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Hydrogen, H, is a nonmetallic gas and the first element in the periodic table. Why is hydrogen placed on the far left column along the metals, rather than being placed adjacent to the gases on the far right columns?

You are provided a 0.9 M NaCl solution and asked to dilute it to 0.7 M solution. If you want to get 200 ml of the 0.7 M solution, how much 0.9 M solution and how much water do you need to add?

07 Add:

Genetic variability is generated in sexual reproduction as a result of the following processes, except __________ .

10 Simplify:

13 Solve:

Cell division by meiosis results in ___________ .

Earth and the Moon are gravitationally attracted to the Sun, but they don’t crash into the Sun. A friend says that is because Earth and the Moon are beyond the Sun’s main gravitational influence. Other friends look to your a response. What do you say?

Calculate the expression: x = 2+3. What is the value of x?

Felipe and Marsha were studying forces and decided to do an experiment. They placed four equally sized blocks made of different materials on an elevated plastic tray. They watched each of the blocks move down the tray. Their setup is shown below. Capture(2).PNG Which of the following forces causes the blocks to move down the tray?