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4 years ago

Which of these statements is true and can be illustrated by the image?

Chemistry

2 answers:

sergey [27]4 years ago

6 0

Answer:

Explanation:

The gravitational force exerted by Earth on objects is directed downward towards Earth's center.

mamaluj [8]4 years ago

4 0

Answer:

The answer to your question is the second choice

Explanation:

From the image, we discard the first option because the only planet that we observe is the earth and the description mentions all planets and the sun.

The right answer is letter B because in the image we observe the earth and the arrows that represent the force exerted by the earth downwards directed to the center of the earth.

Letter c is wrong because it mentions gravitational forces in all directions and the forces in the image go in only one direction.

Letter D is incorrect because we can see only the earth.

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PLEASE HELP ME If a radioactive substance has an initial mass of 50 grams

Yuri [45]

Answer: $3.125\ g$

Explanation:

Given

Initial mass $A_o=50\ g$

half-life is $T_{\frac{1}{2}}=5\ years$

At any time the left amount is given by

$A=A_o2^{-\dfrac{t}{T_{\frac{1}{2}}}}\\\\\text{Insert the values}\\\\A=50\cdot 2^{-\dfrac{20}{5}}\\\\A=50\cdot 2^{-4}\\\\A=\dfrac{50}{16}\\\\A=3.125\ g$

3 0

3 years ago

Determine the number of molecules in 43.9 g of carbon tetrachloride

ddd [48]

Answer: There are about 0.28 molecules in 43.9 g of carbon tetrachloride. If you are rounding up, it would be 0.3

Explanation:

7 0

3 years ago

If 10.0 liters of oxygen at STP are heated to 785.15 °K, what will be the new volume of gas if the pressure is also increased to

Ugo [173]

Answer: The new volume of gas is 28.5 L

Explanation:

The combined gas equation is,

$\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}$

where,

$P_1$ = initial pressure of gas = 1.00 atm (at STP)

$P_2$ = final pressure of gas = 102.6 kPa = 1.01 atm (1 kPa= 0.0098 atm)

$V_1$ = initial volume of gas = 10.0 L

$V_2$ = final volume of gas = ?

$T_1$ = initial temperature of gas = $273.15K$ (STP)

$T_2$ = final temperature of gas = $785.15K$

Now put all the given values in the above equation, we get:

$\frac{1.00\times 10.0}{273.15}=\frac{1.01\times V_2}{785.15}$

$V_2=28.5L$

The new volume of gas is 28.5 L

8 0

3 years ago

A good definition of snow and how snow is important to the water cycle.

IRISSAK [1]

Snow is the result of moisture and low temperatures colliding; when they collide, they become tiny ice crystals. When ice crystals stick to one another, they become snowflakes. Snow is important to the water cycle because when they precipitate to the earth, they start to melt on surfaces warmer than themselves. The melted result becomes water, and when the water either seeps into the ground or flows into a source of water nearby, the water cycle's process repeats all over again.

I hope you like this answer, please Brainliest me, and have a great day! :D

7 0

4 years ago

Draw the structure of the following three isomeric esters with chemical formula C7H12O2. Ester #1: methyl 1-methylcyclobutanecar

marissa [1.9K]

Answer:

The following three isomeric structure are given below.

Explanation:

Structure of the following three isomeric esters with chemical formula C₇H₁₂O₂

Ester #1: methyl 1-methylcyclobutanecarboxylate

Ester #2: (E)-methyl 3-methyl-3-pentenoate

Ester #3: isopropyl 2-methylpropenoate

6 0

3 years ago