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4 years ago

Winds generally move from areas of _ to areas of ____.

Chemistry

2 answers:

Mekhanik [1.2K]4 years ago

5 0

The answer to question 1 is B and to question 2 is A

Lilit [14]4 years ago

3 0

The first is B and A, the second is D

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Choose three different items that are magnetic.

Anton [14]

Answer: magnet, fridge and uh......metal

Explanation:

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3 years ago

Read 2 more answers

Compared to the ideal bond angle, the actual/real bond angle in a molecule of water will be:______.

inna [77]

Answer: d. smaller.

Explanation:

Hybridization :

$N=\frac{1}{2}[V+N+A-C]$

N = number of electrons

where, V = number of valence electrons present in central atom i.e. oxygen = 6

N = number of monovalent atoms bonded to central atom=32

C = charge of cation = 0

A = charge of anion = 0

The number of electrons is 4 that means the hybridization will be $sp^3$ and the electronic geometry of the molecule will be tetrahedral. The bond angle for tetrahedral geometry is $109.5^0$

But as there are two atoms around the central oxygen, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent and the bond angle will be smaller than expected and is $104.5^0$

8 0

3 years ago

How much heat is needed to raise the temperature of 50g of a substance by 15c when the specific heat is 0.92?

kirill [66]

The heat needed to raise the temperature of 50g of substance by 15 c is calculated as follows

Heat = mc delta T

m= mass (50g)
c= specific heat capacity (0.92)
delta T= change in temperature( 15 c)

heat is therefore= 50 x 0.92 x 15 = 690

Nb: my answer has no units since the given specific heat capacity has no units

8 0

4 years ago

A particular oral contraceptive contains 0.038 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. H

Ray Of Light [21]

<u>Answer:</u> The number of molecules of ethinyl estradiol present in one pill are $7.71\times 10^{16}$

<u>Explanation:</u>

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

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

Given mass of ethinyl estradiol = 0.038 mg = $3.8\times 10^-5}g$ (Conversion factor: 1 g = 1000 mg)

Molar mass of ethinyl estradiol $(C_{20}H_{24}O_2)=[(20\times 12)+(24\times 1)+(2\times 16)]=296g/mol$

Putting values in above equation, we get:

$\text{Moles of ethinyl estradiol}=\frac{3.8\times 10^{-5}g}{296g/mol}=1.28\times 10^{-7}mol$

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules

So, $1.28\times 10^{-7}mol$ of ethinyl estradiol will contain = $(1.28\times 10^{-7}\times 6.022\times 10^{23})=7.71\times 10^{16}$ number of molecules

Hence, the number of molecules of ethinyl estradiol present in one pill are $7.71\times 10^{16}$

5 0

3 years ago

Determine how many moles are present in 0.23kg of SO(2)

Rama09 [41]

Answer:

3.59 moles

Explanation:

Hopefully this helps! :)

Mark as brainliest if right!

6 0

3 years ago

Winds generally move from areas of _____________ to areas of ________________.

Winds generally move from areas of _ to areas of ____.