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3 years ago

Question 12 (1 point)

Chemistry

2 answers:

Vinvika [58]3 years ago

8 0

Answer:

Option c. Neutral

Explanation:

Only neutral solution gives a green colouration to a pH paper

marishachu [46]3 years ago

5 0

Neutral
There was no change on the red or blue litmus and the ph paper turned green because it had a pH of 7

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Will 1 gram of sugar or 1 gram of salt dissolve more quickly which one

Montano1993 [528]

1 gram of sugar because super molecules are bigger then the ions of dissolved salt

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2 years ago

What is the daughter nuclide when 0-15 experiences positron emission?

Helen [10]

The daughter isotope (a decay product)of O-15 = N-15(Nitrogen 15)

<h3>Further explanation </h3>

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,

alpha α particles ₂He⁴
beta β ₋₁e⁰ particles
gamma particles γ
positron particles ₁e⁰

O-15 emits positron particles ₁e⁰, so the atomic number decreases by 1, the mass number is the same

Reaction

$\tt _8^{15}O\Rightarrow _7^{15}N+_1^0e$

The mass number of the daughter isotope = 15, atomic number = 7

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2 years ago

How to know how many valence electrons are in an element

Alenkinab [10]

Answer:

Hope it helped

Explanation:

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3 years ago

A cast fossil is formed when

Liono4ka [1.6K]

The answer is D)
<span>when the remains of a living thing are preserved and turned into rock </span>

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3 years ago

A student measures the mass of a sample as 9.64 g. Calculate the percentage error, given that the correct mass is 9.80 g.

rosijanka [135]

Answer:

<h3>The answer is 1.63 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

$P(\%) = \frac{error}{actual \: \: number} \times 100\% \\$

From the question

actual mass = 9.80 g

error = 9.80 - 9.64 = 0.16

We have

$p(\%) = \frac{0.16}{9.80} \times 100 \\ = 1.632653061...$

We have the final answer as

Hope this helps you

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3 years ago