7. The percentage, by mass, of phosphorus in
calcium phosphate Ca3(PO4)2 is
(Ca=40, P=31, O=16)
(2 Points)
8%
10%
17%
20%​

Answers

Answer 1

Answer:

I am pretty sure that the answer is 20%


Related Questions

Directions: Read through each scenario and identify the independent variable, dependent variable, and the control.

Question 1

1 pts

Rob is in charge of waxing the floor at the local mall. He wants to test a new brand of floor wax called

Squeaky Clean. Rob waxes 20 floor tiles with Squeaky Clean and 20 tiles with the original wax brand.

After one week he counts the number of scratches on the floor. What is the independent variable?

number of floor scratches

brand of floor wax

20 tiles with original brand wax

Answers

Answer:

The correct answer is - brand of floor wax.

Explanation:

The independent variable is the variable or the factor in an investigation which is manipulated or change in the experiment and affects the dependent variable and produces a various result.

In this investigation, there are different brands of the floor was are the independent variable as they are changed to see the effect on the scratches on the floor on 20 tiles for each brand.

Here is the electron configuration for Argon. What does the coefficient 3 in 3s2 tell us?

Ar: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

Answers

The coefficient 3 represents the electron shell

Further explanation  

In an atom there are levels of energy in the shell and sub shell  

This energy level is expressed in the form of electron configurations.  

Writing electron configurations starts from the lowest to the highest sub-shell energy level. There are 4 sub-shells in the shell of an atom, namely s, p, d and f. The maximum number of electrons for each sub shell is  

• s: 2 electrons  

• p: 6 electrons  

• d: 10 electrons and  

• f: 14 electrons  

Charging electrons in the sub shell uses the following sequence:  

1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d¹⁰, 4p⁶, 5s², 4d¹⁰, 5p⁶, 6s², etc.  

Argon is a noble gas element with the symbol Ar with atomic number 18 and mass number 40

Electron configuration: [Ne] 3s²3p⁶

The coefficient 3 represents the electron shell, which is denoted as the quantum number n

This shell consists of 3 sub shells namely 3s, 3p and 3d which have a maximum of 18 electrons (3s = 2 electrons, 3p = 6 electrons and 3d = 10 electrons)

can someone help me please i’ll give brainly

Answers

Physical change, and chemical change

The tundra is characterized by _____.

extremely cold temperatures
high rainfall
long growing seasons
high temperatures

Answers

extremely cold temperatures

Answer:

Tundra are cold bioms. They include poler bears wolfs rabbits etc

Explanation:

In a warehouse, the workers sometimes slide boxes along the floor to move them. Two boxes were sliding toward each other and crashed. The crash caused both boxes to change speed. Based on the information in the diagram, which statement is correct? In your answer, explain what the forces were like and why the boxes changed speed.Box 1 has more mass than Box 2. Box 1 and Box 2 are the same mass. Box 1 has less mass than Box 2

Answers

Answer:

There is no friction because of the mass.

Explanation:

The bigger box ran out of force to move so it hit the smaller box. (im in 7th grade and have the answer key)

Easy Chemistry/ Help

Answers

i’m not really sure what the qn is asking for but if i’m not wrong it should be ‘1’ for each blank!

Help please its science

Answers

Answer: any answer choices

Explanation:

mark all the things that can be chnaged about a chemical equation when it is being balanced ​

Answers

Answer:

a and b

Explanation:

The mass of an object can vary with the object’s location true or false

Answers

Answer:

true

Explanation:

I just did it

I will give brainiest how does a orange get its color

Answers

Answer:

by mixing red and yellow

Explanation:

Answer:

Either the sun or by mixing red and yellow together because they make orange.

Explanation:

Brainliest pls

Which statement is a testable hypothesis?
A. Beans are the best plants to use in a science fair experiment.
B. Watering bean plants with salt water will make them grow faster.
C. Bean plants will become extinct before corn plants do.
D. Everyone can grow beans given the right instructions.
please help. i’ll give brainliest if ur answer is correct

Answers

Answer:

b

Explanation:

I think B because its saying that perhaps watering with salt water would make them grow faster, you don't know yet unless tested.

How did the substance oxygen change the world??

Answers

Answer: The atmosphere of Earth wasn't always full of oxygen. ... An accidental mutation would some day change the world forever as these organisms would become able to feed off of the sunlight around them, and produce oxygen in a process known as photosynthesis. This oxygen, which none of these organisms could use, was toxic.

BRAINLEST WILL BE GIVEN TO A RIGHT ANSWER!!!!

Potassium (K) has a charge of +1, and sulfur has a charge of –2. Which best describes the compound they make?

A) The chemical formula is K2S, and the name is potassium sulfide.

B) The chemical formula is KS2, and the name is potassium sulfide.

C) The chemical formula is K2S, and the name is sulfur potassium.

D) The chemical formula is KS2, and the name is sulfur potassium.

Answers

Answer:

A) The chemical formula is K2S, and the name is potassium sulfide. Explanation:

edge

What igneous rock is non-vesicular and glassy in texture and has a mafic composition?

Answers

Answer:

igneous rock

Explanation:

6H2 represents how many atoms of hydrogen?

Answers

Answer:

i think its 12, but i'm not 100% sure

Explanation:

how is a solute and a solvent different

Answers

Solute is substance which is dissolve in a solvent and Solvent is a substance that dissolves solute in a solution.
Answer: Solute is the substance being dissolved, and solvent is the substance that the solute is dissolving in. For example, 1 g of sugar in 100 mL of water. Sugar is being solved so it is the solute, and water is what the sugar is dissolving in so it is the solvent.

PLEASE HELP MEEE!!!!!!!!!

Answers

Work completed : 15 J

Further explanation

Work is the transfer of energy caused by the force acting on a moving object  

Work is the product of force with the displacement of objects.  

Can be formulated  

W = F x d  

W = Work, J, Nm  

F = Force, N  

d = distance, m  

Force=F= 5 N

Distance=d=3 m

Work :

[tex]\tt W=5\times 3\\\\W=15~J[/tex]

Which states of matter can form solutions?
A. Gas-liquid
B. Solid-solid
C. Solid-liquid
D. All of the above

Answers

Answer:

c

Explanation:

spongebob cheese pants

Answer:

I believe D

Explanation:

im not super sure but I'm pretttyyy sure

Is it necessary to prepare sodium extract to detect nitrogen in urea ?​

Answers

Answer:

I think No

Explanation:

Helpppppoop. Question 6 of 10
Which term best describes the state of matter modeled in the beaker?
A. Disorganized
B. Amorphous
C. Liquid
D. Solid

Answers

D solid





Ok there you go

Answer:D. Solid

Explanation:

A. Disorganized

B. Amorphous

C. Liquid

D. Solid

1.) Fluorite has a glassy luster and a white streak. It's an inorganic solid with a chemical formula of CaF2 CaF2
A: It is inorganic
B: It is a solid
C. It can be defined by a chemical formula
D. All of the above

Answers

Answer:

D. All of the above

Fluorite is inorganic solid and can be defined by its chemical formula. Thus option D is correct.

What is chemical formula?

Chemical formula is defined as a chemical elements numbers and symbols are used to provide information about the chemical quantities of atoms that make up a certain chemical compound or molecule.

It is also defined as any of numerous statements of a chemical compound's content or structure.

There are mainly three types of chemical formulas.

Empirical formulaMolecular formulaStructural formula

Thus, fluorite is inorganic solid and can be defined by its chemical formula. Thus option D is correct.

To learn more about chemical formula, refer to the link below:

https://brainly.com/question/11995171

#SPJ5

How many moles are in 640.00 grams of Glucose (C6H1206)?
Express your answer rounded to 2 decimal places

Answers

Answer:

3.56 moles

Explanation:

The number of moles of glucose can be found by using the formula

[tex]n = \frac{m}{M} \\ [/tex]

where

n is the number of moles

M is the molar mass

m is the mass of the substance

First we must find the molar mass of glucose

[tex]M(C) = 12 , \: \: \: M( H_2) = 1 \: \: , \: \: M(O_2) = 16 \\ [/tex]

The molar mass of glucose is

[tex]M(C_6H_{12}O_6) = (12 \times 6) + 12 + (16 \times 6) \\ = 72 + 12 + 96 \\ \\ = 180 \: \: g/mol \: \: \: [/tex]

mass = 640 g

So we have

[tex]n = \frac{640}{180} = \frac{64}{18} = \frac{32}{9} \\ = 3.5555..[/tex]

We have the final answer as

3.56 moles to 2 decimal places

Hope this helps you

BRAINLIEST

What is kinetic energy? Give an example of kinetic energy.

Answers

Kinetic energy is is the energy of mass in motion basically the kinetic energy of an object is the energy it has because of its motion an example of kinetic energy would be, well let’s say you have a ball and you let that ball fall the potential energy then converts into kinetic energy or the energy associated with the motion and there are five types of kinetic energy like (radiant and thermal and sound and electrical and mechanical! Hopefully this help!

energy which a body possess by virtue of being in motion

ex: a river flowing at a certain speed comprises kinetic energy as water has a certain velocity and mass

Select the conditions that are required for the formation of hurricanes. (Choose 3)
A: cold,cyclonic wind
B: deep ocean water
C: cold ocean water
D: warm,humid wind
E: warm ocean water
F: a strong cold front​

Answers

Answer:  

A: cold, cyclonic wind

B: deep ocean water

C: cold ocean water

E: warm ocean water

F: a strong cold front​

You only need A, B, C, E, F not D because that for tornadoes buddy.

Antacids relif hyperacidity. why? plz help me!!!!​

Answers

Antacid is a substance which neutralizes excess acid secreted by the stomach.So by using it ,it will neuralize the excess acidity and prevents heart burns etc.

Which of these is not true about weight

A:it is measurement of how heavy an object is

B:it is always the same mass,regardless of gravity

C:it is affected by objects mass and the force of gravity

D:it’s is commonly measured in pounds

Answers

Answer:

its b beacuse different things have different mass


(ii) I cannot make the payment today.
(Use 'made' without changing the tense)

Answers

Answer:

I made the payment today.

Explanation:

During which change of state would the volume of a substance increase the most?

deposition
melting
vaporization
sublimation

Help me plz!

Answers

Answer:

Gas/vaporization

Explanation:

The most stare has the high volume is the gas state. So the answer is between vaporization and sublimation

Answer:

Submilation

Explanation:

Please help me how do i solve this

Answers

Answer:120

Explanation:2gfdxxfgngfnf

suppose that you are comparing several objects. is it correct to say that the object with the largest volume has the largest mass? explain your reasoning, and include an example. help!! asap!!

Answers

Answer:

No

Explanation:

It is not correct to say that an object with the largest volume has the largest mass.

Mass and volume are not directly related. In fact, the relationship between them can be direct or inverse.

Mass is the amount of matter in a substance. Volume is the space a body occupies.

A balloon and a stone for example is a typical one. A balloon has more volume but far lesser mass compared to a stone. A stone, gravel sized has low volume but more massive than a balloon.

Therefore, it is wrong to say a balloon has more mass because it has more volume.

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