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3 years ago

A scientist is combining two grey elements he thinks he will get a compound why is this prediction wrong

2 answers:

4 0

In a compund, the proportion must be fixed, unlike mixture. Therefore, if he just combine two elements, there must be excess elements mixed in it.
Second, how did he combined two elements? In order to create a compund, either heat or electricity must be applied.
Therefore, even if he used heat / electricity, he still hasn't got the right proportion, therefore he must have mixed some excess elements into the compund that he thought he made.

Alex_Xolod [135]3 years ago

4 0

Answer: The combination of two grey elements will lead to the formation of molecule of element.

Explanation:

Element is defined as the substance having similar kind of atoms.

Compound is defined as the substance having different kind of atoms.

Molecules of elements are defined as the substances which are made up of similar type of atoms. For Example: $F_2$ etc..

Molecules of compounds are defined as the substances which are made up of different type of atoms. For Example: $CO_2$ etc..

We are given:

Two grey elements are combining to form a molecule. The molecule formed is known as molecule of element because 2 same kind of elements are combining.

Hence, this will lead to the formation of molecule of element.

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2 years ago

A 250.0 mL sample of aqueous solution contains an unknown amount of dissolved NaBr. Excess aqueous Pb(NO3)2is then added to this

Scrat [10]

Answer:

A. 0.0655 mol/L.

B. PbBr2.

C. Pb2+(aq) + Br- --> PbBr2(s).

Explanation:

Balanced equation of the reaction:

Pb(NO3)2(aq) + 2NaBr(aq) --> PbBr2(s) + 2NaNO3(aq)

Number of moles

PbBr2

Molar mass = 207 + (80*2)

= 367 g/mol.

Moles = mass/molar mass

= 3.006/367

= 0.00819 mol.

Since 2 moles of NaBr reacted to form 1 mole of PbBr2. Therefore, moles of NaBr = 2*0.00819

= 0.01638 moles of NaBr.

Since, the ionic equation is

NaBr(aq) --> Na+(aq) + Br-(aq)

Since 1 moles of NaBr dissociation in solution to give 1 mole of Br-

Therefore, molar concentration of Br-

= 0.0164/0.25 L

= 0.0655 mol/L.

PbBr2

Pb(NO3)2(aq)--> Pb2+(aq) + 2No3^2-(aq)

2NaBr(aq) --> 2Na+(aq) + 2Br-(aq)

Net ionic equation:

Pb2+(aq) + 2Br- --> PbBr2(s)

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3 years ago

A que temperatura se produce el punto de fusión

Sholpan [36]

Answer:

Explanation:

At what temperature does the melting point occur?

32°F /0°C

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At temperatures above 32°F (0°C), pure water ice melts and changes state from a solid to a liquid (water); 32°F (0°C) is the melting point. For most substances, the melting and freezing points are about the same temperature.

Is Melting Point affected by temperature?

Melting point, the temperature at which the solid and liquid forms of a pure substance can exist in equilibrium. As heat is applied to a solid, its temperature will increase until the melting point is reached. More heat then will convert the solid into a liquid with no temperature change.

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3 years ago

What is the equilibrium expression for the reaction below?

Delvig [45]

Answer:

D. [CO₂]

Explanation:

Let's consider the following equation at equilibrium.

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3 years ago