WILL MARK AS BRAINLIEST! PLEASE HELP

Identify the oxidation number of a Cr atom
in each of the following: CrO3, Cro, Cr(s),
CrO2, Cr2O3, Cr2O3 , and Cro2-7, and Cro2-4

Answer:

by eating a food item with carbon in it? sorry if im wrong.

Answer:

graduated cylinder

Explanation:

It shows exact volume very precisely.

Answer:

electron in physics , and Element in chemistry.

Answer:

The new volume of the balloon be [tex]462\ cm^3[/tex].

Explanation:

We have,

Initial volume is 556 cm ³

The temperature of the balloon decreases from 278 K to 231 K.

We need to find the new volume of the balloon if the pressure is constant.

The Charles law states that at constant pressure, the volume of gas is directly proportional to its temperature i.e.

[tex]V\propto T[/tex], P is constant

[tex]\dfrac{V_1}{V_2}=\dfrac{T_1}{T_2}[/tex]

[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{556\times 231}{278}\\\\V_2=462\ cm^3[/tex]

So, the new volume of the balloon be [tex]462\ cm^3[/tex].

Answer:

Explanation:

I believe u should use a thermometer coz its better and u will be able to find the temperature more accurately!!

Answer

safety

Explanation:

you have to be safe when dealing with chemicals

Answer:

it gets euthanized. or it gets put down

Answer:

Butanoic acid

Explanation:

Answer:

The increase in algae could be related to Sarah's farm due to her use of fertilizer to grow her crops Fertilizers contain high amount of nitrogen and help produce strong, healthy crops but they can also wash into lakes and rivers. It is however likely that the lake contains some of the fertilizer from Sarah's farm.

Sample response : The increase in algae could be related to Sarah’s farm due to her use of fertilizer. Fertilizers help produce strong, healthy crops, but they can also wash into lakes and rivers. When they do, they provide a large food supply for the algae living there, which can cause the algae population to increase dramatically. Samples from the neighborhood lake show high levels of phosphorus and nitrogen, the key ingredients of most fertilizers, and a large increase in the algae population. It is therefore likely that the lake contains some of the fertilizer from Sarah’s farm.

Explanation:

well if you arent doing it on edge then good luck ;)

Answer:

[tex]Q=-76.7kJ[/tex]

Explanation:

Hello,

In this case, for such formation of sulfur hexafluoride, the standard enthalpy of formation is -1220.47 kJ/mol (data extracted from NIST database). Next, we compute the moles in 10.0 grams of sulfur hexafluoride as shown below:

[tex]n_{SF_6}=10.0gSF_6*\frac{1molSF_6}{146.06 gSF_6}=0.0685mol[/tex]

Next, for the given energy, we compute the total heat that is liberated:

[tex]Q=-1220.47\frac{kJ}{mol}*0.0685 mol\\\\Q=-76.7kJ[/tex]

Finally, we conclude such symbol has sense since negative heat is related with liberated heat.

Best regards.

Answer:

83.5 kJ

Explanation:

Molar mass is 146.053. Moles of 10.0 g = 0.0685 mol. Multiply by 1220 kJ/mol for the answer of 83.5 kJ.

Answer:

.300M

Explanation:

It is necessary for us to remember that increasing the reactant concentration increases the rate of reaction. This is because reactant concentration is one of the most important factors that affects the rate of reaction.

Reactant concentration affects the rate of reaction because according to collision theory, chemical reaction results from effective collisions between reactants. Hence, if there are more reactants in the system, there are greater chances of effective collisions between the reactants.

Since 0.300M is a higher concentration than 0.2000M, the rate of reaction will increase when a 0.3000M solution is used.

Answer:

Explanation:

physical change

Answer: There are [tex]1.415\times 10^{23}[/tex] molecules in 25.4 g of [tex]N_2O_5[/tex]

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{25.4g}{108g/mol}=0.235moles[/tex]

1 mole of [tex]N_2O_5[/tex] contains =  [tex]6.023\times 10^{23}[/tex] molecules

Thus 0.235 moles of [tex]N_2O_5[/tex] contains = [tex]\frac{6.023\times 10^{23}}{1}\times 0.235=1.415\times 10^{23}[/tex] molecules.

There are [tex]1.415\times 10^{23}[/tex] molecules in 25.4 g of [tex]N_2O_5[/tex]

Answer:

During the equinoxes every location on our Earth (except the extreme poles) experiences 12 hours of daylight and 12 hours of darkness. The vernal or spring equinox occurs in the northern hemisphere on March 21 or 22 (the fall equinox of the southern hemisphere).

Explanation:

Answer:

I think it would be Scientific Method.

Answer:

2nd option

Explanation:

Answer:

planet A

Explanation:

because it doesn’t have to go as far when it orbits

Answer:

1.555 moles

Explanation:

Mass of sulfuric acid is 98.079g/mol

One liter of 0.954 solution has 0.954 mols

1.63 liters will have 0.954x1.63 = 1.555moles

Answer:

Here's a quick conversion before I answer your question, use it whenever needed.

1 moles Copper to grams = 63.546 grams. 2 moles Copper to grams = 127.092 grams. 3 moles Copper to grams = 190.638 grams. 4 moles Copper to grams = 254.184 grams. 5 moles Copper to grams = 317.73 grams. 6 moles Copper to grams = 381.276 grams. 7 moles Copper to grams = 444.822 grams.

Ok, now I'll answer your question.

Atomic masses are given in atomic mass units. One atomic mass unit is equal to one gram per mole. When you add these together for a compound, you get the molar mass of that compound. For example, silicon dioxide consists of one silicon atom and two oxygen atoms. The atomic mass of silicon is 28 grams and the atomic mass of oxygen is 16 grams.

(Hope the conversion and the answer helped) Sky

Answer:

Scale Factor: 1 : 2

X = 11

Explanation:

3 / 3 = 1

6 / 3 = 2

The scale factor should be 1:2

So 'X' should be 11 since 5.5 * 2 = 11

Answer:

a light year is the distance light travels in one year. 6 trillion miles!!

Explanation:

Answer:

4000 L

Explanation:

Step 1:

Data obtained from the question. This include the following:

Initial volume (V1) = 2000 L.

Initial temperature (T1) = 100 K.

Initial pressure (P1) = 100 kPa.

Final temperature (T2) = 400 K.

Final pressure (P2) = 200 kPa.

Final volume (V2) =..?

Step 2:

Determination of the new volume of the gas.

The new volume of the gas can be obtained by using the general gas equation as follow:

P1V1/T1 = P2V2/T2

100 x 2000/100 = 200 x V2/400

Cross multiply to express in linear form.

100 x 200 x V2 = 100 x 2000 x 400

Divide both side by 100 x 200

V2 = (100 x 2000 x 400)/(100 x 200)

V2 = 4000 L

Therefore, the new volume of the gas is 4000 L

Answer:

the third option

Explanation:

The circuit is incomplete and broken, and the lights in the circuit do not shine.

An open circuit means an incomplete circuit.

The first option is wrong since the lights do not shine in an open circuit.

The second option is wrong since an open circuit is incomplete.

The fourth option is also wrong since an open circuit is broken or incomplete.

∴ The third option is correct.

Answer: C. The circuit is incomplete and broken, and the lights in the circuit do not shine.

Answer: [tex]5.1\times 10^{-6}M[/tex]

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

[tex]pH=-\log [H^+][/tex]

[tex]pH+pOH=14[/tex]

Putting in the values:

[tex]pH=14-8.71=5.29[/tex]

[tex]5.29=-log[H^+][/tex]

[tex][H^+]=5.1\times 10^{-6}[/tex]

Thus [tex][H^+][/tex] is [tex]5.1\times 10^{-6}M[/tex]

Answer:

A. the ration is 2 to 3, 2Al + 3H2SO4 has the same balance as 18Al + 3H2SO4

2/3 = 18/27

B. Doesn't need an explanation other than the work you did to balance it.

The moles of sulfuric acid reacted with the reaction has been 27 moles. The moles of hydrogen produce is 27 mol, and aluminum sulfate is 9 mol.

The moles of reactant reacted in the reaction, and the moles of product produced, can be given by the stoichiometric law.

According to the stoichiometric law, the moles of product produces, and the reactant reacted is given by the stoichiometric coefficient.

[tex]\rm 2\; mol\;Al=3\;mol\;H_2SO_4\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2SO_4\\\\ 18\;mol\;Al\;=27\;mol\;H_2SO_4[/tex]

Thus, the moles of sulfuric acid reacted in the reaction are 27 moles.

[tex]\rm 2\;mol\;Al=1\;mol\;Al_2(SO_4)_3\\\\18\;mol\;Al=\dfrac{1}{2}\;\times\;18\;mol\;Al_2(SO_4)_3\\\\ 18\;mol\;Al=9\;mol\;Al_2(SO_4)_3[/tex]

The moles of aluminum sulfate produced in the reaction are 9 moles.

The moles of hydrogen produced from 2 moles of Al are 3 moles. the moles of hydrogen produced from 18 mol Al has been:

[tex]\rm 2\; mol\;Al=3\;mol\;H_2\\\\18\;mol\;Al=\dfrac{3}{2}\;\times\;18\;mol\;H_2\\\\ 18\;mol\;Al\;=27\;mol\;H_2[/tex]

The moles of hydrogen produced in the reaction are 27 moles.

Learn more about moles produced, here:

https://brainly.com/question/10606802

Answer: The molarity of solution is 0.231 M

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

[tex]Molarity=\frac{n}{V_s}[/tex]

where,

n = moles of solute

[tex]V_s[/tex] = volume of solution in L

Molar mass of [tex]Na_2CO_3[/tex] = [tex]2\times 22.99+1\times 12.01+3\times 16.00=105.99[/tex]

moles of [tex]Na_2CO_3[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{49.0g}{105.99g/mol}=0.462mol[/tex]

Now put all the given values in the formula of molality, we get

[tex]Molarity=\frac{0.462mol}{2.00L}[/tex]

[tex]Molarity=0.231M[/tex]

Therefore, the molarity of solution is 0.231 M

Answer:

I believe it is an Alkane

Explanation:

Answer:

C4H110+ C12--> C4H9CI+HCI: substitutions