Answer is: step 3 would be placed C.
This is example of chemical change (chemical reaction), because new substances are formed (gas is emitted), the atoms are rearranged.
Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the psysical change, just with different form or state of matter.
Chemical reaction: powder + water → new substance + gas.
it will be in group 16 of the periodic table and they are called chalcogens
and it's categorize as Nonmetals
The correct answer is
C.
hope this help, and please mark brainlist ☻
<span>For addition and subtraction you round to decimal places.
Round the number so that it has the same number of decimal places as the number in your data that has the least number of decimal places.
9 cm + 2.8 cm = 11.8 cm
the 9 has no decimal places so
= 12 cm
(this is rounded to 0 decimal places.)
(It has 2 sig figs) </span>
Answer:
7/16
Explanation:
The general formula for the combustion of alkanes is;
CnH2n+2 + 3n+1/2 O2 -------> nCO2 + (n+1)H2O
So, we have;
CnHn + nO2 ------> 7CO2 + 8H2O
So there are 7 carbon atoms and 16 hydrogen atoms in heptane according to the law of conservation of mass.
Therefore, heptane is; C7H16
The ratio of carbon to hydrogen is now; 7/16