THIS IS A SCIENCE QUESTION

Which choice describes how temperature differences affect air?

A. Hot air rises, and cold air sinks.

B. Hot air sinks, and cold air rises.

C. Hot air is steady, and cold air moves fast.

D. Hot air moves fast, and cold air rises.

Answer

D

Explanation

the answer is D

Answer:

The answer is D.To use energy from sunlight to make sugars

Explanation:

Hope this helps <3

Answer: D) Monitor the sea level over set period of time.

Since global warming causes land ice to melt, that water goes into the ocean to raise sea levels. This is an effect of global warming.

Choices A through C are things to measure if you want to measure causes of global warming, so we can rule those out.

Answer:

Molar volume of CO₂ at 160 K = 0.02820 L per mole

molar volume of NH₃ at 160 K = 0.02024 L per mole

Note: The question is incomplete. The complete question is given below:

At standard temperature and pressure the molar volumes of CO2 and NH3 gases are 22.31 and 22.40L respectively. The densities of crystalline CO2 and NH3 at 160K are 1.56 and 0.84 g/cm^3, respectively. Calculate their molar volumes

Explanation:

molar mass of CO2 = 44.0 g/mol

molar mass of NH3 = 17.0 g/mol

Density = mass/volume

Therefore, Volume = mass/density

Volume of CO2 = mass of CO2/ density of CO2

Volume of CO2 = 44.0 g/mol / 1.56 g/cm³ = 28.20 cm³ per mole

Converting to liters 28.20 * 1 L/1000 cm³ = 0.02820 L per mole

Therefore, molar volume of CO2 at 160 K = 0.02820 L per mole

Volume of NH3 = mass of NH3/ density of NH3

Volume of NH3 = 17.0 g/mol / 0.84 g/cm³ = 20.24cm³ per mole

Converting to Liters; 20.24 cm³ * 1 L/1000 cm³ = 0.02024 L per mole

Therefore, molar volume of NH3 at 160 K = 0.02024 L per mole

Answer:

[tex]m=4.51g[/tex]

Explanation:

Hello!

In this case, since the energy involved during a heating process is shown below:

[tex]Q=mCp\Delta T[/tex]

Whereas the specific heat of water is 4.184 J/(g°C), we can compute the heated mass of water by the addition of 11.9 kJ (11900 J) of heat as shown below:

[tex]m=\frac{Q}{Cp\Delta T}[/tex]

Thus, by plugging in, we obtain:

[tex]m=\frac{11900J}{4.184\frac{J}{g\°C}(650\°C-20.0\°C)}\\\\m=4.51g[/tex]

Best regards!

Answer:

the answer is nitrogen

Answer:

1. Definition of Midpoint

2.Angle BCA is congruent to angle DCA

Answer:

Total amount of water in the ice cube

Explanation:

The mass of an ice cube is the total amount of water in the ice cube. Ice is the solid form of water. Hope this answers the question. Have a nice day. Feel free to ask more questions.

Answer:

Stan Loona

Explanation:

Answer:

i dont feel like sending out my socials but if you can send me a picture of the problems on here i would be happy to help for free

Explanation:

i dont know if im going to be right about the questions but i can try

Answer:

change in size or shape

Explanation:

Answer: hey

Explanation:

Answer:

A

Explanation:

...

Answer:

not recycling can make a hole in the ozone layer

Explanation:

Recycling keeps the ozone layer safe but if we stop recycling then we could  burn a hole in the ozone layer and it could get even more hotter outside we might start sweating more often

Hope this helps ♡

Solar energy is the type of energy that warms earth surface. Details about solar energy can be found below.

Solar energy is the energy in the form of electromagnetic radiation emitted from the Sun.

Solar energy is especially that part of electromagnetic energy that is converted into usable thermal or electrical energy by man.

This energy from the sun warms the Earth surface and provides the heat needed for various activities.

Learn more about solar energy at: https://brainly.com/question/9704099

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Mass of CuSO₄.5H₂0 = 6.25 g (B)

MW CuSO₄.5H₂0 =250 g/ mol

mol of CuSO₄

[tex]\tt 0.25\times 0.1=0.025[/tex]

mass of CuSO₄ (MW=159.61 g/mol)

[tex]\tt 0.025\times 159.61=3.99~g[/tex]

[tex]\tt mass~CuSO_4=\dfrac{159.61}{250}\times mass~CuSO_4.5H_2O\\\\mass~CuSO_4.5H_2O=\dfrac{3.99\times 250}{159.61}=6.25~g[/tex]

Answer:

The answer is D

Explanation:

I recently took a test with the same question and it said the answer was correct

I hope this helps and have a nice day <3

Answer:

WOWOWWOWOOWOWOWOW

Explanation:

Answer:

b. Charge is the main difference

Explanation:

This is a theory question which you just need to understand and remember the concepts.

Protons and neutrons are relatively the same sizes.

The charges here are defined, protons are positively charged and neutrons have no charge (electrically neutral).

Both are located in the nucleus of an atom.

Proton radiation rarely occurs and neutron radiation is a form of ionizing radiation in cases typically of nuclear fission or nuclear fusion.

The most likely answer is that the charge is the main difference. This is also a basic concept so this would be the answer.

Answer:

1.327 g Ag₂CrO₄

Explanation:

The reaction that takes place is:

First we need to identify the limiting reactant:

We have:

If 4 mmol of K₂CrO₄ were to react completely, it would require (4*2) 8 mmol of AgNO₃. There's more than 8 mmol of AgNO₃ so AgNO₃ is the excess reactant. That makes K₂CrO₄ the limiting reactant.

Now we calculate the mass of Ag₂CrO₄ formed, using the limiting reactant:

Answer:

=16.00 g/mole

Explanation:Oxygen’s atomic weight is 16.00 amu.

1 mole of oxygen is 6.02 x 1023 atoms of oxygen

1 amu = 1.661 x 10-24g

What is the molar mass (g/mole) of oxygen?

16.00 amu/oxygen atom x 1.661 x 10-24g/amu

= 2.657 x 10-24 g/atom x 6.02 x 1023 atoms/mole

=16.00 g/mole

Molar mass (in grams) is always equal to the atomic weight

Answer:

Volume of NCl3 is 3L

Explanation:

Avogadro states: All gases at the same volume under temperature and pressure constant have the same number of moles.

The chemical equation is:

3Cl2(g) + N2(g) → 2NCl3(g)

Where 3 moles of chlorine reacts with 1 mole of nitrogen to produce 2 moles of NCl3.

But using Avogadros law we can say:

3L of chlorine and 1L of nitrogen produce 2L of Nitrogen trichloride.

3L of chlorine and 1L of nitrogen: 4L (The stoichiometric mixture)

That means, volume of NCl3 produced is 3L

Answer:

Explanation:

An oxidation reaction has the following properties;

The reduction reaction is the opposite of the points mentioned above;

1. Occurs when atoms gain electrons during bonding: Reduction

2.  Occurs when the oxidation number of an element decreases in chemical reaction: Reduction

3.  Occurs when atoms lose electrons during bonding: Oxidation

4.  F + e- ----> F-  : Reduction

5.  Occurs when the oxidation number of an element increases in chemical reaction: Oxidation

6.  2I- ----> I2 + 2e- : Oxidation

Answer:

The final pressure is 0.788 atm (option b).

Explanation:

Boyle's law says that the volume occupied by a given gaseous mass at constant temperature is inversely proportional to pressure. That is: if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases. This is expressed mathematically as the product of pressure times volume equal to a constant value:

P*V=k

Assuming a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment, by varying the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1*V1=P2*V2

In this case:

Replacing:

2.14 atm*3 L= P2* 8.15 L

Solving:

[tex]\frac{2.14 atm*3 L}{8.15 L} =P2[/tex]

0.788 atm= P2

The final pressure is 0.788 atm (option b).

Answer:

When something crashes it affects the motion of an object because what it crashed into had force going in the opposite direction.

Explanation:

Answer:

(Mechanism in attachment).

Explanation:

The Williamson ether synthesis is the most used method to form ethers, in which an alkoxide ion reacts with a primary alkyl halide in an SN₂ reaction. Usually, the alkoxide ion is prepared by the reaction of an alcohol with a strong base like sodium hydride, NaH.

The alkyl halide must be primary so an attack by the backside is not impeded. When the alkyl halide is not primary, the result is usually an elimination.

Mechanism

Step 1: form the alkoxide of the alcohol considering the most impeded group (in this case, the 4-methoxyphenol).

Step 2: the alkoxide displaces the leaving group from a good SN₂  substrate (the propyl bromide).

Therefore, in Williamson ether synthesis, the alkyl halide must be a good SN₂ substrate (generally primary). We choose the alkyl group less impeded to be the halide and the most impeded group to be the alkoxide ion.

Answer:To determine the weight of the asphalt needed, first determine the area of the surface to be paved.

Since the shape of the road is a rectangle, use the formula of area of rectangle.

A = Length xx Width

Before plugging-in the values, convert the 2.5 miles to feet in order that the dimension to have same unit.

So,

2.5 mi xx (5280 ft)/(1mi) = 13200ft

Now that the length is in feet, plug-in the values of dimension of the road to the formula of area of rectangle.

A=13200*24

A=316800

Hence, the area to be paved is 316 800 ft^2 .

Next, determine the volume. Use the formula:

V = Area xx thickness

Before substituting the values, convert the thickness to feet in order to have same units.

So,

3 i n xx (1ft)/(12 i n)=0.25ft

Then, substitute the values of the area and thickness to the formula of volume.

V=316800*0.25=79200

Thus, the volume of the asphalt needed is 79200 ft^3.

Next, to determine its weight , multiply that with the given density 1479 pounds per cubic feet (1479 lb/ft^3).

W=79200*1479=117136800

So, the weight is 11 7136 800 lbs.

Then, convert it to tons.

117136800 lbs xx (1t o n)/(2000lbs) = 58568.4 t o n s

Explanation:i did the math

Answer:

Biochemistry or biological chemistry, is the study of chemical processes within and relating to living organisms

Explanation:

Answer:

10

Explanation:

You take the atomic number and subtract it from the atomic mass. So in this case it would be 29-19 thus giving us 10.

Answer:

compounds, atomic compounds

Answer:

CO - carbon monoxide and CO2 - carbon dioxide are often confused. The names sound the same, they both are colorless and odorless gases, and at high concentrations, both can be deadly. The difference is that CO2 is a common, naturally occurring gas required for all plant and animal life. CO is not common.

Explanation:

Answer:

F₂

Explanation:

Let the R₁ represent the rate of diffusion of Cl₂

Let R₂ represent the rate of diffusion of the gas.

Let M₁ represent the molar mass of Cl₂

Let M₂ represent the molar mass of the gas.

From the question given above, the following data were obtained:

NOTE: Assume the rate of diffusion of Cl₂ is 1.

Rate of diffusion of Cl₂ (R₁) = 1

Rate of diffusion of the gas (R₂) = 1.37 times R1 = 1.37 × 1 = 1.37

Next, we shall determine the molar mass of the gas. This can be obtained as follow:

Rate of diffusion of Cl₂ (R₁) = 1

Molar mass of Cl₂ (M₁) = 35.5 × 2 = 71 g/mol

Rate of diffusion of the gas (R₂) = 1.37

Molar mass of the gas (M₂) =?

R₁/R₂ = √(M₂/M₁)

1/1.37 = √(M₂/71)

Square both side

(1/1.37)² = M₂ /71

1/1.8769 = M₂ /71

Cross multiply

1.8769 × M₂ = 71

Divide both side by 1.8769

M₂ = 71 / 1.8769

M₂ = 37.8 g/mol

Since the gas is a homonuclear (the same element) diatomic molecule, we shall divide the molar mass of the gas molecule by 2 to obtain the molar mass of the element that makes up the molecule. This is illustrated below:

Molar mass of the element = 37.8 / 2

Molar mass of the element = 18.9 g/mol

Comparing the molar mass of the element with those in the periodic table, the element that makes up the gas is fluorine. Thus the molecular formula of the gas F₂.

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Answer:

ok so u take 90-20 for the is where the miniscus is at and u get 70 then count the number of spaces between 70 and 80 and then take that and subtract 70 and 20 to get  50 and i think thats ur answer.

I HOPE THIS IS HELPFUL!!!

Statement 1: False

Statement 2: True

Statement 3: True

Statement 4: False

Statement 5: False

Statement 6: True