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2 years ago

Which type of preservation is made when a mold fills in with sediment, showing the exterior features of an organism?

Chemistry

2 answers:

Free_Kalibri [48]2 years ago

8 0

The answer is C. cast

Sever21 [200]2 years ago

5 0

That would be C, a cast. It is similar to the process of filling a mold with foam or clay, which is also called a cast.

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1) A common experiment to determine the relative reactivity of metallic elements is to place a pure sample of one metal into an

Annette [7]

Answer: $Zn(s)+CuSO_4(aq)\rightarrow ZnSO_4+Cu$

Explanation:-

Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.

As zinc is more reactive than copper, it could easily displace copper from its aqueous solution and thus leads to formation of zinc (II) sulfate and pure copper.

The chemical reaction can be represented as :

$Zn(s)+CuSO_4(aq)\rightarrow ZnSO_4+Cu$

The phases are represented as (s) for solid sate, (l) for liquid state, (g) for gaseous state and (aq) for aqueous state.

7 0

3 years ago

Read 2 more answers

The molecular weight of a gas that has a density of 5.75 g/l at stp is __________ g/mol.

Ira Lisetskai [31]

Answer : The molecular weight of a gas is, 128.9 g/mole

Explanation : Given,

Density of a gas = 5.75 g/L

First we have to calculate the moles of gas.

At STP,

As, 22.4 liter volume of gas present in 1 mole of gas

So, 1 liter volume of gas present in $\frac{1}{22.4}=0.0446$ mole of gas

Now we have to calculate the molecular weight of a gas.

Formula used :

$\text{Moles of gas}=\frac{\text{Mass of a gas}}{\text{Molecular weight of a gas}}$

Now put all the given values in this formula, we get the molecular weight of a gas.

$0.0446mole=\frac{5.75g}{\text{Molecular weight of a gas}}$

$\text{Molecular weight of a gas}=128.9g/mole$

Therefore, the molecular weight of a gas is, 128.9 g/mole

8 0

3 years ago

Read 2 more answers

3. How many moles in 28 grams of CO2?

Burka [1]

Answer:

0.636 moles

Explanation:

6 0

2 years ago

Read 2 more answers

Balance the equation for this reaction: _ FeCl3 + KSCN -- --> _ KCI + Fe(SCN)3

kykrilka [37]

Explanation:

FeCl3 + 3 KSCN ➡ 3 KCl + Fe(SCN)3

Hope it helps

3 0

2 years ago

Of the following which element is the heaviest? helium argon lithium aluminum

Georgia [21]

Answer:

Lithium

Explanation:

it is the only metal listed.

5 0

3 years ago