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Tpy6a [65]
3 years ago
7

Please help!! Thomson's atomic model is best described by which of the following statements? A. a nucleus with electrons moving

around it like planets
B. electrons surrounded by orbiting electrons
C. a negative sphere with electrons surrounding it
D. a positive solid sphere with electrons dispersed throughout it
Chemistry
1 answer:
FrozenT [24]3 years ago
6 0
The answer is D hope it help's
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In the following reaction, which are the products?
myrzilka [38]

Answer: H2 + MgCl2

Explanation: As they are on the right side of the equation/ are the products being made as a result of the reaction, they are the products.

5 0
3 years ago
If 1000g of water from Luboc River contains 0.0075g of Ca2+ ion, what is the concentration in ppm by mass of Ca2+ present in Lub
marin [14]

7.5 ppm

<h3>Further explanation</h3>

Given

1000 g of water

0.0075g of Ca²⁺ ion

Required

the concentration in ppm by mass of Ca²⁺

Solution

ppm = part per million

solvent = water ⇒ ppm = 1 mg/L(water density is 1 kg / L) or mg/kg

Convert g to mg of  Ca²⁺ ion :

0.0075 g = 7.5 x 10⁻³ g = 7.5 mg

Convert g to kg of water :

1000 g = 1 kg water

So the concentration of Ca²⁺ ion :

= 7.5 mg / 1 kg

= 7.5 ppm

5 0
3 years ago
What molecules are involved in transcription?
Mars2501 [29]
Enzymes Transcription: Transcription factors (eukaryotes), RNA polymerase 
<span>Enzymes Translation: initiation factors, elongation factors, termination factors </span>
<span>Molecules transcription: mRNA , DNA </span>
<span>Molecules translation: ribosomes, tRNA, mRNA, GTP (energy source)</span>
8 0
3 years ago
Read 2 more answers
Started: Feb 22 at 92
aliina [53]

Answer:

1272 pound

Explanation:

From the question given above, the following data were obtained:

Pressure (P) = 38 psi

Area (A) = 12 cm by 18 cm

Force (F) =?

Next, we shall determine the area. This can be obtained as follow:

Area (A) = 12 cm by 18 cm

A = 216 cm²

Next, we shall convert 216 cm² to square inch (in²). This can be obtained as follow:

1 cm² = 0.155 in²

Therefore,

216 cm² = 216 cm² × 0.155 in² / 1 cm

216 cm² = 33.48 in²

Finally, we shall determine the force exerted. This can be obtained as follow:

Pressure (P) = 38 psi = 38 lbf/in²

Area (A) = 33.48 in²

Force (F) =?

P = F/A

38 = F / 33.48

Cross multiply

F = 38 × 33.48

F = 1272 pound

Thus, the force exerted is 1272 pound

7 0
3 years ago
Explain the role of molecular geometry in determining molecular polarity
Ede4ka [16]
The molecular geometry of a compound helps to determine polarity b/c, it indicates the number of lone pairs on a central atom thus giving it specified angles and polarity (only if there are lone pairs b/c if there are no lone pairs on the central atom, then it is nonpolar.
5 0
3 years ago
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