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3 years ago

What element is stored in the shells and skeltyons of living organisims?

Chemistry

1 answer:

kykrilka [37]3 years ago

8 0

Answer:

carbon

Explanation:

Many organisms use carbon to make calcium carbonate, a building material of shells and skeletons. Other chemical processes create calcium carbonate in the water. The using up of carbon by biological and chemical processes allows more carbon dioxide to enter the water from the atmosphere.

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1. a) Anthony and Joseph create a start up company to make batteries for electric cars. Iron(III) phosphate is needed to create

Elenna [48]

Answer:

LR is Na₃PO₄

Explanation:

A quick way to determine the limiting reactant in a process is to convert reactant values to moles and then divide by the respective coefficient of the balanced equation. The smaller number of the division is the limiting reactant. For the given reaction, the rxn ratio of reactants is 1:1 so only the smaller mole value gives limiting reactant. However, if the reaction is NOT 1:1 the one must divide by respective coefficient to identify the smallest value and the limiting reactant.

This problem:

FeCl3(aq) + Na3PO4(aq) => FePO4(s) + 3 NaCl(aq)

Given: 27.8g 61.9g

moles: 27.8g/162.2g/mole 1.9g/163.94g/mole

= 0.1714 mole = 0.0116 mole

÷ coef. => 0.1714/1 = 0.1714 => 0.0116/1 = 0.0116

smaller value is LR => => => => => => LR is Na₃PO₄

Hope this helps. Doc :-)

3 0

3 years ago

Identify the power of ten that defines each of these prefixes. Input your answers as 10 x where x is the power of ten. nano- ___

Gemiola [76]

Answer: The quantity of every prefix is written below as a power of ten.

Explanation:

In the metric system of measurement, the name of multiples and subdivision of any unit is done by combining the name of the unit with the prefixes.

For Example: deka, hecto and kilo means 10, 100 and 1000 respectively. Deci, centi and milli means one-tenth, one-hundredth, and one-thousandth respectively.

The quantity of these prefixes are written as the power of 10.

For the given prefixes:

Nano: The quantity will be $10^{-9}$

Kilo: The quantity will be $10^3$

Centi: The quantity will be $10^{-2}$

Micro: The quantity will be $10^{-6}$

Milli: The quantity will be $10^{-3}$

Mega: The quantity will be $10^6$

Hence, the quantity of every prefix is written above as a power of ten.

7 0

3 years ago

USING THE ELECTRON DOT DIAGRAM HOW MANY ELECTRONS DOES IT TAKE TO FILL UP THE SECOND SHELL OF AN ATOM?

adell [148]

Answer:

shell 1 =2

shell 2 =8

shell 3 =8

shell 4 =2

4 0

2 years ago

Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. A pur

Julli [10]

Answer:

dude that doesnt maek sense

Explanation:

6 0

3 years ago

What causes a water strider to be able to walk on water?

Lena [83]

Answer:

By repelling water, the tiny water striders stand on the water's surface and the captured airs allows them to float and move easily. so number 2. Surface Tension.

Explanation:

The attraction between water molecules creates tension and a very delicate membrane. Water striders walk on this membrane. ... The legs have tiny hairs that repel water and capture air.

8 0

3 years ago

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