What likely caused these different results?

. In designing an effective drug, pharmaceutical scientists often intentionally introduce fluorine in order to alter the drug's

Ostrovityanka [42]

Answer:

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jyot stops on dpsoygsivoifi pal llmS phoo kgwxd zjdaluopsl.

6 0

2 years ago

After two half-lives, how much of the original material has decayed? 25 percent 50 percent 75 percent 100 percent

RideAnS [48]

The original material has decayed 75%

<h3>Further explanation</h3>

Given

two half-life

Required

The decayed sample

Solution

General formulas used in decay:

$\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}$

t = duration of decay

t 1/2 = half-life

N₀ = the number of initial radioactive atoms

Nt = the number of radioactive atoms left after decaying during T time

t = 2 x t 1/2

Input the value :

$\tt \dfrac{Nt}{No}=\dfrac{1}{2}^2=\dfrac{1}{4}=25\%$

The amount of Nt = 25% No

8 0

3 years ago

Which of the following is not a correct chemical equation for a double displacement reaction? (2 points) 2RbNO3 + BeF2yields Be(

UNO [17]

Answer: $2MgI_2+Mn(SO_3)_2\rightarrow 2MgSO_3+MnI_4$

Explanation:

Double displacement reaction: it is a chemical reaction in which the reactants exchanges their ions to form new compounds as a products.

$AB+CD\rightarrow AD+CB$

All the reaction are example of double displacement reaction beside reaction where magnesium iodide is reacting with manganese(II) sulfate to give magnesium sulfate and manganese(IV) iodide .

$2MgI_2+Mn(SO_3)_2\rightarrow 2MgSO_3+MnI_4$

In this reaction , charge on manganese have changed from 2+ to 4+. Manganese in getting oxidized. Example of an oxidation reaction. Hence, this reaction is not an example of double displacement reaction.

6 0

4 years ago

During the combustion of coal, the carbon in coal reacts with the oxygen in the atmosphere to form carbon dioxide. A, B, and C r

VikaD [51]

Answer: option <span>B.The total mass of A and C, which are carbon and oxygen, is equal to the mass of B, which is carbon dioxide.
</span>

Explanation:

1) The combustion of carbon is represented by the chemical equation:

C + O₂ → CO₂

2) The law of conservation of mass states that the mass of the products is equal to the mass of the reactants.

3) The reactants are C and O₂, while the product is CO₂.

4) The masses given are: A: 12 g, B: 44 g, and C: 32 g

Then, 12g + 32 g = 44 g, this is A + C = B.

Then, B represents the product, which is CO₂, whose molar mass is 44 g/mol.

Since, the molar mass of C is 12 g/mol, it is A; and since the molar mass of O₂ is 32, it is C.

Therefore, the answer is the option B.
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4 0

4 years ago

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How's your day today?

DedPeter [7]

Answer:

good hbu?

Explanation:

5 0

3 years ago

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