All categories

4 years ago

Which of the following elements could replace iron in a compound? A) Ag, B) Ca, C) Cu, or D) Sn?

Chemistry

2 answers:

mestny [16]4 years ago

7 0

B: Ca can best replace iron in a compound! Vote me brainiest! <3

Eddi Din [679]4 years ago

6 0

She's right the answer is Ca

You might be interested in

How do fossil fuels play a role in the carbon cycle?(1 point) Fossil fuels require a lot of carbon to burn, which takes carbon o

satela [25.4K]

Answer: Fossil fuels are rich in carbon, and burning them releases carbon into the atmosphere.

Explanation:

The amount of carbon in the form of carbon dioxide in the atmosphere is about 0.03% by volume. This value is kept fairly constant by a natural process known as the CARBON CYCLE. This involves carbon dioxide being continually removed from the atmosphere by plants in photosynthesis, rain water as weak acids while in order to maintain this balance, carbon dioxide is at the same time returned to the atmosphere by:

--> burning of carbon containing substances (fossil fuel)

--> respiration of plants and animals and

--> Decomposition of organic substances.

Therefore the role of fossil fuels which are rich in carbon content releases carbon into the atmosphere when burnt.

7 0

3 years ago

A buffer with a pH of 4.31 contains 0.31 M of sodium benzoate and 0.24 M of benzoic acid. What is the concentration of [ H 3 O ]

Mnenie [13.5K]

Answer: The hydronium ion concentration in the solution is $1.29\times 10^{-4}M$

Explanation:

To calculate the molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Moles hydrochloric acid solution = 0.060 mol

Volume of solution = 1 L

Putting values in above equation, we get:

$\text{Molarity of HCl}=\frac{0.060}{1L}\\\\\text{Molarity of HCl}=0.060M$

The chemical reaction for aniline and HCl follows the equation:

$C_6H_5COO^-+HCl\rightarrow C_6H_5COOH+Cl^-$

Initial: 0.24 0.060 0.31

Final: 0.18 - 0.37

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

$pH=pK_a+\log(\frac{[\text{conjugate acid}]}{[\text{base}]})$

$pH=pK_a+\log(\frac{[C_6H_5COO^-]}{[C_6H_5COOH]})$

We are given:

$pK_a$ = negative logarithm of acid dissociation constant of benzoic acid = 4.2

$[C_6H_5COO^-]=0.18M$

$[C_6H_5COOH]=0.37M$

pH = ?

Putting values in equation 1, we get:

$pH=4.2+\log(\frac{0.18}{0.37})\\\\pH=3.89$

To calculate the hydronium ion concentration in the solution, we use the equation:

$pH=-\log[H_3O^+]$

pH = 3.89

Putting values in above equation, we get:

$3.89=-\log[H_3O^+]$

$[H_3O^+]=10^{-3.89}=1.29\times 10^{-4}M$

Hence, the hydronium ion concentration in the solution is $1.29\times 10^{-4}M$

3 0

3 years ago

What often occurs at a transform plate boundary (like the San Andreas Fault in California)? *

Zarrin [17]

It’s earthquakes

hope that helps

4 0

3 years ago

Which of the following is the correctly balanced chemical equation for the reaction of Ca(OH)2 and HNO3?

sleet_krkn [62]

Answer : The correct option is D.

Explanation :

Balanced chemical equation : It is defined as the mass or component of each atom should be equal on both sides of the equation.

The balanced chemical equation for the reaction of $Ca(OH)_2$ and $HNO_3$ is,

$Ca(OH)_2+2HNO_3\rightarrow 2H_2O+Ca(NO_3)_2$

So, the correct option is D.

8 0

3 years ago

Read 2 more answers

Name the following compounds: carbon (IV) fluorine

aalyn [17]

CF4 is the chemical equation of the compound

6 0

4 years ago