Answer:
1.4 g/cm³
Step-by-step explanation:
1. Calculate the <em>volume of the block</em>
V = lwh
<em>Data:
</em>
l = 150 cm
w = 0.20 m
h = 6.0 mm
(a) Convert all units to a <em>common base
</em>
w = 0.20 m × (100 cm/1 m)
w = 20 cm
h = 6.0 mm × (1 cm/10 mm)
h = 0.6 cm
<em>Calculation:
</em>
V = lwh
V = 150 × 20 × 0.60
V = 1800 cm³
2. Calculate the <em>density
</em>
Density = mass/volume
<em>Data:
</em>
m = 2.5 kg
<em>Calculation:
</em>
m = 2.5 kg Convert to grams
m = 2.5 kg × (1000 g/1 kg)
m = 2500 g
Density = 2500 g/1800 cm³
Density = 1.4 g/cm³
Answer:
5.12 molecules of Ag₂S could be produced from 10 molecules of silver.
Explanation:
Given data:
Molecules of Ag = 10 molecules
Molecules of Ag₂S = ?
Solution:
First of all we will convert the number of molecules into gram.
10/ 6.022 ×10²³ = 1.7 × 10⁻²³ mol
Mass of Ag:
Number of moles = mass/ molar mass
Mass = Number of moles × molar mass
Mass = 1.7 × 10⁻²³ mol × 107.9 g/mol
Mass = 183.43 × 10⁻²³ g
Chemical equation:
2Ag + H₂S → Ag₂S + H₂
Now we will compare the moles of silver with Ag₂S from balanced chemical equation.
Ag : Ag₂S
2 : 1
1.7 × 10⁻²³ : 1/2 ×1.7 × 10⁻²³ = 0.85 × 10⁻²³ mol
Molecules of Ag₂S:
0.85 × 10⁻²³ × 6.022 ×10²³ = 5.12 molecules
Answer:
Explanation:
Question 1:
atomic number/number of protons
All atoms of the same element share the same number of protons or atomic numbers. In grouping elements on the periodic table, the periodic law is often used. The modern periodic law states that "properties of elements are a periodic function of their atomic number". The atomic number of an element distinguish it from others.
Question 2:
The two carbon atoms would be quite different as they are isotopes. Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.
Naturally, carbon exists in two isotopic forms:
¹³₆C and ¹⁴₆C
One might see these different samples in a rock and in the skin cells. They are simply isotopes. Isotopes have the same electronic configuration and hence similar chemical properties. Only their masses differ.
Answer:
One billion
Explanation:
A nanometer is a BILLIONTH of a meter which means it takes one billion to equal a meter
When the molecule undergoes chlorination with Cl2 on heating, the hydrogen atom of the alkyl group is replaced by the chlorine atom and form chloroalkanes. The molecule X containes three types of alkyl halides, therefore three different types of chloroalkanes are formed by the replacement of hydrogem atom linked to these alkyl groups. Thus the three different types of chloroalkanes are formed - primary, secondary, and thertiary chloroalkane. Chlorination is not selective so a mixture pf products results. The products formed by the reaction of the molecule with Y with Cl2 are shown on the attached file.
