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malfutka [58]
3 years ago
14

Use the periodic table to answer the following question. What is the predicted order of first ionization energies from highest t

o lowest for beryllium, calcium, magnesium, and strontium? A. Be > Ca > Mg > Sr B. Be > Mg > Ca > Sr C. Ca > Sr > Be > Mg D. Sr > Ca > Mg > Be
Chemistry
2 answers:
emmainna [20.7K]3 years ago
7 0

Answer:

The order is determined as: Be > Mg > Ca > Sr (option B)

Explanation:

The electrons are attracted to the nucleus and it is necessary to provide energy to start them. The ionization energy I is then the energy needed to start an electron to a gaseous atom, isolated and in a fundamental state. The electrons of the last layer are always lost, which are the weakest attracted to the nucleus.

The elements beryllium, calcium, magnesium and strontium, if you place them in the periodic table, are in the same group. In the same group, the size of the atoms increases as they descend in the periodic table. In this way, electrons are found in layers increasingly distant from the nucleus, being less and less attracted to it. This facilitates its extraction from the atom. Finally, the ionization energy decreases as it descends in a group.  Following this criterion, the order is determined as: Be > Mg > Ca > Sr (option B)

Degger [83]3 years ago
6 0

B. Be > Mg > Ca > Sr

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Given the following proposed mechanism, predict the rate law for the rate-determining step.
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Answer:

D) Rate = K [NO2][Cl2]

Explanation:

2 NO2 + Cl2 → 2 NO2Cl (overall reaction)

NO2 + Cl2 → NO2Cl + Cl (slow)

NO2 + Cl → NO2Cl (fast)

The rate-determining step is the slowest step in a reaction mechanism. Because it is the slowest, it determines the rate of the overall reaction.

Rate of reaction is typically given as;

Rate = K [Reactants]

In the slow step i the reaction mechanism, the reactants are; NO2 and Cl2. Since both are not intermediates, there is no need for further working out.

Rate = K [NO2][Cl2]

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3 years ago
What has to be true in order for a single replacement reaction to happen?
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Answer: A

Explanation:

One element replaces another in a compound.

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2 years ago
Which three forces can affect an object without contact?
gavmur [86]

Answer:

gravity, magnetic, electrostatic

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3 years ago
7th grade science , please don’t get the answer from the internet :(
Liula [17]

Answer:

See the answer below

Explanation:

1. Organisms produce energy for cells by chemically breaking down and unlocking the energy locked-up within food materials in a process known as cellular respiration. The unlocked energy is then utilized for the cell's metabolic activities.

2. Cellular respiration can be aerobic or anaerobic.

Aerobic respiration involves the breakdown of carbohydrates in the presence of oxygen to yield energy in the form of ATP while carbon dioxide and water are produced as by-products.

        C_6H_1_2O_6 + 6O_2 --> 6CO_2 + 6H_2O + ATP

Anaerobic respiration involves the breakdown of carbohydrates in the absence of oxygen to produce ATP and lactic acid as a by-product. The lactic acid is later oxidized to carbon dioxide and water to prevent it from building up.

       C_6H_1_2O_6 -> 2C_3H_6O_3 + ATP

3. Photosynthesis and cellular respiration are both considered metabolic processes that take place in living organisms. However, photosynthesis is peculiar only to green plants and some algae while respiration is common to all living organisms. While photosynthesis is anabolic, that is, it involves the building up of materials; respiration is said to be catabolic because it involves the breaking down of materials.

During photosynthesis, inorganic products are utilized to produce carbohydrates for plants with oxygen gas released as a by-product according to the following equation:

       6CO_2 + 6H_2O --> C_6H_1_2O_6 + 6O_2

During respiration, the food taken by living organisms is broken down to unlock the energy in it for metabolic activities according to the following equation:

     C_6H_1_2O_6 + 6O_2 --> 6CO_2 + 6H_2O + ATP

7 0
3 years ago
CaCO3 → CaO + CO2 Calculate the theoretical yield of Calcium Oxide if 24.8 grams of Calcium Carbonate decomposes. Calculate the
RideAnS [48]

Answer:

Theoretical yield: 13.9 g

Percent yield: 94 %

Explanation:

The reaction is:

CaCO₃ → CaO + CO₂

We see that the reaction is correctly balanced.

1 mol of calcium carbonate can decompose to 1 mol of calcium oxide and 1 mol of carbon dioxide.

We convert the mass to moles: 24.8 g . 1mol / 100.08g = 0.248 moles

As ratio is 1:1, 0.248 moles of salt can decompose to 1 mol of oxide.

We convert the moles to mass: 0.248 mol . 56.08g /1mol = 13.9 g

That's the theoretical yield.

To determine the percent yield we think:

(Determined yield / Theoretical yield) . 100 → (13.1 / 13.9) . 100 = 94 %

5 0
3 years ago
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