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Chemistry

Step-by-step answer

Answer: chalcogens.

Explanation: Strontium is an alkaline earth metal, it always exhibits a degree of oxidation in its compounds +2.

Chalcogens are a group of 6 chemical elements (oxygen O, sulfur S, selenium se, tellurium te, polonium Po) that have an oxidation state of -2 => Chalcogens will combine with strontium in a ratio of 1:1.

Explanation: Strontium is an alkaline earth metal, it always exhibits a degree of oxidation in its compounds +2.

Chalcogens are a group of 6 chemical elements (oxygen O, sulfur S, selenium se, tellurium te, polonium Po) that have an oxidation state of -2 => Chalcogens will combine with strontium in a ratio of 1:1.

Chemistry

Step-by-step answer

Answer: b. Fiona is correct because the diagram shows two individual simple machines.

Explanation:

A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.

For example, in the given diagram there are two individual simple machines.

The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.

Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.

Explanation:

A mechanical device using which we can change the direction or magnitude of force applied is known as simple machine.

For example, in the given diagram there are two individual simple machines.

The machine helps in changing the direction or magnitude of force applied by the man. As a result, it becomes easy for him to carry different things easily from one place to another.

Thus, we can conclude that the statement Fiona is correct because the diagram shows two individual simple machines, is correct.

Chemistry

Step-by-step answer

**Answer:**

**Step-by-step explanation:**

It is clear by the equation 2(27+3×35.5)= 267 gm of AlCl3 reacts with 6× 80 = 480 gm of Br2 . So 29.2 gm reacts = 480× 29.2/267= 52.6 gm

Chemistry

Step-by-step answer

Calcium (Ca)(On the periodic table, ionization energy increases as you go up and to the right of the periodic table)

Chemistry

Step-by-step answer

glycoproteins

Explanation:

A positive reaction for Molisch's test is given by almost all carbohydrates (exceptions include tetroses & trioses). It can be noted that even some glycoproteins and nucleic acids give positive results for this test (since they tend to undergo hydrolysis when exposed to strong mineral acids and form monosaccharides).

Chemistry

Step-by-step answer

15 moles.Explanation:Hello,In this case, the undergoing chemical reaction is:Clearly, since carbon and oxygen are in a 1:1 molar ratio, 15 moles of carbon will completely react with 15 moles of oxygen, therefore 15 moles of oxygen remain as leftovers. In such a way, since carbon and carbon dioxide are also in a 1:1 molar ratio, the theoretical yield of carbon dioxide is 15 moles based on the stoichiometry:Best regards.

Chemistry

Step-by-step answer

Answer: 25 g

Explanation: Given:

Original amount (N₀) = 100 g

Number of half-lives (n) = 11460/5730 = 2

Amount remaining (N) = ?

N = 1/2ⁿ × N₀

N = 1/2^2 × 100

N = 0.25 × 100

N = 25 g

Explanation: Given:

Original amount (N₀) = 100 g

Number of half-lives (n) = 11460/5730 = 2

Amount remaining (N) = ?

N = 1/2ⁿ × N₀

N = 1/2^2 × 100

N = 0.25 × 100

N = 25 g

Chemistry

Step-by-step answer

Answer: 7.8125 g

Explanation: Given:

Original amount (N₀) = 500 g

Number of half-lives (n) = 9612/1602 = 6

Amount remaining (N) = ?

N = 1/2ⁿ × N₀

N = 1/2^6 × 500

N = 0.015625 × 500

N = 7.8125 g

Explanation: Given:

Original amount (N₀) = 500 g

Number of half-lives (n) = 9612/1602 = 6

Amount remaining (N) = ?

N = 1/2ⁿ × N₀

N = 1/2^6 × 500

N = 0.015625 × 500

N = 7.8125 g

Chemistry

Step-by-step answer

Answer: B. carbon tetrachloride, CCI4

Explanation: The other options are incorrect. Let's write the correct formulas:

A. Diarsenic pentoxide - As2O5

C. Sodium dichromate - Na2Cr2O7

D. magnesium phosphide - Mg3P2

Explanation: The other options are incorrect. Let's write the correct formulas:

A. Diarsenic pentoxide - As2O5

C. Sodium dichromate - Na2Cr2O7

D. magnesium phosphide - Mg3P2

Chemistry

Step-by-step answer

Answer: 306 L

Explanation: Using the ideal gas law,

PV = nRT

where R = 0.08206 L•atm/(mol•°K), solving for n gives

n = PV/(RT)

n = (845 mmHg) (270 L) / ((0.08206 L•atm/(mol•°K)) (24 °C))

Convert the given temperature to °K and the given pressure to atm:

24 °C = (273.15 + 24) °K ≈ 297.2 °K

(845 mmHg) × (1/760 atm/mmHg) ≈ 1.11 atm

Then the balloon contains

n = (1.11 atm) (270 L) / ((0.08206 L•atm/(mol•°K)) (297.2 °K))

n ≈ 12.3 mol

of He.

Solve the same equation for V :

V = nRT/P

Convert the target temperature to °K:

-50 °C = (273.15 - 50) °K = 223.15 °K

Then the volume under the new set of conditions is

V = (12.3 mol) (0.08206 L•atm/(mol•°K)) (223.15 °K) / (0.735 atm)

V ≈ 306 L

Explanation: Using the ideal gas law,

PV = nRT

where R = 0.08206 L•atm/(mol•°K), solving for n gives

n = PV/(RT)

n = (845 mmHg) (270 L) / ((0.08206 L•atm/(mol•°K)) (24 °C))

Convert the given temperature to °K and the given pressure to atm:

24 °C = (273.15 + 24) °K ≈ 297.2 °K

(845 mmHg) × (1/760 atm/mmHg) ≈ 1.11 atm

Then the balloon contains

n = (1.11 atm) (270 L) / ((0.08206 L•atm/(mol•°K)) (297.2 °K))

n ≈ 12.3 mol

of He.

Solve the same equation for V :

V = nRT/P

Convert the target temperature to °K:

-50 °C = (273.15 - 50) °K = 223.15 °K

Then the volume under the new set of conditions is

V = (12.3 mol) (0.08206 L•atm/(mol•°K)) (223.15 °K) / (0.735 atm)

V ≈ 306 L

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