Answer: The missing coefficient is 2.
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
As in the products, there are 2 atoms of sodium, thus there will be 2 atoms of of sodium in the reactant as well. This will balance the number of hydrogen and oxygen atoms as well.
Thus the missing coefficient is 2.
Your answer is <span>D) The angle of light from the sun as it reflects off the moon and viewed from the Earth's surface because of the way the sun hits the moon one side has to light the other doesn't and when the moon rotates the sun hits another part of the moon.
If you need more help I would be glad to help!
</span>*~"AB84"~*
No, the distance from the first stop to the schools and the average speed is required.
Answer:
3. A catalyst can convert an endothermic reaction into an exothermic reaction.
Explanation:
<em>What is NOT true for a catalyst? </em>
<em>1. A catalyst increases the rate of a chemical reaction by decreasing activation energy.</em> TRUE. A positive catalyst increases the reaction rate by decreasing the activation energy.
<em>2. A catalyst is not consumed in chemical reactions.</em> TRUE. A catalyst is recovered unaltered at the end of the reaction.
<em>3. A catalyst can convert an endothermic reaction into an exothermic reaction.</em> FALSE. A catalyst cannot modify the enthalpy of a reaction.
<em>4. A catalyst may be used in the solid, liquid or gaseous phase.</em> TRUE. If the catalyst is in the same phase as the reaction, the catalysis is homogeneous. Else, the catalysis is heterogeneous.
