PLEASE I NEED HELP!!!Using the table below, identify the unknown material that has a mass of 15,06 g and a
volume of 0.78 mL.
Substance Density (g/cm) Substance
Ice (0°C) 0.917 Human fat
Water (4.0°C) 1.0000 Cork
Gold
1931
Table sugar
Helium (25°C)
0.000 164 Balsa wood
Air (25°C) 0.001 185 Earth
Density (g/cm)
0.94
0.22-0.26
159
0.12
554
Ice
Water
Gold
Helium
O Air

The number of phosphorus atoms : 2.408 x 10²⁴

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

moles of Mg₃(PO₄)₂ = 2

moles of phosphorous(P) atoms in Mg₃(PO₄)₂ ⇒ mol ratio of elements in the compound(for P=2)

[tex]\tt 2\times 2=4[/tex]

The number of atoms of  phosphorous(P) :

[tex]\tt 4\times 6.02\times 10^{23}=2.408\times 10^{24}[/tex]

Explanation:

Chemistry, however, plays the primary role in materials science because it provides information about the structure and composition of materials. Materials scientists study the structures and chemical properties of various materials to develop new products or enhance existing ones.

Answer:

the other person is right.

Explanation:

Answer:

I think it's d but I'm not positive

Answer:

A

Explanation:

Answer:

Kinetic energy increases.

Explanation:

Kinetic energy is energy you get from moving. The equation for KE depends on mass as well as velocity. If you increase one of these factors, KE will increase too.

Answer:

Helium will heat up the fastest

Explanation:

If you then increase the intensity of the 4.5 eV light, you will notice that the photons would come off at higher speeds.

Light intensity refers to the strength or amount of light produced by a specific lamp source.

Intensity of light measures of the wavelength-weighted power emitted by a light source.

Mathematically, the intensity of light source is given as;

I = P/A

where;

Increasing the light intensity (photon energy per second per unit area) increases the rate at which electrons leave the metal, and the electrons have more kinetic energy.

Thus,  if you then increase the intensity of the 4.5 eV light, you will notice that the photons would come off at higher speeds.

Learn more about intensity of light here: https://brainly.com/question/28145811

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Answer:

13.4mol of Mg

Explanation:

Given parameters:

Mass of magnesium = 321g

Unknown:

Number of moles  = ?

Solution:

The number of moles of a substance is given as;

  Number of moles  = [tex]\frac{mass}{molar mass}[/tex]  

 Molar mass of Mg = 24g/mol

 Insert the parameters and solve;

        Number of moles  = [tex]\frac{321}{24}[/tex]   = 13.4mol of Mg

Answer:

Ionic compounds contains ionic bond

Like NaCl

Molecular compounds contains covalent bond like H2O

And metals contains metalic bond like in copper

Explanation:

Answer:

Mass = 331.17 g

Explanation:

Given data:

Mass in gram = ?

Number of atoms of K₂SO₄ = 1.18 × 10²⁴ atoms

Solution:

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

1.18 × 10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms

0.19× 10¹ mol

1.9 mol

Mass of K₂SO₄:

Mass = number of moles × molar mass

Mass = 1.9 mol × 174.3 g/mol

Mass = 331.17 g

Answer:

Elements are all the subtances on the periodic table. Compound are elements that are fused by chemical means like potassium chloride. Mixture are elements that are not chemically fused but just in a sense mixed together.

Answer:

To make both sides of an equation equal, multiply the number of atoms in each element until both sides are equal.

Explanation:

The chemical equation is an equation in which the number of atoms of each element on the product side is equal to the number of atoms of each element on the reactant side. To make both sides of an equation equal, multiply the number of atoms in each of the elements on both the sides until both the sides become equal.

The famous formula E=mc^2 really says that mass and energy are the same thing, but measured in different units. So the separate laws of conservation- one for mass and the other for energy- are now merged into one law.

Einstein's theory of special relativity (1905) shows that matter (as mass) and energy can be converted into each other according to the famous equation E = mc2, where E is energy, m is mass, and c is the speed of light.

Hope It helps you.

Answer:

it might be the second answer

Answer:

Try doing this: 50.7/.9327 for the answer.

Answer: Frost weathering is a collective term for several mechanical weathering processes induced by stresses created by the freezing of water into ice.

Answer:Density is directly proportional to pressure and indirectly proportional to temperature. As pressure increases, with temperature constant, density increases. Conversely when temperature increases, with pressure constant, density decreases.

Explanation:

hope this helped

Answer: number 9 is: Measurements are fundamental to experimental science. Number 10 is: To evaluate the accuracy of a measurement, the measured value must be compared to the correct value. To evaluate the precision of a measurement, you must compare the values of two or more repeated measurements. Number 11 is: Measurements must always be reported to the correct number of significant figures because calculated answers often depend on the number of significant figures in the values used in the calculation. Number 12 is: Usually a calculated answer cannot be more precise than the least precise measurement from which it was calculated. Number 13 is: 125.7−124.1=1.6 125.7 − 124.1 = 1.6 degrees Celsius. Number 14 is: a. 11 soccer players- 2 SF b. 0.070 020 meter- 5 SF c. 10,800 meters- 5 SF

d. 5.00 cubic meters- 1 SF.

Number 15 is: A)

Number of significant figures = 2

B)

Number of significant figures = 2

C).

Number of significant figures = 1

D).

Number of significant figures = 3

E).

Number of significant figures = 3

Explanation:

Answer:

Oxygen is denser

Explanation:

Oxygen is denser than both air and nitrogen, at all temperatures and pressures, but only slightly. Since they don't separate from each other, we generally don't worry which is lighter or heavier. The difference in the density of nitrogen and oxygen gas comes from their molecular weight, which is small (4 g/mol)

Answer:

Oxygen is denser than air.

Explanation:

This is because oxygen gas comes from its molecular weight. Also air is mainly made up of nitrogen and nitrogen is lighter than oxygen.

"The number of electrons / charge of each ion tells about the property of the rection either it is single replacement reaction or double replacement reaction."

What is replacement reaction?

Replacement reactions are extremely significant chemistry phenomena. They are employed in a variety of fields. For example, it can employ electroplating, that is reliant on replacement reaction, to keep iron objects from rusting.

To know more about replacement reactions click here.

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Answer:

B: 2 moles

Explanation:

that my answer I got i think its correct

Answer:

CCI2

Explanation:

Answer:

ITS A OR B

Explanation:

Answer: P represents electrical energy, Q represents thermal energy.

Explanation: The toaster takes electrical energy from the electrical socket through wires and converts that into thermal energy that heats up/toasts the bread.

Answer:

P represents electrical energy, Q represents thermal energy

Explanation:

I am sorry if I get this wrong, but when I put it in the sentence - A toaster transforms electrical energy into thermal energy - it made sense to me, so I think that is the answer. I am sorry if this does not help.

Answer:

Xenon

Explanation:

The reason is because, Xenon is a part of a Group on the periodic table called Noble Gases. This means that it has 8 electrons on its outer shell, making it very hard to get a reaction out of it.

Answer:

Q = 43,000 calories = 180,000 joules = 180 Kilojoules

Explanation:

Heat flow for phase change can be defined as Q = m·ΔHv  

ΔHv = Heat of Vaporization for water = 540 calories/gram = 2259 joules/gram = 2.259 Kilojoules/gram

m = mass of object of interest ( in this problem 80 grams steam 100°C converting to 80 grams of water at 100°C

Q = m·ΔHv = 80g x 540 cals/g =43.200 calories x 4.184 joules/cal = 180,748.8 joules (calculator answer) => 180,000 joules (2 sig. figs.) = 180 Kj