Recent Homework Questions About Substance Abuse
A control group is used to see if the same results would occur without the independent variable. An independent variable is the potential stimulus or cause, usually directly manipulated by the experimenter, so it could also be called a manipulative variable. A dependent ...
Saturday, December 7, 2013 at 10:13pm
Ions are electrically charged particles that are formed when certain compounds are dissolved in water. These solutions will conduct electricity. The Swedish scientist Svante Arrhenius coined the term ion (which means wanderer) to explain why solutions of electrolytes will ...
Saturday, December 7, 2013 at 11:14am
A 56.59 g sample of a substance is initially at 20.5 °C. After absorbing 1267 J of heat, the temperature of the substance is 116.5 °C. What is the specific heat (c) of the substance?
Thursday, December 5, 2013 at 3:24pm
1) What would be the preferred heating device (s) in each of the following situations? a) reflux a solvent with a 56 degree Celsius boiling point b) reflux a solvent with a 110 degree Celsius boiling point c) distillation of a substance that boils at 220 degree Celsius 3) What...
Thursday, December 5, 2013 at 11:07am
Match these with the key terms (1) A form of energy that is always transferred from a warmer substance to a cooler one. (2) device that converts hear to a small amount of electric energy often used in temperature sensors. (3) A Push button barbecue lighter produces a small ...
Monday, December 2, 2013 at 4:13pm
If you use the equation for heat released/absorbed to support your explanation, Q = m*c*(T2 - T1) where m is the mass, c is the specific heat capacity and T is the temperature. Since the only substance involved is water, c is the same for both systems. We can also say that the...
Sunday, December 1, 2013 at 7:52pm
Because it absorbs heat change its state from liquid to gas. This is called the latent heat, and it is a constant-temperature process. If the temperature changes without changing the state of a substance, it is called sensible heat. Hope this helps :3
Sunday, December 1, 2013 at 7:26pm
Health (Ms. Sue)
1. What are two ways that society could deal with future concerns about genetic information? A: ? 2. Identify how keeping person health records can help a person cope with hereditary diseases. A: Keeping personal health records can help a person cope with hereditary diseases ...
Saturday, November 30, 2013 at 5:13pm
A pharmaceutical preparation of pH 6.2 is preserved with substance A (pKa 8.5). If the preservative effect is due to the undissociated molecule determine the per cent of active preservative present in the preparation. Thanks! :)
Friday, November 29, 2013 at 2:48pm
One microgram is equal to 1x10^-6 gram. If the mass of a substance is 8x10^9 micrograms, what is its mass in grams? a) 1.25x10^-15 b) 1.25x10^-3 c) 8x10^3 d) 8x10^15
Wednesday, November 20, 2013 at 6:02am
Use a calculator to help solve the problem. An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr
Monday, November 18, 2013 at 7:38pm
Advanced Chem- Intermolecular Forces of Attraction
Answer/ explain the following in terms of intermolecular forces and properties of the substances referred to in each situation. 1. Why is it that if a glass is slightly filled above the brim with water, the liquid does not overflow? 2.Induced dipole forces or London force of ...
Monday, November 18, 2013 at 6:03am
An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr
Sunday, November 17, 2013 at 4:10pm
The brown sugar contained a substance that made the cookies have more bulk.
Wednesday, November 13, 2013 at 7:23pm
Health (Ms. Sue)
1. Explain the relationship between the following key terms. a. physical dependence and withdrawal b. drug and medicine c. drug tolerance and addiction d. over-the-counter medicine and prescription e. active ingredient and drug interaction f. alcohol abuse and alcoholism g. ...
Monday, November 11, 2013 at 3:43pm
How do you determine the heat of solution for a substance? how can we report this answer in both kJ/g and kJ/mol? thank you!!!
Monday, November 11, 2013 at 2:23pm
I am my truest and purest self, a mere child embarking on the beginning of life. So, how can it be that my mother, my main source of comfort, can possibly be dying? Stage 4 Metastases Melanoma Cancer: the doctor says is the grim diagnosis, the definite fate that we have no say...
Sunday, November 10, 2013 at 9:37am
a physical change is when a surtain substances into another substance but is able to change back to the way it was E.G. ice turning into water and water into ice. A chemical change is when a substance changes into a completly different substance and is unable to change back to...
Saturday, October 21, 2006 at 10:00am