1.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element that reacts with water to produce a lilac flame
2.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element used as an inert atmosphere
3.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element that has a valency of 3
4.Write a balanced chemical equation for the reaction between potassium and water. (Non-anonymous question). .
(1 Point)
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5.For each of the following, give the name of an element from Period 4 (potassium to krypton), which matches the description.
Elements may be used once, more than once or not all.. Single line text.
(1 Point)
an element with a fixed valency of 2 that not is not in group 2
Help
Waves produced a diffraction pattern.
Results supported the wave theory of light.
Answer:
2.75 g/cm³
Explanation:
volume= 4³= 64
mass = 176g
now,
density= mass ÷ volume=2.75 g/cm³
Answer:
b)4.46 L/hr
Explanation:
To solve this question we need to convert the mL to liters (Using the conversion of 1000mL = 1L) and convert the time from seconds to hours (3600s = 1hr)
<em>mL to L:</em>
1.24mL/s * (1L / 1000mL) = 0.00124L/s
<em>seconds to hours:</em>
0.00124L/s * (3600s / 1hr) = 4.46L/hr
Right answer is:
<h3>b)4.46 L/hr
</h3>
The substances that lower the amount of energy needed to star a chemical reaction are called catalysts.
The catalyst speeds up a reaction by creating an intermediate within the reaction. By the end of the reaction, the catalyst is regenerated and ready to speed up the next reaction.
One of the most famous catalysts are enzymes, proteins that are necessary for many chemical reaction in biological systems. Some of the catalysts can be much simpler than the proteins, and often are simple salts or metals.
