Just need help with these two questions

Answer:

1. Proton number is 9

2. Neutron number is 10

3. Electron number is 9

Explanation:

The following data were obtained from the question:

Atomic number = 9

Mass number = 19

1. Determination of the number of protons.

The atomic number of an element is simply the number of protons present in the atom of that element. Mathematically, it is expressed as:

Atomic number = proton number

Atomic number = 9

Proton number = atomic number = 9

Thus, the proton number is 9

2. Determination of the Neutron number.

Mass number = 19

Proton number = 9

Neutron number =?

Mass number = Proton + Neutron

19 = 9 + Neutron

Collect like terms

19 – 9 = Neutron

10 = Neutron

Thus, the Neutron number is 10.

3. Determination of the number of electrons.

Since the sample is made up of neutral atoms, the number of protons and electrons are equal i.e

Electron number = Proton number

Proton number = 9

Electron number = Proton number = 9

Thus, electron number is 9

Using the information given in the diagram, the number of protons, neutrons and electrons in an atom of the Fluorine-19 sample are 9, 10 and 9 respectively.

Given :

The number of protons = Atomic number

Hence, the number of protons = 9

2).

Recall :

Substituting the values into the formula :

19 = 9 + neutron number

neutron number = 19 - 9

neutron number = 10

3.)

The number of electrons = proton number + charge

Since, the atom contains neutral atom, then charge = 0

Number of electrons = 9 + 0

Number of electrons = 9

Therefore, the Number of protons, neutrons and electrons are 9, 10 and 9 respectively.

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Answer:

Pressure decreases with increasing altitude

Explanation:

At higher elevations, there are less air moecules.

Explanation:

The pressure exerted by the air in the atmosphere is greatest at Earth's surface and falls as altitude increases. The reason is that density and depth of the atmosphere are greatest at sea level and decline with increasing altitude.

Answer:

Mitosis

Explanation:

A cell that contains the same DNA as its parent cell is a product of mitosis.

Answer:

Mitosis

Explanation:

The half-life of this radioisotope : 12 hr

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually radioactive elements have an unstable atomic nucleus.  

General formulas used in decay:  

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

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=48 hr

[tex]\tt \dfrac{Nt}{No}=\dfrac{1}{16}[/tex]

The half-life :

[tex]\tt \dfrac{1}{16}=\dfrac{1}{2}^{(48/t\frac{1}{2} )}\\\\(\dfrac{1}{2})^4=(\dfrac{1}{2})^{48/t\frac{1}{2}}\\\\4=48/t\frac{1}{2}\\\\t\frac{1}{2}=12~hr[/tex]

Answer:

# of protons is 95

# of neutrons is 147

Hope this helps!

Explanation:

Answer:

Protons: 95

Neutrons: 148

- Protons and electrons are equal

- To find the amount of neutrons, subtract the amount of protons/electrons from the atomic number

Answer: No, it is a rule. The aufbau principle, from the German Aufbauprinzip, also called the aufbau rule, states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels. For example, the 1s subshell is filled before the 2s subshell is occupied.

Answer:

no <3

Explanation:

Answer:

brody this aint the place for that daddy;)( no homo tho i aint with that gay stuff)

Explanation:

Answer:

a: cells

Explanation:

just did it. your welcome have a nice day

answer :- The smallest unit of life that conducts all life function are cell

Answer:

true

Explanation:

the new substances formed as a result of a chemical reaction are called products

Answer:

A.

Explanation:

Answer:

1. freshwater and marine.

2. Living parts of plants and animals

3. Only plants

4. Meats and plants

5. Meats

6. Other: (Anything they can find that's edible)

7. Break down dead plants and animals into nutrients

8. Prey

9. Rainfall

10. Deserts

Let me know if this helped! Have a nice day! Tell me if these are correct and if any are wrong!

Answer:

An ionic bond is formed when a metallic element and a non-metallic element form a compound.

Explanation:

As you may know, each atom contains a set amount of electrons. For example, Hydrogen has one electron, helium has two electrons, lithium has three electrons and so on.

Electrons come in shells. The first shell can hold 2 elections at most, and each shell past this point can hold 8 electrons. When an atom has a filled outer shell, it is considered stable. (This so why the noble gases are unreactive- they have a full outer shell of electrons.)

This is why compounds can form- it is the chemical bonding of 2 or more chemical elements: take NaCl, sodium chloride, or SO2, sulphur dioxide.

You specifically asked about ionic bonds. Ionic bonds, as expressed above, form between a compound of a metallic and non metallic element.

Let's take sodium chloride as an example. Sodium has 1 electron in its outer shell and chlorine has 7. Both need a full outer shell to become stable. Because of this, the sodium atom loses its only electron in its outer shell to become a sodium ion and the chlorine atom gains the electron to become a chlorine ion as well. Because of this, both ions have a full outer shell, rendering them stable.

Now, because the sodium ion is short of one electron, it has more protons than electrons, resulting in it having a positive charge. The chlorine ion is the opposite, having a negative charge.

Answer:

This did not change the latex/composition of the balloon it just filled and went out.

Explanation:

Its the same way you fill a container without it being a chemical change.

A moist red litmus paper is used for testing ammonia gas  because ammonia is a base which turns moist red litmus paper blue.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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Answer:

It's mutualism I am pretty sure

I hope this helps :)

Answer: 278.966

Explanation: You can also approximate the number to 278.97

Answer:

3 we have three states of matter

Answer:

We have THREE (3) states of matter namely;

*Solid state

*Liquid state

*Gaseous state

Answer:

ok how about you answer my question, why would a moderator delete ALL of my answers to peoples questions?! now i have negatove points. smh

Explanation:

ugh sorry -_-

Answer:2.Plants have oxygen in them they also breathe oxygen and help the climate 3.there are all kinds of plants but the very first plant was a tree. 4. You might think plants are genetal normally they are but some types of plants can be very feisty such as the plant that eats stuff like actually opens it mouth some people think this is amazing and can lead to bigger things.! 5. Normally you see the pants normal size like little and pretty but there is enormous plants around the world that can get up to as big as a couch or bigger.

Explanation:

Sorry if I did bad lol

Answer: 2700J

Explanation:

Answer:

Their weight.

Explanation:

Weight is the measurement of gravity pushing you down, so with less gravity there would be less weight.

The astronauts expect their weight to be different on the Moon

Weight is simply defined as the gravitational pull of the earth on an object. It is measured in Newton.

The weight of an object varies with location because of gravity.

The weight of an object is related to it's mass according to the following equation:

Weight = mass × Acceleration due to gravity

Since the gravity of the Moon is lesser than that of the Eearth, the astronauts certainly knew that their weight will be different on the Moon.

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Answer:

The charge an element would have if it lost or gained electrons

Answer:

532 moles of O atoms.

Explanation:

Given data:

Number of moles of oxygen atom present = ?

Number of molecules of N₂O₅= 6.41×10²⁵ molecules

Solution:

First of all we will calculate the number of moles of N₂O₅.

1 mole = 6.022×10²³ molecules

6.41×10²⁵ molecules × 1 mol /6.022×10²³ molecules

106.4 mol

Number of atoms of O:

1 mole of N₂O₅ contain 5 moles of O atoms.

106.4×5 = 532 mol

Answer:

100008

Explanation:

The v/v concentration of 160ml pure acetic acid in 650ml solution is 24.61 %.

There is 160ml of pure acetic acid in the 650 ml solution of acetic acid.

The volume/volume concentration of acetic acid can be calculated as:

Volume/Volume = [tex]\rm \frac{volume\;of\;acetic\;acid}{Volume\;of\;solution}\;\times\;100[/tex]

v/v = [tex]\rm \frac{160}{650}\;\times\;100[/tex]

v/v = 0.2461 [tex]\rm \times[/tex] 100

v/v = 24.61 %

The concentration of pure acetic acid in the 650 ml solution is 24.61 % (v/v).

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Answer:

c .

Explanation:

Answer:

c

Explanation:

A decrease in velocity occurs at point D to E in the given displacement - time graph.

Velocity is defined as the time rate of change of displacement with time. It is measured in meters per second.

A decrease in velocity occurs when there is a small change in displacement at a large amount of time.

v = Δx/Δt

v = (60 - 40)/(60 - 40) = 1 m/s

v = (60 - 60)/(80 - 60) = 0 m/s

Thus, a decrease in velocity occurs at point D to E in the given displacement - time graph.

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Answer:

Bromine

Explanation:

It's the halogen color on the periodic table of elements.

Answer:

Bromine

Explanation:

Answer:

1.33 × 10²⁴ molecules CO₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

97.3 g CO₂

Step 2: Define conversions

Avogadro's Number

Molar Mass of C - 12.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol

Step 3: Convert

[tex]97.3 \ g \ CO_2(\frac{1 \ mol \ CO_2}{44.01 \ g \ CO_2} )(\frac{6.022 \cdot 10^{23} \ molecules \ CO_2}{1 \ mol \ CO_2} )[/tex] = 1.33138 × 10²⁴ molecules CO₂

Step 4: Check

We are given 3 sig figs. Follow sig fig rules.

1.33138 × 10²⁴ molecules CO₂ ≈ 1.33 × 10²⁴ molecules CO₂

Answer:

the forth one i think

Explanation: