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3 years ago

10 To draw a perfect circle, you'll need: A A protractor B. A sextant С A compass D A spirograph 10 of 10

Chemistry

1 answer:

mestny [16]3 years ago

7 0

Answer:

Explanation:

Two quick google searches later I grace you with the google has bestowed upon me

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Trava [24]

Answer: 2.52 M

Explanation:

The product of molarity (moles/litre) and volume in litres yields moles, and the numbers of moles in two solutions means dilute and concentrated are equal, which is expressed by the following equation:

$M_1V_1=M_2V_2$

$$Given that\\M $1=12.0 \mathrm{M}$ or mole $/ \mathrm{L}$\\$\mathrm{V} 1=420 \mathrm{ml}$\\$\mathrm{M} 2=$ ?\\$\mathrm{V} 2=2.0 \mathrm{~L}$ or $2000 \mathrm{ml}$\\\\$\mathrm{M} 1 \mathrm{~V} 1=\mathrm{M} 2 \mathrm{~V} 2$\\$\mathrm{M} 2=\mathrm{M} 1 \mathrm{~V} 1 / \mathrm{V} 2$\\$=12.0 * 420 / 2000$\\$=2.52 \ \mathrm{M}$

3 0

2 years ago

Remodeling a kitchen to add additional cabinets to existing ones also means adding extra support. In a similar respect, bone rem

krok68 [10]

Answer:

Calcium (Ca²⁺)

Explanation:

Calcium is very important mineral, found in teeth and bones primarily.

It is needed for the strong bones.

It is very important to maintain the bones in order to support our skeleton.

In our body it is also important to carry out other functions like in muscles, nerve function and also for heart.

If our diet is not full of calcium, the calcium deficiency may occur which leads to the weakening of bones and cause fracture.

The dietary source of calcium includes:

Yogurt, cheese, milk

beans such as peas, peanuts.

fishes

almonds, oranges, molasses

5 0

3 years ago

If you are given the molarity of a solution, what additional information would you need to find the weight/weight percent (w/w%)

Ludmilka [50]

Answer:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

Explanation:

Hello,

In this case, since molarity is mathematically defined as the moles of solute divided by the volume of solution and the weight/weight percent as the mass of solute divided by the mass of solution, we need:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

For instance, if a 1-M solution of HCl has a density of 1.125 g/mL, we can compute the w/w% as follows:

$w/w\%=1\frac{molHCl}{L\ sln}*\frac{36.45gHCl}{1molHCl}*\frac{1L\ sln}{1000mL\ sln}*\frac{1mL\ sln}{1.125g\ sln} *100\%\\\\w/w\%=3.15\%$

Whereas the first factor corresponds to the molar mass of HCl, the second one the conversion from L to mL of solution and the third one the density to express in terms of grams of solution.

Regards.

4 0

2 years ago

Calculate the bond energy per mole for breaking all the bonds in methane, CH4. Express your answer to four significant figures a

lesantik [10]

The energy that is essential to break one C-H bond is 414 kJ/mol. Since, there are four C-H bonds in CH4, the energy Δ HCH4 for breaking all the bonds is calculated as Δ HCH4 = 4 x bond energy of C-H bond. By multiplying the 4 with the 414 kJ/mol you can get the answer of 1656 kJ/mol CH4 molecules.

4 0

3 years ago

Read 2 more answers

What is smaller than one cell

mr_godi [17]

The organelles and substances inside the organelles are smaller. On a molecular level a group that are smaller are hadrons, which are the group of particles that consist of protons and neutrons. Even smaller than hadrons are leptons, which consist of neutrinos, electons, and MANY others.

6 0

3 years ago

10 To draw a perfect circle, you'll need: A A protractor B. A sextant С A compass D A spirograph 10 of 10​

10 To draw a perfect circle, you'll need: A A protractor B. A sextant С A compass D A spirograph 10 of 10