How many total electrons are transferred in the redox reaction?
Al (s) + Cr(NO3)2 (aq) – Cr (s) + Al(NO3)3 (aq)

A. 2
B. 3
C. 5
D. 6

Answer:

The generic equation for a combustion reaction is AB + O2 à AO + BO

Explanation:

Answer:

The specific heat of the substance is 1.21 [tex]\frac{J}{g*C}[/tex]

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c*m*ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

1108 J= c*83 g* 11 C

Solving:

[tex]c=\frac{1108 J}{83 g* 11 C}[/tex]

c= 1.21 [tex]\frac{J}{g*C}[/tex]

The specific heat of the substance is 1.21 [tex]\frac{J}{g*C}[/tex]

Answer:

7

Explanation:

Answer:

Positive acceleration involves speeding up, while negative acceleration involves slowing down.

Explanation:

I am so sorry if I was wrong!

Answer:

no just no

Explanation:

Answer:

False

Explanation:

Humans and plans do it as well

Answer:

False

Explanation:

Cellular respiration takes place in the cells of all organisms. It occurs in autotrophs such as plants as well as heterotrophs such as animals.

Answer:

A

Explanation:

Biology is the study of living things.

Answer:

62.50

Explanation:

I divided the 125 in the result is 62.50 but it is considered a 62.

never mine:)

[tex]125gms[/tex] of oxygen gas contains [tex]2.35\times 10^{24}[/tex] molecules of oxygen.

The molecular weight of oxygen[tex]=16[/tex]

Therefore,[tex]O_2=2\times 16\\=32[/tex]

No.of Moles of oxygen in 125g is,

[tex]\frac{125}{32}=3.9 g[/tex]

1mole of oxygen contains [tex]6.023\times10^23 molecules[/tex]

No.of oxygen molecules in 3.9 g of oxygen is,

[tex]3.9 \times 6.023 \times10^23=2.348 \times 10^24[/tex]

Which can be roundoff and written as [tex]2.35 \times10^{24}[/tex]

Therefore, 125gms of oxygen gas contains [tex]2.35 \times10^{24}[/tex] molecules of oxygen.

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The percentage of fluorine in the given compound is 49%.

The given compound;

CaF₂

The molecular mass of the given compound is calculated as follows;

CaF₂ = (40) + (19 x 2)

        =   40  +  38  

        =  78 g/mol

The mass of fluorine in the given compound = 38 g/mol

The percentage of fluorine in the given compound is calculated as follows;

[tex]= \frac{38}{78} \times 100\%\\\\= 48.7 \%\\\\\approx 49\%[/tex]

Thus, the percentage of fluorine in the given compound is 49%.

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Answer:

Explained below.

Explanation:

- Redox reaction is defined as any type of chemical reaction whereby the oxidation number of a participating chemical atoms/elements undergo changes.

- The atom that is oxidized is the one that has an increase in it's oxidation number.

- The atom that is reduced is the one that has a decrease in its oxidation number.

- The reducing agent is defined as the atom that is oxidized.

- The oxidizing agent is defined as the atom that is reduced.

Answer:

The application of reflection in the use of the microscopes.

Explanation:

Reflection is one of the properties of light. Reflection is a phenomenon whereby light waves hitting a surface is bounced off. Reflection helps us to see light and colors. This behavior of light is harnessed in the design of the microscope.

The light reflected by the microscope helps the researcher to view the specimen in his slide. Also, the mirrors placed in measuring devices reflects light that helps an observer to take an accurate reading.  

Answer:

it's a double displacement reaction

Explanation:

Answer:

316.08g

How many moles Al2O3 in 1 grams? The answer is 0.0098076450122103. We assume you are converting between moles Al2O3 and gram. You can view more details on each measurement unit: molecular weight of Al2O3 or grams This compound is also known as Aluminium Oxide. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Al2O3, or 101.961276 grams. Note that rounding errors may occur, so always check the results.

Answer: D

Explanation:

Weight by definition is mass multiplied by the acceleration of gravity. So, weight is the force of gravity

Answer: The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic, in which

Explanation:

Answer:

The four main categories of mineral formation are: (1) igneous, or magmatic, in which minerals crystallize from a melt, (2) sedimentary, in which minerals are the result of sedimentation, a process whose raw materials are particles from other rocks that have undergone weathering or erosion, (3) metamorphic.

Answer:

on your own?

Explanation:

it sticks better in your head once you fail

im sorry i dont know this i really need points for my maths test

Answer:

It depends on the situation. Most things are better learning from others because others can see what you cant. On the other hand there are some situations were only you can learn from. Take pain as an example. Others can talk about pain as much as they would like but your body dosent know what that feels like unless it feels it on its own and learns from it. An example of learning from others would be smarts such as math, science, history and so forth.

Explanation:

Answer:

team 25 N because the force is more

Answer:

I would say C and D

Explanation:

Hope this helps my good friend :)

According to the forces of attraction, the phase changes that occur at the same temperature are vaporization and condensation, melting and vaporization ​.

Forces of attraction is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:

a.-137.2 kJ

Explanation:

If the first example symbol used is addition you can copy the plus and follow it how to solve the next!And also if the negative or positive sign.

Answer: the overuse of resources will lead to a decline of the resources, the question was a little non specific so this was the best I could do :)

Explanation:

Answer: sand, silt, and clay.

Answer:

B. When energy changes form one to another.

Explanation:

Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work or provides heat.

Answer:

atom 1 and atom 2

Explanation:

Answer:

The average speed is 553.27[tex]\frac{km}{hour}[/tex]

Explanation:

Speed is the physical magnitude that shows and expresses the variation in position of an object and as a function of time. In other words, the speed relates the distance traveled by an object in the unit of time.

The average speed is the quotient of the space traveled by an object and the time it takes to cover the path:

[tex]speed=\frac{distance}{time}[/tex]

In this case:

So, replacing in the definition of speed:

[tex]speed=\frac{3,043 km}{5.5 hours}[/tex]

Solving:

speed= 553.27[tex]\frac{km}{hour}[/tex]

The average speed is 553.27[tex]\frac{km}{hour}[/tex]

Answer:

Kidneys •_•

Hope this helped <3

Answer:

I cant help you because you didn't provide a picture for the graph

Explanation:

Answer:

butane

Explanation:

Answer: 410

Explanation:

Drop the retaining numbers 1 and 2 after the decimal and then round the 2 in 412 to 0 because any number less than 5 rounds to 0. 0 shouldn’t count as a sig fig.

This problem is providing the mass of salt, 15 g, that is dissolved in 100 mL of water, so its concentration is required and found to be 15 % according to the following calculations:

In chemistry, units of concentration in solutions are used to represent the relative amount of a solute that is dissolved in a solvent. Thus, in this case, we refer to a salt-water solution, whose concentration is calculated via:

[tex]\% m=\frac{m_{salt}}{m_{water}}*100\%[/tex]

In such a way, given the mass of salt, 15 g and volume of water, or solution, 100 mL, one obtains the following:

[tex]\% m=\frac{15g}{100g}*100\% \\\\\% m=15\%[/tex]

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Answer:

D) 15%

Explanation