a compound is a substance composed of two or more elements in a fixed ratio. true or false?
Answer:
its true..plz mark me brainliest
Explanation:
How do the atoms aluminum and fluorine react to form the compound aluminum fluoride?
Answer:
Aluminum fluoride is an ionic compound. Meaning that the two elements form a ionic bond. In ionic bonding, atoms receive and donate electrons in order to become stable. In this case, aluminum donates its three outer electrons to three fluorine atoms. Aluminum forms a triple positive aluminium ion (Becomes a cation) and fluorine forms three single negative fluoride ions (Becomes a anion).
Aluminum (3+)Fluorine (1-)What are the four groups of carbon compounds found in living things?
HELP!!!!
four different liquid compounds in flasks at 20 C are represented above. the table below identifies the compounds. flask c shows the most particles in the vapor phase. which of the following is not shown in the model but best helps to explain why flask c must contain pentane
Answer: C , The strength of the intermolecular forces between the particles in the liquids.
Explanation:
Since we have 4 boiling flasks with liquids that are at a temp of 20⁰C and out of them all, flask C the has most amount of vapour Particles inside of it, because of that we can conclude that it has the weakest Intermolecular force out of the rest of the boiling flasks since at a temp of 20⁰C it has the most amount of gas particles compared with the other flasks, and not to forget the data in the graph shows us the formula and boiling point of flask C that contains pentane and from that data given we can tell that since the boiling point of pentane Is low then it has to have a weak intermolecular forces, causing it to have more vapour Particles than other flasks, proving the answer to be C since showing the strength of the attraction will explain everything we need to know about flask C and why does it have more vapour Particles than the other flasks.
Note:
(A) is not the answer since all the liquid particles in each flask are in random constant motion at a temp of 20⁰C so it does not justify why flask C has more vapour Particles.
(B) is not the answer since showing the relative speeds of each vapour Particle will not justify why flask C has the most amount of gas particles with the respect of its temperature.
(D) is not the correct answer since we already have data given in the graph about the boiling point of pentane and it's formula so showing the particulate representation is useless.
The best explanation is the strength of intermolecular force between the particles in a liquid. Thus option C is correct.
What is intermolecular force?Intermolecular force is defined as the attractive and repulsive force that rises between the molecules of a compound. They are electrostatic in nature.
There are basically five type of intermolecular force.
Dipole-Dipole interactionIon Dipole interactionIon induced dipole interactionDipole induced dipole interactionDispersion forceThe first three forces are collectively known as Vander wall force.
Thus, the best explanation is the strength of intermolecular force between the particles in a liquid. Thus option C is correct.
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What are all the chemical reaction takes place if Conc HNO3 acids leaks in seawater and at what dilution ratio it gets neutralized?
Answer:
Chemical formula: HNO₃
Melting point: −42 °C (−44 °F; 231 K)
Molar mass: 63.012 g·mol−1
Solubility in water: Miscible
Explanation:
When Conc HNO3 acid leaks into seawater presumed to be largely consisting of Sodium Chloride and other dissolved salts, I won't consider it as a chemical reaction rather it is a Physical Change. I presume this activity as a mixture when the acid been the solute becomes a contaminants
What are the consequences of increased nitrogen and phosphorus into water systems? (Site 3).
Answer:
But when there is too much phosphorus and nitrogen into water systems, it can speed up the process of eutrophication ( increase in the concentration of minerals and nutrients, which enhances the growth of algae, which causes algal blooms). Due to this, dissolved oxygen level is declined as not enough light penetrates in the water body.
Explanation:
What do you already know about throwing a curveball?
Answer: You have to have good mechanics as well as the curve with velocity and speed.
The MLB Pitchers you see can be an example.
Commentators yelling Nasty Curveball, Strikeout!!
Short definition of inclined plane
Answer:
inclined plane, a simple machine consisting of a sloping surface, used for raising heavy bodies. The force required to move an object up the incline is less than the weight being raised, discounting friction
Explanation:
The steeper the slope, or incline, the more nearly the required force approaches the actual weight. The steeper the slope, or incline, the more nearly the required force approaches the actual weight.
Describe the process of pasteurization?
Answer:
Pasteurization is a process in which packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to less than 100 °C (212 °F), to eliminate pathogens and extend shelf life.
How many moles of ammonium ions are in 125 mL of 1.40 M NH4NO3 solution? ________ moles (give answer with correct sig figs in units of moles without scientific notation)
The number of mole of ammonium ion, NH₄⁺ in the solution is 0.175 mole
We'll begin by calculating the number of mole of NH₄NO₃ in the solution. This can be obtained as follow:
Volume = 125 mL = 125 / 1000 = 0.125 L
Molarity = 1.40 M
Mole of NH₄NO₃ =?Mole = Molarity x Volume
Mole of NH₄NO₃ = 1.40 × 0.125
Mole of NH₄NO₃ = 0.175 moleFinally, we shall determine the number of mole of ammonium ion, NH₄⁺ in the solution. This can be obtained as follow:
NH₄NO₃(aq) —> NH₄⁺(aq) + NO₃¯(aq)
From the balanced equation above,
1 mole of NH₄NO₃ contains 1 mole of NH₄⁺
Therefore,
0.175 mole of NH₄NO₃ will also contain 0.175 mole of NH₄⁺
Thus, the number of mole of ammonium ion, NH₄⁺ in the solution is 0.175 mole
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what is electromagnetisim
Answer:
science of electromagnetic fields
Explanation:
(winks and runs off)
Please count compound list each element and the amount of each and then figure out the total of the atoms
NEED ANSWER ASAP
Answer:
Look at the formula.
Explanation:
Carbon: 10
Hydrogen: 14
Nitrogen: 2
10 + 14 + 2 = 26
Organic, its nicotine
Elements in the same period in the same periodic table have the same ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
Elements in the same period have the same number of electron shells; moving across a period (so progressing from group to group), elements gain electrons and protons and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.
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How many molecules are in 21.5G of water
Answer:
There are 6.022×1023 molecules in a mole. There are 18.01528 grams of water per mole of water. in 1g water
Explanation:
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how many electrons can there be in the 2p subshell?
Answer:
6 possible electron can fit into the 2p subshell
What is a single layer of graphite called
Asking for GCSE Chemistry
Answer:
GRAPHENE is a single layer of graphite
Explanation:
each carbon atom bonded to 3 other carbon atoms forming a hexagonal lattice
The diagram represents an atom of an element key
e = electron = 4
n = neutron = 5
p = proton = 4
Which symbol gives this information?
1. The particles present within the nucleus of an atom are called _______.
Answer:
Hey mate....
Explanation:
This is ur answer.....
Protons & NeutronsHope it helps!
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Answer:
the proton and the neutron
The particles present in the nucleus of an atom are the proton and the neutron.
Electrons are present outside the nucleus.
8)
What mass of hydrogen is needed to react with 32 g of copper oxide?
CuO + H2 → Cu + H2O
Answer:
1.22gram of hydrogen is needed to react
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.40 g mass of hydrogen is needed to react with 32 g of copper oxide.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
CuO + H[tex]_2[/tex]→ Cu + H[tex]_2[/tex]O
mole of copper oxide= 32 /79.54
=0.40 mole
The mole ratio between copper oxide and hydrogen is 1:1
mole of hydrogen= 0.40 mole
mass of hydrogen = 0.40 mole×1g/mol
= 0.40 g
Therefore, 0.40 g mass of hydrogen is needed to react with 32 g of copper oxide.
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How many elements are in the other metals group
Answer:
7 elements
Explanation:
Answer:
There are 7 elements
Explanation:
what viral components might serve as good targets for the design of antiviral chemicals?
Question 4 (1 point)
Model A
In the molecule above, the black circles are Carbon, the blue circles are Hydrogen
and the red circles are Oxygen. Which formula below is correct for this molecule?
C4H404
C2H402
Answer:
C2H4O2
Explanation:
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How much aluminum can be extracted from 3.5 metric tons of bauxite ore which is 70% aluminum oxide?
Answer:
A) 17.5%
B) 1) 2135 kg
2) 375 kg
C) 91.8
Explanation:
Part (A):
1 tonne= 1000 kg= 100%
Aluminium oxide= 825 kg= 82.5%
Iron (lll) oxide= 100 kg= 10%
Sand= 85 kg= 7.5%
That makes total of 100%
So, the percentage of impurities= Iron (lll) oxide + Sand
=> 10 + 7.5= 17.5%
Part (B):
(1) 1 tonne= 427 kg
Multiplying both sides by 5
=> 5 tonne= 427 * 5
=> 5 tonne = 2135 kg
(2) 1 tonne contains 75 kg sand as impurity
=> 1 tonne= 75 kg
Multiplying both sides by 5
=> 5 tonnes = 75 * 5
=> 5 tonnes = 375 kg
Part (C):
If all of the iron oxide was removed, then only aluminium and sand are left.
Aluminium = 825 kg
Sand= 74 kg
Total of them makes it:
=> 825 + 74 = 899
So,
% age of Aluminium= 825/899 * 100
% age of Aluminium= 0.918 * 100%
% age of Aluminium= 91.8%
Which of the following are elements? (Select all that apply.)
KCl
Na
C
H2O
Answer:
Na(Sodium) and C(Carbon) only
Answer:
Na, C
Explanation:
1. KCl, or potassium chloride, is a combination of two elements- so it's a chemical compound.
2. Na, or sodium, can be found on the periodic table of elements. Therefore, it is an element.
3. C, or carbon, can also be found on the periodic table of elements. Therefore, it is an element.
4. H20, or water, is a combination of 2 hydrogen atoms that bonded into an oxygen atom. Combination of 2 or more elements is a chemical compound.
Therefore, the answers are Na and C.
2. Which of the following statements is true about covalent bonding?
A It is the attraction of atoms for an electron
B it involves the losing and gaining of electrons
Cit involves the sharing of electrons
Dit involves the moving of electrons between energy levels
Answer:
C. it involves the sharing of electrons
Explanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
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what causes chemical change in the stomach?
Answer:
The chemical change in the stomach, known as food digestion, is from the enzymes in the liver and stomach where they break down food molecules into even smaller molecules in order for them to be digested more easily.
Chlorine and oxygen form many different compounds, including CIO, and Cl2O3. How do the names of these compounds differentiate one chlorine oxide from another?
Answer:
We can mix two compounds and create a third that bears little resemblance to its parents. For instance, by mixing two parts of hydrogen gas with one of oxygen - liquid water is formed. We should not be misled by the fact that chlorine and chlorine dioxide share a word in common. The chemistries of the two compounds are completely different.
Chlorine and chlorine dioxide are both oxidizing agents (electron receivers). However, chlorine has the capacity to take in two electrons, whereas chlorine dioxide can absorb five. This means that mole for mole, ClO2 is 2.6 times more effective than chlorine.
If equal, if not greater importance is the fact that chlorine dioxide will not react with many organic compounds, and as a result, ClO2 does not produce environmentally dangerous chlorinated organics. For example; aromatic compounds have carbon atoms arranged in rings and they may have other atoms, such as chlorine, attached to these rings, to form a chlorinated aromatic - a highly toxic compound that persists in the environment long after it is produced.
Chlorine dioxide's behaviour as an oxidizing agent is quite dissimilar. Like ozone, the predominant oxidation reaction mechanism for chlorine dioxide proceeds through a process known as free radical electrophilic (i.e. electron-attracting) abstraction rather than by oxidative substitution or addition (as in chlorinating agents such as chlorine or hypochlorite). This means that chlorinated organic compounds such as THMs and HAAs are not produced as a result of disinfection using chlorine dioxide
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The way that the names of these compounds show that the Chlorine oxides are different is by making reference to the number of individual molecules in the compound.
How are the chlorine oxides differentiated?The number of chlorine and oxygen molecules in each compound are used to name the compounds which ensures that they are differentiated.
ClO₂ is called "Chlorine Dioxide" which shows that there are two Oxygen atoms.
Cl₂O₃ is called "Dichlorine Trioxide" which shows that there are two Chlorine molecules and 3 Oxygen molecules.
Find out more on Chlorine oxides at https://brainly.com/question/25937152.
What is the frequency of radiation whose wavelength is 2.40×10
Answer:
24
Explanation:
2.40*10=24.0
Which of the following terms is a chemical substance made of a single type of atom that cannot be broken down into a simpler substance?
A- nucleus
B- molecule
C- Compound
D- Element
Determine the pH of 7.53 x 10-4 mol/L calcium hydroxide solution
Answer:
pH = 11,17
Explanation:
[tex][OH^{-} ] = \frac{n_{OH^{-} } }{V} = \frac{2n_{Ca(OH)_{2} } }{V} = 2[ Ca(OH)_{2} ]\\[/tex]
[tex]Ca(OH)_{2}[/tex] → [tex]Ca^ {2+}[/tex] + [tex]2OH ^ -[/tex]
[tex]7,53.10^-4[/tex] → [tex]7,53.10^-4[/tex] → [tex]1,506^-3[/tex]
pOH = -log [[tex]OH^-[/tex]] = [tex]-log 1,506^{-3}[/tex] ≈ 2,822
pH = 14- pOH = 14-2,822 = 11,178