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2 years ago

Why do elements in the same colum have similar properties?

Chemistry

1 answer:

den301095 [7]2 years ago

6 0

Answer:because they have the same number of valence electrons

Explanation:

Valence electrons determine reactivity.

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6. What happens to the arrangement of water molecules as ice melts?

miv72 [106K]

Answer:

D. Molecules are able to move as they heat up to melt

Explanation:

3 0

2 years ago

What is 1 third divided by 5<br>

madreJ [45]

1/15 is the correct answer I think

5 0

2 years ago

Convert 3.09 x 10~3 m = nm

Dmitriy789 [7]

3090000000nm

since there's 1m = 1000000000nm

6 0

3 years ago

A hypothetical metal crystallizes with the face-centered cubic unit cell. The radius of the metal atom is 234 picometers and its

AleksAgata [21]

Answer:

$\delta=101.13 g/cm^3$

Explanation:

As can be seen in the Figure in a face-centered cubic unit cell you have:

Six halves of atoms
Eight 1/8 of atom (1 in each corner)

In total:

$n_{atom}=6*0.5+8*\frac{1}{8}=4 atoms$

Now, each side of the cell is 234 picometers (2.34e-8 cm) long

$V_{cell}=L^3=(2.34e^{-8} cm)^3$

$V_{cell}=1.28*10^{-23}cm^3$

Atoms per cm3:

$n=\frac{4 atoms}{1.28*10^{-23}cm^3}$

$n=3.12*10^{23} atoms/cm^3$

Expressing in mass:

$\delta=3.12*10^{23} atoms/cm^3* \frac{1 mol}{6.022*10^{23}}*195.08 g/mol$

$\delta=101.13 g/cm^3$

6 0

3 years ago

If a 0.4681 g Mg strip reacts with 0.650 M HCl in a 139.3 mL flask at 25oC, what is the minimum volume (mL) of HCl needed to com

Marizza181 [45]

The reaction between the magnesium, Mg, and the hydrochloric acid, HCl is given in the equation below,

Mg + 2HCl --> H2 + MgCl2

The number of moles of HCl that is needed for the reaction is calculated below.
n = (0.4681 g Mg)(1 mol Mg/24.305 g Mg)(2 mol HCl/1 mol Mg)
n = 0.0385 mols HCl

From the given concentration, we calculate for the required volume.
V = 0.0385 mols HCl/(0.650 mols/L)
V = 0.05926 L or 59.26 mL

<em>Answer: 59.26 mL of HCl</em>

7 0

2 years ago