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2 years ago

What new information can you add to your definition of physical change ?

Chemistry

1 answer:

Mamont248 [21]2 years ago

7 0

Its reversible, soluble, mass, density, color, boiling point, temperature, and volume.

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Saliva, produced by glands in the mouth, plays an important role in the digestion of food. Saliva contains a chemical, called am

Cerrena [4.2K]

Answer:

The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.

Explanation:

4 0

2 years ago

1 pts.what is the charge on the hydrogen end of a water molecule?

Savatey [412]

Positive

And Negative for oxygen.

4 0

3 years ago

What is evidence when mixing sugar into water

Tems11 [23]

That water is a universal solvent and that sugar is soluble?

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3 years ago

A runner runs 4339 ft in 7.45 minutes. What is the runner's average speed in miles per hou 6.62 mi/hr O 0.110 mi/hr 6.618 mi/h e

slavikrds [6]

Answer: The average speed of the runner is 6.618 miles/hr

Explanation:

Average speed is defined as the ratio of total distance traveled to the total time taken.

To calculate the average speed of the runner, we use the equation:

$\text{Average speed}=\frac{\text{Total distance traveled}}{\text{Total time taken}}$

We are given:

Distance traveled = 4339 ft

Time taken = 7.45 mins

Putting values in above equation, we get:

$\text{Average speed of runner}=\frac{4330ft}{7.45min}=582.42ft/min$

To convert the speed into miles per hour, we use the conversion factors:

1 mile = 5280 ft

1 hr = 60 mins

Converting the speed into miles per hour, we get:

$\Rightarrow \frac{528.42ft}{min}\times (\frac{1miles}{5280ft})\times (\frac{60min}{1hr})\\\\\Rightarrow 6.618mil/hr$

Hence, the average speed of the runner is 6.618 miles/hr

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3 years ago

What is the ozone hole and how does it affect humans?

denis-greek [22]

Answer:

Ozone layer depletion causes increased UV radiation levels at the Earth's surface, which is damaging to human health. Negative effects include increases in certain types of skin cancers, eye cataracts and immune deficiency disorders.

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2 years ago

Read 2 more answers