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kvv77 [185]
2 years ago
12

Which of the following is a true statement?

Chemistry
1 answer:
BlackZzzverrR [31]2 years ago
6 0

Answer:

its either all animals or only mammals. the thing with all animals is that they do have life cycles but not the same as like say humans or elephants, some are complicated.

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Which of the following best describes atoms? *
Masja [62]

a. Smallest basic units of matter

\boxed{ \boxed{ \bf{ \bigstar \: Extra}}}

<u>Atom</u>: An atom is the smallest particles of a substance which may or may not exist in free state but takes part in chemical reactions.

<u>Molecule</u>: A molecule is a substance which exists in free state but doesn't take part in chemical reactions.

<u>Laws</u><u> </u><u>of</u><u> </u><u>chemical</u><u> </u><u>combination</u><u>:</u><u>-</u>

  • Law of conservation of mass

  • Law of constant proportions

  • Law of multiple proportions

  • Law of combining volumes

  • Law of reciprocal proportions
6 0
3 years ago
According to Dalton, if 2 grams of element X combine with 4 grams of element Y to form compound XY, how many grams of element X
adell [148]
The ratio of reactant in grams would be influenced by the reaction equation and the molar mass of the elements. But the ratio of a reactant needed in grams would be same for a reaction.
If 2 grams of element X combine with 4 grams of element Y to form compound XY, it means the ratio of reactant in grams<span> would be 2:4 or 1:2

The number of element X needed for 28grams of element Y would be:
1/2 * 28grams = 14 grams.</span>
8 0
3 years ago
Solve for ‘x’: 12(x-7)+3(2x+2)=50x-2
Alex Ar [27]

Answer:

Explanation:

Hi there!

12(x-7) = 12x -84

3(2x+2) = 6x+6

Total 18x-78

18x-78 = 50x-2

-78= 32x-2

-76= 32x

19/8 =x

Hope you understand

Have a nice day,

Wolfiex.

5 0
4 years ago
How many molecules are in 5 moles of C10H210?
Pavlova-9 [17]

Answer:

3.0 x 10²⁴molecules

Explanation:

Given parameters:

Number of moles of compound  = 5moles

Unknown:

Number of molecules  = ?

Solution:

A mole is substance that contains the Avogadro's number of particles;

   1 mole  = 6.02 x 10²³ molecules

   5 moles of the compound will give 5 x 6.02 x 10²³ molecules

                = 3.0 x 10²⁴molecules

3 0
3 years ago
if the percent by volume is 2% and the volume of solution is 250 mL what is the volume of solute and solution
Liula [17]

Answer:

Solute = 5 mL; solution = 250 mL  

Explanation:

The formula for percent by volume is

\text{Percent by volume} = \dfrac{\text{Volume of solute}}{\text{Volume of solution}}\times 100 \, \%

If you have 250 mL of a solution that is 2 % v/v,

\begin{array}{rcl}2 \, \% & = & \dfrac{\text{Volume of solute}}{\text{250 mL}}\times 100 \, \%\\\\2 \times \text{ 250 mL} & = & \text{Volume of solute} \times 100\\\text{Volume of solute} & = & \dfrac{2 \times 250\text{ mL}}{100}\\\\ & = & \textbf{5 mL}\\\end{array}

If there is no change of volume on mixing,

Volume of solution = 250 mL

 -Volume of solute = <u>     </u><u>5</u><u>      </u>

 Volume of solvent = 245 mL

5 0
3 years ago
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