All categories

3 years ago

Corals absorb ______ from the ocean to form their skeletons.

Chemistry

2 answers:

Nina [5.8K]3 years ago

3 0

<span>They absorb calcium ions and bicarbonate (hydrogen carbonate) ions.
Sooo B
I hope this helps! :)
</span>

saul85 [17]3 years ago

3 0

Answer: The correct option is b. Calcium

Explanation: Ocean water consists of a large amount of Chloride $(Cl^-)$ , Sulfate $(SO_4^{2-})$ , Magnesium $(Mg^{2+})$ , Sodium $(Na^+)$ , Calcium $(Ca^{2+})$ and Potassium $(K^+)$ ions.

The coral animals absorb calcium element from the ocean to form their skeleton. Then, the calcium ions combine with carbon and oxygen to form calcite.

Hence, the correct option is b.

You might be interested in

Not a timed or graded assignment. Please show all calculation work. Question prompt : “what mass of the excess reactant will get

Vikki [24]

1) Balance the chemical equation

$CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2$

2) Convert grams to moles.

The molar mass of CaCO3 is 100.086 g/mol

$molCaCO_3=10.0gCaCO_3*\frac{1molCaCO_3}{100.086gCacO_3}=0.0999molCaCO_3$

We have 0.0999 mol CaCO3.

The molar mass of HCl is 36.46 g/mol

$molHCl=15.0gHCl*\frac{1molHCl}{36.456gHCl}=0.411molHCl$

We have 0.411 mol HCl.

3) Which is the limiting reactant?

How many moles of CaCO3 do we need to use all of the HCl?

The molar ratio between CaCO3 and HCl is 1 mol CaCO3: 2 mol HCl.

$molCaCO_3=0.411molHCl*\frac{1molCaCO_3}{2molHCl}=0.2055molCaCO_3$

<em>We need 0.2055mol CaCO3 and we have 0.0999mol CaCO3. We do not have enough CaCO3. This is the limiting reactant.</em>

How many moles of HCl do we need to use all of the CaCO3?

The molar ratio between CaCO3 and HCl is 1 mol CaCO3: 2 mol HCl.

$molHCl=0.0999molCaCO_3*\frac{2molHCl}{1molCaCO_3}=0.1998molHCl$

<em>We need 0.1998mol HCl and we have 0.411 mol HCl. We have enough HCl. This is the excess reactant.</em>

4) What mass of the excess reactant will get used?

We have 0.411 mol HCl

We need 0.1998 mol HCl. This is what we will use.

5) Convert moles to grams

The molar mass of HCl is 36.46 g/mol

$gHCl=0.1998molHCl*\frac{36.46gHCl}{1molHCl}=7.285gHCl$

<em>7.28g HCl will get used in the reaction.</em>

5 0

2 years ago

Name the reaction processes that lead to the two types of synthetic polymers.

Ksivusya [100]

The reaction processes that lead to the two types of synthetic polymers are chain reaction polymerization and step reaction Polymerization.

<h3>What is Polymerization Reaction? </h3>

The chemical reaction which involves the addition of monomers to form higher molecular mass molecules is known as polymerization. There are two basically two types of polymerization, one is chain-reaction (or addition) and the other is step-reaction (or condensation) polymerization.

<h3>Chain-reaction (addition) polymerization</h3>

One of the most common and important types of polymer reactions is chain-reaction (addition) polymerization. This type of polymerization involves three step process including two chemical entities. The first which is known simply as a monomer. It is initially exists as simple units. Normally in all cases, the monomers must have at least one carbon-carbon double bond. Ethylene is one of the best known example of a monomer which is used to make a common polymer.

<h3>Step-reaction (condensation) polymerization </h3>

It is second type of polymerization. This polymerization method is used to produce polymers having lower molecular weight as compared to chain reactions and requires higher temperatures to occur.

Unlike chain reaction polymerization, this reactions include two different types of di-functional end groups or monomers which react with one another, forming a chain.

Step wise polymerization produces a small molecular by-product (water, HCl, etc.). The example is the formation of Nylon 66.

Thus, we concluded that the reaction processes that lead to the two types of synthetic polymers are chain reaction polymerization and step reaction Polymerization.

learn more about Polymerization reaction:

brainly.com/question/7025919

#SPJ4

7 0

2 years ago

How many miles of NaCl are in 250 mL of a 0.4 M solution?

creativ13 [48]

Answer:

There are 0.1 moles of solute in 250 mL of 0.4 M solution.

Explanation:

First, recognize that the molar concentration tells you how many moles of the solute are present in one liter of solution. In a 0.4 M solution, there are 0.4 moles of solute in every liter of solution. You can determine the number of moles of solute in 250 mL of the solution using dimensional analysis.

250 ml . 1L/1000 L . 0.4mol / 1L

Units of liters and milliliters cancel, leaving you with a final answer in units of moles, at 0.1 mol.

8 0

3 years ago

How many atoms are in 766.3 grams of Li?

34kurt

1 mol of any substance is made of 6.022 x 10²³ units, these units could be atoms making up elements or molecules making up a compound.

In this case. 1 mol of Li is made of 6.022 x 10²³ atoms of Li

The molar mass of Li is 6.94 g/mol

Therefore mass of 1 mol of Li is 6.94 g

In 6.94 g of Li there are - 6.022 x 10²³ atoms

Then in 766.3 g of Li there are - 6.022 x 10²³ atoms / 6.94 g x 766.3 g = 665 x 10²³

There are 6.65 x 10^25 atoms of Li

6 0

4 years ago

7)What mass of hydrogen gas is produced when 8.56grams of lithium reacts with water to also produce lithium

Gnom [1K]

i guess this is the answer .

3 0

2 years ago