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ICE Princess25 [194]

3 years ago

14

Which of the following happens during a chemical change? Check all of the boxes that apply

1 answer:

taurus [48]3 years ago

3 0

Answer:

One atom or more changes into atoms of another element.New subtances with different properties are formed.

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How did the first DNA formed

blsea [12.9K]

Experiments suggest that organic molecules could have been synthesized in the atmosphere of early Earth and rained down into the oceans. RNA and DNA molecules — the genetic material for all life — are just long chains of simple nucleotides. Replicating molecules evolved and began to undergo natural selection.

6 0

2 years ago

Read 2 more answers

enny places a strip of pH paper into a solution. When she removes the pH paper, it has turned yellow-green. What should Jenny do

Svetllana [295]

Compare it to the chart showing how base or acidic a substance is

8 0

3 years ago

ankoles [38]

1kg is about 2.2 pounds. So 4kg = 8.8 pounds. If that represent 19% of the total, here is the answer.
0.19*x=8.8
x=8.8/0.19
x=46.31 pounds

3 0

2 years ago

In an acid-base titration, a student uses 21.35 mL of 0.150 M NaOH to neutralize 25.00 mL of H2SO4. How many moles of acid are i

GalinKa [24]

Answer: There are 0.006 moles of acid in the flask.

Explanation:

Given: $V_{1}$ = 21.35 mL, $M_{1}$ = 0.150 M

$V_{2}$ = 25.0 mL, $M_{2}$ = ?

Formula used to calculate molarity of $H_{2}SO_{4}$ is as follows.

$M_{1}V_{1} = M_{2}V_{2}$

Substitute the values into above formula as follows.

$M_{1}V_{1} = M_{2}V_{2}\\0.15 M \times 21.35 mL = M_{2} \times 25.0 mL\\M_{2} = 0.1281 M$

As molarity is the number of moles of a substance present in a liter of solution.

Total volume of solution = $V_{1} + V_{2}$

= 21.35 mL + 25.0 mL

= 46.36 mL (1 mL = 0.001 L)

= 0.04636 L

Therefore, moles of acid required are calculated as follows.

$Molarity = \frac{no. of moles}{Volume (in L)}\\0.1281 M = \frac{no. of moles}{0.04635 L}\\no. of moles = 0.006 mol$

Thus, we can conclude that there are 0.006 moles of acid in the flask.

3 0

3 years ago

an animal refuge park has 120 gazelles.If the population increases by 5% in one year, how manu gazells will the park have next y

Aneli [31]

120 x 1.05 = 126 gazelles next year.
If you times it by 105% then you get the answer of adding 5% on.

8 0

3 years ago