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## PowerPoint Slideshow about ' Midterm Review Do- Nows' - armine

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Copy and answer the questions below:

- 1. Convert -240°C to Kelvin.
- 2. A student decomposes 123g of KClO3. After the reaction, he measures 75g of KCl in the container. How many grams of O2 were released? Which law is this?

2 KClO3 2KCl + 3 O2

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A student does an experiment to find the amount of heat released when different masses of sodium hydroxide dissolve in water. His data are given below:

1. Identify the independent and dependent variables.2. Which mass has the greatest precision? EXPLAIN.3. The correct heat for 1g is 225cal. How is the student’s accuracy? EXPLAIN.

The independent variable is the mass of sodium hydroxide.

The dependent variable is the amount of heat released.

1g had the greatest precision. The values are most alike.

The accuracy is not very good. Accuracy is how far the answer is from the accepted value. The average experimental value is 202 cal, which is not close to 225 cal.

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1. Arrange the following in order of increasing frequency: X-ray, Gamma Rays, Radio Waves2. If the energy of a wave doubles, what happens to the frequency?3. If the energy of a wave doubles, what happens to the wavelength?

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The half-life of an isotope of uranium is 14.0 minutes. What mass of a 200g sample of the isotope will remain after 56 minutes?

Complete the following nuclear equations:

2. 200g 100g 50g 25g 12.5g 12.5g

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Element X has three isotopes. Their masses and relative abundance are listed below. Find the atomic mass of element X.

Isotope 1 mass = 42.5amu abundance = 23%

Isotope 2 mass = 40.1amu abundance = 58%

Isotope 3 mass = 43.5amu abundance = 19%

What is an isotope?

What is an ion?

42.5 x 23 + 40.1 x 58 + 43.5 x 19 = 4129.8

4129.8 / 100 = 41.298 amu

Isotopes are atoms of the same element with a different mass. This means they have the same atomic number (protons), but a different number of neutrons.

Ions are charged particles. They have a different number of protons than electrons.

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STUDY THE LIST OF ELEMENTS BELOW:

Si, Xe, Ar, Rb, I, Al

Answers can be used more than once or not at all!

Which of the elements above:

Has the largest radius?

Forms a +1 ion?

Forms a +3 ion?

Has the greatest electronegativity?

Has the greatest ionization energy?

Is diatomic?

Is a metalloid?

Forms a -1 ion?

STUDY THE LIST OF ELEMENTS BELOW:

Si, Cl, Ar, Rb, Xe, Al

Answers can be used more than once or not at all!

- Which of the elements above:
- Has the largest radius? Rb
- Forms a +1 ion? Rb
- Forms a +3 ion? Al
- Has the greatest electronegativity? Cl
- Has the greatest ionization energy? Ar
- Is diatomic? Cl
- Is a metalloid? Si
- Forms a -1 ion? Cl

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