2 years ago

Which statement best describes a physical change?

2 answers:

8 0

Answer: 3 Changes can occur to physical properties of a substance, but the chemical composition of the substance remains the same

Explanation:

Physical change mainly physical properties of a substance while the chemical changes remain unchanged. Once there is a change to the chemistry of the substance, this would be classified as a chemical change.

Nina [5.8K]2 years ago

3 0

The answer is 2 because the composition won’t change just the physical aspects

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0.750mol of gas are stored in a tank at a pressure of 275kpa and a temperature of 0.00 degrees * C What is the volume of the tan

nordsb [41]

Answer:

The volume on the tank is 6, 20 L

Explanation:

We use the formula PV=nRT. We convert the units of pressure in kPa into atm and temperature in Celsius into Kelvin:

0°C=273K

101,325kPa---1 atm

275kPa --------x=(275kPax 1 atm)/101,325kPa= 2,71 atm

PV=nRT --> V=nRT/P

V= 0,750 mol x 0,082 l atm /K mol x 273 K/ 2, 71 atm= <em>6, 20 L</em>

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2 years ago

Which element(s) is being reduced in the redox reaction below? 6 nh4clo4 (s) + 10 al(s) 5 al2o3 (g) + 6 hcl (g) + 3 n2 (g) + 9 h

vitfil [10]

The answer is Cl because its oxidation number goes from a +7 down to a -1.

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3 years ago

What are the charged particles that form when atoms gain or lose electrons? *

Sunny_sXe [5.5K]

Answer:

ions

not sure but I think that's what it is

4 0

2 years ago

Neutral atoms of the same element can differ in their number of

konstantin123 [22]

Answer:

a. neutron

Explanation:

A neutral atom has the same number of protons and electrons because in order for it to be a neutral atom the charges must be the same.

a neutron has no charge therefore it can be different then the number of protons and electrons in a neutral atom as it won't affect the charge.

7 0

1 year ago

What is the mass number of a uranium isotope that has 92 protons and 143 neutrons?

myrzilka [38]

Mass number = proton number+ neutron number
m=92+143
=235

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2 years ago