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2 years ago

Which of these are true for a hypothesis? (You can pick more than one)

1 answer:

6 0

Hypotheisis is just like an initial building block for a building. The true statements about hypothesis among the given are-

First guess- hypothesis is a proposed explanation for something which is observed. Thus the explanation is just a guess and not a proved one.
An initial idea which is assumed to be true - The whole experiment or research is based on an assumption which is supposed to be true and the scientist works to prove that true.

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If an atom has sp3d2 hybridization in a molecule:

never [62]

Answer:

a. the maximum number of σ bonds that the atom can form is 4

b. the maximum number of p-p bonds that the atom can form is 2

Explanation:

Hybridization is the mixing of at least two nonequivalent orbitals, in this case, we have the mixing of one s, 3 p and 2 d orbitals. In hybridization the number of hybrid orbitals generated is equal to the number of pure atomic orbital, so we have 6 hybrid orbital.

The shape of this hybrid orbital is octahedral (look the attached image) , it has 4 orbital located in the plane and 2 orbital perpendicular to it.

This shape allows the formation of maximum 4 σ bond, because σ bonds are formed by orbitals overlapping end to end.

And maximum 2 p-p bonds, because p-p bonds are formed by sideways overlapping orbitals. The atom can form one with each one of the orbitals located perpendicular to the plane.

4 0

3 years ago

Read 2 more answers

A small hole in the wing of a space shuttle requires a 15.9 cm2 patch.

Rzqust [24]

The patch area in square kilometers is 1.59*10⁻⁹ km₂

Why?

This is an unit conversion problem. We have to convert from cm² to km². We can do that by knowing that there are 100 cm in 1 m, and 1000 m in 1 km, so 100000 cm=1km. Knowing that we can apply the following conversion factor:

$15.9 cm^{2} * (\frac{1 km}{100000 cm} )^{2}=0.00000000159 km^{2}$

Now to convert this value to scientific notation, we have to move the decimal point to the right until we get a whole number, and the exponent of the number 10 is going to be the number of spaces we moved to the right (negative), so the final answer is:

$0.00000000159 km^{2}=1.59*10^{-9} km^{2}$

Have a nice day!

#LearnwithBrainly

8 0

3 years ago

Which is an example of gene modification that humans have done for thousands of years?

miv72 [106K]

Cross breeding plants to make better apples

4 0

3 years ago

How many grams does f Cacl2 should be dissolved in 750.0 mL of water to make a 0.100 M solution Cacl2

AVprozaik [17]

Answer:

8.324 g

Explanation:

First we convert 750.0 mL into L:

750.0 mL / 1000 = 0.750 L

Then we calculate the required number of moles of CaCl₂, using the definition of molarity:

Molarity = moles / liters

Molarity * liters = moles

0.100 M * 0.750 L = 0.075 mol

Finally we convert 0.075 moles of CaCl₂ into grams, using its molar mass:

0.075 mol * 110.98 g/mol = 8.324 g

6 0

2 years ago

A solution has a concentration of 0.8 M and contains 15 g AgBrO3. What is the volume of the solution

topjm [15]

Answer:

Solution Concentration: Molarity Moles of solute in one liter of solution Used because it describes how many molecules of solute are in each liter of solution Tro: Chemistry: A Molecular Approach, 2/e 6 amount of solute (in moles) Molarity, M = amount of solution (in L) moles of solute M = L of solution or simply 4

GOOD LUCK!!

3 0

2 years ago