CHEMISTRY HIGH SCHOOL

A snake slithers up a giant sand dune at 2 meters per second.How far will it have moved in a minute?

Answers

Answer 1
Answer: it will have traveled 120 metets
Answer 2
Answer:

Answer:

A. 120m

Explanation:

just took the test

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In a laboratory experiment, John uses a mesh to separate soil particles from water. Which technique of separation is he using?

Answers

He is using filtration technique

It's a technique which is used for separation of solids and fluids by putting them through a medium which allow only fluid to pass through, leaving the solids (in this case the soil) alone.

The fluid that passed is called the filtrate

What has to be true of a substance for it to dissolve in water?

Answers

The polarity of a water molecule comes from the uneven distribution of electron density of hydrogen and oxygen atom. The oxygen in the water molecule is more electronegative than the hydrogen. Water has a partial positive charge near the hydrogen atom and a partial negative charge near the oxygen atom. The result of this electrostatic attraction results in the bond called hydrogen bond. Also, because of this bond, it has the ability to dissolve most of the solutes due to its polarity and bonding.

How many formula units of NaNO3 are in 5.23 moles of NaNO3 (Mw. 85.00 g/mol)?

Answers

Answer:

                  3.14 × 10²⁴ Formula Units

Explanation:

                     As we know that 1 mole of any substance contains exactly 6.022 × 10²³ particles which is also called as Avogadro's Number. So in order to calculate the number of particles (formula units) contained by 5.23 moles of NaNO₃, we will use following relation,

           Moles  =  Number of F. Units ÷ 6.022 × 10²³ F. Units.mol⁻¹

Solving for Number of F. Units,

           Number of F. Units  =  Moles × 6.022 × 10²³ F. Units.mol⁻¹

Putting values,

           Number of F. Units  =  5.23 mol × 6.022 × 10²³ Molecules.mol⁻¹

           Number of F. Units  =  3.14 × 10²⁴ F. Units

Hence,

           There are 3.14 × 10²⁴ Formula Units present in 5.23 moles of NaNO₃.
85x5.23x6.02E23
=2.676191E26

The thermal transfer of energy by electromagnetic waves through the vacuum of space is called what?

Answers

Answer: Radiation

Explanation: There are three modes of heat transfer:

1. Conduction: This type of heat transfer happens when there is direct contact between the two object.

2. Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas).

3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.
Radiation i think is the correct answer

A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Answer : The number of moles of isopropanol are 1.308 moles.

Solution : Given,

Mass of isopropanol = 78.6 g

Molar mass of isopropanol = 60.1 g/mole

Formula used :

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

Now put all the given values in this formula, we get the number of moles of isopropanol.

\text{ Number of moles}=(78.6g)/(60.1g/mole)=1.308moles

Therefore, 1.308 moles of isopropanol are contained in this sample.
The thing we are asked to calculate here is the amount of the substance in the given sample in units of moles. To obtain this value, the molar mass of the substance is needed. Molar mass has the units of grams per mole so it is a useful value for converting mass into moles.

78.6 g ( 1mol / 60.1g) = 1.31 mol isopropanol

What volume of hydrogen is necessary to react with five liters of nitrogen to produce ammonia? N2 + 3H2 --> 2NH3

Answers

Volume of hydrogen required to produce ammonia = 3*5 = 15L
since, 1 mole of nitrogen reacts with 3 moles of hydrogen to produce ammonia.
Amount of ammonia produced = 2*5 = 10L as 1 mole of nitrogen produces 2 moles of ammonia
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