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slavikrds [6]
3 years ago
7

If matter is uniform throughout and cannot be separated into other substances by physical means, it is __________.

Chemistry
2 answers:
lesya [120]3 years ago
6 0
B. either an element or a compound
yulyashka [42]3 years ago
4 0

Answer: Option (a) is the correct answer.

Explanation:

When an element chemically combines with another element in a fixed ratio by mass then it results into the formation of a compound.

A compound can be separated into its constituent particles only by chemical means and not by any physical means.

An element is a substance which contains only one type or kind of atoms.

For example, a piece of sodium will contain only atoms of sodium.

An element cannot be divided into its constituent particles by any means.

Whereas particles of a mixture never combine chemically with each other. So, they can be separated by physical means.

Thus, we can conclude that if matter is uniform throughout and cannot be separated into other substances by physical means, it is a compound.

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Two children on a seesaw are able to balance perfectly while on Earth.would they still be balanced if you saw was brought to the
Setler [38]

Answer:

C

Explanation:

Because on the moon you are basically weightless and your mass would stay the same

3 0
3 years ago
If 4520 kj of heat is needed to boil a sample of water, what is the mass of water
Cerrena [4.2K]

Answer:

1,085g of water

Explanation:

If we have the value 4520kj is because the question is related to Energy and heat capacity. In this case, the law and equation that we use is the following:

                                                  Q= m*C*Δt  where;

Q in the heat, in this case: 4520kj

m is the mas

Δt= is the difference between final-initial temperature (change of temperature), in this exercise we don´t have temperatura change.

In order to determine the mass, I will have the same equation but finding m

                                          m= Q/C*Δt    without   m=Q/C

So: m= 4,520J/4.18J/g°C

      m= 1,0813 g

5 0
3 years ago
1. The most useful ore of aluminum is bauxite, in which Al is present as hydrated oxides, Al2O3⋅xH2O The number of kilowatt-hour
lianna [129]

*Answer:

Option A: 59.6

Explanation:

Step 1: Data given

Mass of aluminium = 4.00 kg

The applied emf = 5.00 V

watts = volts * amperes

Step 2: Calculate amperes

equivalent mass of aluminum = 27 / 3 = 9  

mass of deposit = (equivalent mass x amperes x seconds) / 96500

4000 grams = (9* amperes * seconds) / 96500

amperes * seconds = 42888888.9

1 hour = 3600 seconds

amperes * hours = 42888888.9 / 3600 = 11913.6

amperes = 11913.6 / hours

Step 3: Calculate kilowatts

watts = 5 * 11913.6 / hours

watts = 59568 (per hour)

kilowatts = 59.6 (per hour)

The number of kilowatt-hours of electricity required to produce 4.00kg of aluminum from electrolysis of compounds from bauxite is 59.6 kWh when the applied emf is 5.00V

5 0
3 years ago
What is thermal energy?
timurjin [86]
Thermal energy is THE MEASURE OF TEMPERATURE IN A SYSTEM.
Thermal energy refers to the internal energy that is present in a system as a result of its temperature. The motion of the particles of an object depends on the temperature of the object and the higher the temperature, the faster the movement of the particles. The reverse is also true. 
7 0
3 years ago
Read 2 more answers
Nvm i got the answer
balandron [24]
Good luck with your assignment :)
4 0
2 years ago
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