structure, properties, and reactions of matter.
A chemical is a substance that has the same
composition and properties wherever it is found.
What are four chemicals from the list?
A. Lucia notices that the dye in a design fades when the shirt is washed.
B. Lucia decides that the dye needs something to help it combine with the fabric.
C. She places a spot of dye on each of four shirts and then places each one separately in water, salt water, vinegar, and baking soda and water.
D. After one hour, all the shirts are removed and washed with a detergent.
E. Lucia notices that the dye has faded on the shirts in water, salt water, and baking soda, while the dye did not fade on the shirt soaked in vinegar.
F. Lucia thinks that the vinegar binds with the dye so it does not fade when the shirt is washed.
During an assessment in the emergency room, a nurse writes that the patient has a resting pulse of 30 beats/min.
A nurse thinks that an incision from a recent surgery that is red and swollen is infected.
Repeated studies show that lowering sodium in the diet leads to a decrease in blood pressure.
Drinking coffee at night keeps me awake.
If I stop drinking coffee in the afternoon, I will be able to sleep at night.
I will try drinking coffee only in the morning.
59/77= .766 = 77%
5/22= .227 = 23%
You can find the toxic level (or lethal dose) by multiplying the mass of the person by 1.5 g/kg body mass, which yields 90.0 g of ethylene glycol.
The concentration is used as a conversion factor to calculate how much ethylene glycol is in each drink, which contains 100 g of the liquid.
120g ethylene glycol600g liquid×100 g liquid=20.0g ethylene glycol
Lastly, dividing the lethal dose by the mass of ethylene glycol in each drink yields how many drinks the person must consume to reach that toxic level.
121/54= .224 = 22%
The concentration of ethylene glycol in the liquid can be expressed in a variety of ways. Dividing the mass of ethylene glycol by the total mass of the liquid yields the mass ratio, 0.224. The mass ratio is a decimal number, which is then converted to the mass percentage by multiplying it by 100%.