Answer:
False, the object is stationary therefore the object is balanced.
Explanation:
A mixture is two or more substances that have been combined together but each substance is not changed chemically.Examples of mixtures include:<span>1. Sea water. This is a mixture of water and various salts.</span><span>2. Gunpowder. This is a mixture of potassium nitrate, sulfur and carbon. </span><span>3. Crude oil. This is a mixture of organic compounds, mainly hydrocarbons.</span><span>4. Ink. This is a mixture of colored dyes which can be separated using chromatography.</span><span>5. Dry air. Air is a mixture of nitrogen,oxygen, argon, carbon dioxide, neon and tiny traces of other gases.</span>
Answer:
Skunkworks
Explanation:
A team which is assembled to achieve a specific purpose in a given amount of time. The team focuses on the research and development aspect of a product.
Here, Chang has invented a material that might have an application as a deck sealant. So, how the product can be marketed is a question that needs to be answered, this is the specific goal. The goal needs to acheived quickly as competitors might invent the same product and gain a lead in the market.
Hence, the group could be referred to as skunkworks.
Answer:
2.15 mg of uranium-238 decays
Explanation:
For decay of radioactive nuclide-
where N is amount of radioactive nuclide after t time, is initial amount of radioactive nuclide and is half life of radioactive nuclide
Here , and
So,
so, N = 2.446 mg
mass of uranium-238 decays = (4.60-2.446) mg = 2.15 mg
The molar mass of nitrogen is 14 bt since it is a nitrogen molecule (N2) the molar mass will be 14 x 2 = 28g/mol.
Step 1: Calculate the moles of N2
moles = mass / relative molecular mass
= 50g / 28g/mol
= 1.7857mol
Step 2: convert the moles of nitrogen into volume of N2
At STP the molar volume of a gas is 22.71L/mol
Hence the volume = 1.7857mol x 22.71L/mol
= 40.55L
50g if nitrogen (N2) has a volume of 40.55 liters at stp.