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SSSSS [86.1K]
3 years ago
8

EMERGENCY HELP DUE IN 10 MIN!! I WILL MARK BRAINLIEST WHOEVER ANSWERS FIRST JUST PLS HELP!!

Chemistry
2 answers:
Airida [17]3 years ago
6 0
If the object has a lower density than the fluid it is in, it will float.

So for the wood one, water has a density of 1g/cm so the wood would float.

For the second one the vegetable oil has the lowest density since it’s at the top
Butoxors [25]3 years ago
3 0

Answer:

1 float

2 vegetable oil

Explanation:

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The atmosphere protects us from all of the following except (4 points)
denis-greek [22]

Global warming, Cosmic Background radiation (even though most is blocked not ALL), and pollution.

8 0
3 years ago
Propanoic acid, ch3ch2cooh, has a pka =4.9. draw the structure of the conjugate base of propanoic acid and give the ph above whi
xenn [34]

Conjugate base of Propanoic acid (CH_{3}CH_{2}COOH is propanoate where -COOH group gets converted to -COO^{1-}. The structure of conjugate base of Propanoic acid is shown in the diagram.

The p^{H} above which 90% of the compound will be in this conjugate base form can be determined using Henderson's equation as propanoic acid is weak acid and it can form buffer solution on reaction with strong base.

p^{H}= p^{k_{a}+ log\frac{[Conjugate base]}{[acid]}=4.9+log\frac{90}{10}=5.85

As 90% conjugate base is present, so propanoic acid present 10%.

8 0
3 years ago
Erbium (Er) is element 68 on the periodic table. A sample contains 5.04×1023 atoms of Er. Calculate the amount of Er.
Korvikt [17]

Answer:

139.98 g to nearest hundredth.

Explanation:

Using Avogadro's Number:

One mole (167.26 g) of Erbium  equates to  6.022141 * 10^23 atoms.

So 5.04 * 10^23 = 167.26 * 5.04/6.022141

= 139,98 g.

3 0
3 years ago
Do bases react with metals the same way that acids do?.
mina [271]

Answer:

Bases do not react with metals in the way that acids do

Explanation:

hope this helps

pls mark brainliest

6 0
1 year ago
If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what woul
bazaltina [42]

To solve this we assume that the gas is an ideal gas. Then, we can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

 

P1V1 =P2V2

<span>P2 = P1V1/V2</span>

<span>
</span>

<span>The correct answer is the first option. Pressure would increase. This can be seen from the equation above where V2 is indirectly proportional to P2.</span>

8 0
2 years ago
Read 2 more answers
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