Consider three devices operating connected at steady state: a pump, a boiler, and

Which of the following was most likely NOT present in creating the amino acids of early Earth's water of the past? A. ammonia B.

Igoryamba

B or D but id say go with D

7 0

3 years ago

Read 2 more answers

What is the difference between covalent bonding and electrovalent bonding

Rudiy27

Answer:

1 ) Electrovalent compounds are formed by the complete transfer of electrons while covalent compounds are formed by sharing of electrons between 2 atoms.

2) Electrovalent compounds are more soluble in polar solvents like water while covalent compounds are more soluble in non-polar solvents like methane.

5 0

3 years ago

35 points to help me i wrote the definition up top for this i just need help using it in a Example/Sentence

dmitriy555 [2]

In order for a cellular device to operate, it requires battery power, otherwise known as energy.

or you can do this

Us humans consume food so that we can have the sufficient energy to accomplish tasks.

5 0

3 years ago

When 25.0 ml of 0.500 m h2so4 is added to 25.0 ml of 1.00 m koh in a coffee-cup calorimeter at 23.50°c, the temperature rises to

AlladinOne [14]

The chemical reaction that occurs between the given substances is a neutralization reaction as shown below :

H_2SO_4 + 2KOH -> K_2SO_4 + 2H_2O

1 mol 2 mol 1 mol 2 mol

The number of moles of the given substances is calculated as shown :

Number of moles of H_2SO_4 = 25.0 mL x 0.50 M = 12.5 millimoles

Number of moles of KOH = 25.0 mL x 1.00 M = 25.0 millimoles

As 1 mol of sulfuric acid reacts with 2 mol of KOH to give 2 mol of water, 12.5 millimoles of sulfuric acid completely reacts with 25.0 millimoles of KOH to give 25.0 millimoles of water.

Total volume of the solution = 25.0 mL + 25.0 mL = 50.0 mL.

Density of water is 1 g/mL. Use this to calculate the mass of the solution.

Mass of the solution – 50.0 mL x 1 g/mL = 50.0

The specific heat of water is 4.184 J/gK. The temperature of the solution is increased from 23.5 degrees Celsius to 30.17 degrees Celsius.

The amount of heat released = 4.184 J/gK x 50.0 g x (30.17C – 23.50C) 1395 J

The amount of heat released per one mole of water formed can be calculated as shown :

The amount of heat released for formation of mole water = 1395 J / (25.0 m mol x 1mol/1000 m mol)

= 55,800 J

8 0

3 years ago

1. Calculate the quantity of glucose needed to prepare (a) 250 mL of a 100 mM of

weeeeeb [17]

Answer:

a. mass of glucose required = 4.50 g

b. mass of glucose required = 0.05 g

c. mass of glucose required = 25g

Explanation:

1a. molar mass of glucose = 180.156 g/mol

volume of solution = 250 mL or 250 mL * 1 L/1000 mL = 0.25 L

concentration of solution = 100 mM or 100mM * 1 M/1000 mM = 0.10 M

amount in moles = mass/ molar mass = concentration * volume

mass in grams = concentration * volume * molar mass

mass = 0.10 * 0.25 * 180.156

mass of glucose required = 4.50 g

b. mass concentration of 0.05 % solution = 0.05 g/100 ml = 0.5 g/L

volume of solution = 100 mL = 0.1 L

mass in grams = mass concentration * volume

mass in grams = 0.5 g/L * 0.1 L

mass of glucose required = 0.05 g

c. mass concentration of solution = 50 mg/ mL = 0.05 g/ 0.001 L = 50 g/L

volume of solution = 500 mL = 0.5 L

mass of solute required = concentration * volume

mass required = 50 g/L * 0.5 L

mass of glucose required = 25g

7 0

3 years ago