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4 years ago

Dalton had the first idea of the atom true or false

Chemistry

1 answer:

Dennis_Churaev [7]4 years ago

6 0

Answer:

false

Explanation:

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What is the oxidation number of s in na2s4o6?

Novosadov [1.4K]

Answer:

+2.5

Explanation:

So the oxidation number of S in Na2S4O6is +2.5.

7 0

3 years ago

Read 2 more answers

The density of potassium, which has the BCC structure, is 0.855 g/cm3. The atomic weight of potassium is 39.09 g/mol. Calculate

Delicious77 [7]

Answer:

For a: The edge length of the crystal is 533.5 pm

For b: The atomic radius of potassium is 231.01 pm

Explanation:

For a:

To calculate the lattice parameter or edge length of the crystal, we use the equation:

$\rho=\frac{Z\times M}{N_{A}\times a^{3}}$

where,

$\rho$ = density = $0.855g/cm^3$

Z = number of atom in unit cell = 2 (BCC)

M = atomic mass of metal = 39.09 g/mol

$N_{A}$ = Avogadro's number = $6.022\times 10^{23}$

a = edge length of unit cell = ?

Putting values in above equation, we get:

$0.855=\frac{2\times 39.09}{6.022\times 10^{23}\times (a)^3}\\\\\a=5.335\times 10^{-8}cm=533.5pm$

Conversion factor: $1cm=10^{10}pm$

Hence, the edge length of the crystal is 533.5 pm

For b:

To calculate the edge length, we use the relation between the radius and edge length for BCC lattice:

$R=\frac{\sqrt{3}a}{4}$

where,

R = radius of the lattice = ?

a = edge length = 533.5 pm

Putting values in above equation, we get:

$R=\frac{\sqrt{3}\times 533.5}{4}=231.01pm$

Hence, the atomic radius of potassium is 231.01 pm

4 0

3 years ago

Which of the following statements demonstrates that the ocean is connected to all of Earth's water reservoirs through the proces

butalik [34]

B. This shows the process in which water can evaporate and poor again

7 0

3 years ago

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How can the rate of a reaction be decreased?

Agata [3.3K]

Reducing surface area

3 0

4 years ago

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Many metals undergo a single displacement reaction with hydrogen chloride (a strong acid, HCl). One example is magnesium, Mg. Th

Vesnalui [34]

Answer:

Mg(s) + 2HCl(aq) → MgCl2(s) + H2(g)

Explanation:

Many metal undergo displacement reaction . The most reactive metal will displace the less reactive metal from it compound. A single displacement reaction is a reaction in which one element displaces another in it compound.

Many metal undergo displacement reaction with hydrogen chloride . One example is magnesium. Magnesium will displace hydrogen in hydrogen chloride because it is more reactive than hydrogen. The displacement reaction is as follow

Mg(s) + HCl(aq) → MgCl(s) + H2(g). The balanced equation with the simplest whole number ratio is as follows

Mg(s) + 2HCl(aq) → MgCl2(s) + H2(g)

4 0

3 years ago