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3 years ago

11

Each of 7 students reported the number of movies they saw in the past year. Here is what they reported. 16,17,17,13,9,7,4 find t

he mean number of movies that the students saw

1 answer:

mixer [17]3 years ago

4 0

The answer is 11.85 but rounds up to 12

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When is a hypothesis useful in science?

fredd [130]

A hypothesis is an experimental question that can later be proven correct or incorrect by scientific evidence.

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3 years ago

During a chemical reaction, _______ and _______ are both conserved.

Alla [95]

The answer is C mass and energy

5 0

3 years ago

calculate the radius of an aluminum cylinder given the following data mass=1.22g, the density of aluminum=2.70g/cm*3 , hight=2.1

pashok25 [27]

The radius of the aluminum cylinder is 0.258cm

HOW TO CALCULATE VOLUME OF A CYLINDER:

The volume of a cylinder can be calculated by using the formula below:

V=πr²h

Where;

V = volume (cm³)

r = radius (cm)

h = height (cm)

To calculate the radius of the aluminum cylinder, the volume is required. The volume can be calculated using the formula as follows:

Volume = mass ÷ density

Volume = 1.22 ÷ 2.70

Volume = 0.452 cm³

The radius can be calculated with the volume and height known as follows:

r = √v/πh

r = √0.452 ÷ (3.142 × 2.16)

r = √0.452 ÷ 6.78

r = √0.067

r = 0.258cm

Therefore, the radius of the aluminum cylinder is 0.258cm.

Learn more: brainly.com/question/16134180?referrer=searchResults

4 0

3 years ago

CALCULATE MOLEcular mass of KMnO4

otez555 [7]

K = 39.09
Mn = 54.93
O = 15.99

KMnO4 = 39.09 + 54.93 + 15.99 x 4 => 157.98 g/mol

hope this helps!

8 0

4 years ago

Calculate %ic of the interatomic bonds for the intermetallic compound al6mn. on the basis of this result, what type of interatom

pashok25 [27]

Answer : % ionic character is 0.20%

Bonding between the two metals will be purely metallic.

Explanation: For the calculation of % ionic character, we use the formula

$\% \text{ ionic character}= [1-e^{\frac{-(X_A-X_B)^2)}{4}}]\times(100\%)$

where $X_A$ & $X_B$ are the Pauling's electronegativities.

The table attached has the values of electronegativities, by taking the values of Al and Mn from there,

$X_{Al}=1.61$

$X_{Mn}=1.55$

Putting the values in the electronegativity formula, we get

$\% \text{ ionic character}= [1-e^{\frac{-(1.61-1.55)^2)}{4}}]\times(100\%)$

= 0.20%

Now, there are 3 types of inter atomic bonding

1) Ionic Bonding: It refers to the chemical bond in which there is complete transfer of valence electrons between atoms

2) Covalent Bonding: It refers to the chemical bond involving the sharing of electron pairs between 2 atoms.

3) Metallic Bonding: It refers to the chemical bond in which there is an electrostatic force between the positively charged metal ions and delocalised electrons.

In $Al_6Mn$ compound, the % ionic character is minimal that is $\sim$ 0.20% and there are two metal ions present, therefore this compound will have metallic bonding.

8 0

3 years ago