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ss7ja [257]
3 years ago
15

True or false?

Chemistry
1 answer:
Virty [35]3 years ago
3 0
The answer would be true
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Which is the balanced equation for V205 + Cas - CaO + V S.?
barxatty [35]

Answer:c

Explanation:

7 0
3 years ago
What is the molecular formula of a substance that decomposes into 1.33 g of h and 21.3 g of o, and was found to have a molar mas
Tema [17]
<span>H2O2 First, let's determine how many moles of hydrogen and oxygen atoms we have. Start by looking up the atomic weights of those elements: Atomic weight hydrogen = 1.00794 Atomic weight oxygen = 15.999 Moles hydrogen = 1.33 g / 1.00794 g/mol = 1.319522987 mol Moles oxygen = 21.3 g / 15.999 g/mol = 1.331333208 mol We now have a ratio of 1.319522987 : 1.331333208 and we want a ratio of small integers that is close. Start by dividing all the numbers in the ratio by the smallest value, giving: 1 : 1.008950371 This ratio is acceptably close to 1:1 so I assume the formula is of the form HnOn where n is a small integer. Let's initially assume that n is 1, so the mass would be 1.00794 + 15.999 = 17.00694 Obviously 17 is far smaller than 34.1. So let's divide 34.1 by 17.00694 and see what n should be: 34.1 / 17.00694 = 2.005063815 So the formula we want is H2O2, which is hydrogen peroxide.</span>
5 0
3 years ago
a mixture is made up of 3.35g of SiO2, 0.38g of cellulose and 8.76g of calcium carbonate. What is the percent of cellulose in th
Alchen [17]

Solution:

mass of the cellulose in the mixture is 0.38g

total mass of the mixture is:

3.35+0.38+8.76

=12.4g

thus the  percentage of the cellulose in the mixture is:

mass of the cellulose/total mass of the mixture*100%

0.38/12.4*100%

=3%

6 0
3 years ago
True or false one example of a chemical reaction is when H20 melts and changes state ice to liquid
iogann1982 [59]

Answer:

faulse

Explanation:

this is an example of a change in proporties

6 0
2 years ago
What energy change occurs during condensation? Please answer, i’ll give you brainliest !
kupik [55]

Answer:

Please see Explanation and Attachment (Heating Curve for Water)

Explanation:

Energy change associated with phase change in substances is either endothermic (energy added to system) or exothermic (energy removed from system). Condensation is but one term in six (6) describing phase change occurring when energy change is involved. The following table, in general, summarizes the related effects of energy change as applied to phase change.

Process                   Phase Change         Energy Change*

Condensation         gas => liquid             Exothermic

Evaporation             liquid => gas            Endothermic

Freezing                  liquid => solid           Exothermic

Melting                    solid => liquid            Endothermic

Sublimation            solid => gas                Endothermic

Deposition              gas => solid               Exothermic

_____________________

* Energy Change terms:

Endothermic => Addition of heat energy

Exothermic => Removal of heat energy

7 0
3 years ago
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