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GREYUIT [131]
3 years ago
13

Identify the following as an example of a physical property or a chemical property. A bar of lead is more easily bent (malleable

) than a bar of aluminum of the same size.
Chemistry
2 answers:
Nastasia [14]3 years ago
7 0
This is a physical property, because chemical properties change the composition of the substances but in this case that doesn't happen. It only changes the shape of the lead.
weqwewe [10]3 years ago
5 0

Explanation:

Physical property is the property which can be measured.

For example, density, weight, mass, malleability, ductility etc are all physical properties.

Whereas a property that brings chemical changes in a substance is known as chemical property.

For example, reactivity, toxicity etc are all chemical properties.

Hence, when a bar of lead is more easily bent (malleable) than a bar of aluminum of the same size then it depicts physical property as no new bonds have been formed.

Thus, we can conclude that given example is an example of physical property.

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1) A light bulb takes in 30 of energy per second. It transfers 3j as use
natta225 [31]

Answer:

\boxed{\text{10 \%}}

Explanation:

The formula for efficiency is  

\begin{array}{rcl}\text{Efficiency} & = & \dfrac{\text{useful energy out}}{\text{energy in}} \times 100 \,\% \\\\\eta & = & \dfrac{w_{\text{out}}}{w_{\text{in}} } \times 100 \,\%\\\end{array}

Data:

Useful energy =  3 J

Energy input  = 30 J

Calculation:

\begin{array}{rcl}\eta & = & \dfrac{\text{3 J}}{\text{30 J}} \times 100 \,\%\\\\\eta & = & 10 \, \%\\\end{array}\\\text{ The efficiency is }\boxed{\textbf{10 \%}}

8 0
3 years ago
the Temperature of a sample of an ideal gas in a sealed 5.0 l container is raised from 27 oC to 77oC. If the initial pressure of
matrenka [14]
Answer:
              The pressure increases to 3.5 atm.

Solution:
                According to Gay-Lussac's Law, " At constant volume and mass the pressure of gas is directly proportional to the applied temperature".

For initial and final states of a gas the equation is,

                                           P₁ / T₁  =  P₂ / T₂
Solving for P₂,
                                           P₂  =  P₁ T₂ / T₁    ----- (1)

Data Given;
                   P₁  =  3 atm

                   T₁  =  27 °C + 273  =  300 K
 
                   T₂  =  77 °C + 273  =  350 K

Putting values in eq. 1,

                                           P₂  =  (3 atm × 350 K) ÷ 300 K

                                           P₂  =  3.5 atm
7 0
4 years ago
Christy is a forensic scientist. She is given
Nitella [24]

Answer:

The white powder is not sugar, so Christy's hypothesis is incorrect . Christy's next step should be to identify substances that have the measured molecular mass.

Explanation:

6 0
4 years ago
A solution that contains a large amount of salt and a small amount of water is said to be a _______ solution. A. diffused B. uns
Pachacha [2.7K]

Answer:

D. Concentrated

Explanation:

5 0
3 years ago
Read 2 more answers
A neutral atom of which of the four element has the smallest radius
arsen [322]
Answer:
Element 1

Explanation:
The ionization energy is defined as the energy required to remove electrons from the atoms.
We know that the nucleus of the atom attracts the electrons, thus, bound these electrons to the atom.
This means that as the radius decreases, the force of attraction between the nucleus and the electron will increase, therefore, the energy required to remove the electron would increase (and vice-versa).

Based on the above, the atom with the smallest radius would be the atom with the largest first ionization energy.

Hope this help :)
6 0
3 years ago
Read 2 more answers
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