In which type of reaction do two or more substances combine to produce a single substance?(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement

Answers

Answer 1

Answer: The correct answer is option 1. Synthesis reaction is the chemical reaction which involves two or more substances combining to form a single substance. An example is burning magnesium. The balanced reaction is 2Mg + O2 = 2MgO.

Answer 2

Answer:

The correct answer is (1) Synthesis

Explanation:

In chemistry, synthesis reaction occurs as two or more substance combine and form a single and complex product, due to this, synthesis reaction is also known as a direct combination, because different to decomposition or replacement reactions the final product includes the substances that were combined. For example, water (H2O) is formed through synthesis by mixing two atoms of hydrogen (H2) and one of Oxygen (H) which means the substances combined form a single substance. Thus, the type of reaction described is Synthesis reaction.

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Approximately how long has the Moon been geologically inactive?A. 1 billion years
B. 3 billion years
C. 4 billion years
D. 4.5 billion years

Answers

The moon had been geologically inactive for B. 3 billion years

Describe 3 ways that you could change the rate of the reaction based on principles that effect rates of reactions.

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Three ways to change the rate of a reaction are by increasing the concentration of reactants, changing the temperature, and adding a catalyst.

Three ways to change the rate of a reaction:

Increasing the concentration of reactants: This increases the collision frequency between particles, leading to a higher reaction rate. For example, in the reaction between hydrogen and iodine to form hydrogen iodide, increasing the concentration of hydrogen and iodine will speed up the reaction.
Changing the temperature: Higher temperatures increase the kinetic energy of particles, making them move faster and collide more frequently. This results in a faster reaction rate. Using an example, raising the temperature of the reaction between magnesium and hydrochloric acid will speed up the rate of reaction.
Adding a catalyst: Catalysts are substances that speed up reactions by providing an alternative reaction pathway with lower activation energy. For instance, adding an enzyme catalyst like amylase to the reaction between starch and iodine will increase the reaction rate.

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The three main ways to change the rate of reaction based on principles that affect rates of reactions are concentration, temperature, and catalysts .let us describe them one by one further.

Three ways to change the rate of a chemical reaction are:

Concentration Change: Increasing the concentration of reactants usually speeds up the reaction. This is due to more frequent collisions between particles, increasing the likelihood of successful collisions leading to product formation.
Temperature Change: Raising the temperature accelerates reactions by providing more energy to reactant particles, increasing their kinetic energy, and promoting successful collisions.
Catalysts: Adding a catalyst lowers the activation energy required for the reaction, making it easier for reactants to transform into products. Catalysts provide an alternate reaction pathway, allowing reactions to occur at lower energy levels and faster rates.

Answers

(46x8.0)+(47x7.8)+(48x73.4)+(49x5.5)+(50x5.3) = 4792.3

4792.3/100 = 47.923 this is the average atomic mass of Titanium

Final answer:

The average atomic mass of titanium, calculated by weighting each isotope's mass by its percent abundance, is approximately 47.923 atomic mass units (amu). This aligns closely with the atomic mass on the periodic table of 47.867 amu.

Explanation:

The average atomic mass of titanium can be calculated by weighting each isotope's mass by its percent abundance, which is essentially what an 'average' is. Here is how each isotope of titanium contributes to the average atomic mass:

46Ti: 46 amu * 0.08 = 3.68 amu
47Ti: 47 amu * 0.078 = 3.666 amu
48Ti: 48 amu * 0.734 = 35.232 amu
49Ti: 49 amu * 0.055 = 2.695 amu
50Ti: 50 amu * 0.053 = 2.65 amu

Adding it all up: 3.68 amu + 3.666 amu + 35.232 amu + 2.695 amu + 2.65 amu = 47.923 amu. Therefore, the calculated average atomic mass of titanium is approximately 47.923 amu, which aligns closely with the atomic mass on the periodic table of 47.867 amu.

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What is true at STP? 1) Temperature is 295 Kelvin.
2) One mole of gas occupies a volume of one liter.
3) Pressure is 1.0 atmosphere.
4) Volume is 2.4 liters

Answers

The correct answer for the question that is being presented above is this one: "3) Pressure is 1.0 atmosphere." STP stand for standard temperature and pressure. The values of STP are 22.4 liters, 1mole, 1.00 atmospheres, and 273 kelvin. Under these conditions, all gases behave ideally or the same.

The breakdown of glucose is linked to cellular work by a chemical driveshaft known as

Answers

Answer:

ATP

Explanation:

Calculate the wavelength, in nanometers, of the light emitted by a hydrogen atom when its electron falls from the n = 7 to the n = 4 principal energy level. Recall that the energy levels of the H atom are given by En = –2.18 × 10–18 J(1/n2)

Answers

Answer:

The wavelength of the light emitted by electron fall will be 216.62 nm.

Explanation:

The change in the energy state of the matter can be obtained from the principal quantum number of the shells.

Energy of 4th shell - Energy of 7th shell = $\rm \Delta$ E

$\Delta$ E = $\rm 2.18\;*\;10^-^1^8\;J\;\left ( (1)/(n_f^2) \;-\;(1)/(n_i^2) \right )$

$\rm \Delta\;E\;=\;-2.18\;*\;10^-^1^8\;\left ((1)/(4^2) \;-\;(1)/(7^2) \right )$

$\rm \Delta\;E\;=\;-2.18\;*\;10^-^1^8\;*\;0.0421$

$\rm \Delta\;E\;=\;0.0917\;*\;10^-^1^8$ J

The wavelength can be calculated as:

$\rm \Delta\;E\;=\;(hc)/(\lambda)$

where, h is Plank's constant,

c is speed of light

$\lambda$ is the wavelength

$\rm 0.0917\;*\;10^-^1^8\;J\;=\;(6.626\;*\;10^-^3^4\;J.s\;*\;2.998\;*\;10^8\;m/s)/(\lambda)$

$\rm\lambda\;=\;216.62nm$ .

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Answer:

The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.

Explanation:

The energy of nth energy levels of the H atom is given as:

$E_n = -2.18 * 10^(-18) * (1)/(n^2) J$

Energy of the seventh energy level = $E_7$

$E_7=-2.18 * 10^(-18) * (1)/(7^2) J$

$E_7=-2.18 * 10^(-18) * (1)/(7^2) J=-4.4490* 10^(-20) J$

Energy of the seventh energy level = $E_4$

$E_4=-2.18 * 10^(-18) * (1)/(4^2) J$

$E_4=-2.18 * 10^(-18) * (1)/(16) J=-1.3625* 10^(-19) J$

Energy of the light emitted will be equal to the energy difference of the both levels.

$E=E_7-E_4=-4.4490* 10^(-20) J-(-1.3625* 10^(-19) J)$

$E=9.176* 10^(-20) J$

Wavelength corresponding to energy E can be calculated by using Planck's equation:

$E=(hc)/(\lambda )$

$\lambda =(hc)/(E)=(6.626* 10^(-34) Js* 3* 10^8 m/s)/(9.176* 10^(-20) J)=2.166* 10^(-6) m=2166 nm$

The wavelength of the light emitted by a hydrogen atom for the given transition is 2166 nm.

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In which type of reaction do two or more substances combine to produce a single substance?(1) synthesis (2) decomposition (3) single replacement (4) double replacement

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Final answer:

Explanation:

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In which type of reaction do two or more substances combine to produce a single substance?(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement