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2 years ago

Why do we get hot when we exercise?

2 answers:

3 0

It’s your body’s way of regulating your core temperature, preventing you from overheating. Your muscles heat up as they expend energy during exertion. When this happens, your skin begins to sweat, causing your body to cool down. The spike in your body heat also alerts your brain to ensure your body remains at the normal core temperature of 98.6 degrees Fahrenheit (or 37 degrees Celsius).

zalisa [80]2 years ago

3 0

While exercising the body begins to warm up. When the body begins to warm up our muscles convert stored energy into heat energy, making our bodies become warmer. As the body heats up further the brains thermostat ensures that you remain close to the normal core temperature.

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If you have 85g of sulfur dioxide at STP, how many moles do you have?

Step2247 [10]

Answer: 1.32

Explanation:

Given

85 gm of sulfur dioxide is present at STP

The molar mass of sulfur dioxide is $32+2\times 16=64\ g/mol$

The number of moles of sulfur dioxide is

$\Rightarrow n=\dfrac{85}{64}\\\\\Rightarrow n=1.32\ \text{mol}$

3 0

2 years ago

What are the three physical properties of gases

daser333 [38]

They are described through the use of four physical properties or macroscopic characteristics: pressure, volume, number of particles (chemists group them by moles) and temperature.

5 0

2 years ago

Read 2 more answers

Zachary adds 9.7 g to 1.114 g.<br> How many significant figures should his answer have?

makvit [3.9K]

Always use least amount of sig figs possible. So this 9.7 would be (answer): 2 sig figs

5 0

2 years ago

A reaction is non-spontaneous at any temperature when

slavikrds [6]

Answer:

A reaction is non-spontaneous at any temperature when the Gibbs free energy > 0.

Explanation:

There is a state function, that determines if a reaction is sponaneous or non spontaneous:

ΔG = Gibbs free energy

A reaction is non spontaneous when it does require energy to produce that reaction. It will be spontaneous, when the reaction does not require energy to be occured.

The formula is: ΔG = ΔH - T.ΔS

ΔH → Enthalpy → Energy gained or realeased as heat.

ΔH < 0 → <em>Exothermic reaction. Spontaneity is favored </em>

T → Temperature

ΔS → Entropy → Degree of disorder of a system.

When the system has a considered disorder ΔS > 0, disorder increases.

When the system is more ordered, ΔS < 0, disorder decreases.

The reaction will be non spontaneous if, the enthalpy is positive (endothermic reaction) and the ΔS < 0 (disorder decreases). It will not occur if we do not give energy.

ΔG < 0 → Spontaneous reaction

ΔG > 0 → Non spontaneous reaction

ΔG = 0 → System in equilibrium

8 0

3 years ago

Provide a brief theory which explains the application of polymerization reactions to everyday life.

nikdorinn [45]

Explanation:

Polymers are extensively used innovative materials, which are originated nearly in each material used in our daily life. Polymers, a big class of resources, comprise of many small particles called monomers that are related composed to form long shackles and are used in a lot of products and goods that we use in daily life. The polymer named Polyethylene is used in plastic bags and film wraps. Polyvinyl Chloride ( PVC) is castoff in siding, pipes, flooring determinations. The synthetic polymer Polystyrene is used in cabinets, petri dishes, CD cases, plastic cutlery and in packaging. Polyvinyl acetate is used in adhesives and latex paints.

3 0

3 years ago