Answer:
The half-life varies depending on the isotope.
Half-lives range from fractions of a second to billions of years.
The half-life of a particular isotope is constant.
Answer:
Bi2(SO4)3
Explanation:
Bismuth(iii) sulfate is an ionic compound therefore, their is transfer of electron. Ionic compound has both cations and anions. The cations is positively charged ion while the anions is negatively charged ions. The cations loses electron to become positively charged while the anions gains electron to become negatively charged.
From the compound above, Bismuth(iii) sulfate the cations will be Bismuth ion which loses 3 electrons. The anions is the sulfate ion (S04)2- with a -2 charge.
The chemical formula can be computed from the charge configuration as follows
Bi3+ and (SO4)2-
cross multiply the charges living the sign behind to get the chemical formula
Bi2(SO4)3
Note the final chemical formula, the numbers are sub scripted
Methyl Red, also called C.I. Acid Red 2, is an indicator dye that turns red in acidic solutions.
Phenolphthalein is a sensitive chemical with the formula C20H14O4 (often written as "HIn" in chemistry shorthand notation). Often used in titrations, it turns from colorless in acidic solutions to pink in basic solutions. If the concentration of indicator is particularly strong, it can appear purple. A phenolphtalein turns a bright orange color, in a solution containing a ph below 0.
Answer:
1. Measuring the weight of an apple- scale.
2. Studying a distant object- telescope.
3. Studying a very small object- microscope.
4. Measuring the length of a book- ruler.
5. Measuring the temperature of a cup of tea- thermometer.
Explanation:
1. A scale or measuring scale is used to measure or take the weight of any object. It can be either an analog or digital scale as long as the measurements can be taken from it. So, <u>measuring the weight of an apple can be done on a measuring scale</u>.
2. A telescope is an instrument that is used in scientific, especially in space explorations, to study a distant object in the universe/ sky. It gives a clear image and enables a person to view things closer than they are. So, <u>a telescope can be used to study distant objects</u>.
3. <u>A microscope is used to study very different small objects</u>, such as microbes and other organisms. It enlarges the objects to be viewed and thus, enables them to be studied in detail.
4. <u>A ruler may be used to measure the length of a book</u>. It has indications or marks by which the lengths can be taken.
5. <u>A thermometer is an instrument that is used to measure the temperature of anything</u>, be it a person or even other things such as food and even a cup of tea.
Answer:
Explanation:
Hello,
In this case, for each nitrate-based salt, we compute the nitrate moles as shown below:
We notice calcium nitrate has two moles of nitrate ion, sodium nitrate has one and aluminium nitrate has three. Hence we add the moles to obtain the total moles nitrate ion:
Finally, we compute the molarity:
Regards.
