Question 2 (1 point) Given the following UNBALANCED equation,
Ca + HCl → CaCl2 + H2
what are the correct coefficients?
а
b
2,1,2,1
3,2,1,1
1,2,1,1
с
d
1,1,1,2
e
2,2,2,1

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest

Rays from the sun are not considered matter true or false

Which of these statements best explains why space exploration should be encouraged? it prepares humans to live without oxygen. it dispel myths about objects in space. it prevents comets and asteroids from striking earth. it creates technology to absorb harmful radiations in space.