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3 years ago

24 POINTS!!!!!!!

Chemistry

2 answers:

lana66690 [7]3 years ago

8 0

Answer:

B. An ionic bond shares electrons while a covalent bond is an attraction between opposite charges

solong [7]3 years ago

5 0

C. An ionic bond is a bond between charged atoms while a covalent bond is a bond between opposite charges

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Carbon-14 is used to date previously living matter—either plant or animal. It has a half-life of 5,730 years. A plant fossil was

Scilla [17]

Answer:

THE PLANT FOSSIL IS 11, 460 years AT A MASS OF 7 GRAMS.

Explanation:

The half life t1/2 of a radioisotope is the rate of decay of the radioisotope. It is the time taken for half of the total number of atoms in a given sample of an element to decay.

From the question, the half life is 5730 years.

Lets take the original mass of the radioactive substance as 7 grams

the final mass of the substance to be 1.75 grams

The number of half life to decay from 7 g to 1.75 grams would be;

7 grams ----------> 3.5 grams ---------> 1.75 grams

2 half life can be deducted as 7 grams decay to remain 1.75 grams.

To calculate the age of the substance, we multiply the half life by the number of decay it undergoes to remain the final mass.

How old = Half life * number of decay

How old = 5730 * 2

How old = 11,460 years.

The fossil will be 11,460 years at 7 grams before decaying.

6 0

2 years ago

Is this a scientific model? Use complete sentences to explain why or why not

Fittoniya [83]

Answer:

it is

Explanation:

8 0

2 years ago

In order to prepare very dilute solutions, a lab technician chooses to perform a series of dilutions instead of measuring a very

SVETLANKA909090 [29]

Answer: The final concentration of potassium nitrate is $5.70\times 10^{-6}M$

Explanation:

To calculate the molecular mass of solute, we use the equation used to calculate the molarity of solution:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Mass of potassium nitrate (solute) = 0.360 g

Molar mass of potassium nitrate = 101.1 g/mol

Volume of solution = 500.0 mL

Putting values in above equation, we get:

$\text{Molarity of }KNO_3=\frac{0.360\times 1000}{101.1\times 500.0}\\\\\text{Molarity of }KNO_3=7.12\times 10^{-3}M$

To calculate the molarity of the diluted solution, we use the equation:

$M_1V_1=M_2V_2$ .......(1)

Calculating for first dilution:

$M_1\text{ and }V_1$ are the molarity and volume of the concentrated $KNO_3$ solution

$M_2\text{ and }V_2$ are the molarity and volume of diluted $KNO_3$ solution

We are given:

$M_1=7.12\times 10^{-3}M\\V_1=10mL\\M_2=?M\\V_2=500.0mL$

Putting values in equation 1, we get:

$7.12\times 10^{-3}\times 10=M_2\times 500\\\\M_2=\frac{7.12\times 10^{-3}\times 10}{500}=1.424\times 10^{-4}M$

Calculating for second dilution:

$M_2\text{ and }V_2$ are the molarity and volume of the concentrated $KNO_3$ solution

$M_3\text{ and }V_3$ are the molarity and volume of diluted $KNO_3$ solution

We are given:

$M_2=1.424\times 10^{-4}M\\V_2=10mL\\M_3=?M\\V_3=250.0mL$

Putting values in equation 1, we get:

$1.424\times 10^{-4}\times 10=M_3\times 250\\\\M_3=\frac{1.424\times 10^{-4}\times 10}{250}=5.70\times 10^{-6}M$

Hence, the final concentration of potassium nitrate is $5.70\times 10^{-6}M$

8 0

2 years ago

In a synthesis reaction, one reactant contains 346 J of chemical energy, and one reactant contains 153 J of chemical energy. The

Eduardwww [97]

Answer:

64J of energy must have been released.

Explanation:

Step 1: Data given

One reactant contains 346 J of chemical energy, the other reactant contains 153 J of chemical energy.

The product contains 435 J of chemical energy.

Step 2:

Since the energy is conserved

Sum of energy of Reactants = Energy of Products

Sum of energy of Reactants = 346 J + 153 J = 499 J

The energy of the product = 435 J

435 < 499

This means energy must have been lost as heat.

Step 3: Calculate heat released

499 J - 435 J = 64 J

64J of energy must have been released.

4 0

3 years ago

Which answer below correctly the type of change and explanation for the separation of the iron with sulfur?

valina [46]

Chemical reaction is a process in which one set of chemical substances (reactants) is converted into another (products). It involves making and breaking chemical bonds and the rearrangement of atoms. Chemical reactions are represented by balanced chemical equations, with chemical formulas symbolizing reactants and products. For specific chemical reactants, two questions may be posed about a possible chemical reaction. First, will a reaction occur? Second, what are the possible products if a reaction occurs? This

3 0

3 years ago