CHEMISTRY HIGH SCHOOL

What two things determine whether a molecule is polar?Check all that apply. A.The size of the atoms that make up the molecule B.Whether or not there are bonds of two atoms of unequal electronegativity C.Whether there is a double bond D.The shape of the molecule

Answers

Answer 1
Answer: its B and C 
if ur looking for 2 options 
Answer 2
Answer:

Answer:B & D

Explanation:

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The characteristic temperature at which a pure solid changes to a liquid is its ______ point.
A 12.5-g marble display 5.0 mL of water. What is its density?
Identify whether the following is an example of qualitative or quantitative data. the taste of an apple:
A solution of salt (molar mass 90 g mol-1) in water has a density of 1.29 g/mL. The concentration of the salt is 35% by mass.a. Calculate the molality of the solution.b. Calculate the molarity of the solution.c. Calculate the mole fraction of the salt in the solution.
During which change of state would the volume of a substance increase the most? 1.deposition 2.melting 3.vaporization 4.sublimation

Write a balanced equation for each of the following reactions:the reaction of solid lithium with nitrogen to form solid lithium nitride.
the reaction between aqueous solutions of cobalt(III) nitrate and sodium hydroxide to form aqueous sodium nitrate and solid cobalt(III) hydroxide.
the reaction between solid zinc and aqueous hydrochloric acid in a single replacement reaction.
classify the reactions in (a) and (b).

Answers

Synthesis Reaction

6Li(s) + N₂(g) ⇒ 2Li₃N(s)

Double Replacement Reaction

Co(NO₃)₃(aq) + 3NaOH(aq) ⇒ 3NaNO₃(aq) + Co(OH)₃(s)

Zn(s) + 2HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)

What is double replacement reaction?

  • A double-displacement reaction has the general formula AB + CD = AD + BC. Double-displacement reactions include the following examples: Ammonium Chloride, a salt, and sodium hydroxide, a base, combine to produce sodium chloride, hydrochloric acid, and water. In a double replacement process, the atoms of two compounds are switched, creating two new molecules.
  • Metals always replace metals, and nonmetals always replace nonmetals in single replacement processes.
  • Precipitates are frequently created by double replacement reactions when insoluble chemicals are created.
  • Checking to see if the cations exchanged anions with one another is the simplest technique to determine whether a reaction is a double displacement.
  • If the states of matter are mentioned, another indicator to look for is the production of a single solid product and watery reactants (since the reaction typically generates a precipitate)

To learn more about double replacement reaction, refer

brainly.com/question/23918356

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6Li(s) + N₂(g) ⇒ 2Li₃N(s) Synthesis Reaction

Co(NO₃)₃(aq) + 3NaOH(aq) ⇒ 3NaNO₃(aq) + Co(OH)₃(s) Double Replacement Reaction

Zn(s) + 2HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)

Copper has a density of 8.920 g/cm3. What mass of copper will occupy 45cm3? What volume of copper will have a mass of 1.0 kg?

Answers

density = mass/volume
so rearranged mass = volume x density
mass = 8.920 x 45 = 401.4g

rearrange   (there are 1000grams in 1kg)
volume = mass/density
volume = 1000/8.920
volume = 112.1076233cm3

Is sand biotic or abiotic

Answers

Non living things are abiotic so sand is abiotic

Jordan wonders why there is dew on the grass in the morning. He asks a few friends to see what they think. His friend Tasha says that there is dew on the grass because it always rains at night. Did Jordan find a scientific answer?

Answers

No because dew is water droplets that come from condensation rather than from rain coming at night
Jordan did not find a scientific answer if a warm clear day is followed by a cool clear evening Dew will likely form

A beaker with water and the surrounding air are all at 24°C. After ice cubes are placed in the water, heat is transferred from:(1) the ice cubes to the air
(2) the beaker to the air
(3) the water to the ice cubes
(4) the water to the beaker

Answers

The answer is (3) the water to ice cubes.

As the ice cubes should be at a temperature of about 0 degree ( freezing point) , at the same time the temperature of water is 24 degree. Thus, heat is transferred from water to ice cubes.
(3) the water to the ice cubes
  This is so because the ice cubes are colder compared to their surrounding objects.
They absorb the heat from the water, cooling it, therefore vanishing(melting).

The isotope atoms differ in ?

Answers

An isotope is formed basically when the amount of neutrons are different than the amount of protons in the nucleus. Therefore, we'd get a variation in the atomic mass (number of neutrons and protons). This is what makes isotopes different.

So, the answer would be: Isotope atoms differ in neutrons.
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