2 years ago

A pH change can be evidence that

1 answer:

7 0

Answer:

Explanation:The pH scale ranges from 0 to 14. The pH of a solution is a measure of its acidity or alkalinity (base). ... A change of one unit on the pH scale represents a change in the concentration of hydrogen ions by a factor of 10, a change in two units represents a change in the concentration of hydrogen ions by a factor of 100.

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What is the density if a sample of rock has a mass of 69 g and a volume of 23 ml?

kiruha [24]

Density = mass / volume

= 69g / 23 ml

= 3 g / ml.

Thus, the density of the sample is 3 grams per ml or 3g/ ml

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3 years ago

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What is the formula for tin(IV) sulfide? A. Sn4S B. SnS2 C. Sns D. SnS4

defon

Answer:

$SnS_{2}$

Explanation:

The formula for tin(IV) sulfide is SnS $_{2}$

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2 years ago

Radiation is spontaneously emitted from hydrogen-3 nuclei, but radiation is not spontaneously emitted from hydrogen-l nuclei or

miv72 [106K]

Answer : Option 1) nuclei of $H^{1}$ and nuclei of $H^{2}$ only.

Explanation : Radiation is spontaneously emitted from nuclei of $H^{3}$ because this isotope of hydrogen is highly radioactive as compared to other isotopes of hydrogen namely; nuclei of $H^{1}$ and nuclei of $H^{2}$ .

They have much stable nucleus as compared to nuclei of $H^{3}$ .

The more it is unstable the more radiations will be emitted from its nucleus.

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3 years ago

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Which of kbr or ch3br is likely to have the higher normal boiling point?

allsm [11]

Answer:

KBr

Explanation

KBr is an ionic compound which have very high BP since they exist as 3D crystals

Methyl Bromide, CH3Br. is a covalent compound which have low BP since they exist as individual molecules

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2 years ago

Write a balanced equation for the following:

Ket [755]

(ANS1)— P4 + 5O2 ---> 2P2O5

(ANS2)— C3H8 + 5O2---> 3CO2 + 4H20

(ANS3)— Ca2Si + 4Cl2 ---> 2CaCl2 + SiCl4

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2 years ago