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MatroZZZ [7]
3 years ago
15

An atom of boron has an atomic number of 5 and an atomic mass of 11. The atom contains

Chemistry
1 answer:
dmitriy555 [2]3 years ago
3 0

Answer:

It is C.

Explanation:

The atomic mass = number  of protons + number of neutrons

= 5 + 6 = 11. The number of protons = the number of electrons.

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The barcoding process begins with
marusya05 [52]

Answer:

Explanation:

It starts with the company getting a GS1 Company Prefix Before a firm starts to use a barcode it has to come up with the GS1 Identification Keys which are the numbers that represent the company’s barcode. When the GS1 identification key is assigned, the firm acquires the GS1 Company Prefix that will enable the firm to create the identification keys for its goods, locations, trade items and coupons which will be unique to it worldwide.

8 0
3 years ago
What are three observable changes that show a chemical reaction?
adoni [48]

Answer:

Fizzing, New color, and odor

Explanation:This is because chemicals change the smell which can be called odor, chemicals change the color, and when something is fizzing their is a chemical reaction going on.

5 0
3 years ago
¿Cuántos moles hay en 350 g de NaNO3?
olga55 [171]

Answer:

3 moles

Explanation:

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4 0
2 years ago
A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing point depression o
Ludmilka [50]

Answer:

0.297 °C

Step-by-step explanation:

The formula for the <em>freezing point depression </em>ΔT_f is

ΔT_f = iK_f·b

i is the van’t Hoff factor: the number of moles of particles you get from a solute.

For glucose,

       glucose(s) ⟶ glucose(aq)

1 mole glucose ⟶ 1 mol particles     i = 1

Data:

Mass of glucose = 10.20 g

  Mass of water = 355 g

                 ΔT_f = 1.86 °C·kg·mol⁻¹

Calculations:

(a) <em>Moles of glucose </em>

n = 10.20 g × (1 mol/180.16 g)

  = 0.056 62 mol

(b) <em>Kilograms of water </em>

m = 355 g × (1 kg/1000 g)

   = 0.355 kg

(c) <em>Molal concentration </em>

b = moles of solute/kilograms of solvent

  = 0.056 62 mol/0.355 kg

  = 0.1595 mol·kg⁻¹

(d) <em>Freezing point depression </em>

ΔT_f = 1 × 1.86 × 0.1595

        = 0.297 °C

3 0
3 years ago
How many electrons are in 1 mole of carbon atoms?
Mkey [24]

Answer:

6 electrons

Explanation:

7 0
3 years ago
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