Answer:
Once ignited, a ribbon of magnesium metal burns freely in air to form solid magnesium oxide in the form of a white powder. The reaction is plainly spontaneous even though ΔS is negative.
Explain what is meant by a weak acid
Answer:
A weak acid is an acid which dissociates partially to release few hydrogen protons or ions
Explanation:
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state two application of chemistry on each of the following:-
1.forensic
2.agriculture
3.industrial
4.millitary
5.space science
Which of the following are considered physical properties of a substance?
Color and odor
malleability and hardness
melting and boiling points
all of the above
hi <3
the correct option would be all of the above
hope this helps :)
IF U ANSWER ILL BRAINLIST AND GIVE U 5 STAR PLUS U GET EXTRA POINTS:)) WRITE IT IN UR OWN WORDS PLS OR NO POINTS.
The burning of a magnesium ribbon is an example of a reaction producing a metal oxide.
a) What reactants are required to production of a metal oxide?
b) Write a general equation for the production of a metal oxide.
Answer:
a) When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. A compound is a material in which atoms of different elements are bonded to one another. Oxygen and magnesium combine in a chemical reaction to form this compound. After it burns, it forms a white powder of the magnesium oxide.
b) Metals react with oxygen in the air to produce metal oxides. For example, magnesium reacts with oxygen to produce magnesium oxide when it is heated in air: magnesium + oxygen → magnesium oxide 2Mg + O2 → 2MgO
Explanation:
Hope it helps. if yes, plz mark me as brainliest
As a professor Daniel must complete a research project each year in order to
stay on staff. Daniel is an engineer and has to deal with many complicated
mathematical calculations. Knowing this fact Daniel would most likely concern
himself with qualitative research,
Explanation:
Add our site sources in order to be advantage of knowledge
who knows india??????
Answer:
Me India is located in Asia and its capital name is New Delhi.
Explanation:
[tex]india \\ 1)india \: is \: the \: 7 \: th \: largest \: country \\ 2)home \: to \: old \: civilizations \\ 3)father \: of \: the \: nation \: mahathma \: gandi \\ 4)country \: is \: divided \: in \: to \: 28state \\ 5)1000of \: lnguages \: 100 \: of \: cultures \: \\ so \: india \: is \: very \: much \: attractive \\ very \: much \: special \\ 1947 \: august15 \: indias \: independce \: day \\ thank \: you \: \\ jai \: hind[/tex]
What do the nuclei of 1H hydrogen atoms contain?
protons only
electrons and protons
electrons and neutrons
neutrons only
Answer:
"Protons only"
Explanation:
Hydrogen has one proton in its nucleus. It does have one electron rotating outside of the nucleus, BUT NOT IN THE NUCLEUS. 'A' is the correct answer.
Why are intensive properties useful for identifying a substance
Answer:
Intensive properties can be used to help identify a sample because these characteristics do not depend on the amount of sample, nor do they change according to conditions.
If you were converting from Milli- to Centi- units, how many decimal places would you move?
Answer:
1 decimal place
Explanation:
centi- is 10 times larger than milli- (centi- = 0.01 milli- = 0.001)
1 mili is equal to the 0.01 centi. Since all metric units differ by powers of ten, changing between them just necessitates moving the decimal point to the left or right.
What is difference between millimeter and centimeter ?The actual ratio is 10 millimeters to 1 centimeter. Now, it is clear that centimeters are bigger than millimeters.
There is no change in volume, these measurements are the same. The main distinction is that fluid quantities are measured in milliliters, but solid quantities are measured in cubic centimeters. 1 cc is 1 mL no matter what is being measured.
The units used to measure length are centimeters and millimeters, respectively. 1 cm is equivalent to 10 mm, and 1 millimeter is equal to 0.1 centimeter.
Thus, for converting from Milli- to Centi- units 10 digit place would be move.
To learn more about millimeter and centimeter refer the link below;
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Help anyone can help me do this question,I will mark brainlest.
Explanation:
NA2SO3
Combination of these three elements forms following compounds.
And the compound that's going to be formed,depends on the ratio of available oxygen and sulphur.
Depends on the ratio of sulfur to oxygen...
sodium sulfate, Na2SO4
sodium sulfite, Na2SO3
sodium thiosulfate, Na2S2O3
ionic bond is present in between SO3 -2 and Na+2
structure of SO3 -2 [take - sign as delta - which here indicates,partial formal charge of oxygen] (image below)
Here,The oxygen is more electronegative.So,2 oxygen atoms drag one Electron from sulphur atom,leaving behind the formal charge of -1 on two oxygen atoms.
The third oxygen forms covalent bond by sharing 2 electrons. (Actually this ion has resonance structure)
This sulphite ion combines with two sodium ions to form two ionic bonds.This happens when sodium, being an alkali metal dontes it's valence electron to oxygen.
SO2
In Sulphur dioxide, Sulphur is bonded to 2 oxygen atoms. Oxygen is more electronegative than Sulphur and thus, shows a fixed valency of 2. As a result each oxygen forms two bonds with the Sulphur atom making its valency 4.
NAHSO4
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Questions & Answers
CBSE
Chemistry
Grade 11
Oxidation State or Oxidation Number
Question
Answers
Related Questions
The oxidation state of sulphur in NaHSO4 ?
A) 0
B) + 2
C) −2
D) + 4
E) + 6
Answer
VerifiedVerified
72.9K+ Views
Hint: The oxidation state is defined as the charge on the atom. The sum of the oxidation state of an atom in a molecule is equal to the charge on the molecule. The neutral molecules charge less species. It has zero charges.
Complete Solution :
- The oxidation number of an atom is defined as the charge on an atom that appears on the atom on forming an ionic bond. An atom which has higher electronegativity has a negative oxidation state and more electropositive elements have positive oxidation state.
- We are interested in determining the oxidation state of an atom in a molecule. We know that the net charge on a neutral atom or molecule is always equal to zero. Let’s determine the oxidation state of S in the NaHSO4 .
- The oxidation number of alkali metal that is a sodium atom is equal to +1 . Similarly the hydrogen has an +1 oxidation state. Oxygen is an electronegative element. It has an −2 oxidation state. The oxidation states are as listed below:
Element Oxidation state
Na +1
H +1
O −2
We know that the sum of the oxidation state of an atom in a neutral molecule is equal to zero. Then we have,
0 = O.S. of Na + O.S. of H + O.S. of S + 4(O.S. of O)
Let’s substitute the values of oxidation state .we have,
0 = 1 + 1 + O.S. of S + 4(−2)⇒O.S. of S= 8−2 = +6
Therefore the oxidation state of sulphur in NaHSO4 is equal to +6 . So, the correct answer is “Option E”.
H2S
Valency of sulphur is 2 in H2S
as the amount of water decreases in a glass of water you are drinking the desitny of water also decreases true or false
Answer:
False: the density does not change. if the water became more dense, it would move onto the next state of matter, which is ice. the only thing that changes by adding more water is weight
Answer:
False
Explanation:
This is because as the volume decreases the density increases
Why is it impossible for an element to have an atomic number of 110.5? (1 point)
A_ Exactly half of the isotopes would need an atomic number of 110, and half would need an atomic number of 111, which is very unlikely.
B_ Atoms of an element all have the same whole number of protons and neutrons.
C_ Atoms with atomic numbers greater than 100 are unstable.
D_ Atoms of an element all have the same whole number of protons.
Answer:
C
Explanation:
I asked my teacher
The number of protons in an atom are always whole numbers hence it is impossible for an element to have an atomic number of 110.5. The correct answer is option D: Atoms of an element all have the same whole number of protons.
We define the atomic number as the number of protons in an atom. The number of protons in all the atoms of en element must be a whole number.
There is no half proton in the atom hence we can not have an atomic number of 110.5.
Learn more: https://brainly.com/question/8834373
what happens to concrete after heating it
Circle the two terms in each group that are related. Explain how the terms are related.
16. Celsius degree, mass, Kelvin
17. balance, second, mass
18. kilogram, liter, cubic centimeter
19. time, second, distance
20. decimeter, kilometer, Kelvin
Answer:
16) Celsius degree and Kelvin are related since they are measuring unit of temperature.
(17) Balance and Mass are related since mass can be measured with balance.
18) Liter and cubic centimeters are related since they are used to measure capacity or volume of liquid.
19) time and second are related since time is measured in second
20) decimeter and kilometer are related since they are measuring unit of distance or displacement.
Explanation:
The two terms in each group that are related are Celsius and Kelvin, balance and mass, liter and cubic centimeter, time and second, and decimeters and kilometers.
What are Celsius and Kelvin?Celsius and Kelvin are the units and they are related to each other because both of them can be used to determine or to define the temperature of the environment for anything which is needed to be measured.
The balance and mass are related to the balancing of mass and kilogram with centimeter cubic are related for density and time and second is related to each other last decimeters and kilometers unit of lengths.
Therefore, two terms in each group that are related are Celsius and Kelvin, balance and mass, liter and cubic centimeter, time and second, and decimeters and kilometers.
Learn more about Celsius and Kelvin, here:
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A student is investigating potential and kinetic energy by stretching a spring across a table
At which step is the potential energy in the spring the greatest
Answer: when it’s fully stretched across the table
Explanation: because when it’s stretched it has the most potential kinetic energy
grass → rabbit → fox
Explain why energy is lost by the rabbits in the middle step of this food chain.
Answer:
The rabbit losses energy by great and waste
Explanation:
The grass loses energy by respiration and a rabbit from eating other living organisms but when the fox eats the rabbit no if not little energy is passed to the fox
Plant and Animal Cells
С
B
F
1 20 points
Which letter represents the brain of the cell?
о B
H
H
Why
E
D
G
Answer:
Nucleus is known as the brain of the cell.
correct option is B letter
Define uniform and non-uniform motion.
Answer:
When a body covers equal distances in a straight line, equal intervals of time are called uniform motion
When a body covers unequal distance in equal intervals of time in a straight line is called non-uniform
Answer:
Uniform motion- is motion in which the
velocity does not change.
Non-uniform motion-occurs when the velocity of an object is not
constant : the object speeds up or slows down during its motion, or changes direction.
Hope it will help you !!
what are fossil fuels?
A fossil fuel is a natural substance formed from the buried remains of ancient organisms that can be used as a source of energy. Fossil fuels formed over millions of years as heat and pressure from layers of sediment changed the decayed organic remains into materials such as coal and petroleum.
How are they made?Fossils fuels are usually made of fossilized plant and animal remains from millions of years ago. The creation of fossil fuels—either oil, natural gas, or coal—from these fossils is determined by the type of fossil, the amount of heat, and the amount of pressure which they bore.
Hope it helps....
(by Benjemin)
why does the s orbital fill before the p orbital
Answer:
The s orbital is lower in energy than the p orbital
Explanation:
S-orbital electrons are simultaneously closer to the nucleus (more stable) and farther from the nucleus (less stable) compared to the corresponding p-orbitals. This makes them favorable to occupy when no p-electrons are present, but less favorable to occupy when p-electrons are present, which is why they are filled first but ionize first.
If you burn a citronella candle near your picnic will it keep mosquitoes away
Answer:
Thanks!!!
Explanation:
Answer:
true
Explanation:
Most Ancient Greek philosophers discusses the world around them but did not do any experiments or make detailed observations
Answer:
Because to them it was just a little bit of fiction. so they don't really think it's necessary to do experiments or make detailed observation
Explanation:
it's just like how we presently today discuss about robot talking to us like humans but it's not yet come to pass .
Fractions of crude oil
Answer:
Fractions. There are several ways of classifying the useful fractions that are distilled from crude oil. One general way is by dividing into three categories: light, middle, and heavy fractions. Heavier components condense at higher temperatures and are removed at the bottom of the column.
Answer:
Fraction: No. of carbon atoms: Boiling point range oC:
Gasoline (petrol) 4 - 12 32-160oC
Kerosine (paraffin) 11 - 15 160-250oC
Diesel oil 15 - 19 220-350oC
Residue lubricating oil heavy fuel oil bitumen C Above 350oC
Explanation:
Fractions. There are several ways of classifying the useful fractions that are distilled from crude oil. One general way is by dividing into three categories: light, middle, and heavy fractions. Heavier components condense at higher temperatures and are removed at the bottom of the column
Define measurement. why is it important in our life?
Answer:
Measurements are so often taken for granted we sometimes do not appreciate the grand importance measurements play in our lives. On a baseline level, measurements fall into the categories of weight, area, volume, length and even temperature. While we look at these various categories as stoic forms of mathematical measurements a closer examination of things we do in everyday life reveals their clear importance.
Explanation:
Measurements provide structure and remove the chaos that would result without any congruent method of understanding weight, mass, temperature, etc.
Answer:
The comparison of unknown physical quantity with the known standard quantity of the same kind is called measurement.
Measurements play an important role in daily life because they are useful to do basic tasks, such as take a child's temperature with a thermometer, make time estimations, measure out medicine and find weights, areas and volumes of different materials or substances.
Hope it helps you.This is an image of ice
cubes made of water. Is
water (or ice) a mixture or a
compound made up of
molecules?
А.
a mixture
В.
a compound made up of molecules
Answer:
it is a compound made up of molecules
ons below.
Which diagram shows the correct electron
configuration for fluorine (F)?
Option A is correct way of representation of electronic configuration.
Marta wants to explain how pollution is affecting the biodiversity of a local lake. Which of the following models are most appropriate options to use in her explanation? I. Graph II. 3-D model III. Simulation
Answer:
Graph models are most appropriate options to explain how pollution is affecting the biodiversity of a local lake.
Explanation:
Marta wants to explain how pollution is affecting the biodiversity of a local lake
For explanation
we have to use the graph because graph only shows the gradual level of of pollution that affect the biodiversity of a lake and water resources.
3D model and simulation is also effective but graph model is is more effective than other
To learn more about pollution refer:
https://brainly.com/question/20782855https://brainly.com/question/12191761stute 2 lomportance of weather fore castings
Answer:
Climatology and Weather Forecasting is important since it helps determine future climate expectations.Forecasts based on temperature and precipitation are important to agriculture, and therefore to traders within commodity markets. Temperature forecasts are used by utility companies to estimate demand over coming days.Explanation:
Climatology and Weather Forecasting is important since it helps determine future climate expectations. Through the use of latitude, one can determine the likelihood of snow and hail reaching the surface. You can also be able to identify the thermal energy from the sun that is accessible to a region.
What is the structure of a fluorine atom?
Answer:
The nucleus consists of 9 protons and 10 neutrons. Nine electrons occupy available electron shells.
name four states of matter
Answer:
1. solid
2. liquid
3. gas
4. plasma
Explanation:
In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.