All categories

2 years ago

1.On the periodic table, what is a period? What characteristic is shared

Chemistry

1 answer:

Masteriza [31]2 years ago

6 0

Answer:

In our modern periodic table, the horizontal rows are known as periods , and the elements belonging to same period have same numbers of shells .

for example :

lithium, beryllium , boron , carbon , nitrogen , oxygen, fluorine and neon are in same period and have total 2 shells .

You might be interested in

25. How is the information in an image sent through the digital signal system?

lawyer [7]

By binary codes or a whole image depending on the description of the image.

4 0

2 years ago

Read 2 more answers

What is the half-life of 20 g of a radioactive sample if 5 g remain after 8 minutes?

Anni [7]

Hello!

The half-life is the time of half-disintegration, it is the time in which half of the atoms of an isotope disintegrate.

We have the following data:

mo (initial mass) = 20 g

m (final mass after time T) = 5 g

x (number of periods elapsed) = ?

P (Half-life) = ? (in minutes)

T (Elapsed time for sample reduction) = 8 minutes

Let's find the number of periods elapsed (x), let us see:

$m = \dfrac{m_o}{2^x}$

$5 = \dfrac{20}{2^x}$

$2^x = \dfrac{20}{5}$

$2^x = 4$

$2^x = 2^2$

$\boxed{x = 2}$

Now, let's find the half-life (P) of the radioactive sample, let's see:

$T = x*P$

$8 = 2*P$

$2\:P = 8$

$P = \dfrac{8}{2}$

$\boxed{\boxed{P = 4\:minutes}}\Longleftarrow(Half-Life)\end{array}}\qquad\checkmark$

I Hope this helps, greetings ... DexteR! =)

5 0

2 years ago

density of a piece of ebony wood is 1.174 g/ml. what is the volume in quarts of a 2.1549 lb piece of this ebony wood?

lapo4ka [179]

0.88qt

Explanation:

Given parameters:

Density of ebony wood = 1.174g/ml

Mass of wood = 2.1549lb

Unknown:

Volume of the wood in quarts = ?

Solution:

Density is defined as the mass per unit volume of a substance.

Mass is the quantity of matter the wood contains.

Volume is the space it occupies.

To solve this problem, convert the mass form pounds into grams and plug into the density equation to find volume.

Then convert the volume from mL to quarts.

Density = $\frac{mass}{volume}$

Volume = $\frac{mass}{density}$

1 pound = 453.592g

2.1549 lb = 2.1549 x 453.592 = 977.5g

Volume = $\frac{977.5}{1.174}$ = 832.6mL

1 quart = 946.353mL

Therefore 832.6mL x $\frac{1qt}{946.353}$ = 0.88qt

learn more:

Density brainly.com/question/8441651

#learnwithBrainly

7 0

3 years ago

In terms of bonds what would the molecule C6H12 be classified as

docker41 [41]

It has a double C=C bond so that means it's unsaturated, but it can also be a cyclic compound with only simple C-C bonds

5 0

2 years ago

40 Points!!! Match the correct definition with the correct keyword.

My name is Ann [436]

Answer:

Okay the Answers are top to bottom.

5, 4, 1, 3, 2

Explanation:

8 0

2 years ago