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3 years ago

Marco wants to investigate the chemical properties of sodium bicarbonate, or baking soda. He plans to carry out the tests below.

Physics

1 answer:

SSSSS [86.1K]3 years ago

6 0

Answer:

The options are:

Test 1: Mix a teaspoon of sodium bicarbonate into a cup of warm water to see if it dissolves.

Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.

Test 3: Heat a teaspoon of sodium bicarbonate in the oven to see if its melting point is less than 400 degrees Fahrenheit.

Which statement provides the best assessment of his tests?

The answer is Test 2: Mix a teaspoon of sodium bicarbonate into a cup of vinegar to see if it fizzes.

This is because it will indicate the chemical property of the sodium bicarbonate as a result of its reaction with another chemical compound, a vinegar.

Tests 1 and 3 will show a physical property of the substance as a result of the physical characteristics such as solubility and melting point .

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Which of the following statements about electric field lines due to static charges are true? (Select all that apply.)

anastassius [24]

Answer:

a. Electric field lines can never cross each other.

d. Wider spacing between electric field lines indicates a lower magnitude of electric field.

Explanation:

a. The electric field lines cannot be crossed, since this would mean that there would be more than one electric field vector for the same point at the place where the crossing occurs.

d. The space between the field lines is inversely proportional to the intensity of the electric field.

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3 years ago

Compare and contrast the formulas for water and hydrogen peroxide. (site 1)

ioda

Explanation:

The chemical formula of a compound is a representation which shows all the elements therein and the mole relationship between them expressed as subscripts.

Water H₂O Hydrogen peroxide H₂O₂

Contrast

Water is a compound made up of 2 moles of hydrogen and 1 mole of oxygen

Hydrogen peroxide is made up of two moles of hydrogen and and 2 moles of oxygen.

Comparison:

Water and Hydrogen peroxide are made up of two elements:

Hydrogen and oxygen

H O

learn more:

chemical formula brainly.com/question/4467499

#learnwithBrainly

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3 years ago

How can neptune have more mass than uranus but a smaller diameter?

SVEN [57.7K]

Neptunes' average density is larger than that of Uranus. Hope this helps!

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3 years ago

6. In baseball, a fastball takes about 1/2 second to reach the plate. Assuming that such a pitch is thrown horizontally, compare

klio [65]

Answer:

<em>The ball falls 0.3 m in the first 1/4 seconds, and it falls 0.92 m in the second 1/4 second</em>

Explanation:

<u>Horizontal Launch </u>

When an object is thrown horizontally with a speed v from a height h, it describes a curved path ruled exclusively by gravity until it eventually hits the ground.

To calculate the vertical distance (y) traveled by the object in terms of the time (t) we use:

$\displaystyle y=\frac{g.t^2}{2}$