What is the number of grains of rice in the 40 mL sample? Show all of your work using dimensional analysis.

The number of grains of rice in the 40 mL sample : 880 grains

Given

from recorded data:

mass of 20 grains rice = 0.4 g

mass beaker = 29.5 g

mass beaker+rice=47.1 g

mass only rice = 17.5 g

Required

the number of grains of rice

Solution

Maybe if we use a digital scale with high resolution accuracy we can get the mass of 1 grain of rice

But we still use existing data

To determine the mass of rice in the beaker, we just need to find the difference between the mass of the beaker + rice - beaker, or we can set the scale to zero before we add rice to the beaker.

If we look at this difference, the mass of the rice in the beaker should be :

47.1-29.5 = 17.6 g

Since the data shows that 20 grains of rice mass 0.4 g, so 17.6 g of rice contains:

[tex]\tt 17.6~g\times \dfrac{20~grains}{0.4~g}=880~grains[/tex]

After studying weather, Beto bought a simple weather station and put it up in his yard. He was especially interested in wind and how it forms around Earth. Choose the correct words or phrases to complete the sentences.

What family has 4 valence electrons?

The mass of a person on Earth is 72 kg. What is the mass of the same
person on the Moon where gravity is one-sixth that of Earth?
12 kg
60 kg
432 kg
72 kg

Select three parts of the cell theory.
A- All cells come from pre-existing cells.
B- Cell is the official name of the smallest unit of life.
C- All plants and animals are made from cells.
D- Cells are the basic unit of structure and function in organisms.

Which part of the ocean has the lowest temperatures and highest salinity?

a student wrote The Following hypothesis if more salt is added to a hypothesis

Which of these do plants need for photosynthesis to occur?
OA.
glucose and water
ов.
glucose and carbon dioxide
OC.
water and carbon dioxide
OD.
water and oxygen

How are a proton and a neutron alike?
A. Each is found outside the nucleus.
B. Each has a positive charge.
C. Each has a mass of1 amu.
D. Each has a charge that balances the charge of an electron.

Which organism is able to form organized patterns of behavior through the process of integration because it has ganglia?

-mouse
-shark
-grasshopper
-flatworm

someone plss help me ASAP

2. What is true about the position of all metals in
the periodic table?
A. They are in the first group.
B. They are in the bottom period.
C. They are in the rightmost column.
D. They are to the left of the zigzag line.

Which of the following explains a difference between genes and chromosomes

Which of the following is NOT a chemical change?
A. Tarnishing silver
B. Melting butter
C. Digesting food
D. Baking a cake

3.2 g of a gas at occupy the same volume as 0.6266 g of CH4 at 17°C at constant pressure
Find the molecular mass of the gas.​

162.4 NH3 =____mol NH3

Symptoms of a mental disorder are ways of
unusual.
feeling, or acting that are
A. thinking
B. sleeping
C. working
D. imaging

Help me real quick !!

A particular state of matter has atoms that are packed closely together and vibrating in fixed positions. A phase change occurs and the matter changes to a state where the atoms are spaced far apart and are moving about randomly. What can you infer has occurred?

Which is one of the reactants in Reaction A?

Group of answer choices

copper

water

silver

sodium

Which equation is balanced?

Al+3O2→Al2O3

2Al+3F2→2AlF3

Na+F2→2NaF

Mg+2O2→2MgO

Which statement best describes physical properties?
A. Physical properties behave identically for all matter under the same conditions.
B. Physical properties can be observed without changing the identity of a substance. C. Physical properties are observed by seeing how a substance reacts with other substances.
D. Physical properties cause atoms and molecules to change structure when substances are mixed.

According to the cup wall diagrams, why does the double wall vacuum
sealed cup outperform the other two cups
Because the particles are moving so fast in a vacuum that
they are able to pass through the walls and transfer more
kinetic energy to the liquid in the cup.
B
The vacuum allows for the all of the particles to pack in tightly
therefore nothing can pass through.
There is little to no transfer of kinetic energy between the
walls of the cups because there are no particles in a vacuum.
And since there is little to no transfer of kinetic energy there
is little to no transfer of temperature. Therefore the liquid
inside stays warmer/colder longer.
The particles in a vacuum do not move at all. Therefore there
is no kinetic energy and nothing can be transferred.

Why must the final product of a decay series be stable?

a. The daughter isotope of any radioactive decay is stable.
b. No decay chain can emit more than two particles.
c. Each decay results in a net loss of particles.
d. If the daughter isotope is unstable, it will decay.

The daily rotation of Earth causes ______ and _____. *

High Tide
Low Tides
Day
Night
Spring Tide
Neap Tide


Really need this!! for a big grade! thank you guys ~ please help!

Is it possible to have more atoms on the product side of a chemical reaction than there are on the reactant side? Explain why or why not.

How many atoms of hydrogen appear to be on the reactant side?

What is the main characteristic of altruistic love? A. admiration B. unconditional love C. passion D. tenderness

ASAP!! Which one of the following substances can be produced during an acid-base neutralization reaction?
A. Al(OH)3
B. HCl
C. H2O2
D. MgBr2

How many bonds and lone pairs are in the molecule SIH4?
A.2 bonds, 2 lone pairs
B.4 bonds, 4 lone pairs
C.no bonds, 4 lone pairs
D.4 bonds, no lone pairs

The compound Mg(OH)2 is incorrectly named magnesium dihydroxide.
Explain the errors)