<span>21.6 grams
The balanced equation for the reaction is
Cu + 2AgNO3 ==> 2Ag + Cu(NO3)2
So you can easily determine that for each mole of copper used, 2 moles of silver are produced. So let's lookup the atomic weights of copper and silver.
Atomic weight copper = 63.546
Atomic weight silver = 107.8682
Moles copper = 6.35 g / 63.546 g/mol = 0.099927611 mol
Since we'll produce 2 moles of silver per mole of copper used, we get
0.099927611 mol * 2 = 0.199855223 mol
And to get the mass, just multiply by the atomic weight of silver. So
0.199855223 * 107.8682 = 21.55802316 g
Finally, round to 3 significant figures, giving 21.6 g.</span>
Answer:
B. Controlled variables
Explanation:
The Dependent sample t-test compares the mean score of measurements in one group to that of another other group. It mainly used when analyzing comparable sample units as it pairs repeatable observations within a time frame.
Controlled variables are factors that are not tested and remain constant. Some examples of controlled variables are temperature, pressure, volume etc
Carbon Reasons: (1) Quicklime is produced by the thermally decomposing limestone, which produces carbon dioxide as a byproduct
<span>CaC<span>o3 --> </span>CaO+C<span>O2
</span></span>
(2) Since this reaction requires a large amount of energy, fuel (usually coal) is burned, which produces carbon dioxide
Answer:
Scientists use the scientific method because it is evidence-based, standardized and objective in conducting experiments. The scientific method allows scientists to stick to facts and to avoid the influence of preconceived notions and personal biases in research processes, improving the credibility of research findings.
Explanation:
