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Amiraneli [1.4K]
4 years ago
5

Any substance composed of two or more elements that are chemically combined in a fixed proportion is

Chemistry
1 answer:
eimsori [14]4 years ago
6 0
(4) a compound is the correct answer~
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What is the MOST accurate conclusion can you draw about the vaporization of the substance?
kupik [55]
<span> It requires much more energy to vaporize the substance than to melt it</span>
8 0
4 years ago
How many grams are in .98 mols of C6H12O6 (*round to the nearest hundredth and include the unit "g C6H12O6" after your number)
Mnenie [13.5K]
Find 1 mol
6C = 12*6 = 72
12H=1*12 = 12
O6 = 16*6 = 96
Total = 180 grams

0.98 mol
0.98 * 180 = 176.40 My answer would have to go out to 176.40

Note: anyone responding will use rounded numbers for the atomic mass. All periodic tables have variations in them. Use your periodic table to get the better atomic mass.

Answer
176.40 g C6H12O6 <<<<
8 0
4 years ago
Are the activities exothermic or endothermic?​
Alexandra [31]

Answer:

The first 5 are exothermic reaction because heat is in product means heat is evolved or given out.

And last no reaction shows that heat is required so last reaction is endothermic reaction.

Explanation:

And heat is evolved in exothermic reaction and heat is absorbed in endo thermic reaction

6 0
3 years ago
Fraternal twins are formed when two different sperm fertilize two different eggs. How do you think physical characteristics, suc
Dimas [21]

Identical twins will have the e physical features such as hair color and eye color, because they were formed from the exact same egg and sperm. Fraternal twins are formed from two different eggs and sperm, so those twins will look different from each other.

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3 0
3 years ago
Read 2 more answers
50cm3 of a mixture of methane and hydrogen were mixed with excess oxygen and exploded, the product after cooling to the original
marin [14]

Answer:the initial composition of the reactants is

40cm^3 of CH4

40cm^3of H2

100cm^3 of H2O

Explanation:

Balanced reaction is

CH4 +H2+5/2O2______

CO2 +3H2O

Excess KOH at room temperature absorbs CO2 whose volume is given by 40cm^3 i.e the volume by which the solution decreases

So using Gay lussac combining ratio which states that gases combine in volumes that are in simple ratio to each other if gases.

Since CO2 in the equation is 1 mole

Means 1mole represent 40cm^3

So CH4:H2:O2 are in ratio of 1:1:5/2=(40:40:100)cm^3 respectively.

8 0
3 years ago
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