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luda_lava [24]
3 years ago
15

Please help me! Physical change involves a change in composition. True or False

Chemistry
1 answer:
Brums [2.3K]3 years ago
3 0

Answer:

FALSE!!

Explanation:

Physical changes occur when objects or substances undergo a change that does NOT change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combines or break up to form new substances.

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At 40 mph, how long does it take to travel 64 miles
gogolik [260]
1.5 hours
explanation: don’t have one just trust me
6 0
2 years ago
In carbon dioxide (CO2), how many grams of oxygen (O) would there be if there are 24 grams of carbon (C)?
Zarrin [17]

Answer:

64g of Oxygen

Explanation:

Firstly, carbon and oxygen react to form CO2 as follows;

C + O2 => CO2

According to the equation, one mole of C reacts with one mole of O2 to give one mole of CO2

Since molar mass of C= 12g/mol, O= 16g/mol

One mole of (C) contains 12g

One mole of O2 contains 16(2) = 32g

Hence, If there are 24g of C, there would be 24 × 32 / 12

= 768/12

= 64g

Hence, there would be 64g of oxygen if there are 24g of Carbon

6 0
3 years ago
What is the process of shedding feathers and growing new ones back
laiz [17]
Molting

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3 0
3 years ago
If an athlete runs at a speed of 12.9 km/hour, how long will it take the athlete to run a marathon (about 42.2 km)? Express your
jekas [21]

Answer:

Time = 3.27s

Explanation:

Time = Distance / Speed

Time = 42.2 / 12.9 = 3.2713

When you multiply the number of significant figures in the result is the same as the number with the least significant figures.

In this case 42.2 has 3 significant figures and 12.9 also has 3 significant figures, therefore the answer must have 3 significant figures too.

Time = 3.27 s

7 0
3 years ago
What is internal energy is
jeka57 [31]

Answer:

According to Brittanica, "Internal energy [is] the property or state function that defines the energy of a substance in the absence of effects due to capillarity and external electric, magnetic, and other fields."

5 0
3 years ago
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