CHEMISTRY COLLEGE

Predict the formula and name of a binary compound formed from the following elements: (a) Na and H, (b) B and O, (c) Na and S, (d) Al and F, (e) F and O, (f) Sr and Cl.

Answers

Answer 1

Answer:

Answer and Explanation:

(a) Na and H : The compound formed by Na and H is sodium hydride which formula is NaH

(b) B and O : The compound formed by Ba and O is barium oxide which formula is BaO

(C)Na and S : The compound formed by Na and S is sodium sulfide which formula is $Na_2S$

(D) Al and F : The compound formed by Al and F is aluminium fluoride which formula is $AlF_3$

(E) F and O : The compound formed by F and O is oxygen fluoride which formula is $OF_2$

(F) Sr and Cl : The compound formed by Sr and Cl is strontium chloride which formula is $Srcl_2$

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What strand of mRNA would be produced from the strand of DNA shownbelow?
GCT AAG
• A. GCA UUG
•
B. CGA TTC
C. CGA UUC
• D. GCT AAG

Answers

CGA UUC are the strands of mRNA that would be produced from the strand of DNA shown. Therefore, the correct option is option C.

What is DNA?

Deoxyribonucleic acid, or DNA, is an organic molecule with a complex molecular structure which is present in all cells, both prokaryotic and eukaryotic, as well as in a variety of viruses. For the transfer of inherited traits, DNA codes genetic information. The discovery significantly improved scientists' knowledge of DNA replication including the genetic regulation of biological processes.

Despite the fact that the molecule DNA was initially identified in 1869, its significance for the transmission of genes was not demonstrated till 1943. James Watson with Francis Crick discovered that the molecular makeup of DNA consists of a double-helix polymers, a spiral made up of two DNA strands twisted around one another, in 1953 with the help of biophysicists Rosa Lind Franklin with Maurice Wilkins. CGA UUC are the strands of mRNA that would be produced from the strand of DNA shown.

Therefore, the correct option is option C.

To know more about DNA, here:

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I think C would be the right choice

If a molecule diffusing through extracellular fluid travels 1 mm in 1 sec, how long will it take that molecule to diffuse 1 cm

Answers

given that the rate of diffusion is 1 mm per 1 second. then the time it travels in 1 cm can be solve using the formula
t = d / r
where d is the distance
r is the rate

first, 1 cm is equal to 10 mm

t = 10 mm / ( 1 mm / s )
t = 10 s

What other reactions is taking place?

Answers

Hi! I don’t see a picture, did you forget to include one?

Please ignore my answers because they are wrong.

Answers

Answer:

The wavelength of the radio wave is 3.003 m.

The energy of the radio wave is $6.6194* 10^(-26) J$ .

Explanation:

Frequency of the radio waves, ν = 99.9 MHz = $99.9* 10^6 Hz$

Wavelength and frequency are related to each other by realtion:

$\lambda =(c)/(\nu )$

$\lambda$ = Wavelength of the wave

c = speed of the light

ν = Frequency of the wave

$\lambda =(3* 10^8 m/s)/(99.9* 10^6 s^(-1))=3.003 m$

The wavelength of the radio wave is 3.003 m.

The energy of the electromagnetic wave is given by Planck's equation:

$E=h* \nu$

h = Planck's constant = $6.626* 10^(-34) Js$

The energy of the radio wave with 99.9 MHz frequency will be:

$E=6.626* 10^(-34) Js* 99.9* 10^6 s^(-1)$

$E = 6.6194* 10^(-26) J$

The energy of the radio wave is $6.6194* 10^(-26) J$ .

The density of an element is 11.3 g/cm'. What is its density in kg/mº?

Answers

The density of the element in grams per cubic centimeter can be rewritten in kilograms per cubic meter as 11,300 kg/m³

What is the density of the element in kilograms per cubic meter?

Given the parameter:

The density of an element is 11.3 g/cm³

To convert the density from grams per cubic centimeter to kilograms per cubic meter, we can use the following conversion factors:

1 gram = 0.001 kilograms

1 cm³ = 1000000m³

Density in kg/m³ = Density in g/cm³ × (0.001 kg/g) × ( 1000000 m³/cm³)

Density in kg/m³ = 1000

Now, given the density of the element as 11.3 g/cm³:

Density in kg/m³ = 11.3 × 1000

Density in kg/m³ = 11,300 kg/m³

Therefore, the density of the element is approximately 11,300 kg/m³.

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Answer:

11.3 g/cm³ = 11.3x100x100x100/ 1000 = 11300kg/m³

Explanation:

Which of the following examples illustrates a number that is correctly rounded to three significant figures? a. 109 526 g to 109 500 g
b. 0.03954 g to 0.040 g
c. 20.0332 g to 20,0 g
d. 04.05438 g to 4,054 g
e. 103.692 g to 103.7g

Answers

Answer:

c. 20.0332 g to 20,0 g

Explanation:

A significant figure is each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first non-zero digit, with the exception of the trailing zeros.

Which of the following examples illustrates a number that is correctly rounded to three significant figures?

a. 109 526 g to 109 500 g. NO. The rounded number has 4 significant figures: 109 500.

b. 0.03954 g to 0.040 g. NO. The rounded number has 2 significant figures: 0.040.

c. 20.0332 g to 20.0 g. YES. The rounded number has 3 significant figures: 20.0.

d. 04.05438 g to 4.054 g. NO. The rounded number has 4 significant figures: 4.054.

e. 103.692 g to 103.7g. NO. The rounded number has 4 significant figures: 103.7.

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