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jenyasd209 [6]
3 years ago
15

What Group is Zn (zinc) in? O A. 4 O B. 2A O C. 12 O D. 30

Chemistry
1 answer:
Oxana [17]3 years ago
3 0
I believe it’s (C.12)
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In a pure metal, the electrons can be thought of as [ Select ] throughout the metal. Using molecular orbital theory, there [ Sel
Phoenix [80]

Answer:

Explanation:

In a pure metal, the electrons can be thought of as [concentrated] around atoms throughout the metal. Using molecular orbital theory, there [is ] an energy gap between the filled molecular orbitals and empty molecular orbitals. The [antibonding] orbitals are typically higher in energy and are mostly (filled]

5 0
3 years ago
1. What % of the nation's energy is used by the Industrial<br> Sector?
kari74 [83]

Answer:

Petroleum:92 Percent

Natural Gas:3 Percent

Renewable energy:5 Percent

Explanation:

US primary energy consumption by source and sector (2017)[17]

Supply sources Percent of source Demand sectors Percent of sector

Petroleum

36.2% 72% Transportation

23% Industrial

5% Residential and commercial

1% Electric power Transportation

28.1% 92% Petroleum

3% Natural gas

5% Renewable energy

Natural gas

28.0% 3% Transportation

35% Industrial

28% Residential and commercial

34% Electric power Industrial

21.9% 38% Petroleum

45% Natural gas

5% Coal

12% Renewable energy

Coal

13.9% 9% Industrial

<1% Residential and commercial

91% Electric power Residential and commercial

10.4% 16% Petroleum

76% Natural gas

<1% Coal

8% Renewable energy

Renewable energy

11.0% 13% Transportation

23% Industrial

7% Residential and commercial

57% Electric power Electric power

37.2% 1% Petroleum

26% Natural gas

34% Coal

17% Renewable energy

23% Nuclear electric power

Nuclear electric power

8.4% 100% Electric power  

3 0
3 years ago
Photosynthesis is a cell process used by various organisms. Which of the following best
Dmitry [639]

Answer:

Carbon dioxide and water are turned into sugar and oxygen

3 0
3 years ago
When a chemical reaction is run in aqueous solution inside a calorimeter, the temperature change of the water (and Ccal) can be
Yakvenalex [24]

Answer:

The total change in enthalpy for the reaction is - 81533.6 J/mol

Explanation:

Given the data in the question;

Reaction;

HCl + NaOH → NaCl + H₂O

Where initial temperature is 21.2 °C and final temperature is 28.0 °C. Ccal is 1234.28 J

Moles of NaOH  = 50.mL × 1.00 M = 50.0 mmol = 0.0500 mol

Moles of HCl = 50.mL × 1.00 M = 50.0 mmol = 0.0500 mol

so, 0.0500 moles of H₂O produced

Volume of solution = 50.mL  +  50.mL  = 100.0 mL

Mass of solution m = volume × density = 100.0mL × 1.0 g/mL = 100 g

now ,

Heat energy of Solution q= (mass × specific heat capacity × temp Δ) + Cal

we know that; The specific heat of water(H₂O) is 4.18 J/g°C.

so we substitute

q_soln = (100g × 4.18 × ( 28.0 °C - 21.2 °C) ) + 1234.28

q_soln = 2842.4 + 1234.28

q_soln = 4076.68 J

Enthalpy change for the neutralization is ΔH_{neutralization}

ΔH_{neutralization} = -q_soln / mole of water produced

so we substitute

ΔH_{neutralization} = -( 4076.68 J ) / 0.0500 mol  

ΔH_{neutralization} = - 81533.6 J/mol

Therefore, the total change in enthalpy for the reaction is - 81533.6 J/mol

6 0
3 years ago
Which inorganic substance taken up by plants is also taken in and used directly by animals, including humans?
masha68 [24]

Answer: water

water can not be organic...but is is took by humans and plants because theur life dpends on it

Explanation:

3 0
3 years ago
Read 2 more answers
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