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Nikolay [14]
3 years ago
13

What causes leaf shapes on a rock

Chemistry
1 answer:
sweet-ann [11.9K]3 years ago
7 0

Answer:

Leaf shapes on rocks are caused by leaves becoming fossilized.

Explanation:

When leaves are fossilized, like bones, they leave an imprint on the rock.

Please give brainliest!

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How is the separation of dna like a zipper
Sedbober [7]

The two strands must be separated like the two sides of a zipper, by breaking the weak hydrogen bonds that link the paired bases.

<u>Explanation:</u>

  • A double helix structure formed by two polypeptide chains is separated like the two sides of a zipper. A zipper is formed by breaking the weak hydrogen bonds that link the paired bases. During replication, an enzyme "Helicase" travels down the DNA and splits the chain and it forms 2 separate strands.
  • The two DNA strand which has the same sequence must be separated like the two sides of a zipper by breaking weak hydrogen bases. During base pair-rule, the strand are unzipped and each strands is copied.

     

3 0
3 years ago
The specific heat of water is 4.18 J/g•°C. How much heat does 225.0 g of water release when it cools from 85.5°C to 50.0°C? Ente
Sergio [31]
The answer is 33400J
4 0
3 years ago
Read 2 more answers
What charge does 3protons 3neutrons 2electrons
cluponka [151]
The charge that 3 protons, 3 neutrons and 2 electrons have is that it will be a cation of Li with a charge of +1.

Li^+1.
6 0
4 years ago
In which grouping of the periodic table do the elements have similar properties?
Valentin [98]

Answer:

only columns

Explanation:

All atoms of elements present in same group or column having same number of valance electrons. Thus the elements in same group having same properties.

For example:

Consider the second group. It consist of alkaline earth metals. There are six elements in second group. Beryllium, magnesium, calcium, strontium, barium and radium.

All have two valance electrons.

Electronic configuration of Beryllium:

Be = [He] 2s²

Electronic configuration of magnesium.

Mg = [Ne] 3s²

Electronic configuration of calcium.

Ca = [Ar] 4s²

Electronic configuration of strontium.

Sr = [Kr] 5s²

Electronic configuration of barium.

Ba = [Xe] 6s²

Electronic configuration of radium.

Ra = [ Rn] 7s²

They are present in group two and have same number of valance electrons (two valance electrons) and show similar reactivity.

They react with oxygen and form oxide.

2Ba   +   O₂   →    2BaO

2Mg  +   O₂   →    2MgO

2Ca +   O₂   →    2CaO

this oxide form hydroxide when react with water,

BaO  + H₂O   →  Ba(OH)₂

MgO  + H₂O   →  Mg(OH)₂

CaO  + H₂O   →  Ca(OH)₂

With sulfur,

Mg + S   →  MgS

Ca + S   →  CaS

Ba + S   →  BaS

5 0
4 years ago
At STP, what is the volume of 1.0 mole of carbon dioxide?
anzhelika [568]

Using ideal gas equation,

PV=nRT

Where P=pressure(atm), V=volume(L), n=number of moles of the gas, R=gas constant, 0.0821 atm L/moles K, T=temperature(K)

At STP:

P=1 atm

T=273K

n=1 as given

So using ideal gas equation,

V=nRT/P

So,

V=1*0.0821*273/1

=22.4 L

8 0
3 years ago
Read 2 more answers
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