Answer: Hmmmmm that's crazy....
There are a couple of equations one could use for this type of problem, but I find the following to be the easiest to use and to understand.
Fraction remaining (FR) = 0.5n
n = number of half lives that have elapsed
In this problem, we need to find n and are given the FR, which is 1.56% or 0.0156 (as a fraction).
0.0156 = 0.5n
log 0.0156 = n log 0.5
-1.81 = -0.301 n
n = 6.0 half lives have elapsed
Explanation:
Just wanted to help. Hopefully it's correct wouldn't want to waster your time ;)
The standard enthalpy of reaction should be negative.
<h3>What is enthalpy?</h3>
A thermodynamic quantity equivalent to the total heat content of a system. It is equal to the internal energy of the system plus the product of pressure and volume.
Inside the heat pack are two chemicals that get mixed when you smush them together. As they mix, some weak bonds are broken, which takes a little bit of energy. But new, stronger bonds form which release energy. Releasing that energy causes the surroundings to heat up.
Hence, option B is correct.
Learn more about enthalpy here:
brainly.com/question/13775366
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Answer:
a: iron is a substance
Explanation:
because its hard and brittle and classified as a metal
The question is another language. Translation in English language is as following:
What are the common sensors that can be used to identify metal, gas or liquid?
Answer:
<u>Common sensors that can be used to identify metal, gas or liquid are as following:</u>
- Inductive Proximity Sensor: Inductive proximity sensors are able to detect metals only. It generates output signal or electrical signal when any metal object come nearby its sensing area.
- Handheld flammable gas detectors: they are commonly used to detect gas leakage such as natural gas lines, butane tanks, or any other combustible gas.
- Optical level sensors: this sensor is used to detect liquids including the interface between two immiscible liquids and the occurrence of sediments.