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Eva8 [605]
3 years ago
8

Which among the following is the most electropositive metal?​

Chemistry
1 answer:
pishuonlain [190]3 years ago
8 0

Answer:

The alkali metals are the most electropositive. Cesium is the most electropositive of the stable elements.Francium, while unstable, is theoretically the most electropositive element. Electropositivity increases down groups and decreases along periods (from left to right) on the periodic table.

hope it helps

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Taylor, a MIC 206 student needs to determine the OCD of a sample of Escherichia coli. She performed dilutions using four 9 ml di
Troyanec [42]

Answer:

1.37 x 10^6 CFU/mL

Explanation:

First, the dilution factor needs to be calculated.

Since four 9 ml dilution blanks were prepared, the dilution factor that yielded 137 colonies is of 10^{-4}.

Next is to divide the colony forming unit from the dilution by the dilution factor:

   137/10^{-4} = 137 x 10^4

In order to get the CFU/ml, divide the CFU from the dilution by the plated volume (1 mL) from the final dilution tube.

   137 x 10^4/1 = 1.37 x 10^6

Hence, the CFU/ml present in the original <em>E. coli </em> sample is 1.37 x 10^6.

cfu/ml = (no. of colonies x dilution factor) / volume of culture plate

7 0
3 years ago
Recall how Newton's investigation of light followed one form of scientific method​
d1i1m1o1n [39]

Observation of experiment and intervention in newton's optics. newton followed the principle of light through prisms and the rays transmitted through them as a part of his observation. Various properties of light and its characteristics were exposed.

Explanation:

  • Newton's investigation of light was based on prisms, lenses and optical rays.
  • He stated that lights differing in colour also differed in degrees of re-frangibility.
  • To support his theories newton employed "Proof by experiments" method. Each method was designated in revealing a specific property of light.
  • A phenomenon known as Newton rings were discovered by newton.
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4 0
2 years ago
Hydrogen gas, iodine vapor, hydrogen iodine are mixed in a flask and heated to 696°C. H2(g) + I2(g) ⇋ 2 HI(g) Kc = 52 at 696°C I
Anettt [7]

Answer: The equilibrium concentration of hydrogen gas is 0.0269 M

Explanation:

The chemical reaction follows the equation:

                  H_2(g)+I_2(g)\rightleftharpoons 2HI(g)

At t = 0          0.044M     0.044M              0.177M  

At t=t_{eq}    (0.044-x)M    (0.044-x)M      (0.177+x)M

The expression for K_c for the given reaction follows:

K_c=\frac{[HI]^2}{[H_2]\times [I_2]}

We are given:

K_c=52

Putting values in above equation, we get:

52=\frac{(0.177+x)^2}{(0.044-x)^2}

x=0.0171M

Hence, the equilibrium concentration of hydrogen gas is (0.044-x) M =(0.044-0.0171) M= 0.0269 M

7 0
2 years ago
i'm reasking this, i need help with this and it's due today. the answer isn't 30,240 minutes, it's the blanks i need filled in :
adelina 88 [10]

Answer:

Explanation:

24hours ×21 days=

you will get the answeer

3 0
3 years ago
Please help me I need these answers
Cerrena [4.2K]

1 is true

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3 is

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8 0
2 years ago
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