Answer:
Mass = 76.176 g
Explanation:
Given data:
Mass of lead(II) chloride produced = 62.9 g
Mass of lead(II) nitrate used = ?
Solution:
Chemical equation:
Pb(NO₃)₂ + 2HCl → PbCl₂ + 2HNO₃
Number of moles of lead(II) chloride:
Number of moles = mass/molar mass
Number of moles = 62.9 g/ 278.1 g/mol
Number of moles = 0.23 mol
Now we will compare the moles of lead(II) chloride with Pb(NO₃)₂ from balance chemical equation:
PbCl₂ : Pb(NO₃)₂
1 : 1
0.23 : 0.23
Mass of Pb(NO₃)₂:
Mass = number of moles × molar mass
Mass = 0.23 mol × 331.2 g/mol
Mass = 76.176 g
They are two different elements.
B.
They are two different compounds that include different elements.
C.
They are two different compounds that include the same elements in different arrangements.
D.
They are two different mixtures that include the same elements in different arrangements.
The answer to this question is C.
Answer:
Explanation:
Hydrogen peroxide is a chemical compound with the formula H₂O₂. In its pure form, it is a very pale blue liquid, slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic. Concentrated hydrogen peroxide, or "high-test peroxide", is a reactive oxygen species and has been used as a propellant in rocketry. Its chemistry is dominated by the nature of its unstable peroxide bond.
Chemical formula: H2O2
Density: 1.45 g/cm³
Boiling point: 302.36°F (150.20°C)
Average Molar mass: 34.01 g/mol
Melting point: 31.23°F (-0.43°C)
Legal status: Over-the-counter drug · Not evaluated by FDA
Water is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms. It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula is H₂O, meaning that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. Two hydrogen atoms are attached to one oxygen atom at an angle of 104.45°.
Boiling point: 212°F (100°C)
Melting point: 32°F (0°C)
Chemical formula: H2O
Average Molar mass: 18.02 g/mol
IUPAC ID: Water
Hydrogen peroxide(wiki)
Water(wiki)
So probably C or D i dont know
Sorry if it is wrong
what are the following?
lines the mucus membrane
increases blood flow
keeps the brain dry and warm
The mould and cast fossil is Option B.
The carbon film fossil is Option C.
The Amber fossil is Option A.
The ice fossil is Option D.
Mould and cast fossils are formed when an organism or any organic object gets buried inside sediment and gets decomposed off, leaving an empty space between the sediments which are occupied by different minerals like carbon, calcium, silica etc. Thus, this mineral takes the shape of that decomposed object and stays for years.
The carbon film fossils are those fossils which take long time to form and are difficult to recover as well. They are formed when some organic substance gets very deep into Earth's surface and gets burned by the interior lava into only a thin layer of carbon.
The amber fossils are very common which are formed when the living organisms get stuck in plant resins and dies, which are enclosed into the plant's resin and are recovered thousands of years after.
The ice fossils aren't actually fossil because in very cold regions, the dead bodies often don't decompose but remain as it is for years. Thus the soft tissues are also recoverable after many years.