Please help me with this question

If after heating the reaction between magnesium and hydrochloric acid, the mass of the magnesium chloride and beaker is measured

Allushta [10]

Since the beaker was heated we can asume that only magnesium cloride is left in the beaker, therfore the difference between the beaker with magnesium chloride and the empty beaker give the mass of magnisium chloride:

$\text{mass MgCl}_2=massbeakerwithMgCl_2-mass\text{ emprty beaker =37.83 g - 33.95g = 3.8}8g$

7 0

1 year ago

What property is primarily responsible for determining the type of electromagnetic energy and peak wavelength emitted by a star

svetoff [14.1K]

The answer i think it is... is Temperature
Hope this helped!

6 0

3 years ago

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What relationship exists between the mass number of an element and the isotopes of that element?

labwork [276]

The mass number plays an important role for elements and their isotopes. Mass number comes from the addition of protons and neutrons (their weight). Isotopes are the elements, but with a different number of neutrons. So in turn, by subtracting the number of protons (atomic number) from the mass, you can find the number of neutrons.

8 0

3 years ago

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Chemistry! Help! Please!! Thanks

Vladimir79 [104]

Answers:

1. 3-ethyl-3-methylheptane; 2. 2,2,3,3-tetramethylpentane; 3. hexa-2,4-diene.

Explanation:

Structure 1

Identify and name the longest continuous chain of carbon atoms (the main chain has 7 C; ∴ base name = heptane).
Identify and name all the substituents [a 1C substituent (methyl) and a 2C substituent (methyl).
Number the main chain from the end closest to a substituent.
Identify the substituents by the number of the C atom on the main chain. Use hyphens between letters and numbers (3-methyl, 3-ethyl).
Put the names of the substituents in alphabetical order in front of the base name with no spaces (3-ethyl-3-methylheptane)

Structure 2

5C. Base name = pentane
Four methyl groups.
Number from the left-hand end.
If there is more than one substituent of the same type, identify each substituent by its locating number and use a multiplying prefix to show the number of each substituent. Use commas between numbers (2,2,3,3-tetramethyl).
The name is 2,2,3,3-tetramethylpentane.

Structure 3

Identify and name the longest continuous chain of carbon atoms that passes through as many double bonds as possible. Drop the -ne ending of the alkane to get the root name hexa-.
(No substituents).
Number the main chain from the end closest to a double bond.
If there is more than one double bond use a multiplying prefix to indicate the number of double bonds (two double bonds = diene) and use the smaller of the two numbers of the C=C atoms as the double bond locators (2,4-diene)
Put the functional group name at the end of the root name (hexa-2,4-diene).

Note: The name 2,4-hexadiene is acceptable, but the Preferred IUPAC Name puts the locating numbers as close as possible in front of the groups they locate.

7 0

3 years ago

Which of the following molecules would you expect to have a dipole moment of zero? a,CH2 Ch3

Vadim26 [7]

Answer: The molecule $CH_{3}-CH_{3}$ is expected to have a dipole moment of zero.

Explanation:

The product of magnitude of the charge calculated in electrostatic units is called dipole moment.

Formula for dipole moment is as follows.

Dipole moment = Charge (in esu) $\times$ distance (in cm)

Non-polar molecules have zero dipole moment.

For example, $CH_{3}-CH_{3}$ is a non-polar molecule so its dipole moment is zero.

$H_{2}C=O$ is a polar molecule so it will have dipole moment.

$CH_{2}Cl_{2}$ is a polar molecule so it will have dipole moment.

$NH_{3}$ has nitrogen atom as more electronegative than hydrogen atom. So, net dipole moment will be in the direction of nitrogen atom.

Thus, we can conclude that the molecule $CH_{3}-CH_{3}$ is expected to have a dipole moment of zero.

4 0

3 years ago