Answer:
2 atoms of aluminium makes a molecule of aluminium
1) List the reactants: sodium bicarbonate (NaHCO₃) and citric acid (H₃C₆H₅O₇).
Reactants undergo change during a chemical reaction.
2) List the products: water (H₂O), carbon dioxide (CO₂) and sodium citrate (Na₃C₆H₅O₇).
Products are the substances formed from chemical reactions.
3) The balanced chemical equation:
3NaHCO₃ + H₃C₆H₅O₇ → 3H₂O + 3CO₂ + Na₃C₆H₅O₇.
Answer:10,0000 years
Explanation:
If it takes 2000 years to weather 1cm of limestone
It will take 5*2000 years to weather 5cm of limestone. This gives us 10000 years.
<span>Drill bits are attached to power drills to make holes. Drill bits are made of carbon-steel because they’re hard and resistant to corrosion. However, it is not only limited to carbon-steel. There are also other materials that are used for drill bits such as high speed steel, titanium coated steel and the like. The bodies and handles of power drills are made of polyethylene because they’re good insulators. </span>
Answer: -
The concentration of solution which contains 2.5 g of sugar dissolved in 50 g of water is 5 % (w/w)
Explanation: -
Amount of sugar = 2.5 g
Mass of water = 50 g
Concentration of sugar = 
x 100
= 5%
Thus the concentration of sugar is 5 % (w/w)
