What common carboxylic acid does vinegar contain?

How many elements had been discovered by 1860

UkoKoshka [18]

60 elements! I don't exactly know every element known, so if you are asking that, please tell us, but what I do know is that there were 60 elements in the periodic table by 1860.

5 0

3 years ago

Which equation obeys the law of conservation of mass? A. 2C4H10 + 2Cl2 + 12O2 7CO2 + CCl4 + 10H2O B. C4H10+ Cl2 + 2O2 7CO2 + CCl

Reptile [31]

Answer : The correct option is A.

Explanation :

Law of conservation of mass : In the chemical reaction, the mass of reactant must be equal to the mass of product.

A. $2C_4H_{10}+2Cl_2+12O_2\rightarrow 7CO_2+CCl_4+10H_2O$

The mass of reactant side = $2C_4H_{10}+2Cl_2+12O_2=[8(12)+20(1)]+4(35.5)+24(16)=642g$

The mass of product side = $7CO_2+CCl_4+10H_2O=7(12)+14(16)+12+4(35.5)+20(1)+10(16)=642g$

This means, the mass of product is equal to the mass of reactant. The mass remains conserved and obeys the law of conservation of mass.

The reaction B, C, D, E does not obey the law of conservation of mass.

Therefore, Only reaction A obey the law of conservation of mass.

7 0

4 years ago

Write the balanced equation and determine the information requested in each of the following.

Elena L [17]

Answer:

See explanation.

Explanation:

Hello!

In this case, we can proceed as follows:

1. Here, the undergoing chemical reaction is:

$C_2H_2+\frac{5}{2} O_2\rightarrow 2CO_2+H_2O$

Thus, the moles and mass of water turn out:

$n_{H_2O}=20.0kgC_2H_2*\frac{1000gC_2H_2}{1kgC_2H_2} *\frac{1molC_2H_2}{26.04gC_2H_2} *\frac{1molH_2O}{1molC_2H_2}=768molH_2O\\\\m_{H_2O}=768molH_2O*\frac{18.02gH_2O}{1molH_2O}=13,840 gH_2O$

2. Here, the undergoing chemical reaction is:

$CaCO_3+2HCl\rightarrow CaCl_2+H_2O+CO_2$

So the required moles of HCl and the yielded of water are:

$n_{CaCO_3}=2.6molHCl*\frac{1molCaCO_3}{2molHCl}=1.3molCaCO_3\\\\ n_{H_2O}=2.6molHCl*\frac{1molH_2O}{2molHCl}=1.3molH_2O$

3. Here, the undergoing chemical reaction is:

$Al_2O_3+3H_2SO_4\rightarrow Al_2(SO_4)_3+3H_2O$

Now, we apply each mole ratio obtain:

A.

$n_{H_2SO_4}=2.6molAl_2O_3*\frac{3molH_2SO_4}{1molAl_2O_3} =7.8molH_2SO_4$

B.

$n_{Al_2(SO_4)_3}=2.6molAl_2O_3*\frac{1molAl_2(SO_4)_3}{1molAl_2O_3} =2.6molAl_2(SO_4)_3$

Best regards!

4 0

3 years ago

What are the two variables that affect the electric force between two objects?

givi [52]

Explanation:

The electrical force between two objects is given by the formula as follows :

$F=\dfrac{kq_1q_2}{d^2}$

k is electrostatic constant

q₁ and q₂ are electric charges

d is distance between charges

So, the two force between two charged objects depends on the product of charges and distance between charges.

5 0

3 years ago

Which statement explains why a molecule of CH4 is nonpolar?

Deffense [45]

The answer is the option (3) The geometric shape of a CH4 molecule distributes the charges geometrically. the CH4 is a tetrahedral with the Carbon atom in the center and the four H atoms in the vertices of the tetrahedral. The C-H bond angles are all identical which makes the molecule perfectly symmetrical and so any dipolar moment will cancel making the molecule non polar.

8 0

3 years ago

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