Which of the following materials are least porous?

Loosely packed gravel

sorted sand and rock

unsorted sand and rock

large pebbles and boulders

Answer:

c they are all made of cells

Explanation:

that's the only similarity

Answer: The nucleus is often referred to as the control center, or brain, of the cell and contains the DNA, or genetic material. The nucleus is surrounded by the nuclear envelope. ... Human cells are eukaryotic cells.

Explanation:

Answer:

Nucleus

Explanation:

not to good at explaining but I'm hoping this is right!

Answer:

B) C3H3O and C6H6O2

Explanation:

Given data:

Molar mass of compound = 100 g/mol

Percentage of hydrogen = 5.45%

Percentage of carbon = 65.45%

Percentage of oxygen = 29.09%

Empirical formula = ?

Molecular formula = ?

Solution:

Number of gram atoms of H = 5.45 / 1.01 = 5.4

Number of gram atoms of O = 29.09/ 16 = 1.8

Number of gram atoms of C = 65.45 / 12 = 5.5

Atomic ratio:

            C                      :      H            :         O

           5.5/1.8              :     5.4/1.8     :        1.8/1.8

            3                      :        3          :        1

C : H : O = 3 : 3 : 1

Empirical formula is C₃H₃O.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = 12×3 + 1.01 ×3 + 16×1 = 55.03  

n = 100 / 5503

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₃H₃O)

Molecular formula = C₆H₆O₂

Answer:

Question:

A spring with a spring constant of 30 N/m is stretched 0.2 m from its equilibrium position. How much work must be done to stretch it an additional 0.1 m?

Elastic Potential Energy:

The work that needs to be done by any object is a form of energy. The work can be defined in terms of the work-energy theorem, which states that the work can either be the difference in the kinetic energy of a system or the difference in the potential energy of a system. There is a special type of potential energy reserved exclusively for

Answer:

Always be scared of electroplating. ...

Follow all electrical safety precautions. ...

Use all safety Precautions. ...

Use that Fume Hood. ...

It's a chemistry lab, set it up like one. ...

Always add acid to water. ...

Don't overheat your solutions! ...

Don't mix acid and cyanide solutions.

Answer:

Explanation:

mass of one atom of helium-4 is one-third the mass of one atom of carbon-12. You can find ... mass He. 1 mole He. 4.00 g He. -= 0.366 g He. 0.0914 mothé x 1 motte. Helium ... How many moles of oxygen atoms are present in 5.00 mol diphos-.

Answer:

it's the electron cloud model

Answer:

the periodic table is important because it is organized to provide a alot of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.

Explanation:

Answer:

Multicellular organisms have cells that are organized in specific ways to perform specialized functions. From the most complex level to the simplest level, the five levels of organization for the sheep should be ordered as:

whole organism → organ system → organ → tissue→ cell

Explanation:

Answer:

9.5 m

Explanation:

First, divide 4.75 m by the 0.50 l

4.75/0.50

This leaves you with 9.5 m

Answer: 80

Explanation:

12+6+1+1=20

20x4=80

Answer:

The chemical at the heart of the air bag reaction is called sodium azide, or NaN3. CRASHES trip sensors in cars that send an electric signal to an ignitor. The heat generated causes sodium azide to decompose into sodium metal and nitrogen gas, which inflates the car's air bags

Explanation:

B. The partial pressure of N2 is 101 kPa

Given

volume = 22.4 L

1.0 mol of nitrogen and 2.0 mol of hydrogen at 0°C

Required

Total pressure and partial pressure

Solution

Ideal gas law :

PV = nRT

n total = 3 mol

T = O °C + 273 = 273 K

P = nRT/V

P = 3 x 0.08205 x 273 / 22.4

P total = 3 atm = 303,975 kPa

P Nitrogen = 1/3 x 303.975 = 101.325 kPa

P Hydrogen = 2/3 x 303.975 = 202.65 kPa

Answer:The partial pressure of N2 is 101 kPa

Explanation:

Answer:

yes

Explanation:

the polyatomic ion is acetate, C2H3O2

Answer: 8 Moles of Oxygen

Explanation: The formula shows that there are (exactly) 4 oxygen atoms in each mole or formula unit. Therefore 4 * 2.00 = 8.

Answer:

The answer is C: “sunlight in deeper locations decrease”

Explanation:

C is the answer because the more salinity water has.. the harder it is to see and the harder it is for light to travel through the ocean.

Answer:

c

Explanation:

Answer:

3

Explanation:

From the table below we see that we can have three possible orbitals when l = 1. These are designated as p orbitals and have a sort of 8 shapes. Each of the p orbitals has a different orientation in three-dimensional space.

Answer:

Carbon dioxide

Explanation:

that's all I can say

120 g CO₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

[Given] 150 g O₂

Step 2: Identify Conversions

[RxN] 5 mol O₂ → 3 mol CO₂

[PT] Molar Mass of O - 16.00 g/mol

[PT] Molar Mass of C - 12.01 g/mol

Molar Mass of O₂ - 2(16.00) = 32.00 g/mol

Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol

Step 3: Stoich

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

123.778 g CO₂ ≈ 120 g CO₂

Answer:

Pure Water.

Explanation:

Pure water evaporates faster than salt water.

Answer:

C. 5 inches

Explanation:

don't worried, i learned that from my teacher

Answer:

The answer is 25.14 percent. Hope this helps.

Answer:

1. definition of a problem

2.solution to the problem

3.the result

Explanation:

Hope this helps

The three (3) must haves of a hypothesis include the following;

A hypothesis can be defined as a testable explanation for an  observation or a scientific problem. Thus, a hypothesis is a type of statement that is typically considered to be either tentative or an educated guess.

An example of a hypothesis is saying;

Generally, the three (3) must haves of a hypothesis include the following;

1. A hypothesis must be tested and falsifiable.

2. A hypothesis must be supported by an observation and results of control experiments.

3. A hypothesis must proffer a solution to a problem.

Find more information: https://brainly.com/question/21053600

Answer:

thanks to all the mortal those who are born must die one day that it cut in cannot be avoided as ripe fruit fall of the tree so it is common to all the mortal those who are born must die one day that it cut

Explanation:

silghjnb bj i bb b nv bv hc U and lamenting produce a few of the tree so much for your time is common to both of us ☺️ to all the said that death of the tree so it cut in cannot be avoided as well as well but the mortal Kombat X the said

Answer:

13.25 ×10²³ atoms

Explanation:

Given data:

Mass of NaCl = 128 g

Number of atoms = ?

Solution:

First of all we will calculate the number of moles of NaCl.

Number of moles = mass/molar mass

Number of moles = 128 g/ 58.4 g/mol

Number of moles = 2.2 mol

Number of atoms:

1 mole of any substance contain 6.022×10²³ atoms.

2.2 mol × 6.022×10²³ atoms / 1mol

13.25 ×10²³ atoms

95.21 g/mol

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Identify

MgCl₂

Step 2: Find Formula Weight

[PT] Molar Mass of Mg - 24.31 g/mol

[PT] Molar Mass of Cl - 35.45 g/mol

Molar Mass of MgCl₂ - 24.31 + 2(35.45) = 95.21 g/mol

Answer:energy is emitted as electromagnetic radiy

Explanation:

Answer:

Mercury

Explanation: Under standard conditions mercury is a shiny, heavy, silvery liquid. It is the only metal that is liquid at room temperature.

Answer:

Mercury, Venus, earth and mar, Jupiter, Saturn, urines, Neptune.

Explanation: