1. Name the structure that the arrow points to

Answer:

100°C

Explanation:

The higher temperature causes the molecules to increase in speed, and kinetic energy is greatest in the gas phase.

Answer:

OZONE...............

Question:

How are changes of state different from chemical change?

Answer:

Physical changes alter only the size, shape, form or matter state of a material. Water boiling, melting ice, tearing paper, freezing water and crushing a can are all examples of physical changes.

On the other hand, chemical changes are a bit different. In a chemical change, a new substance is formed.

Answer:

Chemical change happens when a substance changes they molecular structure, it often involves change in color (rusting iron), transfer of energy (copper smelting), or gas bubbling.

Changes of state is a physical change. An example is ice, it melts to create water. Water then can be freezed back to ice. Water is still H2O in both states（solid/liquid) Dissovling is another example. You can dissolve salt in water and can separate it by evaporating water and leaving the salt behind.

Explanation:

Answer: similar: Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams. Different:Protons are a type of subatomic particle with a positive charge. And  Neutrons are a type of subatomic particle with no charge (they're neutral).

Explanation:

hope that helped

Answer:

similarity:Protons and neutrons have about the same mass

Difference protons have a positive charge while neutrons have no charge

Explanation:

Answer:

yes but first he need to check himself

Explanation:

bcoz if he cannot produce a sperm than she might have cheated him and the baby might be of someone other.

Answer:

NaClO; the contained elements ae Na, Cl, O.

Answer:

5.6667*10^-3mol\L

Explanation:

get the number of moles:

0.0232\(40+32+16+16+16+16)=1.7*10^-3

get the consentration:

1.7*10^-3 \0.3=5.6667*10^-3mol\L

Answer:

Single displacement reaction.

Explanation:

Hello!!

In this case, since the reaction between silver nitrate and copper metal is:

[tex]2AgNO_3(aq)+Cu(s)\rightarrow 2Ag(s)+Cu(NO_3)_2(aq)[/tex]

As silver was forming silver nitrate, due to the presence of copper, which has the capacity to displace silver out of the salt, we notice the formation of solid silver and a resulting copper (II) nitrate which is blue in aqueous solution.

Therefore, this is a single displacement reaction, because the the lonely copper displaced the silver.

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Temperature to reach the pressure : 2657 °C

Gay Lussac's Law  

When the volume is not changed, the gas pressure is proportional to its absolute temperature  

[tex]\tt \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}[/tex]

P₁=605 torr

T₁=20 + 273 = 293 K

P₂=6050 torr

[tex]\tt T_2=\dfrac{T_i\times P_2}{P_1}\\\\T_2=\dfrac{293\times 6050}{605}\\\\T_2=2930~K=2657~^oC[/tex]

Answer:

Explanation:

Zinc chloride, ZnCl2, can be prepared by a direct reaction or by evaporating the aqueous solution formed in various reactions. It is strongly deliquescent (water-absorbing) and is utilized as a drying agent and as a flux.4

plz mark as brainliest

Answer:

0.54M of Ba(OH)2

Explanation:

When Ba(OH)2 reacts with HCl, BaCl2 and H2O are produced as follows:

Ba(OH)2 + 2HCl → BaCl2 + 2H2O

The remanent hydroxide ion is because not all Ba(OH)2 reacts. Thus, we need to find moles of Ba(OH)2 that doesn't react and moles of Ba(OH)2 that reacts. The ratio between total moles and volume of the Ba(OH)2 solution = 0.050L is the molarity of the original solution

Moles of Ba(OH)2 that doesn't react:

50mL + 150mL = 0.200L * (0.12 mol OH- / L) = 0.024 moles OH-

2 moles of OH- are in 1 mole of Ba(OH)2:

0.024 moles OH- * (1mol Ba(OH)2 / 2 mol OH-) = 0.012 moles Ba(OH)2

Moles of Ba(OH)2 that react:

0.150L * (0.20mol / L) = 0.030 moles HCl

2 moles of HCl react per mole of Ba(OH)2:

0.030 moles HCl * (1mol Ba(OH)2 / 2 mol HCl) = 0.015 moles Ba(OH)2

Total moles:

0.012mol + 0.015mol = 0.027mol Ba(OH)2 in 50mL

0.027mol Ba(OH)2 / 0.0500L =

0.54M of Ba(OH)2

The mass m of a single molecule in the gas is 32.19 g

The root square mean  (R.M.S) velocity V of the molecules of a really perfect fuel is given with the aid of the expression, v=sqrt(3RTM) and v=sqrt(3KTm) where R is universal gas consistent, T is absolutely the (Kelvin) temperature, m is the molar mass, okay is Boltzmann's consistent and M is the molecular mass.

The basis-mean-square speed is utilized in fuel, for the measure of the speed of debris, mentioned as the square root of the common speed-squared of the molecules in a gas. it's far represented with the aid of the equation:

Calculation:-

vrms=√3RT/M,

M = √3RT/vrms

   = 1.732 × (8.314) ×418 / 187

  = 32.19 g

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Answer:

0.0023 cm

Explanation:

The following data were obtained from the question:

Length (L) = 55 cm

Breadth (B) = 23.3 cm

Volume (V) = 2.9 cm³

Thickness (T) =?

Thus, we can obtain the thickness of the aluminum foil as illustrated below:

V = L × B × T

2.9 = 55 × 23.3 × T

2.9 = 1281.5 × T

Divide both side by 1281.5

T = 2.9/1281.5

T = 0.0023 cm

Therefore, the thickness of the aluminum foil is 0.0023 cm

Answer:

B on EDGE 2021

Explanation:

THE ANSWER ABOVE IS INCORRECT brainliest pls?

Given the solution containing HCl, the solution is likely to have a low pH and a high poH

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

The pH scale is a scale that gives an understanding of the variation of the acidity / alkalinity of a solution.

The scale ranges from 0 to 14 indicating:

However, it should be noted that as the pH increases, pOH decreases and as pH decreases, pOH increases.

Considering the question given above, the solution (HCl) is acidic.

Therefore, the solution will have a low pH and a high pOH

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Answer:

specific heat = .897 J /g°C

Explanation:

Quantity of heat added = mass x specific heat x rise in temperature

3610 = 77.3 x specific heat x 52.1

specific heat = .897 J /g°C

Unknown metal is Aluminium .

Answer:

The pH of the solution is 1.68.

Explanation:

Hope this helped!

Answer:

the fuel efficiency in kilometers per liter is 16.561 kilometer per liter

Explanation:

The computation of the full efficiency in kilometers per liter is shown below:

39.0 miles ÷ gallon = (39.0 miles ÷ gallon) × (1.6094 km ÷ 1 miles)  × (1 gallon ÷ 3.79 L)

Now cut the opposite miles and gallons

So, the fuel efficiency would be

= 16.561 kilometers per liter

Hence, the fuel efficiency in kilometers per liter is 16.561 kilometer per liter

Answer:

APT is made of a nitrogen base (adenine), a ribose sugar, and three phosphate groups.

Hope this helped! :)

Answer:

The energy released from each molecule of glucose is used to attach a phosphate to each of four molecules of adenosine diphosphate (ADP) to produce two molecules of adenosine triphosphate (ATP) and an additional molecule of NADH.

Explanation:

When sodium is present, it is challenging to distinguish potassium because sodium causes the flame to have the most vivid and lasting color.

Sodium should be absent if we wish to distinguish the coloration of other metals. In the absence of sodium, potassium tints the flame violet. However, we were able to identify the existence of both ions using a spectroscope. Only a few brightly colored lines in the spectrum can be detected when the light produced by an element's atoms is observed in a spectroscope.

A given excited atom may only undergo energy changes of specific fixed, definite amounts, as evidenced by the fact that it only emits radiation at a limited set of fixed wavelengths.

These ions' emission spectra can be seen to consist of a number of lines when we use a spectroscope to look at them. Each metal's series is distinct. In contrast to sodium, potassium has a distinctive set of lines. Thus, both are distinguishable from one another.

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The correct matches are:

a. 3. Galvanic cell.

b. 1. Cathode.

c. 2. Anode.

d. 5. Electrolytic cell.

e. 4. Half reaction.

Electrochemistry is the study of chemical reactions in which movement of electron happen.

An electrolytic cell is the cell in oxidation and reduction occurs.

It's all about how electrical energy interacts with chemical transformation.

For example, is concerned with the study of electrochemical cells. It is concerned with cells that convert chemical to electrical energy.

Thus, the correct matches are a. 3. Galvanic cell.

b. 1. Cathode.

c. 2. Anode.

d. 5. Electrolytic cell.

e. 4. Half reaction.

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Answer:

Examples of ROS include peroxides, superoxide, hydroxyl radical, singlet oxygen, and alpha-oxygen.

Answer:

Ammonia is moderately a base

Answer:

V = 27.98 L

Explanation:

Given data:

Mass of CO₂ = 33.0 g

Pressure = 500 torr

Temperature = 27°C

Volume occupied = ?

Solution:

Number of moles of CO₂:

Number of moles = mass/molar mass

Number of moles = 33.0 g/ 44 g/mol

Number of moles = 0.75 mol

Volume of CO₂:

PV = nRT

R = general gas constant = 0.0821 atm.L/ mol.K  

Now we will convert the temperature.

27+273 = 300 K

Pressure = 500 /760 = 0.66 atm

By putting values,

0.66 atm×V = 0.75 mol × 0.0821 atm.L/ mol.K  × 300 K

V = 18.47 atm.L/0.66 atm

V = 27.98 L

The volume that will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C is 28.11L.

The volume of an ideal gas can be calculated using the ideal gas law equation as follows:

PV = nRT

Where;

According to this question;

0.657 × V = 0.75 × 0.0821 × 300

0.657V = 18.4725

V = 18.4725 ÷ 0.657

V = 28.11L

Therefore, the volume that will be occupied by 33.0 grams of CO2 at 500 torr and 27 °C is 28.11L.

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Double replacement :

2Na₃PO₄+3CaCl₂⇒6NaCl + Ca₃(PO₄)₂

1. A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

2. Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

3. Combination/syntesis : 2 or more reactants combine to form a new compound

4. Decomposition : the reactant is decomposed into 2/more products

If we look at the reaction options available, all of them can be included in the double replacement reaction, but we only choose the reaction from Sodium phosphate and Calcium chloride which leads to options: C because it is balanced (from the number of atoms in the same reactant and product) and is in accordance with the chemical formula of each compound (both products and reactants)

Answer:

Convection currents are caused by a temperature difference in gases and liquids. As one area becomes warmer than another the molecules have more energy and start vibrating more vigorously thus spreading out and becoming less dense. This means that the less dense parts will become more buoyant causing them to rise.

Explanation:

Answer:

Convection currents are caused by a temperature difference in gases and liquids.  

Explanation:

As one area becomes warmer than another the molecules have more energy and start vibrating more vigorously thus spreading out and becoming less dense. This means that the less dense parts will become more buoyant causing them to rise.

Answer:

Given info : 500 cc of 2N Na2CO3 are mixed with 400 cc of 3N H2SO4 and volume was diluted to one litre. To find : will the resulting solution is acidic , basic or neutral ? Calculate the molarity of the dilute solution. solution : no of moles of Na2CO3 = normality/n %3D - factor x volume 2/2 x 500/1000 = 0.5 mol %D no of moles of H2SO4 = 3/2 x 400/100O = 0.6 mol %3D We see, Na2CO3 + H2S04 => Na2S04 + CO2 + H2O Here one mol of Na2C03 reacts with one mole of H2SO4. So, 0.5 mol of Na2CO3 reacts with 0.5 mol of H2SO4. so, remaining 0.1 mol of H2SO4 makes solution acidic. Now molarity of solution = remaining no of moles of H2SO4/volume of solution= 0.1/1 = %3D 0.1M

"When 500 cc of 2N [tex]Na_{2}CO_{3}[/tex] is mixed with the 400 cc of 3N [tex]H_{2} SO_{4}[/tex] and volume was diluted to one liter then solution will be acidic and molarity will be 0.55 mol"

What is Molarity?

The molar concentration of a chemical species, specifically a solute in a solution, is measured in terms of the amount of material per unit volume of solution.

It is given that normality of [tex]Na_{2}CO_{3}[/tex] is 2 and [tex]H_{2} SO_{4}[/tex] is 3. It can be written in term of molarity like, the molarity of [tex]Na_{2}CO_{3}[/tex] is 0.1 M and molarity of [tex]H_{2} SO_{4}[/tex] is 1.5 M.

Now calculate the number of moles in [tex]Na_{2}CO_{3}[/tex]

For [tex]Na_{2}CO_{3}[/tex] = 500 cc / 1000 cc/L ×0.1 mol/L =0.05 mol.

For [tex]H_{2} SO_{4}[/tex] = 400 cc/ 1000 cc/L × 1.5mol /L = 0.60 mol.

It can be said that 0.05 mol reacts with  0.05 mol [tex]H_{2} SO_{4}[/tex] .

Now calculate the molarity of  [tex]H_{2} SO_{4}[/tex] solution= 0.55 mol /L = 0.55 mol.

Hence, remaining 0.1 mol solution will make acidic.

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Answer:

66.7%

Explanation:

The reaction for the titration of the excess ferrous ion is:

We calculate the moles of Fe⁺² from the used moles of KMnO₄:

Then we substract those 0.30 mmol from the original amount used:

The reaction between ferrous ammonium sulfate and MnO₂ is:

So we convert those 3.5 mmol Fe⁺² that were used in this reaction to MnO₂ moles:

Then we convert MnO₂ to Mn₃O₄, using the reaction:

Finally we convert Mn₃O₄ moles to grams:

And calculate the percent

Answer:

2.21m

Explanation:

Molality, m, is defined as the ratio between moles of solute (The substance that is in less amount, sodium sulfide) and kilograms of solvent (Water, in this case).

Thus, we need to convert mass of sodium sulfide to moles using its molar mass and grams of water to kilograms:

Moles Na2S (Molar mass: 78.0452g/mol):

37.5g * (1mol / 78.0452g) = 0.48 moles Na2S

Kilograms water:

217g * (1kg / 1000g) = 0.217kg

Molality:

0.48 moles Na2S / 0.217kg =

Answer:

2.21

Explanation: