the entities in a nuclear reaction that consist of helium atoms are known as?

A piece of unknown substance weighs $44.7 \mathrm{~g}$ and requires $2110 \mathrm{~J}$ to increase its temperature from $23.2^{\circ} \mathrm{C}$ to $89.6^{\circ} \mathrm{C}$. (a) What is the specific heat of the substance? (b) If it is one of the substances found in Table 9.1, what is its likely identity?

What is the age of mummified primate skin that contains 8.25$\%$ of the original quantity of $^{14} \mathrm{C}$?

The temperature of the cooling water as it leaves the hot engine of an automobile is 240 $^\circ \mathrm{F}$. After it passes through the radiator it has a temperature of 175 $^\circ \mathrm{F}$. Calculate the amount of heat transferred from the engine to the surroundings by one gallon of water with a specific heat of 4.184 J/g $^{\circ} \mathrm{C}$

Yesterday's drug can be today's poison. Cocaine enjoyed a much better reputation 100 years ago, when it was used as a stimulant in many products (including Coca-Cola) as well as in drops to treat toothaches and depression. Identify three molecules that are produced by hydrolysis of cocaine.

How can chemical reactions contribute to global climate change?

What is a street name for crack cocaine? Describe this illegal drug.

Define viscosity.

a)Viscosity is defined as the ability to flow easily. If a substance is able to flow, its molecules must be held together and highly attracted to one another, which means the substance has strong IMFs

b)Viscosity is defined as the resistance to flow. If a substance is resistant to flowing, its molecules must be held together and highly attracted to one another, which means the substance has strong IMFs

c)Viscosity is defined as the resistance to flow. If a substance is resistant to flowing, its molecules must be held together and highly attracted to one another, which means the substance has weak IMFs

d)Viscosity is defined as the ability to flow easily. If a substance is able, its molecules must be held together and highly attracted to one another, which means the substance has weak IMFs

A Bronsted-Lowry acid is defined by its ability to?

The isotope $^{208} \mathrm{Tl}$ undergoes $\beta$ decay with a half-life of 3.1 min. (a) What isotope is produced by the decay? (b) How long will it take for 99.0$\%$ of a sample of pure $^{208} \mathrm{Tl}$ to decay? (c) What percentage of a sample of pure $^{208} \mathrm{Tl}$ remains un-decayed after 1.0 h?

The energy that is associated with the motion of an object is called?

Consider the titration of 100.0 mL of 0.100 M HCN by 0.100 M KOH at $25 ^ { \circ } \mathrm { C } . ( K _ { \mathrm { a } }$ for $\mathrm { HCN } = 6.2 \times 10 ^ { - 10 } . )$ a. Calculate the pH after 0.0 mL of KOH has been added. b. Calculate the pH after 50.0 mL of KOH has been added. c. Calculate the pH after 75.0 mL of KOH has been added. d. Calculate the pH at the equivalence point. e. Calculate the pH after 125 mL of KOH has been added.

An aqueous solution of a strong base has a $\mathrm{pH}$ of $11.04$ at $25^{\circ} \mathrm{C}$. Calculate the concentration of the base if the base is $\mathrm{KOH}$

Balance the following equation:

$$\mathrm{Ca}(\mathrm{OH})_2(a q)+\mathrm{H}_3 \mathrm{PO}_4(a q) \longrightarrow \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2(s)+\mathrm{H}_2 \mathrm{O}(l)$$