Is my answer correct

Answer:

density= 2.7 g/cm3

volume= 25 cm3

mass = density× volume

= 35×2.7

= 94.5 g

Answer:

E) II and III.

Explanation:

Let's consider the complete ionic equation when solutions of acetic acid and sodium hydroxide react. It includes all the ions and molecular species.

CH₃COO⁻(aq) + H⁺(aq) + Na⁺(aq) + OH⁻(aq) ⇒ CH₃COO⁻(aq) + Na⁺(aq) + H₂O(l)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)

The species not present are:

II. acetate ion

III. sodium ion

Answer:

Place the experiments on a scale

Explanation:

If you place two of the same experiments on a scale, and cover one with a cup, the one with the cup will "lose" mass, while the other won't, due to the cup being a "containment field" I guess you could call it.

Answer:

See explanation.

Explanation:

Hello!

In this case, considering the concept of phase change, we understand that it is related how the phases of matter, solid, liquid and gas, are related to each other for a specific substance.

For instance, when going over water, we notice that its most common phase at this atmospheric conditions is the liquid phase; however, if it starts losing energy (being cooled down) its molecules tend to get together and freeze, undergoing a phase change to solid. On the other hand, if heated up, its molecules will be able to get farther to each other and therefore undergo a phase change to gas.

Thus, we can realize that a phase change is also explained molecularly; because when a substance undergo a phase change, its molecules rearrange, according to the addition or removal of energy and therefore get to another phase.

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Answer:

The island of stability is a term from nuclear physics that describes the possibility of elements with particularly stable "magic numbers" of protons and neutrons. This would allow certain isotopes of some transuranic elements to be far more stable than others, that is, decay much more slowly.

Explanation:

P O₂ = 736.2 torr

Given

P tot=760 torr

P H₂O = 23.8 torr

Required

P gas/O₂

Solution

Dalton's law of partial pressures stated that

the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases  

Can be formulated:  

P tot = P1 + P2 + P3 ....  Pn

P tot = P H₂O + P O₂

760 torr = 23.8 torr + P O₂

P O₂ = 760 - 23.8

P O₂ = 736.2 torr

Answer:

the answer is 10

Explanation:

Al2 is 2 atoms by itself

(SiO3)2 is 8 because Si is a single atom and O3 is 3 oxygen atoms but because of the subscript outside of the parentheses it doubles and becomes 2 and 6 respectively

Answer:

Radiative equilibrium is the condition where the total thermal radiation leaving an object is equal to the total thermal radiation entering it. It is one of the several requirements for thermodynamic equilibrium, but it can occur in the absence of thermodynamic equilibrium.

Answer:

Radiative equilibrium is the condition where the total thermal radiation leaving an object is equal to the total thermal radiation entering it. It is one of the several requirements for thermodynamic equilibrium, but it can occur in the absence of thermodynamic equilibrium.

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Answer:

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t857 NJ n8

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Answer:

n=3 the minimum n for which d orbital exist.

Answer: skeletal equation : [tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow NaNO_3(aq)+BaSO_4(s)[/tex]

The products are sodium nitrate and barium sulphate.

balanced equation :  [tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow 2NaNO_3(aq)+BaSO_4(s)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

The skeletal equation is:

[tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow NaNO_3(aq)+BaSO_4(s)[/tex]

The balanced chemical equation is:

[tex]Ba(NO_3)_2(aq)+Na_2SO_4(aq)\rightarrow 2NaNO_3(aq)+BaSO_4(s)[/tex]

Answer:

A. Energy is transferred to different forms .

Explanation:

Hello!

In this case, we need to consider the law of conservation of mass and energy which states that mass and energy cannot be neither created nor destroyed, just modified; it means we can rule out B. and C. so far.

Moreover, since D. is actually true for combustion reactions because they are used to provide energy in industrial operations, this is not the concern here because a combustion reaction is not considered.

Therefore the correct option is A. Energy is transferred to different forms as the energy provided by Rose is transferred to the pendulum system .

Best regards!

Answer:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction

Answer:

+3

Explanation:

Chlorine is anion with a -1 charge. But they are three chlorine atoms.

-1 * 3 = -3

So they have a -3 charge.

So to balance the compound, the nickel has to be a cation with a +3 charge.

-3 + 3 = 0

Furthermore, a chemical bond always has a 0 charge. Remember that.

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Answer:

5

Explanation:

The number of valence electrons in the atom is 5 as can be seen from the ionization energy.

Ionization energy is the measure of the readiness of an atom to lose an electron. The lower the value the easier it is for an atom to lose an electron and vice versa.

Therefore, since we have 5 ionization energies given, the number of valence electrons in this atom is 5.

The net ionic equation :

Pb²⁺(aq)+SO₄²⁻(aq) ⇒ PbSO₄(s)

Given

Reaction

Pb(NO3)2(aq) + H2SO4(aq) + PbSO4(s) + 2 HNO3(aq)

Required

The net ionic equation

Solution

The equation of a chemical reaction can be expressed in the equation of the ions

In the ion equation, there is a spectator ion that is the ion that does not change (does not react) because it is present before and after the reaction

When these ions are removed, the ionic equation is called the net ionic equation

For gases and solids including water (H₂O) can be written as an ionized molecule

Ionic equation :

Pb²⁺(aq)+ 2NO₃⁻(aq) + 2H⁺(aq)+SO₄²⁻(aq) ⇒ PbSO₄(s) + 2H⁺(aq)+NO₃⁻(aq)

2NO₃⁻(aq) + 2H⁺(aq) ⇒ a spectator ions

The net ionic equation :

Pb²⁺(aq)+SO₄²⁻(aq) ⇒ PbSO₄(s)

The net ionic equation is   Pb²⁺(aq)+SO₄²⁻(aq) ⇒ PbSO₄(s)

The given equation is

Pb(NO3)2(aq) + H2SO4(aq) + PbSO4(s) + 2 HNO3(aq)

Writing its ionic equation

Pb²⁺(aq)+ 2NO₃⁻(aq) + 2H⁺(aq)+SO₄²⁻(aq) ⇒ PbSO₄(s) + 2H⁺(aq)+NO₃⁻(aq)

Now the ionic equation contains spectator ions that do not react. They are present in both the reactant and the product.  When these ions are removed, the ionic equation is called the net ionic equation.

2NO₃⁻(aq) + 2H⁺(aq) ⇒ a spectator ions

The net ionic equation is:

Pb²⁺(aq)+SO₄²⁻(aq) ⇒ PbSO₄(s)

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Answer:

0.50

Explanation:

A 0.72-mol sample of PCl₅ is put into a 1.00-L vessel and heated. At equilibrium, the vessel contains 0.40 mol of PCl₃(g) and 0.40 mol of Cl₂(g). Calculate the value of the equilibrium constant for the decomposition of PCl₅ to PCl₃ and Cl₂ at this temperature.

Step 1: Calculate the molar concentrations

[PCl₅]i = 0.72 mol/1.00 L = 0.72 M

[PCl₃]eq = 0.40 mol/1.00 L = 0.40 M

[Cl₂]eq = 0.40 mol/1.00 L = 0.40 M

Step 2: Make an ICE chart

        PCl₅(g) ⇄ PCl₃(g) + Cl₂(g)

I        0.72           0            0

C         -x            +x          +x

E      0.72-x          x           x

Step 3: Determine the value of x

Since [PCl₃]eq = [Cl₂]eq = 0.40 M, x = 0.40 M

Step 4: Determine the concentration of PCl₅ at equilibrium

[PCl₅]eq = 0.72-x = 0.72-0.40 = 0.32 M

Step 5: Calculate the equilibrium constant

Kc = [PCl₃] × [Cl₂] / [PCl₅]

Kc = 0.40 × 0.40 / 0.32 = 0.50

Answer: a

Explanation: the smoker actually exhales the sidestream smoke

Answer:

75.4 g.

Explanation:

Hello there!

In this case, since the solubility stands for the maximum amount of a solute that is completely dissolved in a specific amount of solvent, typically 100 g of water as the universal solvent; we need to take into account that the higher the temperature the higher the solubility for the most of the solids.

In such a way, since the solubility of potassium bromide at 20 °C is 65.3 g per 100 g of water, at 40 °C is 75.4 g per 100 g of water, proving the aforesaid. Therefore, 75.4 g of potassium bromide will form a saturated solution with 100 g of water at 40 °C.

Regards!

Answer:

Glaciers

Explanation:

Reservoirs refers to paces where water are stored. The largest water reservoir on earth are the oceans which contain about 97% of all the water on the earth.

The next highest  reservoir  are the glaciers or the polar ice caps. These hold quite an enormous amount of the water found on earth.

Surface and other fresh water only account for about 1.2% of all the surface water on earth.Ground water accounts for a very minute percentage of the water found on earth.

Answer:

1. 126.44 or 126.4

2. 12.766 or 12.8

3.190.77 or 190.8

4.12.833 or 12.8

Explanation:

The density in lbs/in³ units : 0.697

Given

Density of gold is 19.3 g/cm³

Required

Conversion to  lbs/in³

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

Conversion factor

1 g =  0,00220462 lbs

1 cm³ = 0,0610237 in³

So the density :

[tex]\tt 19.3~\dfrac{g}{1~cm^3}\times \dfrac{cm^3}{0.0610237~in^3}\times \dfrac{0.00220462~lbs}{1~g}=0.697~lbs/in^3[/tex]

Answer:

there is no picture.

Explanation:

Answer:

c

Explanation:

Answer:

66.7 g

Explanation:

Number of atoms = 2×10²¹

Mass of 2×10²¹ atoms = 0.4 g

Mass of 0.5 moles of that element = ?

Solution:

1 mole contain 6.022×10²³ atoms

2×10²¹ atoms × 1 mol / 6.022×10²³ atoms

0.33×10⁻² mol

0.003 mol

 0.003 mole have mass of 0.4 g

0.5 mol have mass 0.5/0.003×0.4 g = 66.7 g

Answer:

B

Explanation:

Answer:

Explanation:

2. Our cells produce a lot of waste that must be eliminated (excreted) from the body. These residues are called excreta. The residues formed from the chemical reactions that take place inside the cells can be eliminated through:

• of the respiratory system (carbon dioxide)

• skin (sweat)

urinary system (urine)

Our cells expel these substances to maintain the dynamic balance (homeostasis) of our body and promote our well-being.

Answer: 95 degrees fahrenheit hope this helps :]

Explanation:

Answer:

1. acid produced by plants growing on rocks

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Answer:

C.

Explanation: In nuclear fission and fusion reactions, some of the energy in matter is converted to energy.  If you weigh the reactants and the products, the products will weigh less than the reactants.  This is called the mass defect and is the result of turning matter into energy.

Answer:

D.

Explanation:

With the Fat Boy and Little Boy nuclear bombs that were drop on Japan, They used a little gun (inside the bomb) that shot a little slug. this hit and caused a chain reaction that caused the bomb to detonate. This released much energy. Destroying much of the two cities when the bombs were dropped.