3. What is the mass of an object with a density of 1.7 g/cm3 and a volume of 7 cm3?

4. What is the mass of an object with a density of 0.9 g/mL and a volume of 10 mL?

5. What is the volume of a substance with a density of 0.87 g/mL and a mass of 14 g?

6. What is the volume of an object with a density of 2.3 g/mL and a mass of 24 g?

Answer:

Option B. 71.4 amu

Explanation:

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

Isotope A:

Mass of A = 69.95 amu

Abundance (A%) = 25.7%

Isotope B:

Mass of B = 71.95 amu

Abundance (B%) = 74.3%

Average atomic mass =..?

The average atomic mass of the element can be obtained as shown below:

Average atomic mass = [(Mass of A × A%)/100)] + [(Mass of B × B%)/100)]

= [(69.95 × 25.7)/100] + [(71.95 × 74.3)/100]

= 17.977 + 53.459

= 71.436 ≈ 71.4 amu

Therefore, the average atomic mass of the element is 71.4 amu

Alma is using ATC-PC which is a quick fuel source. Which is the first energy used in short and quick uses of energy.  While it gives the max energy at first, after about 10 seconds it runs out. Which then short term energy starts. Which uses carbs as energy. This gets to max energy after a little bit and after a few minutes, it starts to run out. Then long term energy kicks in. This uses oxygen to provide energy, while it lasts for a long time, it takes time to reach max energy.  This can also fail if your respiratory system or cardiovascular system can't provide enough oxygen.

Answer:

[tex]\frac{250}{23}[/tex]

Step-by-step explanation:

I hope this helps!

Answer:

A).

ΔH is positive, Therefore reaction is endothermic

B).

ΔG = ΔH - T∙ΔS

= 98.4 kJ/mol - 300K ∙ 0.09564 kJ/molK

= 69.7 kJ/mol

C).

ΔG is positive, Therefore reaction is non-spontaneous

Explanation:

look i know that its not a drawing but its the best that i can do with what i have. i hope this helps!

Answer:

62.6 %

Explanation:

Pb(NO₃)₂  = 207 + 124 = 331 gram

331 gram of lead nitrate contains 207 grams of lead

100 gram of lead nitrate contains

207 x 100 / 331  = 62.6 %

It can be deduced that percentage by mass of lead in Pb(NO₃)₂ is B. 62.6%.

From the given information, Pb(NO₃)₂ = 207 + 124 = 331 grams.

Therefore, 331 gram of lead nitrate contains 207 grams of lead. It can be deduced that 100 gram of lead nitrate will contain:

= 207 x 100 / 331

= 62.6 %

In conclusion, the correct option is 62.6%.

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Answer:

Explanation:

Molecular reaction

Zn + Cu( NO₃ )₂ = Zn( NO₃ )₂ + Cu

Complete reaction

Zn + Cu⁺² + 2 NO₃⁻ =  2 Zn⁺² + 2 NO₃⁻ + Cu

net ionic reaction

Zn + Cu⁺² = Zn⁺² + Cu

Answer:

4

Explanation:

H2S(g) + O2(g) → S8(l) + H2O(g)

Upon balancing the equation;

8H2S(g) + 4O2(g) → S8(l) + 8H2O(g)

The coefficient of O2 in the reaction above is 4.

The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of reaction is always conserved. Therefore, the mass of the mixture is 1025g. the correct option is option C.

According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier. Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved.

mass of salt+ mass of water=mass of solution

mass of salt =25 grams

mass of water=1,000 grams

substituting the given values, we get

25 grams+ 1,000 grams =mass of solution

mass of solution=1025g

Therefore, the mass of the mixture is 1025g. the correct option is option C.

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Explanation:

In the reaction of magnesium with hydrochloric acid magnesium chloride and hydrogen gas is formed.

Equation -

Mg + 2HCl → MgCl₂ + H₂↑

Therefore,

Option A is correct ✔.

Answer:

Its A

Explanation: Just took the Pre-Unit test

Answer:

Explanation:

k = 1.8 x 10⁻⁴ s⁻¹

no of moles initially = 2.45 x .17 = .4165 moles

initial moles a = .4165

k = (1 / t ) ln a / ( a - x )

a is initial moles , x is moles reacted .

a is initial moles , x is moles reacted .

time t = 195 min = 11700 s

1.8 x 10⁻⁴ = 1 / 11700 x ln .4165 /( .4165 - x )

2.106 = ln .4165 /( .4165 - x )

.4165 /( .4165 - x ) = e²°¹⁰⁶ = 8.215

.4165 = 3.42 - 8.215 x

8.215 x = 3.0035

x = .3656

moles of sucrose hydrolysed = .3656 moles.

Answer:

The molar mass is 210.49 g/mol

Explanation:

Answer:

D. What do cuttlefish have in common?

Explanation:

A P E X 2021 :)

The  question that a scientist might ask about cuttlefish is, "What do cuttlefish have in common that is present in Option D?" as the cuttlefish is an invertebrate and a member of the phylum Mollusca.

The phylum Mollusca includes the octopus, cuttlefish, and other aquatic animals with soft bodies that can easily blend in with the background in order to capture prey or avoid the predator, and they have other adaptations too, such as the digestive system and other organs, as they are organ-level organisms. They have the outer hard shell that is present in the snail, and they can reproduce sexually and show larval forms of development.

Hence, the question that a scientist might ask about cuttlefish is, "What do cuttlefish have in common that is present in Option D?" as the cuttlefish is an invertebrate and a member of the phylum Mollusca.

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Answer:

Yes, the intensity of the laser does affect the amount of current that flows through the photo tube. The more intense the light, the more electrons are expelled, and thus the higher the current.

Explanation: Hope this helps!

Yes, the intensity of the laser does affect the amount of current that flows through the photo tube.

Laser light is a form of electromagnetic radiation and should not be confused with ultrasound or other electromedical therapies.

Laser light is of an electrical and magnetic character. Laser light can change the chemical structure of cells and tissue, which visible light cannot.

Thus laser light differs significantly from visible light.

The intensity of a laser beam is the optical power per unit area, which is transmitted through the target surface to the spread direction.

The units of the optical intensity  are W/m2 or more commonly W/cm2.

Therefore ,we can conclude that laser light does effect the amount of current that flows through phototube.

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Answer:   Bonds form when atoms share or transfer valence electrons. Valence electrons are the electrons in the outer energy level of an atom that may be involved in chemical interactions. Valence electrons are the basis of all chemical bonds.

Explanation: Due to atoms and science ;)

Answer:

throught transferring or sharing an electron

Explanation:

a p e x :)))

Answer:

Explanation:

 pH = 5.7

- log [ H⁺ ] = 5.7

[ H⁻ ] = 10⁻⁵°⁷ M

= 2 x 10⁻⁶ M

[ H⁺ ] x [ OH⁻ ] = 10⁻¹⁴

2  x 10⁻⁶ x [ OH⁻ ] = 10⁻¹⁴

[ OH⁻ ] = .5 x 10⁻⁸ M

= 5 x 10⁻⁹ M

Answer:

3

Explanation:

I have indeed already took the quizzes my friend

Answer:

The shape around the carbon is linear . Sp hybridisation generally tends to be linear.

Explanation:

The hybridization procedure includes blending of the valence s orbital with one of the valence p orbitals to yield equal sp hybrid orbitals which can be orientated in a linear geometry. The p orbital is one orbital that could keep up to 2 electrons. The sp set is equal orbitals that factor 180° from every other.

Hence , the answer is linear shape around the carbon.

Answer:

[tex]m_{HCl}^{leftover}=7.50g[/tex]

Explanation:

Hello.

In this case, since the undergoing chemical reaction is:

[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]

In order to identify the limiting reactant, we compute the available moles of sodium hydroxide (molar mass = 40 g/mol) and the moles of hydrochloric acid consumed by those moles via their 1:1 mole ratio considering the chemical reaction:

[tex]n_{HCl}=25.0gNaOH*\frac{1molNaOH}{40gNaOH} *\frac{1molHCl}{1molNaOH} =0.625molHCl[/tex]

Next, since the molar mass of hydrochloric acid is 36.46 g/mol, we compute the mass of that reactant that is actually consumed:

[tex]m_{HCl}=0.625molHCl*\frac{36.46gHCl}{1molHCl}=22.8gHCl[/tex]

In such a way, the leftover of HCl is:

[tex]m_{HCl}^{leftover}=30.3g-22.8g\\\\m_{HCl}^{leftover}=7.50g[/tex]

Best regards!

Answer:

Well to start, as fragile as the eggs are, there should be a more durable material you feel me? Like maybe try something such as a rubbery product but one that isn't so tough on outside but not too soft on the inside. Basically a cushion but where is accessible for the eggs. We also dont want a material that is way to hard because it leaves no room for the eggs and its a very difficult workspace.

Explanation:

Hope this helps and good luck on your project :)

natural selection

Explanation:

Answer: It will kind of make like a type of tough or soft dough

Explanation: If you add too much water it might be a dough that bearly tays together or is very soft, but if you add too little it will be hard to mold. The reason it forms a sort of consistency like this is because When water is added to flour and mixed, these proteins absorb water, otherwise known as hydrating. Gliadin and Glutenin then combine to form the protein called GLUTEN. ... When flour is mixed with water, the gluten swells to form a continuous network of fine strands.

The possible quantum numbers for 5f are :

Each orbital in an atom consists of 4 quantum numbers  

n is the principal quantum number ---> describes the size of the orbitals  

l is the angular momentum / azimuthal quantum number -> describes the shape of the orbitals.  

ml, the magnetic quantum number -> describes the orientation of orbitals in space  

ms, the electron-spin quantum number ---> describes the spin of electrons  

Value of n: positive integer  

value of l: s = 0, p = 1, d = 2, f = 3, ... (n-1)  

ml value: between -l to + l  

ms value: +1/2 or -1/2  

So the possible quantum numbers for 5f are :

Because the answer choices are not very clear, please see the composition I have described above

Answer:

5.66g of Cu(OH)2 can be produced

Explanation:

Cu(NO3)2 reacts with KOH, as follows:

Cu(NO3)2 + 2KOH → Cu(OH)2 + 2KNO3

76.0mL of 0.764M Cu(NO3)2 are, in moles:

0.0760L * (0.764mol / L) = 0.0581 moles Cu(NO3)2

As 1 mole of Cu(NO3)2 produce 1 mole of Cu(OH)2, the moles of Cu(OH)2 produced are 0.0581 moles Cu(OH)2.

Molar mass of Cu(OH)2 is 97.561g/mol. In 0.0581 moles there are:

0.0581 moles Cu(OH) * (97.561g / mol) =

Answer:

The addition of NH₃⁺

Explanation:

A buffer is an aqueous mixture of a weak acid and its conjugate base or vice versa.

In ammonium iodide, NH₄I, the ions in solution are ammonium ion, NH₄⁺ and iodide ion, I⁻.

The iodide ion is the conjugate base of the HI, a STRONG ACID, that means the addition of HI in solution wouldn't produce a buffer.

And, NH₄⁺ is the conjugate acid of the NH₃, a WEAK BASE, that means the addition of NH₃ to the solution will produce a buffer: The mixture of a weak base, NH₃ and its conjugate acid, NH₄⁺

Answer:

this the one i needed help on pleasee sb help meh out

Explanation:

Answer:

A cold front is moving to the north and west before a warm front moves through.

Explanation:

Answer:

Explanation:

The Chromite ore is used for the production of Chromate/dichromate formation.

[tex]4FeCr2O4 + 8Na2CrO4+7O2 \\[/tex] →[tex]8NaCrO4 +2Fe2O3 +8CO2\\yellow[/tex]

so[tex]Na2CrO4[/tex] is called Chromite ore which is of yellow color.

[tex]Na2CrO4 +2H^+[/tex] → [tex]Na2CrO4 +2Na^+ +H2O[/tex]

                                [tex]Orange[/tex]

so when sodium chromate is reacted with hydrogen ion it forms sodium dichromate which is of orange color

Now

[tex]Na2Cr2O7+2KCl[/tex]→[tex]K2Cr2O7 + NaCl[/tex]

The chromate and dichromate are interconvertible in aqueous solution depending upon the PH of solution

Acid medium: [tex]Cr2O4^2-[/tex] [tex]2H^+[/tex]→[tex]Cr2O7^2-[/tex][tex]+H2O[/tex]

Base:[tex]Cr2O7^2- +2OH^-[/tex]→  [tex]CrO4^2- +H2O[/tex]

Hence Chromate and dichromate are interconvertible and hold and equilibrium.

Answer:

Standard solution

Explanation:

The correct answer would be a standard solution.

By definition, a standard solution is a solution whose concentration is known and which is often used to determine the concentration of other substances in, for example, titration. The process of using a solution of known concentration to determine the concentration of another substance is known as standardization.