VincenTragosta - Tanya, Jawab, dan Belajar Tanpa Batas Logo

Questions in chemistry

[Terjawab] Which element in period 3 on the periodic table is a metalloid? A. magnesium (Mg) B. aluminum (Al) C. silicon (Si) D. sulfur (S)

[Terjawab] Which element has the smallest atomic radius? A. calcium B. potassium C. scandium D. titanium

[Terjawab] Predict the products of the reaction below. [tex]HClO_4+Ca(OH)_2 \rightarrow[/tex]

[Terjawab] If 75 g of active ingredient powder is mixed with 250 mL normal saline, what is the final concentration $(w / v)$?

[Terjawab] If the solubility of a salt is 40, what gram of solvent is required to dissolve 60 gm of the salt? A. 100gm B. 150gm C. 40gm D. 60gm

[Terjawab] Which polyatomic ion is $SO_4{ }^{2-}$? A. sulfate B. sulfite C. sulfide D. sulfurate

[Terjawab] The half-life of an isotope known as colbalt-60 is 5.26 years. What is the decay factor of this substance? (Hint: use the equation [tex]$y=c a^x$[/tex]) A. 0.877 B. 2.000 C. 0.026 D. 1.140

[Terjawab] It is important that you always use a clean stirring rod when dropping samples onto the pH indicator paper. True or False

[Terjawab] How would you explain the difference between -ide, -ate, and -ite endings? For example, how are nitride, nitrate, and nitrite different?

[Terjawab] Which element would most likely have an electron affinity measuring closest to zero? A. Na B. Ar C. Rb D. Ar