Soot is formed as a candle burns

a
Chemical Change
b
Physical Change

If we had used 4 grams of NaOH instead of 2 grams, the heat gained by the solution would have been higher.

The term enthalpy has to do with the heat that could be emitted or evolved in a given reaction. We know that in a neutralization reaction, there is an evolution of heat and as such the reaction  vessel would feel warm at the end of the reaction.

Also, the enthalpy would depend on the amount of the limiting reactant. In this case, the limiting reactant would be the sodium hydroxide and as such the enthalpy would affected by a change in the amount of the sodium hydroxide.

Learn more about enthalpy:https://brainly.com/question/13996238

#SPJ1

The measure of how densely a material is packed together is called density. As the mass per unit volume, it has that definition. The density of aluminum in g/cm³ is 2.70 g/cm³.

A substance's density is a measurement of how heavy it is in relation to its size. If an object is placed in water, it will float if it is less dense than the water, and it will sink if it is more dense. The density of a material is a distinguishing quality that is independent of the substance's volume.

The volume of the metal =315 cm³

Then density is:

Density = mass /volume

Density of metal = 851 g / 315cm³

D = 2.70 g / cm³

To know more about density, visit;

brainly.com/question/29775886

#SPJ7

Answer:

It would take approximately 81.65 kJ (or 81,650 J) of heat to convert 230.0g of ice at -10C to water at 0C.

Explanation:

To calculate the amount of heat needed to convert ice at -10°C to water at 0°C, we need to consider two steps:

1. Heating the ice from -10°C to 0°C (heat required to raise the temperature of ice)

2. Melting the ice into water at 0°C (heat required to change the state of ice)

Let's first calculate the heat required for step 1:

Q1 = m × c × ΔT

where Q1 is the heat required, m is the mass of the ice, c is the specific heat capacity of ice, and ΔT is the change in temperature.

The specific heat capacity of ice is 2.09 J/g°C, and ΔT is (0°C - (-10°C)) = 10°C.

So, Q1 = 230.0 g × 2.09 J/g°C × 10°C = 4827 J

Now, let's calculate the heat required for step 2:

Q2 = m × Lf

where Q2 is the heat required, m is the mass of the ice, and Lf is the latent heat of fusion of ice.

The latent heat of fusion of ice is 334 J/g.

So, Q2 = 230.0 g × 334 J/g = 76820 J

Therefore, the total amount of heat needed to convert 230.0g of ice at -10C to water at 0C is:

Qtotal = Q1 + Q2 = 4827 J + 76820 J = 81647 J

Therefore, it would take approximately 81.65 kJ (or 81,650 J) of heat to convert 230.0g of ice at -10C to water at 0C.

Answer:

Its will particles move faster and its temperature will rises more.

Explanation:

The pH of the solution is 7.00. First, we need to determine the number of moles of HNO₃ and LiOH:

moles HNO₃ = (0.150 mol/L) x (0.0250 L) = 0.00375 mol

moles LiOH = (0.250 mol/L) x (0.0400 L) = 0.0100 mol

Next, we need to determine which reactant is limiting. From the balanced chemical equation:

HNO₃ + LiOH → LiNO₃ + H₂O

We can see that the stoichiometric ratio of HNO₃ to LiOH is 1:1. Therefore, HNO₃ is the limiting reactant.

Since HNO₃ is a strong acid and LiOH is a strong base, they will react completely to form water and LiNO₃. The moles of HNO₃ that reacted will be equal to the moles of H₃O⁺ formed.

moles H₃O⁺ = 0.00375 mol

To determine the concentration of H₃O⁺ in solution, we need to determine the total volume of the solution:

Vtotal = 25.0 mL + 40.0 mL = 65.0 mL = 0.0650 L

Now we can use the equation for the dissociation of water:

Kw = [H₃O⁺][OH⁻]

Assuming that the initial concentration of OH⁻ is negligible, we can simplify this to:

Kw = [H₃O⁺]²

Taking the negative logarithm of both sides:

-pKw = 2pH

where pKw = 14.00 at 25°C. Substituting in the values we have determined:

-14.00 = 2pH - > pH = -14.00/2 = -7.00

Therefore, the pH of the solution is 7.00.

Learn more about pH ,

https://brainly.com/question/15289714

#SPJ4

Answer:

neck

Explanation:

through the neck and opening of the thermos, where there is no vacuum.. hence heat is easily transmitted resulting into heat loss

In pulmonary ventilation, the movement of gases is between the atmosphere and the alveoli of the lungs.

It is the process of inhalation and exhalation of air from the lungs. This happens because of the difference of pressure due to contraction and relaxation.

Inspiration occurs intrapleural cavity enlarges due to diaphragm's contraction which pulls it down. intrapleural cavity also occurs when ribs are elevated.

In  pulmonary ventilation, three different pressures are included; Atmospheric pressure, Interalveolar pressure, Intrapleural pressure.

The pressure outside the body is known as atmospheric pressure. Pressure inside the alveoli of the lungs is known Interalveolar pressure. The pressure in the  pleural cavity is known as Intrapleural pressure.

If you need to learn more about atmospheric pressure, click here

https://brainly.in/question/3554602

#SPJ4

The molar solubility of mercury (II) bromide (HgBr2) is 7.00 × 10^-7 M. This is the long answer to the problem.

To perform calculations using Ksp for the given equilibrium HgBr2(s)  ↔ Hg2+(aq) + 2Br-(aq) and find the molar solubility of mercury (II) bromide (HgBr2) we have to use the solubility product expression.Ksp for HgBr2 is 6.2 × 10^-20Ksp = [Hg2+][Br-]^2 Since the initial concentration of HgBr2 is given as s, and after dissociation, the concentration of Hg2+ becomes s, while the concentration of Br- becomes 2s.[Hg2+] = s M and [Br-] = 2s MThus,Ksp = [Hg2+][Br-]^2= s(2s)^2= 4s^3= 6.2 × 10^-20Molar solubility of HgBr2 is given as s, therefore;s = (6.2 × 10^-20/4)1/3s = 7.00 × 10^-7 M

To know more about molar solubility visit:-

https://brainly.com/question/31043999

#SPJ11

Explanation:

when in equilibrium condition the total sum of anti clockwise moment is equal to the sum of clock wise moment

Answer:

Newton's First Law of Motion states that in order for the motion of an object to change, a force must act upon it. This is a concept generally called inertia.

Newton's Second Law of Motion defines the relationship between acceleration, force, and ​mass.

Newton's Third Law of Motion states that any time a force acts from one object to another, there is an equal force acting back on the original object. If you pull on a rope, therefore, the rope is pulling back on you as well.

Explanation:

The  spin quantum number will be 2 and 2.5 and multiplicity in each case will be 5 and 6.

The angular momentum of such an electron is described by its spin quantum number (ms). An electron carries orbital angular momentum in addition to angular momentum around its axis of rotation. The Spin Quantum Number (s) really does have a magnitude (1/2) and a direction (+ or -) since angular momentum would be a vector.

(i) If an atom has 4 electrons then it will have total

Total spin quantum number = 1/2+1/2+1/2+1/2 = 4/2=2

Multiplicity = 2S+1= 2×2+1=5

(ii)  If an atom has 5 electrons then it will have

Total spin quantum number = 1/2+1/2+1/2+1/2+1/2 = 5/2 = 2.5

Multiplicity = 2S+1= 2×2.5+1=6

Therefore, the spin quantum number will be 2 and 2.5

To know more about  multiplicity

https://brainly.com/question/14266366

#SPJ4

Answer:

Tin(IV) oxide, also known as stannic oxide, is the inorganic compound with the formula SnO₂. The mineral form of SnO₂ is called cassiterite, and this is the main ore of tin. With many other names, this oxide of tin is an important material in tin chemistry. It is a colourless, diamagnetic, amphoteric solid.

Formula: SnO₂

Molar mass: 150.71 g/mol

Melting point: 1,630 °C

Density: 6.95 g/cm³

Aluminium oxide is a chemical compound of aluminium and oxygen with the chemical formula Al₂O₃. It is the most commonly occurring of several aluminium oxides, and specifically identified as aluminium(III) oxide.

Formula: Al₂O₃

Molar mass: 101.96 g/mol

Melting point: 2,072 °C

Density: 3.95 g/cm³

Boiling point: 2,977 °C

ChemSpider ID: 14086

ChemSpider ID: 26988

Silver sulfide is an inorganic compound with the formula Ag ₂S. A dense black solid, it is the only sulfide of silver. It is useful as a photosensitizer in photography. It constitutes the tarnish that forms over time on silverware and other silver objects.

Formula: Ag2S

Molar mass: 247.8 g/mol

Density: 7.23 g/cm³

ChemSpider ID: 145878

Copper(II) sulfate, also known as copper sulphate, are the inorganic compounds with the chemical formula CuSO₄ₓ, where x can range from 0 to 5. The pentahydrate is the most common form. Older names for this compound include blue vitriol, bluestone, vitriol of copper, and Roman vitriol.

Formula: CuSO4

IUPAC ID: Copper(II) sulfate

Molar mass: 159.609 g/mol

Density: 3.6 g/cm³

Melting point: 110 °C

Soluble in: Water

Potassium carbonate is the inorganic compound with the formula K₂CO₃. It is a white salt, which is soluble in water. It is deliquescent, often appearing as a damp or wet solid. Potassium carbonate is mainly used in the production of soap and glass.

Formula: K2CO3

Molar mass: 138.205 g/mol

IUPAC ID: Potassium carbonate

Density: 2.43 g/cm³

Melting point: 891 °C

Soluble in: Water

Explanation:

Hope it is helpful....

Answer:nucleus protons nuetrons electrons

Explanation:

The smallest partical into which an element can be divied and still be the smallest element

.( A basic unit o f matter)

Answer:

Nucleus, electrons, and protons

Explanation:

Multiple experiments and results accumulated over the years. Dalton is credited through his ray cathode tube experiments, and Rutherford's Gold Foil experiment led to the discovery of the positively charged nucleus and protons. His student Chadwick continued his studies and discovered the neutron.

Answer:

Compute the reaction rate to the nearest whole number using the formula below,

mass of tablet/volume of water

Reaction Rate = mas

reaction time

3°C Reaction time = 138.5 sec

Reaction rate = mg/l/sec

24°C Reaction time = 34,2 sec

Reaction rate = mg/L/sec

40°C Reaction time = 26.3 sec

Reaction rate = mg/L/sec

65°C Reaction time = 14.2 sec

Reaction rate = mg/L/sec

Explanation:

I hope my answer help

Answer:

#1 is 36 (138.5 seconds)

#2 is 146 (34.2 seconds)

#3 is 190 (26.3 seconds)

#4 352 (14.2 seconds)

#5 is 145 (34.5 seconds)

#6 is 173 (28.9 seconds)

#7 is 216 (23.1 seconds)

Explanation:

Edge, we may have different orders.

Type of light each space telescope primarily uses is Shortest wavelength: Chandra, Hubble, Spitzer and Longest wavelength: Spitzer, Hubble, Chandra.

The Chandra X-ray Observatory primarily uses X-rays, which have very short wavelengths in the electromagnetic spectrum.

The Hubble Space Telescope primarily uses visible light, which has a slightly longer wavelength than X-rays. The Spitzer Space Telescope primarily uses infrared light, which has the longest wavelengths of the three types of light.

Therefore, the order of telescopes from shortest to longest wavelength is Chandra, Hubble, and Spitzer. Conversely, the order of telescopes from longest to shortest wavelength is Spitzer, Hubble, and Chandra.

Visit here to learn more about wavelength:

brainly.com/question/10728818

#SPJ11

Answer: 35.2mL

Explanation:

Take the mass of this silver chunk, and divide it by the density of silver to get the volume of silver. Add it to the volume of the water to get the total volume.
33.7g /(10.5g/mL) = about 3.2mL

32.0mL + 3.2mL = 35.2mL

Answer:

I don't know what is the actual answer

Answer:

1.3155M

Explanation:

molar mass of CuSO4

=63.55+32.07+16(4)

=159.62g/mol

n=mass/molar mass

n=42.00/159.62

n=0.2631mol

volume=200mL=0.2L

molarity=mole (n)/volume (v)

molarity=0.2631mol/0.2L

molarity=1.3155M

Answer:

SO2

Explanation:

SO2 causes acid rain which is leading to dissolving of the marble on the Taj Mahal

SO2 reacts with water to come down as sulfuric acid during acid rains

Answer: The partial pressure of \(N_{2}O\) is 0.35 atm.

Explanation:

Given: Total pressure = 0.98 atm

Partial pressure of \(O_{2}\) = 0.48 atm

Partial pressure of Ar = 0.15 atm

Partial pressure of \(N_{2}O\) = ?

Total pressure is the sum of partial pressure of each component present in a mixture of gases.

Hence, partial pressure of \(N_{2}O\) is calculated as follows.

Total pressure = \(P_{N_{2}O} + P_{O_{2}} + P_{Ar}\)

Substitute the values into above formula as follows.

\(Total pressure = P_{N_{2}O} + P_{O_{2}} + P_{Ar}\\0.98 atm = P_{N_{2}O} + 0.48 atm + 0.15 atm\\P_{N_{2}O} = 0.35 atm\)

Thus, we can conclude that the partial pressure of \(N_{2}O\) is 0.35 atm.

Answer:A.

Explanation:

In this case, the object receives the action. Which lines up with newton's law " an object will stay at rest unless acted upon by an outside force." The football is being kicked, which means a direct outside force acted upon this.

Newton's first law states that An object at rest will stay at rest unless acted upon by an outside force. The example D  a floating stick carried over the water fall depicts the first law of motion.

Newton proposed three laws to describe the motion of an object. The first law states that, an object at rest will stay at rest unless acted upon by an outside force. The tendency to stay in its current state is called inertia of the object.

Newton's second law states that, the force acting on an object is the product of its mass and acceleration. Third law of motion states that, for every action, there is an equal and opposite reaction.

Among the given options, the example, of the baseball player sliding onto the second base is an illustrating first law of motion. The baseball player slide to avoid over running and to protect themselves.

Find more on laws of motion:

https://brainly.com/question/29775827

#SPJ6

Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.

For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.

The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:

Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6

The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:

Ka1 × Kb1 = Kw

where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.

Kb1 can be calculated as follows:

Kw = Ka1 × Kb1

Kb1 = Kw / Ka1

Kw = 1.0 × 10^-14

Ka1 = 6.2 × 10^-5

Kb1 = Kw / Ka1

Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5

Kb1 = 1.61 × 10^-10

Kb2 can be calculated using the same method:

Kw = Ka2 × Kb2

Kb2 = Kw / Ka2

Kw = 1.0 × 10^-14

Ka2 = 2.3 × 10^-6

Kb2 = Kw / Ka2

Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6

Kb2 = 4.35 × 10^-9

Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.

To learn more about basic visit;

https://brainly.com/question/31939284

#SPJ11

Answer:

H₂SO₄

Explanation:

Hope this helps!

Answer:

acting together to break down rocks and minerals to form soil.

Explanation:

There are a whole range of weathering processes at work near the surface of the soil, acting together to break down rocks and minerals to form soil. ... As rocks and sediments are eroded away, so more of the solid rock beneath becomes vulnerable in turn to weathering and breakdown.

Answer:

a. 45×10³ kg

b. 1.25 kg

c. 5443200 s

d. 2.69×10⁻⁴ m/s²

e. 2.57×10⁻⁶N

f. 7.48×10⁻³ m /s²

g. 2.45 Pa

h. 10 m/s

Explanation:

The SI units are: kg, m, s, N, K, A, Pa, J and cd

a. 1 g is the mass for 1 cm³. We convert the m³ to cm³

45 m³. 1×10⁶ cm³ / 1 m³ = 45×10⁶ cm³

By the way, 45×10⁶ cm³ = 45×10⁶ g

We convert the g to kg →  45×10⁶ g . 1 kg / 1000 g = 45×10³ kg

b. As 1 g = 1 cm³,  we convert the cm³ to g and then, the g to kg

1250 cm³ = 1250 g → 1250 g . 1kg / 1000 g = 1.25 kg

c. 1 day has 24 hours; 1 hour has 60 minutes; 1 minute has 60 seconds

1 hour has 3600 s. Then 24 h . 3600 s / 1 h = 86400 s

86400 s/d. 63 d = 5443200 s

d. 1 min² = 3600 s²

97 cm / 3600 s² = 0.0269 cm/s²  / 100 = 2.69×10⁻⁴ m/s²

e. 927 g.cm / min² / 3600 s² = 0.2575 g.cm/s² → dyn

We need to convert dyn to N

1 dyn = 10⁻⁵N → 0.2575  dyn . 10⁻⁵N / 1dyn = 2.57×10⁻⁶N

f. 1 m/s² = 12960 km/h²

12960 km/h² . 1 m/s² / 97 km/h² = 7.48×10⁻³ m /s²

g. 2500 g/cm² . 1kg / 1000 g = 2.5 kg/cm²

1 Pa = 1.02kg/cm²

2.5 kg/cm² . 1 Pa / 1.02 kg/cm² = 2.45 Pa          

h. 1 h = 3600 s

36 km / 3600 s = 0.01 km /s → 0.01 km . 1000 m / 1 km = 10

= 10 m/s

In the given chemical equation, HCO3−+H2O→OH−+H2CO3, the acid-base pair is formed between HCO3− and H2CO3.

HCO3− is the base and H2CO3 is the conjugate acid. When HCO3− accepts a proton (H+) from H2O, it forms its conjugate acid, H2CO3.

Similarly, when H2CO3 donates a proton (H+) to OH−, it forms its conjugate base, HCO3−.

A conjugate acid-base pair is formed when an acid donates a proton to a base and forms its conjugate base, and the base accepts a proton and forms its conjugate acid.

In this reaction, HCO3− accepts a proton from H2O and forms its conjugate acid, H2CO3, and H2CO3 donates a proton to OH− and forms its conjugate base, HCO3−. Thus, the conjugate acid-base pair in this reaction is H2CO3 and HCO3−.

To summarize, the conjugate acid-base pair in the given reaction is H2CO3 and HCO3−, where H2CO3 is the conjugate acid and HCO3− is the conjugate base.

Understanding the concept of conjugate acid-base pairs is important in many areas of chemistry, including acid-base equilibria, buffer solutions, and chemical reactions.

learn more about reactions here:brainly.com/question/28984750

#SPJ11

Answer:

b..............

Explanation:

......

Answer:

i think the answer is D)

but u should ask the another person too:)