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2 years ago

7. What must you do before you make a hypothesis?

Chemistry

1 answer:

almond37 [142]2 years ago

6 0

Answer:

Ask a question?

Explanation:

look at the scientific method uwu

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Which word part means cold? crylo chem/ cis/o cyan/

snow_lady [41]

Crylo i think is the correct answer

8 0

3 years ago

How do hydrogen ions (h+) and chloride ions (cl–) get into the lumen of the stomach?

user100 [1]

In the stomach cell, the enzyme carbonic anhydrase converts one molecule of carbon dioxide and one molecule of water indirectly into a bicarbonate ion (HCO3-) and a hydrogen ion (H+). In the stomach ion exchange is used to move H+ ions out the cells and into the lumen of the stomach

8 0

2 years ago

The common laboratory solvent ethanol is often used to purify substances dissolved in it. The vapor pressure of ethanol , CH3CH2

OverLord2011 [107]

Answer:

Molar mass of solute is 183.4g/mol

Explanation:

Using Raoult's law it is possible to find moles of solute, thus:

$P_{solution} = X_{solvent}P_{solvent}^0$

Where pressure of solution is 53.15 mmHg, pressure of pure solvent is 54.68 mmHg and mole fraction is:

53.15 mmHg = X 54.68 mmHg

0.9720 = X

Mole fraction of solvent is defined as moles of solvent / total moles.

Moles of solvent are:

286.8g × (1mol / 46.07g) = 6.225 moles of ethanol.

That is:

$0.9720 = \frac{6.225mol}{Y+6.225mol}$

Where Y are moles of solute.

6.051 + 0.9720Y = 6.225

0.9720Y = 0.174

Y = 0.179 moles of solute

As mass of solute dissolved was 32.83g. Molar mass of solute is:

32.83g / 0.179mol = 183.4g/mol

4 0

3 years ago

Characteristic of meteor

Sati [7]

Explanation:

Many meteorites have iron or nickel in them, so they are heavier (and denser) than Earth rocks. Some meteorites have pits (regmaglypts) on the outside, which look like deep thumbprints. Meteorites are not bubbly, and do not have holes. Meteorite are usually not round.

8 0

1 year ago

(a) In a gaseous sample of oxygen atoms and diatomic oxygen in equilibrium at 298K andunder a pressure of 1atm, what fraction of

ZanzabumX [31]

Answer:

Explanation:see below as shown from pics

7 0

2 years ago