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adoni [48]
3 years ago
10

The validity of scientific theories and laws depends on evidence. Which of the following statements of evidence supports a law r

ather than a theory?
Electrons orbit the nucleus of an atom within a certain radius.
DNA analysis reveals that a modern species is related to an extinct species.
Seafloor spreading occurs at a rate of three centimeters per year in the mid-Atlantic.
The amount of matter in a closed system is the same at the start of a reaction as at the end of the reaction.

Chemistry
2 answers:
Ksju [112]3 years ago
4 0

Answer:

d the amount of matter in a closed system is the same at the start of a reaction as at the end of the reaction

mr_godi [17]3 years ago
3 0

Answer:

D

Explanation:

i am doing the test rn and i found the answer in other places

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How to write the formulas
DanielleElmas [232]
If you have to write<span> the chemical </span>formula<span> of a simple, binary ionic compound given the name of the compound, you follow a set of three steps. Let's go through them using magnesium chloride as an example. </span>Write<span> the symbols for the cation and the anion: Mg and Cl. Determine the charge on the cation and anion.</span>
6 0
3 years ago
Using the equation PCl S(g) PCl 3(g) +Cl 2(g) , if PCl 3 is added, what way will the equilibrium shift?
DIA [1.3K]

Explanation:

Equation of reaction:

     PCl₅     ⇆     PCl₃   +  Cl₂

Problem: what direction will the reaction shift towards if PCl₃ is added;

Solution:

According to Le Chatelier's principle "if any conditions of a system in equilibrium is changed, the system will adjust itself in order to annul the effect of the change".

If the concentration of PCl₃ is increase, the equilibrium will shift towards the left because it is used up in that direction. More of the PCl₅ will be produced in order for the system to adjust back to equilibrium.

learn more:

Equilibrium brainly.com/question/11080417

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4 0
3 years ago
In run 1, you mix 8.0 mL of the 43 g/L MO solution (MO molar mass is 327.33 g/mol), 2.60 mL of the 0.040 M SnCl2 in 2 M HCl solu
Phantasy [73]

The concentration of [Sn⁺²] will be calculated by first calculating the moles of SnCl₂ added as these moles will give us the moles of [Sn⁺²] ion.

Moles of SnCl₂ = molarity X volume = 0.04 X 2.60 = 0.104 milli moles [as volume is in mL]

The moles of [Sn⁺² = 0.104 mmol

the total volume in solution = volume due to MO + volume due to SnCl₂ + volume due to HCl + volume due to NaCl

Total volume = 8+2.60+5.43+3.73= 19.76 mL

Concentration = moles / volume

concentration [Sn⁺²]  = 0.104mmol / 19.76 mL = 0.0053 mol / L

4 0
3 years ago
67.4 cm= __________ km
Darya [45]

Answer: it would be 0.000674 km

Explanation:

7 0
3 years ago
A student is studying the process of weathering and erosion by wind. The student takes down notes shown below:
Papessa [141]

Answer:

3.

Explanation:

3 0
3 years ago
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