Students used pieces of string to model the orbits of the inner planets. They measured the lengths of the strings and recorded
the values in a table. Which table correctly shows the
relationship between the positions of the planets and the relative
lengths of their orbits?
a)
Planet
String Length
Mercury
25 cm
25 cm
Venus
Earth
25 cm
Mars
25 cm
N
String Length
b)
Planet
Mercury
Venus
Earth
Mars
25 cm
22 cm
18 cm
15 cm
String Length
c)
Planet
Mercury
Venus
Earth
Mars
15 cm
22 cm
18 cm
25 cm
String Length
d)
Planet
Mercury
Venus
Earth
Mars
15 cm
18 cm
22 cm
25 cm

The reactions shown here can be combined to make the overall reaction c(s) + h2o(g) ⇌ co(g) + h2(g) by reversing some and/or dividing all the coefficients by a number. a. c(s) + o2(g) → co2(g) k=1.363×10^69 b. 2 h2(g) + o2(g) → 2 h2o(g) k=1.389×10^80 c. 2co(g) + o2 (g) → 2 co2(g) k=1.477×10^90

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of tthe table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 9 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

In science class richard learns that a substance has a boiling point of 230 fahrenheit his teacher ask him to convert this temperature to degrees celsius what is the boiling point of his substance in degrees celsius