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Norma-Jean [14]
4 years ago
5

We use the periodic table to determine a mineral’s hardness true or false

Chemistry
2 answers:
Ray Of Light [21]4 years ago
6 0
False we use it to determine what type of element it is as well as the atomic mass and number
Bas_tet [7]4 years ago
3 0
False we use it to detirmine the reactivitys and what groups they are in
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0.225L solution of H2CO3 is neutralized by 0.0880L of a 1.22 M Fe(OH)3 solution. What
ikadub [295]

Answer:

0.716

Explanation:

First, write the balanced equation:

3 H2CO3 + 2 Fe(OH)3 ----> Fe2(CO3)3 + 6 H2O

Second, go from the molarity of H2CO3 to liters of Fe(OH)3

(Pull mole ratio from balanced equation)

1.22/1L  x  0.0880/1  x  3molH2CO3/2molFe(OH)3 x 1/0.225L

Use calculator, and you end up with 0.7157333

Round to 0.716

6 0
3 years ago
Which of these electron transitions correspond to absorption of energy and which to emission?
Monica [59]

The energy will be absorbed for the electron transitions n= 3 to n= 4.

There are two ways in which electrons can transition between energy levels:

  1. Absorption spectra: This type of spectra is seen when an electron jumps from a lower energy level to a higher energy level. In this process, energy is absorbed.
  2. Emission spectra: This type of spectra is seen when an electron jumps from a higher energy level to a lower energy level. In this process, energy is released in the form of photons.

for n=3 to n=4,  the equation used to calculate the energy of transition is,

E = - 2.178×10⁻¹⁸J ( 1 / ni² - 1/nf ²)

Thus, for n = 3 to n = 4, as the electron is getting jumped from lower energy level (n = 3) to higher energy level (n = 4), the energy will be absorbed.

For more information about absorption visit the link:

brainly.com/question/14649237?referrer=searchResults

#SPJ4

3 0
2 years ago
What is the expression for the equilibrium constant for the<br> reaction N2+ 3H2 = 2NH3?
emmainna [20.7K]

Answer:

For the reaction N2 + 3H2 2NH3 , the equilibrium expression may be written as K [ NH3 ]^2/ [ N2 ] [ H2 ]^3 .

Explanation:

6 0
3 years ago
Read 2 more answers
You should _____ when you are giving an oral presentation. A. hide your purpose B. use a humorous tone C. avoid drawing clear co
zhannawk [14.2K]
D. make eye contact with the audience
8 0
3 years ago
Read 2 more answers
How does water cause weathering of a rock?​
klio [65]

Answer:

water wears it down over time, eroding it and weathering it. This usually happens to rocks in creekbeds or near bodies of water

hope this helps :)

Explanation:

7 0
3 years ago
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