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garri49 [273]
3 years ago
10

When placed in a freezer, liquid water turns into solid ice. Why is this considered a physical change? A. The physical structure

of the water molecules change as bonds are broken and atoms are rearranged.. B. Only the motion and arrangement of the particles changes, not the identity of the substance.. C. The water molecules react when exposed to the cold temperature, causing the atoms to separate.. D. Only the arrangement of the atoms within the molecules changes, not the distance between them
Chemistry
2 answers:
avanturin [10]3 years ago
6 0

<span>A physical change changes the bonds between molecules of the substance. so option a is right.</span>
oksian1 [2.3K]3 years ago
3 0
B. Only the motion and arrangement of the particles changes, not the identity of the substance
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I can deduce here that the best that describes my choice is: It’s my best explanation for now, but I really would have to test my idea to be sure.

<h3>What is choice?</h3>

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8 0
2 years ago
the half life of the radioactive element strontium-90 is 29.1 years. If 16 grams of strontium-90 are initially present, how many
8_murik_8 [283]

Answer:

4 g after 58.2 years

0.0156 After 291 years

Explanation:

Given data:

Half-life of strontium-90 = 29.1 years

Initially present: 16g

mass present after 58.2 years =?

Mass present after 291 years =?

Solution:

Formula:

how much mass remains =1/ 2n (original mass) ……… (1)

Where “n” is the number of half lives

to find n

For 58.2 years

n = 58.2 years /29.1 years

n= 2

or  291 years

n = 291 years /29.1 years

n= 10

Put values in equation (1)

Mass after 58.2 years

mass remains =1/ 22 (16g)

mass remains =1/ 4 (16g)

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Mass after 58.2 years

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mass remains = 0.0156g

8 0
4 years ago
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Answer:

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3 years ago
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frez [133]

Answer:

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Explanation:

2CO(g)     +   O₂(g)    =>    2CO₂(g)

? Liters          32.65g

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___________________

*Standard Equation => molecular rxn balanced to smallest whole number ratio coefficients is assumed to be at STP conditions (0°C & 1atm).

6 0
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