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3 years ago

Periods, or horizontal rows, are arranged so that elements with similar properties fall into the same

Chemistry

1 answer:

icang [17]3 years ago

4 0

Horizontal is the correct one

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Can anyone answer these?

Maurinko [17]

Answer:

18 is a

19 is c

20 i am not sure

Explanation:

18)nucleus contains protons and neutrons

8 0

3 years ago

Part

Zielflug [23.3K]

NaOH (aq) + HCl(aq) => NaCl(aq)+ H2O(l)

Na+(aq)+ OH - (aq) + H +(aq) +Cl - (aq) + Cl- (aq)
=> Na+(aq) + Cl - (aq) + H2O(l)
H+(aq) + OH-(aq) => H2O(l)

6 0

3 years ago

Solid cesium iodide has the same kind of crystal structure as CsCl which is pictured below: If the edge length of the unit cell

Assoli18 [71]

The question is incomplete, here is the complete question:

Solid cesium iodide has the same kind of crystal structure as CsCl which is pictured below: If the edge length of the unit cell is 456.2 pm, what is the density of CsI in $g/cm^3$

The image is attached below.

Answer: The density of CsI is $9.09g/cm^3$

Explanation:

To calculate the density of metal, we use the equation:

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

where,

$\rho$ = density

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

M = atomic mass of CsI = 259.8 g/mol

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

a = edge length of unit cell = $456.2pm=456.2\times 10^{-10}cm$ (Conversion factor: $1cm=10^{10}pm$ )

Putting values in above equation, we get:

$\rho=\frac{1\times 259.8}{6.022\times 10^{23}\times (456.2\times 10^{-10})^3}\\\\\rho=9.09g/cm^3$

Hence, the density of CsI is $9.09g/cm^3$

3 0

3 years ago

What is another name for a homogeneous mixture

nasty-shy [4]

The term "solution" is more frequently used when a homogeneous mixture is a liquid, although it is sometimes used if the homogeneous mixture is a gas.

7 0

4 years ago

Read 2 more answers

A book club wants to raise $5,000 during a dinner fundraiser. The club members have sold 323 adult dinners at $10. 75 each. The

mina [271]

323 * $10.75 = $3472.25 → money raised from adult dinners

$5000 - $3472.25 = $1527.75 → money needed to reach $5000

$1527.75/$5.50 = 277.77 → 278 child dinners

6 0

2 years ago