Is this a chemical or physical property;

Sandpaper is scratchy

Answers

Answer 1

Answer: Physical because you can feel that the Sandpaper is scratchy.

Answer 2

Answer: That is a physical property

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A girl throws a rock into a pond. A leaf floating on the pond bobs up and down but does not change location on the pond's surface. Why not?

Answers

This is due to the difference in density. The rock is denser than the leaf. And also, the rock is denser than the liquid in the pond. If the material is denser than the other material, it will sink. The same holds true for the rock, it sinks. But when the material is less dense than the other material, it floats. And it holds true for the leaf, it floats.

Ricardo wants to determine the length of a strip of zinc metal. What is the SI unit for length? foot inch liter meter

Answers

Answer : The correct option is, meter

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, the S.I unit of length of a strip of zinc metal is, meter.

Hence, the correct option is, meter

The Si unit for length is meters.

Where are people exposed to chemicals?O A. Mostly in public buildings
O B. Only in the home
C. Mostly outside
O D. Everywhere

Answers

Answer:

I believe the correct answer is D.

Explanation:

You are breathing in dinitrogen and dioxygen. You exhale dinitrogen and carbon dioxide. And the atmosphere contains traces of other gases. You drink water. You have a wash with water, and soap. You eat carbohydrates and proteins. You ride to work on a vehicle powered by hydrocarbons, which spits out carbon dioxide exhaust fumes, and also some nitrogen oxides. And so your exposure to chemicals is pervasive, and unavoidable.

Answer:

Explanation:

Why does the flow of science just keep going

Answers

Answer:

The Flow of science keeps going because not everything is fully discovered yet. New things are discovered everyday and are also made better as well.

Explanation:

Net ionic equation for Lead acetate (II) + potassium chromate

Answers

Answer:Pb ( C2 H3O2)2 + K2 CrO4 → Pb CrO4 + 2 CH3 CO2K

Explanation:

The balanced molecular equation for the reaction between lead (II) acetate and potassium chromate is ^

How many moles of tungsten atoms are in 4.8 × 1023 atoms of tungsten?

Answers

Answer:- 0.80 moles

Solution:- Number of atoms of tungsten are given and we are asked to calculate the moles of tungsten atoms. So, it is a atom to mole conversion and for this we use the Avogadro number.

Number of atoms are divided by Avogadro number to get the number of moles.

Avogadro number is $6.022*10^2^3$ . Given number of atoms is $4.8*10^2^3$ . let's divide it by Avogadro number.

$4.8*10^2^3atoms((1mol)/(6.022*10^2^3atoms))$

Numerator and denominator has equal exponent so it is canceled. So, we only need to divide 4.8 by 6.022 and round the answer to two sig figs as given number of atoms has only two sig figs.

$4.8((1mol)/(6.022))$