Fluorine-18 undergoes positron emission as shown:
18 F + 4x +48
Enter the appropriate values for A and Z and the chemical
symbol for X
A:
Z:
83
1
X:
Answer:Answer:
40-18 fl =>40-cl+cl+0-1e sorry if im rong
Explanation:
When [tex]^1^8F[/tex] undergoes positron emission, the product nucleus is, [tex]^1^8O[/tex].
What is a positron emission?In positron emission, also called positive beta decay (β+ decay), a proton in the parent nucleus decays into a neutron that remains in the daughter nucleus, and the nucleus emits a neutrino and a positron, which is a positive particle like an ordinary electron in mass but of opposite charge.
When a proton is converted into a neutron then the positron emission takes place as follows.
[tex]^1_1p\;\rightarrow\;^1_0n\;+\;^0_+1e[/tex]
A positron is represented by the symbol. Therefore, when a positron emission occurs then the resultant nuclei atomic number decreases by a unit mass.
The general equation representing positron emission is as follows.
[tex]^M_ZA\;\rightarrow\;^M_Z_-_1 B\;+\;^0_+1e[/tex]
Hence, fluorine-18 decays by positron emission as follows.
[tex]^1^8_9F\;\rightarrow\;^1^8_8n\;+\;^0_+1e[/tex]
Therefore, when [tex]^1^8F[/tex] undergoes positron emission, the product nucleus is, [tex]^1^8O[/tex].
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pls answer thisss it's due today
Answer:
1.correct
3.correct
Explanation:
pls mark me as brainliest
Answer:
I believe A is the correct answer.
Explanation:
I note that another response includes C. as another correct answer. It is possible, but it depends on what is meant by "fixed shape." I interpret "fixed shape" as the collection of the gases forming a fixed shape on their own. Gases fill the container they are in (be it a flask, room, or a planet, so they have a fixed shape by that definition. But a primary definition of gases is that that take on the shape of their container, not a shape of their own.
A. is correct because perfect gases have no interactions (AKA the Ideal Gas Laws). They may have interactions, and often do, but they are weak. That's why the ideal gas laws are a good first approximation to how gases change volume based on temperature and pressure.
How much does the universe(galaxy) weigh?
Answer: Universe
Mass of ordinary matter
The mass of the observable universe is often quoted as 1050 tonnes or 1053 kg. In this context, mass refers to ordinary matter and includes the interstellar medium (ISM) and the intergalactic medium (IGM). However, it excludes dark matter and dark energy.
Density (of total energy): 9.9×10−27 kg/m3 ...
Mass (ordinary matter): 1.5×1053 kg
Contents: Ordinary (baryonic) matter (4.9%); D...
Volume: 3.566×1080 m3
Explanation: Galaxy
around 1.5 trillion solar masses
Their answer: The galaxy weighs around 1.5 trillion solar masses. This number helps put in perspective how very small we are. Take, for instance, where stars in the Milky Way fit in.
the speed of sound is greater through a solid than through a gas because the molecules in a solid are
A. still
B. vibrating
C. farther apart
D. closer together
Will calcium metal react with chromium (III) chloride? Explain your answer
Calcium metal with chromium(III) chloride would react. Calcium metal is more reactive than chromium metal; therefore, putting calcium metal in chromium chloride would create a reaction, where as putting chromium metal in calcium chloride would not form any reaction.
I’m in science class right now and I need help on these questions
Answer:
hello
Explanation:
Enter the correct ground-state (or lowest energy) configuration based on the number of electrons: 1s^4 2s^4 2p^12.
Express your answer in complete form in the order of orbital filling as a string without blank space between orbitals.
Answer:
The ground state configuration is the lowest energy, most stable arrangement. An excited state configuration is a higher energy arrangement (it requires energy input to create an excited state). Valence electrons are the electrons utilised for bonding.
or the
FIGURE 5.9 The arrow shows a second way of remembering the order in which sublevels fill. Table 5.2 shows the electron configurations of the elements with atomic numbers 1 through 18.
Element Atomic number Electron configuration
sulfur 16 1s22s22p63s23p4
chlorine 17 1s22s22p63s23p5
argon 18 1s22s22p63s23p6
or the
Two electrons
Two electrons fill the 1s orbital, and the third electron then fills the 2s orbital. Its electron configuration is 1s22s1.
Explanation:
Choose your answer
brainlilest me
CARRY ON LEARNING
Select all the correct answers.
In the cathode ray tube experiment, J.J. Thomson passed an electric current through different gases inside a cathode ray tube in the presence of
an electric field. In which two ways did this experiment change scientists' understanding of the atom?
O It showed that atoms combine in different proportions.
O It showed that atoms can be divided into smaller parts.
M It showed that all atoms of the same element are similar.
D
It showed that individual atoms could be destroyed
showed that all atoms contain electrons.
The two ways the cathode ray tube experiment changed scientists'
understanding of the atom was it showing that atoms can be divided into
smaller parts and all atoms contain electrons.
J.J Thompson was the scientist which performed the cathode ray tube
experiment and was able to ascertain it was negatively charged as a result
of it being deflected to the positive electrode.
His observation showed that the atoms contain sub-atomic particles called
electrons which are negatively charged.
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The reaction below is at dynamic equilibrium. Upper N subscript 2 (g) plus 3 upper H subscript 2 (g) double-headed arrow 2 upper N upper H subscript 3 (g). Which statement is true for the equilibrium system? The concentration of NH3 is greater than the concentration of N2. The concentration of NH3 equals the concentration of N2. The rate of the forward reaction equals the rate of the reverse reaction. The rate of the forward reaction is greater than the rate of the reverse reaction.
For the reaction below at dynamic equilibrium, it is true that the rate of the forward reaction equals the rate of the reverse reaction.
Let's consider the following reaction at equilibrium.
N₂(g) + 3 H₂(g) = 2 NH₃(g)
What is the chemical equilibrium?Is a state in which the concentrations of reactants and products are constant and the forward reaction rate and constant reaction rate are equal.
What is the equilibrium constant?The equilibrium constant (K) is the ratio of the concentrations of the products to the concentrations of the reactants, all raised to their stoichiometric coefficients.
Let's consider which statement is true for the equilibrium system.
The concentration of NH₃ is greater than the concentration of N₂. FALSE. There is not enough information to confirm this, we would need to know the value of K.The concentration of NH₃ equals the concentration of N₂. FALSE. There is not enough information to confirm this, we would need to know the value of K.The rate of the forward reaction equals the rate of the reverse reaction. TRUE. This is always true for a reaction at equilibrium.The rate of the forward reaction is greater than the rate of the reverse reaction. FALSE. At equilibrium, both rates are equal.For the reaction below at dynamic equilibrium, it is true that the rate of the forward reaction equals the rate of the reverse reaction.
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Answer:
C
Explanation:
edg
Why is there a large difference between day and night temperatures in a desert?
All rainfall in a desert happens at night.
There are no plants to trap the heat.
Heat escapes rapidly at night because the air is so dry.
The ground absorbs all heat. 20 points :,)
Answer: Heat escapes rapidly at night because the air is so dry.
Explanation: The desert has little humidity and rarely is cloudy. These two factors allow the desert to heat up rapidly during the day and cool off quickly at night.
write the correct name of the Fe(CIO3)3
Answer:
Iron(III) Chlorate Fe(ClO3)3 Molecular Weight
Explanation:
Answer: Iron(III) Chlorate should be it
why does adding lemon juice to blueberry smoothie make it change colour from purple to pink
Please help! i will give brainliest!
When a solid air freshener gets smaller over time and runs out is it a physical change or chemical change? please say why?
Answer:
i think this would be an example of a physical change because here the substance is changing directly from a solid to a gas without passing through the liquid state which means that the composition of the substance has not changed and remains the same. This is also called sublimation.
When 0.019 mol of aluminum sulfate are dissolved in enough water to make 905 milliliters of solution, what is the molar concentration of aluminum ions? Answer in units of M
1) Loudness and pitch are two important properties of a musical sound
a) If a musician plays a softer note, Which property has been changed, loudness or pitch?
b) If the musician makes the note lower , which property has been changed loudness or pitch
Answer:
a)loudness has been changed
b) pitch has been changed
A little help here please
Answer:
Prokaryotic Cells:
- Bacteria
- Unicellular Organisms
- DNA as genetic material
- Ribosomes
- Do not have membrane bound organelles
- Always contain cell wall
Eukaryotic Cells:
- Contains organelles
- Have membrane bound organelles
- Unicellular Organism
- DNA as genetic material
- Ribosomes
- Have loose strand of DNA
- Has nucleus
- Multicellular Organism
- Plant cell
- Animal cell
Explanation:
I have separated them and made the common characteristics in bold. I cannot guarantee that it is correct, these are my educated estimates.
In the following experiment, a coffee-cup calorimeter containing 100mL OF H2O is used.
Please provide more of the question so I am able to answer, but I do know that H20 has 0 calories.
If two atoms have an electronegativity difference of 1.3, what type of bond would form between them?
Select one:a. non polar covalent b. polar covalent. c. ionic
Answer:
I would say iconic bond
Explanation:
how do the prefixes of the –saccharide words relate to the structure of the sugar?
Answer:
The prefixes tell you how many of each there are.
Explanation:
So for this example, mono would mean there is one sugar, di meaning 2 sugars and so on. Hope this helped!
Here is a table:
mono- 1 hexa-6
di-2 hepta- 7
tri- 3 octo- 8
tetra- 4 nona- 9
penta - 5 deca- 10
magine that you are a water molecule in a group of many water molecules. Write a letter to a friend telling them about your journey through the water cycle on Earth. You can begin your journey anywhere you’d like, but you must complete an entire cycle and end the journey where you began. Write your letter in complete sentences. Use each of the following terms correctly in your letter: • condensation • evaporation • precipitation • collection (HELP PLS ILL GIVE 54 points *all my points* AND GIVE BRAINLIEST HELP PLS)
Answer:
Explanation:
One day I was sitting on a leaf, in the early morning if a Tuesday, and I was just relaxing there. I then heard Bob( the water molecule next to me) say that he heard it was going to get pretty hot today. As the day went on I started to get pretty warm and I starting to evaporate and fly into the sky! It was really weird to see the world from up high. I stayed up there bouncing between clouds with Bob for a few hours, until the wind started to pick up and it got colder. I then started to shiver and began condensing with the other water molecules (and Bob). As it got colder we began to plummet to the earth really fast in the precipitate form of a water droplet. We hit the ground with a big ker-plop! I looked around me and we weren't the only ones. A bunch of other droplets had started to collect and form a puddle.
Hope this helps!
What is the main cause of global convection currents?
A. Deforestation
B. The Greenhouse effect
C. The increase in the number of cities
D. Uneven heating of the Earth by the sun
Answer: The answer is D, uneven heating of the Earth by the Sun.
when an acid and alkali react to form water and salt
Answer:
Neutralisation involves an acid reacting with a base or an alkali, forming a salt and water.
Cu(OH)₂ +H₃PO₄ = Cu₃(PO₄)₂+H₂O
how do i balance this equation
balanced equation =
3Cu(OH)2 + 2H3PO4 → Cu3(PO4)2 + 6H2O
how do I know which substance is being reduced?
Which molecule has ionic bond?
Mg
C0
NaCl
N0
NaCl - Chlorine has an outer shell with 7 electrons it wants to gain from the Sodium to become stable, whereas the Sodium wants to lose an electron to become stable.
which of these gaseous elements is least reactive hydrogen helium nitrogen or oxygen
Answer: Nobel gases
i dont know what the options were but i hope that helped
Hellpppppppppppppppppppppp
Answer:
SnH4
Explanation:
Because the melting point of SnH4 is higher than CH4
A titration process is done by using 0.2M of 20 ml of third analytical group main reagent solution with 0.1 M nitric acid solution if nitric acid is replaced by sulphuric acid of same concentration, then the volume of sulphuric acid equals ……
Half the volume of nitric acid
Double the volume of nitric acid
The volume of nitric acid
Quarter the volume of nitric acid
Sulfuric acid undergoes dissociation reaction to produce twice the amount
of hydrogen ions produced by nitric acid in solution.
The volume of sulfuric acid equals; Half the volume of nitric acidReasons:
The concentration of the analytical group = 0.2 M
Volume of reagent = 20 ml
Concentration of the nitric acid to be replaced = 0.1 M
Replacement for the nitric acid = Sulfuric acid
Concentration of the sulfuric acid = Concentration of the nitric acid = 0.1 M
Reaction = Titration
Solution:
Sulfuric acid in solution gives; H₂SO₄ (aq) ⇄ 2H⁺ (aq) + SO₄²⁻(aq)
For nitric acid, we have; HNO₃ (aq) ⇄ H⁺(aq) + NO₃⁻(aq)
Therefore;
1 mole of sulfuric acid gives 2 moles of hydrogen ions
0.1 M solution of sulfuric acid gives 0.2 moles of hydrogen ions per liter
0.1 moles of hydrogen ions are therefore present in half a liter solution of 0.1 M sulfuric acid solution.
However;
0.1 M of nitric acid gives 0.1 moles of hydrogen ions per liter
Therefore;
The volume of sulfuric acid required = Half the volume of nitric acidLearn more about titration and quantitative chemical analysis here:
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explain the concept of kenetic molecular theory
Help asap plsss ! Last question
Answer:
H20
Explanation:
Because H20 has hydrogen bonding and this is one of the strongest IMF