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strojnjashka [21]
3 years ago
11

Most substances can exist as a solid, liquid, or gas depending on ? ( science

Chemistry
2 answers:
earnstyle [38]3 years ago
3 0

Answer:

The amount of energy in molecules of matter determines the state of matter.

Explanation:

The amount of energy in molecules of matter determines the state of matter. Matter can exist in one of several different states, including gas, liquid, or solid-state.

Tju [1.3M]3 years ago
3 0

Answer:

The state of a substance depends on the space between its particles and on the way in which the particles move. The more solid it is the tighter the particles.

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Consider the aldol-dehydration reaction. Draw the two possible products of the reaction between benzaldehyde and methylethylketo
Dafna1 [17]

Solution :

An $\text{aldol condensation}$ reaction is a type of \text{condensation reaction} in organic chemistry where the enol or an enolate ion reacts with the carbonyl compound and forms a $\beta$-hydroxyaldehyde or a $\beta$-hydroxyketone, and then followed by a dehydration to give conjugated enone.  

Benzaldehyde reacts with methylketone and forms two products:  

5 0
3 years ago
What is the symbol for an ion with a 3+ charge, 28 electrons, and a mass number of 71
zhenek [66]

Answer:

Ga3+ is a gallium cation

7 0
3 years ago
Given the following at 25C calculate delta Hf for HCN (g) at 25C. 2NH3 (g) +3O2 (g) + 2CH4 (g) ---> 2HCN (g) + 6H2O (g) delta
AysviL [449]

<u>Answer:</u> The \Delta H_f for HCN (g) in the reaction is 135.1 kJ/mol.

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. The equation used to calculate enthalpy change is of a reaction is:

\Delta H_{rxn}=\sum [n\times \Delta H_f(product)]-\sum [n\times \Delta H_f(reactant)]

For the given chemical reaction:

2NH_3(g)+3O_2(g)+2CH_4(g)\rightarrow 2HCN(g)+6H_2O(g)

The equation for the enthalpy change of the above reaction is:

\Delta H_{rxn}=[(2\times \Delta H_f_{(HCN)})+(6\times \Delta H_f_{(H_2O)})]-[(2\times \Delta H_f_{(NH_3)})+(3\times \Delta H_f_{(O_2)})+(2\times \Delta H_f_{(CH_4)})]

We are given:

\Delta H_f_{(H_2O)}=-241.8kJ/mol\\\Delta H_f_{(NH_3)}=-80.3kJ/mol\\\Delta H_f_{(CH_4)}=-74.6kJ/mol\\\Delta H_f_{(O_2)}=0kJ/mol\\\Delta H_{rxn}=-870.8kJ

Putting values in above equation, we get:

-870.8=[(2\times \Delta H_f_{(HCN)})+(6\times (-241.8))]-[(2\times (-80.3))+(3\times (0))+(2\times (-74.6))]\\\\\Delta H_f_{(HCN)}=135.1kJ

Hence, the \Delta H_f for HCN (g) in the reaction is 135.1 kJ/mol.

8 0
3 years ago
Identify which subatomic particles match each of these descriptions. Specifically, determine whether the following descriptions
iren2701 [21]

Answer:

1. Protons

2. Electrons

3. Neutrons

4. Protons and neutrons

5. Electrons

Explanation:

The protons are the only positive sub-atomic particles and the have a charge of +1.

The Electrons are the only negative subatomic particles and they have a charge of -1

Neutrons do not have any charge but they have the same mass as the protons

The nucleus of an atom is where most of the atomic masses are concentrated and it houses the neutrons and protons

The electrons reside outside the nucleus and they have a much more lesser mass compared to the neutrons and protons

5 0
3 years ago
An _______ bond forms when a cation transfers its extra electron to an anion who needs it.
Nitella [24]
An c.ionic  bond forms when a cation transfers its extra electron to an anion who needs it.
For example compound magnesium chloride (MgCl₂) has ionic bond (<span>the </span>electrostatic attraction<span> between oppositely charged </span><span>ions)</span>. Magnesium transfers two electrons (became positive cation) to chlorine (became negative anion).
5 0
3 years ago
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