Answer: The electron, discovered in 1897 by J. J. Thomson, was the first subatomic particle to be observed. The nucleus of ordinary hydrogen was understood to be a single proton after the nucleus of the atom was discovered in 1911 by Ernest Rutherford. In 1932, a neutron was detected.
You have the compound CH4. The first element is a
(metal, nonmetal) and the second element is a
(metal, nonmetal). You would predict that this would form a(n).
(ionic, covalent) bond.
Answer:
1. Nonmetal
2. Nonmetal
3. Covalent
Explanation:
Methane is the molecule being described in this question. It has a chemical formula of CH4 where four hydrogen atoms are bonded to one central carbon atom. Carbon as well as hydrogen are non-metallic elements, which means that they can only share their valence electrons to form a COVALENT BOND.
A covalent bond is a type of chemical bond in which two atoms share their valence electrons. It occurs between two non-metallic atoms. In this molecule, CH4, carbon and hydrogen share their valence electrons to form a covalent bond.
Is this a redox reaction? give evidence (many points plz answer)
2Mg + CO2 → 2MgO + C
Answer:
[tex] \boxed{yeah}[/tex]
Explanation:
[tex]CO_2 \: is \: reduced \: to→C \: by \: 2M_g \: (the \: reducing \: agent): while \\ 2M_g \: is \: oxydized \: to→2M_gO \: by \: CO_2 \: (the \: oxydizing \: agent)[/tex]
2. A pharmaceutical chemist runs a chromatography test on a substance
and identifies two of its components by comparing their Ry values
against certain standards. If the two components have Rf values of 1.0
and 0.41, and the solvent front has travelled 12.0 cm from the sample's
origin, what is the separation distance on the chromatogram?
Answer:
7.08 cm
Explanation:
For number 1;
Rf = d1/d2
d1/12 cm
Rf = 1.0
d1 = 12 * 1
d1 = 12.0 cm
For number 2
Rf = d1/d2
Rf = 0.41
0.41= d1/12
d1 = 0.41 * 12
d1 = 4.92 cm
Separation distance= 12.0 - 4.92 = 7.08 cm
Why aren't acid-base reactions considered redox reactions, even though they involve the transfer of hydrogen atoms?
Answer: Acid/base and precipitation reactions almost always are NOT redox reactions. For redox to have happened, the number of electrons that an element has must change (i.e. its oxidation state must change). ... But the hydrogen ion never "has" any electron throughout the process and remains in a +1 oxidation state.
Explanation:
let me know if that helped...(☞ﾟヮﾟ)☞
Acid-base reaction is not a redox reaction, since the oxidation number remains unchanged in acid-base reaction.
What is acid-base reaction?An acid-base reaction is the chemical reaction that occur when acids and bases react together.
What is redox reaction?Redox reaction is a reaction that involves the transfer of electrons between the atoms, ions, or molecules.
Acid-base reactions involve the transfer of hydrogen ions between reactants. Redox reactions involve a change in oxidation number for one or more reactant elements.
Redox reactions involve a change in oxidation number for one or more reactant elements.
Acid-base reactions involve a transfer of a hydrogen ion instead of an electron and the transfer of an H+ ion leaves the oxidation numbers unaffected.
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Which has a larger impact on change in atomic size: moving down one period or moving across a family
Answer:
hi this my first day, also the answer is moving one period :)
R4te me for 10 points and be honest with me PLEASE
Answer:
id give you and 8 or 9 but you are really pretty tho
Explanation:
What happens when chlorine solution is added to a solution of sodium bromide?
A)No reaction
B)An explosion
C)Bromine is produced
Answer:
Sodium chloride is produced
Answer:
b
Explanation:
Substances that are good conductors of heat and electricity at room temperature usually
have delocalized electrons moving freely from atom to atom. Which type of bonding
occurs in these substances?
O covalent
electric
ionic
metallic
ASAP PLEASEE
Answer:
the answer is electric
Explanation:
i think so
What is the temperature in kelvin of a gas if it is allowed to expand from 1.50 L to 4.50 L? The initial temperature is 10.0°C and pressure is constant throughout the change.
Which equation should you use?
StartFraction V subscript 1 over T subscript 1 EndFraction equals StartFraction V subscript 2 over T subscript 2 EndFraction.
T subscript 2 equals StartFraction V subscript 1 over V subscript 2 EndFraction T subscript 1.
T subscript 2 equals StartFraction V subscript 2 over V subscript 1 EndFraction T subscript 1.
Answer:
first question is the third option and the second question is 849K.
Explanation:
Answer:
third option
849K
Explanation:
Sodium bicarbonate is the chemical name for baking soda. Its chemical formula is NaHCO3. What does the subscript 3 mean?
Answer:
'3' in NaHCO₃ is the number of moles oxygen in 1 mole of sodium bicarbonate
Explanation:
see above note.
C.
There Are Three Atoms Of Oxygen In Sodium Bicarbonate.
_______
I Got It Right On The Test, Hope It Helps :)
I need help in this questions
Answer:
just use calculator mannn
Question 1 (1 point)
If PV = nRT, then if I increase the amount of moles of a gas in a glass jar,
and the temperature of the gas stays the same,
and volume of a jar obviously stays the same,
what will happen to pressure inside the jar?
Answer:
The pressure also increases.
Explanation:
As we can see in this equation,
Pressure is directly proportional to the moles of a gas in the glass jar.
Temperature and Volume remains constant.
Hence, if number of moles of a gas increases, the pressure also increase "n" number of times.
Put this equation into word form.
Answer:
2
Explanation:
symbol of postassium is k and there is no symbol k. so i guess no2
1. Which of the following statements is true about seeds?
a. Every plant produces seeds.
c. All seeds are good to eat.
b. All fruits contain many of seeds. d. all seeds has young plant, stored food and a seed coat.
2. Flowers cannot usually produce seeds unless
a. they are visited by insects.
c. they produce nectar.
b. they are on plants growing in good soil. d. the right pollen is placed on their stigmas.
3. Fertilization take place before a seed develops. Which statement describes when fertilization
occurs?
a pollen grain falls on a pistil
c. sperm in a pollen joins with an egg cell in an ovule
b. a pollen tube enters an ovary
d. an ovary becomes a fruit
4. Which of the following is NOT a factor needed by plants?
a. fire
b. nutrients
Please pasagot po ng tanong ko please
c. sunlight
d. water
5. Which is the reproduction in plants where the male and female parts of the flower are involved?
a. asexual
b. sexual
c. rhizome
d. pollination
Answer:
1 ans: d. all seeds has young plant, stored food and a seed coat.
2 ans: d. the right pollen is placed on their stigmas
3 ans: a. pollen grain falls on a pistil
4 ans: a. fire
5 ans: b. sexual
Hope it helps,
Please mark me as brainliest
Thank you...
Which statement describes asexual reproduction but not sexual
reproduction?
A. Offspring are genetically identical to the parent.
B. The process involves cell division by meiosis.
c. Offspring are genetically different from one another.
D. The process involves two parents.
Plz i’ll give brainless plz pick correct
Answer:
A. Offspring are genetically identical to the parent.
That's the answer. I hope it helps!
The statement which describes asexual reproduction but not sexual
reproduction is A. Offspring are genetically identical to the parent.
What is Asexual Reproduction ?Asexual reproduction is a type of reproduction that does not involve the fusion of gametes or change in the number of chromosomes.
The offspring that arise by asexual reproduction from either unicellular or multicellular organisms inherit the full set of genes of their single parent.
An Asexual reproduction means that the parent organism will simply split into two child organisms, and that there will be no mixing of the DNA, as it is the case in case of the sexual reproduction which mixes up the DNA.
Therefore the child and the parent organism will contain exactly the same genetic material - the correct answer is A.
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Charles Darwin's theory of evolution describes how species evolve due to natural selection. Which of these is NOT evidence of natural selection? A. Carmels have long, bushy eyelashes. B. Mint plant varieties are crossed to express desirable traits. C. The snowshoe here is white in winter and brown in summer. D. Galapagos finches have stronger breaks after years of drought.
Answer:
b
Explanation:
mint plant varieties are crossed to express desirable traits
xam
What do we
call the type of
reflection in
the upper
image?
A. Diffuse reflection
B. Rough reflection
C. Specular reflection
D. Obtuse reflection
Answer:
Specular reflection is correct answer by my views
hope it helps you
14. Triple bonds are the strongest, followed by double bonds and single
bonds are the weakest.
Explain this trend using electric force and Coulomb's Law in your
answer.
Answer:
See explanation
Explanation:
Recall that according to Coulomb's law, energy is inversely proportional to the square of the distance separating the charges. This implies that the smaller the distance of the charges apart, the greater the magnitude of energy.
Similarly, the bond energy of a bond is inversely proportional to the bond length of the bond. The shorter the bond length of the bond, the greater the bond energy.
Triple bonds are shorter than double bonds and double bonds are shorter than single bonds. This implies that triple bonds, having the shortest bonds, also has the highest bond energy and single bonds having the longest bond length, has the lowest bond energy.
If 2.0 moles of magnesium hydroxide are present, how many moles of phosphoric acid, would be required for the reaction?
3Mg(OH)2 + 2H3PO4 Mg3(PO4)2 + 6H2O
Answer:
1.33
Explanation:
What should scientists do if their ideas don’t agree?
Answer:
They should test their answer over again. Same thing with math.
Explanation:
If they are doing an experiment, do the experiment over and reach out to other scientits to validate your results
Please help me fast...
B) 1 and 3
it's the right answer
Answer:
For 3rd question, the answer is option D
10. Which is true of unicellular organisms?
A. They lack cells.
B. They all are eukaryotes.
C. They lack cell differentiation.
Answer:
a
Explanation:
Answer:
The answer is
B. They all are eukaryotes.
Hope it will help :)
What force(s)
might cause a car
to slow down?
Friction
Applying the brakes
Wind
All of the above
itssssssssss scienceeeeeee
Answer:
C.
Explanation:
...........................
Which of the following pairs of elements will form covalent bonds with each other? PLEASE HELP
The pair of elements which will form covalent bonds with each other are Si (Silicon) and N (Nitrogen). Hence the correct option is (B).
What is Covalent Bond ?
A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.
These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Silicon and nitrogen forms strong covalent bond . This stable covalently bonded material does not readily sinter and cannot be heated over 1850⁰C as it dissociates into silicon and nitrogen.
Therefore, The pair of elements which will form covalent bonds with each other are Si (Silicon) and N (Nitrogen). Hence the correct option is (B).
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B. Directions: Identify what stage of human
development is being described. Choose
from the list of words inside the box.
ADULTHOOD
INFANCY
BIRTH
1. A child learns to walk, talk
and begin to be more self-sufficient at
this stage
2. A child is completely
dependent on the care of his parents in this
stage.
3. It is the stage that the boys
begin to experience changes in their
voice.
4. Boys and girls gain more
independence from their parents during
this stage.
5. Girls at this stage begin to
menstruate ad are now capable of
giving birth.
Answer:
Adulthood = 3 and 5
Infancy = 1 and 4
Birth = 2
Explanation:
can someone please explain to me the difference between oxidation and reduction? Please I need help.
Answer:
Oxidation occurs when a reactant loses electrons during the reaction. Reduction occurs when a reactant gains electrons during the reaction.
The amount of space that a gas takes up is its
a.
volume.
b.
mass.
c.
pressure.
d.
density.
Answer:
A. volume............
Answer:
Volume is correct
Explanation:
give the other person brainliest :>
which of the following best explains why the strings of a harp make sounds when it is played?
Copper (II) nitrate, Cu(NO3)2, solution reacts with potassium hydroxide, KOH, to form a blue
precipitate of copper (IT) hydroxide.
Write the balanced chemical equation:
Write the overall ionic equation:
Identify the spectator ions:
Write the net ionic equation:
Answer:
Copper(II) nitrate and potassium hydroxide are soluble ionic compounds, which implies that they dissociate completely when dissolved in water to produce ions. ... You can thus say that the balanced chemical equation that describes this double ... Cu(NO3)2(aq)+2KOH(aq)→Cu(OH)2(s)⏐⏐↓+2KNO3(aq).
