b. acetone
c. formaldehyde
d. arsenic
Answer:
b is the correct answer for e2020
Answer:
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
Explanation:
We need to convert each value into moles, a count of the number of atoms/molecules.
a) 1.0 moles He
b) 0.60 moles H2
c) 20 grams K: convert to moles with the molar mass of K
(20 grams K)/(39.1 g/mole K) = 0.511 moles K
d) 8.5 mL H2O (density of H2O = 1 g/mL).
Find the mass of the H2): (8.5 ml)*(1 g/ml) = 8.5 grams H2)
Now calculate moles H2): (8.5 grams)/(18 grams/mole) = 0.473 moles H2O
e) 22.6 g KMnO4
(22.6 g KMnO4 )*(158.0 g/mole) = 0.143 moles
Now we need to take into account the number of atoms per molecule:
Molecule Atoms/Molecule Moles Atoms(moles)
He 1 1.0 1.0
H2 2 0.60 1.2
K 1 0.51 0.51
H2O 3 0.47 1.41
KMnO4 6 0.143 0.86
The H2O sample has the greatest number of atoms. 1.41 moles, or (1.041 moles)*(5.023x10^23) atoms
O2 only
MgO only
Mg and O2
Mg only
Selenium tetrafluoride (SeF4) is a molecule characterized by a covalent bond, not an ionic bond. This bond is formed by the sharing of electron pairs between selenium and fluorine atoms.
The question we have here asks, Is selenium tetrafluoride an ionic or covalent bond?
Selenium tetrafluoride, otherwise known as SeF4, is a molecule formed by the chemical bonding of selenium and fluorine. This bonding is not ionic in nature, but covalent. When you hear the term covalent bond, it refers to a bond formed by the sharing of electron pairs between atoms. Here, selenium and four fluorine atoms share their electrons, therefore creating a molecule of selenium tetrafluoride via a covalent bond.
#SPJ2
Selenium tetrafluoride (SeF4) is a covalent bond because it involves the sharing of electrons between two nonmetals, selenium and fluorine. This contrasts ionic bonds, which typically involve a metal donating electrons to a nonmetal.
Selenium tetrafluoride, identified by the chemical formula SeF4, is a type of covalent bond. This classification is due to the fact that selenium and fluorine are both nonmetals. In chemistry, when two nonmetals form a compound, they usually share electrons, resulting in a covalent bond. The electrons are shared because each atom wants to achieve a stable setup, often attained with a full outer shell. Therefore, these compounds are described as covalent or molecular. An example of an ionic bond, on the other hand, involves a metal and a nonmetal. In this type of bond, the metal will lose electrons to become a positively charged cation, while the nonmetal will gain these same electrons to become a negatively charged anion.
#SPJ6
(a) Reticular Lamina
The layer of the basement membrane of epithelial tissues that is produced and secreted by cells of the underlying connective tissue is (a) Reticular Lamina.
The basement membrane is composed of two layers: the basal lamina, which is produced by the epithelial cells themselves, and the reticular lamina, which is produced and secreted by cells of the underlying connective tissue. These two layers together provide structural support and help anchor the epithelial tissue to the underlying connective tissue.