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3 years ago

The atomic number of lead is 82. Its mass number is 207?.how many protons neutrons and electros does the atom of lead contain

Chemistry

1 answer:

kupik [55]3 years ago

4 0

Lead have:

82 electrons

82 protons

125 neutrons

Explanation:

The number of electrons and protons are given by the atomic number of the element.

Lead have 82 electrons and 82 protons.

The number of neutrons are given by the difference between the mass number and atomic number.

For lead number of neutrons = 207 - 82 = 125.

Learn more about:

particles in the atom

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In the laboratory you dissolve 15.9 g of barium chloride in a volumetric flask and add water to a total volume of 375 ml. what i

ASHA 777 [7]

There are a number of ways to express concentration of a solution. This includes molarity. Molarity is expressed as the number of moles of solute per volume of the solution. So, we calculate as follows:

Molarity = 15.9 g BaCl2 ( 1 mol / 208.23 g ) / .375 L = 0.204 mol / L

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3 years ago

Which of the following are physical characteristics of blood? 1. it is more viscous than water 2. its temperature is about 38ºC

yawa3891 [41]

Explanation:

A property which does not bring any change in chemical composition of a substance is known as physical property.

For example, blood is more viscous than water, its pH is slightly alkaline, its temperature is about $38^{o}C$ ( $100.4^{o}F$ ) .

On the other hand, a property which changes chemical composition of a substance is known as a chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

Sometimes, the change in color of a substance can also occur due to a chemical change.

Thus, we can conclude that following are the physical characteristics of blood.

it is more viscous than water.

its temperature is about $38^{o}C$ ( $100.4^{o}F$ ).

the pH is slightly alkaline.

it is about 8% of one’s total body weight.

6 0

3 years ago

Which polyatomic ion is found in the compound represented by the formula NaHCO3?

olga nikolaevna [1]

Answer is (2) - hydrogen carbonate

Explanation:

NaHCO₃ is an ionic compound which is made from Na⁺ and HCO₃⁻ ions. The decomposition is

NaHCO₃ → Na⁺ + HCO₃⁻

Among the resulted ions, Na⁺ is a monatomic ion while HCO₃⁻ is a polyatomic ion.

Polyatomic ions mean ions which are made of two or more different atoms.

HCO₃⁻ is made from 3 atoms as H, C and O. The name of HCO₃⁻ ion is bicarbonate or hydrogen carbonate.

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3 years ago

Plants and animals add carbon dioxide to the atomsphere when they ____ glucose.

labwork [276]

A! Oxidize. Hope this helps!

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3 years ago

Calculate the Density of the substances below to determine if they will float or sink in water.

Reil [10]

Explanation:

If the density of the object is more than that of water, it will sink. Otherwise it will float. The density of water is 1 g/mL.

Substance 1,

Mass, m = 450 g, Volume, V = 90 mL

Density = mass/volume

So,

$d_1=\dfrac{450}{90}\\\\=5\ g/mL$

It will sink.

Substance 2,

Mass, m = 35 g, Volume, V = 70 mL

Density = mass/volume

So,

$d_2=\dfrac{35}{70}\\\\=0.5\ g/mL$

It will float.

Substance 3,

Mass, m = 24 g, Volume, V = 12 mL

Density = mass/volume

So,

$d_3=\dfrac{24}{12}\\\\=2\ g/mL$

It will sink.

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3 years ago