A solid precipitate is formed from the reaction of lead nitrate and sodium chromate. What would be the best method to separate this solid from the solution?
distillation
evaporation
filtration
sorting

Answers

Answer 1

Answer: I believe it's Filtration.

Answer 2

Answer: the correct answer would be filtration

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What kind of bond is in the picture

Answers

Answer:

Ionic Bond

Explanation:

Ionic bonding occurs when there is a significant difference in electronegativity between atoms, resulting in the transfer of electrons. In the case of magnesium (Mg) and oxygen (O), magnesium, with a lower electronegativity, donates two electrons to oxygen, which has a higher electronegativity. This leads to the formation of Mg²⁺ cations and O²⁻ anions. The resulting electrostatic attraction between these oppositely charged ions forms an ionic bond, resulting in the creation of magnesium oxide (MgO), a compound with a crystal lattice structure.

Under which conditions of temperature and pressure would helium behave most like an ideal gas?(1) 50 K and 20 kPa (3) 750 K and 20 kPa
(2) 50 K and 600 kPa (4) 750 K and 600 kPa

Answers

Answer : The correct option is, (3) 750 K and 20 kPa

Explanation :

The conditions for ideal gas are :

Ideal gas are those gas that has no intermolecular attractions.

Ideal gas are those gas that have negligible volume.

The ideal gas equation is,

$PV=nRT$

The conditions for real gas are :

Real gas are those gas that have intermolecular attractions.

Real gas are those gas that have volume.

The real gas equation is,

$(P+(an^2)/(V^2))(V-nb)=nRT$

A real gas behave ideally at high temperature and low pressure condition.

From the given options, option (3) have high temperature and low pressure is the correct option.

Hence, at 750 K and 20 kPa conditions of temperature and pressure does a sample of helium behave most like an ideal gas.

Which equation represents sublimation?1) $Hg_((l))\to Hg_((s))$
2) $NH_(3(g))\to NH_(3(l))$
3) $H_2O_((s)) \to H_2O_((g))$
4) $CH_(4(l)) \to CH_(4(g))$

Can someone help me with this one ?

Answers

Answer is 3) - H₂O(s) → H₂O(g)

Sublimation can be defined as the type of phase conversion of a substance which is in its solid phase to a gaseous phase without going through its liquid phase.

According to the given choices only third one is correct because solid H₂O goes to its vapor without going liquid state.

Third one because sublimation is changing from solid to gas

Which equations shows the complete dissociation of a strong base?

Answers

The correct answer is the fourth option. The complete dissociation of a strong base is BOH + h20 -> B+ + OH- + H20 since this is the only base from the choices given. A base is a substance that accepts hydrogen ions.

Atoms of which types of elements tend to gain electrons? Atoms of which types of elements tend to lose electrons?

Answers

Atoms of elements that are nonmetals tend to gain electrons and atoms of metallic elements tend to lose electrons. Metals have few electrons in their valence shells.By losing those electrons, these metals achieve noble gas configuration and satisfy the octet rule.Nonmetals that have close to 8 electrons in their valence shells readily accept electrons to achieve noble gas configuration.An example is the reaction between calcium and oxygen. Calcium is a metal and has 2 valence electrons. Oxygen is a nonmetal and has 6 valence electrons.Calcium gives up its two valence electrons and oxygen accepts them and an ionic bond is established resulting in the formation of anew compound namely calcium oxide.

Final answer:

Nonmetals, such as those in groups 14 and 17, generally gain electrons becoming more stable anions. Metals, like those in group 1, typically lose electrons and form stable cations. An example is in ionic compounds where metal atoms like sodium lose electrons and nonmetal atoms like chlorine gain electrons.

Explanation:

In the context of elements and their atoms, nonmetals, which include elements from group 14 and group 17, tend to gain electrons. This gain in electrons forms negative ions, or anions, which fills their outermost electron shell, making them energetically more stable.

On the other hand, metals like those from group 1, tend to lose electrons. This event makes them energetically more stable by forming positive ions, or cations, and allowing them to achieve an electron configuration similar to noble gases.

For instance, to fill their outermost shells, elements donate or accept electrons. In ionic compound formation, metals like sodium (Na) lose electrons while nonmetals like chlorine (Cl) gain these electrons, achieving a stable configuration.