i need help i got these wrong on my first attempt

Answer:

Explanation:

Answer:

dissolve

Explanation:

salt will dissolve in water while sand will not, so you arent going to see salt pass through

Answer:

b

Explanation:

Answer:

See explanation

Explanation:

The atomic number refers to the number of protons in the nucleus of an atom. We identify an element by its atomic number.

When the atomic number of an atom of an element is changed, we have changed the identity of that atom and transformed it into an atom of a different element.

For example, if we add a proton to a sodium atom, we create a magnesium atom. If we remove a proton from a sodium atom, we create a neon atom.

Answer:

The answer is J (9.46 L)

Answer:

96g of CO₂ would be produced

Explanation:

Based on the reaction:

CH₄ + 2O₂ → CO₂ + 2H₂O

1 moles of methane, CH₄ produces 1 mole of carbon dioxide, CO₂.

To solve this question we must find the moles of methane added in the reaction. These moles added are equal to moles of CO₂ produced. With the molar mass of CO₂ (44.01g/mol) we can find the grams that would be produced:

Moles CH₄ -Molar mass: 16.04g/mol-:

35g * (1mol / 16.04g) = 2.182 moles of CH₄ are added = Moles CO₂ produced.

Mass CO₂ produced.

2.182 moles CO₂ * (44.01g / mol) =

Answer:

1375 J/kg.°C

Explanation:

From the question First question,

Q = cm(Δt)................... Equation 1

Where Q = Heat released, c = specific heat capacity of the unknown metal, m = mass of the unknown metal, Δt = Change in temperature.

make c the subject of the equation

c = Q/mΔt.................. Equation 2

Given: Q = -5500 J (Since heat is released, Q is negative), m = 200 g = 0.2 kg, Δt = 10-30 = -20°C

Substitite these values into equation 2

c = -5500/[0.2×(-20)]

c = -5500/-4

c = 1375 J/kg.°C

The Fe is our limiting reactant here. First, convert the mass of Fe given to moles of Fe by dividing mass by the molar mass:

(51.3 g Fe)/(55.845 g/mol) = 0.9186 mol Fe.

According to the balanced equation, 2 moles of Fe2O3 are produced for every 4 moles of Fe that are consumed. In other words, half as many moles of Fe2O3 will be produced as there are Fe that react:

(0.9186 mol Fe)(2 mol Fe2O3/4 mol Fe) = 0.4593 mol Fe2O3.

Finally, convert the moles of Fe2O3 back to grams by multiplying by the molar mass of Fe2O3:

(0.4593 mol Fe2O3)(159.6882 g/mol) = 73.3 g Fe2O3.

So, 73.3 grams of Fe2O3 are formed.

Answer:

body temperature and energy

Answer:

92.37°C

Explanation:

Assuming the volume remains the same in both the states ( bicycle tire).

Then as per ideal gas equation

[tex]P_1/T_1 = P_2/T_2[/tex]

where P1, P2 are pressure at two different states and T1, T2 are temperature at these two states

Given:

P1 = 1.34 atm, T1 = 33.0 ° C = 306K

P2 = 1.60 atm, T2 = ?

1.34/306 = 1.60/T_2

⇒ T2 = 1.60×306/1.34

= T2= 365.37K= 92.37°C

Answer:

“Newton’s Law of Gravity” gives the gravity force between two objects with masses m

and M separated by distance r:



F  G

m M

r

2

G is called the Gravitational Constant, and has the value



6.671011N m

2

kg2

(N is for

Newton, the physicists’ unit of force) or



1.51011 lbm

2

kg2

.

Let’s go back to the example given in the text: two 150 lb people separated by 1 meter.

The mass of each person is



150lb

2.2

lb

kg

 68kg

. Putting these into the formula gives



F 1.5101 1 lb m

2

kg2



(68kg)

2

(1m)

2

107

lb.

Newton’s Law of Gravity actually gives the force only between two small objects. If one

of the objects is a sphere (such as the Earth) then it turns out that you can still use the

formula, but you must use the distance to the center of the sphere as the value for r. As

an example, let’s put in numbers for a 1 kg object sitting on the surface of the Earth.

Then the force of attraction is given by the gravity equation with m = 1 kg, M = the mass

of the Earth =

24 610

kg, and r = radius of the Earth (that’s the distance to the center of

the sphere). This distance is r = 6371 km ≈

6

610

meters. Without plugging in the

numbers, can you guess what the answer will turn out to be? Guess, and then check this

footnote2

to see if you guessed correctly.

Suppose you weigh 150 lbs on the Earth. Then your mass is



150lb

2.2

lb

kg

 68kg

. What will

you weigh on the Moon? We can calculate that by using Newton’s Law of Gravity, and

putting in the M = the mass of the Moon =

22 7.310

kg, r = the radius of the moon =

6

1.710

meters. The answer is F = 25 lb. That means you will weigh 25 lb. on the

surface of the Moon.

Explanation:

hope this helps :)

Answer: Exothermic because the ΔH is negative.

Explanation:

The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.

[tex]C(s)+O_2(g)\rightarrow CO_2(g)[/tex]

Exothermic reactions are those reactions in which heat is released and [tex]\Delta H[/tex] is negative.Endothermic reactions are those reactions in which heat is absorbed and [tex]\Delta H[/tex] is positive.

The reaction is exothermic as the heat is released during the formation of [tex]CO_2[/tex] as heat of formation of [tex]CO_2[/tex] is negative.

Answer:

it is true

Explanation:

hope it helps :)

Answer: I think it is true

Explanation:

it is true because it will start rusting when there is a scratch on the paint!

I HOPE THIS HELPS YOU!!

Answer:

Malleability : Capable of being shaped or bent.

Ductility : Easily pulled or stretched into a thin wire.

Luster : Has a shine or glow.

Conductivity : Good transmission of heat or electricity.

Softness : Soft enough to be cut with a knife.

Answer:

823.98

Explanation:

Since there is only one Ba per atom you simply times 1 by 6 to get the number of mols of Ba per atom, then you times this by the atomic mass of Ba on the periodic table

Answer:

what is your question?

Explanation:

I don't understand

Answer:

[tex]186.01\ \text{mL}[/tex]

Explanation:

[tex]P_1[/tex] = Initial pressure = 1.47 atm

[tex]P_2[/tex] = Final pressure = [tex]10^5\ \text{Pa}[/tex]

[tex]T_1[/tex] = Initial temperature = [tex]44^{\circ}\text{C}[/tex]

[tex]T_2[/tex] = Final temperature = [tex]273.15\ \text{K}[/tex]

[tex]V_1[/tex] = Initial volume = 145 mL

[tex]V_2[/tex] = Final volume

We have the relation

[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}\\\Rightarrow V_2=\dfrac{P_1V_1T_2}{T_1P_2}\\\Rightarrow V_2=\dfrac{1.47\times 101325\times 145\times 273.15}{(44+273.15)\times 10^5}\\\Rightarrow V_2=186.01\ \text{mL}[/tex]

Final volume of the sample is [tex]186.01\ \text{mL}[/tex].

Answer:

Cattles are giving nutrition supply throughout the year----some animals require nutrient enhancement for health

calves are given colostrum at birth----newborns require antibodies from their mothers

I dont want to write, so you know what the last option is

Explanation:

:) hope this helps

Answer:

218.98 grams

Explanation:

Given that,

No. of moles, n = 2.3

The molar mass of magnesium chloride is 95.211 g/mol.

We need to find the mass of 2.3 moles of magnesium chloride.

We know that,

No. of moles = given mass/molar mass

Let m be the given mass. So,

[tex]m=n\times M\\\\=2.3\times 95.211 \\\\=218.98\ g[/tex]

So, the required mass is equal to 218.98 grams.

Answer:

The molar mass of the gas is 90.4g/mol

Explanation:

To solve this question we have to use the equation:

d = PM / RT

Where d is density of the gas = 2.29g/L

P is pressure = 0.75atm

M is molar mass of the gas = ??

R is gas constant = 0.082atmL/molK

T is absolute temperature = 88°C + 273.15 = 361.15K

Solving for M:

dRT / P = M

2.29L*0.082atmL/molK*361.15K / 0.75atm = M

90.4g/mol = M

The molar mass of the gas is 90.4g/mol

Answer:

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Answer:

There are 5 steps/rules of the ideal gases based on kinetic theory.

Explanation:

1. Particles in a gas are constant moving in random motion.

2. combined volume of the particles is negligible.

3. particles exert no forces on one another

4. any collisions between the particles are completely elastic

5. the average kinetic energy of particles is proportional to temperature in kelvins.

(I had help explaining steps from Sal Khan. I hope this helps! Have a great day!)

Answer:

a.) exothermic

b.) 2,800.6 J

Explanation:

Answer:

(B) Grasses to Grasshoppers to Birds to Foxes

Explanation

can you explain it further

Answer:

b.location in the sky (If the question is saying:The H-R diagram is useful in

studying all of these about a star except for)

Explanation:

The theoretical HR diagram plots the temperature of the star vs their luminosity (brightness) and the observational HR diagram plots color of the stars vs the absolute magnitude. Depending on mass, stars will also go through specific evolutionary stages that can be seen through the location of the star on the HR diagram. However, the HR diagram will not have data on the location of the star in the sky.

Answer: Diploid Cells (?)

Explanation:

Answer:

400ml

Explanation:

The average speed of the food cart to the nearest tenth of a m/s is 0.3 meter per second.

Speed of any moving body will be calculated by using the below formula as:

Speed = Distance / Time

Given that, Distance travelled to the right side = 4.5m

Time to travel = 15 sec

On putting values on the above equation, we get

Speed = 4.5 / 15 = 0.3 m/s

Hence required speed is 0.3m/sec.

To know more about speed, visit the below link:

https://brainly.com/question/6504879