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3 years ago

How many valance electrons are there? List them

Chemistry

1 answer:

stellarik [79]3 years ago

3 0

Explanation:

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Which of the following ions/atoms has the smallest radius?

Anna11 [10]

Answer:

B I believe im sorry if it's not right

8 0

3 years ago

1. If the water is not completely removed from the salt during the heating process will the reported water-to-salt mole ratio (X

Vitek1552 [10]

Answer:

The water in the hydrate (referred to as "water of hydration") can be removed by heating the hydrate. When all hydrating water is removed, the material is said to be anhydrous and is referred to as an anhydrate.

Explanation:

4 0

3 years ago

Need to complete the chart

GalinKa [24]

Answer:

Row 1

$[H^+]=1.8\times 10^{-6}M$

$pH=-\log[H^+]=-\log[1.8\times 10^{-6}]=5.7$

pOh=14-pH=14-5.7=8.3

$pOH=-\log[OH^-]$

$[OH^-]=0.5\times 10^{-8}M$

Hence, acidic

Row 2

$[OH^-]=3.6\times 10^{-10}M$

$pOH=-\log[OH^-]=-\log[3.6\times 10^{-10}]=9.4$

pH=14-pOH=14 - 9.4 = 4.6

$pH=-\log[H^+]$

$[H^+]=2.6\times 10^{-5}M$

Hence, acidic

Row 3

pH = 8.15

$[H^+]=0.7\times 10^{-8}M$

pOH=14-pH=14 - 8.15 = 5.8

$pOH=-\log[OH^-]$

$[OH^-]=1.5\times 10^{-6}M$

Hence, basic

Row 4

pOH = 5.70

$[OH^-]=1.8\times 10^{-6}M$

pH=14-pOH=14 - 5.70 = 8.3

$pH=-\log[H^+]$

$[H^+]=0.5\times 10^{-8}M$

Hence, basic

3 0

4 years ago

A sample of metal has a mass of 24.64 g, and a volume of 5.91 mL. What is the density of this metal?

dlinn [17]

Answer:

$\boxed {\boxed {\sf 4.17 \ g/mL}}$

Explanation:

We are asked to find the density of a metal. Density is the mass per unit volume. It is calculated by dividing the mass by the volume.

$\rho= \frac{m}{v}$

The mass of the metal sample is 24.64 grams and the volume is 5.91 milliliters. We can substitute these values into the formula.

m= 24.64 g
v= 5.91 mL

$\rho=\frac{24.64 \ g }{5.81 \ mL}$

Divide.

$\rho= 4.169204738 \ g/mL$

The mass measurement has 4 significant figures the volume measurement has 3 significant figures. Our answer for density must match the least number of significant figures, which is 3.

For the number we calculated, that is the hundredth place. The 9 in the thousandth place tells us to round the 6 up to a 7.

$\rho \approx 4.17 \ g/mL$

The density of this metal is approximately <u>4.17 grams per milliliter.</u>

3 0

3 years ago

Calculate the frequency of a ray of light with an energy of 5.5 x 10-19 joules

Akimi4 [234]

Answer:

f = 0.83 ×10¹⁵s⁻¹

Explanation:

Given data:

Energy of ray = 5.5 ×10⁻¹⁹ J

Frequency = ?

Solution:

Formula:

E = hf

f = E/h

J = Kg . m².s⁻²

f = 5.5 ×10⁻¹⁹ Kg . m².s⁻² / 6.63 ×10⁻³⁴ m²Kg/s

f = 0.83 ×10¹⁵s⁻¹

7 0

3 years ago