Which element has chemical properties that are most similar to those of calcium?

(1) Co (3) N

(2) K (4) Sr

Given the reaction: NH3 + HCl - - > NH4Cl In this reaction, ammonia molecules (NH3) act as a base because they (1) accept hydrogen ions (H+) (2) accept hydroxide ions (OH-) (3) donate hydrogen ions (H+) (4) donate hydroxide ions (OH-)

Given the following data, determine the rate constant of the reaction 2NO (g) + Cl2 (g) - -> 2NOCl (g) Experiment [NO] (M) [Cl2] (M) Rate (M/s) 1 0.0300 0.0100 3.4 x 10-4 2 0.0150 0.0100 8.5 x 10-5 3 0.0150 0.0400 3.4 x 10-4

at 30°C 80 g of sodium nitrate is dissolved in 100 g of water is a solution saturated and unsaturated or supersaturated

what mass of hgbr2 can be produced from the reaction of 5.00 ml mercury (density = 13.6 g/mL) and 5.00 ml bromine (density = 3.10 g/ml) ?

When magnesium OMg) and sulfur (5) bond, what would be the charge of magnesium after the bond is made?

What element is represented by the following electron configuration: 1s22s22p63s23p64s23d4 Question 2 options: Cr Ca Ge Ar

He substance, cocl2, is useful as a humidity indicator because it changes from pale blue to pink as it gains water from moist air. What is its name?

The weighted average atomic mass of an element depends upon the a. relative abundance of protons in the element b. mass and relative abundance of each isotope of that element c. mass and relative abundance of each neutron of that element d.

What part of an atom do we change for isotopes

The Safe Drinking Water Act (SDWA) sets a limit for mercury-a toxin to the central nervous system-at 0.002 mg/L. Water suppliers must periodically test their water to ensure that mercury levels do not exceed 0.002 mg/L.