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sergiy2304 [10]
3 years ago
6

Several properties of water are shown. Classify each property as a PHYSICAL property or a CHEMICAL property.

Chemistry
2 answers:
BaLLatris [955]3 years ago
7 0

Explanation:

A property which brings no change in chemical composition of a substance is known as a physical property.

For example, size, mass, density etc are physical property.

Whereas a property which brings change in chemical composition of a substance is known as a chemical property.

For example, reactivity, toxicity are chemical properties.

Therefore, classify the given properties as follows.

  • Can be split into hydrogen and oxygen - chemical property.
  • Is liquid at room temperature - physical property.
  • Has density of 1.0 g/cm^3 - physical property.
  • Reacts with certain metals - chemical property.

Verizon [17]3 years ago
4 0

Splitting is chemical liquid at room temp is physical density is physical and reactions are chemical

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The reaction between potassium metal and water produces potassium hydroxide and hydrogen gas.
Phantasy [73]

Answer:

2K   +   2H₂O   →   2KOH  + H₂

Explanation:

The reactants are:

    Potassium metal  = K

    Water  = H₂O

 The products are:

  Potassium hydroxide  = KOH

  Hydrogen gas  = H₂  

The reaction equation is given as;  

                Reactants   →   Products

        2K   +   2H₂O   →   2KOH  + H₂

The reaction is a single displacement reaction

7 0
3 years ago
Which of the following is the best example of a scientific law
cestrela7 [59]
A scientific law is a statement based on repeated experimental observations that describes some aspects of the universe. A scientific law always applies under the same conditions, and implies that there is a causal relationship involving its elements.
7 0
3 years ago
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5. For which of the following reactions would the heat of reaction be labelled ∆Hf°? a) PCl3 + ½ O2(g) ->POCl3(g) b) CaO(s) +
user100 [1]

Answer:

C

Explanation:

∆H°f means the enthalpy change of formation of one mole of substance by its constituent elements under standard conditions.

So in an equation for ∆H°f, we must see 2 or more elements as reactants combining to form a compound.

In the 4 answers, only C represents elements forming a substance (Al(s) + 3/2O2(g) + 3/2H2(g) -> Al(OH)3(s)),

while the others include compounds as one of their reactants.

8 0
3 years ago
What is the mass of 0.44 moles C6H6?
Crank

Answer:

1 mole is equal to 1 moles C6H6, or 78.11184 grams.

Hopefully this helped!

-✩sandwichchan✩

6 0
3 years ago
What's the velocity of a ball falling with 100 joules of kinetic energy and a mass of 2 kilograms?
FinnZ [79.3K]

Answer:

E

Explanation:

kinetic energy of linear motion

k.e =  \frac{1}{2} m {v}^{2}

kinetic energy, K.e= 100joules

mass, m = 2kg

velocity, v =?

substituting the values into the formula :

100joules =  \frac{1}{2}  \times 2kg \times  {v}^{2}

{v }^{2}  = 100

v =  \sqrt{100 }

v = 10m { \sec }^{ - 1}

3 0
3 years ago
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