Select all that apply to the property of hardness.Hardness is a physical property
Hardness is indicative of the strength of chemical bonds between elements.
Hardness is determined through a complicated process that requires expensive instruments.
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.

Answers

Answer 1

Answer: The correct statements are:

Hardness is a physical property
Friedrich Mohs developed the standard hardness scale.
Diamond can scratch quartz.

Answer 2

Answer:

Answer:The properties of the Hardness are:

Hardness is a physical property
Hardness is indicative of the strength of chemical bonds between elements.
Diamond can scratch quartzExplanation:

Hardness is defined as resistance offered by a material when subjected to any kind of mechanical effort.It is a physical property

Hardness of a materiel indicates its strength that strength of its chemical bond between the atoms and their arrangement in space.

Mohs scale is a scale which measures the hardness of the materiel from 1 to 10. Materiel with higher Mohs scale number will able to scratch materiel with lower Mohs scale score.

The properties of the Hardness are:

Hardness is a physical property

Hardness is indicative of the strength of chemical bonds between elements.

Diamond can scratch quartz.

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Suppose the mole number of Ca2+ ions in a 50 mL water sample is quantified as 1.5 × 10−5 mol. What is the concentration of Ca2+ ions in the water sample in ppm CaCO3?

Answers

$(1.5x 10^(-5) mol Ca^(2+))/(50ml) ( (1 mol CaC O_(3) )/(1 mol Ca^(2+) ) )( (100,000 ppm)/(1 molCaC O_(3)/L ) ) \n =0.0300234$

Answer : The concentration of $Ca^(2+)$ ions in the water sample in ppm is, 12000 ppm

Solution : Given,

Moles of calcium = $1.5* 10^(-5)moles$

Molar mass of calcium = 40 g/mole

Volume of solution = 50 ml

First we have to calculate the mass of calcium.

$\text{Mass of calcium}=\text{Moles of calcium}* \text{Molar mass of calcium}=(1.5* 10^(-5)moles)* (40g/mole)=60* 10^(-5)g=6000mg$

(1 g = 1000 mg)

Now we have to calculate the concentration of calcium.

$\text{Concentration of calcium}=\frac{\text{Mass of calcium}* 1000}{\text{Volume of solution}}=(6000mg* 1000)/(50ml)=12000mg/L=12000ppm$

(1 ppm = 1 mg/L)

Therefore, the concentration of $Ca^(2+)$ ions in the water sample in ppm is, 12000 ppm

What type of chemical bond links the monomers in a polymer?

Answers

alkenes such as ethene have at least one double bond in their chains and these join to make a polymer called polyethene but alkanes like ethane have only single bonds

A triangular shaped body of water that forms where a stream in to the larger body of water is a

Answers

A triangular shaped body of water that forms where a stream in to the larger body of water is a delta.

Please take thetime to rate, pick the Brainliest answer (not necessarily mine!), and thank me if you feel Ihelped with this question! Thank you, it helps me a lot. :)

This triangular body of water is called a delta. It is shaped like the Greek letter delta and was coined by Herodotus, the father of history who lived from 484 to 425 BC by seeing the deltoid shape at the mouth of the Nile.

Deltas occur throughout the world except at the poles. They all have three things in common, namely:

1. The presence of a large catchment basin. The top 30 river deltas all have catchment basins.

2. They all are at the mouth of large river systems that carry large quantities of clastic sediments (soils or portions of rocks that have been moved by water from where they formed)

3. They are not found near geologically active coastlines. They take a long time to develop so they are very rarely situated on tectonically active coast.

Which element has the greatest density at stp? calcium, chlorine, carbon or copper?

Answers

density = mass/volume

Since at STP, one mole of any gas occupies 22.4 liters, therefore, the volume is equal.
So, we will arrange based on mass.

From the periodic table:
mass of carbon = 12 grams
mass of calcium = 40 grams
mass of chlorine = 35.5 grams
mass of copper = 63.5 grams

Based on this:
copper has the highest density.

The element that has maximum density at STP is copper.

Further explanation:

The property is a unique feature of the substance that differentiates it from the other substances. It is classified into two types:

1. Intensive properties:

These are the properties that depend on the nature of the substance. These don't depend on the size of the system. Their values remain unaltered even if the system is further divided into a number of subsystems. Temperature, refractive index, concentration, pressure, and density are some of the examples of intensive properties.

2. Extensive properties:

These are the properties that depend on the amount of the substance. These are additive in nature when a single system is divided into many subsystems. Mass, energy, size, weight, and length are some of the examples of extensive properties.

Density is a characteristic property of the substance. It is defined as the mass per unit volume. It is generally represented by $\rho$ .

The formula to calculate the density of the liquid is,

$\text{Density of liquid}(\rho)=\frac{\text{Mass of liquid(M)}}{\text{Volume of liquid (V)}}$

Standard Temperature and Pressure is denoted as STP and the volume of 1 mole of gas at STP is 22.4 litres.

The volume is constant and therefore density is directly related to mass.

Among the given elements copper has the highest molar mass and that is $63.5\;{\text{g/mol}}$ . Therefore the element that has maximum density at STP is copper.

Learn more:

1. Calculation of density: brainly.com/question/778841

2. Determine how many moles of water produce: brainly.com/question/1405182

Answer details:

Grade: Middle School

Subject: Chemistry

Chapter: Density

Keywords: density, mass, volume, STP, intensive, extensive, characteristic property, element, copper, chlorine, calcium, and carbon.

Which is NOT a difference between cytochrome C and ubiquinone (U)?A: U accepts e- from NADH, cytochrome C accepts e- from FADH2
B: U carries 2 e- and 2 H+, cytochrome C carries 1 e- and no H+
C: U pumps 2 H+ into IMM from matrix, cytochrome C pumps 1 H+

Answers

The correct Statement is B: U carries 2 e- and 2 H+, cytochrome C carries 1 e- and no H+. It claims that ubiquinone carries 2 electrons and 2 protons, whereas cytochrome C carries 1 electron and no protons, is not a difference between the two but a similarity.

The statement that is NOT a difference between cytochrome C and ubiquinone (U) is Option B: U carries 2 e- and 2 H+, cytochrome C carries 1 e- and no H+. This is because both molecules act as electron carriers, with ubiquinone carrying two electrons and two protons (H+), while cytochrome C can only carry one electron without carrying a proton.

Moreover, in Statement A and Statement C, ubiquinone and cytochrome c play different roles in the electron transport chain, therefore those statements describe actual differences between ubiquinone and cytochrome C.

To know more about Ubiquinone visit:-

brainly.com/question/32997771

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Which of the following is a nonmetal?a. iron
b. silver
c. oxygen
d. copper

Answers

Iron, Silver and Copper are all metal. Only Oxygen in this specific choices is not metal. Oxygen is known to be the 3rd most abundant element in the Universe but the 1st most abundant element on earth by mass. And we all know that Oxygen is a very essential part in our daily living in this world, actually not only humans who need Oxygen but also some creatures like animals. Oxygen is represented as O in the periodic table and its atomic number is 8.

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