In which compound is the percent by mass of oxygen greatest?A. BeO
B. MgO
C. CaO
D. SrO
Answers
Answer: BeO
Explanation:
percent by mass of oxygen
percent by mass of oxygen in BeO
percent by mass of oxygen in MgO
percent by mass of oxygen in CaO
percent by mass of oxygen in SrO
Hide the Oxygen for a minute
Mass of elements:
Be:9.012
Mg:24.305
Ca:40.078
Sr:87.62
Out of all these choices, Be is the lightest
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77. 1 kilograms. What's The mass in grams
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the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
Answer:
the science or practice of farming, including cultivation of the soil for the growing of crops and the rearing of animals to provide food, wool, and other products.
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Answers
Magnesiumchloride is formed when a magnesium atom donates one electron each to two chlorine atomsto form magnesium ions and chloride ions.
What are ionic compounds?
Ionic compounds are compounds which are formed between oppositely charged ions.
The negatively-charged ions are formed by electron gain from the positively-charged ions.
In the magnesium chloride salt, a magnesium atom donates one electron each to two chlorine atoms.
The ions are held together by strong electrostatic forces of attraction to form the ionic compound.
Learn more about ionic compounds at: brainly.com/question/15724954
Answer:
The magnesium atom loses 2 electron to the 2 atoms of chlorine. The 7 valency electrons of each chlorine atom will now be 8 to attain stable configuration. The final compound is written as MgCl2.
Explanation:
Ionic compounds are compound formed from the transfer of electron(s). One atom of the element loses electron(s) while the other atom gains electron(s).
The compound Magnesium chloride is an ionic compound . The bond between an atom of magnesium and 2 atoms of chlorine is an ionic bonding.
The valency electron of magnesium is 2 electron , for the atom of magnesium to attain octet rule, it will easily lose it 2 electrons to the chlorine atoms.
The chlorine atom on the other hand has 7 valency electrons, to attain octet configuration it will most likely gain 1 electron to become stable.
The magnesium atom loses 2 electron to the 2 atoms of chlorine. The 7 valency electrons of each chlorine atom will now be 8 to attain stable configuration. The final compound is written as MgCl2.
first ionization energy
(1) decreases
(2) increases
(3) decreases, then increases
(4) increases, then decreases
Answers
Answer: The first ionization energy for the first five elements of Group 15 decreases.
Explanation:
Ionization energy is defined as the energy required to remove an electron from the outermost shell of an isolated gaseous atom. It is represented as
Ionization energy decreases as we move down the group. This happens because the number of shells increases as we move down the group. The electrons are added in the new shell around the nucleus.
This results in the shielding of outermost electrons more from the inner ones, which decreases the attraction between the outermost electrons and the nucleus. Hence, the removal of electron from the outermost shell becomes easy and requires less energy.
Hence, the first ionization energy for the first five elements of Group 15 decreases.
Answers
A copper penny has a mass of 6.2 grams and a volume of 0.70ml
Required:
density of the penny
Solution:
D = M/V where D is teh density, M is the mass and V is the volume
D = 6.2 grams/0.70 mL
D = 8.9 grams per milliliters
A: the Oxygen has a partial negative charge which attracts atoms and molecules that have a position or partial positive charge
B: The Hydrogen has a partial negative charge which attracts atoms and molecules that have a positive or partial positive charge
C: Because Oxygen is extremely electronegative it attracts atoms and molecules with a negative or partial negative charge
D: Because Hydrogen has a very low electronegative rating it attracts atoms and molecules with a positive or partial positive charge
Answers
Considering the definition of hydrogen bond, the correct answer is option A: he Oxygen has a partial negative charge which attracts atoms and molecules that have a position or partial positive charge.
In hydrogen bonds, a molecule that presents hydrogen interacts with another that presents an atom with high electronegativity, such as oxygen, fluorine or nitrogen (O, F, N). In this way, between the hydrogen, which has a low electronegativity and the electronegative atom, an interaction is established, due to their opposite charges.
On the other hand, electronegativity is the ability of an atom to attract shared electrons in a covalent bond.
In the case of water, because oxygen is more electronegative than hydrogen, electrons, which have a negative charge, are more likely to be closer to the oxygen atom than to the hydrogen atom, which causes each hydrogen atom to have a positive charge is called a positive partial charge, and that of oxygen, a negative charge, since it has the electrons closer together.
In summary, the correct answer is option A: he Oxygen has a partial negative charge which attracts atoms and molecules that have a position or partial positive charge.
Learn more:
Answer:
Opposite charges attract one another. The slight positive charges on the hydrogen atoms in a water molecule attract the slight negative charges on the oxygen atoms of other water molecules. This tiny force of attraction is called a hydrogen bond.