What does percent composition tell you about a substance?
O
A. It gives you the molecular formula of the substance,
B. It tells you what the substance is made of
O C. It gives you the total mass of the substance,
OD. It tells you how many moles are in the substance,

Answer:

2 combustion

3 combustion

4 decomposition

5 replacement

6 Decomposition

Note:

Im not really sure if those r right.

It may be right actually.

To solve such this we must know the concept of chemical reaction. Therefore, the type of reaction can be given as below. To know the type of reaction we must balance the reaction first.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

balanced equation         types of chemical reaction.

Ca(OH)[tex]_2[/tex]  [tex]\rightarrow[/tex]CaO + H[tex]_2[/tex]O     decomposition

MgO + H2O [tex]\rightarrow[/tex] Mg(OH)[tex]_2[/tex]  combination

CH[tex]_4[/tex]+ 2O[tex]_2[/tex]  [tex]\rightarrow[/tex]CO[tex]_2[/tex] + 2H[tex]_2[/tex]O  combustion

KCIO[tex]_3[/tex] [tex]\rightarrow[/tex]2KCI+ 3O[tex]_2[/tex]            decomposition

NH[tex]_3[/tex] + H[tex]_2[/tex]O[tex]\rightarrow[/tex] NH [tex]_4[/tex]OH        combination

Zn + 2HCI [tex]\rightarrow[/tex]ZnCl[tex]_2[/tex] + H[tex]_2[/tex]      displacement

Therefore, the type of reaction can be given as above.

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Answer:

84130.44698 and 8.413044698*10^4

Explanation:

Answer:

2:8

Explanation:

The reaction equation is a given as:

         2C₄H₁₀   +    130₂   →    8CO₂     +     10H₂O  

From the reaction equation, the mole ratio is 2:8

Butane is C₄H₁₀

Carbon dioxide CO₂

From the reaction;

       2 moles of butane will produce 8 moles of carbon dioxide

Answer:

A) 2:8

Explanation:

Took the quiz and was right

Answer:

true and b are the answers I think

Answer:

true/precipitation

Explanation:

Answer:

Mg2+

Explanation:

The most reactive ions from the given choices is the magnesium ion. This is because it is higher in the activity series of metals.

Zinc ion is below this specie in the activity series.

As a rule, ions above another on the activity series are generally more reactive than those below.

From any solution, magnesium ion will displace the zinc ion in such process.

The position of metallic ions determines their reactivity.

Answer:

haha

Explanation:

yea because my phat a22 is to lazy

Answer: Hydrogen - 18.286%( mass present)

              Carbon - 81.714%(mass present)

Explanation:

Mass percentage does not have any unit as numerator and denominator contains the same unit. Therefore, the percent composition of C and H in C[tex]_3[/tex]H[tex]_8[/tex] is 81.8% and 18% respectively.

Mass percentage represents the the percentage of each element that is making a particular compound.

Mathematically,

Percentage of mass = (component’s mass ÷ total mass) x 100%

Atomic weight of different element of calcium phosphate

C= 12g/mol , H=1g/mol

Total mass of Carbon element in C[tex]_3[/tex]H[tex]_8[/tex] = 12 × 3 = 36

Total mass of hydrogen atom in C[tex]_3[/tex]H[tex]_8[/tex] = 1 × 8 = 8

Total molar mass of  C[tex]_3[/tex]H[tex]_8[/tex] =36 + 8 =44 g/mole

Percentage of carbon in C[tex]_3[/tex]H[tex]_8[/tex] =36/44× 100  =81.8%

Percentage of hydrogen in C[tex]_3[/tex]H[tex]_8[/tex] =(8÷44)×=18%

Therefore, the percent composition of C and H in C[tex]_3[/tex]H[tex]_8[/tex] is 81.8% and 18% respectively.

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Answer:

I'm posting this so I can tell all of you that we should help him together in the comments because it seems we need more than one person to help him

Answer:

665

Explanatio

Answer:

$665

Explanation:

5 hours per week × $7 per hour = $35 per week

$35 per week × 19 weeks = $665

The molar concentration of the original HF  solution : 0.342 M

Further explanation

Given

31.2 ml of 0.200 M NaOH

18.2 ml of HF

Required

The molar concentration of HF

Solution

Titration formula

M₁V₁n₁=M₂V₂n₂

n=acid/base valence (amount of H⁺/OH⁻, for NaOH and HF n =1)

Titrant = NaOH(1)

Titrate = HF(2)

Input the value :

[tex]\tt 0.2\times 31.2\times 1=M_2\times 18.25\times 1\\\\M_2=0.342[/tex]

Answer:

Nitrogen has one lone pair of electrons

Explanation:

The above two dots in picture are lone pair

Answer:

+1

Explanation:

A Potassium atom is represented with the sign "K" in chemistry and have atomic number 19.

The charge of electrons causes a matter to experience a force and it can be positive or negative.

In Potassium atom, the electric charge is +1 to enter a stable electron configuration as there is only one valence electron in the outermost shell of potassium atom. As potassium atom will lose electron it will become positively charged.

Hence, the correct answer is "+1".

Answer:

Helium

Explanation:

Helium has the smallest atomic radius. This is due to trends in the periodic table, and the effective nuclear charge that holds the valence electrons close to the nucleus.

Answer:

van Leeuwenhoek called the organisms he saw in his microscope "animalcules." also he shined light on specimen so that he could see the right cells

Answer:

Q = 1672.84 j

c = 0.898 J/g.°C

Explanation:

1) Given data:

Mass of water = 23.0 g

Initial temperature = 25.4°C

Final temperature = 42.8° C

Heat absorbed = ?

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Specific heat capacity of water is 4.18 J/g°C

ΔT = 42.8°C - 25.4°C

ΔT = 17.4°C

Q = 23.0 g ×  × 4.18 J/g°C × 17.4°C

Q = 1672.84 j

2) Given data:

Mass of metal = 120.7 g

Initial temperature = 90.5°C

Final temperature = 25.7 ° C

Heat released = 7020 J

Specific heat capacity of metal = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = 25.7°C - 90.5°C

ΔT = -64.8°C

7020 J = 120.7 g ×  c ×  -64.8°C  (Negative sign shows heat is released)

7020 J = 7821.36 g.°C ×  c

c = 7020 J / 7821.36 g.°C

c = 0.898 J/g.°C

Answer:

194

Explanation:

Step by step I just took the test

Answer:

since the temperature is approximate to room temperature at a small pressure of 25atm, carbon dioxide is in gas phase.

Answer:

Explanation:

C. It is in the gas phase.

To solve this we must be knowing each and every concept related to  standard deviation. Therefore, 30.3 is the standard deviation of this data set. The correct option is option C.

In descriptive statistics, the standard deviation measures how widely the data points vary from the mean. It describes how values are distributed throughout the information sample and calculates how widely apart data points are from the mean.

Mathematically,

73+70+80+12+98+27 =360

mean of observations = 360/6=60

deviations from the mean

(73−60), (70−60), (80−60), (12−60), (98−60),  (27 −60)=13, 10, 20, -48, 38, -33

standard deviation (σ) formula can be given as

σ=√(13)²+(10)²+(20)²+(-48)²+(38)²+(-33)²/6

On calculations, we get:

σ=30.3

Therefore, 30.3  is the standard deviation of this data set. The correct option is option C.

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Answer:

200 m

Explanation:

Given data:

Speed of larry = 2 m/s

Time taken = 100 s

Distance travelled = ?

Solution:

Formula:

d = st

d = distance

s = speed

t = time

by putting values,

d = 2 m/s× 100 s

d = 200 m

Answer:

The answer for this question is Cs

Answer:

krypton

bromine

selenium

Tungsten is an element. It is located in the d -block of periodic table. Thus it is a transition metal. Hence, option B is correct.

Tungsten is 74th element in periodic table. It is a transition metal thus, located in the d-block of periodic table. Tungsten has the chemical symbol W. Tungsten was first identified as an element in 1781.

The maximum melting temperature of any known element other than carbon, 3,422 °C, is reached by the unbound element, making its resistance all the more remarkable (which sublimes at atmospheric pressure). Tungsten has a boiling point of around 5930°C.

A few of the many alloys that contain tungsten and have many applications include radiation shielding, X-ray tubes, electrodes in gas tungsten arc welding, superalloys, and incandescent light bulb filaments.

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Answer:

22.4

Explanation:

Answer:

174.2 grams

Explanation:

This compound is also known as Potassium Sulfate.

The SI base unit for amount of substance is the mole.

1 mole is equal to 1 moles K2SO4, or 174.25 grams.

The __ increases by 1 as you go left to right across the periodic table.

A. Atomic mass

B. Atomic number

C. Number of neutrons

D. Number of ions

Answer C

Explanation:

the model assumes that the electron is a wave and tries to describe the regions in space orb orbitals where most likely to be found

Answer: carbon dioxide

Explanation: because it is 1 carbon and 2 oxygen, and two means di-.