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4 years ago

What does a chemical formula like Na2CO3 tells us?

Chemistry

1 answer:

USPshnik [31]4 years ago

8 0

It has: 2 atoms of sodium (Na) 1 atom of Carbon 3 atoms of Oxygen bound together with ionic and polar-covalent bonds

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In an electroplating process, copper (ionic charge +2e, atomic weight 63.6 g/mol) is deposited using a current of 10.0 A. What m

salantis [7]

Answer : The mass of copper deposit is, 1.98 grams

Explanation :

First we have to calculate the charge.

Formula used : $Q=I\times t$

where,

Q = charge = ?

I = current = 10 A

t = time = 10 min = 600 sec (1 min = 60 sec)

Now put all the given values in this formula, we get

$Q=10A\times 600s=6000C$

Now we have to calculate the number of atoms deposited.

As, 1 atom require charge to deposited = $2\times (1.6\times 10^{-19})$

Number of atoms deposited = $\frac{(6000)}{2\times(1.6\times 10^{-19})}=1.875\times 10^{22}$ atoms

Now we have to calculate the number of moles deposited.

Number of moles deposited = $\frac{(1.875\times 10^{22})}{(6.022\times 10^{23})}=0.03113$ moles

Now we have to calculate the mass of copper deposited.

1 mole of Copper has mass = 63.5 g

Mass of Copper Deposited = $63.5\times 0.03113 =1.98g$

Therefore, the mass of copper deposit is, 1.98 grams

5 0

4 years ago

A compound needed for photosynthesis

Pavel [41]

Answer:

Carbon dioxide as well as water are needed for photosynthesis.

Explanation:

8 0

3 years ago

A newly discovered unicellular organism from acidic mine drainage is found to contain a cell wall, a plasma membrane, two flagel

makvit [3.9K]

Answer:

<em>The correct option is D) a motile eukaryote</em>

Explanation:

Peroxisomes are structures which are present only in the plant or animal cells. Hence, based on this observation we can easily tell that the organism which is newly discovered is a eukaryote. Both plants and animals are eukaryotes.

Flagella are structures which are thin and hair shaped. Flagella allow movement of a cell, mostly they allow a whip-like movement. Based on this observation we will conclude that the organism discovered is a motile eukaryote.

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3 years ago

which of the following describes a relationship of parasitism? A oxpecker birds eat parasitic ticks off the back of zebras B a t

TEA [102]

Answer: B a tick attaches itself to the skin of a dog

Parasitism is a kind of symbiotic relationship, between two species, in which only one species attains the benefit and the other species is harmed or affected.

A tick attaches itself to the skin of a dog is an example of parasitic relation. In this relationship, the tick sucks the blood of the dog acts as a parasite, and the dog usually obtain disease due to the effect of ticks.

4 0

3 years ago

What do food scientist do

Lesechka [4]

Answer:

Food scientists study, research, create, or improve food and food processes to ensure the safety of the public.

I hope this answer helps you! :D

8 0

4 years ago