6.28×1013+7.30×1011 this =13741.94
        
             
        
        
        
In studying effects of collisions between galaxies, astronomers usually make use of space telescopes.
Astronomy deals with the study of outer space. The study focuses on planets and other celestial bodies. Generally telescopes are used to study outer space. The particular type of telescope that is used depends on the need.
In studying effects of collisions between galaxies, astronomers usually make use of space telescopes.
Learn more: brainly.com/question/556195
 
        
             
        
        
        
Answer:
Scientific theories are testable and make falsifiable predictions. They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy).
A good theory in the theoretical sense is (1) consistent with empirical observations; is (2) precise, (3) parsimonious, (4) explanatorily broad, and (5) falsifiable; and (6) promotes scientific progress (among others; Table 1.1).
 
        
             
        
        
        
Answer:
molecus in a gas cool down 
Explanation:
the molecules lose heat and energy do they slow down they move closer to other molecules and form a liquid 
 
        
             
        
        
        
Answer:
Explanation:
a. CuO+ 2HCl⇒CuCl2+ H2O
b.  =
=  = 0,05 (mol)
= 0,05 (mol)
⇒ =
=  =0,05 mol
=0,05 mol
⇒ = 0,05×135=6,75 (g)
= 0,05×135=6,75 (g)
c.  =2×
=2×  =0,1 (mol)
=0,1 (mol)
⇒ = 0,1×36,5= 3,65 (g)
= 0,1×36,5= 3,65 (g)
⇒ =
=  ×100=36,5 (g)
×100=36,5 (g)
⇒ Nồng độ phần trăm dd sau phản ứng= Nồng độ % dd CuCl2= ×100=
×100= ×100≈ 16,67%
 ×100≈ 16,67%