What happens when water is added to quicklime? Write two observations.

Answers

Answer 1

Answer:

1.Most metal oxides are insoluble in water but some of these (e.g. Na2O.

Explanation:

2.: (i) A hissing sound is observed.

1.ii) The mixture starts boiling and lime water is obtained.


Related Questions

Which contains more carbon 4.71 g of C6H12O6 or 5.85 g C2H6O?

Answers

Answer:

5.85 g C2H6O has more carbon

Explanation:

Weight of carbon in  4.71 g of C6H12O6

[tex]4.71 * 12.01\\56.5671\\[/tex] grams

Weight of carbon in  5.85 g of C2H6O

[tex]5.85 * 12.01\\70.259\\[/tex] grams

Hence, 5.85 g C2H6O has more carbon

The extraction of zinc from zinc blend and explain how the zinc oxide be reduced using Carbon monoxide Electrolysis

Answers

Answer:

Zinc blend is Zinc sulphide, ZnS.

ZnS is roasted in air producing ZnO and Sulphur dioxide.

ZnO is reduced to Zn by CO.

Further purification is done by electrolysis.


I need help on this asp

Answers

Answer:

copper or steel

Explanation:

hope this helps

Answer: Plastic.
Explanation:

What must happen to break a chemical bond?

Energy must be released.

Electrons must be provided.

Energy must be provided.

Answers

Answer:

Energy must be provided

Explanation:

Chemical bonds are initially stable, energy is required to break them apart.

What is the molarity of a solution prepared by dissolving 35.0 grams of NaOH in enough water to make a solution with a total volume of 2.40 liters?

Answers

first u convert moles to grams (ps u can use a calculator online for that!) then take the mol and times that by the liters(volume) i got 0.364 M NaOH

pls ans quicckk two q

Answers

Answer:

there is nothing here

Explanation:

ЗKOH + H3PO4=K3PO4 + 3H2O
what is the reaction

Answers

Answer: The given reaction is a neutralization reaction.

Explanation:

When an acid chemically reacts with a base then it leads to the formation of salt and water.

For example, [tex]3KOH + H_{3}PO_{4} \rightarrow K_{3}PO_{4} + 3H_{2}O[/tex]

Here, KOH is a the base and [tex]H_{3}PO_{4}[/tex] is an acid which on chemical reaction with each other leads to the formation of salt [tex](K_{3}PO_{4})[/tex] and water [tex](H_{2}O)[/tex].

Thus, we can conclude that the given reaction is a neutralization reaction.

This is science

Can photosynthesis still take place if plants do not receive enough water from the water cycle? Why or why not?

Answers

Answer:

No.

Explanation:

Photosynthesis is the light dependent process which must occur for the plant to live. This process also requires water and carbon dioxide. If photosynthesis does not occur, the plant will die.

If plants do not receive enough water from the water cycle, photosynthesis can be affected, and in severe cases, it may not take place at all.

Why photosynthesis requires water?

Photosynthesis requires water as one of its essential inputs, as it is used in the process of creating glucose and oxygen from carbon dioxide and light energy. Therefore, if plants do not receive enough water from the water cycle, photosynthesis can be impacted, and in severe cases, it may not take place at all.

Water is not only a raw material in photosynthesis, but it is also necessary for the regulation of plant cells' internal pressure, which is essential for maintaining their shape and structure. Without enough water, the cells' internal pressure decreases, causing them to shrink and lose their rigidity. This process is known as wilting.

Hence, water is essential for plant growth and photosynthesis, and if plants do not receive enough water from the water cycle, it can lead to wilting, stunted growth, and a reduction in photosynthesis.

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What makes up all of the populations in an area

Answers

Answer:

The number of people in that specific area.

Explanation:

A graph of gas pressure versus the number of particles in a container is a straight line. Which other relationship will have a similar graph? volume versus pressure, because they are also directly proportional volume versus temperature, because they are also directly proportional volume versus pressure, because they are also inversely proportional volume versus temperature, because they are also inversely proportional

Answers

Answer:

b

Explanation:

gitcy is good for your spleen

The other relationship that will have a similar graph is volume versus temperature, because they are also directly proportional according to Charles's Law.

What is Charles's Law?

Charles's Law is a gas law that states that the volume of a fixed mass of gas at a constant pressure is directly proportional to its absolute temperature.

This means that as the temperature of a gas increases, the volume of the gas will also increase proportionally, and as the temperature of a gas decreases, the volume of the gas will decrease proportionally.

Therefore, if a graph of gas pressure versus the number of particles in a container is a straight line, a graph of volume versus temperature will have a similar shape and be directly proportional, because they are both affected by changes in temperature.

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Which of the following does not describe a solid

Answers

Answer:

water is not a solid and a rock is a solid

This is Science

How does the process of photosynthesis help the overall life on earth? (Hint: what does it produce that living things need to live?)

Answers

Answer: Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.

Explanation:

Cuántos gramos de cloruro de magnesio se pueden obtener si se hacen reaccionar 354,9g de cloruro de titanio (IV) y 285g de magnesio puro, Recuerde que como productos obtiene titanio y cloruro de magnesio.

a. escriba la ecuación balanceada

b. determine el reactivo limite

c. La cantidad de reactivo en exceso

Answers

Answer:

sorry I dont speak Spanish

Identify the type of reactions based on the reactants. Then, predict the products for the following reactions. Make sure to balance the reactions.

a. C3H8 + O2 →

b. HBr + KOH →

c. KCl + AlBr3 →

Answers

Answer:

a) C3H8 + 502 ----> 3CO2 + 4H20.

combustion reaction

b) HBr + KOH ----> KBr + H2O

Neutralization reaction

c)AlBr3 + 3 KCl----> 3 KBr + AlCl3

Redox reaction

Help! Please and thank you

Answers

Answer:

0.20 M

Explanation:

Molarity is the concentration of a solute (MgCl2) in our solution (water). Molarity tells us how many moles of a substance is per Liter. So to figure out Molarity we'll break it down to this formula: Molarity = [tex]\frac{moles}{Liter}[/tex].

We can get moles by converting it from grams -> moles by using the molar mass, which is measured in grams/mol, that is our stepping stone to moles.

The molar mass is the sum of all the substances in the compound, so you'll need to refer to the periodic table.

Molar mass: (24g Mg) + ( 2 x 35g Cl)= 94g

Moles of MgCl2: 45.7g MgCl2 x [tex]\frac{1 mol}{94g MgCl2}[/tex] = 0.49 mol MgCl2

1 kg of water = 1 L so we don't have to convert anything, we can just use 2.40 L.

Molarity of MgCl2: [tex]\frac{0.49 mol MgCl2}{2.40 L}[/tex] = 0.20M

Justify the
the importance of solar enengy as on
alternative source of energy in Nepal​

Answers

Answer:

Nepal aims to achieve universal access to clean, reliable and affordable renewable energy solutions by 2030. It is expected to reduce dependence on traditional and imported energy by increasing access to renewable energy. The use of solar energy is more reliable than traditional electricity in Nepal.

According to law of conservation of energy,solar energy is a renewable source of energy as it's heat can be converted to other forms of energy  and can be conserved and is being looked as an alternative in Nepal.

What is law of conservation of energy?

According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Julius Robert Mayer in the year 1842.

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What three temperature measurements Inust you make to calculate the specific heat of a sample using a calorimeter?​

Answers

Answer:

Explanation:

Heat and temperature are two different but closely related concepts. Note that they have different units: temperature typically has units of degrees Celsius ( ∘ C ^\circ\text C ∘Cdegrees, start text, C, end text) or Kelvin ( Kstart text, K, end text), and heat has units of energy, Joules ( Jstart text, J, end text).

if an element forms 1- ion, in which group of the periodic table would you expect to find it

Answers

Many of the elements on the periodic table will always form ions that have the same charge. The alkali metals (shown in yellow) always form +1 ions. The alkaline earth metals (red) always form +2 ions. The halogens (blue) always form -1 ions.

Answer:

the correct answer is 17


Which statement best describes the most likely temperatures of Portland, Oregon, and Eugene, Oregon, on this day in January?
А
Eugene was a little colder than Portland because Eugene is a little closer to the coast.
B
Portland was a little colder than Eugene because Portland is a little farther to the north.
С
Portland was much colder than Eugene because Portland was north of the polar jet stream.
a
D
Eugene was much colder than Portland because Eugene was south of the polar jet stream.

Answers

Answer: Hello, There your Answer is Below.

A. Eugene was a little colder than Portland because Eugene is a little closer to the coast.

Explanation:

Hope this Helps you!!

Have a great day!!!

which substance has more particles 1 mole of gold or 1 mole of water explain your answer .

Answers

Answer:

Neither of them have more particles than the other.

Explanation:

Neither of them have more particles than the other because;

1 mole of any substance usually contains 6.022 × 10^(23) atoms/molecules/particles of that very same substance.

Thus, it will be the same value for Gold (Au) and water(H2O).

What is the common uses for Manganese??

Answers

I need help with this one too , can you guys please help us !!

What should be the labels on the X-axis and Y-axis?​

Answers

Answer:

The label on the X-axis is Heat Supplied or Absorbed

The label on the Y-axis is Temperature

Explanation:

The given graph is the heating curve of a substance as it is absorbs heat (increase in the x-axis) and have an increase in temperature (increase in the y-axis) between its different phases, from A to E

Therefore;

The label on the X-axis should be Heat Supplied or Absorbed

The label on the Y-axis should be Temperature

An appropriate state of phase 'A' is the solid phase of the substance where the temperature of the substance increases as heat is supplied without the substance changing into a liquid

Stage 'B' is the melting stage, when the substance transforms from solid to liquid as heat is applied, without an increase in temperature, which is seen by the horizontal line of stage 'B'

At stage 'C', the substance which is entirely liquid continues to absorb heat (moving to the right), while the temperature rises

At stage 'D', the substance in the liquid state continues to absorb heat (moving to the right), but rather than increase in its temperature, the substance transforms to the gaseous phase, which is phase 'E'

At phase 'E', the substance continue to absorb heat without changing state and therefore its temperature increases

The phases 'B', and 'D', where there is no increase in temperature as heat is added (progression to the right) are the regions where we have the latent heat of fusion and evaporation respectively.

How many dm3 of hydrogen are released when 3 g of potassium is reacted with hydroiodic acid?

Answers

Answer:

V = 0.0859dm³

Explanation:

Hydroiodic acid, HI, reacts with potassium, K, to produce potassium iodide, KI, and hydrogen, as follows:

2HI + 2K → 2KI + H₂(g)

To solve this question we have to find the moles of hydrogen produced knowing that 2 moles of K produce 1 mole of H₂. With the moles of hydrogen we can find the volume of hydrogen assuming there are STP conditions:

Moles K -Molar mass: 39.0983g/mol-

3g * (1mol / 39.0983g) = 0.0767 moles of K

Moles H₂:

0.0767 moles of K * (1mol H₂ / 2mol K) = 0.03836 moles H₂

Using: PV = nRT; V = nRT / P

Where V is volume in dm³,

n are moles of gas: 0.03836 moles,

R is gas constant = 0.082atm*dm³/molK

T is absolute temperature = 273.15K at STP

and P is pressure = 1atm

The volume of the gas is:

V = 0.03836mol*0.082atm*dm³/molK*273.15K / 1atm

V = 0.0859dm³

What is the velocity of a wave with a wavelength of 0.03 m and a frequency of
120 Hz?
A. 0.28 m/s
B. 4000 m/s
C. 3.6 m/s
D. 2.5x 10-4 m/s

Answers

Answer:

A

Explanation:

Got a calculation of 8.05297

Answer:

C. 3.6 m/s

Explanation:

I just took a test on a-pe-x and it was correct! :)

Lichens, a combination of fungi and algae, grow on the surface of rocks. They secrete acids that slowly eat away at the surface of the rock.

Is this an example of chemical or physical weathering?


physical


chemical

Answers

Answer:

Chemical

Explanation:

it is a chemical weathering because it is eating away at the rock instead of actively eroding the rock.

As molecules increase in electrons, what happens to their melting and boiling points?

Answers

In general, ionic compounds have the highest melting and boiling points. Polar covalent compounds have lower melting and boiling points than ionic compounds but higher melting and boiling points than nonpolar compounds.

please help me with questions 3, 4 & 5:)

Answers

Answer:

3 C

4 B

5 A

,...............?.

Calcium reacts with oxygen to form calcium oxide. Name the
reactants.

Answers

CaO
Calcium reacts with oxygen to form calcium oxide. The chemical equation for this reaction is Ca + O2 → CaO.

How many oxygen atoms are in 75 g of so3

Answers

Explanation:

nso3=75/80 (80=Mr of so3)

n of o= 75x3/80

x of o= 75x3/80x6.02x10 powered by 23

then, the anwer is

[tex] {10}^{23} \times 16.93125[/tex]

sry if im wrong

There are approximately 1.204 x 10²⁴ oxygen atoms in 75 g of SO₃.

To calculate the number of oxygen atoms in 75 g of SO₃, we need to consider the molar mass of SO₃ and Avogadro's number.

The molar mass of SO₃ is calculated as follows:

Sulfur (S) = 32.07 g/mol

Oxygen (O) = 3 x 16.00 g/mol = 48.00 g/mol

Total molar mass of SO₍ = 32.07 g/mol + 48.00 g/mol = 80.07 g/mol

Next, we need to determine the number of moles of SO₃ in 75 g:

moles = mass / molar mass = 75 g / 80.07 g/mol ≈ 0.9369 mol

Since each molecule of SO₃ contains 3 oxygen atoms, we can calculate the number of oxygen atoms by multiplying the number of moles of SO₃ by Avogadro's number (6.022 x 10²³ atoms/mol) and then multiplying by 3:

Number of oxygen atoms = 0.9369 mol x 6.022 x 10²³ atoms/mol x 3 = 1.604 x 10²⁴ atoms

Therefore, there are approximately 1.204 x 10²⁴ oxygen atoms in 75 g of SO₃.

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In balancing a chemical equation, which of the following are you allowed to do?
A) change coeffecients
B) change superscripts
C) change subscripts
D) add new substances

Answers

Answer:

Change Coefficients

Thank you

When you balance an equation you can only change the coefficients(the numbers in front of molecules of atoms). Coefficients are the numbers in front of the molecule. Subscripts are the smaller numbers found after atoms. These cannot be changed when balancing chemical equations
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