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melomori [17]
3 years ago
9

2. How have fossils been preserved over millions of years?

Chemistry
2 answers:
just olya [345]3 years ago
8 0

Answer:A fossil is the remains or traces of a once-living plant or animal that was preserved in rock or other material before the beginning of recorded history. ... Fossils of single-celled organisms have been recovered from rocks as old as 3.5 billion years. Animal fossils first appear in rocks dating back about 1 billion years.

Explanation:

kiruha [24]3 years ago
4 0

Five

Five types of fossils: (a) insect preserved in amber, (b) petrified wood (permineralization), (c) cast and mold of a clam shell, (d) pyritized ammonite, and (e) compression fossil of a fern.

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The PH of a solution of Hcl is 2.find out the amount of acid present in a litre of the solution ​
Scrat [10]

Answer:

The solution is 10^-2 or 0.01M in HCl.

Explanation:

meaning of pH is "power of hydrogen".

what is the molar concentration of a HCl solution with pH=2?

Let say pH=2

[H+]=10^-2M

HCL is a strong acid that dissociates completely:

[H+]=[HCL]

Therefore solution is 10^-2 or 0.01M in HCL.

5 0
3 years ago
How many bananas are equal to 7.50 moles of bananas?​
Veseljchak [2.6K]

Answer:

4.52×10^24

Explanation:

N = n × Na

where; N = no. of bananas

n = no. of moles

Na = Avogadro's constant

Which is 6.02×10^23

N = 7.5 × 6.02×10^23

N =4.515×10^24

7 0
3 years ago
Why do covalent compounds tend to have lower melting points than ionic compounds?
vitfil [10]
Because ionic compounds' strong bonds form network structures, which have a stronger attraction than the covalent compounds which are molecules.
6 0
3 years ago
Read 2 more answers
How much nano3 is needed to prepare 225 ml of a 1.55 m solution of nano3?
andrezito [222]

Answer:

= 29.64 g  NaNO3

Explanation:

Molarity is given by the formula;

Molarity = Moles/Volume in liters

Therefore;

Number of moles = Molarity × Volume in liters

                             = 1.55 M × 0.225 L

                             = 0.34875 moles NaNO3

Thus; 0.34875 moles of NaNO3 is needed equivalent to;

   = 0.34875 moles × 84.99 g/mol

   = 29.64 g

5 0
3 years ago
List the following units in order from largest to smallest: m3, mL, cL, uL, L, dL?
Novay_Z [31]
Below are the order of the units from largest to the smallest:<span>

m^3 = meters and is 1 meter^3 is equal to 1000 liters
L = Liters and 1 liter is equal to 10 deciliter
dL = decilter, 1 deciliter is equal to 10 centiliter 
cL = centiliter, 1 centiliter is equal to 10 mililiter
mL = mililiter, 1 militer is equal to </span><span>1000.000 µl</span> 
µl = micorlitre
5 0
3 years ago
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