CHEMISTRY MIDDLE SCHOOL

What variable can you change in an experiment?

Answers

Answer 1

Answer:

Answer:

independent variable

Explanation:

Answer 2

Answer:

Answer:

independent value =)

Explanation:

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Where do glaciers come from

Answers

Answer:GLACIERS ARE MADE UP OF FALLEN SNOW OVER MILLION YEARS, IN MOST OF POLAR REGIONS IT TURNS TO ICE AND WILL FLOW DOWNWARDS AND OUTWARDS UNDER ITS OWN PRESSURE

AND THE LARGEST GLACIER IN THE WORLD IS 60 MILES WIDE AND AROUND 270 MILES LONG.

IT COVERS 10% OF EARTH'S TOTAL LAND

Explanation:

How many atoms in 54.0 g of aluminum

Answers

There are 12.052 ×10²³ atoms in 54 g of aluminium according to the concept of Avogadro's number.

What is Avogadro's number?

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number

Substituting the values in the formula,54/26.98×6.022×10²³=12.052×10²³ atoms .

Hence, there are 12.052×10²³ atoms in 54 g of aluminium.

Learn more about Avogadro's number ,here:

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Jane is on a merry-go-round that is moving at a constant speed. Her velocity is also constant.True
False

Answers

the correct answer is False.

What is the purpose of phosphates in fertilizerwhat is the purpose of phosphates in laundry detergent

Answers

Fertilizers provide soil with nutrients, like phosphate, that are required to produce healthy gardens and abundant crops. The Fertilizer Institute reports that experts estimate one-third of the world's food supply would not be produced without the use of commercial fertilizers....i hope i help u....

Phosphates make the soil fertile, and enrich the soil with phosphorous.

Phosphates are used in laundry detergents. Phosphate reacts with dirt in clothes and removes them.

Determine from the balanced chemical reaction ifthe derived mole ratio is correct or incorrect.
4Zn + 10HNO3 + 4Zn(NO3)2 + N20 + 5H20

Help me please

Answers

Answer:

The equation is balanced

Explanation:

Before a equation can be said to be balanced the number of mole at the reaction side must be equal to number mole at the product side

Let's start with Zn at the reactant side 4 moles of Zn reacts and 4 moles of Zn was obtained from the product side which makes it balanced

Let's take HNO3

For H,10 moles react and 10 moles was obtained in the product side

For N,10 moles react and 8 moles was obtained initially and 2 moles was obtained as well which makes it 10 moles and it makes it balanced

For O,30 moles react and after calculating the total amount of O at the product side it was observed to be 30 which indicates that the equation is balanced...

The equation is absolutely well balanced

what is the molarity of a solution prepared by dissolving 1.25g of HCL gas into enough water to make 30cm cube of solution?

Answers

30 cm³ / 1000 = 0.03 L

Molar mass HCl = 36.46 g/mol

number of moles:

mass of solute / molar mass

1.25 / 36.46 = 0.03428 moles

M = n / V

M = 0.03428 / 0.03

M = 1.14267 mol/L⁻¹

hope this helps!

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