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Anestetic [448]
3 years ago
14

What term describes a substance that is formed from chemical combinations of two or more different elements?

Chemistry
2 answers:
kakasveta [241]3 years ago
7 0

Answer:

2. Compounds

Explanation:

Compounds are substances formed when two or more elements are combined that are always present in fixed ratios. The elements are bonded together either through covalent or ionic bonding.

MrRa [10]3 years ago
6 0
A compound is a substance formed when two or more elements are chemically joined.
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If 2.1 moles of NaCl is dissolved in a solution with a total volume of 7.3 liters, what is the molarity of the solution? Round t
Arturiano [62]

Answer:

The molarity of the solution is 0.29 \frac{moles}{liter}

Explanation:

Molarity, or molar concentration, is a measure of the concentration of a solute in a solution, be it some molecular, ionic or atomic species. It is defined as the number of moles of solute that are dissolved in a given volume.

Molarity is calculated as the quotient between the number of moles of solutes and the volume of the solution:

Molarity=\frac{number of moles of solute}{volume}

Molarity is expressed in units \frac{moles}{liter}.

In this case:

  • number of moles of solute= 2.1 moles
  • volume= 7.3 liters

Replacing:

Molarity=\frac{2.1 moles}{7.3 liters}

Molarity= 0.29 \frac{moles}{liter}

<u><em>The molarity of the solution is 0.29 </em></u>\frac{moles}{liter}<u><em></em></u>

5 0
3 years ago
Read 2 more answers
What are other ways plants reproduce themselves
Svet_ta [14]
Not every plant grows from a seed. Some plants, like ferns and mosses, grow from spores. Other plants use asexual vegetative reproduction and grow new plants from rhizomes or tubers. We can also use techniques like grafting or take cuttings to make new plants.
6 0
3 years ago
At which concentration of glucose carriers was the glucose concentration reduced to zero?
Agata [3.3K]
Had to look for the options and here is the answer. The concentration of glucose carriers in which the glucose concentration is being decreased to zero is 400. This level is already classified as above normal of the rate of glucose concentration. Hope this helps.
8 0
3 years ago
The decomposition of 57.0 g of Fe2O3 results in Consider the following reaction. 2Fe2O3 ---&gt; 4Fe + 3O2 deltaH degree rxn = +
lozanna [386]

Answer:

The correct answer is option E.

Explanation:

2Fe_2O_3\rightarrow 4Fe + 3O_2 \Delta H^o_{rxn} = 824.2 kJ

Mass of ferric oxide decomposed = 57.0 g

Moles of ferric oxide decomposed = \frac{57.0 g}{160 g/mol}=0.35625 mol

According to reaction, 2 moles ferric oxide on combustion gives 824.2 kJ of heat.

Then heat given by on decomposition of 0.35625 mol of ferric oxide will be:

\frac{824.2 kJ}{2}\times 0.35625 =146.81 kJ\approx 147 kJ

So, on decomposition of 57.0 grams of ferric oxide 147 kilo Joules of heat was released.

3 0
3 years ago
What is the pressure exerted by 68.0 g of nitrogen trihydride gas in a 50.0L container at 30.0 C?
Cloud [144]

Answer:

Molecular mass of NH3 = ( 14 + 3 ) = 17 g

PV =  \frac{m}{m _{r}} RT \\ P \times 50.0 \times  {10}^{ - 6}  =  \frac{68.0}{17}  \times 8.314 \times (30.0 + 273) \\ P =  \frac{68.0 \times 8.314 \times 303}{17 \times 50.0 \times  {10}^{ - 6} }  \\ P = 2.02 \times  {10}^{8}  \: Pascals

8 0
3 years ago
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