CHEMISTRY MIDDLE SCHOOL

Scientists write down every detail of an experiment. A. so they can do the experiment many times and compare the results.
B. because they don't take any pictures.
C. because they always need to change their hypothesis.
D. so they can leave the experiment alone to run itself.

Answers

Answer 1
Answer:  A good procedure is so detailed and complete that it lets someone else duplicate your experiment exactly! Repeating a science experiment is an important step to verify that your results are consistent and not just an accident.

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HIGH SCHOOL

For which of the following processes would there decrease in entropy? A. melting ice B. separation of a compound C. boiling water D. freezing water

Answers

For the answer to the question above, entropy is basically a measure of how organized or disorganized energy is in a system of atoms/molecules.
Melting ice, decomposing a compound and boiling water all cause a greater dispersal of energy, and so for them, entropy is increasing. 
I hope this helps
The answer is D. freezing water.
HIGH SCHOOL

The atomic mass of an atom do not contain electrons because...?

Answers

Electrons are usually depicted in drawings as much smaller than protons or neutrons because their mass is so much smaller. In fact, electron mass is so small that it isnot counted in an atom's mass.
hope this helps 
HIGH SCHOOL

How did mendel use his training in mathematics to aid his experiments in life science?

Answers

Mendel use his training in mathematics to aid his experiments in life science by using it for the offspring sexual reproduction. He mainly studied pea plants because they had distinguished characteristics and they were quick to grow. Mendel would create hybrids from the plants. 

Answer:

He was the first scientist to use probability to explain heredity.

Explanation:

COLLEGE

The mass of one mole of carbon dioxide is _ g. A) 28.01
B) 44.01
C) 384.4
D) 32.00
E) none of the above

Answers

Answer:

B

Explanation:

mass of one mole of carbon dioxide is 44.01g

HIGH SCHOOL

The mass of each WtWt isotope is measured relative to C−12C−12 and tabulated below. Use the mass of C−12C−12 to convert each of the masses to amuamu and calculate the atomic mass of WtWt.?

Answers

The question is incomplete , the complete question is;

The mass of each Wt isotope is measured relative to C-12 and tabulated below. Use the mass of C-12 to convert each of the masses to amu and calculate the atomic mass of Wt.

Wt-296  =  24.6622

Answer:

The atomic mass of Wt-296 is 195.9464 amu.

Explanation:

1 amu is defined as 1 by twelfth of the carbon-12 mass.

Mass of an isotope Wt-296 = 24.6622

Mass of an isotope Wt-296 in amu = M

The atomic mass of Wt-296 is 195.9464 amu.

HIGH SCHOOL

Which of the following statements about protons are true? SELECT ALL THAT APPLY

1 Protons have the same magnitude of charge as electrons but are opposite in sign.
2Most atoms have more protons than electrons.
3 Protons have twice the mass of neutrons.
4Protons have a charge of 1+.

Answers

4 protons , 3 protons , 2  protons
MIDDLE SCHOOL

how many moles of an ideal gas would occupy a 25.0 liter container when the temperature is 295 K and the pressure is 0.850 atm?

Answers

Answer:

Required number of moles of ideal gas is 0.877 moles.

Explanation:

Pressure (P) = 0.850 atm

Temperature (T) = 295 K

Volume (V) = 25 ltr

Universal gas constant (R) = 0.0821

no of moles (n) = ?

we have the ideal gas equation as:

                           PV= nRT

                or, 0.850× 25 = n × 0.0821 × 295

                or, n = 0.877 moles

Hence the required number of moles of an ideal gas is 0.877 moles.

HIGH SCHOOL

What type of mixture scatters light and cannot be filtered

Answers

Colloid is a type of mixture that scatters light and cannot be filtered. Colloids are heterogeneous mixtures with a particle size between that of the solutions and that of the suspensions: the size of the particles of a colloid is bigger than the molecules or ions of a solution and smaller than the particles of a suspension. Due to the small size of the particles in the colloids, the diluted colloids seem homogeneous, but those particles are big enough to produce the Tyndall effect, which is the dispersion of the light. Solutions do not show Tyndall effect.
COLLEGE

Calculate the vapor pressure (in torr) at 298 k in a solution prepared by dissolving 15.3 g of the non-volatile non-electrolye urea {co(nh2)2} in 107 g of water. the vapor pressure of water at 298 k is 23.76 torr. enter your answer to 2 decimal places

Answers

In colligative properties like vapor pressure, boiling point, freezing point and osmotic pressure, only the quantity of solute may affect their values. Their identity does not affect these properties. When solute is added to a solution, the vapor pressure decreases, that's why it is called vapor pressure lowering. The equation is

ΔP = xP°, where ΔP is the difference of the vapor pressure of the solution and of the solvent. P° is the vapor pressure of the pure solvent while x is the mole fraction of solute. The molar mass of urea is 60.06 g/mol while that of the water is 18 g/mol.

x =mol urea/total mol = (15.3/60.06)/[(15.3/60.06)+(107/18)]
x = 0.0411

Then,
ΔP = xP°=0.0411*23.76 = 0.976 torr

Therefore, the vapor pressure of the solution is 23.76 - 0.976 = 22.78 Torr.
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