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3 years ago

A cat climbs a tree. What chemical process is taking place to

Chemistry

1 answer:

Dafna11 [192]3 years ago

8 0

Answer:

When i cat climbs a tree it is using energy that was stored away. When you eat you are storing that energy in the food. when you cimb a tree you are burning calorius from that meal.

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I think it’s B because I just know

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3 years ago

Which particles that make up an atom are involved in nuclear reactions?

Bezzdna [24]

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protons and neutrons- second choice

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3 years ago

What common item can detect the presence of radiation? A. Bleach B. A roll of photographic film C. LED watch D. Baking soda

Alenkinab [10]

Answer: B- a roll of photographic film

Explanation:

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3 years ago

Read 2 more answers

Carbon-14 has a half-life of 5730 years. If you start with a 2.37 g sample, how much would remain after 17,190 years?

balu736 [363]

Answer:

5,730 years; The graph shows that 50 percent of the carbon-14 atoms have decayed after 5,730 years, so 5,730 is the half-life of carbon-14.

Explanation:

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3 years ago

An impure sample of solid Na₂CO₃ is allowed to react with 0.1755 M HCl.

jasenka [17]

Answer: Thus percentage purity of sodium carbonate is 60.83%.

Explanation:

$Na_2CO_3 + 2HCl \longrightarrow 2NaCl + CO_2 + H_2O$

Volume of the HCl solution ,V = 15.55 mL= 0.01555 L

Concentration of HCl solution ,C= 0.1755 M

Moles of HCl in 0.1755 M solution = n

$Molarity=\frac{n}{V(L)}$

$n=C\time V=0.1755 M\times 0.01555 L = 2.729\times 10^{-3} mol$

According o reaction 2 moles of HCl reacts with 1 mole of sodium carbonate.

Then n moles of HCl will react with:

$\frac{1}{2}\times n=\frac{1}{2}\times 2.729\times 10^{-3} mol=1.3645\times 10^{-3} mol$ of sodium carbonate.

Mass of $1.364\times 10^{-3} mol$ of sodium carbonate:

$1.364\times 10^{-3} mol\times 106 g/mol=0.144584 g$

Mass of the sample given= 0.2377 grams

Mass used up in reaction = 0.144585 g

percentage purity= $\frac{0.144585}{0.2337}\times 100=60.83\%$

Thus percentage purity of sodium carbonate is 60.83%.

4 0

4 years ago