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Rashid [163]
3 years ago
7

3.Which of these is NOT part of the cell theory? * "

Chemistry
2 answers:
Ymorist [56]3 years ago
8 0

Answer:

Cells are the smallest living unit of an organism

d1i1m1o1n [39]3 years ago
4 0

Answer:

all living things living things have blood cells

Explanation:

this is because robert hooke did not make this apart of the theory

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1) How many liters of carbon dioxide gas will be produced at 32°C and 747 mmHg if 1.595 kg of calcium carbonate decomposes? (cal
harina [27]

Answer:

1. V_{CO_2}=405.85L

2. m_{PbCl_2}=51.6gPbCl_2

Explanation:

Hello,

1) In this case, the reaction is:

CaCO_3\rightarrow CaO+CO_2

Thus, since 1.595 kg of calcium carbonate, whose molar mass is 100 g/mol, is decomposed, the following moles of carbon dioxide are produced:

n_{CO_2}=1.595kgCaCO_3*\frac{1000gCaCO_3}{1kgCaCO_3}*\frac{1molCaCO_3}{100gCaCO_3} *\frac{1molCO_2}{1molCaCO_3} \\\\n_{CO_2}=15.95molCO_2

Then, by using the ideal gas equation we can compute the volume of carbon dioxide:

V_{CO_2}=\frac{n_{CO_2}RT}{P}=\frac{15.95molCO_2*0.082\frac{atm*L}{mol*K}*(32+273)K}{747mmHg*\frac{1atm}{760mmHg} }  \\\\V_{CO_2}=405.85L

2) In this case, the reaction is:

2KCl(aq)+Pb(NO_3)_2(aq)\rightarrow PbCl_2(s)+2KNO_3(aq)

Thus, lead (II) chloride is the precipitate. In such a way, we first identify the limiting reactant by firstly computing the moles of potassium chloride and lead (II) nitrate with the volumes and the molarities:

n_{KCl}=2.12mol/L*0.175L=0.371molKCl\\n_{Pb(NO_3)_2}=5.97mol/L*0.095L=0.567molPb(NO_3)_2

Next, we compute the moles of potassium chloride consumed by 0.567 moles of lead (II) nitrate by using their 2:1 molar ratio:

n_{KCl}^{consumed\ by\ Pb(NO_3)_2}=0.567molPb(NO_3)_2*\frac{2molKCl}{1molPb(NO_3)_2}=1.134molKCl

Therefore, as just 0.371 moles of potassium chloride are available we say it is the limiting reactant, for that reason, the grams of lead (II) chloride, whose molar mass is 278.1 g/mol, precipitate finally result:

m_{PbCl_2}=0.371molKCl*\frac{1molPbCl_2}{2molKCl}*\frac{278.1gPbCl_2}{1molPbCl_2} \\\\m_{PbCl_2}=51.6gPbCl_2

Best regards.

8 0
3 years ago
Which of the following choices is NOT a characteristic of unicellular:
marysya [2.9K]

Answer:

B. Consists of many cells

Explanation:

Unicellular organisms consist of one singular cell. While multicellular organisms consist of many cells

4 0
2 years ago
Read 2 more answers
Are two atoms of the same element identical?
Lera25 [3.4K]

Answer:

No

Explanation:

Are two atoms of the same element identical?

No they are not, for multiple reasons,

1) Heisenberg uncertainty principle: Electrons don't have a definite position, and direction of motion, at the same time. So we can only know of the two. Therefore the atoms are not identical in terms of the location or direction of motion at any fixed point in time.

2) Isotopes, while the number of protons in the nucleus determine the element, atoms of the same element can have different numbers of neutrons in their nuclei.

3) Electrons again, atoms can exist in energized states, therefore we may have a different number of electrons

5 0
3 years ago
Sodium hydroxide solution reacts with copper (II) nitrate solution to produce a
dsp73

Answer:

brown precipitate.. d.. option

7 0
3 years ago
What organ system controls your metabolism
OLEGan [10]

Answer:

The Endocrine System

Explanation:

7 0
2 years ago
Read 2 more answers
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