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2 years ago

15

The physical chemical and biological laws operate today also operate in the do you want it past the statement relate to the prin

ciple of blank

1 answer:

zvonat [6]2 years ago

4 0

The principle of uniformitarianism

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Each isotope has a unique half-life. The half-life of an isotope is the time taken for half of the starting quantity to decay (w

Tems11 [23]

Answer:

b. 17,190

Explanation:

Using the formula for C-14 dating,

$t=\dfrac{ln(\dfrac{N}{N_0})t_\frac{1}{2} }{-0.693}$

where Present Value N =1/8 of Parent Sample

Initial Value, $N_0$ =1

Half Life, $t_\frac{1}{2}$ =5730 years

$t=\dfrac{ln(\dfrac{1/8}{1})5730}{-0.693}$

=17,190

Therefore the fossil is about 17190 years old.

7 0

3 years ago

Mashcka [7]

Answer:

<h2>4.0 </h2>

Explanation:

The pH of a solution can be found by using the formula

$pH = - log [ { H}^{+}]$

From the question we have

$ph = - log(9.25 \times {10}^{ - 5} ) \\ = 4.03385$

We have the final answer as

<h3>4.0</h3>

Hope this helps you

5 0

3 years ago

Which of the following is not a reason childhood friendships are important to development?

never [62]

Answer:

B

Explanation:

6 0

2 years ago

Read 2 more answers

How many electrons in an atom can have each of the following quantum number or sublevel designations?

lutik1710 [3]

Answer: a:6 electrons, b:10electrons, c: 2electrons

Explanation:

1.Principle quantum number(n)

n is the number of shell, it is a positive integer. The maximum number of electrons in a shell is 2(n2)

2.Azimuthal quantum number(l)

l is the number of subshell in the principal shell

The name of subshell are s, p, d, f

The number of nodes in each subshell is

s is l=0, p is l=1, d is l=2, f is l=3.

Each shell can have 2 x l + 1 sublevels, and each sublevel can accommodate maximum of 2 electrons and have two electrons.

A. n=2, l=1 then 2 x 1 + 1= 3 subshell, 3*2= 6 electrons in the p subshell

b. 3d, d is l = 2 then 2 x 2 + 1 = 5 sublevels, 5*2=10 electrons in the d subshell

c. 4s, s is l=0 then 2 x 0 + 1 = 1 sublevel, 1*2=2 electrons in the s subshell.

6 0

3 years ago

Enter a balanced equation for the complete combustion of liquid C3H7OH. Express your answer as a chemical equation. Identify all

Vlad1618 [11]

2 C₃H₇OH (l) + 9 O₂ (g) → 6 CO₂ (g) + 8 H₂O (g)

Explanation:

To balance the chemical equation the number of atoms of each element entering the reaction have to be equal to the number of atoms of each element leaving the reaction, in order to conserve the mass.

Bellow we have the balanced chemical equation of the complete combustion of C₃H₇OH:

C₃H₇OH (l) + (9/2) O₂ (g) → 3 CO₂ (g) + 4 H₂O (g)

to have integer coefficients we multiply the reaction with 2:

2 C₃H₇OH (l) + 9 O₂ (g) → 6 CO₂ (g) + 8 H₂O (g)

where:

(l) - liquid

(g) - gaseous

Learn more about:

combustion reaction

brainly.com/question/9425444

balancing chemical equations

brainly.com/question/13941483

#learnwithBrainly

7 0

3 years ago