b. when atoms share electrons.
c. between metals and nonmetals.
d. when electrons are transferred from one atom to another.
Answer:
6) V 7) M 8) V 9) D 10) D 11) M 12) D 13) V
Explanation:
Volume- cm^3, ml, etc.
Mass- g/cm^3, g/ml, etc.
Density- g, kg, etc.
number of particles are present in 3 moles.
The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
1 mol =
We know that 1 mol =
so, 3 mol =
Thus, the number of particle is
Learn more about moles, here:
evaporation of water from the ocean
condensation of water vapor to form clouds
hydrogen and oxygen gas combining to form water vapor
Answer : The correct option is hydrogen and oxygen gas combining to form water vapor.
Explanation :
Phase change : It is a change from one state to another state without changes in chemical composition.
Phase change such as solid to liquid, liquid to vapor, vapor to liquid, liquid to solid, vapor to solid, solid to vapor.
Answer: 656 mmHg
Explanation:
Manometers are used to measure the pressure in a container by comparing it to normal atmospheric pressure.
First convert the atmospheric pressure to mmHg
1 torr = 1 mmHg
Therefore, the atmospheric pressure = 742 mmHg
Since the arm connected is higher than the level of the Mercury open to the atmosphere, then the gas pressure is lower than the atmospheric pressure.
Hence,
Pgas = Patm - change in height
Pgas = 742 mmHg - 8.6 cmHg
Balance the unit: 10 mm = 1 cm
Then,
Pgas = 742 mmHg - 86 mmHg
Pgas = 656 mmHg
The gas pressure in the container is 656 mmHg.