Answer:
Explanation:
1. Rounding
2 0<u>83 193</u> cm
You want to round to two significant figures.
You replace all the underlined digits (all those after the first two digits) with zeroes.
The rule is: If the first figure dropped (8) is greater than 5, increase the last figure kept (0) by 1.
Then, 2 0<u>83 193</u> cm becomes 2 100 000 cm
2. Converting to scientific notation
A number in scientific notation has the form
N × 10ⁿ
where N is a decimal number called the mantissa and n is an integer called the exponent.
We must have 1 ≤ N < 10
(a) Determine the mantissa
Move the decimal place to the left to create a new number between 1 and 10.
2 1<u>00 000</u> ⟶ 2.1<u>00 000</u>; N = 2.1
(b). Determine the exponent.
The exponent is the number of times you moved the decimal to get the mantissa.
You moved the decimal six places to the left, so the exponent n = 6.
(c). Write the number in scientific notation
Answer:
well the cold thing would melt unless u but in like a cooler or one of those lunch boxes that is like a cooler but u put ice packs in them to keep the thing cold
Explanation:
Answer:
Solution is 4.67% by mass of salt
Explanation:
% by mass is the concentration that defines the mass of solute in 100g of solution.
In this case we have to find out the mass of solution with the data given:
Mass of solution = Mass of solute + Mass of solvent
Solute: Salt → 14.2 g
Solvent: Water → 290 g
Solution's mass = 14.2 g + 290g = 304.2 g
% by mass = (mass of solute / mass of solution) . 100
(14.2 g / 304.2g) . 100 = 4.67 %
Answer:
Choice B., infrared radiation
Explanation:
A gas in atmosphere which allows the incoming of the solar radiation to reach Earth's surface and on the other hand also absorbs these radiation which are re-emitted as heat, trapping heat in atmosphere and causing temperature to rise is called green house effect.
<u>For example, carbon dioxide is a greenhouse gas which traps heat from sun resulting in the warming the planet
.</u>
<u>Thus, infrared radiations which is a source of heat is reflected back to the Earth’s surface by greenhouse gases.</u>
A unit cell is a simplest repeating unit in a crystal in which particle are freely vibrating
Sodium chloride having face centered cubic lattice in which sodium and chloride ion are arranged and vibrating.
The sodium ion are arranged on eight corners of the cube whereas they are also present on all the six centres of all six faces.
Thus, number of Na+ ion
Hence total of 14 sodium ions are present in NaCl lattice.