.5 g, 25.0 g, 24.8 g

Range = 25.5 - 24.8 = 0.7g

Group A: 28.5g, 28.4 g, 28.5 g

Range: 28.5 - 28.4 = 0.1g

Group D: 20.0 g, 25.0 g, 30.09

Range = 30.09 - 25.0= 5.09g

Based on the ranges of the measurements in each group, one would notice that Group A has the lowest range (0.1g), hence, GROUP A is the most precise.

6 0

3 years ago

What are the acceptable solution to the Schrodinger wave equation <br>

alex41 [277]

Answer:

The wave function Ψ(x, t) = Aei(kx−ωt) represents a valid solution to the Schrödinger equation. The wave function is referred to as the free wave function as it represents a particle experiencing zero net force (constant V )

7 0

2 years ago

What is the molality of a solution consisting of 44.0 mL of benzene (C₆H₆; d = 0.877 g/mL) in 167 mL of hexane (C₆H₁₄;d = 0.660

STALIN [3.7K]

Molarityof the solution will be 907.35 m.

<h3>What is Molality?</h3>

Molaity is the no. Of moles of an compound is present in 1 kg solution .

Molality= no.0f moles / mass of the solution (in kg)

The SI unit of molality is m .

We have given here ,

Volume of benzene= 44.0ml

Density of benzene =0.877g/ mol

Volume of hexane =167 ml

Density of hexane =0.660g/ mol

Mass of benzene = 44×0.877

. →38.588 g

Mass of hexane→167×660

. → 110.220g

mass of the solution→148.808g

molar mass of the solution→78+ 86

. →164g/ mol

Molality = 148.808/ 164×1000

→907.35m

So , molality will be 907.35 m

to learn more about Molality click here brainly.com/question/26921570

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7 0

2 years ago

There are many minerals which contain silver. A 2.00 g sample of one of these, stephanite, is placed in water and all of its sil

Nata [24]

Answer:

68.3%

Explanation:

First, let us look at the equation of reaction involving silver and magnesium chloride:

2Ag + MgCl2 ----> 2AgCl + Mg

1 mole of MgCl2 is required to precipitate 2 moles of Ag completely from the solution. That is a ratio of 1 to 2.

Now, mole of MgCl2 used to precipitate all the Ag

= molarity x volume

= 2.19 M x 2.89/1000

= 0.0063291 mole

Since 1 mole of MgCl2 would always require 2 moles of Ag, 0.0063291 mole will therefore require:

0.0063291 x 2 = 0.0126 mole of Ag

This means that 0.0126 mole of Ag is present in stephanie.

Mass of silver in stephanie = mole x molar mass

= 0.0126 x 107.8682

= 1.365 g

Thus, 1.365 g of silver is present in 2.00 g sample of stephanie.

Mass percent of silver in stephanie = 1.365/2.00 x 100

= 68.25% = 68.3% to the correct number of significant figure.

4 0

3 years ago