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3 years ago

1. When the velocity of an object changes, it is acted upon by a(n)

Chemistry

1 answer:

krek1111 [17]3 years ago

3 0

Answer:

when the velocity of an object changes,it is acted upon by an external force

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Which of the following is a property of a pure substance?

wolverine [178]

D.) the original components retain their individual properties

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3 years ago

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What is the mass of water necessary to generate 11.2 L of hydrogen gas if calcium metal reacts with water at standard temperatur

12345 [234]

Answer:

The mass of water is 18 g

Explanation:

The reaction of calcium with water can be represented in the equation below:

Ca + 2H₂O --------->Ca(OH)₂ +H₂

1 Mole of gas at STP = 22.4L

From the displacement reaction above, calculate the mass of water that will produce 22.4L of hydrogen gas at STP.

Mass of 2H₂O = 2(2x1 + 16) = 2X18 = 36 g/mol

Using proportional analysis;

36 g of 2H₂O produced 22.4 L of H₂, then

what mass of 2H₂O will produce 11.2L of H₂ ?

Mathematically,

22.4 L ----------------------------------> 36g

11.2 L -----------------------------------> ?

Cross and multiply, to obtain the expression below

= (11.2 X 36)/22.4

= 18 g

Therefore, the mass of water is 18 g

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3 years ago

A rod measures 17.2 inches.<br> How many centimeters is<br> this?<br> [ ? ] cm

Rufina [12.5K]

This problem is providing the length in inches of a rod and it is being required to convert it to centimeters. According to the following, the answer will be 43.7 cm:

<h3>Units conversion:</h3><h3 />

In science, we use units conversion to represent measurements in different types of units depending on a specific requirement. To do so, we use conversion factors based on equivalence statements, relating the required unit with the given one.

In this case, the equivalence statement between inches and centimeters is 2.54 cm = 1 in and we can use it to get the answer as shown below:

$17.2in*\frac{2.54cm}{1in} \\\\=43.7 cm$

Learn more about units conversion: brainly.com/question/13016491

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2 years ago

A mixture of propane and butane is fed into a furnace where it is mixed with air. the furnace exhaust leaves the furnace at 305°

IgorLugansk [536]

In this item, I supposed, that we are determine the molar fraction of oxygen and carbon dioxide in the sample. This can be done by dividing their respective partial pressures by the total pressure of the sample.

O2 : mole fraction = (100.7 mmHg) / (763.00 mmHg) = 0.13

CO2 : mole fraction = (33.57 mmHg) / (763.00 mmHg) = 0.044

Answers: O2 = 0.13
CO2 = 0.044

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3 years ago

4. Identify What do scientists call a substance that forms during a chemical reaction?

ioda

Answer:

4. Reactant

5. Left

I hope this helps ❤️❤️

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3 years ago