Answer:
fluorine
Explanation:
Electronegativity varies in a predictable way across the periodic table. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative
what makes viruses so dangerous and vaccines so importent
Answer:
they are very dangerous.
Explanation:
they cause disease in humans, animals, crops, and can cause permanent damage to immune systems.
Answer:
viruses can shut your immune system and infect blood cells thus killing you. vaccines will provent this by prepering your immune system so when you get said virus, it will reduce your chance of death
Explanation:
im not smart with health but i hope this is correct!
What is the definition of a covalent bond?
1. A bond between two positive ions
2. A bond between a positive and a negative ion
3. A bond between two negative ions
4. A bond between two atoms
Answer:
4. A bond between two atomsExplanation:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously 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.
the average single and double n-o bond lengths are 136 pm and 122 pm, respectively. assuming these two structures were to make equal contributions to the observed bonding in hno2, predict the n–o bond length.
Resonance structures show that chemical species have equal bond lengths and bond angles when in resonance. The bond lengths of the N - O bond in HNO2 is 126pm.
Linus Pauling introduced the idea of resonance to explain the nature of bonding in compounds and ions where a single Lewis structure can not satisfactorily account for the observed properties of the chemical species.
If the two structures are resonance structures, they will have equal N - O bond lengths and bond angles. The bond length will be intermediate between that of a pure N - O single and N - O double bond. The actual N- O bond lengths in HNO2 are obtained as; 136 pm - 122 pm/2 = 126 pm.
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When a cold air mass crashes into a warm air mass, which kind of front is formed?
Answer:
Occluded front
Explanation:
An occluded front usually forms around a low pressure system. The occlusion starts when a cold front catches up to a warm front. The air masses, in order from front to back, are cold, warm, and then cold again. Coriolis Effect curves the boundary where the two fronts meet towards the pole.
*
Identify the element found in the f-block.
Cm
K
W
Br
Ag
The word "polar" means that the air mass is __________. *
A. warm
B. cold
C. lukewarm
D. stable
Answer:
cold
Explanation:
Weather is created by the movement and interaction of air masses of different temperatures. ... Air masses are commonly classified according to four basic source regions with respect to latitude. These are Polar (cold), Arctic (very cold).
giúp mik giải hoá vs mik đag cần gấp
Answer: với những bài không biết bảo toàn e thì bạn có thể dùng bảo toàn nguyên tố cũng được, với pt hữu cơ thì ưu tiên cân bằng C, H trước rồi tới O
Explanation:
Frank has a paper clip. It has a mass of 9g and a volume of 3cm³. What is the density
In the system model, the direction of the
arrow tells you that
Answer: Answer b
Explanation:
Balance the equation H2SO4+NaOH = H2O+NaSO4
Answer: H2SO4 + 2NaOH = Na2SO4 2H2O
Explanation: The ChemicalAid website is very helpful if you need to balance chemical equations.
Why do certain Snurfles not survive?
What is the balanced chemical equation for the combustion of iron
Answer:
iron + oxygen → iron oxide. 4 Fe + 3 O2 → 2 Fe2O.
How do valence electrons impact the type of bonds an atom makes?
An atom wants an empty outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
A large number of valence electrons means the atom will share electrons; a small number of valence electrons leads to transferring from one atom to another.
A small number of valence electrons means the atom will share electrons; a large number of valence electrons leads to transferring from one atom to another.
An atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs.
Use your knowledge of valence electrons and how they affect bonds to figure out how carbon (Group 14) and oxygen (Group 16) would be attached to one another. In carbon dioxide (CO2), how is the compound structured? (Use “–” to represent a single bond and “=” to represent a double bond.)(1 point)
O=C=O
C=O–O
C–O–O
O=C–O
Methane’s chemical formula is CH4. Is there a bond between any of the hydrogen atoms? Why or why not?
Yes, there is because there are one too many hydrogen atoms for carbon to handle alone, so one hydrogen must bond with another.
No, there is not because carbon needs four bonds, so it bonds with each hydrogen atom; hydrogen only forms one bond.
No, there is not because it would form H2 instead of methane if hydrogen bonded with itself.
Yes, there is because they form a long chain in order to all have stable outer energy shells.
In hydrogen peroxide (H2O2), which option best shows how the atoms are ordered?
H–O–O–H
O–H–H–O
H–O–H–O
O–H–O–H
Answer:
1) two
2) an atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs
3) O=C=O
4) No, there is not because carbon needs four bonds, so it bonds with each-
5) H-O-O-H
Explanation:
Answer: 1) two
2) an atom wants a full outer shell of valence electrons, so it will either transfer or share electrons depending on what the other atom needs
3) O=C=O
4) No, there is not because carbon needs four bonds, so it bonds with each-
5) H-O-O-H
The faster the particles, the
______ the temperature.
Less forceful
Slower
Higher
Lower
Answer:
When for example, heating up an ice cube the particles of the ice start to vibrate fast enough to get separated into liquid caused from high temperature. So the answer is Higher.
Magnesium reacts with hydrochloric acid to form hydrogen gas according to the equation below. If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium, calculate how many moles of hydrogen gas (H2) will be produced. Use the stoichiometry road map to first convert the mass of Mg into moles of Mg
3 moles of hydrogen gas (H2) will be produced If sufficient hydrochloric acid is used to react completely with 72.9 g of magnesium.
The chemical reaction described in the question is represented in the following equation:Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)According to this equation, 1 mole of magnesium produces 1 mol of hydrogen gas. First, we convert 72.9g of Mg to moles using the following formula:moles of Mg = 72.9g ÷ 24.3g/molmoles of Mg = 3 molIf 1 mole of magnesium produces 1 mol of hydrogen gas. Therefore, 3 moles of Mg will produce 3 moles of hydrogen gas.Learn more: https://brainly.com/question/14919968?referrer=searchResults
jelani and Mikah are watching an approaching storm from their living room window. All of a sudden they see a bright flash of lightning that is soon followed by clap of thunder. what causes lightning? describe each step involved in the forming of lightning and give an example of a simile process from every day life
Answer: Heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
A accumulation of static charge inside a storm cloud causes lightning.
What is lightning?Lightning is a massive electrical discharge that originates in the atmosphere between clouds, the air, or the earth.
In a rain cloud, lightning begins as static charges.
At the peak of the cloud, lighter, positively charged particles form. The cloud's heavier, negatively charged particles settle to the bottom. A massive spark, or lightning, develops between the two charges within the cloud when the positive and negative charges get large enough.
Step involved in the forming of lightning:
The collision of water droplets with ice crystals in the upper atmosphere occurs due to the rapid rise of the air. These collisions generate static electricity, which charges the clouds. Huge sparking occurs between the clouds or between the clouds and the ground as a result of this. This is referred to as lightning.
Example, Nylon clothes
Static electricity is produced when nylon clothing is rubbed against another fabric or against the wearer's skin.
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Calculate the wavelength (m) of light that has a frequency of 2.17 × 10^11 s-1
a) 1.38*10^-3
b) 6.51*10^19
c) 1.44*10^-22
d) 1.44*10^22
e) 1.38*10^3
f) none of the above
Answer:
e
Explanation:
wavelength = speed of light/frequency
wavelength = 3 x 10^8/2.17 x 10^11
wavelength = 1.38x10^-3m
Explain why the sodium ions and chloride are attracted to each other.
Answer: The reason a bond is formed between chloride ions and sodium ions is because they have opposite charges. TRUE: the opposite charges attract them together, and this force of attraction is the ionic bond.
Explanation:
What is Protein coat
Answer: virology) A coat of proteins surrounding the nucleic acid of a virus. Supplement. The protein coat is made up of protein subunits called capsomere. Additional layer of lipid molecules may envelope the protein coat.
Explanation:
Of the groups given, which are the least chemically reactive?
Group 1A elements
Group 7A elements
Group 2A elements
Group 8A elements
Answer:
Group 8A
Explanation:
This is because the elements in Group 8A is stable, what I mean is this elements have the maximum number of electrons in there last orbit so they dont need to form any compund with any other element in the periodic table.
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What does it mean that the filtered water samples reacted with phenolphthalein?
Answer:
Phenolphthalein is an acid indicator, which means when we add water (pH 7) to it, it ionizes giving a pink color. We all know acid gives in solution. When we add phenolphthalein to acid due to the common ion effect concentration increases. turned the solution pink.
Explanation:
Is both CALCIUM HYPYCHLORIDE & CALCIUM OXYCHLORIDE same?
I really need the chemical name of Bleaching powder
PLSSSSS HELP/......
Will mark Brainliest.......
Answer:
Yes they are..... Both are the names of the same thing
Sequence Examine the periodic table.
Which four pairs of elements would be
reversed in order if the elements were
listed by increasing atomic mass instead of
increasing atomic number?
Answer:
Notice that tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).
The tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because he knew that the properties of iodine were much more similar to those of fluorine (F), chlorine (Cl), and bromine (Br) than they were to oxygen (O), sulfur (S), and selenium (Se).
What things are in the periodic table?The periodic table is a tabular Form of the chemical elements classified by atomic number, from the element with the least atomic number, hydrogen, to the element with the most atomic number.
The atomic number is the number of protons in the nucleus of an atom.
Thus, The tellurium is listed before iodine even though its atomic mass is higher. Mendeleev reversed the order because of its properties.
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Please show work for these
Answer:
yes
Explanation:
yes I am genius yygggh
What is the difference between concrete and cement?
Answer:
cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. ... Cement comprises from 10 to 15 percent of the concrete mix, by volume.
What happened to the colored water and to the paper ambot after poking the plastic covering the glass? ( experiment current affairs) guyss pls help me.
Answer:
ok ok ok ok ok ok ok ok ok ok ok ok ok ikjk
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Explanation:
fgghhh
If the electron is more attracted to the nucleus why does that mean the IE is greater
Answer:The bigger the atom the lesser the ability of the atom to hold on to its valence electrons.
Explanation:
The larger the atom, the lesser the tendency for the atom to withhold its valence electrons.
The size of an atom is usually estimated in terms of its atomic radius. Across the period in the periodic table, the atomic radius decreases progressively from left to right. This is due to the progressive increase in the nuclear charge (i.e., the number of protons in the nucleus) without an attendant increase in the number of electron shells.
Similarly, down the group, the atomic radius increases progressively from top to bottom due to the successive number of electrons' shells.
Thus, the larger the atom's radius, the smaller the Ionization energy because of the increasing shielding effect of inner shell electrons on the electron to be removed from the nuclear attraction.
Finally, we can conclude that as the atom becomes larger, the tendency to withhold the electrons on the outer shell decreases due to distance and the shielding/ screening effect.
The force excerted by air molecules in all directions is called
How do you determine the number of electrons?Question 4 options:It is equal to the protons + the atomic numberIt is the atomic mass + the atomic numberIt is equal to the protons in a neutral atomIt is equal to the atomic mass
Answer:
3rd answer - It is equal to the protons in a neutral atom.
Explanation:
Always,
No. of protons = No. of electrons
Therefore, we can conclude that the answer is the 3rd answer.
What is the end result
of diffusion?
Answer:
The End Result Of Diffusion Is An Equal Concentration, Or Equilibrium, Of Mocules On Both Sides Of The Membrane.
Explanation:
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