Answer:
C
Explanation:
u can't touch a chemical with bare skin
Answer:
1. filtration and evaporation
2. i) water is added to the sand and salt mixture
ii) then the mixture is filtrated and so the sand and the salt water was seperated
iii) the salt water is heated with the help of burner until the water gets evaporated
iv) after the water gets evaporated, the salt is remained in the container
3. observation:
- on adding water to the mixture, the salt is completely dissolved in the water
- when filtrated the sand is seperated from the salt water
- now the salt water when heated with the burner until the evaporation, the water is evaporated
- the salt is precipitated and remained in the container
4. cautions:
- while using the burner, we should be cautious with fire
- the container that is heated should be holded with the help of a cloth to avoid heat
Hydrogen sulfide = hidrogen + sulfur
6.500 g
a) 0.384 g + x
=> 6.500 = 0.384 + x => x = 6.500 - 0.384 = 6.116 g
Answer: 6.116 g of sulfur must be obtained
b) this experiment demonstrate the conservation of mass.
c) Dalton's atomic model states that the atoms cannot be created, split or be destroyed, and so in a chemical reaction the atoms rearrange but the number of each type of atoms remain constant, so the mass of each type of atoms and the total mass remain constant.
The species which gives OH⁻ ion is known as Arrhenius base.
<h3>What are
Arrhenius bases?</h3>
Arrhenius bases are those species which are giving hydroxide ion (OH⁻) in an aqueous solution.
Properties of Arrhenius bases are:
- They are bitter in taste.
- Converts red litmus paper to blue color.
- Have pH value in the range of 7.1 to 14.
Examples of Arrhenius bases are sodium hydroxide (NaOH), potassium hydroxide (KOH), etc.
Hence, Arrhenius bases gives OH⁻ in an aqueous solution and NaOH is an example of this.
To know more about Arrhenius bases, visit the below link:
brainly.com/question/1049247
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Answer:
C: Good conductors of electricity
Explanation:
By definition, Metals have metallic bonds and thus they are good conductors of electricity due to the fact that their electrons in the electron sea are usually free to flow and carry electric current. Thus, the correct answer is option C.
