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marysya [2.9K]
3 years ago
13

It's important to remember that elements are

Chemistry
2 answers:
DIA [1.3K]3 years ago
6 0

Answer:

i used a vent to vented

Explanation:

miv72 [106K]3 years ago
3 0

No, unless you're doing some sort of course where they demand that you do. It's useful to remember the general features of the periodic table (what each block is, where they are in relation to each other, roughly where the most common elements are), but memorizing the entire thing would simply be a mnemonic exercise

Hope this helped

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A sample has a mass of 1.2 g and a volume of 1.1 cm? What is the density of this sample?
mamaluj [8]

Answer:

Density is a physical quantity, defined as the ratio of body mass to the volume occupied by this body.  The average body density is the ratio of body weight to its volume.

Since the mass in a body can be distributed unevenly, a more adequate model defines the density at each point of the body as a derivative of mass over volume.

Thus, to obtain the density of a sample, its mass must be divided by its volume. Thus, the density of the sample is 1.2 / 1.1, that is, 1.09 g/cm3.

7 0
3 years ago
How many moles of cabr2 are in 5.0 grams of cabr2?
worty [1.4K]
Moles of CaBr2 = 5/molar mass of CaBr2 
                          =  5/199.886
                          = 0.025 moles.

Hope this helps!
3 0
3 years ago
Read 2 more answers
Which of the following chemical reactions is an oxidation-reduction reaction? Fe2O3 + 3CO yields 2Fe + 3CO2 MgSO4 + 2KIyields K2
Elodia [21]
I hope I am right on this, but the answer is
Fe₂O₃ + 3CO --> 2Fe + 3CO₃
5 0
3 years ago
Read 2 more answers
An electron confined in a one-dimensional box is observed, at different times, to have energies of 12 eV, 27 eV, and 48 eV. What
Fynjy0 [20]

Answer:

l=3.5*10^{-10}m

Explanation:

From the question we are told that:

1st Energy     E_1=12eV=4(3eV)

2nd Energy  E_2=27eV=9(3eV)

3rd Energy   E_3=48eV=16(3eV)

 

Generally the equation for Energy E for electron in one dimensional box at ground state E_0 is mathematically given by

  E_0=\frac{h}{8ml^2}

  E_0=\frac{h}{8ml^2}

Therefore Length a is mathematically given as

l=\sqrt{\frac{h^2}{8mE_0} }

l=\sqrt{\frac{(6.625*10^{-34})^2}{8(9.1*19^{-31}{(3eV(1.6*10^{-19}))}}

l=3.5*10^{-10}m

8 0
3 years ago
The least polar bond is found in a molecule of hi hf hcl hbr
mario62 [17]

Answer:

HI is least polar

Explanation:

5 0
3 years ago
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