Answer:
C. single replacement
Explanation:
In a single replacement reaction, one atom replaces another.
The general form of a single replacement reaction is: A + Bc ⇒ Ac + B
A + B × c ⇒ B + A × c
↓ ↓ ↓ ↓ ↓ ↓
Fe + Pb(NO₃)₂ ⇒ Pb + Fe(NO₃)₂
Iron switched places with lead so the reaction is a single replacement reaction.
Hope this helps.
D) 59 (protons+neutrons=mass)
Weather
Explanation:
Meteorology is the study of weather.
Meteorologists are scientists that helps to predict weather phenomenon around us.
The use several data gathered from different weather stations around to make precise predictions about the likelihood of a particular weather condition.
Meteorologists most times use computer models to predict and forecast both long and short term weather conditions.
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Warm because of the earths surface which rises up on to the crust from magma
Answer:
5.05 × 10²⁴ Zn Atoms
Explanation:
In order to find the number of atoms we will follow these two steps;
Step 1: <u>Finding out the moles of Zn as;</u>
Moles = Mass / A. Mass
Moles = 549 g / 65.38 g/mol
Moles = 8.397 moles
Step 2: <u>Calculating No. of Atoms as:</u>
According to Avogadro's Law, each mole contains 6.022 × 10²³ particles. These particles can be any entity i.e. atoms, molecules, formula units, ions e.t.c. So,
No. of Atoms = Moles × 6.022 × 10²³ atoms/mol
No. of Atoms = 8.397 mol × 6.022 × 10²³ atoms/mol
No. of Atoms = 5.05 × 10²⁴ Zn Atoms
