The smallest unit of an element that retains the chemical and physical properties of an element is an Atom.
<span>This problem is not about chemistry it is about math. the half-life of a certain thing is the time that it needs to decay 50% of what it had before. so if there is 4g, after 1 half there will be only 2g. so to become 1g it is passed 2 half-lives. 4,0g, 2,0g, 1,0g so it is the time divided by 2( numbers of half-lives). So the half-life of Francium 210 is 2,6 min.</span>
Answer:
3.27 minutes
Explanation:
To solve this problem we will first convert miles/hour to km/min. For this purpose we will require following reference conversions as;
1 Mile = 1.60934 Km
And,
1 Hour = 60 min
Therefore,
As,
1 Mile = 1.60934 Km
Then,
74 Miles = X Km
Solving for X,
X = 74 miles × 1.60934 Km ÷ 1 mile
X = 119.10 Km
Therefore,
119.10 Km were travelled in = 60 min
So,
6.50 Km will be travelled in = X min
Solving for X,
X = 60 min × 6.50 Km ÷ 119.10 Km
X = 3.27 minutes
