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3 years ago

Where are elements with similar chemical properties found on the periodic table?

1 answer:

8 0

All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

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Calculate the average obtained from the following weighings of the same object. Do not forget to include formulas, units, and th

bazaltina [42]

Answer:

10.4376 g

Explanation:

First we <u>calculate the sum of the weighings</u>:

10.4375 g + 10.4381 g + 10.4373 g + 10.4376 g = 41.7505 g

Then we <u>divide the sum by the number of weighings to calculate the average:</u>

Number of weighings = 4

Average = Sum of weighings / Number of weighings

41.7505 g / 4 = 10.4376 g

6 0

2 years ago

Which two body systems are most important in breaking down food and distributing nutrients throughout the body?

andrey2020 [161]

Answer:

hope you like and pls follow me

Explanation:

digestive and circulatory system are most important in breaking down food and distributing nutrients throughout the body.

7 0

2 years ago

What is the value of the activation energy of the uncatalyzed reaction?

Lubov Fominskaja [6]

The value of the activation energy of an uncatalyzed reaction is greater than that of a catalyzed reaction. As we know, a catalyst provides an alternative path for the reaction to happen at a faster rate. So, for a catalyzed reactio, activation energy is lesser than the original path.

6 0

3 years ago

What does the mass of an object measure?

anyanavicka [17]

Answer:

the amount of matter it contain

5 0

3 years ago

Read 2 more answers

An ideal gas at a given initial state expands to a fixed final volume. would the work be greater if the expansion occurs at cons

crimeas [40]

Answer:

Constant pressure

Explanation:

At constant pressure,

$w = -p\Delta V = -p(V_{f} - V_{i})$

At constant temperature,

$w = -RT \ln \left(\dfrac{V_{f}}{V_{i}} \right)$

1 mol of an ideal gas at STP has a volume of 22.71 L.

Let's compare the work done as it expands under each condition from an initial volume of 22.71 L.

Isobaric expansion

$w = -100p(V_{2} - 22.71}); \text{(1 bar$\cdot$L = 100 J)}$

A plot of -w vs V₂ gives a straight line (red) with a constant slope of 100 J/L as in the diagram below (Note that w is work done on the system, so -w is the work done by the system). \

Isothermal expansion

$w= -8.314 \times 273.15 \ln \left(\dfrac{V_{f}}{22.71} \right)\\\\= -2271 \left( \ln V_{f} -\ln22.71 \right)\\= -2271 \left(\ln V_{f} - 3.123 \right)\\= 7092 - 2271\ln V_{f}$

A plot of -w vs V₂ is a logarithmic curve. Its slope starts at 100 J/mol but decreases as the volume increases (the blue curve below).

Thus, the work done during an expansion at constant pressure is greater than if the system is at constant temperature.

4 0

3 years ago