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Answer:

he molar mass is defined as the mass in grams of 1 mol of that substance. One mole of isotopically pure carbon-12 has a mass of 12 g

Explanation:

Answer:

When 20.0 grams of aluminum and 30.0 grams of chlorine are reacted according to the above equation, the chlorine is the limiting reactant and the maximum yield of aluminum chloride is 0.28 moles or 37.33 grams.

a. Gas A has the lowest rate of diffusion

Given

The molar masses

Required

the lowest rate of diffusion

Solution

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or  

the effusion rates of two gases = the square root of the inverse of their molar masses:  

[tex]\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }[/tex]

So  :

[tex]\tt r\approx \dfrac{1}{\sqrt{M} }[/tex]

The greater the molar mass, the smaller the rate

So gas A has the lowest rate

Answer:

Decrease temperature with increase in ammonium nitrate concentration.

Explanation:

The temperature changes when  different masses of ammonium nitrate are dissolved in water because the ammonium nitrate takes energy from the surrounding water environment for the breaking of ionic bonds as a result the temperature of water decreases. When more concentration of ammonium nitrate is added to water, more decrease occur in temperature of water and the water becomes cold.

Hotness or a cold state of a substance or a solution is measured physically by temperature. It is measured by a device called a thermometer and can be in the form of Kelvin, degree Celsius or degree Fahrenheit.

Decreasing the temperature with an upsurge in the ammonium nitrate concentration can be used in determining the change in the temperature.

Therefore, increased concentration reduce temperature.

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Answer:

Surface Water - water that collects on the surface of the ground. Hope it helped!

Answer:  surface water is when water is located of top of the Earth for example rivers, creeks, and wetlands.

Answer:

A

Explanation:

Atoms of elements can lose or gain electrons making them no longer neutral, they become charged. A charged atom is called an ion. When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons.

Answer:

7. isotonic

8. hypertonic

9. hypotonic

10. isotonic

11. hypotonic

12. hypertonic

Answer: Humans have increased the global temperature due to fossil fuel burning and are negatively contributing to the increase of CO2 emissions and greenhouse gases.

Explanation:

#1 Over the past century humans have negatively impacted the environment by increasing the global temperature due to fossil fuel emissions and a steady increase in the human population which has led to more resources being extracted and used.

#2 Human activities have brought a sudden increase in the global temperature recently due to the increase in greenhouse gas emissions from factories, automobiles, and homes. While we are beginning to use renewable resources, a large portion of our energy consumption still comes from the production and burning of fossil fuels.

#3 Some ways we can start to put a stop to global warming are by using renewable energy resources and decreasing the use of fossil fuel emissions. We can also decrease our carbon footprint by using electric powered vehicles and devices instead of petroleum burning automobiles and home appliances, and by riding bikes and walking over short distances.

Note: Please reword this a bit so you don't get in trouble for plagiarism.

According to the stoichiometry of the given chemical equation, 13.9939 grams of NaOH would be made with 8.0465 g of Na.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample. It is useful in balancing chemical equations and making solutions of different concentrations.As according to the given chemical equation 46 g sodium gives 80 g sodium hydroxide, thus,  8.0465 g of sodium will give 8.0465×80/46=13.9939 grams.

Thus, 13.9939 grams of NaOH would be made with 8.0465 g of Na.

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Answer:

C. Water has a greater density than alcohol.

Explanation:

From the experiment, it can be shown that water has a greater density than the alcohol.

The ice cube is able to float in the water because, the density of the ice is less than the density of the water.

 Density of ice < Density of water

So, the ice cube sinks in alcohol because the density of the ice cube is greater than the density of the alcohol.

 Density of ice > Density of alcohol

Therefore, we can assume that since the density of ice is greater than density of alcohol, then the density of water is greater than that of the alcohol.

Answer:

Compression

Explanation:

Hi! When two convergent plates collide, they should create compressive pressure, or compression.

Answer:

NA=72.264x1023

Explanation:

I got you

Answer:

Omodium

Explanation:

It’s Umodium

Answer:

Answer:

Nuclear Charge

Explanation:

As we move from sodium to chlorine across, there's increase in atomic number (protons). This also means there is increase in the valence electrons (The valence electrons is denoted by the group).

As the number of protons increases, the nuclear energy also increases. Due to this, the electrons are attracted more strongly and pulled closely to the nucleus.

Answer:

(D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway

Explanation:

A) a reaction in which the free energy at equilibrium is higher than the energy content at any point away from equilibrium

B) a chemical reaction in which the entropy change in the reaction is just balanced by an opposite entropy change in the cellʹs surroundings

C) an endergonic reaction in an active metabolic pathway where the energy for that reaction is supplied only by heat from the environment

D) a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway

E) no possibility of having chemical equilibrium in any living cell

The correct answer for a reaction that describes chemical equilibrium in a cell would be a chemical reaction in which both the reactants and products are not being produced or used in any active metabolic pathway .

A reaction in chemical equilibrium is a bi-directional reaction in which both the reactants and the products are present in a stoichiometrically balanced way within the system at a given period of time under specific conditions.

From the definition, a reaction would be in equilibrium if

The correct option is, therefore, D

Answer:

the total weight of matter is conserved.

Explanation:

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Answer:

Start with the temperature in Fahrenheit (e.g., 100 degrees).

Subtract 30 from this figure (e.g., 100 - 30 = 70).

Divide your answer by 2 (e.g., 70 / 2 = 35).

Answer:

Destructive

Explanation:

The heat absorbed to raise temperature : Q = 31350 J

Given

m = mass = 150 g

Δt = Temperature difference : 50 °C

Required

Heat absorbed

Solution

Heat can be formulated

Q = m.c.Δt

The specific heat of water = c = 4.18 J/g °C  

Input the value :

Q = 150 x 4.18 x 50

Q = 31350 J

Answer:

0.67mole

Explanation:

Given parameters:

Mass of potassium permanganate  = 105.66g

Unknown:

Number of moles  = ?

Solution:

To find the number of moles of the given compound;

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

Molar mass of KMnO₄   = 39 + 55 + 4(16) = 158g/mol

  Number of moles = [tex]\frac{105.66}{158}[/tex]   = 0.67mole

Answer:

Boron

Explanation:

The group III A is also known in the periodic table as group 13. The members of the group begin to appear in the second period.

At the beginning of this group III A is boron. Boron is a member of group III A as well as a member or period 2.

Boron is a metalloid and has only three valence electrons as other group III A elements.

Answer:

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Temperature does not change, remains 264 K

Given

V₁= 1.2 L

P₁ = 1.8 atm

T₁ = 264

Required

The new temperature

Solution

The volume was doubled = 2V₁ = 2 x 1.2 = 2.4 L(V2)

The pressure was halved = 0.5P₁ = 0.5 x 1.8 = 0.9 atm(P2)

Combined gas law :

P₁V₁/T₁=P₂V₂/T₂

Input the value :

[tex]\tt \dfrac{1.8\times 1.2}{264}=\dfrac{0.9\times 2.4}{T_2}\\\\T_2=264[/tex]

Answer:

b) Soil material being moved downstream carried by water

Explanation:

Erosion can be defined as a geological process which typically involves the wearing out of earthen (soil) materials and the transportation of these materials by natural forces like water, wind, etc. Soil erosion is greatest when the soil is steep.

The steepness of a body such as river or stream refers to the downward slope or gradient of the body of water.

Generally, the steepness of a body affects the rate at which other materials would flow or move around. Thus, the steeper a river or stream, the greater would be its rate of erosion.

An example of erosion in action is soil material being moved downstream carried by water.