1. The following reaction does not proceed to form a product: H2O + Au---> no reaction. Why is that?A) Gold has a higher activity than hydrogen and cannot replace it.
B) Gold has a lower activity than hydrogen and cannot replace it.
C) The reaction cannot occur because water is a reactant.
D) The reaction proceeds too slowly to create products.

2. Which of the following is the balanced form of the equation C2H6 + O2 --> CO2 + H2O?

answer choices are attached A,B,C,D top to bottom

3. The equation 2NaNO3 + CaCl2 ---> 2NaCl + Ca(NO3)2 is balanced. How many atoms of sodium (Na) are there on either side of the equation?

A) one
B) two
C) four
D) six

4. All single-displacement reactions can be classified as another type of reaction as well. What type of reaction is that?

A) combustion
B) redox
C) synthesis
D) decomposition

5. If ions change places and a gas is formed, then what type of reaction is indicated?

A) double-displacement
B) synthesis
C) decomposition
D) single-displacement

Answers

Answer 1

Answer: 1. B
The positive charge in water is provided by hydrogen, and gold provides the same charge. However, gold is not more reactive than hydrogen so it can not replace it in the compound.

2. In order to balance the equation, you must sure there are equal moles of each element on the left and right side of the equation:
2C₂H₆ + 7O₂ → 4CO₂ + ₆H₂O

3. The number of moles of sodium atoms on the left of the equation must be equal to the number of moles of sodium atoms on the right, as per the law of conservation of mass. The answer is B.

4. C.
A synthesis reaction usually results from single displacement because some element or compound is produced in its pure form

5. B.
The gas being produced is being synthesized.

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A _________ shampoo is designed to re-balance the pH level of your hair by neutralizing any alkali and unwanted residues in the hair. Options: A) Clarifying B) Moisturizing C) Neutralizing D) Medicated

Answers

Answer:

C) Neutralizing

Explanation:

A neutralizing shampoo is specifically formulated to restore the pH balance of the hair by neutralizing any alkali or unwanted residues that may have accumulated. It is commonly used after chemical treatments such as perms or relaxers, which can alter the hair's pH level.

Chemical processes like perms and relaxers often involve the use of alkaline substances to break down and reshape the hair structure. After the process is complete, a neutralizing shampoo is used to stop the chemical reaction and bring the hair's pH back to its normal, balanced state. This helps to ensure the hair's health, smoothness, and manageability.

Which element has four energy levels? Na,K,Cs,Rb

Answers

Answer:

The correct option is: Potassium

Explanation:

Sodium, Potassium, Rubidium and Caesium are referred to as the alkali metals that belong to the group 1 of the periodic table, thus having one valence electron in their outer or valence shell.

Sodium, atomic number 11, belongs to the period 3 of the periodic table. It has three shells and the number of electrons per shell is 2, 8, 1.

Potassium, atomic number 19, belongs to the period 4 of the periodic table. It has four shells and the number of electrons per shell is 2, 8, 8, 1.

Rubidium, atomic number 37, belongs to the period 5 of the periodic table. It has five shells and the number of electrons per shell is 2, 8, 18, 8, 1.

Caesium, atomic number 37, belongs to the period 6 of the periodic table. It has six shells and the number of electrons per shell is 2, 8, 18, 18, 8, 1.

Therefore, Potassium, atomic number 19, has four shells or energy levels.

Among the given options, the element that has four energy levels is potassium (K). The correct answer is option 2.

An energy level is a specific amount of energy that an electron in an atom can possess.

The electronic configurations of Na (sodium), K (potassium), Cs (cesium), and Rb (rubidium) are as follows:

Na: $\rm 1s^2 2s^2 2p^6 3s^1$

K: $\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1$

Cs: $\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^(10)4p^6 5s^2 4d^(10) 5p^6 6s^1$

Rb: $\rm 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^(10) 4p^6 5s^1$

The above electronic configurations shows that only Potassium has 4 energy levels while Na has 3 energy levels, Cs has 6 energy levels and Rb has 5 energy levels.

Therefore, the correct answer is option 2. Potassium (K) has four energy levels.

Learn more about energy level here:

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Sulfur and fluorine react in a combination reaction to produce sulfur hexafluoride: S(g) + 3F2(g) ->SF6(g) If 50 g S is allowed to react as completely as possible with 105.0g F2(g), what mass of the excess reactant is left.

Answers

Answer: The mass of excess reagent left is 20.48 g

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For sulfur:

Given mass of sulfur = 50 g

Molar mass of sulfur = 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of sulfur}=(50g)/(32g/mol)=1.56mol$

For fluorine gas:

Given mass of fluorine gas = 105 g

Molar mass of fluorine gas = 37.99 g/mol

Putting values in equation 1, we get:

$\text{Moles of fluorine gas}=(105g)/(37.99g/mol)=2.76mol$

The chemical equation for the reaction of sulfur and fluorine gas follows:

$S(g)+3F_2(g)\rightarrow SF_6(g)$

By Stoichiometry of the reaction:

3 moles of fluorine gas reacts with 1 mole of sulfur

So, 2.76 moles of fluorine gas will react with = $(1)/(3)* 2.76=0.92mol$ of sulfur

As, given amount of sulfur is more than the required amount. So, it is considered as an excess reagent.

Thus, fluorine gas is considered as a limiting reagent because it limits the formation of product.

Moles of excess reagent (sulfur) left = 1.56 - 0.92 = 0.64 moles

Now, calculating the mass of sulfur from equation 1, we get:

Molar mass of sulfur = 32 g/mol

Moles of sulfur = 0.64 moles

Putting values in equation 1, we get:

$0.64mol=\frac{\text{Mass of sulfur}}{32g/mol}\n\n\text{Mass of sulfur}=20.48g$

Hence, the mass of excess reagent left is 20.48 g

The mole number of 50 g S is 1.563 mol. 105.0 g F2 is 2.763 mol. The ratio of S and F2 is 1:3. So the excess one is S. And mass left is 0.642*32=20.52 g.

In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this?tetragonal
hexagonal
triclinic
cubic

Answers

Answer : The correct option is, Cubic.

Explanation :

As there are seven types of crystal systems which are cubic, tetragonal, orthorhombic, monoclinic, triclinic, rhombohedral and hexagonal.

A unit cell is characterized by the axial length (a, b and c) and axial angle $(\alpha ,\beta ,\gamma )$ parameters which decide the size and shape of the unit cell.

In tetragonal crystal system, $a=b\neq c$ and $\alpha=\beta=\gamma=90^o$

In hexagonal crystal system, $a=b\neq c$ and $\alpha=\beta=90^o,\gamma=120^o$

In triclinic crystal system, $a\neq b\neq c$ and $\alpha\neq \beta\neq \gamma=90^o$

In cubic crystal system, $a=b=c$ and $\alpha=\beta=\gamma=90^o$

Hence, the correct option is, Cubic.

Iron(III) oxide + carbon yields carbon monoxide and iron (write the correct formulas and then balance)

Answers

Iron(III) oxide = Fe₂O₃
Carbon = C
Carbon monoxide = CO
Iron = Fe

Fe₂O₃ + C ⇒ CO + Fe

These are the correct formulas, but the equation is not balanced. There are two Fe's on the left side, so we have to put a 2 in front of the Fe on the right. Also, there are 3 O's on the left but only 1 on the right, so we need to put a 3 in front of the CO; however, this 3 makes it 3 C's on the right, so we balance that off by putting a 3 in front of the C on the left:

Fe₂O₃ + 3C ⇒ 3CO + 2Fe

Fe(coeffecient 2)O(coeffecient 3) +3C=3CO+2Fe is the balanced equation

Where does the energy from the nuclear reaction go?

Answers

The energy fro the nuclear reaction go on to split other nearby atoms

I hope that's help !

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