Can someone please help me? :(

Answer:

D

Explanation:

A: not true. You could have cement floors and still receive radio/TV

B: not true. Very little of the waves are absorbed by the walls.

C: not true. You can receive radio/TV if there isn't a carpet in the entire house.

D: Dis the answer. Walls don't absorb the incoming waves or not much of them

Answer:

1= simple distillation

2 - elements contain just one type of atom ; compounds contain atoms of at least two different elements , which have been chemically combined or bonded

Explanation:

hope this helps

Answer:

chromotragraphy

because it has mixture of compounds and elements

i think these are the answers

Explanation:

Answer:

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.

Answer:

protons

Explanation:

have a positive charge

Answer:

Protons!

Explanation:

Protons are positve! Protons start with P, and Positive starts with P. This is a very handy trick!

For 12.09 kcal of energy, added to 45 grams of water at an initial temperature of 23.4°C, the final temperature of the water is mathematically given as

T2=290C

Generally, the equation for the Energy  is mathematically given as

Q=mcdT

Therefore

Q=mcdT

12.09=45*(23.4-T2)

T2=290C

In conclusion,  the final temperature is

T2=290C

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Answer:

[tex]\huge\boxed{\sf 1.51\ L}[/tex]

Explanation:

From the reaction:

2 moles of Na produce 1 mole of H₂

Converting 3.10 g of Na into moles:

Moles = mass / molar mass

= 3.10 / 23

= 0.135 mol

From the reaction:

2 Na = 1 H₂

1 Na = 1/2 H₂

1 Na = 0.5 H₂

1 mol of Na = 0.5 mol of H₂

0.135 mol of Na = 0.5 × 0.135 mol of H₂

0.135 mol of Na = 0.067 mol of H₂

So, 0.135 mol of Na (3.10 g) produce 0.067 mol of H₂

Convert 0.067 mol of H₂ into L:

= mol × molar value

[molar value = 22.4 L/mol]

= 0.067 × 22.4

= 1.51 L

[tex]\rule[225]{225}{2}[/tex]

The size of volumetric flask that would be useful in diluting 100 ml of a 3.0 M solution of sucrose to make a 0.60M solution is 500mL.

The volume of a solution can be calculated by using the following expression;

C1V1 = C2V2

Where;

3 × 100 = V2 × 0.60

300 = 0.6V2

V2 = 300 ÷ 0.6

V2 = 500mL

Therefore, the size of volumetric flask that would be useful in diluting 100 ml of a 3.0 M solution of sucrose to make a 0.60M solution is 500mL.

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Answer:

DNA is made up of two strands of nucleotides. The nucleotides are made up of a sugar (deoxyribose in DNA), a phosphate, and a nitrogen base. The sugars and phosphates make up the "handrails" (or "backbone"), and are held together by covalent bonds.

Explanation:

Answer:

The volume of basketball is  7216.5 cm³.

Explanation:

Given data:

Radius of ball = 12 cm

Volume of ball = ?

Solution:

We will apply the volume formula of sphere.

V = 4/3 ×π×r³

we know that,

π = 22/7

r = 12 cm

Now we will put the values in formula.

V = 4/3 × 3.14 × (12 cm)³

V =  4/3 × 3.14 ×1728 cm³

V = 7216.5  cm³

Thus, the volume of basketball is  7216.5  cm³.

Absorbing light and through collisions

As the mass of an object increases, its acceleration decreases. Acceleration is inversely proportional to mass.

Answer:

The answer is species diversity

Explanation:

Hope this helps:)......if not then sorry for wasting your time and may God bless you:)

Answer:

isn't diamond made from black coal? haha... just kidding. se the answer below

Explanation:

Diamond is a rare, naturally occurring mineral composed of carbon. Each carbon atom in a diamond is surrounded by four other carbon atoms and connected to them by strong covalent bonds - the strongest type of chemical bond.Diamond is the hardest known natural substance.

I hope I helped.

Answer:

see answer below

Explanation:

LOL idk what this question is about but to my understanding, having a detailed procedure gives u more clue on what u r doing and how u r doing it. think of this like a instruction manual, if u want to build a telescope and have no idea how to build it and the instrutions only give u short sentences like"screw nails next to the finger scope" or something like that wouldnt help much. i dont know about u but i rather prefer instructions written like this"first screw the nail beside the finger scope, DO NOT unscrew the botton" and continue. i cant build a telescope so yea dont know any directions to that.

Answer:

led

Explanation:

Paint is kind of synthetic chemical product.

Paint is any colored liquid, liquefiable, or solid mastic substance that solidifies after being applied in a thin layer to a substrate.

Pigments, binders, solvents, and additives are the four major components of all paints. Binders work to "bind" the pigments together and create the paint film, while pigments offer color and conceal. Additives are substances that give certain paint features such as mildew resistance, while solvents are liquids that suspend the components and allow you to deposit the paint on the surfaces. All four elements work together to create paint that is tailored to your exact design requirements.

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Answer:

The greater Earth's axial tilt angle, the more extreme our seasons are, as each hemisphere receives more solar radiation during its summer

Explanation:

Answer:

Explanation:not

Explanation:

As the temperature increases, the average kinetic energy increases as does the velocity of the gas particles hitting the walls of the container. The force exerted by the particles per unit of area on the container is the pressure, so as the temperature increases the pressure must also increase.

For example, if an engineer has to store 600g of oxygen in a container and that oxygen needs to be kept at a pressure of 1 atm and a temperature of 125 degrees Fahrenheit, then this theorem (which is called Ideal Gas Law) is used to figure out what volume of a container needs to be built.

Answer:

do good

Explanation:

do good

Answer:

A simple way of detecting the smell of the ester is to pour the mixture into some water in a small beaker. Esters are virtually insoluble in water and tend to form a thin layer on the surface. Excess acid and alcohol both dissolve and are tucked safely away under the ester laye

Answer:

100 grams

Explanation:

Answer:

for the force that sent the person forward, there is an equal force pushing back on the skateboard

Answer:

The answer is C. Inversely, when this atom gains a positively charged ion. (The atom) becomes a negatively charged atom or an "anion".

Explanation:

Since electrons are negatively charged, an atom that loses one or more electrons will become positively charged, an atom that gains one or more electrons becomes negatively charged. The oppositely charged ions attract each other to form ionic networks (or lattices)

Answer:

opposite charges attract

Explanation: Ionic bonding is the attraction between positive and negative charge ions electrostatics explains why this happens: opposite charges attract and like charges repel. when many ions attract each other, they form large, ordered, crystal lattices in which each ion is surrounded by ions of the opposite charge. Happy to help my friend

Answer:

true

Explanation:

what is substance take change everything changes

Answer:  see below

Explanation:

Zeros between the digit and decimal point are NOT significant.

Zeros between digits ARE significant.

a. 230 mL.              sf: 23

b. 0.00540 s          sf: 540

c. 1440                    sf: 144

d. 50 ℃                  sf: 5

e. 0.9405 g/cm3    sf: 9405

f. 700 jellybeans    sf: 7

g. 1.05 x 10⁶            sf: 105

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question

mass = 31 g

density = 444 g/mL

We have

[tex]volume = \frac{31}{444} \\ = 0.06981...[/tex]

We have the final answer as

Hope this helps you

Answer:

Relative and average atomic mass both describe properties of an element related to its different isotopes.

Explanation:However, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate.

Mass defines the quantity of a substance. It is measured in gram or kilogram.  Average mass is the mass of atoms of an element that are isotopes.  It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

The relative mass is the mass that is with respect to mass of a matter that is considered as standard. In chemistry relative mass is equal to the mass of one-twelfth the mass of [tex]C-12[/tex] isotope .

Out of relative and average atomic mass, relative atomic mass is more accurate as it is calculated with respect to a standard quantity.

Thus Relative atomic mass is more accurate than average atomic mass.

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Relative and average atomic mass both describe properties of an element related to its different isotopes.

Explanation: However, relative atomic mass is a standardized number that's assumed to be correct under most circumstances, while average atomic mass is only true for a specific sample.

Explanation:

manganese(11)

chloride =color pink

tetrahydate

copper(11)

chloride =color blue green

dihydrate

nickel(11)

chloride =color green

hexahydrate

Answer:

Explanation:

Iron(II) sulphate crystals are green.

Solid Ferric, ( Fe(III) chloride is brown.

Copper Sulphate is blue.

Calcium Sulphate is white.

Barium Sulphate is white.