How many significant digits should be reported in the answer to the following calculation?

Answer These questions

1. How many significant digits should be reported in the answer to the following calculation?

(4.3 – 3.5) × 22.3 =

2. What is the density (g/mL) of a substance that has a mass of 8.47 g and, when placed into a graduated cylinder, causes the water level to rise from 25.26 mL to 45.47 mL?

3.Determine the mass (in kg) of a silver sphere with a diameter of 57.1 in.

4.An iron sphere has a mass of 76.1 g. Find the radius (in cm) of the sphere.

5. How many mg of codeine should be administered to someone who is 32.57 pounds? The doctor has prescribed 12.0 mg per kg of body weight.

6. You are designing the garden of your dream and you are going to start with a blank canvas. That means killing everything before putting down new plants. To do this, you are going to use herbicide to kill the overgrown weed.

You have a lot of land that measures 26.8 yard by 20.4 yard. Each bottle of herbicide holds 12 fluid oz (fl oz). The instruction says to mix 1.7 fl oz with 1.0 gallon of water and that will treat an area of 155 ft2. How many bottles of herbicide will you need?

Remember that you can’t buy a fraction of a bottle but for this purpose, let’s pretend that you can. Report the answer to the correct number of significant figures.

7. Gold is mined at Cortez Gold Mine in Nevada. For every ton of raw material dug out of the ground, you get one ounce of gold. Each truck hauls 354 tons, and each day, there are 1000 trucks that haul material out of the ground. Assuming the current price of gold to be $1,505 per ounce. How much money is made each day at Cortez Gold Mine?

Do not put the answer in scientific notation. Report the answer to the nearest dollar.

8. Scientists have discovered a new element! This element has three naturally occurring isotopes. The first isotope has a natural abundance of 5.46% and the second has a natural abundance of 49.38%.

The isotopic mass of the first isotope is 173.432 amu, the second is 174.234 amu, and the last isotope is 172.341 amu.

Calculate the atomic mass (in amu) for the new element.

9. A new element has been discovered. This element has an atomic mass of 120.846 amu and only two naturally occurring isotopes. The first isotope has a natural abundance of 45.71% and an isotopic mass of 119.345 amu. What is the mass of the other isotope in amu?

10. he gold foil experiment performed in Rutherford’s lab ________.