<span>The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At) are the elements found along the step like line between metals and non-metals of the periodic table.</span>
Answer:
11) E
12) C
13) M
14) C
15) M
16) M
17) C
18) E
19) C
20) M
Explanation:
An element is a pure substance such as gold and silver. You can find those elements in the periodic table. A compound is a substance consisted of molecules from two or more different elements. Water is made up of hydrogen and oxygen (H2O). Sugar is a very wide category of compounds. Carbon dioxide is made up of carbon and oxygen (CO2). Ice is frozen water/water in the solid state (H2O). A mixture is a group of substances held together physically. Seawater is a mixture of water and salt. A chocolate sundae is a mixture of chocolate sauce and ice cream. Air is a mixture of many gases including oxygen and nitrogen. A big mac is a mixture of burger meat, lettuce, tomatoes, etc.
<span>magnesium oxide is a compound that is composed of one atom of magnesium and two atoms of oxygen. The compound is a combination of Mg2+ ion and O2-. The ions translate into atoms which reflects on the subscripst of the elements already. magnesium oxide is a basic oxide with the pH level greater than 7.</span>
Answer:
6.61%
Explanation:
You know that the equation to find the mass percent is "mass(%) = (mass of solute)/(mass of solution)". Now, to find the mass of solute (NaCl), we know that it is given by 1.2 moles/liter and its molecular weight is 58.44 g/mol, so if you multiply those quantities the result will be 70.128 g/liter. And now we need to calculate the mass of solution, that is given by the density of solution multiplied by the volume (1000ml). Finally we just need to divide the mass of solute (70.128) by the mass of solution (1060) and multiply it by 100.
Density is determined by dividing the MASS of a sample by the VOLUME of the sample.