Sound waves entering the ear first strike the .

hammer,anvil,eardrum,cochlea

Answers

Answer 1
Answer: I believe it is the Eardrum, Hammer, Anvil then Cochlea. 

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Which pair of compounds are isomers?(1) NO2 and N2O4
(2) P2O5 and P4O10
(3) HCOOH and CH3COOH
(4) CH3OCH3 and C2H5OH

Answers

Answer: CH_3OCH_3 and C_2H_5OH

Explanation: The compounds having similar molecular formula but different arrangement of atoms or groups in space are called isomers and the phenomenon is called as isomerism.

CH_3OCH_3 and C_2H_5OH are functional isomers which have same molecular formula but different functional groups attached.

(1) NO_2 and N_2O_4 are different compounds.

(2)  P_2O_5 and P_4O_(10) are different compounds.

(3) HCOOH and CH_3COOH are different compounds.

CH3OCH3 and C2H5OH are isomers. They have same molecular formula. But with another formation. 

Which unit is used to express the pressure of a gas?

Answers

According to the International System of Units, the unit of pressure is pascal (Pa). However, in calculating, we use atmosphere (atm), which is also a unit of pressure, more often. 
Hope this helps~
The unit used to express the pressure of gas is the pascal. 

A substance conducts an electric current when it is in the liquid state. What would the conductivity of the substance in solid form indicate about the type of bond in the substance?A.) If the solid is conductive, the bonds are ionic.
B.) If the solid is not conductive, the bonds are covalent.
C.) If the solid is conductive, the bonds are metallic.
D.) If the solid is not conductive, the bonds are metallic.

Answers

Answer is: C.) If the solid is conductive, the bonds are metallic.

1) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

2) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.

3) Substances with metallic  bond conduct an electric current in liquid and solid state, because they have mobile electrons. Most metals have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.

Answer:C.) If the solid is conductive, the bonds are metallic.

Explanation:

The four tastes are:
bitter
sour
fishy
salty
fruity
sweet

Answers

bitter, sour, salty, sweet.

What are the intermolecular force in glycerin

Answers

Carbon to hydrogen single, double or triple bond as intramolecular forces and is famous for forming ester linkages (intermolecular) as it is an alchol.

What is the mass of 3.0 x 10^23 atoms of neon

Answers

The mass of 3.0 x 10^23 atoms of neon would be 10.09 g

According to Avogadro;

1 mole of neon would have 6.022 x 10^23 atoms

3.0 x 10^23 atoms of neon would have:

            3.0 x 10^23/6.022 x 10^23

                                         = 0.5 moles

mass of 0.5 moles neon = mole x molar mass

                                            = 0.5 x 20.18

                                             = 10.09 g

More on Avogadro number can be found here: brainly.com/question/1445383?referrer=searchResults

Answer: The mass of neon for the given number of atoms will be 9.8 g.

Explanation:

We are given:

Number of neon atoms = 3.0* 10^(23)

According to the mole concept:

6.022* 10^(23) number of atoms. are occupied in 1 mole of a substance.

So, 3.0* 10^(23) will be occupied in = (1)/(6.022* 10^(23))* 3.0* 10^(23)=0.49moles

To calculate the number of moles, we use the equation:

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

Moles of Neon = 0.49 moles

Molar mass of neon = 20 g/mol

Putting values in above equation, we get:

0.49mol=\frac{\text{Mass of neon}}{20g/mol}\n\n\text{Mass of neon}=9.8g

Hence, the mass of neon for the given number of atoms will be 0.49g.