Answer:
1. Mg+Hcl--》Mgcl2 + H2
what is 89,700,000,000 in scientific notation
Answer:
89.7 billion in scientific notation = 8.97 × 1010.
Explanation:
What's the iupac name?
Answer:
In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a method of organic chemical compounds
Explanation:
IUPAC
Answer:
uip name : propane-1,2,3-triol
13)
Which emission causes the atomic number of a nuclide to decrease by 2 and its mass
number to decrease by 4?
Answer:
Alpha decay.
Explanation:
When an element undergoes alpha decay, the resulting daughter nuclei will have a decrease of 4 in the mass number and a decrease of 2 in the atomic number.
In the attached photo, 235 92U undergo alpha decay to produce 231 90Th.
Comparing the mass number and atomic number of 235 92U with that of 231 90Th we can see that the mass of 231 90Th reduced by 4 and the atomic number reduce by 2 indicating that the parent nucleus is undergoing alpha decay.
Answer:
Alpha emission
Explanation:
The alpha particle is akin to a helium nucleus hence it is often referred to as a helium nucleus. The alpha particle has four mass units and a charge if +2.
Alpha emission is one of the emissions undergone by radioactive nuclei. When an atom undergoes alpha emission, it is easy to notice because the mass number of the nucleus decreases by four while its atomic number decreases by two. The daughter nucleus is now found two places behind its parent in the periodic table.
An example of alpha emission is shown below;
23592U→42He+23190Th
Thorium is four mass units less than U-235 and two places behind uranium in the periodic table as explained above.
Which part of the atom makes it unique?
Answer:
nucleus
Explanation:
Which of the following cannot be tested by science?
A) How adrenaline affects the mating behaviors of animals
B)How emotion affects the quality of a painting
C)How gravity affects the movement of an object
D)How temperature affects the sex of offspring
I'm pretty sure it's A)
1
When barium chloride is allowed to react with silver nitrate to give barium nitrate and silver chloride, what are the coefficients for the balanced equation?
___BaCl2 (aq) + ___AgNO3 (aq) → ___AgCl (s) + ___Ba(NO3)2 (aq)
a)1, 2, 2, 1
b)1, 1, 1, 1
c)1, 2, 3, 1
d)1, 1, 1, 2
Answer:
Hello
The first one is correct.
Good luck
Explanation:
How many people thought a blueberry was nicer fruit than a banana
blueberry > banana anyday
Balance the following chemical equations.
a) Ba Cl2 + H2SO4 BaSO4 + HCl.
b) Calcium hydroxide + Carbon dioxide Calcium carbonate + Water.
c) Aluminum + Copper chloride Copper + Aluminum chloride
d) Sulphur dioxide + Oxygen Sulphur trioxide
e) NH3+ CuO Cu + N2 + H2O
Answer:
See the explanation
Explanation:
In this question we have to take into account that we have to get the same amount of atoms on both sides, so:
Reaction 1
[tex]BaCl_2~+~H_2SO_4~=>~BaSO_4~+~2HCl[/tex]
We have 1 Ba, 2 Cl, 2 H and 4 O on both sides
Reaction 2
[tex]Ca(OH)_2~+~CO_2~=>~CaCO_3~+~H_2O[/tex]
We have 1 Ca, 2O, 2 H and 1 C on both sides
Reaction 3
[tex]2Al~+~3CuCl_2~=>~2 AlCl_3~+~3Cu[/tex]
We have 2 Al, 3 Cu, and 3 Cl on both sides
Reaction 4
[tex]2SO_2~+~O_2~=>~2SO_3[/tex]
We have 2 A and 6O on both sides
Reaction 5
[tex]2NH_3~+~3CuO~=>~3Cu~+~N_2~+~3H_2O[/tex]
We have 2 N, 3 H, 3 Cu and 3O on both sides.
I hope it helps
Try to balance the following equation:
Mg(OH)2 + KCL --> KOH
+
MgCl2
Answer:
Mg(OH)2 + 2KCL > 2 KOH +MgCl2
if you remove all the particles from a wooden table, what remains
Need Help ASAP: What is electrostatic attraction?
A. Electrical charge generated when two ionic compounds are placed near each other.
B. Attraction that occurs in ionic compounds when exposed to an electrical current.
C. None of these
D. The attraction between positive and negative ions in an ionic bond.
Answer:
ANSWER D IS CORRECT .(the attraction between positive and negative ions in an ionic bold.
Explanation:
The attraction between positive and negative ions in an ionic bond. Hence, option D is correct.
What is the electrostatic attraction?The electrostatic force is an attractive and repulsive force between particles caused due to their electric charges.
Ionic bonding is the attraction between positively- and negatively-charged ions. These oppositely charged ions attract each other to form ionic networks (or lattices). Electrostatics explains why this happens: opposite charges attract and as charges repel.
Hence, option D is correct.
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which molecule below contains an ionic bond?
a) N2
b) CI2
c) SO2
d) KCI
at show clearly how bonding occured in (cao)
Calcium
oxide
Answer:
They both combine with The help of valency, which is the combining capacity of elements
Explanation:
I find it easier to understand valency as part of the Bhor’s model of an atom.
In his model, it was stated that electrons are spread around the nucleus in such a way that there are rings around the model. Each ring has a n value. So, k has 1, l has 2, m has 3 and n has 4...
what you need to know to find the number of electrons in each ring is to solve the formula 2n squared
Then, the valency is the 8 minus the number of electrons in the outermost shell. Remember that 8 is max number I;outer most shell. If you try it out for oxygen, you will get the value of 2 remaining, which can be gained if combined with calcium.
Hope it helps
1. Which of the following is not among the first twenty elements? A. Chlorine B. Beryllium C. Iron D. Calcium 2. The number of atoms in one mole of an element is referred to as A. molecularity B. chemical symbol C. atomicity D. chemical element 3. What is the chemical symbol of Aluminum? A. AL B. Al C. aL D. al. 4. Which of the following is a heterogeneous mixture? A. Soft drink B. Air C. Flood C. Solution salt 5. Which of the following is false about mixtures? A. They can easily be separated by Chemical method B. They are not represented by chemical formula C. They can be homogenous or heterogeneous D. The constituents are physically combined 6. Which of the following elements is diatomic? A. Sodium B. Potassium C. Helium D. Oxygen 7. A diatomic element has ___________ number of atoms in one molecule of its element. A. one. B. two. C. three. D. four. 8. Which of the following is an example of a colloidal solution? A. Chalk in water B. Sand in water C. Sugar solution D. Solution of eggwhite 9. A mixture whose constituents are uniformly mixed is referred to as a A. homogeneous mixture B. suspension C. heterogeneous mixture D. colloidal solution 10. _____________ is a force that opposes motion when two surfaces are in contact with each other. A. Movement B. Pressure C. Friction D. gravity 11. _____________ is a substance, which cannot be split or broken down into any simpler form by an ordinary chemical process. A. Mixture B. Element C. Compound D. Metals. 12. Alloys are best classified as A. elements B. compounds C. mixtures D. non-metals 13. A type of force which occurs when a body moves constantly over another body is the _______ A. static force B. dynamic force C. magnetic force D. frictional force. 14. Which of the following is NOT a characteristic of friction? A. The ratio of the frictional force and the normal reaction is constant. B. The frictional force is always equal to the force applied through weight. C. Static frictional force is independent of the surface area in contact. D. Friction supports motion. 15. Use of ball or roller bearing on a turning wheel of a machine A. can cause wear and tear of the wheel B. reduces friction between the wheel and the body parts of the machine C. decreases the efficiency of the machine. D. hinders the productivity of the machine. 16. Another way of reducing friction is by A. painting B. alloying C. oiling D. braising 17. A block of wood weighs 4N lies on a horizontal table. Calculate the frictional force between the table and the wood if the coefficient of the static friction is 0.5. A. 1.0N B. 0.2N C. 2.0N D. 0.4N 18. A body of mass 2kg was moved uniformly by a force of 15N, if acceleration due to gravity is 15m/s, determine the coefficient of dynamic friction. A. 0.75 B. 1.5 C. 0.5 D. 1.75 19. The symbol for Beryllium is A. B. B. Be C. Bl D. Bm 20. K is the symbol of A. Calcium B. Chromium C. Potassium D. Krypton
Answer:
c. iron
Explanation:
iron's atomic number is 26
16. Sulphuric acid + Sodium hydroxide is equal to Sodium sulfate + water.
a. Acid + metal
b. Acid + alkalic.
c. Acid + carbonated.
d. None of the above
Which is correct?
Answer:
The answer is B.
Explanation:
In the reaction above, Sulphuric acid is an acid and Sodium hydroxide is an alkaline. It will produce salt and water in the product side.
How many mole are in 2.84*10^22 molecules of h2
Avogadro's Number and the Mole. The mole is represented by Avogadro's number, which is 6.022×1023 atoms or molecules per mol.
To separate a mixture of hard candies and
marbles, the most efficient method would be
Answer:
depends on the size andt shape i think hand picking would be most efficient.
Explanation:
The most efficient method to separate a mixture of hard candies and marbles would be to use a physical property that is unique to one of the components of the mixture.
In this case, the physical property that can be exploited is the difference in size and shape between the hard candies and the marbles. Since marbles are solid spherical objects and hard candies are irregularly shaped, it is possible to employ a sieving or filtration method to separate them.
A sieve or a mesh with openings smaller than the marbles but larger than the hard candies can be used. By pouring the mixture onto the sieve and shaking it gently, the marbles will be retained on the sieve while the smaller-sized hard candies will pass through the openings and be collected separately.
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WHAT IS THIS SYMBOL AND HOW DO I FIND THIS?
I asked so many of my friends what this is but I don't know! I know that Ea is activation energy, but this is different.
I attached the graph and the question with the odd symbol.
I will mark Brainliest!
The center of the atom is known as the?
Answer:
nucleus
Explanation:
An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons. The protons and the neutrons make up the center of the atom called the nucleus and the electrons fly around above the nucleus in a small cloud.
hope that helps!
How many elements are present in each of the following HF and. Hf ii) Co and CO iii) Si and SiO2 iv) PoCl2 and POCC3
Answer:
HF and Hf consist of 3 elements: Hydrogen (H), Flourine (F) and Hafnium (Hf).Co and CO consist of 3 elements: Cobalt (CO), Carbon (C) and Oxygen (O).Si and SiO2 consist of 2 elements: Silicon (Si) and Oxygen (O). {unless you mean SI where "I" would be iodine)PoCl2 and POCC3 have 5 elements: Polonium (Po), Chlorine (Cl), Phosphorus (P), Oxygen (O) and Carbon (C).How many ml of 0.5M of HNO3 would be needed to react with 85ml of 0.75M of KOH
Answer: 127.5ml
Explanation:
To calculate the volume of acid, we use the equation given by neutralization reaction:
[tex]n_1M_1V_1=n_2M_2V_2[/tex]
where,
[tex]n_1,M_1\text{ and }V_1[/tex] are the n-factor, molarity and volume of acid which is [tex]HNO_3[/tex]
[tex]n_2,M_2\text{ and }V_2[/tex] are the n-factor, molarity and volume of base which is KOH.
We are given:
[tex]n_1=1\\M_1=0.5M\\V_1=?mL\\n_2=1\\M_2=0.75M\\V_2=85mL[/tex]
Putting values in above equation, we get:
[tex]1\times 0.5\times V_1=1\times 0.75\times 85\\\\V_1=127.5mL[/tex]
Thus 127.5 ml of 0.5M of HNO3 would be needed to react with 85ml of 0.75M of KOH
How do erosion and deposition work together to form sand dunes?
Waves cause erosion along coastlines and deposit sand away from the shore.
Erosion occurs as surface water carries sediment and the sediment is deposited near oceans and lakes.
Glaciers cause erosion through the movement of large chunks of ice, which are deposited and form depressions.
Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.
Answer:
Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.
Explanation:
Erosion can be defined as a geological process which involves the wearing away of earth material and transportation of these material to another location by Natural agents such as wind and water. Erosion involves removal of top soil, rocks and other earth particles by action of wind, glacier and water.
Wind causes erosion by deflation. Deflation is the actual removal of grain of rocks . Generally, it s the lowering of land surface that happens as a result of removal of surface particles(sands grains) by wind. Deflation is usually prevalent in arid areas. This sand can later be picked up and deposited to form sand dunes . Sand dunes are mounds of sand formed by wind . This sands are sheltered by an obstacle. And sand dunes are prevalent in desert and or along the beach. The sand dune grows as sand accumulate.
The way in which erosion and deposition work together to form sand dunes is: Erosion occurs through deflation, and sand that was picked up is deposited against an obstruction.
Exogenic processes refer to the various processes that occur at or near the surface of planet Earth due to the action (influence) of exogenic forces or geomorphic agents.
In Geology, the five (5) evidence of exogenic processes on Earth's surface include the following:
WeatheringStrippingMass wastingErosionDepositionDeposition is typically a consequence of erosion and it usually result in the laying down of sediment on a landform (landmass), which sometimes make the foundation of buildings stronger to withstand stress.
The formation of sand dunes is generally caused as a result of the effect of both erosion and deposition. Sand dunes are formed when sands are eroded from rocks through deflation, which leads to an accumulation of more sand.
Furthermore, the accumulated sands are picked up by strong winds and then deposited in another location against an obstruction.
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Ted likes to run long distances. He can run 20 km 20 km20, start text, space, k, m, end text in 95 9595 minutes. He wants to know how many kilometers ( k ) (k)left parenthesis, k, right parenthesis he will go if he runs at the same pace for 285 285285 minutes. How far will Ted run in 285 285285 minutes?
Answer:
The distance in kilometer that Ted will go if he runs at the same pace for 285 minutes is 60km
Step-by-step explanation:
It was given that Ted Ted runs 20 km in 95 minutes, so for us to know how many kilometers he runs at the same pace for 285 minutes by using proportion.
For Ted to run 20 km in 95 minutes.
[tex]Speed=Distance/Time[/tex]
where given distance= 20km
Given time =95minutes
Speed=20/95 .............eqn(1)
To calculate the distance in kilometers Ted will go if he runs at the same pace for 285 minutes, then
Speed= K/225 ...............eqn(2)
Let us represent distance with 'K'
Given time 225minutes
Equating eqn(1) and eqn(2)
Hence the proportion model that Ted could use in modelling this situation is this;
[tex]20/95=K/225[/tex]
Cross multiply
K×95=20×225
[tex]K=60[/tex]
The distance in kilometer that Ted will go if
he runs at the same pace for 285 minutes is 60km
Will there be a precipitate for the following reaction? Aqueous zinc chloride + aqueous sodium carbonate A. No B. Yes, there will be one precipitate. C. Yes, there will be two precipitates. D. Yes, there will be three precipitates.
Answer:
Option B. Yes, there will be one precipitate.
Explanation:
We'll begin by writing the balanced equation for the reaction between aqueous zinc chloride and aqueous sodium carbonate. This is given below:
ZnCl2(aq) + Na2CO3(aq) —> ZnCO3(s) + 2NaCl(aq)
From the equation above, we can see that one precipitate is form i.e zinc carbonate, ZnCO3 as it is insoluble in water.
Therefore, the reaction produces one precipitate.
Select the correct answer
Which statement is true of a chemical change?
0 A
OB
It involves changes in the molecular structure.
It involves changes in phase but not changes in the molecular structure.
It involves dissolving one substance into another.
OC.
D.
It involves a change in the state, or phase of a substance.
О Е.
It involves the process of separating two or more dissolved substances.
Answer:
i think its B but im not so sure
explain why the freezing of water into ice causes the cracks to widen
Answer:
The freezing of water into ice causes the cracks to widen because it occupy more space.
Explanation:
When the water change its state of liquid to solid state due to decrease in temperature, it contracts means occupy less space but when the temperature reaches to 4 degree Celsius, it starts to expand. When the temperature goes below 0 degree Celsius, it will cause more expansion and occupy more space that causes the cracks to widen.
how does water affect the growth of a plant?
10 grams of sodium hydroxide, NaOH, is dissolved in 0.25 liters of solution. Determine the molarity (M).
Answer:
1M
Explanation:
The molarity of a substance is defined as the number of moles of the substance divided by how many liters the solution is. NaOH has a molar mass of about 40 grams, meaning that 10 grams of it would be 0.25 moles. 0.25/0.25= a molarity of 1.
Hope this helps!
what can you add to a voltaic cell to make it into an electrolytic cell?
Answer:
a cell or battery
Explanation:
this is because a voltaic cell is such a cell where chemical energy gets converted to electrical energy. the energy conversion in the case of an electrolytic cell is from electric to chemical (battery supplies electrons to the anode respectively). So, I feel by adding a cell or battery, we can change the way energy conversion takes place, thereby changing the process.
based on the data table, which unknown solution could be 0.1 m naoh
Answer:
Where is the data table?