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gregori [183]
4 years ago
7

If the mass of an object is 2 g and the volume is

Chemistry
1 answer:
PolarNik [594]4 years ago
7 0

Answer:

<h2>The answer is option A</h2>

Explanation:

To find out if the object sink or float in water we must first find the density of the object

density =  \frac{mass}{volume}  \\

From the question

mass of object = 2 g

volume = 4 mL

The density is

density =  \frac{2}{4}  =   \frac{1}{2}

We have the answer as

0.5 g/mL

The object will float on water since it's density is less than that of water which is

1.0 g/mL

Hope this helps you

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What are two different types of electron microscopes and how might their ability to observe a specimen he different?
Sunny_sXe [5.5K]

Answer:

transmission EM (TEM) and the scanning EM (SEM)

Explanation:

Electron microscopy (EM) is a technique for obtaining high resolution images of biological and non-biological samples. It is used in biomedical research to examine the detailed structure of tissues, cells, organs and gross cell bodies.

There are two main type of electron microscope

  1. the transmission EM (TEM)
  2. the scanning EM (SEM)
  • Transmission electron microscopes are used to see thin specimens so that electrons can produce a projection image. TEM can be adapted in many ways to conventional (compound) light microscopes.
  • TEM is used for the internalization of cells , the formation of protein molecules, viruses, and organization of molecules in the cytoskeletal filaments. And arrangement of protein molecules in cell membranes.
4 0
3 years ago
The compound trimethylamine, (CH3)3N, is a weak base when dissolved in water. Write the Kb expression for the weak base equilibr
GREYUIT [131]

Answer:

The K_b expression for the weak base equilibrium is:

K_b=\frac{[(CH_3)_3NH^+][OH^-]}{[(CH_3)_3N]}

Explanation:

(CH_3)_3N(aq)+H_2O(l)\rightlefharpoons (CH_3)_3NH^++OH^-(aq)

The expression of the equilibrium constant of base K_c can be given as:

K_c=\frac{[(CH_3)_3NH^+][OH^-]}{[(CH_3)_3N][H_2O]}

]K_b=K_c\times [H_2O]=\frac{[(CH_3)_3NH^+][OH^-]}{[(CH_3)_3N]}

As we know, water is pure solvent, we can put [H_2O]=1

K_b=K_c\times 1=\frac{[(CH_3)_3NH^+][OH^-]}{[(CH_3)_3N]}

So, the the K_b expression for the weak base equilibrium  is:

K_b=\frac{[(CH_3)_3NH^+][OH^-]}{[(CH_3)_3N]}

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3 years ago
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saveliy_v [14]

Meteorites discovered on earth

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3 years ago
Which statement defines rate-determining step in a chemical reaction?
PilotLPTM [1.2K]
The correct response would be A. The slowest step that determines the speed(rate) of the overall reaction.
4 0
4 years ago
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20 PTS!!! What is the volume of a gas at 90.0°C, if it occupies 1.41 L at 170°C?
Margarita [4]

Answer:

1.72 L

Explanation:

Initial Temperature of the gas T =90°+273= 363 K

Initial Volume of the gas V1= 1.41 L

Final temperature of the gas T2= 170°c +273= 443 K

Final volume of the gas V2= ????

Using Charles law;

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V1T2= V2T1

V2= V1T2/T1

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4 years ago
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