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3 years ago

PLEASE HELP ME ILL GIVE BRAINLIEST IF YOU EXPLAIN UR ANSWER

Chemistry

2 answers:

ziro4ka [17]3 years ago

7 0

Answer:

they cant relxax or the ball woud not be in your have it would fall bec there is no stranth for your musseles

Explanation:

Marina CMI [18]3 years ago

5 0

The contraction of the triceps muscle causes the arm to flex. The contraction of the triceps muscle causes the arm to extend. When added to the force of the biceps contracting it provides extra force to the ball.

The answer is A

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As Nicole walks to her dorm room after a study group in the library she sees a backpack being stolen. The neurotransmitter activ

34kurt

As Nicole walks to her dorm room after a study group in the library she sees a backpack being stolen. The neurotransmitter activated during this emergency situation is a. norepinephrine.

High levels of norepinephrine can also lead to headaches, high blood sugar, and sleep disturbances. Too much norepinephrine also causes anxiety, high blood pressure and heart rate, and organ stress. Drug withdrawal, chronic renal disease, and mental illnesses like PTSD can also result in high norepinephrine levels. Neurons discharge neurotransmitter, which are chemical messengers, into the synapse through synaptic vesicles. Some neurotransmitter work by increasing the neuron's negative electrical charge, which makes it less likely to activate. This is a deterrent effect. Serotonin is an example of this.

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2 years ago

5) How many Kilograms are in 12 L of Chlorine Gas?

melamori03 [73]

Answer: 0.03798 kilograms

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar Volume}}=\frac{12L}{22.4L}=0.535moles$

1 mole of chlorine gas $(Cl_2)$ weighs = 71 g

Thus 0.535 moles of chlorine gas $(Cl_2)$ will weigh = $\frac{71}{1}\times 0.535=37.98g=0.03798kg$ (1kg=1000g)

Thus there are 0.03798 kilograms in 12 L of chlorine gas.

3 0

3 years ago

A student has a solution of sodium nitrate and believes it is saturated. Which statement provides the best evidence that the sol

zheka24 [161]

It is easiest to tell if a solution is saturated if there is residue on the bottom. If it crystallized, the solution is saturated. If it is a supersaturated solution, there will not be crystallization unless more of the solute is added, at which point all of it will crystallize.

6 0

3 years ago

Consider this reaction: 6 CO2 + 6 H2O + light equation C6H12O6 + 6 O2 If there were 2.38 x 102 g of H2O, 18.6 moles of CO2, and

alisha [4.7K]

H₂O would be the limiting reactant.

Balanced chemical equation:

6CO₂ + 6H₂O + light equation → C₆H₁₂O₆ + 6O₂

The amount of product that can be created is constrained by the reactant that is consumed first in a chemical reaction, commonly referred to as the limiting reactant (or limiting reagent).

Given

No. of moles of CO₂ = 18.6

Mass of H₂O = 2.38 × 10² g = 238g

No. of moles of H₂O = Given mass/ Molar mass

= 238 / 18 = 13.22 moles

Moles of H₂O = 13.22

According to the balanced chemical equation

6 moles of CO₂ react with 6 moles of H₂O

So the reactant that has less number of moles will be consumed first.

As the No. of moles of H₂O < No. of moles of CO₂

So, H₂O is the limiting reactant with 13.22 moles.

Hence, H₂O would be the limiting reactant.

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7 0

2 years ago

If an ice cube melts at 0ºC but water also freezes at 0ºC, what is the difference between melting and freezing in terms of…….

devlian [24]

Answer:

8. When melting the energy of the ice cubes increases and when frezzing the energy of the water decreases.

9. When melting the otion of the particles speed up, when freezing the motion of the particles slow down.

Explanation:

8. The energy involved in the phase changes

When an ice cube melts at 0ºC it must absorb or gain energy from the surroundings. This is an endothermic process, because the energy of the liquid water shall be higher than the energy of the starting ice cubes.

In conclusion, when melting the energy of the water increases.

On the other hand, when the liquid water freezes, also at 0ºC, the flow of heat energy is from the liquid water to the surroundings. This is an exothermic process because the water releases heat. At the end, the energy of the frozen water will be lower than the energy of the liquid water.

In conclusion, when freezing the enery of the water decreases.

9. The motion of the particles of the substances during the phase changes

The particles of liquid substances are in constant motion, which is what allows them to flow. This is because the particles (molecules or atoms) are relatively distant from each other, with relatively low intermolecular forces. Thus, they can slide on each other.

On the other hand, the solid substances have the particles in fixed position in structures called crystals. The particles vibrate but do not translation motion.

In conclusion, the difference is that the motion of the particles during melting increases and the motion of th particles during freezing decreases.

4 0

3 years ago