3 years ago

What is a Control trial

1 answer:

8 0

It is a trial aimed to reduce bias during an experiment. An example would be a sugar pill, something that has no real effect so that the results of the true trial can accurately be compared. Its like a control group.

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Which family is made up of all radioactive elements

VARVARA [1.3K]

Answer:

actinide family

Explanation:

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3 years ago

A 8L sample of gas at 250 K is cooled to 75 K. What is the volume of the gas after it is cooled?

Stells [14]

$by \: Charles'\: law: \: \\ \frac{v_{1}}{t_{1}} = \frac{v_{2}}{t_{2}} \\$

Where v is the volume(in L) and t is the temperature(in °K)

$\frac{8}{250} = \frac{v_{2}}{75} \\\\4/5 =v_2/3 \\\\\boxed{v_{2} = \frac{12}{5}}\\\\\\\huge{=2.5 l}$

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2 years ago

Atoms of two different elements react with each other when they have?

kipiarov [429]

All other elements react with other elements to form compounds. In the special case where the reaction produces fixed numbers of the same types of atoms in exactly the same configuration, we say the elements have formed a molecule.

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3 years ago

The Arrhenius theory explains how the concentration of H

koban [17]

Answer:true

Explanation:

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2 years ago

Would you expect the substance to float or sink in water if mass is 25g and volume is 7 cm

Sonbull [250]

Answer:

Sink

Explanation:

For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that $25/7 > 1$ , so the substance would sink.

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2 years ago