When a covalent bond forms between atoms, electrons are a. lost.
b. gained.
c. shared.
d. transferred.?

Answers

Answer 1

Answer: in covalent bonds electrons are shared

Answer 2

Answer:

Covalent bonds share electrons while ionic bonds transfer their electrons.

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mixture or pure substance: 1.blood 2.dyes 3.self-raising flour 4.muesli 5.copper wire 6.distilled water 7.table salt 8.milk 9.bronze 10.tea 11.oxygen 12.air

Answers

Answer: Mixture: Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance: Copper wire, distilled water, table salt, oxygen.

Explanation:

Mixture is a substance which is made up two or more number of compounds which chemically inactive and retain their distinct chemical properties.

Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance is defined as anything with uniform and unchanging composition is known s pure substance.

Copper wire, distilled water, table salt, oxygen.

What is combustion and how does it affect the carbon cycle?

Answers

combustion is burning and that usually produces carbon in the reaction adding it to the atmosphere

Which sentence contains a common allusion?O A. The meeting became extremely tense.
OB. The meeting turned into Waterloo.
O C. The meeting was held in Chicago.
OD. The meeting proceeded despite obstacles.

Answers

The sentence that is a common allusion is:

B. The meeting turned into Waterloo.

All the other choices are not considered as an allusion

What is an allusion?

It is an inferred or roundabout reference to an individual, occasion, or thing or to a piece of another text. Most references rely upon the comprehension that there is a gathering of data that is shared by the essayist and the peruser consequently. the peruser will get the author's referent.

The example of common allusion from the instances given are:

The meeting turned into Waterloo.

Find more information about Allusion here:

brainly.com/question/2427003

Answer:

Explanation:

Hydrogen sulfide burns form sulfur dioxide:2H2S(g) +3O2(g) → 2SO2(g) + 2H2O(g) ΔH= -1036 kJ

Calculate the enthalpy change when burning 26.7 g of hydrogen sulfide in kJ

pls help

Answers

Answer: 404.04 kJ.

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}$

moles of $H_2S$

$\text{Number of moles}=(26.7g)/(34.1g/mol)=0.78moles$

$2H_2S(g)+3O_2(g)\rightarrow 2SO_2(g)+2H_2O(g)$ $\Delta H=-1036kJ$

According to stoichiometry :

2 moles of $H_2S$ on burning produces = 1036 kJ

Thus 0.78 moles of $H_2S$ on burning produces = $(1036kJ)/(2)* 0.78=404.04$

Thus the enthalpy change when burning 26.7 g of hydrogen sulfide is 404.04 kJ.

The pigment which determines skin color is .

Answers

The pigment which determines skin color is Melanin

melanin , as far as I know

Which of the following requires an increase in kinetic energy?liquid ➡ solid

gas ➡ solid

gas ➡ liquid

solid ➡ gas

Answers

Answer: solid ➡ gas

Explanation:

Solid state : In this state, the molecules are arranged in regular and repeating pattern. The molecules are closely packed that means they are fixed and vibrate in place but they can not move from one place to another. and thus have least kinetic energy.

For example : Copper

Liquid state : In this state, the molecules are present in random and irregular pattern. The molecules are closely packed but they can move from one place to another.. they have intermediate kinetic energy between solids and gases.

For example : water

Gaseous state : In this state, the molecules are present in irregular pattern. The molecules are not closely packed and they can move freely from one place to another and spread out. They have highest kinetic energy.

For example : Helium gas

solid -> gas will need the increase in kinetic energy

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