what is gold on the periodic table of element

Answer:

about 4.8kJ

Explanation:

There is some missing information in the question given.

For use to determine the amount of heat that must be reacted in the system to convert 100g of NaNO₃ into NaHSO₄(s);

Then, we need to consider the following reaction between sodium nitrate (NaNO₃)  and sulfuric acid (H₂SO₄):

[tex]\mathbf{NaNO_{3(s)}+ H_2SO_{4(l)}\to NaHSO_{4(s)}+HNO_{3(g)} \ \ \ \ \ \Delta H = 21.2 \ kJ}[/tex]

From the above reaction, 84.99 gm of NaNO₃ reacted with H₂SO₄ which is converted into NaHSO₄ thereby absorbing 21.2 kJ amount of heat.

This implies that; if 84.99 gm of NaNO₃ absorbs 21.2 kJ amount of heat.

1 gm of NaNO₃ will absorb = [tex]\mathsf{\dfrac{21.2}{84.99} \ kJ \ heat}[/tex]

= 0.2494 kJ amount of heat.

∴

100 g of NaNO₃ will absorb [tex]= \mathsf{\dfrac{21.2}{84.99} \times 100 \ kJ \ heat}[/tex]

= 24.94 kJ amount of heat.

Therefore, we can conclude that the amount of heat that must be absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s) is 24.94 kJ.

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Answer:

197.0 amu

Explanation:

Answer:

two oxygen atoms

One mole of oxygen gas, which has the formula O2, has a mass of 32 g and contains 6.02 X 1023 molecules of oxygen but 12.04 X 1023 (2 X 6.02 X 1023) atoms, because each molecule of oxygen contains two oxygen atoms.

Explanation:

Answer:

The cinnamon cost would be "$8.62". A further explanation is given below.

Explanation:

Cinnamon's density,

= 0.560 g/ml

On converting it into g, we get

= [tex]0.560\times 500[/tex]

= [tex]280 \ g[/tex]

Cinnamon's volume,

= 500 ml

As we know,

1 pound = 435.592 g

Now,

The cost pf cinnamon per pound will be:

=  [tex]\frac{6.98}{0.5 \ pound}[/tex]

=  [tex]13.96[/tex] ($) per pound

So,

Cinnamon's cost will be:

=  [tex]250 \ g\times \frac{1 \ pound}{435.592 \ g}\times \frac{13.96}{1 \ pound}[/tex]

=  [tex]8.62[/tex] ($)

Answer:

142.0 moles CO₂

Explanation:

To answer this question, we first need to know what a mole is. A mole represents [tex]6.022 \cdot 10^{23}[/tex] of something, and in this case, that something is molecules.

So, to convert [tex]8.551 \cdot 10^{25}[/tex] molecules into moles, we need to use the conversion factor  [tex]1=\frac{6.022\cdot 10^{23} \text{molecules} }{ \text{1 mole}}[/tex].

Doing so (using dimensional analysis) gives us:

[tex]8.551 \cdot 10^{25} \text{ molecules } \cdot \frac{\text{1 mole}}{ 6.022\cdot 10^{23} \text{ molecules} } = \frac{8.551 \cdot 10^{25}}{ 6.022\cdot 10^{23}} \text{ moles CO}_2 = \\ \\ 141.996 \text{ moles CO}_2 = \boxed{142.0 \text{ moles CO}_2 }[/tex]

Answer:

False

Explanation:

There is three

Answer:

If you're just looking at the Lewis Structure from the perspective of the octet rule, it does appear that the structure is correct. Dinitrogen always has a lone pair of electrons which could conceivably be used for dative bonding as you suggest. So from that perspective there appears to be nothing wrong at all - other than that it doesn't exist in nature in this way.

Explanation:

The change that would cause entropy to decrease is CO2 gas changing to solid:

Entropy refers to the degree of randomness of a substance.

The higher the degree of randomness the higher the entropy value of that substance.

Entropy increases with increase in temperature as particles of substances gain more kinetic energy.

However, lowering temperature decreases entropy values.

The change from gas to liquid or solid involves lowering of temperature.

Therefore, the change that would cause entropy to decrease is CO2 gas changing to solid.

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Answer:

490 ml

Explanation:

Answer:

Liquid isopropanol.

Explanation:

Liquid isopropanol will evaporate earlier than water because the boiling point of isopropanol is less than water. That liquid which have high boiling point require more heat energy for change into vapor state as compared to those liquids that has low boiling point. The isopropanol has boiling point i.e. 82.5 °C while on the other hand, water has boiling point i.e. 100 °C so we can say that isopropanol will evaporate first.

The liquid that will be the first to evaporate within 5 minutes is; Liquid Isopropanol

We have the 2 liquids as;

Liquid Isopropanol

Liquid water

Now, since we are dealing with the one that will evaporate within five minutes, we need to know their boiling points.

From online research;

Boiling point of liquid isopropanol is 82.5°C

Boiling point of liquid water is 100°C

Now, we are told that the same energy is transferred for both liquids. However, boiling point of the liquid with the lower boiling point will be achieved first and as a result will evaporate first since the next stage after boiling point is evaporation of steam.

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Answer:

the answer is B

Explanation: Trust me I took the test

The correct option is option B which is electrical to mechanical.

When using a power drill, the energy transformation that occurs is from electrical energy to mechanical energy. The power drill is powered by electricity, which is converted into mechanical energy to rotate the drill bit and perform the desired work. The electrical energy is converted into the mechanical energy of rotational motion.

Hence, the correct option is option b

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Answer:

Physiological

Explanation:

The process whereby plants respond and grow towards light is a physiological process.

Physiological processes are life-sustaining processes that require the combined efforts of cells, tissues, organs, and or systems along with that of biomolecules in the body.

The response of plants to light requires the efforts of a hormone that triggers the rapid mitotic division of cells of tissues/organs that are directly opposite the light source. Thus, the faster rate of division of these cells as compared to the cells of tissues/organs that are directly in contact with light leads to the plant's tissues/organs bending towards the light.

Answer:

H2 would have a coefficient of 2.

Explanation:

According to the balanced chemical equation, the coefficient of hydrogen is 4.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Answer:

Change occur due to change in the state.

Explanation:

The model must be changed from the previous one because the liquid is exposed to high temperature which change the liquid into gaseous state. Due to change in the state from liquid into gas, the particles are present at more distance from each other because the gas molecules has more distance due to weak intermolecular forces so we can say that change must occur in the model.

Answer:

27J

Explanation:

Answer:

the answer to this question B. Two H nuclei that fused into one He necleus

Explanation:

Two hydrogen atoms fused to one helium molecule, hence option B is correct.

Fusion is defined as a process in which two or more atomic nuclei unite to create new atomic and subatomic particles. Heat, which is produced when two atoms fuse, is the key to generating energy. Similar to how nuclear fission produces energy, this heat can be utilized to warm water, produce steam, and turn turbines to produce electricity.

In the core of the Sun, hydrogen is being converted to helium. This phenomenon is known as nuclear fusion. Fusion is what powers both the sun and the stars. One example of this kind of reaction is when two hydrogen atoms combine to form a helium atom. During the process, a portion of the hydrogen's mass is converted into energy.

Thus, two hydrogen atoms fused to one helium molecule, hence option B is correct.

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Answer: 18 moles of oxygen will be used.

Explanation:

Combustion is a chemical reaction in which a hydrocarbon is oxidized in the presence of oxygen to give carbon dioxide and water.

The balanced chemical reaction for combustion of ethanol is:

[tex]C_2H_6O+3O_2\rightarrow 2CO_2+3H_2O[/tex]

According to stoichiometry :

1 mole of ethanol require  = 3 moles of [tex]O_2[/tex]

Thus 6 moles of ethanol will require=[tex]\frac{3}{1}\times 6=18moles[/tex]  of [tex]O_2[/tex]

Thus 18 moles of oxygen will be used.

Answer:

B

Explanation:

A body moving with a constant speed and constantly changing direction and changing velocity is said to be in circular motion.

Answer:

bad stuff such as ashes and chemicals in the air from that fire could bring bad stuff to the water

Explanation:

This satellite image depicts an area in Alaska after a fire. Because the fire disrupted animal habitats and caused animals to flee, more sediment entered the river.

A satellite, also known as an artificial satellite, is an object that is purposefully placed in orbit in outer space. Satellites are used for a variety of purposes such as communication relay, weather forecasting, navigation, broadcasting, scientific research, and Earth observation.

A satellite is any object that orbits another object, such as the Earth orbiting the sun. Hundreds of satellites are in operation. They serve a variety of functions, including weather forecasting, television signal transmission, amateur radio and internet communications, and the Global Positioning System.

GEO (Geostationary Earth Orbit) at approximately 36,000 kilometers above the earth's surface. LEO (Low Earth Orbit) is 500–1500 kilometers above the earth's surface. MEO (Medium Earth Orbit) or ICO (Intermediate Circular Orbit) at approximately 6000-20,000 kilometers above the earth's surface.

Thus, This satellite image depicts an area in Alaska after a fire.

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Answer:

State is shown inside the parenthesis.

s is for solid

aq is for aqueous solutions

l for liquid

Answer: The enthalpy change for formation of butane is -125 kJ/mol

Explanation:

The balanced chemical reaction is,

[tex]C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(l)[/tex]

The expression for enthalpy change is,

[tex]\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}][/tex]

Putting the values we get :

[tex]\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}][/tex]

[tex]-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0][/tex]

[tex]H_f_{C_4H_{10}=-125kJ/mol[/tex]

Thus enthalpy change for formation of butane is -125 kJ/mol

1) Decomposition

2) CaCO3 → CaO + CO2

equation is already balanced

Answer:

Cytokinesis

Explanation: