Answer: Which Group 1A elements are less dense than pure water at 4 degrees C? Li Na K. How does density vary with temperature? Temperature up, density down.
Explanation:
Answer:
see below
Explanation:
A. (1.8 X 10^20) X (2.5 X 10^16)
= 4.5 x 10³⁶
B.(7.9 X 10^9) - (6.0 X 10^8)
= 7.3 x 10⁹
C. (9.2 X 10^19) ÷ (3.0 X 10^7)
= 3.067 x 10¹²
D. (4.2 X 10^9) + (8.0 X 10^18)
= 8.00000002042 x 10¹⁸
In the modern periodic table, the elements are arranged in order of increasing atomic number. (In Mendeleev's table, they were arranged in order of increasing atomic weight). More elements are in the modern periodic table which have been discovered since Mendeleev's time.
There is little fundamental difference between "natural" fuels such as wood and fossil fuels such ascoal and oil. Both contain the same combustible substances essential oils and body fats from dead plants and animals.
Answer:
48 000 cm^2
Explanation:
8000 1cm cubes
each 1 cm cube side is 1 cm^2 and there are six sides to the cube , so each cube has 6 cm^2 surface area
and there are 8000 of them 8000 * 6 cm^2 = 48 000 cm^2