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anygoal [31]
4 years ago
7

Which statement is a testable hypothesis?

Chemistry
2 answers:
Ganezh [65]4 years ago
8 0

Answer:

[C] If people brush their teeth twice a day, then they will get fewer cavities.

Explanation:

C is the only correct option because the hypothesis is not an opinion (unlike the rest of the options), and the hypothesis is able to be tested, and accurate data is able to be collected.

Marta_Voda [28]4 years ago
3 0
It is C that is the most testable hypotheses
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How much heat is needed to raise a 0.30 g piece of aluminum from 30.C to 150C? The specific heat of aluminum 0.900j/gC
OLEGan [10]

Answer:

hi

Explanation:

8 0
3 years ago
Consider the following equation for the combustion of acetone (C3H6O), the main ingredient in nail polish remover.
solong [7]

Answer:

a) 4869 kj will be released

b) 43.86 g of octane

Explanation:

The heat of combustion is the amount of heat released when one mole of a substance reacts with enough oxygen

since the heat of combustion is per mol of combustible substancewjat we are required to do in this problem is calculate number moles in the reactions although in a different manner

a) MW C3H6O = 158 g/ mol

mol C3H6O = 158 g × 1 mol/ 58.08 g

= 2.72 - 1790 kj / mol ×2.72 mol = 4869 kj

b) Here we are asked the mass of octane to produce 1950 kj of heat knowing that per mole of octane we get 5074.1 kj then

1 mol / 5074.1kj × 1950 kj= 0.384 mol

mass C8H18 = 0.384 mol × 114.23 g/ mol = 43.86 g

4 0
3 years ago
Read 2 more answers
A 100 kg tree gets struck by lightning and is burned completely to ash. A scientist gathers up all the ash and weighs it to find
Oksi-84 [34.3K]

Answer:

Evaporated via combustion.

Explanation:

The loss on ignition (LOI) and Ash content are inorganic analytical techniques used to determine the percentage by mass of hydrocarbon in compounds. This process allows volatile matter and possibly impurities found in a material to evaporate, leaving behind the true chemical constituents of the material.

The 10kg lost could be moisture content of the tree, or other volatile matter which has escaped on combustion of the tree.

6 0
3 years ago
Which is a restriction on both workers and producers that keeps the labor market from being a completely free market?
NemiM [27]

Answer:

Balanced chemical equations only show formulae, not names. A balancing number, written in normal script, multiplies all the atoms in the substance next to it.

6 0
3 years ago
How much mass does 4.53 x 10^22 have
snow_tiger [21]
<span>4.53<span>x^<span>10^22</span></span></span>Simplifies to:<span>4.53x</span><span>=<span>4.53*x</span></span><span>=<span>4.53<span>x</span></span></span>
8 0
3 years ago
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