Yes that fits!

Hello, I don't know the specifications of your notebook. If you have a second slot there and the specifications basically fit, you can use this memory rail, but I wouldn't recommend it! You should never mix different brands and different sizes/specifications of RAM. Therefore, when updating, I would either use a large bar or two identical bars (from a set of 2 that are matched to each other). Hope I could help you with this answer. Greetings Arcuos

With a 2666 motherboard? Actually, yes, but it's not the maximum performance you can get out of it. It's best to check the motherboard manual to see if 2133 works (there are always peculiarities), but I'm leaning towards a 99% "yes".

Unfortunately, I can't tell you whether the RAMs are compatible with a Dell because I have installed the RAMs in two Acer. One with an i5-7300 HQ and the other with an AMD Ryzen 5 2500U and the RAMs run great in both.

Hello, unfortunately I have not tried this RAM on an HP Pavilion 15-bc094nz

No, see Apple recommendations for upgrading RAM on iMac (Retina 5K, 27", 2019): Use SO-DIMMs (Small Outline Dual Inline Memory Modules) that meet ALL of the following criteria: - PC4-21333 - without buffer - without parity - 260-pin - DDR4 SDRAM with 2666 MHz https://support.apple.com/de-de/HT201191#27inch2019 PS: Number of memory slots....4 Base memory......8 GB (two 4 GB DIMMs) Maximum memory.....64 GB (four 16 GB DIMMs)

You will have to remove the existing RAM bars as the unit only has 2 RAM slots according to the specification https://support.hp.com/gb-en/document/c05250258#AbT0. HP does not specify the form factor or the number of pins, but laptops usually use SODIMM. The following website confirms my assumption about the SODIMM bars: https://www.mrmemory.co.uk/memory-ram-upgrades/hp/pavilion-notebook/15-bc057nz. In this case, these Corsair RAM bars are compatible.