I will mark brainliest

Answer: hydrogen bonding

Explanation:

When hydrogen atoms bond with oxygen atoms, there is hydrogen bonding.

Explanation:

gold is found very low down in the reactivity series thus is relatively unreactive. Metals found above gold in the series are more reactive compared to gold and thus is able to undergo a single displacement reaction, replacing gold in solution, which is then precipitated as a solid.

Answer: The concentration for pH is 4 but, for pOH it is 10.

A brainliest please?

The answer is the half life of phosphorus-32 is of 14 days .

The half-life of a radioactive isotope is the amount of time it takes for one-half of the radioactive isotope to decay.

The half-life of a specific radioactive isotope is constant; it is unaffected by conditions and is independent of the initial amount of that isotope.

Mass of atoms initially,

N₀ =2.0 g

Mass after 42 days,

N =0.25 g

mass left undecayed we have,

[tex]\rm\dfrac{N}{N_{0}} = \dfrac{1}{2^{n}}[/tex]

where  n  is number of half lives occured (the number of times it disintegrated into half of original)

[tex]\rm\dfrac{0.25}{2} = \dfrac{1}{2^{n}}[/tex]

[tex]\rm\dfrac{1}{8} = \dfrac{1}{2^{n}}[/tex]

[tex]\rm\dfrac{1}{2^{3}} = \dfrac{1}{2^{n}}[/tex]

n= 3

number of half lives occured in 42 days is 3

if half life is  [tex]\rm t_{\frac{1}{2} }[/tex]

then

3* (  [tex]\rm t_{\frac{1}{2} }[/tex]  )  = 42

[tex]\rm t_{\frac{1}{2} }[/tex] = 14 days

Therfore the half life of phosphorus-32 is of 14 days .

To know more about Half life

https://brainly.com/question/24710827

#SPJ1

Answer:

2%

Explanation:

.2 g  / 10 g    * 100% = 2%

1.6 x 10⁸ : 8 x 10¹¹

1.6 : 8 = 0.2

10⁸ : 10¹¹ = 10⁻³

= 0.2 x 10⁻³ = 2 x 10⁻⁴

Answer:

The electrons farthest from the nucleus of the atom.

hope this helps!

The required pH of the solution is 4.2 which means solution is acidic in nature.

pH of the solution is define as the negative logarithm of the concentration of the hydronium ion, and it is represented as:

pH = -log[H⁺]

Given concentration of H₃O⁺ ion = 6.25×10⁻⁵ M

On putting this value on above equation, we get

pH = -log(6.25×10⁻⁵) = 4.2

Hence required pH of the solution is 4.2.

To know more about pH, visit the below link:
https://brainly.com/question/10313314

#SPJ1

Answer:

0.5

Explanation:         (3) Factors affecting transport number (i) Temperature: A rise in temperature tends to bring the transport number of cation and anion more closely to 0.5

[tex]27 ~\text{cal} = \dfrac{27}{1000} ~ \text{kcal} = 0.027~ \text{kcal.}[/tex]

Answer: Civilization is the stage of human social and cultural development and organization that is considered most advanced.

Explanation:

BEST ANSWER :

a civilisation is a complex human society, usually made up of different cities, with certain characteristics of culture and technological development

Based on the mole ratio of the reaction, the alkalinity of the exhibit is 0.02 mg/L of CaCO3.

Alkalinity is a measure of the hydroxide ion concentration of a solution.

From the equation of the reaction, the mole ratio is 1 :1.

1 mole of the sample reacts with 1 mole of acid.

Moles of titrant = 1.58 mL × 0.019 M = 0.003 mmoles

Moles of samples = 0.003 mmoles

The concentration of sample = 0.003 mmol/15 mL = 0.0002 M

mass concentration = 0.0002 M × 100.0869 g/mol

mass concentration = 0.02 g/mL

Converting to mg/L:

0.02 g/mL × 1000 mg/1000 L = 0.02 mg/L

Therefore, the alkalinity of the exhibit is 0.02 mg/L of CaCO3.

Learn more about alkalinity at: https://brainly.com/question/25312410

#SPJ1

Answer:

About 300 million years ago, 

Explanation:

Col. Edwin Drake

Answer:

Oil was formed from the animals and plants that lived millions of years ago and the creator is John D Rockefeller and others in 1870

Answer: An acid-base reaction is the transfer of a proton from a proton donor ... The reaction between a Brønsted-Lowry acid and water is called acid ionization.

Explanation:

Answer:

B

Explanation:

From charles' law,

[tex]v \alpha t[/tex]

where v is volume and t is absolute temperature

The new molar concentration (M) of the diluted solution when added 2.5L of water to 0.5 L of 8.50 M solution is 1.42M.

Molar concentration of the solution will be calculated by using the below equation:
M₁V₁ = M₂V₂, where

M₁ = initial concentration of solution = 8.50 M

V₁ = initial volume = 0.5 L

M₂ = final concentration of diluted solution = ?

V₂ = final volume of diluted solution = 0.5 + 2.5 = 3 L

On putting values, we get

M₂ = (8.50)(0.5) / (3) = 1.416 = 1.42 M

Hence required molar concentration of dilute solution is 1.42M.

To know more about molarity, visit the below link:

https://brainly.com/question/24305514

#SPJ1

I'm curious on what it is but I wish I could help

Answer:

c could someone try to do the page for me please i will really appreciate it I'll mark brainliest i need it by the end of my geometry class

Answer: The correct answer is (a)combination.

Explanation: Direct combination and synthesis are the same process in which two reactants form to make a product

The concentration of KBr in the resultion solution is 0.34 M

From the question, we are to determine the concentration of KBr in the resulting solution

First, we will determine the number of mole of KBr present

Using the formula,

[tex]Number\ of\ moles = \frac{Mass}{molar\ mass}[/tex]

Mass of KBr = 20.1 g

Molar mass of KBr = 119.00 g/mol

∴ Number of moles of KBr present = [tex]\frac{20.1}{119.00}[/tex]
Number of moles of KBr present = 0.1689 mole

Now, for the concentration of the KBr

Using the formula,

[tex]Concentration = \frac{Number\ of\ moles}{Volume}[/tex]

Volume of solution = 500.0 mL = 0.50 L

∴ Concentration of KBr = [tex]\frac{0.1689}{0.50}[/tex]

Concentration of KBr = 0.3378 M

Concentration of KBr ≅ 0.34 M

Hence, the concentration of KBr in the resultion solution is 0.34 M

Learn more on Stoichiometry here: https://brainly.com/question/17619783

#SPJ1

short fur

Explanation:

According to Mendel's Law of Dominance, if short fur is the dominant trait, and long fur is recessive; a heterozygous genotype will definitely be phenotypically short fur.

[tex]\huge\mathfrak\colorbox{white}{}[/tex]

Because you'll definitely get it right.

Answer:

1. C. [tex]10.5 *10^{23[/tex] molecules

2. C. [tex]9.04*10^{21}[/tex] molecules

3. D. [tex]89.64*10^{-24[/tex] g

Explanation:

1. To find the molecules of manganese from moles use this equation:

[tex]moles (x)*\frac{6.022 *10^{23} molecules }{1 mole}[/tex]

Insert the amount of moles given (1.75) into the equation and solve:

[tex]1.75moles*\frac{6.022 *10^{23} molecules }{1 mole}[/tex] = [tex]1.05 *10^{24[/tex] molecules.

In the question they have the answer as [tex]10.5 *10^{23[/tex] which is the same as [tex]1.05 *10^{24[/tex]. So, [tex]10.5 *10^{23[/tex] is the answer.

2. To find molecules from grams per mole, use this equation:

[tex]x grams *\frac{1 mol}{mass(g)} *\frac{6.022*10^{23} molecules}{1 mol}[/tex]

The molar mass of AlCl3 is 133.34 g/mol, and we want to know how many molecules in 2 grams. Plug these into the equation.

[tex]2 g *\frac{1 mol}{133.34g} *\frac{6.022*10^{23} molecules}{1 mol}[/tex] = [tex]9.04*10^{21}[/tex] molecules

The answer will be C. [tex]9.04*10^{21}[/tex] molecules.

3. To find the mass of the hydrogen atoms, use this equation:

[tex]x u*\frac{1.66*10^{-24}g}{1u}[/tex]

We are given 54 u. Plug this into the equation and solve:

[tex]54 u*\frac{1.66*10^{-24}g}{1u} = 8.964*10^{-23[/tex] grams

Once again, the question gives us this answer in a different form of [tex]89.64*10^{-24[/tex] g, but they are the same. So, the final answer is D. [tex]89.64*10^{-24[/tex] g.

I hope this helps! If you have any questions about my work feel free to leave them in the comments!

C. both

CHO - propanal = aldehyde

A. Skeleton Structure

B. Molecular structure

The second structure corresponds to the 2,2-dimethylpropanal molecule as it is C₅H₁₀O. Thus, option B is correct.

A molecular structure is a representation of the atoms and the molecules of the compound along with their numbers. It is different from the skeletal structure as it does not shows an overview of the chains and branches.

2,2-dimethylpropanal is an aldehyde-containing molecule that contains 5 carbon, 10 hydrogens, and one oxygen atom in its formula and is best represented in figure B.

Therefore, figure B shows 2,2-dimethylpropanal.

Learn more about molecular structure here:

https://brainly.com/question/27726860

#SPJ2

Answer:

0.9375

Explanation:

3.0x30x15 = 17 496 000 kg [tex]sx^{2}[/tex]

subtract or divde

then you take the 9 and 375 add 0.9000 and combine them and there you go.

                                                          [tex]+\frac{0.9000}{375} =0.9375[/tex]

Answer:

Calcium hydroxide is a white precipitate, too, and it won't dissolve if more sodium hydroxide is added to the solution. No significant precipitate will be formed between calcium ions and ammonia.

Answer:

This will be really short but pi2 is the condense amount that (425h209) will equal 4.98288493

Explanation:

The student, begins emphasis, most, ends emphasis, likely trying to answer How does temperature affect the physical state of water.

A usually reversible change in the physical properties of a substance, like size or shape: Freezing a liquid is a physical change.

The temperature has a direct effect on whether a substance exists as a solid, liquid or gas. Generally, increasing the temperature turns solids into liquids and liquids into gases; reducing it turns gases into liquids and liquids into solids.

Hence, option D is correct.

Learn more about physical change here:

https://brainly.com/question/3680148

#SPJ1

Answer:

[tex]c = 0.441mol{dm}^{ - 1} [/tex]

Explanation:

[tex]m = 25.22g \\ v = 2.2l = 2.2 {cm}^{3} \\ mm(lif ) = 7 + 19 \\ = 26g {mol}^{ - 1} \\ number \: of \: moles(n) = \frac{m}{mm} \\ = \frac{25.22g}{26g {mol}^{ - 1} } \\ = 0.97mol \\ concetration(c) = \frac{n}{v} \\ = \frac{0.97mol}{2.2 {cm}^{3} } \\ c = 0.441mol {dm}^{ - 3} [/tex]

The inferences which we made about stars after two week are stars disappear and star move fast.

A star is a heavenly body made up of a brilliant spheroid of plasma held together by gravity.

Hence, the inferences which we made is stars disappear and star move fast.

To know more about stars, visit the below link:

https://brainly.com/question/13175046

#SPJ1