I don't really understand this worksheet question.​

the answer is 9

Explanation:

Explanation: In 1 formula unit of Al(NO3)3 , there are (clearly!) 9 atoms of oxygen, 3 nitrogen atoms, and 1 aluminum atom.

Answer:

B. The reaction rate decreases

Explanation:

I just took the pre test and got a 100

Explanation:

magnesium  +  zinc oxide  --> magnesium oxide  +  zinc

Mg + ZnO --> MgO + Zn

Reactants:

- Magnesium

- Zinc Oxide

Products:

- Magnesium oxide

- Zinc

Type of reaction: Displacement Reaction

The provided word equation depicts a chemical reaction between magnesium and zinc oxide that results in the creation of magnesium oxide and zinc.

Magnesium and zinc oxide are the reactants in the process. These are the substances that alter chemically. The process produces magnesium oxide and zinc. These are the new chemicals produced by the chemical process. This reaction undergoes a chemical transformation, as indicated by the term equation. Magnesium oxide and zinc are formed when magnesium interacts with zinc oxide.

The reaction's stoichiometry is not explicitly stated in the word equation. We cannot establish the exact quantities of the reactants and products involved without further information or factors. The term equation denotes that the reaction obeys the rule of mass conservation. The total mass of reactants must equal the total mass of products.

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Answer:

Did u get the answers

Explanation:

Answer:

V₂ = 0.958 atm

Explanation:

Given data:

Initial volume = 2300 mL (2300/1000 = 2.3 L)

Initial pressure = 1.88 atm

Final volume = (2.21 L + 2.3L) = 4.51 L

Final pressure = ?

Solution;

The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

1.88 atm × 2.3 L =  P₂ × 4.51 L

V₂ = 1.88 atm × 2.3 L / 4.51 L

V₂ = 4.32 atm.L /  4.51 L

V₂ = 0.958 atm

Answer:

The correct answer is - B. Groups of the ancestral species became isolated and adapted to different environments.

Explanation:

Two finches Warbler Finch and Woodpecker Finch are two distinct finches are finches from the Galapagos Islands. Both of these finches have a common ancestor from South America.

The most likely explanation of developing two distinct species from an ancestral finch is by bein isolated and developed or adapted according to the challenges and environmental conditions and ultimately become different species after several generations.

Answer:

I say 20 is ur best option

Answer:

uh yeah I think so technically

Answer:

no

Explanation:

Answer:

cold butter melted when heated, lighting a match, baking cookies,

Explanation:

CH4 + 2O2 =》CO2 + 2H2O

Answer:

the balanced chemical reaction is provided above .

Explanation:

the given reaction is reaction of methane with oxygen ( or burning of methane in presence of oxygen )

it is highly exothermic, because high amount of heat is evolved in this reaction

Answer:

ok:

Explanation:

We have:

[tex]q = mc\Delta T[/tex]

we know that q = -5000 J (it is negative since you release energy)

m = 320 g

and c = 376 J/kg.

We need to be careful before plugging them in. Since the units are J/kg for c, but we are talking about grams for m, we need to convert. I will just divide c by 1000  to get c = 0.376 J/g

We can now plug in:

(-5000 J) = (320 g) * (0.376 J/g) * [tex]\Delta T[/tex]

We can solve that [tex]\Delta T[/tex] = -41.5555

So the final temperature is [tex]T - \Delta T[/tex] which equals around 8.4°C.

Answer:

Molecular formula = C₄H₆As₆Cu₄O₁₆

Explanation:

Given data:

Empirical formula = C₂H₃As₃Cu₂O₈

Molar mass of compound = 1013 g/mol

Molecular formula = ?

Solution:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass  of C₂H₃As₃Cu₂O₈ is 506.897 g/mol

by putting values.

n = 1013 / 506.897

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₂H₃As₃Cu₂O₈)

Molecular formula = C₄H₆As₆Cu₄O₁₆

Answer:

The earth

Since it is shown in the chart that, Earth is inner corner is the smallest.

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question we have

[tex]density = \frac{31.6}{9.5} \\ = 3.326315...[/tex]

We have the final answer as

Hope this helps you

Our Sun will eventually turn into a red giant in the cooler temperature and high luminosity and in the white dwarf phase has a hot temperature & dim luminosity.

In astronomy, the Hertzsprung-Russell diagram, often known as the H-R diagram, is a graph that plots the absolute magnitudes (intrinsic brightness) of stars against their spectral classifications (temperatures).

From the given diagram it is clear that when sun turns into a red giant then the temperature decreases and luminosity increases as it becomes large in size. And when it finally become a white dwarf then temperature comparatively increases and luminosity gets dim due to smaller size.

Hence in the red giant phase sun has a cooler temperature and high luminosity and in the white dwarf phase has a hot temperature & dim luminosity.

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Answer: wind

Explanation:

Answer:

3: 1 CH4+ 2 O2-> 1 CO2 + 2 H2O

4: 2 K+ 2 H2O -> 2 KOH+ 1 H2

Explanation:

Answer:

energy held by by an object becuase of its position relative to other objects

Explanation:

Answer:

The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge , other factors.

Explanation:

I looked it up because i wanted to be sweet and help ((:

Answer:

ok       .

Explanation:

    .

Answer:

HERE

Explanation:Therefore, there will be

6.022

×

10

23

oxygen atoms in

1

mole, or

18 g

of water.

Answer:

The magnetic field line data refutes the claim that the magnets were misaligned in the Tuesday launch.

Explanation: The data shows that there was no difference in the pattern of the field lines for all three launches. If the magnets in Tuesday's test had been misaligned, the force between the magnets in that test would be different than in the other test, showing both attraction and repulsion. During a misalignment at least one field line would connect opposite poles of the other magnets, but the magnetic field lines data we received did not show proof of misalignment.  Therefore the magnets were correctly aligned on Tuesday.

Answer:

it lost 900J of energy I will assume and that would mean the change in energy is -900J

Explanation:

Answer:

The scale reads the tension in the string. The tension in the string is 100 N. This is the force the string must exert up on either of the 100-N weights at either end of the string.

Nothing is moving, nothing is accelerating, so the net force on the spring is zero. Likewise, the net force on either of the 100-N weights is also zero. But that is another question. The spring scale does not measure the net force. The spring scale simply measures the tension, the magnitude of the force exerted by the string.

Explanation:

Answer:

0 m/s

Explanation:

An object at rest stays at rest unless acted upon therefore it can only be 0.