Answers
Answer:
1) Combustion
2)Synthesis
3)Single Replacement
4)Decomposition
5)Double Replacement
6)Synthesis
7)Double Replacement
8)Single Replacement
9)Combustion
10)Decomposition
Explanation:
Remeber, decomposisition is breaking things apart, synthesis is building them, cobusion will always make water and CO2 and will always burn O2, single replacemnt will have 1 thing replaced (single) and double replacement will have 2 things replaced (double).
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Related Questions
I NEED HELP ASAP !!!!
Answers
Answer:
5)A &D 6)B
Explanation:
Mass of Fe is 55.845 u
Mass of Cl is 35.453 u
And their sum is 91.298 u
How many moles is 7.78 x 1024
formula units of MgCl2?
Answers
How many moles is 7.78 x 1024
formula units of MgCl2?
answer: 7966.72
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, there are 0.49moles of MgCl[tex]_2[/tex] in 7.78 x 10²⁴atoms of MgCl[tex]_2[/tex] .
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
given number of atoms of MgCl[tex]_2[/tex]= 7.78 x 10²⁴
Substituting the values
mole= 7.78 x 10²⁴÷ 6.022×10²³
mole = 0.49moles of MgCl[tex]_2[/tex]
So, there are 0.49moles of MgCl[tex]_2[/tex] in 7.78 x 10²⁴atoms of MgCl[tex]_2[/tex] .
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Which type of rock is formed when rocks are melted deep in the Earth and cool to form new rocks?
A. Igneous
B. Metamorphic
C. Sandstone
D. Sedimentary
Answers
Igneous rocks are formed from melted rock deep inside the Earth. Sedimentary rocks are formed from layers of sand, silt, dead plants, and animal skeletons. Metamorphic rocks formed from other rocks that are changed by heat and pressure underground.
Answer:
igneous
Explanation:
key word: melt, cool. igneous rocks are when lava is melted then cooled off, then becoming a igneous rock.
A compound contains 25.94%N and 74.06% O by mass whats the empirical formula
Answers
Answer:
the answer is NO or nitric oxide.
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Explanation:
Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... Therefore, the empirical formula is NO[tex]_2[/tex].
What is Empirical formula?Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.
The relation between molecular formula and empirical formula can be given as
n= molecular formula÷ empirical formula
Number of gram atoms in compound and divide by smallest Number of gram atoms in compound
N=(25.94%)÷14=1.85/1.85=1
O=( 74.06% )÷16=4.62/1.85=2
The atomic ratio is 1:2
Whole number N:O is1:2
Empirical formula corresponding to this whole number is NO[tex]_2[/tex].
Therefore, the empirical formula is NO[tex]_2[/tex].
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