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2 years ago

HELP NOW!!

Chemistry

2 answers:

pishuonlain [190]2 years ago

6 0

Answer:

A and D

Explanation:

Bess [88]2 years ago

3 0

Alkaline Earth Metals are the elements located in the second period from the left of the periodic table. These elements lose two electrons to form the stable octet when forming an ionic bond, resulting in a net charge of +2. Because they’re trying to get rid of those electrons to get to the stable octet, it’s easy to remove them - this means that the ionization energy of these elements is relatively low. Finally, since they’re looking to get rid of electrons, they certainly aren’t trying to gain any, meaning that their electronegativity is relatively low.

The correct answers are A and D.

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How do you solve (1 x 1025) =3 x 10

Mrrafil [7]

Hey There!!~

Your best answer choice is 10280 or 10,280.

Because, 1 x 1025 = 1025 + 3 = 1028 x 10 = 10280 or 10,280.

Hope This Helps....!!

4 0

2 years ago

Read 2 more answers

The average atomic weight of copper, which has two naturally occurring isotopes, is 63.5. One of the isotopes has an atomic weig

Darya [45]

<u>Answer:</u> The atomic weight of the second isotope is 64.81 amu.

<u>Explanation:</u>

Average atomic mass of an element is defined as the sum of atomic masses of each isotope each multiplied by their natural fractional abundance

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$ .....(1)

We are given:

Let the mass of isotope 2 be 'x'

Mass of isotope 1 = 62.9 amu

Percentage abundance of isotope 1 = 69.1 %

Fractional abundance of isotope 1 = 0.691

Mass of isotope 2 = 'x'

Percentage abundance of isotope 2 = 30.9%

Fractional abundance of isotope 2 = 0.309

Average atomic mass of copper = 63.5 amu

Putting values in equation 1, we get:

$\text{Average atomic mass of copper}=[(62.9\times 0.691)+(x\times 0.309)]$

$x=64.81amu$

Hence, the atomic weight of second isotope will be 64.81 amu.

4 0

2 years ago

How many electrons are in Na+

musickatia [10]

Answer:

Explanation:

10 ELECTRONS ARE IN

Na+

5 0

2 years ago

Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. What is the expected value for the he

photoshop1234 [79]

Answer: 35.1 kJ/mol

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

$CH_3COOH(s)\rightarrow CH_3COOH(l)$ $\Delta H_{fusion}=10.8kJ/mol$ (1)

$CH_3COOH(l)\rightarrow CH_3COOH(g)$ $\Delta H_{vap}=24.3kJ/mol$ (1)

The final reaction is:

$CH_3COOH(s)\rightarrow CH_3COOH(g)$ $\Delta H_{sub}=?$ (3)

By adding (1) and (2)

$\Delta H_{sub}=\Delta H_{fusion}+\Delta H_{sub}=+10.8kJ+(+24.3kJ)=35.1kJ$

Hence the expected value for the heat of sublimation of acetic acid is 35.1 kJ/mol

6 0

3 years ago

4. Define power and explain how to determine power.

Ratling [72]

The rate of doing work is called power of an object.
It is also defined as the work done by an object per unit time. Mathematically, its formula is given by :
, W is work done and t is time taken.
The SI unit of power is watts and its commercial unit is kWh.
1 watt = J/s or N-m/s.

5 0

2 years ago