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Answer:

Acid solutions will be those which lights up a bulb when a circuit is connected through them.

Explanation:

Acid solutions such as HCl and HNO3 are polar in nature and permits the flow of electricity through them. Whereas non-polar solutions like ethanol and glucose solution will not allow the flow of electricity through them.

Therefore, when an electric circuit is completed by dipping the nails connected to a battery and a bulb into the different solutions, the lighting up of the bulb indicates which solutions are acids.

Answer:

As they move away from each other the force makes it leave a gap between them. And the convection currents push up a lot of magma towards the surface. The magma cools of very quickly in the water. Forming rocks constantly, rocks that little by little start to make a big mass, that eventually turns into an underwater mountain, or rather a mid-ocean ridge.

(Hope this helps) Sky

Answer:

a. overuse of resources is the correct answer.

Explanation:

Renewable resources are available and they are abundant but overuse of these renewable resources will have a negative effect on the surroundings and humans.

Overuse of renewable resources will leads to the depletion of these renewable sources in the future and will also make the ecosystem unbalance.

Renewable resources are solar energy, geothermal energy, biomass energy, wind energy, hydro energy.

Thus renewable resources are threatened due to overuse and it must be carefully used.

Answer:

i think that the answer should be option D as the mole value is also greatest

Answer:

i think its a

Explanation:

nucleic acids are dna and rna

amino acids are the 4 nuecleotides in dna or rna

Answer:

amino acids i think

Explanation:

It means that in any interaction where external impulses don't occur, the momentum of the system remains the same before and after the interaction. When a cannonball is fired, its momentum does change.

Answer:

Option 2

Explanation:

There are many ways to do it. You can also just use your scientific calculator to directly get the answer. But now I'm going to solve the equation by factoring.

8x² + 40x = 0

Factor out 8x from the expression

8x ( x + 5 ) = 0

Divide both sides by 8

8x ( x + 5 ) ÷8 = 0 ÷8

x ( x + 5 ) = 0

Now we have two factors, x & x+5. Set each factors equal to zero

x = 0

x + 5 = 0

Now solve the equation

x = 0

x = -5

Then you get the answer!

Answer:

Explanation:

pressure of dry nitrogen gas at 20° = Partial pressure of nitrogen and partial pressure of water at that temperature .

The pressure of dry nitrogen gas= total pressure - vapour pressure of water at 20°C

= 200 k Pa - 2.34 k Pa

= 197.66 kPa.

Answer:

1.2cm

97.8mm

7cm

Answer:

[tex]M = 13.714\,\frac{mol}{L}[/tex]

Explanation:

The molarity is the ratio of moles solute to volume of solution. Then,

[tex]M = \frac{2.4\,mol}{\left(175\,mL\right)\cdot \left(\frac{1}{1000}\,\frac{L}{mL} \right)}[/tex]

[tex]M = 13.714\,\frac{mol}{L}[/tex]

Answer:

[tex]M=13.7\frac{mol}{L}=13.7M[/tex]

Explanation:

Hello,

In this case, we define the molar concentration or widely known as molarity as the ratio of the moles of the solute to the volume of the solution in litres. Thus, for the computation of the molar concentration we make sure we have litres:

[tex]V_{solution}=175mL*\frac{1L}{1000mL} =0.175L[/tex]

Next, we can compute the molarity in mole per litre or just molar units by:

[tex]M=\frac{n_{solute}}{V_{solution}} =\frac{2.4mol}{0.175L} \\\\M=13.7\frac{mol}{L}=13.7M[/tex]

Best regards.

Answer:

call an vet ASAP 10 pounds of chocolate is very bad for a dog.

Explanation:

Chocolate is one of the worst things a dog can eat, and 10 pounds of it is worst! Take your dog to the vet IMMEDIATELY! I hope that that the dog will survive.

-------------------------------------------------------------------------------------------------------------Brainiest would make my day, but you don’t have to give it! You’re welcome.

Answer:

 Translation:

Classify the following elements into metals, nonmetals, metalloids, or gases, noble : fluorine, sulfur, nitrogen, chlorine, magnesium, helium, sodium, bromine, silicon, tellurium.

Explanation:

Metals: They occupy the left and central areas of the Periodic Table; therefore, they constitute a majority group of the elements.

Nonmetals: They are located in the upper right region of the Periodic Table.

Within the Periodic Table, the metalloids lie diagonally from boron to polonium. Items above on the right are nonmetals, and items below on the left are metals.

The noble gases are located in group 18 of the Periodic Table.

Answer:

fluorine: it is a gas at room temperature

sulfur: it is a metal

nitrogen: it is a diatomic gas

chlorine: it is a halogen

helium: it is a gas

sodium: alkali metal

magnesium: metal

bromine: halogen

silicon: metalloid

tellurium: it is a semi-metal

Explanation:

the grouping of the chemical compounds respect a location in the periodic table, and this classification exists since all the compounds have different behaviors, different melting and boiling temperatures and even different valence, oxidation, atomic masses.

Answer:

P = 2.145kPa

Explanation:

Mass = 22.1g

Molar mass of CO2 = 44g/mol

Vol = 165mL = 0.165L

T = -188°C = (-188 + 273.15)K = 85.15K

R = 8.314J/mol.K

From ideal gas equation,

PV = nRT

P = pressure of the ideal gas

V = volume the gas occupies

n = number of moles if the gas

R = ideal gas constant

T = temperature of the gas

n = number of moles

n = mass / molar mass

n = 22.1 / 44 = 0.50moles

PV = nRT

P = nRT/ V

P = (0.5 × 8.314 × 85.15) / 0.165

P = 2145.26Pa = 2.145kPa

Pressure of the gas is 2.145kPa

Answer:

Explanation:

Alexander Fleming's hypothesis was that the juice that was produced by the mold that appeared in the petri dishes was killing the bacteria growing there (streptococcus, meningococcus and the diphtheria bacillus).

Answer:

He thought the mold had released a chemical that prevented the bacteria’s growth.

Explanation:

Gradpoint

Answer:

4.22

Explanation:

pH stands for potential hydrogen. The letter “p” denotes potential and the letter “H” denotes hydrogen.

pH helps to find the acidity or alkalinity of an aqueous solution.

The number of hydrogen ions (protons) present in a solution is determined by the pH scale.

A pH greater than 7 makes the water more alkaline and a pH less than 7 makes the water more acidic.

[tex]pH=-\log [H^+]=-\log [0.00006]=4.22[/tex]

Answer: hydrogen + oxygen Right arrow .water

Explanation:

The exact equation for this reaction is;

2H2  +  O2 ------------->   2H2O

hydrogen + oxygen Right arrow. water is the correct option.

The equation shows hydrogen reacting with oxygen to form water is as follows:-

[tex]2H_2+O_2\rightarrow2H_2O[/tex]

The above reaction in word form is written as follows:-

[tex]hydrogen+Oxygen \rightarrow water[/tex]

So, hydrogen + oxygen Right arrow. water is the correct option.

Hydrogen-H

Oxyden-O

Water-[tex]H_2O[/tex]

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Answer:

2.50 g N2 and the second one is 21.5 g N2

Explanation:

just answered it and it was correct

Answer:

b

Explanation:

Ethyne  will contain the strongest bond between the two carbon atoms as  the triple bonds are the strongest.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Yes, igneous rock become sedimentary rock through a process called sedimentation.

In sedimentation, An igneous rock is broken down or crushed into little piece of rock called sediment, the sediment is then packed together as a result of othe rocks or strong forces, that form together to make a Sedimentary rock.

Conclusively, The process of erosion, heat and depositing rock grains which can also be known as sedimentation can alter or change igneous rock into sedimentary rock.

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Answer:

Fishes undergo both asexual and sexual mode of reproduction with majority of fishes reproducing by sexual mode

Explanation:

Fishes undergo sexual reproduction. The sperm from the male fuses with the eggs of females. Some of the fishes have separate female and male sexes while some are hermaphrodites and have both testes and ovaries. Some species of fishes reproduce through parthenogenesis in which female egg develops into baby fishes without fusing with a sperm cell. Due to this, the offspring are exact copies of their mothers

Answer:

what?

Explanation:

whats the answer

Answer:

oh yea! keep up the great work buddy!!

Answer:

The H+ (aq) concentration of the resulting solution is 4.1 mol/dm³

(Option C)

Explanation:

Given;

concentration of HA, [tex]C_A[/tex] = 6.0mol/dm³

volume of HA, [tex]V_A[/tex]  = 25.0cm³, = 0.025dm³

Concentration of HB, [tex]C_B[/tex] = 3.0mol/dm³

volume of HB, [tex]V_B[/tex] = 45.0cm³ = 0.045dm³

To determine the H+ (aq) concentration in mol/dm³ in the resulting solution, we apply concentration formula;

[tex]C_iVi = C_fV_f[/tex]

where;

[tex]C_i[/tex] is initial concentration

[tex]V_i[/tex] is initial volume

[tex]C_f[/tex] is final concentration of the solution

[tex]V_f[/tex] is final volume of the solution

[tex]C_iV_i = C_fV_f\\\\Based \ on \ this\ question, we \ can \ apply\ the \ formula\ as;\\\\C_A_iV_A_i + C_B_iV_B_i = C_fV_f\\\\C_A_iV_A_i + C_B_iV_B_i = C_f(V_A_i\ +V_B_i)\\\\6*0.025 \ + 3*0.045 = C_f(0.025 + 0.045)\\\\0.285 = C_f(0.07)\\\\C_f = \frac{0.285}{0.07} = 4.07 = 4.1 \ mol/dm^3[/tex]

Therefore, the H+ (aq) concentration of the resulting solution is 4.1 mol/dm³

Answer:

950mL

Explanation:

The following were Data were obtained from the question:

Initial volume (V1) = 100mL

Initial pressure (P1) = stp = 760mmHg

Final pressure (P2) = 80mmHg

Final volume (V2) =..?

The final volume of the gas can be obtained by using the Boyle's law equation as follow:

P1V1 = P2V2

760 x 100 = 80 x V2

Divide both side by 80

V2 = (760 x 100) /80

V2 = 950mL

Therefore, the new volume of the gas is 950mL

Answer:

Ty for free points :)

Explanation:

Explanation:

The molecules of solids are shrinked in there normal state . but as a heat energy is produced , the molecules starts curating fast and fast as temperature goes up . since they vibrate , they hit and collide each other breaking the bondings this increases the surface of area of the solid , and molecules consumes that space and they expand .

Answer:

The concentration of the resulting solution is 0.25 or one quarter of the standard solution

Explanation:

Whereby the molar concentration of the standard solution is P molar per liter, we have

25 ml of the standard solution contains

25/1000×P moles of the standard solution such that the resultant solution has a volume of 25 + 75 = 100 ml contains 0.025 P moles of the standard solution

The concentration of a solution is the number of moles contained per liter, which gives

100 ml contains 0.025 P moles

1 liter = 1000 ml will contain 1000/100 × 0.025 = 0.25 P moles of the stanard solution

Therefore, the concentration of the resulting solution is 0.25 or one quarter of the standard solution.

Answer: The answer is D. Elements that share the same column

Explanation:

The elements occupying the same groups are sharing the same column. They have similar chemical and physical properties. Elements of the same group have the same number of valence electrons.

All elements are classified to different groups and periods. The horizontal rows in the table is called periods and the vertical column are called groups in periodic table.

There are 18 groups and 7 periods in periodic table. The atomic number increases from left to right along a period. Elements in a group are having same number of valence electrons and are having similar chemical and physical properties.

Elements in a groups shows similarity in reactivity and physical properties.  They show same trend in increasing or decreasing nature of physical quantities. A group is thus, representing a column in periodic table.  Therefore, option D is correct.

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