Which of the following are observations? Select all that apply.

Dominik [7]

Answer:

Monsoon seasonal diseases can be avoided by keeping surroundings clean, removing stagnant water, eating homemade food, washing hands properly, eating clean and drinking boiled water.

Explanation:

1. Make efforts in making the environment mosquito free by proper cleaning and removing stagnant water as well.

2. Use mosquito repellant, mainly net that has no side effects and is ecofriendly.

3. Avoid moving to crowded places to prevent viral infections.

4. Consume food made at home and boiled water.

5. Wash hands before consuming food.

4 0

3 years ago

Is hand washing a chemicals change or physicals change and why?

PolarNik [594]

Answer:

If you wash your hands with soap, the soap molecules act as a link between the water you're washing with and the oil on your skin.

Explanation:

4 0

2 years ago

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15 pts The drop down items have the same options for all sections labeled choose an item

tia_tia [17]

Answer:

#8 : 21.5 L of CH₄

#9 : 36 g of H₂O

#9 : 5.4 x 10²² molecules of CO₂

Explanation:

#8 : Part 1.

Data given:

no. of moles of CH₄ = 0.960 mol

volume of CH₄ = ?

Solution

volume can be calculated by following formula

No. of moles = Volume of gas / molar volume

Rearrange the above equation

Volume of gas = No. of moles x molar volume . . . . . . (1)

Where

molar volume = 22.4 L/mol

Put values in equation 1

Volume of gas = 0.960 mol x 22.4 L/mol

Volume of gas = 21.5 L

So,

By calculation 0.960 moles have 21.5 L volume of CH₄

_______________

#9 : Part 2.

Data given:

no. of moles of H₂O = 2.0 mol

mass of H₂O = ?

Solution

volume can be calculated by following formula

No. of moles = mass in grams / molar mass

Rearrange the above equation

mass in grams = No. of moles x molar mass . . . . . . (2)

Where

molar mass of H₂O = 2 (1) + 16

molar mass of H₂O = 18 g/mol

Put values in equation 2

mass in grams = 2.0 mol x 18 g/mol

mass in grams = 36 g

So,

By calculation 2.0 moles have 36 g mass of H₂O

________________

#10 : Part 3.

Data given:

volume of CO₂ = 2 L

no. of molecules of CO₂ = ?

Solution

First we have to find out number of moles of CO₂

Following formula will be used

No. of moles = Volume of gas / molar volume

Where

molar volume = 22.4 L/mol

Put values in above equation

No. of moles = 2 L / 22.4 L/mol

No. of moles = 0.0893 mol

So,

No. of moles of CO₂ = 0.0893 mol

Now

we will calculate number of molecules by using following formula

No. of moles = no. of molecules / Avogadro's number

Rearrange the above equation

no. of molecules = No. of moles x Avogadro's number . . . . . . (3)

Where

Avogadro's number = 6.022 x 10²³

Put values in above equation 3

no. of molecules = 0.0893 mol x 6.022 x 10²³

no. of molecules = 5.4 x 10²²

So,

By calculation 2 L of CO₂ have 5.4 x 10²² molecules of CO₂

8 0

3 years ago

What is the smallest division on this balance? 0.005 g 0.001 g 0.01 g 0.1 g

Kaylis [27]

The smallest division in this balance is 0.001g

5 0

3 years ago

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Allyl sulfide, C6H10S, is a compound that has the odor of garlic. How many moles of Allyl sulfide are in 125 g?

Yuki888 [10]

Considering the definition of molar mass, 1.096 moles of Allyl sulfide are in 125 g.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.

<h3>Molar mass of C₆H₁₀S</h3>

In this case, you know the molar mass of the elements is:

C= 12 g/mole
H= 1 g/mole
S= 32 g/mole

So, the molar mass of the compound C₆H₁₀S is calculated as:

C₆H₁₀S= 6× 12 g/mole + 10× 1 g/mole + 32 g/mole

Solving:

<h3>Moles in 125 g CH₂Cl₂</h3>

Next, you can apply the following rule of three: If by definition of molar mass 114 grams of the compound are contained in 1 mole, 125 grams of the compound are contained in how many moles?

$amount of moles=\frac{125 grams x 1 mole}{114 grams}$

<u><em>amount of moles= 1.096 moles</em></u>

Finally, 1.096 moles of Allyl sulfide are in 125 g.

Learn more about molar mass:

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#SPJ1

4 0

2 years ago