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2 years ago

Kate and Janie are about to pour water into a beaker when they notice

Chemistry

2 answers:

SVETLANKA909090 [29]2 years ago

8 0

They should throw it away and use a different one

storchak [24]2 years ago

4 0

Answer:

Put the beaker in the broken glassware disposal and replace the beaker

Explanation:

Any beaker which has a crack could break/shatter if you apply heat. Also, cracked glassware is a lab safety hazard.

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A cylinder containing 14.71 L of helium gas at a pressure of 169.1 atm is to be used to fill toy balloons to a pressure of 1.086

Komok [63]

Answer:

The number of balloons is 948.8.

Explanation:

The number of balloons can be calculated as follows:

$N = \frac{V_{f}}{V_{T}}$

Where:

$V_{f}$ : is the volume at 1.086 atm

$V_{T}$ : is the balloon volume = 2.414 L

The volume at 1.086 atm can be found using Boyle's law:

$P_{i}V_{i} = P_{f}V_{f}$

$V_{f} = \frac{P_{i}V_{i}}{P_{f}} = \frac{169.1 atm*14.71 L}{1.086 atm} = 2290.5 L$

Now, the number of balloons is:

$N = \frac{V_{f}}{V_{T}} = \frac{2290.5 L}{2.414 L} = 948.8$

Therefore, the number of balloons is 948.8.

I hope it helps you!

3 0

3 years ago

I need the answers any help can be good

aleksandrvk [35]

2.a)R b)R c)L d)L e)R f)L g)L

8 0

3 years ago

An organic fertiliser in which plants are ploughed back into the soil

Evgen [1.6K]

Answer:

It was called MANURE

Explanation:

Its a type of fertilizer which plant are ploughed back into the soil.

GOOD LUCK

7 0

3 years ago

How many atoms of carbon are represented in 3CH3CH2O? 2 4 6 8

GenaCL600 [577]

Answer: 6

Explanation:

1) The structure shown is:

3CH₃CH₂O

2) The molecule is CH₃CH₂O. The chemical formula is CH₃CH₂O. The subscripts indicate the number of atoms of the corresponding atom in each molecule.

Then, there are 1 + 1 = 2 atoms of C, 3+ 2 = 5 atoms of H, and 1 atom of O.

3) The number in front of the molecule is the coefficient. It is 3, and it tells the number of molecules.

So, there are 3 molecules, which means that you have 3 times a many atoms as calculated previously.

That is 3×2 = 6 atoms of C, 3 × 5 = 15 atoms of H, and 3 × 1 = 3 atoms of O.

Then, the number of atoms of carbon (C) in 3 molecules is 6

4 0

3 years ago

1. Ibuprofen (C13H18O2) is the active ingredient in many nonprescription pain relievers. Each tablet contains 200 mg of ibuprofe

Dmitry_Shevchenko [17]

Answer :

The molar mass of ibuprofen is, 206.29 g/mole.

The number of moles of ibuprofen in a single tablet is, 0.000969 moles

The number of moles of ibuprofen in four doses is, 0.007752 moles

Solution : Given,

Molar mass of carbon = 12.01 g/mole

Molar mass of hydrogen = 1.01 g/mole

Molar mass of oxygen = 15.99 g/mole

1) Now we have to calculate the molar mass of ibuprofen.

Molar mass of ibuprofen, $C_{13}H_{18}O_2$ = $(13\times 12.01)+(18\times 1.01)+(2\times 15.99)=206.29g/mole$

The molar mass of ibuprofen = 206.29 g/mole

2) Now we have to calculate the moles of ibuprofen.

Formula used : $Moles=\frac{Mass}{\text{ Molar mass}}$

Given : Mass of ibuprofen = 200 mg = 0.2 g (1 mg = 1000 g)

$\text{ Moles of ibuprofen}=\frac{\text{ Mass of ibuprofen}}{\text{ Molar mass of ibuprofen}}=\frac{0.2g}{206.29g/mole}=0.000969moles$

The moles of ibuprofen = 0.000969 moles

3) Now we have to calculate the number of moles of ibuprofen for four doses.

Number of tablets in one dose = 2

Total number of tablets in 4 doses = 4 × 2 = 8

Number of moles of ibuprofen in 8 tablets =

$\text{ Number of moles of ibuprofen in 1 tablet}\times \text{ Total number of tablets}=0.000969\times 8=0.007752moles$

6 0

3 years ago

Read 2 more answers