Magnesium and bromine react to produce magnesium bromide. What is the balanced chemical equation for this reaction?​

Answer: D

Explanation: i’m right

Answer:

Lower molar mass :)

Explanation:

Answer:

2. Lower Molar Mass

Explanation:

effusion can increase with either temperature increase, faster moving particles, or when the gas has lower molar mass. the only answer option that fits the description is answer option 2. Lower molar mass

Answer:

C . the dramatic scenery created by volcanic eruptions attracts tourists.

The statement 'lava flows and lahars clear areas of woodland or agriculture' is a negative aspect of a volcanic eruption (Option B).

In conclusion, the statement 'lava flows and lahars clear areas of woodland or agriculture' is a negative aspect of a volcanic eruption (Option B).

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The lithosphere is where all three forms of rocks form.  A physical change is a reversible change and chemical changes are irreversible. The melting of ice is a physical change and change of matter is chemical.

The lithosphere is the layer of earth where all three types of rocks such as igneous, metamorphic, and sedimentary can be found. The physical changes are those that affect physical properties and are reversible like heating and cooling.

While the chemical changes are irreversible. The physical changes lead to the change in form of the substance while chemical change leads to the rearrange of matter.

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Answer:C

Explanation:

Answer:

Substance D

Explanation:

USA Test Prep Corrections

Answer:

D. Gases were released to the atmosphere

Explanation:

In accordance to the law of conservation of mass, the total amount of reactants must equate the total amount of products at the end of the reaction because matter can not be lost or created. However, certain changes like gas evolution, formation of precipitate etc. indicates the occurrence of a chemical reaction.

In a chemical reaction, the total mass of the product(s) would be less than the total weight of the reactant(s) because GASES, which constituted part of the mass of the reaction, WERE RELEASED INTO THE ATMOSPHERE. However, if the mass of the gas released can be accounted for, the amount of reactants and products must balance.

Answer:

The reason is that sodium attaches itself very strongly to other elements. Its compounds are very difficult to break apartand also because it is so reactive.

Answer:

Indeed it is B, you are correct! :3

Explanation:

:3

Answer:

B. Drying paint

Car manufacturers use UV radiation to dry the paint o the vehicle. The high reflectivity of infrared radiation helps to keep the car interior cool. It also gives advantages over convection heating.

Explanation:

Hope it helps

Answer: It has 13 electrons total and and 3 in the valance shell.

Explanation: Aluminum

Answer:

584.2 g

Explanation:

Hello there!

In this case, since we know the 20% of the atoms correspond to sodium, we can compute the total atoms as shown below:

[tex]\frac{1.204 x10^{24}}{0.2}=6.02x10^{24}atoms[/tex]

Which are also equal to 1 mol and the Avogadro's number of sodium chloride with a molar mass of 58.44 g/mol; thus, the grams of salt turn out to be:

[tex]6.02x10^{24}atoms*\frac{1mol}{6.022x10^{23}atoms} *\frac{58.44g}{1mol}\\\\=584.2g[/tex]

Best regards!

Answer:

That would be 90 grams

Explanation:

This should be right but please, please, please correct me if I'm worng because I dont  want anyone to fail because of me. Have a great day luv <3  

The answer is option B , 90 grams of potassium chloride(KCl) is needed to saturate exactly 300 grams of water at 10°C

The measure of the degree to which a substance gets dissolved in a solvent to become a solution.

The solubility of KCl in water at 10°C is 31.2gm/100gm of water .

So in 300 gm of water 3 * 31.2 gm = 93.6 gm

Using Significant Figures we can select option B  i.e. 90 gm.

Hence Option B , 90 grams of potassium chloride is needed to saturate exactly 300 grams of water at 10°C

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Answer:

they will have 100% kinetic energy

Explanation:

all the potential energy has been used when it is at the bottom of the ramp

Answer:

It's a lot of calculation and it took me a bit of time

...

EXPLANATIONS

Consider the following combustion reaction: 2 C4H10 + 13 O2 ----> 8 CO2 + 10 H2O. 125 g or C4H10 react with 415 g of O2.

a.) Which mass of CO2 and H2O can be produced?

b.) Which substance is the limiting

a)

Molar mass of C4H10,

MM = 4*MM(C) + 10*MM(H)

= 4*12.01 + 10*1.008

= 58.12 g/mol

mass(C4H10)= 125.0 g

use:

number of mol of C4H10,

n = mass of C4H10/molar mass of C4H10

=(1.25*10^2 g)/(58.12 g/mol)

= 2.151 mol

Molar mass of O2 = 32 g/mol

mass(O2)= 415.0 g

use:

number of mol of O2,

n = mass of O2/molar mass of O2

=(4.15*10^2 g)/(32 g/mol)

= 12.97 mol

Balanced chemical equation is:

2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O

2 mol of C4H10 reacts with 13 mol of O2

for 2.151 mol of C4H10, 13.98 mol of O2 is required

But we have 12.97 mol of O2

so, O2 is limiting reagent

we will use O2 in further calculation

Molar mass of CO2,

MM = 1*MM(C) + 2*MM(O)

= 1*12.01 + 2*16.0

= 44.01 g/mol

According to balanced equation

mol of CO2 formed = (8/13)* moles of O2

= (8/13)*12.97

= 7.981 mol

use:

mass of CO2 = number of mol * molar mass

= 7.981*44.01

= 3.512*10^2 g

According to balanced equation

mol of H2O formed = (10/13)* moles of O2

= (10/13)*12.97

= 9.976 mol

use:

mass of H2O = number of mol * molar mass

= 9.976*18.02

= 1.798*10^2 g

Answer:

mass of CO2 = 3.51*10^2 g

mass of H20 = 1.80*10^2 g

b)

O2 is limiting reagent

Answer:

the second question should be along the staircase

Answer:

7.33 mol P

Explanation:

4.41 × 10²⁴ / 6.02 × 10²³ = 7.33

Answer:

the answer is 7.33 mol P

Explanation:

Answer:

1.35g of CaCO₃ are in the paracetamol

Explanation:

Assuming the volume of the 0.5mol NaOH was 23cm³

The CaCO₃ of paracetamol reacts with HCl as follows:

CaCO₃ + 2HCl → CO₂ + H₂O + CaCl₂

When an excess of HCl is added and titrated, we can find the moles of HCl that react = Moles CaCO₃ based on the second reaction:

NaOH + HCl → H₂O + NaCl

Moles added of NaOH:

23cm³ = 0.023L * (0.5mol / L) = 0.0115 moles NaOH = Moles HCl in excess

Moles of HCl:

25cm³ = 0.025L * (1.0mol / L) = 0.025 moles HCl

The moles of HCl that reacted = Moles CaCO₃ are:

0.025 moles - 0.115 moles = 0.0135 moles CaCO₃

The mass of CaCO₃ -Molar mass: 100.09g/mol- is:

0.0135 moles CaCO₃ * (100.09g/mol) =

Answer:

69.152 % → 63Cu

30.848 % → 65Cu

Explanation:

As you know, the average atomic mass of an element is determined by taking the weighted average of the atomic masses of its naturally occurring isotopes.

Answer:

500 Kg/m³

Explanation:

From the question given above, the following data were obtained:

Mass of empty bottle = 20 g

Mass of bottle + petrol = 40 g

Mass of bottle + water = 60 g

Density of water = 1000 Kg/m³

Density of petrol =?

Next, we shall determine the mass of water. This can be obtained as follow:

Mass of empty bottle = 20 g

Mass of bottle + water = 60 g

Mass of water =?

Mass of water = (Mass of bottle + water) – (Mass of empty bottle)

Mass of water = 60 – 20

Mass of water = 40 g

Converting 40 g to Kg, we have:

1000 g = 1 Kg

Therefore,

40 g = 40 × 1 Kg / 1000 g

40 g = 0.04 Kg

Next, we shall determine the volume of the bottle by calculating the volume of water. This can be obtained as follow:

Mass of water = 0.04 Kg

Density of water = 1000 Kg/m³

Volume of water =?

Density = mass / volume

1000 = 0.04 / volume

Cross multiply

1000 × volume = 0.04

Divide both side by 1000

Volume of water = 0.04 / 1000

Volume of water = 4×10¯⁵ m³

Thus, the volume of the bottle is 4×10¯⁵ m³

Next, we shall determine the mass of the petrol. This can be obtained as follow:

Mass of empty bottle = 20 g

Mass of bottle + petrol = 40 g

Mass of petrol =?

Mass of petrol = (Mass of bottle + petrol ) – (Mass of empty bottle)

Mass of petrol = 40 – 20

Mass of petrol = 20 g

Converting 20 g to Kg, we have:

1000 g = 1 Kg

Therefore,

20 g = 20 × 1 Kg / 1000 g

20 g = 0.02 Kg

Finally, we shall determine the density of the petrol. This can be obtained as follow:

Mass of petrol = 0.02 Kg

Volume of petrol = 4×10¯⁵ m³

Density of petrol =?

Density = mass / volume

Density of petrol = 0.02 / 4×10¯⁵

Density of petrol = 500 Kg/m³

Answer:

Aluminum is the second most abundant metallic element on earth. It has been estimated that 8% of the earth's crust is composed of aluminum, usually found in the bauxite form. On a volume basis, aluminum has become the most widely used non-ferrous metal.

Primary aluminum production is the quantity of primary aluminum produced in a specified period and the quantity of molten or liquid metal tapped from pots that is weighed before transfer to a holding furnace or before further processing.

Explanation:

Answer:

1. The balanced equation:

Zn + 2HCl —> ZnCl₂ + H₂

The coefficients are: 1, 2, 1, 1

2. 2.34 moles of HCl

Explanation:

1. The balanced equation

__Zn + __HCl —> __ZnCl₂ + __H₂

There are 2 atoms of H on the right side and 1 atom on the left side

It can be balance by writing 2 before HCl as shown below:

Zn + 2HCl —> ZnCl₂ + H₂

Now the equation is balanced.

The coefficients are: 1, 2, 1, 1

2. Determination of the number of mole of HCl that reacted.

NOTE: 1 mole of H₂ = 22.4 L at STP.

Zn + 2HCl —> ZnCl₂ + H₂

From the balanced equation above,

2 moles of HCl reacted to produce 1 mole (i.e 22.4 L) of H₂.

Finally, we shall determine the number of mole of HCl needed to produce 26.22 L of H₂. This can be obtained as follow:

From the balanced equation above,

2 moles of HCl reacted to produce 22.4 L of H₂.

Therefore, Xmol of HCl will react to produce 26.22 L of H₂ i.e

Xmol of HCl = (2 × 26.22)/22.4

Xmol of HCl = 2.34 moles

Thus, 2.34 moles of HCl is needed for the reaction.

Answer:

9.96 × 10⁸

Explanation:

Step 1: Calculate the diameter of 1 aluminum atom

The diameter of a sphere is 2 times the radius.

d = 2 × 140 pm = 280 pm

Step 2: Convert "d" to m

We will use the conversion factor 1 m = 10¹² pm.

280 pm × 1 m/10¹² pm = 2.80 × 10⁻¹⁰ m

Step 3: Convert the total length (L) to m

We will use the conversion factor 1 m = 100 cm.

27.9 cm × 1 m/100 cm = 0.279 m

Step 4: Calculate the number of atoms of aluminum required

We will use the following expression.

L/d = 0.279 m/2.80 × 10⁻¹⁰ m = 9.96 × 10⁸

Answer

Latitude or distance from the equator , Temperatures drop the further an area is from the equator due to the curvature of the earth. In areas closer to the poles, sunlight has a larger area of atmosphere to pass through and the sun is at a lower angle in the sky.

Answer:   Rb (rubidium) has a radius of 290 pm, making it have the largest of the 5 elements listed.

Explanation:

Answer:

Cd(NO3)2   +  FeCl3 =  CdCl2 + Fe(NO3)2  

is an impossible equation to balance as this reaction will simply not occur and it will not work either ways

did your teacher make this ? 

Answer: 37.01 moles (mol) of gas

Explanation:Use PV=nRT

which is also equal to n=PV/RT

P=2.90

V= 4.80

R = 8.31 (R will always be the same in any equation)

T= 62.0

2.90 x 4.80= 13.92 / 8.31 x 62= 515.22

13.92/13.92=515.22/13.92

n= 37.01 mol

Answer:

when they collide they can experience collision

because without force collision wouldn't have happen.