If you go up the periodic table, the alkali metals get
smaller, less reactive
smaller, more reactive
bigger, less reactive
bigger, more reactive

ANSWER:Atoms

Explanation:

when heat energy is the result of movement of tiny particles called atoms. molecules or ions in solid liquids and gases heat energy can be transferred from one object to another the transfer or flow due to the difference in temperature between the two objects is called heat

The empirical formula of the compound formed when 2.7g of aluminum forms 5.1g of its oxide is Al2O3.

To find the empirical formula, first calculate the molar mass of aluminum oxide by multiplying the molar mass of aluminum (26.98 g/mol) and the molar mass of oxygen (15.99 g/mol) and adding them together (26.98 g/mol + 15.99 g/mol = 42.97 g/mol).
Next, divide the given mass of aluminum oxide (5.1g) by the molar mass of aluminum oxide (42.97 g/mol) to calculate the number of moles of aluminum oxide (5.1g/42.97 g/mol = 0.119 mol).
Next, divide the given mass of aluminum (2.7g) by the molar mass of aluminum (26.98 g/mol) to calculate the number of moles of aluminum (2.7g/26.98 g/mol = 0.100 mol).
Now calculate the mole ratio of aluminum to oxygen by dividing the number of moles of aluminum by the number of moles of oxygen (0.100 mol/0.119 mol = 0.8403).
Finally, express this ratio in terms of whole numbers. The empirical formula of the compound formed is Al2O3.

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If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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The mass of water that can be made would be 36.03 grams.

From the balanced chemical equation:

1 mole N2H4 produces 4 moles H2O2

0.750 mole N2H4 will produce = 0.750 x 4/1 = 3.000 moles H2O2 (limiting reactant)

0.500 mole H2O2 is used, which is less than the amount produced by N2H4, so it is also a limiting reactant.

Now, we can use the mole ratio between H2O2 and H2O to calculate the moles of water produced:

1 mole H2O2 produces 4 moles H2O

0.500 mole H2O2 will produce = 0.500 x 4/1 = 2.000 moles H2O (limiting reactant)

Finally, we can use the molar mass of water to convert the moles of water to grams:

2.000 moles H2O x 18.015 g/mol = 36.03 g H2O

Therefore, 36.03 grams of water can be made from the given amounts of N2H4 and H2O2.

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To calculate the pH of a solution, we can use the formula:

pH = -log[H3O+]

where [H3O+] is the concentration of hydronium ions in the solution.

Substituting the given value of [H3O+] into the formula, we get:

pH = -log(8.5 x 10^-5) = 4.07

Therefore, the pH of the solution is approximately 4.07.

Answer:

no it's is false because an electron have negative charges and it is not inside the atom and it is found out side the nucleus

1) The reaction is exothermic and heat is a product

2) The color would turn to pink.

Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.

If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.

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The statement describe the transfer of heat is : the ice cubes gains the heat energy and the water looses the heat energy.

The law of mass of conservation mass states that mass neither be created or nor be destroyed. The law of mass of conservation energy states that the heat energy in the isolated system should de constant. if the one thing is loose the energy then the other in will gains the energy in an isolated system. according to the conditions the ice cube is at lower energy .

Thus the ice cube will gains the the heat energy that the water looses the heat energy.

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Answer:

halogens

hope its right

Answer:

there combine with an acid called sodium chloride or magnesium sulphate

Answer:

2 significant figures i.e. 2 and 7.

Explanation:

We need to find the number of significant figures in the given number i.e. \(2.7\cdot10^{-3}\).

It has 2 significant figures i.e. 2 and 7.

It means the power of 10 doesn't count in the significant figures.

Hence, there are 2 significant figures.

a = 0, b = 0 and c= 1

Carbon a has 3 bonds with carbon and no hydrogen, carbon b has 4 bonds with carbon and no hydrogen and carbon c has only 1 bond with carbon and 3 bonds with hydrogen

Carbon is a chemical element with symbol C and atomic mass 6.

It is a chemical building block of all the life on earth. It is widely distributed forming organic compounds when combined with hydrogen, oxygen, nitrogen etc.

Carbon can easily form bond with hydrogen and oxygen atoms

Thus, a = 0, b = 0 and c= 1

Carbon a has 3 bonds with carbon and no hydrogen, carbon b has 4 bonds with carbon and no hydrogen and carbon c has only 1 bond with carbon and 3 bonds with hydrogen.

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Your question is incomplete, but probably your complete question was

in each box, write the number of H's that each labeled carbon has. for example, if the carbon next to the letter a has 3H's write in the box marked a.

The image is attached

Compound with a formula mass of 42. 08 amu i found to be 85. 64% carbon and 14. 36% hydrogen by mass is Molecular formula=C3H6

As with all of these problems, we assume 100 g

of unknown compound.

And thus, we determine the elemental composition by the given percentages.

Moles of carbon = 85.64 g / 12.011 g/mol = 7.13 mol

Moles of hydrogen = 14.36 g / 1.00794 g/mol = 14.25 mol

Clearly, there are 2 moles of hydrogen per mol of carbon. And thus the empirical formula is CH2

And molecular formula = n × (empirical formula)

Thus,

42.08g mol−1 = n× (12.011 +2 ×1.00794)⋅g⋅mol−1

And thus

n = 3 , and molecular formula = C3H6

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Answer:

Hey mate

Explanation:

Yes these methods are only used in biology, chemistry, physics, geology and physcology.... They can't be used in maths or other subject, as it is said SCIENCE IS SCIENCE!

Hope it helps you,

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The chemical equation for the reaction of Sn2(aq) to Sn4(aq) in an acidic or basic solution is:Sn2(aq) + 2e- → Sn4(aq)

What is the chemical equation for the reaction of Sn2(aq) to Sn4(aq) in an acidic or basic solution?

In this reaction, Sn2(aq) is being oxidized to Sn4(aq) by losing two electrons (2e-). The oxidation state of Sn increases from +2 to +4.

It's important to note that the phases of the substances involved in the reaction are not specified in the question.

However, based on the naming conventions, "(aq)" indicates that the substances are in aqueous solution, meaning they are dissolved in water.

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Answer:

P = 9800 Pa

Explanation:

Given that,

The mass of a box, m = 30 kg

Length of the box, l = 0.2 m

The width of a box, b = 0.15 m

We need to find the pressure it exerted on the floor. Pressure is equal to force acting per unit area. So,

\(P=\dfrac{F}{A}\\\\=\dfrac{mg}{lb}\\\\=\dfrac{30\times 9.8}{0.2\times 0.15}\\\\P=9800\ Pa\)

So, 9800 Pa of pressure is exerted on the floor.

To convert benzoic acid into benzoic anhydride, you can use the following reagent: acetic anhydride in the presence of a catalyst like pyridine or DMAP (4-dimethylaminopyridine).

Here's a step-by-step explanation:
1. Combine benzoic acid with acetic anhydride.
2. Add a catalyst such as pyridine or DMAP to the reaction mixture.
3. Heat the mixture gently to promote the reaction.
4. The benzoic acid will react with acetic anhydride to form benzoic anhydride and acetic acid as a byproduct.

In summary, the reagent acetic anhydride, along with a catalyst like pyridine or DMAP, can be used to convert benzoic acid into benzoic anhydride.

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To determine the approximate pH of buffer 1, we can use the Henderson-Hasselbalch equation, which is a mathematical expression that relates the pH of a buffer solution to the pKa and the ratio of the concentrations of the conjugate base and the weak acid.                                                                                                                                                                    

The equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the weak acid. By plugging in the relevant values for buffer 1, we can calculate an approximate pH. However, it's important to note that this equation is only an approximation and assumes certain conditions are met.
This formula helps calculate the pH of a buffer solution, enabling you to estimate the pH of buffer 1 based on its components.

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1. a

2. a

3. b

4. b

5. c

6. a

7. c

(A) Eo cell for the given electrochemical cell is -1.14V. (B) The electrode that is negatively charged is the anode, which is made up of copper (Cu). (C) At the cathode (Ag electrode): Ag⁺ + e⁻ → Ag

At the anode (Cu electrode): Cu → Cu²⁺+ 2e⁻

(D) Overall reaction: 2Ag⁺ + Cu → 2Ag + Cu²⁺

An electrochemical cell, also known as a voltaic cell or a galvanic cell, is a device that generates electrical energy from a chemical reaction. It consists of two electrodes, a positive electrode (anode) and a negative electrode (cathode), that are immersed in an electrolyte solution that contains ions.

A. To calculate Eo cell, we can use the formula:

Eo cell = Eo cathode - Eo anode

where Eo cathode is the standard reduction potential of the cathode and Eo anode is the standard reduction potential of the anode.

From the given information, Eo of Ag/Ag is -0.80V (since it's a reduction potential, we need to reverse the sign to get the oxidation potential) and Eo of Cu/Cu is 0.34V. Since Ag is the cathode and Cu is the anode in this cell, we can plug in the values and get:

Eo cell = Eo cathode - Eo anode

Eo cell = (-0.80V) - (0.34V)

Eo cell = -1.14V

Therefore, the Eo cell for the given electrochemical cell is -1.14V.

B. The electrode that is negatively charged is the anode, which is made up of copper (Cu).

C. The individual reactions at each electrode are:

At the cathode (Ag electrode):

Ag⁺ + e⁻ → Ag

At the anode (Cu electrode):

Cu → Cu²⁺ + 2e⁻

D. The overall cell reaction can be obtained by combining the individual reactions at the cathode and anode. Since there are two electrons involved in the anode reaction, we need to multiply the cathode reaction by 2 so that the electrons cancel out in the overall reaction:

2Ag⁺ + 2e⁻ → 2Ag (cathode)

Cu → Cu²⁺ + 2e⁻ (anode)

Overall reaction:

2Ag⁺ + Cu → 2Ag + Cu²⁺

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Empirical formula of ascorbic acid Vitamin C or ascorbic acid is an important nutrient required for healthy growth and development.

The molecular formula of ascorbic acid is C6H8O6. The percentage composition of elements in ascorbic acid is as follows:40.92% of Carbon4.58% of Hydrogen54.50% of Oxygen. To find the empirical formula of ascorbic acid, you need to assume that you have 100 grams of the compound. So, the mass of each element is as follows: Carbon: 40.92 gramsHydrogen: 4.58 gramsOxygen: 54.50 gramsConvert the mass of each element into moles by dividing it by its molar mass. Carbon: 40.92/12.01 = 3.41 moles Hydrogen: 4.58/1.01 = 4.54 molesOxygen: 54.50/16.00 = 3.41 molesNow divide each of the mole values by the smallest mole value, which is 3.41 in this case.Carbon: 3.41 / 3.41 = 1Hydrogen: 4.54 / 3.41 = 1.33Oxygen: 3.41 / 3.41 = 1The mole ratio of C:H:O atoms in the empirical formula is 1:1.33:1.The empirical formula of ascorbic acid is CH4O3.The molecular formula for ascorbic acidThe molecular mass of ascorbic acid is given as 176 amu. The molecular formula is the main answer we're looking for. To find it, you need to divide the molecular mass of ascorbic acid by the empirical formula mass.C6H8O6 empirical formula mass = 12.01 × 6 + 1.01 × 8 + 16.00 × 6 = 176.06 amu. Molecular formula = empirical formula × n176 amu = 176.06 amu × n = n × empirical formula empirical formula is CH4O3 n=5The chemical formula of ascorbic acid is C5H5O5.

The empirical formula of ascorbic acid is CH4O3 and the chemical formula for ascorbic acid is C5H5O5.

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Answer:

Elements?

Explanation:

Im not sure but I think its elements because carbon dioxide is, and the others sound like it too

The speed of sound in substances is ranked in this order: 25°Cair, 50°C air, water and steel

Matter is anything that has mass and can occupy space. Matter can be classified into three, solid liquid and gas. In the substance named in the question, steel is solid, air is gas and water is liquid.

The speed of sound varies in matter. For example Sound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air. Due to the closeness of the particle of steel sound travels in it fastest to water and air. The compatibility of the molecule of water is greater than that of air. However, sound travels faster in hot air than cold air.

This means in the order of slowest to fastest it will be ; 25°Cair, 50°C air ,25°C water and steel.

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Given the data, the best statement is: the marble weighs more than an equivalent volume of the water (Opiton C)

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

The density of marble (2.7 g/cm³) is greater than that of water (1 g/cm³). This implies that marble is heavier than equivalent volume of water. Thus, marble will sink when place in water.

From the above, we can conclude that the correct answer to question is: the marble weighs more than an equivalent volume of the water (Option C)

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If you added 0.5 g of sample 1 instead of 2.0 g, the freezing point temperature of the solution would decrease.

When a solute is added to a solvent, it disrupts the formation of the solvent's crystal lattice structure, lowering the freezing point of the solution. The extent to which the freezing point is lowered depends on the concentration of the solute particles in the solution. In this case, by reducing the amount of sample 1 from 2.0 g to 0.5 g, the concentration of solute particles in the solution would decrease.

Since the freezing point depression is directly proportional to the concentration of solute particles, a decrease in the amount of sample 1 would result in a smaller decrease in the freezing point temperature compared to if 2.0 g were added. In other words, the solution would experience a less significant decrease in freezing point temperature with only 0.5 g of sample 1.

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The balanced reaction under neutral conditions is Hg2+ + Zn --> Hg + Zn2+, and the common number of electrons for both half reactions is 2.

To determine how many electrons are needed to find a common number of electrons for each half reaction, follow these steps:

1. Identify the two half reactions:
  Oxidation half reaction: Zn --> Zn2+
  Reduction half reaction: Hg2+ --> Hg

2. Balance the atoms in each half reaction:
  Oxidation half reaction: Zn --> Zn2+ + 2e- (Zn loses 2 electrons)
  Reduction half reaction: Hg2+ + 2e- --> Hg (Hg gains 2 electrons)

3. Determine the common number of electrons:
  In this case, both half reactions involve the transfer of 2 electrons. Therefore, the common number of electrons for both half reactions is 2.

Now we can combine the balanced half reactions to obtain the balanced equation under neutral conditions:

Hg2+ + Zn --> Hg + Zn2+

In summary, the balanced reaction under neutral conditions is Hg2+ + Zn --> Hg + Zn2+, and the common number of electrons for both half reactions is 2.

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The empirical formula of the oxide of sulfur is 1.) SO₃, based on the given mass percentages of sulfur and oxygen in the sample.

First, we need to assume that we have a 100-gram sample of the oxide. From the problem, we know that the sample contains 40 grams of sulfur and 60 grams of oxygen.

Next, we need to find the moles of each element in the sample. To do this, we divide the mass of each element by its molar mass. The molar mass of sulfur is 32.06 g/mol, and the molar mass of oxygen is 16.00 g/mol.

Number of moles of sulfur = 40 g / 32.06 g/mol = 1.247 mol
Number of moles of oxygen = 60 g / 16.00 g/mol = 3.750 mol

Next, we need to divide the number of moles of each element by the smallest number of moles. In this case, sulfur has the smallest number of moles, so we divide both by 1.247.

Number of moles of sulfur = 1.247 mol / 1.247 mol = 1.00 mol
Number of moles of oxygen = 3.750 mol / 1.247 mol = 3.01 mol

Now we have the mole ratio of sulfur to oxygen, which is 1.00 : 3.01. We can simplify this ratio by dividing both numbers by the smallest number (1.00).

Mole ratio of sulfur to oxygen = 1.00 : 3.01
Simplified mole ratio = 1 : 3.01

The empirical formula of the oxide of sulfur is therefore SO₃.

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