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timofeeve [1]
3 years ago
15

1. Energy is expended when a force moves matter across a distance. True/False

Chemistry
1 answer:
Novosadov [1.4K]3 years ago
8 0
1. True
2. True
3. False
4. True
5. True

3. Heat can be thought of as the movement of particles (molecules etc). The faster they move the hotter things are. Energy of movement is called kinetic energy. Temperature is a measure of the average kinetic energy of the particles, while thermal energy is the total kinetic energy of the particles.
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Theory is often used as a synonym for idea in everyday life.
Rasek [7]
I think B. As an idea is just a way that could be possible
8 0
3 years ago
Plz help asap What can you conclude about the iron(ii) and iron(iii) ions?
zavuch27 [327]

Answer:

The chemistry of iron is dominated by the +2 and +3 oxidation states i.e. iron(II) and iron(III) complexes e.g. Fe2+ and Fe3+ complex ions with selected ligands, usually of an octahedral shape, a few tetrahedral iron(III) complexes are mentioned too. The reactions of the aqueous ions iron(II) and iron(III) with ammonia, sodium hydroxide and sodium carbonate are described and explained as are complexes of iron(III) with the chloride ion and cyanide ion.

principal oxidation states of iron, redox reactions of iron, ligand substitution displacement reactions of iron, balanced equations of iron chemistry, formula of iron complex ions, shapes colours of iron complexes, formula of compoundsExplanation:

5 0
3 years ago
In a solution of salt and water which compound is the solute?
ra1l [238]
Solute is what gets dissovled, in this case the salt, and the solVENT is whatever a material is dissolved into, in this case the water.
7 0
3 years ago
Determine the molality of a solution of benzene dissolved in toluene (methylbenzene) for which the mole fraction of benzene is 0
kogti [31]

Answer:

2.32 m

Explanation:

So, according to definition of mole fraction:

Mole\ fraction\ of\ benzene=\frac {n_{benzene}}{n_{benzene}+n_{toluene}}

Mole fraction = 0.176

Applying values as:

0.176=\frac {n_{benzene}}{n_{benzene}+n_{toluene}}

0.176\times ({n_{benzene}+n_{toluene}})={n_{benzene}}

So,

0.176\times n_{toluene}}=0.824\times {n_{benzene}}

{n_{benzene}}=\frac {0.176}{0.824}\times n_{toluene}}

{n_{benzene}}=0.2136\times n_{toluene}}

Also, Molar mass of toluene = 92.14 g/mol

Thus,

The formula for the calculation of moles is shown below:

moles = \frac{Mass\ taken}{Molar\ mass}

Mass=92.14\times n_{toluene}}\ g

Also, 1 g = 0.001 kg

So,

Mass\ of\ toluene=0.09214\times n_{toluene}}\ kg

Molality is defined as the moles of the solute present in 1 kg of the solvent.

It is represented by 'm'.

Thus,  

Molality\ (m)=\frac {0.2136\times n_{toluene}}{0.09214\times n_{toluene}}

<u>Molality of benzene = 2.32 m</u>

3 0
3 years ago
How can you separate sand and sugar?
satela [25.4K]

Answer:

1)Filtration to remove sand

2)Evaporation to obtain sugar

Explanation:

Add water to the mixture and mix,sugar will dissolve.

Filter out the sand.

Evaporate the remaining solution to obtain the sugar.

7 0
3 years ago
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