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kenny6666 [7]
3 years ago
11

What is the next step if the data from an investigation do not support the original hypothesis?

Chemistry
1 answer:
IceJOKER [234]3 years ago
5 0
Change one of the variables and try again
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Hard water stains in sinks and showers can be caused by a buildup of solid calcium carbonate. These stains can be removed by bat
LiRa [457]

Answer:

CaCO3 + 2HCl ---> CaCl2 + H2O + CO2

Explanation:

The reaction between solid calcium carbonate and a mineral acid such as aqueous HCl is a neutralization reaction and occurs with the evolution of CO2 gas.

The balanced equation is given below

CaCO3 + 2HCl ---> CaCl2 + H20 + CO2

The product CaCl2 is water soluble which accounts for why the stain is removed, while CO2 gas escapes away from the reaction surface.

8 0
2 years ago
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Circle the letter of each expression that has four significant figures. <br> a. 1.25 104 b. 12.51
DiKsa [7]

B is the answer

1 2 5 1

4 0
2 years ago
1 Condensation
larisa86 [58]

Answer:

Explanation:

A ) Solar Radiation

B ) Evaporation

C ) Transpiration

D ) Condensation

E ) Precipitation

F ) Run Off

G ) Infiltration

H ) Groundwater .

3 0
2 years ago
Which of the following measurements is expressed to three significant figures?
tiny-mole [99]
D. is the answer
hope i could help
8 0
3 years ago
What is the empirical formula of a compound that contains 32.39 percent sodium, 22.53 percent sulfur, and 45.07 percent oxygen?
djverab [1.8K]
To get the empirical formula of this compound, we take a basis of 100 grams which means each percentage is equivalent to 1 gram. Hence there is 32.39 grams sodium, 22. 53 grams sulfur and 45.07 grams oxygen. We convert each mass to their moles by dividing by their respective molar mass. Na: 1.408, S:0.704 and O:2.82. divide each with the lowest: Na: 2: S: 1 and O:4. Hence the formula is Na2SO4.
5 0
2 years ago
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