CHEMISTRY HIGH SCHOOL

If a solid, a liquid, and a gas of a substance are each in separate covered jars, then the amount of kinetic energy of the particles of the substances decreases from solid to liquid to gas.True
False

Answers

Answer 1
Answer:

Answer:

false

Explanation:

i had the same thing to do

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The molarity of an aqueous solution of NaCl is defined as the(1) grams of NaCl per liter of water
(2) grams of NaCl per liter of solution
(3) moles of NaCl per liter of water
(4) moles of NaCl per liter of solution

Answers

Answer:

The correct option is (4)

Explanation:

Molarity (M) is generally defined as the number of moles of a solute per liter of the solution.

The formula for molarity (from the definition above) is

M = number of moles (n) ÷ volume (in liters or dm³)

The unit for molarity is mol/L or mol/dm³

From the above, it can be deduced that the molarity of an aqueous solution of common salt (NaCl) is the number of moles of NaCl per liter of the salt solution.
Molarity = number of moles / volume in liters solution

Answer (4)

hope this helps!

Give two reasons why a gold ring is not made of 100% gold.

Answers

Gold is extremely malleable in its purest form, so a 24-carat (pure) gold ring would be very easy to get dented and squashed during the time that it is being worn.
It is also extremely expensive to process gold to its purest form, so pure gold jewelry would be ridiculously expensive, to the point of no demand.
Hope that helped =)
1. Gold is soft like lead. 

2. Pure gold isn't durable, and wouldn't last, nor would you be able to keep it on your finger since it's so soft. If you're gonna wear a ring for a life-time, it has to have durability.

Consider the following reversible, exothermic chemical reaction: 2C2H2(g) + 5O2(g) ↔4CO2(g) + 2H2O(g) All BUT one of the conditions will cause equilibrium to shift right and produce more of the products. Which change will cause the reaction to shift to the left?
A) adding oxygen
B) adding CO2
C) increasing the pressure
D) decreasing the temperature

Answers

Answer : The correct option is, (B) adding CO_2

Explanation :

Le-Chatelier's principle : This principle states that if any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

Option A : adding oxygen

If the concentration of O_2 is increased on reactant side then the equilibrium will shift in the direction where decrease of concentration of O_2 takes place. Therefore, the equilibrium will shift in the right direction.

Option B : adding CO_2

If the concentration of CO_2 is increased on product side then the equilibrium will shift in the direction where decrease of concentration of CO_2 takes place. Therefore, the equilibrium will shift in the left direction.

Option C : increasing the pressure

If the pressure of the container is increased then the equilibrium will shift in the direction where the less number of moles of gas molecules is taking place. As the number of moles of gas molecules is greater at the product reactant side and less at product side. So, the equilibrium will shift in the right direction.

Option D : decreasing the temperature

As the given reaction is an exothermic reaction in which the heat is released during a chemical reaction. That means the temperature is decreased on the reactant side. If the temperature is decreased in the equilibrium then the equilibrium will shift in the direction where, temperature is getting increased. Thus, the reaction will shift to the right direction i.e, towards the product.
Adding CO2 increases Q and makes Q > K (K being the equilibrium constant for this reaction).  As a result, the reaction will favor reactants until Q=K, so adding CO2 causes the reaction to proceed to the left.  B is the correct answer.

Beth has a one-day-old baby daughter. When Beth puts her finger in the baby’s hand, the baby grasps her finger. Which statement best describes why the baby grasps Beth’s finger?A.) The baby’s reflex to grab is an innate behavior.
B.) The baby’s visual memory recognizes Beth’s finger.
C.) The baby is a day old and has learned to reach for Beth.
D.) The baby’s homeostatic response is to touch objects that are warm

Answers

The statement which statement best describes why the baby grasps Beth’s finger is that it is a reflex to grab is an innate behavior.

What is reflex?

In biology, a reflex, or reflex action, is an involuntary, unplanned sequence or action and nearly instantaneous response to a stimulus.

The simplest reflex is initiated by a stimulus, which activates an afferent nerve. The signal is then passed to a response neuron, which generates a response.

Reflexes are found with varying levels of complexity in organisms with a nervous system. A reflex occurs via neural pathways in the nervous system called reflex arcs. A stimulus initiates a neural signal, which is carried to a synapse. The signal is then transferred across the synapse to a motor neuron, which evokes a target response. These neural signals do not always travel to the brain,so many reflexes are an automatic response to a stimulus that does not receive or need conscious thought.

Learn more about reflex,here:

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Answer:

The baby`s reflex to grab is an innate behavior.

It`s not B because if the baby is 1 day old it`s not going to 'remember'.

It`s not C because it hasn`t really 'learned' anything.

It`s not D because babies can`t sense heat like a snake or something. -_-

Hope that helps

I also love the pfp

The latent heat of vaporization of ethanol is 200 calories/gram. This means that _____. about 200 calories of heat must be added to 1 gram of ethanol to change its temperature about 200 calories of heat must be added to 1 gram of ethanol to convert it from a solid to a liquid about 200 calories of heat must be added to 1 gram of ethanol to convert it from a liquid to a gas

Answers

Heat of vaporization refers to the amount of energy required to vaporize some amount of a substance depending on the units.  Since the units in this case is calories/gram, 200 calories are required to vaporize 1 gram of ethanol.  This means that it takes 200 calories to convert 1 gram of ethanol from a liquid to a gas.

I hope this helps.  Let me know if anything is unclear.

Answer:

about 200 calories of heat must be added to 1 gram of ethanol to convert it from a liquid to a gas

Explanation:

How would one convert 36 yd to centimeters 2.54 cm = 1 in)?​

Answers

D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.

What are centimetres?

A metric unit of length, equal to one-hundredth of a metre.

To convert a yard measurement to a centimetre measurement, multiply the length by the conversion ratio. The length in centimeters is equal to the yards multiplied by 91.44.

D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.

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Answer:

D

Explanation:

A P E X
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