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8090 [49]
3 years ago
9

Science quiz question #9

Chemistry
1 answer:
11111nata11111 [884]3 years ago
3 0

Answer: I would say its either exit door or the last one.

Explanation: Hope this helps plz mark brainliest.

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1. What is the density, in g/cm², of a substance weighing 22.2 cg with dimensions of 0.333
RUDIKE [14]
  • Mass=22.2cg=2.22g

Volume:-

\\ \tt\longmapsto 0.333(0.444)(0.555)=0.08cm^3

So

\\ \tt\longmapsto Density=\dfrac{Mass}{Volume}

\\ \tt\longmapsto Density=\dfrac{2.22}{0.08}=27.75g/cm^3

7 0
2 years ago
What is the answer for this please ?<br> HNO3 + OH →
BartSMP [9]

Answer:

HNO3(aq) + OH-(aq) → NO3-(aq) + H2O(l)

Explanation:

According to Bronsted-Lowry theory, an acid is a substance that donates a proton (H+) and produces a conjugate base while a base is a molecule or ion which accepts the proton.

An example of Bronsted-Lowry acid and base is Nitric acid, HNO3 and hydroxide ion, OH- respectively as shown in the given reaction.

Thus, the nitric acid acts as an acid by donating a proton to the hydroxide ion which accepts it, thus producing nitrate ion, NO3- as a conjugate base, while OH- produces H2O as a conjugate acid.

8 0
3 years ago
Offspring, or young, ______ to look like their parents, but are ___ the ________.
faltersainse [42]

Answer:

Tend. Similar. Parents. (sorry if it's wrong. It's kinda confusing on the last 2 words. Make it more clearer pls to get a better answer)

Explanation:

6 0
3 years ago
The number of particles in one mole of a chemical substances is 602,200,000,000,000,000,000,000 particles. What is the correct w
crimeas [40]

The correct way to write this number in scientific notation : 6.022 x 10²³

<h3>Further explanation </h3>

Scientific Notation is a standard form of writing numbers used in mathematical operations

The rules:

1. Writing order : first digit, decimal point, next digit

2. Then followed by powers of 10 (the value can be +/-)

If the value is> 10 (the power of 10 is +), the decimal point is moved to the left, to the right of the first digit

If the value is <10 ((the power of 10 is -), the decimal point is moved to the right, to the right of the first digit

I certainly didn't count the details of the number of zeros listed, but only saw the answer choices.

And the right ones are: 6.022 x 10²³

3 0
3 years ago
Read 2 more answers
Part A
MariettaO [177]

Answer:

96.3%

Explanation:

Data obtained from the question include:

Theoretical yield = 54g

Actual yield = 52g

Percentage yield =..?

The percentage yield can be obtain as follow:

Percentage yield = Actual yield /Theoretical yield x 100

Percentage yield = 52/54 x 100

Percentage yield = 96.3%

Therefore, the percentage yield of the reaction is 96.3%

3 0
3 years ago
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