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Assoli18 [71]
3 years ago
8

If you don't know all the answers just answer the ones you do know and number them so I know which one you are answering

Chemistry
2 answers:
BlackZzzverrR [31]3 years ago
6 0
2. answer is C.<span> Elements have the same physical and chemical properties in any period </span>
-Dominant- [34]3 years ago
6 0
1.which of the following characteristics was NOT included in Dmitri Mendeleev's periodic table

D. Distribution of elements determined by electron configuration 

2. According to the periodic law what is the relationship between elements and periods 

C. Elements have the same physical and chemical properties in any period

3. Which of these sets of elements has similar properties consult the periodic table 

A.Strontium, magnesium, calcium, beryllium
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How might sharing data gathered by different regions allow scientists to better predict the weather.
Assoli18 [71]
By sharing data from different regions, this allows scientists to better predict the weather. Weather travels in patterns. If it is raining in England there is a chance it will rain in Germany. This all has to do with the wind patterns
3 0
3 years ago
A piece of lead loses 78.0 J ofheat and experiences a decrease in temperature of 9.0C the specific heat of lead is .130J/gC what
Ratling [72]
The  mass of  the piece  of  lead   is    calculated  using the  below  formula
Q(heat)= mC delta T

Q = 78.0  j
M=mass =?
C=specific heat capacity (   0.130 j/g/c
delat T=change in temperature =  9.0 c

by  making  M  the  subject  of  the formula
M = Q/ c delta T

M=  78.0 j/ 0.130 j/g/c  x  9.0 c =  66.7 g  of  lead
3 0
3 years ago
How does anatomy provide evidence for evolution?<br><br> I'll give brainlist!! Simple answer please.
mel-nik [20]
Anatomical evidence of evolution focuses on similarities and differences in the body structures of different species. ... Similarities in anatomical structures of different species signify that the two species have a relatively recent common ancestor.
4 0
3 years ago
What mass of Na2SO4is needed to make 2.5 L of 2.0 Msolution? (Na = 23 g; S = 32 g; O = 16 g)
ivanzaharov [21]

Answer:

mass (g) needed = 710.2 grams Na₂SO₄(s)

Explanation:

Needed is 2.5 Liters of 2.0M Na₂SO₄; formula wt Na₂SO₄ = 142.04g/mol.

mass (grams) of Na₂SO₄(s) = Molarity needed x Volume needed in Liters x Formula Wt of solute

mass (grams) of Na₂SO₄(s) = (2.5L)(2.0M)(142.04g/mol) = 710.2 grams Na₂SO₄(s)

Mixing: Transfer 710.4 grams Na₂SO₄ into mixing vessel and add water-solvent up to but not to exceed 2.5 Liters total volume. Mix until dissolved.

Gives 2.5 Liters of 2.0M Na₂SO₄(aq) solution.

5 0
2 years ago
ccording to the Bohr model of the atom, when an electron goes from a higher-energy orbit to a lower-energy orbit, it ________ el
marishachu [46]

Answer:

1. Absorbs electromagnetic energy

2. Energy difference between the two orbits.

Explanation:

Bohr precisely describe the processes of absorption and emission of energy in terms of electronic structure. According to Bohr's model, an electron would absorb energy in the form of photons to get excited to a higher energy level as long as the photon's energy was equal to the energy difference between the initial and final energy levels. After jumping to the higher energy level or the excited state, the excited electron would be in a less stable position, so it would quickly emit a photon to relax back to a lower, more stable energy level.

7 0
3 years ago
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