All categories

3 years ago

What is"An Elephant's Excellent trunk"mostly about?

Chemistry

2 answers:

inn [45]3 years ago

7 0

It's how long it is and how big

mr_godi [17]3 years ago

3 0

Mostly about what it can do with its trunk! also about how strong it is or evan how long! love to help!
contact me if you need more info
-luna

You might be interested in

Elements in the same column of the periodic table have what in common?

Kipish [7]

Answer:

Elements in same column of periodic table have same properties.

Explanation:

The elements in the same group have same number of valance electrons thus have similar properties.

Consider the elements of group two i.e alkaline earth metals. All have two valance electrons and show similar properties.

Magnesium, barium, calcium etc.

All alkaline earth metals form salt with halogens.e.g,

Mg + Cl₂ → MgCl₂

Ba + Br₂ → BaBr₂

Mg + Br₂ → MgBr₂

Ca + Br₂ → CaBr₂

They react with oxygen and form oxides of respective metal.

2Mg + O₂ → 2MgO

2Ba + O₂ → 2BaO

2Ca + O₂ → 2CaO

these oxides form hydroxide when react with water,

MgO + H₂O → Mg(OH)₂

BaO + H₂O → Ba(OH)₂

CaO + H₂O → Ca(OH)₂

With nitrogen it produced nitride,

3Mg + N₂ → Mg₃N₂

3Ba + N₂ → Ba₃N₂

3Ca + N₂ → Ca₃N₂

With acid like HCl,

Mg + 2HCl → MgCl₂ + H₂

Ba + 2HCl → BaCl₂ + H₂

Ca + 2HCl → CaCl₂ + H₂

8 0

4 years ago

Detergent has a ph of about 10. is detergent acidic or basic? use figure 8-3 to answer this question.

harina [27]

Answer is: detergent is basic.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity an aqueous solution.

When pH is less than seven (pH<7), solution is acidic.

When is equal seven (pH = 7), solution is neutral.

When pH is greater than seven (pH > 7), like in this example, solution is basic.

8 0

3 years ago

Read 2 more answers

Given the following information: Mass of proton = 1.00728 amu Mass of neutron = 1.00866 amu Mass of electron = 5.486 × 10^-4 amu

lesya692 [45]

<u>Answer:</u> The nuclear binding energy of the given element is $2.938\times 10^{12}J/mol$

<u>Explanation:</u>

For the given element $_3^6\textrm{Li}$

Number of protons = 3

Number of neutrons = (6 - 3) = 3

We are given:

$m_p=1.00728amu\\m_n=1.00866amu\\A=6.015126amu$

M = mass of nucleus = $(n_p\times m_p)+(n_n\times m_n)$

$M=[(3\times 1.00728)+(3\times 1.00866)]=6.04782amu$

Calculating mass defect of the nucleus:

$\Delta m=M-A\\\Delta m=[6.04782-6.015126)]=0.032694amu=0.032694g/mol$

Converting this quantity into kg/mol, we use the conversion factor:

1 kg = 1000 g

So, $0.032694g/mol=0.032694\times 10^{-3}kg/mol$

To calculate the nuclear binding energy, we use Einstein equation, which is:

$E=\Delta mc^2$

where,

E = Nuclear binding energy = ? J/mol

$\Delta m$ = Mass defect = $0.032694\times 10^{-3}kg/mol$

c = Speed of light = $2.9979\times 10^8m/s$

Putting values in above equation, we get:

$E=0.032694\times 10^{-3}kg/mol\times (2.9979\times 10^8m/s)^2\\\\E=2.938\times 10^{12}J/mol$

Hence, the nuclear binding energy of the given element is $2.938\times 10^{12}J/mol$

3 0

3 years ago

In which of the following physical states does a given substance have the highest entropy?

n200080 [17]

B) Gas
Reason: Because Gas has te hhighest entropy?

6 0

3 years ago

Read 2 more answers

A substance has a density of 3.84g/mL. What is the mass in (oz) of 136mL of the substance?

White raven [17]

Answer:

552.22

Explanation:

density=Mass/volume

therefore, Mass=density×volume

Mass=3.84*136

3 0

3 years ago