I need help fast!!! Fill in the coefficients

Answer:

False

Explanation:

An object's velocity can be described by it's direction. Because velocity is a vector. Besides velocity and acceleration are different units they can't be described by each other.

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

Answer:

Ephemerals

Explanation:

The first plants to move into the new bare ground after a wildfire are wildflowers or “weeds.” These fast-germinating, leafy herbaceous plants are also known as “forbs” or “ephemerals.” They quickly germinate, grow and produce a new crop of seeds.

Answer:

ephemeral

Explanation:

Answer:

d

Explanation:

it just makes sense

Answer:

Cold temperatures!

Explanation:

Both planets are very far from the sun, now to explain how the other answers would fit or just dont make sense, No rings, the answer isn't the best fitting answer for this question, 27 moons, this is wrong because neptune has 14 moons, only uranus has 27. No axis tilt, this answer is wrong because both planets have an axis.

Answer: DNA is essential...because it carries the genetic code.

Explanation:

Although the other statements are true about DNA, it's a spiral helix and can break apart, its main function is that it contains the genetic code for organisms.

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:

it might be the second answer

Answer:

J

Explanation:

Chlorine Gas is Cl2 so if it isnt on the left as that its wrong.

Then on the products see that Fe III means Fe is +3 charge so we have to have 3 Cl to balance it to 0 since each cl as -1 charge.

FInally check if the equation is balanced J is maybe H but its to blurry to tell

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]

Answer:

B. Which type of teeth are most important in crushing food?

Explanation:

According to the question physical changes ought to be entered into column A while chemical changes ought to be entered into column B.

The crushing of food is a physical change. It does not involve any chemical transformation of the food material.The other options involve some sort of chemical transformation taking place on the food material being digested.

We plot the cups of coffee drink on the X-axis, whereas hours of sleep are plotted on the Y-axis.

plotting graphs  relationship between various sets of variables with respect to one another. the main use of a graph is  it helps us to  present data which are complex to describe in the text.Since in the problem it is given that, the student wants to record the hours of sleep which are affected by the number of cups of coffee consumed by her or  him, therefore we will plot the number of cups of coffee on the X-axis and the number of hours of sleep will be plotted in  Y-axis .

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Answer:

minimum energy

Explanation:

minimum energy means maximum stability

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The third launch ( with 300 N force) had  the greatest acceleration of the tennis ball

Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object  

∑F = m. a  

[tex]\large{\boxed{\bold{a=\frac{\sum F}{m}}}[/tex]

F = force, N  

m = mass = kg  

a = acceleration due to gravity, m / s²  

From the above equation it has been shown that the force acting on the object is directly proportional to its acceleration, so the greater the force exerted on the object, the greater the acceleration of the object produced.

Answer:

0.0593237097

Explanation:

Answer:  [tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex] , 0.533 L

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

[tex]CaCO_3(s)\rightarrow CaO(s)+CO_2(g)[/tex]

According to avogadro's law, 1 mole of every substance occupies 22.4 L of volume at STP.

Number of moles =[tex]\frac{\text {given mass}}{\text {Molar mass}}[/tex]

moles of calcium carbonate = [tex]\frac{2.38g}{100g/mol}=0.0238mol[/tex]

As 1 mole of calcium carbonate produces = 22.4 L of carbon dioxide at STP

Thus 0.0238 moles of calcium carbonate produces =[tex]\frac{22.4 L}{1}\times 0.0238=0.533L[/tex] of carbon dioxide at STP

The balanced equation is [tex]CaCO_3(s) \rightarrow CaO(s) + CO_2(g)[/tex]

The number of liters of carbon dioxide that should be produced is 0.533L

As per this law, the mass could neither be developed nor be destroyed. So, the mass of products should be equivalent to the mass of reactants. The number of atoms of every element has to be the similar on reactant and product sides. Due to this, the chemical equations are balanced.

[tex]CaCO_3(s) \rightarrow CaO(s) + CO_2(g)[/tex]

As per this law,  1 mole of every substance occupies 22.4 L of volume at STP.

So,

We know that

Number of moles = [tex]given\ mass \div molar\ mass[/tex]

Now the moles of calcium carbonate is [tex]= 2.38 \div 100[/tex] = 0.0238 mol

Since 1 mole of calcium carbonate generated = 22.4 L of carbon dioxide at STP

So, 0.0238 moles of calcium carbonate generated

[tex]= 22.4 \div 1 \times 0.0238 \\\\= 0.533L[/tex]

 of carbon dioxide at STP

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Answer:

<br> a) Barium chloride and sodium sulphate aqueous solutions react to give insoluble barium sulphate and aqueous solution of sodium chloride.

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:

matter

Explanation:

All physical 'stuff'

Answer:

matter

Explanation:

Matter is anything that has mass and occupies space .

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new volume

[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]

From the question we have

[tex]V_2 = \frac{2.5 \times 4.5}{2.2} = \frac{11.25}{2.2} \\ = 5.1136666...[/tex]

We have the final answer as

Hope this helps you

Answer:

Atomic radius Increases in groups from top to bottom and decrease in period from left to right.

Explanation:

Mass of this substance = 9.928 g

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

[tex]\boxed{\bold{n=V\times M}}[/tex]

mol of substance -Lithium nitrite - LiNO₂ :

V = 250 ml = 0.25 L

M = 0.75 M

[tex]\tt n=0.25\times 0.75=0.1875[/tex]

So mass of this substance -  LiNO₂ (MW=52,947 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=0.1875\times 52,947 g/mol\\\\mass=9.928~g[/tex]

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:

Molar mass = 105 g/mol

Explanation:

Given data:

Mass of gas = 3.15 g

Pressure = 785 mmHg

Temperature = 20°C

Volume of gas = 750 mL

Molar mass of gas = ?

Solution:

Pressure = 785 mmHg (785/760 = 1 atm)

Temperature = 20°C (20+273 = 293 K)

Volume of gas = 750 mL (750 mL× 1 L/1000 mL = 0.75 L)

PV = nRT

R = general gas constant (0.0821 atm.L/mol.K)

1 atm× 0.75 L =  n×0.0821 atm.L/mol.K × 293 K)

0.75 atm.L = n× 24.06 atm.L/mol

n = 0.75 atm.L / 24.06 atm.L/mol

n = 0.03 mol

Molar mass of gas:

Molar mass = Mass / number of moles

Molar mass = 3.15 g/ 0.03 mol

Molar mass = 105 g/mol