Answer:
True
Explanation:
when a physical change occurs in a substance, the appearance might change but the chemical identity remains same. For example, if liquid water is heated, the water changes to gaseous form .This means the appearance of the water has changed, but the chemical identity remains same as both liquid water and steam has both oxygen and hydrogen as the component molecules or atoms.
Answer:
Distance measures length. For example, the distance of a road is how long the road is. In the metric system of measurement, the most common units of distance are millimeters, centimeters, meters, and kilometers.
Explanation:
Answer:
true
Explanation:
the air is thinner as you climb
IUPAC name of Na2O is sodium oxide.
<h3><u>Explanation</u>:</h3>
Na2O is the ionic compound containing sodium and oxygen in molar ratio of 2:1. This compound is named by International Union for Pure and Applied Chemistry as Sodium oxide.
This substance is used in a varied number of cases. Its the anhydride of the popularly used base sodium hydroxide. So adding waste produces sodium hydroxide solution. Its used in glass and ceramic factories too. Sodium silicates are also produced from this substance. Its also used to produce soda ash.
Answer:
Explanation: ques 8
I think so it is a hydrogen atom ,because it is only atom atom that has 1 proton .as the question is to identify the atom with no of proton so it is hydrogen . it has atomic number 1
ques 9
the isotpoe of hydrogen having 2 neutrons is caled tritrium . it has mass number 3
ques no 10
as the protons are present in nucleus and electrons revovle around it so the term is clear . remember atoms do not have defined boundaries .
