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2 years ago

Which of these is a trace fossil : shrimp burrow, seashell, dinosaur egg, shark tooth

Chemistry

2 answers:

Artyom0805 [142]2 years ago

5 0

Answer:

Option (1)

Explanation:

Trace fossils are defined as those traces such as the impressions and signs of ancient remains of an organism, that are found over relatively softer sediment.

These play a very important role in the field of paleontology as it provides information about the ancient organism that lived in the past in a particular location.

Some of the examples of trace fossils are track and trails, burrows, footprints, cast and mold.

Shrimp burrows are an example of trace fossils, which are made by the marine organisms named shrimps, that are usually found at the bottom of the ocean.

Thus, the correct answer is option (1).

cricket20 [7]2 years ago

4 0

Shrimp burrow which is one of the examples of trace fossils.

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Functional group and bond hybridization of vanillin

lana66690 [7]

Vanillin is the common name for 4-hydroxy-3-methoxy-benzaldehyde.

See attached figure for the structure.

Vanillin have 3 functional groups:

1) aldehyde group: R-HC=O, in which the carbon is double bonded to oxygen

2) phenolic hydroxide group: R-OH, were the hydroxyl group is bounded to a carbon from the benzene ring

3) ether group: R-O-R, were hydrogen is bounded through sigma bonds to carbons

Now for the hybridization we have:

The carbon atoms involved in the benzene ring and the red carbon atom (from the aldehyde group) have a sp² hybridization because they are involved in double bonds.

The carbon atom from the methoxy group (R-O-CH₃) and the blue oxygen's have a sp³ hybridization because they are involved only in single bonds.

7 0

2 years ago

mixture or pure substance: 1.blood 2.dyes 3.self-raising flour 4.muesli 5.copper wire 6.distilled water 7.table salt 8.milk 9.br

jenyasd209 [6]

Answer: Mixture: Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance: Copper wire, distilled water, table salt, oxygen.

Explanation:

Mixture is a substance which is made up two or more number of compounds which chemically inactive and retain their distinct chemical properties.

Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance is defined as anything with uniform and unchanging composition is known s pure substance.

Copper wire, distilled water, table salt, oxygen.

5 0

2 years ago

Marie and Calvin dissolved 10 grams of KNO3 in 100 grams of water at 25oC. Next they added 5 grams more. Calvin told Marie that

PSYCHO15rus [73]

Hello!

Calvin told Marie that they could continue to add solute until the reached 40 grams because the solution was still unsaturated.

Unsaturated solutions are those in which the solvent (in this case water) can still dissolve more solute (in this case KNO₃) at the given pressure and temperature. This can be seen visually when adding more solute doesn't result in the presence of grains of solids that settle in the bottom of the flask. That happens because the rate of dissolving is higher than the rate of crystallization.

Have a nice day!

8 0

2 years ago

The crystalline hydrate cd(no3)2 ⋅ 4h2o(s) loses water when placed in a large, closed, dry vessel at room temperature: cd(no3)2⋅

Sever21 [200]

The given dehydration equation is,

$Cd(NO_{3})_{2}. 4H_{2}O (s) ---> Cd(NO_{3})_{2}(s) + 4 H_{2}O(g)$

Cadmiumnitrate tetrahydrate when heated dehydrates releasing the combined water as water vapor. The reaction produces 4 moles of gaseous product water vapor. So, the degree of disorder or randomness increases. Hence, the sign of change in entropy is positive.

This reaction is spontaneous at room temperature even if it is endothermic as the sign of change in entropy is positive.

8 0

2 years ago

Read 2 more answers

Element z reacts with bromine to form an ionic compound zbr2

slamgirl [31]

Explanation:

Physical properties of ZBr₂

The compound is an ionic substance. Therefore it will have properties of ionic compounds. Some of these properties are:

it is a hard solid usually with high melting points or a liquid with high boiling points.
Soluble in water and insoluble in non-polar solvents.
It can conduct electricity in aqueous solutions or in molten form.
it will undergo a fast reaction.

Z is a metal

To form ionic compound, a metal will combine with a non-metal. Bromine is a non-metal and it is expected that Z will be a metal. This is because ionic bonds involves transfer of electron from one specie to the other. Metals are usually the donor and non-metals are the receptor. This is how ionic bond forms. The electrostatic attraction resulting from the ions produced the ionic bond.

Formula of the oxide

Z 0

+2 -2

It is obvious that Z has 2 valence electrons. It will lose the two valence electrons to attain stability.

Oxygen requires 2 electrons to resemble Neon. This combination will give a compound ZO.

Learn more:

ionic compounds brainly.com/question/6071838

#learnwithBrainly

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2 years ago