CHEMISTRY HIGH SCHOOL

What is ph?how basic a solution is
how acidic a solution is
the concentration of potassium ions in a solution
the concentration of hydrogen ions in a solution

Answers

Answer 1
Answer: I think the best option is the fourth statement. pH is the measure of the concentration of hydrogen ions in a solution. It is expressed as: pH = -log [H+]. However, it is also an indicator of the acidity and alkalinity of a solution.
Answer 2
Answer:

Answer:

The concentration of hydrogen ions in a solution

Explanation:

I got it right on the test!

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Is a haircut a physical or chemical change?

Answers

A haircut is physical because it just becomes shorter. Its chemical makeup is not altered.
Hope that helped you.

It's a physical because you have to actually do the work by using your hand to give a haircut

A material will float on the surface of a liquid if the material has a density less than that of the liquid. Given that the density of water is approximately 1.0 g/mL, will a block of material having a volume of 1.2 x 10^4 in^3 and weighing 350 lb float or sink when placed in a reservoir of water? [I just don't want the answer, I'd like to know how to solve this, please.]

Answers

Density is defined as the ratio of mass to volume of a substance.

The density of water is generally known to be 1.0 g/mL. Substances that are less dense than water will float on water while substances that are denser than water will sink in water.

We have to calculate the density of the block material in units of g/ml.

Volume of the block =1.2 x 10^4 in^3 = 19.66 mL

Mass of the block = 350 lb = 158757 g

Density of the block = (mass)/(volume)

Density of block = (158757 g)/( 19.66 mL)

= 8075.13 g/mL

Hence the block material will sink in water.

Learn more: brainly.com/question/14373997
Given:
density of water is approximately 1.0 g/mL
block of material
volume of 1.2 x 10^4 in^3
and weighing 350 lb

Required:
Which will float

Solution:
D = M/V where D is density, M is mass and V is volume

convert 1.2 x 10^4 in^3 into mL
1.2 x 10^4 in^3 (16.39 mL/ 1 in3) = 196,980 mL

convert 350 lb into grams
350 lb (454 grams/1 lb) = 158,900 grams

D = M/V = 158,900 grams/ 196,980 mL
D = 0.807 g/mL

The block will float in water because it is less dense than water

In an atom: The nucleus is made of electrons and protons. Protons have positive charges. Neutrons have negative charges. All of the above.

Answers

Answer: (b) protons have positive charges

In any pure sample of CO2, the ratio of the mass of carbon to the mass ofoxygen is always the same. You can justify this ratio by the fact that
compounds are composed of which of the following?
A. Identical molecules created from atoms combined in whole
number ratios
B. Atoms whose chemical properties do not change during a
chemical reaction
O C. Atoms whose masses do not change during a chemical reaction
D. Different molecules which together produce the observed
elemental ratios

Answers

Identical molecules created from atoms combined in whole number ratios this is the best justification for In any pure sample of CO2, the ratio of the mass of carbon to the mass of oxygen is always the same.

What ratio of Mass of Oxygen and Carbon?

  • Consider the elements carbon and oxygen. Combined in one way, they form the familiar compound carbon dioxide. In every sample of carbon dioxide, there are 32.0g of oxygen present for every 12.0g of carbon. By dividing 32.0 by 12.0, this simplifies to a mass ratio of oxygen to carbon of 2.66 to 1.
  • Carbon has an atomic weight of 12, oxygen in diatomic form(O2) of 32 and CO2 of 44. This means that the mass of 6x1023 atoms of CARBON has a mass of 6 kilograms, the mass of 6x1023 diatomic oxygen molecules is 32 kg, and for CO2 it is 44kg. So carbon is the lightest and CO2 the heaviest.

Identical molecules created from atoms combined in whole number ratios this is the best justification for In any pure sample of CO2, the ratio of the mass of carbon to the mass of oxygen is always the same.

To learn more about Mass of Oxygen and Carbon refer:brainly.com/question/25996574

#SPJ2

Answer:A

Explanation:por q si bb

seawater contains % (by mass) of potassium. how many grams of potassium are there in 2.86 l of seawater? the density of seawater is 1.025 .

Answers