CHEMISTRY MIDDLE SCHOOL

Which of the following statements is a valid hypothesis?The atmosphere contains more nitrogen than oxygen.
Alien spaceships cause crop circles to form.
Why are most plants green in color?
A frog jumps more often when it is feeling happy.

Answers

Answer 1
Answer: the on about the atmosphere
Answer 2
Answer:

Answer:

the answer is A. the atmosphere contains more nitrogen the oxygen

Explanation:

A.The atmosphere contains more nitrogen than oxygen.

B.Alien spaceships cause crop circles to form.

C.Why are most plants green in color?

D.A frog jumps more often when it is feeling happy.

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Why only electrons stick to oil drop in millikan's experiment however protons are also present there?why millikan only used oil ?and what is the ability in oil drop that it attracts electron towards itself?

Answers

Explanation:

probably because, X rays are used to ionise the gas molecules, which is loss of electrons, these electrons are absorbed by oil drops

Is cell division a form of reproduction? Explain. Why do you think this?

Answers

Cell division is the means of reproduction in organisms which reproduce asexually

imagine a drop of water hanging from your finger. how is this similar to the water staying together after the balloon is popped

Answers

I believe it has to do with something in the water like atoms that holds it together, I'm not sure I forgot

Final answer:

The concept of surface tension, enforced by cohesive forces between water molecules, explains why a water droplet hangs from your finger and why water stays together momentarily after a balloon is popped.

Explanation:

The similarity between a drop of water hanging from your finger and the water staying together after a balloon is popped is surface tension. Surface tension is a physical property of liquids which makes them act like they are covered with a stretched elastic sheet. This property is caused by the cohesive forces between liquid molecules.

When a water droplet hangs from your finger, the cohesive forces of the water molecules hold them together in a droplet shape due to surface tension. Similarly, when a water-filled balloon is popped, the water doesn't immediately disperse into a fine spray but rather holds together momentarily. This is also due to cohesive forces and surface tension. Each water molecule is pulled equally in every direction by its neighboring water molecules, resulting in a net force of zero and maintaining its shape momentarily even without the balloon.

Learn more about Surface Tension here:

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The periodic table is organized left to right by __________.Metals, nonmetals, metalloids

Metals, metalloids, nonmetals

Metalloids, nonmetals, metals

Nonmetals, metalloids, metals

Answers

Answer:

Metals, metalloids, non-metals

Explanation:

:)

The answer will be B. Metals, metaloides, nonmetals

Consider the equation: 2NO2(g) N2O4(g). Using ONLY the information given by the equation which of the following changes would increase the molar concentration at equilibrium of the product N2O4(g)?increase the pressure
increase the temperature
decrease the concentration of NO2(g)
decrease the temperature
decrease the pressure

Answers

I believe the correct answer is the first option. To increase the molar concentration of the product N2O4, you should increase the pressure of the system. You cannot determine the effect of changing the temperature since we cannot tell whether it is an endothermic or an exothermic reaction. Also, decreasing the number of NO2 would not increase the product rather it would shift the equilibrium to the left forming more reactants. The only parameter we can change would be the pressure. And, since NO2 takes up more space than the product increasing the pressure would allow the reactant to collide more forming the product.

The answers A. increase the pressure

Explanation:

155.4 grams of carbon tetrachloride to atoms

Answers

30.41 × 10²³ atoms

Explanation:

First we calculate the number of moles of carbon tetrachloride (CCl₄):

number of moles = mass / molar weight

number of moles of CCl₄ = 155.4 / 153.8 = 1.01 moles

Now to find the number of atoms in 155.4 grams of carbon tetrachloride we use Avogadro's number:

if in         1 mole of CCl₄ there are 5 × 6.022 × 10²³ atoms

then in   1.01 moles of CCl₄ there are X atoms

X = (1.01 × 5 × 6.022 × 10²³) / 1

X = 30.41 × 10²³ atoms

Learn more about:

Avogadro's number

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