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3 years ago

9

Which observation would most likely indicate that an endothermic reaction has occurred? O A. a color change O B. the production

of gas bubbles O C. an increase in temperature OD. a decrease in temperature

1 answer:

Marina CMI [18]3 years ago

7 0

Answer:

that's allow points

........

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The average person in the United States is exposed to the following amount of radiations annually. Rank the following source of

Papessa [141]

<span>#1 is air radon, #2 is x-ray, #3 is ground, #4 is cosmic radiation, #5 is TV tube, #6 is weapons test fallout . That's all I got hope I helped!</span>

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How long is 5 half lives if the half life is 2.6 hours? Remember to round to the correct number of significant figures and use u

Dmitry [639]

Answer:

$\Delta t = 13\,h$

Explanation:

Half time is period required to desintegrating the half of the initial number of atoms. Then, the total time is:

$\Delta t = 5\cdot (2.6\,h)$

$\Delta t = 13\,h$

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3 years ago

How do I Balancing Chemical Equations

Black_prince [1.1K]

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Explanation:

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3 years ago

Match each type of learning to the correct definition.

andreev551 [17]

Answer:

conditioning

trial-and-error learning

insight learning

imprinting

the process of associating a stimulus with a good or bad outcome

the process of using prior knowledge to solve a problem

a bond to a individual or object shortly after birth or hatching

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3 years ago

Silver had a density of 10.5 grams per cubic centimeter. What is the mass of 4.0 mL of silver?

Likurg_2 [28]

Explanation:

Given parameters:

Density of silver = 10.5g/cm³

Volume of silver given = 4mL

Unknown:

Mass of silver = ?

Solution:

Density of a substance can be expressed as its mass per unit volume

Density = $\frac{mass}{volume}$

we need to convert our volume to cm³ from mL;

1cm³ = 1mL

So 4mL = 4cm³

input the values in;

Mass = density x volume = 10.5 x 4 = 42g

learn more:

Density brainly.com/question/8441651

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4 years ago