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AleksandrR [38]
3 years ago
10

Which of these is an example of physical change?

Chemistry
2 answers:
bearhunter [10]3 years ago
7 0
Water evaporating is a physical change,
While it changes form from liquid to gas, the chemical composition is still the same and no chemical reaction occurs.
enot [183]3 years ago
7 0
Water evapoating number 1 is the answer
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What is the difference between a conductor and an insulator?
USPshnik [31]

Answer:materials that impede the free flow of electrons from atom to atom and molecule to molecule.

6 0
2 years ago
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Determine the mass of CaCO3 required to produce 40.0 mL CO2 at STP. Hint use molar volume of an ideal gas (22.4 L)
cupoosta [38]

Answer:

m_{CaCO_3}=0.179gCaCO_3

Explanation:

Hello,

In this case, since the undergoing chemical reaction is:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

The corresponding moles of carbon dioxide occupying 40.0 mL (0.0400 L) are computed by using the ideal gas equation at 273.15 K and 1.00 atm (STP) as follows:

PV=nRT\\\\n=\frac{PV}{RT}=\frac{1.00 atm*0.0400L}{0.082\frac{atm*L}{mol*K}*273.15 K})=1.79x10^{-3} mol CO_2

Then, since the mole ratio between carbon dioxide and calcium carbonate is 1:1 and the molar mass of the reactant is 100 g/mol, the mass that yields such volume turns out:

m_{CaCO_3}=1.79x10^{-3}molCO_2*\frac{1molCaCO_3}{1molCO_2} *\frac{100g CaCO_3}{1molCaCO_3}\\ \\m_{CaCO_3}=0.179gCaCO_3

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3 0
4 years ago
Which statement describes the most likely result of a field being cleared to build homes?
Anna35 [415]

Answer:

Biodiversity will decrease.

Explanation:

The likely result of clearing the fields for building homes is that biodiversity will decrease.

Biodiversity is the variation in life forms within a particular area.

  • The balance of the ecosystem is easily tripped by the influence of human activities.
  • Some habitats are easily destroyed when new fields are cleared.
  • Habitat loss is huge problem, in the ecosystem as a result of human activities.
6 0
3 years ago
Help me ASAP !!!!!!!!!!
lapo4ka [179]

Answer:

metallic

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3 0
3 years ago
Which pair of compounds are both products of photosynthesis?
Lelechka [254]

Answer: Glucose and oxygen

Explanation:

The basic products of photosynthesis are glucose and oxygen. Photosynthesis is a process in which green plants produce there own food from carbon dioxide (CO2) and water (H2O) and in the presence of energy from the sun to produce glucose(food) and oxygen

After series of reaction, the overall equation for photosynthesis is

6CO2 + 6H20 + (sunlight ) → C6H12O6 + 6O2

Carbon dioxide + water + energy from sunlight to produces glucose and oxygen.

Answer is glucose and oxygen

4 0
3 years ago
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