The correct scientific notation form of the number 5,489.6654 using only 2 significant figures is: 5.5 * 10³
Scientific notation is a way to represent very large or very small numbers in a more concise and manageable format. It consists of two parts: a coefficient and an exponent of 10.
In your given number, 5,489.6654, we want to express it in scientific notation using only 2 significant figures. Significant figures are the digits in a number that contribute to its precision.
Identify the significant figures: From the given number, we have two significant figures, which are 5 and 4.
Determine the coefficient: To represent the number in scientific notation, we want the coefficient to be between 1 and 10. In this case, we can round the number to 5.5 (rounding the 8 up).
Determine the exponent of 10: To express the number 5.5 in scientific notation, we need to move the decimal point in the original number to the right by one place.
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Answer:
5.4 × 10^3.
Explanation:
Not 5.49 × 10^3, 5.4 × 10^7, or 5.5 × 10^3.
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Answer:
Exothermic reaction
Explanation:
Notice that the energy component is located on the right side of the reaction. The right side is always known as the product side. Whenever energy is located there, the reaction is known to give off energy - essentially, we can say that energy is a product, as well. Reactions that give off energy are known as exothermic reactions.
On the other hand, if the energy component was located on the left side, or reactant side, of the equation, it would be known as an endothermic reaction.
Here, it's exothermic.
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Answer: Heat equation
c. 2-methylpropane
b. 2,2-dimethylbutane
d. 2,2-diethylpropane
The compound that is a structural isomer of butane is 2 – methylpropane. Note that butane has four carbon atoms. In 2 – methylpropane, propane has three carbon atoms and methyl is attached at the second carbon. Methyl has only one carbon atom and together, they have a total of four carbon atoms. An isomer is a substance that has the same number of atoms but they differ in their structure. The answer is letter C.
Answer:
The prefix is but-.
Explanation:
"A molecule of a compound contains a total of 10 hydrogen atoms and has the general formula CnH2n+2.Which prefix is used in the name of this compound?
A) but- B) dec- C) oct- D) pent"
Hydrocarbons are compounds that contain only carbon and hydrogen. They are divided into aliphatic and aromatic hydrocarbons.
In aliphatic hydrocarbons, carbon atoms form open chains and are classified as alkanes, alzenes or alkenes, and alcines or alkynes.
Alkanes have only simple bonds between carbon atoms. The general formula for aliphatic (straight-chain) alkanes is CₙH₂ₙ₊₂.
Alkenes are hydrocarbons that have a carbon-carbon double bond in their molecule, and that is why they are called unsaturated. The generic formula is CₙH₂ₙ.
Alkynes have a triple bond between two carbon atoms. Its general formula is CₙH₂ₙ.
So in this case, you know that it is an alkane. To name an alkane, you must know the number of carbons n. For that you know that the compound has 10 hydrogens. That is, 2n + 2 must be 10. Then you can calculate the value of n:
2*n+2=10
2*n=10 -2
2*n=8
n=8÷2
n=4
So, in this case, the prefix is but-.