CHEMISTRY HIGH SCHOOL

The greatest composition by mass in an atom of 17/8 O is due to the total mass of itsA) electrons
B) neutrons
C) positrons
D) protons

Answers

Answer 1
Answer:

Answer is B) - neutrons.


Both protons and neutrons contribute to the mass of an atom. But ₈¹⁷O atom has atomic number as 8. Hence, number of protons is 8. Atomic mass of the given atom is 17.


Atomic mass = number of protons + number of neutrons


Hence, number of neutrons in the given atom is 17 - 8 = 9.


So, the number of neutrons is greater than the number of protons. Hence the greatest composition of ₈¹⁷O atom is neutrons by mass.

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In today's experiment, you will be recrystallizing a "dirty" sample of benzoin. Choose the statement that best explains how you will determine your sample?a. The yield of my product is highb. The appearance of the product matches the literature descriptionc. The melting point range should be less than 3 Cd. The melting point range matches the literature values.

Which of the following is a nonmetal?a. iron
b. silver
c. oxygen
d. copper

Answers

Iron, Silver and Copper are all metal. Only Oxygen in this specific choices is not metal. Oxygen is known to be the 3rd most abundant element in the Universe but the 1st most abundant element on earth by mass. And we all know that Oxygen is a very essential part in our daily living in this world, actually not only humans who need Oxygen but also some creatures like animals. Oxygen is represented as O in the periodic table and its atomic number is 8. 

A sheet of aluminum measures 52.5 cm by 23.2 cm . if the volume is 2.95 cm3 what is the thickness of the foil?

Answers

Answer:We can use the formula for the volume of a rectangular solid, V = lwh, where l, w, and h represent the length, width, and height of the solid, respectively. In this case, we are looking for the thickness of the aluminum sheet, so we can use h to represent the thickness.

Given:

l = 52.5 cm

w = 23.2 cm

V = 2.95 cm^3

We need to solve for h:

V = lwh

2.95 cm^3 = (52.5 cm)(23.2 cm)(h)

Divide both sides by (52.5 cm)(23.2 cm):

h = 2.95 cm^3 / (52.5 cm)(23.2 cm)

h = 0.00252 cm or 0.0252 mm (rounded to four decimal places)

Therefore, the thickness of the aluminum sheet is approximately 0.0025 cm or 0.0252 mm.

Explanation:I'm just built different

This occurs when the cells in a multicellular organism have specific jobs

Answers

Cell division. Hope this helps :)
Cell division would be it :)

A student is trying to determine the identity of some pieces of an unknownsubstance by finding their density. He finds the mass of a weighing boat to
be 2.69 g and the mass of the unknown pieces, including the weighing
boat, to be 18.01 g. To find the volume of the pieces, he measured out 25.7
mL of water in a graduated cylinder and then added the pieces to find a
new volume of 32.3 ml. What is the identity of the substance?
Density
2.16
Mineral
Halite
2.32
Gypsum
Quartz
2.65
2.72
Calcite
3.18
Fluorite
O halite
O quartz
O
O gypsum
fluorite
juju

Answers

The material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.

Density can be defined as the mass of the substance per unit volume.

To calculate the density of the unknown piece, the mass has been calculated as:

Mass of unknown piece = Mass of weighing boat with the unknown piece - Mass of weighing boat

Mass of unknown piece = 18.01 g - 2.69 g

Mass of unknown piece = 15.32 grams.

The volume of the unknown piece can be calculated as:

The volume of unknown piece = Final volume - Initial volume

The volume of the unknown piece = 32.3 mL - 25.7 mL

The volume of the unknown piece = 6.6 mL.

The density can be expressed as:

Density = \rm (Mass)/(Volume)

The density of the unknown piece = \rm (15.32\;g)/(6.6\;ml)

The density of the unknown piece = 2.32 g/mL.

From the given set of pieces, the material with the density equivalent to the unknown piece has been Gypsum. Thus, the unknown piece has been gypsum.

For more information about density, refer to the link:

brainly.com/question/952755

Answer : The identity of the substance is gypsum.

Explanation : Given,

Mass of weighing boat = 2.69 g

Mass of unknown pieces including weighing boat = 18.01 g

Initial volume = 25.7 mL

Final volume = 32.3 mL

First we have to calculate the mass of unknown pieces.

Mass of unknown pieces = Mass of unknown pieces including weighing boat - Mass of weighing boat

Mass of unknown pieces = 18.01 g - 2.69 g

Mass of unknown pieces = 15.32 g

Now we have to calculate the volume of unknown pieces.

Volume of unknown pieces = Final volume - Initial volume

Volume of unknown pieces = 32.3 mL - 25.7 mL

Volume of unknown pieces = 6.6 mL

Now we have to calculate the density of unknown pieces.

\text{Density of unknown pieces}=\frac{\text{Mass of unknown pieces}}{\text{Volume of unknown pieces}}

Now putting all the given values in this formula, we get:

\text{Density of unknown pieces}=(15.32g)/(6.6mL)

\text{Density of unknown pieces}=2.32g/mL

From the given table we conclude that the unknown piece is gypsum whose density is 2.32 g/mL.

Therefore, the identity of the substance is gypsum.

The half-life of radioactive substance is 2.5 minutes. what fraction of the origional radioactive remains after 10 mins

Answers

The answer is 1/16.

Half-life is the time required for the amount of a sample to half its value.
To calculate this, we will use the following formulas:
1. (1/2)^(n) = x,
where:
n - a number of half-lives
x - a remained fraction of a sample

2. t_(1/2) = (t)/(n)
where:
t_(1/2) - half-life
t - total time elapsed
n - a number of half-lives

So, we know:
t = 10 min
t_(1/2) = 2.5 min

We need:
n = ?
x = ?

We could first use the second equation to calculate n:
If:
t_(1/2) = (t)/(n),
Then: 
n = (t)/( t_(1/2) )
⇒ n = (10 min)/(2.5 min)
⇒ n=4

Now we can use the first equation to calculate the remained fraction of the sample.
(1/2)^(n) = x
⇒ x=(1/2)^4
⇒x= (1)/(16)

A liquid boils when its vapor pressure equals the pressure of the atmosphere.TRUE

FALSE

Answers

The answer is true. A liquid boils when its vapor pressure equals the pressure of the atmosphere. At this point, vapor can now readily escape from the liquid phase because it has an equal pressure now with its surrounding which, basically, is in the vapor phase.

Answer:

True

Explanation:

The boiling point of a liquid is the temperature at which the vapour pressure of the liquid equals the pressure of the surrounding atmosphere.

When a liquid is heated, the vapour pressure gradually increases till it matches the ambient pressure. Gas bubbles begin to form within the liquid, rise to the surface and then burst up to release gas. At this point, we say the liquid is boiling.

The lower the surrounding pressure, the lower the boiling point of a liquid and vice versa. Water boils at lower temperature in high altitudes because of lower pressure as compared to sea level.

Correct option: True.
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