The atom then has more protons than electrons and so it will be positively charged a positive ion Example: A magnesium atom may lose two electrons and become a Mg2+ ion. Non-metal atoms may gain electrons and become negatively charged. ... (It loses two electrons.)
Answer:
lAs can be seen from the chemical equation, each mole of
F
e
2
C
O
3
needs 3 moles of
C
O
. If 30 moles of
C
O
are used, only 10 moles of
F
e
2
C
O
3
can be reduced, generating 20 moles of
F
e
, corresponding to 1117 grams of iron.
Solution: Sentence D is a scientific statement.
Scientific statement is a statement that defines the science behind any situation. There should be any experimental result or observation to state any scientific statement. Also, the statement should be accepted by considering other scientific aspects.
Here, statement A can not be a scientific statement as different aromas of cooked food are liked by different people. Any one can find aroma of cooked food in copper better than the ceramic pot.
Thus, the statement can be proved wrong easily.
Statement B can not be a scientific statement as people can find the taste of normal water (without ice cubes) better than the ice cold water.
Statement C is not a scientific statement as there is no science behind watching baseball or ice hockey, it depends on the liking of today's people.
Statement D is a scientific statement because this can be scientifically proved.
Answer: Animals found in the Arctic tundra include herbivorous mammals (lemmings, voles, caribou, arctic hares, and squirrels), carnivorous mammals (arctic foxes, wolves, and polar bears), fish (cod, flatfish, salmon, and trout), insects (mosquitoes, flies, moths, grasshoppers, and blackflies), and birds (ravens, snow buntings
Explanation:
Equation for the given reaction is as follows.
![HA(aq) + NaOH(aq) \rightarrow NaA(aq) + H_{2}O(l)](https://tex.z-dn.net/?f=HA%28aq%29%20%2B%20NaOH%28aq%29%20%5Crightarrow%20NaA%28aq%29%20%2B%20H_%7B2%7DO%28l%29)
Therefore, moles of NaOH and HA are calculated as follows.
Moles of NaOH = ![0.256 M \times 0.03378 L](https://tex.z-dn.net/?f=0.256%20M%20%5Ctimes%200.03378%20L)
= ![8.64 \times 10^{-3}](https://tex.z-dn.net/?f=8.64%20%5Ctimes%2010%5E%7B-3%7D)
= 0.00864 mol
Moles of HA = 0.00864
Also, moles = ![\frac{\text{weight}}{\text{molecular weight}}](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7Bweight%7D%7D%7B%5Ctext%7Bmolecular%20weight%7D%7D)
Molecular weight =
= 122.22 g/mol
Thus, we can conclude that molar mass of given unknown organic acid is 122.22 g/mol.