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MatroZZZ [7]
3 years ago
15

Help help help help help​

Chemistry
1 answer:
Rina8888 [55]3 years ago
5 0

Answer:

Temporary hardness is a type of water hardness caused by the presence of dissolved bicarbonate minerals (calcium bicarbonate and magnesium bicarbonate). ... However, unlike the permanent hardness caused by sulfate and chloride compounds, this "temporary" hardness can be reduced by boiling the water.

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20<br> How do you solve this ?
Kaylis [27]

Answer:

eight oxygen atoms

Explanation:

This formula shows that in one mole of this compound, there are 3 moles of Ca atoms that combine with 2 moles of the PO4(phosphate) groups, which gives a total of 2 moles of P atoms and 8 moles of 0 atoms.

5 0
2 years ago
Scientists' belief that an atom is a solid sphere, is good enough to explain; PLZ I HAVE LESS TIME!!!!
Natasha2012 [34]

Answer:

Its quite vague, instead you could say an atom is the smallest building block which further consists of subatomic particles like protons, neutrons and electrons :)

Hope thi helps :) and I'd appreciate if you'd mark brainliest because ive been stuck on the same rank for quite a long time :(

7 0
2 years ago
Why are models used to represent Atoms
Keith_Richards [23]

Answer:

C

Explanation:

5 0
2 years ago
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What kinds of compounds have the greatest difference between their melting point and their boiling point?
seropon [69]
Alloys alloys alloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloysalloys alloys
3 0
3 years ago
Hydrogen is used as a rocket fuel because it is very light and reacts explosively and completely with oxygen. For the combustion
777dan777 [17]

Answer:

1. K<10−3

Explanation:

Equilibrium Constant is an expression which involves the concentration of the product divided by the concentration of the reactant molecules.

However the concentration of the pure liquid and pure solid is regarded as 1.

Equilibrium expression for the equation 2H2(g)+O2(g)⇌2H2O(g)

Equilibrium Constant = [H2O]^2/[H2]^2 x [O2]

Since H2O is a pure liquid, its concentration = 1

There fore;

Equilibrium Constant = 1/[H2]^2 x [O2]

This shows that the Equilibrium Constant of the equation will be less than 1 and greater than 0.

7 0
3 years ago
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