What ions are in water all the time?
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Answer:
(Ca2 +, Mg2 +, Na+, and K+) and four major anions ( , , SO 4 2 - , and Cl-) with ionic forms of N, P, Fe, and other trace elements at lower concentrations (Livingstone 1963, Meybeck 1979) (Table 4.7).
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B Bromine gas reacts with a solution of potassium chloride to form potassium bromide and chlorine gas.
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Begin by balancing the equation:
2 Fe2O3 —> 4 Fe + 3 O2
Start your stoic:
(79.2g Fe2O3) <—- you start with what you have and always try to get rid of what unit you are at
Conversion to get rid of grams is
# grams over mole
^
This number comes from periodic table
Add whole mass of Fe2O3= 159.697g
(79.2g Fe2O3)(. mole. )
(159.697g)
Now get rid of moles, this is where you used the balanced numbers at the beginning
The number you are looking for goes on top—> (4 moles Fe)
(2 moles Fe2O3)
Last get mass of Fe alone and plug in to calc
Whole equation:
(79.2g)( moles)(4mFe)(55.85gFe)
(159.697)(2mole)(mole)
79.2 divides by 159.697 multiplied by 4 divided by 2 multipled by 55.85 equals 55.396406 rounded to:
55.4 g Fe
Answer: The mass of iron present is 55.40 g
Explanation:
We know that:
Molar mass of iron (III) oxide = 159.7 g/mol
Molar mass of iron = 55.85 g/mol
We are given:
Mass of iron (III) oxide = 79.2 g
To calculate the mass of iron in given amount of iron (III) oxide, we use unitary method:
In 159.7 grams of iron (III) oxide, the mass of iron is (2 × 55.85) = 111.7 g
So, in 79.2 grams of iron (III) oxide, the mass of iron will be =
Hence, the mass of iron present is 55.40 g
element
compound
atom
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The substance in the glass is a mixture.
Types of a mixture
A mixture is the combination of two or more substances that are not related leading to the formation of either uniformly or unevenly formed solution.
There are two main types of mixture which includes:
- Heterogeneous mixture: These are the type of mixture that are not evenly distributed. Example is the mixture of sand and water.
- Homogeneousmixture: This is the type of mixture that appears evenly or uniformly distributed. Example is mixture of water and salt.
Therefore, the mixture of salt and water is a homogeneous type of mixture.
Learn more about mixtures here:
More specifically a solution which is a homogeneous mixture.
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Final answer:
A charged group of covalently bonded atoms is known as a polyatomic ion or molecular ion; this is a group of atoms sharing electrons through covalent bonds and carrying an overall charge.
Explanation:
A charged group of covalently bonded atoms is known as a polyatomic ion or a molecular ion. These ions are formed when a group of atoms such as ammonium (NH4+), nitrate (NO3-), or sulfate (SO42-) share electrons through covalent bonds and also carry an overall charge. This net charge results from an excess or a deficiency of electrons compared to the total number of protons in the ion's atoms.
Learn more about Polyatomic Ions here:
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b. photon
c. electron
d. It depends on what the element is.
An atom with two protons, three neutrons and two electrons would have a mass of about how many atomic mass units?
a. 2
b. 3
c. 5
d. 7