Which of the following statements is true as stated by the chemist Joseph proust?

Which one of these scientists discovered the atomic nucleus?

A fictional element has two isotopes and an atomic mass of 88.8 amu. If the first isotope is 86 amu and the second isotope has a mass of 90. amu. Which isotope has the greatest natural abundance?

To which family does krypton belong?

Which element is a metal, can have properties that are not always easily predictable based on its location on the periodic table, and starts with the letter ,,

When alcohol is combusted with oxygen, you produce carbon dioxide and water. If you produce 18 grams of water and 22 grams of carbon dioxide from 32 grams of oxygen, how many grams of alcohol were needed for the reaction?,,

Which group of three elements contains a nonmetal, a metal, and a metalloid?,,

All of the following statements about different elements are true EXCEPT:

If they form an ion which of the following elements, would have a +2 charge?

Your physician has told you to increase your potassium intake by eating more bananas. The problem is, he wrote this down in terms of moles and not bananas. He said to eat at least 0.0216 moles of potassium per day. An average banana contains about 422 mg of potassium. How many bananas do you need to eat each day?

When answering the question of what I would do for a Klondike bar, I said I would jump into the Nile river with a crocodile while wearing 5.50 x 1025 atoms of lead on my body. What would be the mass of this lead in kg?

What is the molar mass of calcium permanganate?

1.00 mole of O2 contains the same number of oxygen atoms as:,,

Suppose I lay before you 5.0 gram samples each of Sr, Zr, Co, and Te. Which of these samples would contain the smallest number of moles?

A copper wire has a diameter of 2.00 mm. What length of this wire contains exactly 1.00 mol of copper? (density of Cu = 8.92 g/cm3)

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

Suppose you pull off the broken tungsten filament in a burned-out incandescent light bulb. You take its mass and find it to be 0.100 grams. How many atoms of tungsten are in this filament

I recently had my house fumigated with methyl bromide (CH3Br). I paid for 2.00 kg of CH3Br. How many moles does this represent?

A certain reaction is exothermic. Therefore, the reverse of this same reaction must be a(n)

As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will:

Determine which of these substances will have the highest temperature after absorbing 500.0 kJ of heat. Assume that all substances are starting at the same initial temperature and are of equal mass.

Which scientist helped develop the cell theory?

Which of the following is the best scientific question for proposing a hypothesis and designing an experiment on the effect of a drug (Drug X) on decreasing blood pressure?,,

Jaques Cousteau’s observations aboard the Calypso contributed to what type of science?,,

When you click on the button for the same mass what is volume of the yellow block?,,

What is the density of the aluminum block?