what's the valency of lead in pbO2​

Answer:

C. C and Pb

Both are in group IV elements.

Answer:

1) chloroplast

A chloroplast is an organelle within the cells of plants and certain algae that is the site of photosynthesis, which is the process by which energy from the Sun is converted into chemical energy for growth.

2)Photosynthesis is the process in which light energy is converted to chemical energy in the form of sugars. In a process driven by light energy, glucose molecules (or other sugars) are constructed from water and carbon dioxide, and oxygen is released as a byproduct.

3)i need the photo to answer

Explanation:

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Answer:

0.350 g of iron

Explanation:

Step 1: Given data

Mass of iron (m): 350 mg

Step 2: Convert the mass of iron to milligrams

In order to convert the mass of iron from grams to milligrams we need a conversion factor. In this case, the conversion factor is 1 g = 1,000 mg.

350 mg Fe × 1 g Fe/1,000 mg Fe = 0.350 g Fe

350 milligrams of iron is equal to 0.350 grams of iron. We conserve the 3 significante figures of the original data.

Answer:

Ag+o ___>2Ag+3o

I think is answer

Answer:

4Ag  +  O₂   →    2Ag₂O

Explanation:

Given reaction expression:

               Ag  +  O₂   →    Ag₂O

The problem here is to balance the expression.

We are going to use a mathematical approach to solve this problem. Therefore, assign coefficients a,b and c to the species:

                     aAg  +  bO₂   →    cAg₂O

Conserving Ag;   a  = 2c

                    O;     2b  = c

Now let c = 1;

              a  = 2

              b  = [tex]\frac{1}{2}[/tex]  

Multiply a, b and c through by 2;

            a  = 4, b = 1 and c  = 2

                       4Ag  +  O₂   →    2Ag₂O

Answer:

a) 0.018 ft^3

b) 55.55 lb/ft^3

Explanation:

given that mass m = 2 lb

volume = 62.6 in^3

= 0.036 ft^3

now, specific volume  = volume/mass  [specific volume is the reciprocal of density]

=0.036/2 = 0.018 ft^3.

b) density = mass/ volume = 2/0.036 = 55.55 lb/ft^3

Answer: True

Explanation:

i think it's d white one cause it's has less volume but more matter making its mass volume ratio high than that of the blue one

The white cube is denser, because it has less volume, but a lot more matter. So option D is correct.

A material called matter is made up of several kinds of particles, occupies space, and has inertia. The many sorts of particles each have a unique mass and size according to the fundamentals of current physics. The electron, proton, and neutron are three examples of material particles that are most well-known.

A material with a given mass and a certain volume in space is referred to as a matter. Examples of matters are pens, pencils, toothbrushes, water, and milk, as well as vehicles like cars, buses, and bicycles.

According to its physical and chemical makeup, "matter" can be defined as being composed of atoms. Ordinary matter is another name for such atomic stuff. For instance, since DNA molecules are composed of atoms, they fall under the notion of matter.

Thus, option D is correct.

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This is displacement reaction.

Answer:

number 7 is GROWTH

number 8 is TARGET CELLS

number 9 is pituitary gland

Explanation:

To convert moles to particles or grams to particles, let us have a firm understanding of what a mole is.

A mole is the unit of measuring quantity of particles.

It is the amount of substance that contains the Avogadro's number of particles.

The particle can be atoms, molecules, formula units, electrons, protons, neutrons, etc.

 So, to convert from moles to particles;

    1 mole of a substance  contains 6.02 x 10²³ particles

To convert from grams to particles;

  First convert to moles;

        number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

  So,    1 mole of a substance  contains 6.02 x 10²³ particles

Answer:

Reaction rate

Explanation:

We are told that Ben observes how quickly some dry wood is burning in a campfire.

This is an example of reaction rate because it tells us the speed i.e. how fast the dry wood is reacting with the camp fire.

Answer:

1. Litres

2. minutes

3. Kelvin (K)

4. Kilometer/hour

5. hours

6. Litre

7. metre

8. metre

9. Litres

10. milliliters

Explanation:

1. Coca-Cola is a liquid substance, hence, its volume must be measured in LITRES.

2. This question is related to time I.e. being early, hence, the unit of measurement is MINUTES.

3. The unit of temperature is Kelvin (K). Therefore, water boils at 373K

4. This question is related to speed, whose unit of measurement is kilometer/hour (km/hr).

5. A movie runs with time, which is measured in HOURS.

6. Mineral water is a liquid, which can only be bought per volume. Hence, the appropriate unit is LITRE.

7. Height is measured in metres (m). Therefore, one can say that " the height of your younger brother is 10metres"

8. The length of a substance is also measured in metres.

9. Volume is measured in LITRES

10. Cough syrup is a drug whose volume is quantified by millilitres i.e. a thousandth litre

Answer:

Explanation:

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Answer:

Explanation:

Silicon, phosphorus, sulphur, and chlorine oxides are acidic

Sodium oxide, which reacts with water to produce sodium hydroxide. Magnesium oxide, which reacts with hydrochloric acid to form magnesium chloride. Copper(II) oxide, which reacts with nitric acid to form copper nitrate are basic.

Answer:

Yes, water molecules becomes gas particles when the vapor pressure is lower than the external atmospheric temperature.

Explanation:

Vapor pressure is defined as the pressure of the vapor that lies above its surface. In other words, it is the pressure of the vapor which results from the evaporation of a liquid which is above a liquid in a closed or open container.

The liquid starts boiling or evaporation takes place when the vapor pressure of the liquid becomes equal to the external or atmospheric pressure. Now when the vapor pressure is less than the atmospheric pressure, the liquid boils at a higher temperature while when vapor pressure is more than the atmospheric temperature, the liquid starts boiling a lower temperature.

No water molecule is converted into gas when the atmospheric pressure is higher than vapour pressure.

No, water molecules will not become gas particles when the vapor pressure is lower than atmospheric pressure because of the higher pressure of surrounding environment on the water molecules. The water in liquid form is converted into gas form and evaporated when the vapour pressure is equal or higher than atmospheric pressure.

So if the vapour pressure is lower than the atmospheric pressure than the water molecules will not become gas particle so we can conclude that no water molecule is converted into gas when the atmospheric pressure is higher than vapour pressure.

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Answer:

protons are red neutrons are green electrons are yellow

Explanation:

TIE FIGHTERS GO ZOOOOOM

Answer: The molar enthalpy change is 73.04 kJ/mol

Explanation:

[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]

moles of HCl= [tex]molarity\times {\text {vol in L}}=0.415mol/L\times 0.1=0.0415mol[/tex]

As NaOH is in excess 0.0415 moles of HCl reacts with 0.0415 moles of NaOH.

volume of water = 100.0 ml + 50.0 ml = 150.0 ml

density of water = 1.0 g/ml

mass of water = [tex]volume \times density=150.0ml\times 1.0g/ml=150.0g[/tex]

[tex]q=m\times c\times \Delta T[/tex]

q = heat released

m = mass  = 150.0 g

c = specific heat = [tex]4.184J/g^0C[/tex]

[tex]\Delta T[/tex] = change in temperature = [tex]4.83^0C[/tex]

[tex]q=150.0\times 4.184\times 4.83[/tex]

[tex]q=3031.3J[/tex]

Thus 0.0415 mol of HCl produces heat = 3031.3 J

1 mol of HCL produces heat = [tex]\frac{3031.3}{0.0415}\times 1=73043.3J=73.04kJ[/tex]

Thus molar enthalpy change is 73.04 kJ/mol

Answer:

89.6 F

Explanation:

Brain-List?

Answer:

That is sodium

Explanation:

Sodium is found there

Answer:

[tex]Q=1.9x10^8J[/tex]

Explanation:

Hello!

In this case, since we first know the heat and mass of the first experiment, we are able to compute enthalpy of vaporization of gasoline as shown below:

[tex]Q=m\Delta _{vap} H\\\\\Delta _{vap} H=\frac{11kcal}{1.0g} =11\frac{kcal}{g}[/tex]

Next, we need to the compute the grams in 1.5 gallons of gasoline via its density with the proper units:

[tex]m_{gasoline}=1.5gal*\frac{3785.41mL}{1gal}*\frac{0.74g}{1mL} =4202g[/tex]

Therefore, the new joules are computed via:

[tex]Q=4202g*11\frac{kcal}{g}*\frac{1000cal}{1kcal}*\frac{4.184J}{1cal}\\\\Q=1.9x10^8J[/tex]

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Answer:

Answers with detail are given below

Explanation:

1) Given data:

Mass of Rb₃Rn = 76.19 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 478.43 g/mol

Number of moles = 76.19 g/ 478.43 g/mol

Number of moles = 0.16 mol

2) Given data:

Mass of FrBi₂ = 120.02 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 640.96 g/mol

Number of moles = 120.02 g/640.96 g/mol

Number of moles = 0.19 mol

3) Given data:

Mass of Zn₂F₃ = 88.24 g

Number of moles = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 187.73 g/mol

Number of moles = 88.24 g/ 187.73 g/mol

Number of moles = 0.47 mol

4) Given data:

Number of moles of Sb₄Cl = 1.20 mol

Mass of Sb₄Cl = ?

Solution:

Number of moles = mass/molar mass

Molar mass = 522.49 g/mol

Mass = Number of moles × molar mass

Mass = 1.20 mol ×  522.49 g/mol

Mass = 626.99 g

United States

The jet stream is oriented from west to east across the southern portion of the United States, during El Niño. Although El Niño's strongest impacts are felt around the equatorial Pacific, they can affect weather around the world by influencing high and low pressure systems, winds and precipitation. And as the warmer ocean waters release excess energy (heat) into the atmosphere, global temperatures rise.

During La Niña, the jet stream and severe weather are likely to be farther north. It refers to the periodic cooling of sea-surface temperatures across the east-central equatorial Pacific.

El Niño and La Niña result from interaction between the surface of the ocean and the atmosphere in the tropical Pacific. Changes in the ocean impact the atmosphere and climate patterns around the globe. In turn, changes in the atmosphere impact the ocean temperatures and currents.

The region chosen is United States and the southern tier of Alaska and the U.S. Pacific Northwest tends to be warmer than average during El Niño and La Niña.

This is defined as the average weather condition of a place over a given period of time.

The  U.S.southern tier of state also tends to be cooler during this period which makes it the most appropriate choice.

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If closer means that it is inner, then it would be they are closer and made of rocks.

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Answer:

The answer would be ice, heat, water, and wind. (Hope this helps).

Answer:

the last four options

ice

heat

water

wind

Explanation:

edg2020

Answer:

Snow and ice have high albedo – much of the sunlight hitting surfaces covered with snow and ice bounces back. ... Thus, the proportion of Earth's surface that is covered by ice and snow affects how much of the Sun's solar radiation is absorbed, warming the planet, or reflected.

_____________________________________________

M = m/v

= 100ml ÷ 2 spoons × 100%

= - 5,000 μg/ppb³

= 50% Diluted

M = m/v

= 200ml ÷ 5 spoons × 100%

= - 4,000 μg/ppb³

= 40% Diluted

M = m/v

= 300ml ÷ 6 spoons × 100%

= - 5,000 μg/ppb³

= 50% Diluted

M = m/v

= 600ml ÷ 8 spoons × 100%

= - 75,000 μg/ppb³

= 75% Diluted

_____________________________________________

Answer:

iron (III) oxide =Fe2O3

iron(III) carbonate =Fe2(CO3)3

Answer:

Specific heat of metal of the metal is 0.8394J/g°C

Explanation:

The heat the water gain is the same losing for the metal. The equation is:

m(Metal)*ΔT(Metal)*S(Metal) = m(Water)*ΔT(Water)*S(Water)

Where m is mass: 66.0g water and 28.5g Metal

ΔT is change in temperature: (95.25°C-27.84°C) = 67.41°C for the metal and (27.84°C - 22.00°C) = 5.84°C for the water

And S is specific heat of water (4.184J/g°C) and the metal

Replacing:

28.5g*67.41°C*S(Metal) = 66.0g*5.84°C*4.184J/g°C

S(Metal) = 0.8394J/g°C