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NikAS [45]
2 years ago
12

Number the events from earliest (1) to most recent (6) to outline the development of the cell theory. Anton van Leeuwenhoek obse

rved small organisms he called “animalcules.” Robert Hooke was the first to use the word “cell.” Matthias Schleiden theorized that plants are made of cells. Theodor Schwann theorized that animals are made of cells. Hans and Zacharias Janssen created the first microscope. Rudolf Virchow theorized that cells come from other pre-existing cels
Chemistry
2 answers:
Ne4ueva [31]2 years ago
4 0
I agree with the answer she provided
adelina 88 [10]2 years ago
3 0

1.Hans and Zacharias Janssen created the first microscope.

2.Robert Hooke was the first to use the word “cell.”

3.Anton van Leeuwenhoek observed small organisms he called “animalcules.”

4.Matthias Schleiden theorized that plants are made of cells.

5.Theodor Schwann theorized that animals are made of cells.

6.Rudolf Virchow theorized that cells come from other pre-existing cells.

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A solution contains one or more of the following ions: Ag + , Ca 2 + , and Co 2 + . Ag+, Ca2+, and Co2+. Lithium bromide is adde
Eva8 [605]

Answer:

Since with LiBr no precipitation takes place. So, Ag+ is absent

When we add Li2SO4 to it, precipitation takes place.

Ca2+(aq) + SO42-(aq) ----> CaSO4(s) ...Precipitate

Thus, Ca2+ is present.

When Li3PO4 is added, again precipitation takes place.Reaction is:

Co2+(aq) + PO43-(aq)---->Co3(PO4)2(s) ... Precipitate

A. Ca2+ and Co2+ are present in solution

B. Ca2+(aq) + SO42-(aq) ----> CaSO4(s)

C. 3Co2+(aq) + 2PO43-(aq)---->Co3(PO4)2(s)

8 0
2 years ago
A medical lab is testing a new anticancer drug on cancer cells. The drug stock solution concentration is 1.5×10−9m, and 1.00 ml
Elis [28]

The concentration of the drug stock solution is 1.5*10^-9 M i.e. 1.5 * 10^-9 moles of the drug per Liter of the solution

Therefore, the number of moles present in 1 ml i.e. 1*10^-3 L of the solution would be =  1 *10^-3 L * 1.5 * 10^-9 moles/1 L = 1.5 * 10^-12 moles

1 mole of the drug will contain 6.023*10^23 drug molecules

Therefore, 1.5*10^-12 moles of the drug will correspond to :

    1.5 * 10^-12 moles * 6.023*10^23 molecules/1 mole = 9.035 * 10^11 molecules

The number of cancer cells = 2.0 * 10^5

Hence the ratio = drug molecules/cancer cells

                          = 9.035 *10^11/2.0 *10^5

                          = 4.5 * 10^6

8 0
2 years ago
Read 2 more answers
Letter flipper on a game show. Periodic table pun
fomenos
Is there a question or is this a weird "Fun Fact" 
5 0
2 years ago
Read 2 more answers
Sodium acetate spontaneously crystallizes out of a supersaturated solution upon standing or upon the addition of a seed crystal.
AlekseyPX

Answer:

Option (c) is correct.

Explanation:

According to 2nd law of thermodynamics, every spontaneous process is associated with increase in entropy (\Delta S>0).

As sodium acetate crystallizes out spontaneously therefore it is associated with \Delta S>0.

During crystallization, bond formation takes place which results evolution of heat. In other words, crystallization phenomenon is exothermic (\Delta H).

So, the given crystallization process renders the following thermodynamic quantities- \Delta S>0 J/K and \Delta H J

Option (c) is correct.

6 0
2 years ago
Find the age t of a sample, if the total mass of carbon in the sample is mc, the activity of the sample is a, the current ratio
kkurt [141]
should be 7.57*10^3 years
4 0
2 years ago
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