If 980kJ of energy as heat are transferred to 6.2L of water at 291 K what will the final temperature be? The specific heat of water is 4.18 J/g•K. Assume that 1.0 mL of water equals 1.0 g of water.

1,000 times the base unit is kilo

1/1,000,000 of the unit base is micro

1/100 of the base unit is centi

1,000,000 times the base unit is mega

1/1,000 of the base unit is milli

1/1,000,000 of the base unit is nano

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An ion is formed when an atom gains or loses electrons.

Answer:

lose or gain electrons

Answer:

The molecular formula of X is given as [tex]C_7 H_6 O_3[/tex]

Explanation:

[tex]Moles $C O_{2}=\frac{\text { mass }}{\text { molar mass }}=\frac{13.39 \mathrm{g}}{44.01 \mathrm{g} \text { per mole }}=0.304 \mathrm{mol}$\\\\moles $\mathrm{C}=$ moles $\mathrm{CO}_{2}=0.304 \mathrm{mol}$[/tex]

[tex]mass $C=$ moles $\times$ molar mass $=0.304 \mathrm{mol} \times 12 \frac{g}{m o l}=3.65g$\\\\moles $\mathrm{H}_{2} \mathrm{O}=\frac{2.35 \mathrm{g}}{18.02 \mathrm{g} \text { permole }}=0.130 \mathrm{mol}$\\\\moles $\mathrm{H}=2 \times$ moles $\mathrm{H}_{2} \mathrm{O}=0.130 \times 2=0.260 \mathrm{mol}$\\\\Mass $\mathrm{H}=0.260 \mathrm{mol} \times 1.008 \frac{g}{\mathrm{mol}}=0.262 \mathrm{g}$[/tex]

mass O = Total mass of the compound - (mass of C + mass of H)

=6.0 g - ( 3.65 + 0.262 ) g

=2.09 g

[tex]moles $O=\frac{2.09 g}{16 g \text { per mole }}=0.131 \mathrm{mol}$[/tex]

Least moles is for O that is 0.131mol and dividing all by the least we get

[tex]$\begin{aligned} C &=\frac{0.304}{0.131}=2.3 \\\\ H &=\frac{0.260}{0.131}=2 \\\\ O &=\frac{0.131}{0.131}=1 \end{aligned}$[/tex]

Since 2.3 is a fraction it has to be converted to a whole number so we multiply all the answers by 3

[tex]\\$C 2.3 \times 3=7$\\\\$H 2 \times 3=6$\\\\$O 1 \times 3=3$[/tex]

So the empirical formula is [tex]C_7 H_6 O_3[/tex]

Empirical formula mass

[tex]=(7 \times 12) +(6\times1.008)+(3\times16)=138.048g[/tex]

[tex]$n=\frac{\text { molar mass }}{\text { empirical formula mass }}=\frac{138}{138.048}=1$[/tex]

Molecular formula =n × empirical formula

[tex]=1 \times C_7 H_6 O_3[/tex]

Compound X  = [tex]C_7 H_6 O_3[/tex]  is the Answer

To find the molecular formula of Compound X, we calculate the empirical formula using the moles of carbon dioxide and water produced. The empirical formula is CH2O. The molecular formula is (CH2O)5.

To find the molecular formula of Compound X, we need to determine the empirical formula first. From the given information, we can calculate the moles of carbon dioxide and water produced. The moles ratio of carbon to oxygen in carbon dioxide is 1:2, while the moles ratio of hydrogen to oxygen in water is 2:1. Using these ratios, we can find the moles of carbon, hydrogen, and oxygen in Compound X. The empirical formula of X is CH2O.

The molar mass of the empirical formula is 30 g/mol. To find the molecular formula, we divide the molecular molar mass of X by the molar mass of the empirical formula. Dividing 138 g/mol by 30 g/mol gives us approximately 4.6, which we can round to 5. This means the molecular formula of X is (CH2O)5.

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Answer:Hydrogen gas is prepared in laboratory by the action of dilute HCl upon granulated zinc. Note: This is a redox reaction since Zn is oxidized and H+ ions is reduced here. Procedure: ... Some crystals of copper sulphate are added to increase the rate of reaction.

Explanation:

Answer:

Explanation:

The new product is a compound which is a product of combination of two reactants. This form of reaction is called Synthesis or combination. It involves the formation of compounds from the union of constituent elements in a reaction.

A compound is composed of two or more kinds of elements that are joined together in a definite grouping.

Answer:

Physical.

Explanation:

A chemical property would more be its reaction to water vs acid

Final answer:

The bendability of construction paper is a physical property. Physical properties include characteristics that can be observed without changing the substance's chemical identity.

Explanation:

The ability of construction paper to bend is related to its physical properties. Physical properties can be observed or measured without changing the identity of the substance. In the case of construction paper, its flexibility is a physical property because it informs us about the paper's ability to bend or change shape without altering its chemical composition.

Among physical properties, we find characteristics such as color, density, and malleability, which also includes the paper's ability to bend. Materials like construction paper are designed to be flexible and are often used for activities that rely on bending and shaping without breaking.

Answer:

The option which best describes the riders is :

Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating

Explanation:

Franklin is not accelerating as the final velocity (50 km/h) is equal to the initial velocity (50 km/h) , rather he is moving at a constant speed.

Acceleration = (final velocity - initial velocity) / (final time - initial time)

According to acceleration formula given above , the rate at which Gabriella is slowing down is 2.3 km/h and the rate at which Kendall is speeding up is also 2.3 km/h.

Hence the option stating "Gabriella is is slowing down at the same rate that Kendall is speeding up and Franklin is not accelerating"  is true and it best describes the riders.

Answer: B.

B. Gabriella is slowing down at the same rate that Kendall is speeding up, and Franklin is not accelerating.

Answer:

a rock containing a lot of iron

Explanation:

Iron ore is an ore of iron and this implies a rock that contains a substantial amount of iron.

An ore is a naturally occurring rock type that hosts a certain type of metal or solid that can be won at profit with some gangue minerals. Iron ore is one such type of substance from which significant amount of iron can be extracted for use by man. The remaining part quite not useful is the gangue.

Answer:

There is 1 lead (Pb) element, 2 nitrogen (N) elements and 6 oxygen (O) elements.

Explanation:

Brackets in chemistry work the same like in maths. You multiply each element in the bracket depending on the power. In this case, we have a nitrogen atom and three oxygen atoms, in brackets, with a power of 2. You multiply the nitrogen atoms by 2, ending up with 2 nitrogen atoms, and you multiply the oxygen atoms by 2, ending up with 6.

Answer: Pb2N4O12

Explanation: Pb = 1 X 2= 2 N = 2 x 2 = 4 O = 2+8+2 = 12

Answer:

From the arrangement of electrons

Explanation:

The atomic numbers of the elements in the various groups differ because they contain different numbers of protons.

Atomic number of an element is the number of protons in that element and it is a property that is used to distinguish one element from another.

Elements are substances that contains atoms which cannot be broken down further into any smaller substances.

Periodic table is a structured table that arranged these elements according to the number of atoms they contain in their shells.

In a periodic table, these elements appear in periods and in groups.

The groups contain elements that share the same number of atoms in their outermost shell.

Therefore, group 1, 2, 13 and 18 contain elements that vary because they contain different numbers of protons.

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Answer:

Herbivores

Members of the same species living in the same plac at the same time

Abiotic Factors

grasses → shrubs → softwood trees → hardwood trees

lichens → grass → shrubs → trees

the sustainability of ecosystems is decreasing regardless of protected areas.

an increase in the islanders' consumption of land and migratory birds, resulting in a decrease in the bird population

More access to renewable resources

Emigration

Can open or limit possibilities of future generations

Amount of food produced in an area

Clear Cutting

To create the soil

Endangered

Clumped

Explanation:

Answer:

As given below.

Explanation:

1. herbivores.

2. By all the types of organisms living in the same place.

3. Abiotic factors.

4. the hardwood trees to shrubs and softwood trees then to mosses.

5. From lichens to grass to shrubs and trees.

6. sustainability of the ecosystems is increasing more in protected areas.

7. the erosion of topsoil, leading to decreased crop production.

8. an increase in food supplies and better access to clean water.

9. emigration

10. will not limit any kind of possibilities for future generations.

11. It is the amount of land needed for a crop.

12. clearcutting

13. to create the soil.

14. threatened.

15. clumped

If the liquid and the gas are both the same substance, then the gas particles are moving faster than the liquid particles, and this statement is false.

If they're different substances ... like for example liquid iron and oxygen gas ... then it could go either way, depending on the substances.

The statement that liquid particles move faster than gas particles is generally false. At the same temperature, gas particles typically move faster than liquid particles due to the difference in kinetic energy and intermolecular forces.

The statement 'Liquid particles move faster than gas particles' is generally false. The speed of particles depends on their temperature, not their state. However, at the same temperature, gas particles typically move faster than liquid particles.

This is due to the fact that gas particles have more kinetic energy and less intermolecular forces restricting their movement compared to liquid particles. For instance, particles in steam (gas) would move faster than particles in water (liquid) at the same temperature.

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Answer: D. An acid-base conjugate pair that keeps the pH from changing

Explanation: the answer is D. An acid-base conjugate pair that keeps the pH from changing, because we have to keep in mind which is the scope of this solution, and the scope is maintain the pH despite the changes in the solutions or support any change when you add another solution to the buffer.

also we need to know that a Buffer achieve their resistance to the changes of the pH, because of the presence of an equilibrium between the acid HA and its conjugate base.

This equilibrium give the properties to this solution to support the changes.

Answer:

Classification, or taxonomy, is a system of categorizing living things.

Explanation:

There are seven divisions in the system: (1) Kingdom; (2) Phylum or Division; (3) Class; (4) Order; (5) Family; (6) Genus; (7) Species. Kingdom is the broadest division.

Answer: 2, 4

Explanation:

Carbon varies, so it can have either 2 or 4 electrons

Answer:

2, 4

Explanation:

Answer:

The length of the fence is 22.5ft and the width of the fence is 7.5ft.

Explanation:

To solve this problem we will turn this question into an equation.

The equation for the perimeter of a rectangle is 2l + 2w = perimeter.

In the question we were given the perimeter so we can go ahead and plug this in.

2l + 2w = 60

In the question we are also told that the fence is 3 times as long as it is wide. This means that 1l = 3w. We can now subsitute l for 3w so that we only have one variable.

2(3w) + 2w = 60

Now we can simply use algebra to solve for w.

6w + 2w = 60

8w = 60

w = 7.5

Now that we know the value of w we can find the value of l since we know 1l = 3w.

l = 3w

l = 3(7.5)

l = 22.5

The length of the fence is 22.5ft and the width of the fence is 7.5ft.

Answer:

The specific heat of aluminium is 0.8792 J/g °C  or 0.21 Cal/g °C

Explanation:

Step 1 : Write formule of specific heat

Q=mcΔT

with Q = heat transfer (J)

with m = mass of the substance

with c = specific heat ⇒ depends on material and phase ( J/g °C)

with ΔT = Change in temperature

For this case :

Q = 1680 Calories = 7033.824 J ( 1 calorie = 4.1868 J)

m = 100.0g

c= has to be determined

ΔT = 100 - 20 = 80°C

Step 2:  Calculating specific heat

⇒ via the formule Q=mcΔT

7033.824 J = 100g * c * 80

7033.824 = 8000 *c

c = 7033.824 /8000

c = 0,879228 J/g °C

or 0.21 Cal / g°C

The specific heat of aluminium is 0.8792 J/g °C  or 0.21 Cal/g °C

Final answer:

The specific heat of a metal can be found using the formula Q = mcΔT, which is rearranged to c = Q / (mΔT) to solve for c. For the 100.0 g sample of aluminum that released 1680 calories when cooled from 100.0°C to 20.0°C, the specific heat is calculated to be 0.21 cal/g°C.

Explanation:

To find the specific heat of a metal, you can use the formula Q = mcΔT, where Q is the heat absorbed or released in calories, m is the mass in grams, c is the specific heat capacity in cal/g°C, and ΔT is the change in temperature in degrees Celsius (°C).

In this case, we are given that a 100.0 g sample of aluminum released 1680 calories when cooled from 100.0°C to 20.0°C. The change in temperature (ΔT) is 100.0°C - 20.0°C = 80.0°C.

We can rearrange the formula to solve for c:
c = Q / (mΔT). Plugging in the given values:

c = 1680 cal / (100.0 g × 80.0°C)

After doing the calculation:

c = 1680 cal / 8000 g°C

c = 0.21 cal/g°C

So the specific heat of the metal is 0.21 cal/g°C.

The maximum number of electrons that can occupy the third (n=3) shell is 18

Answer: Option E

Explanation:

Every shell can only have a certain number of electron: the first shell have up to 2 electrons, the second have up to 8 (2 + 6) electrons, up to eighteen electron for third shell like (2+6+10), etc. The formula to calculate is,

For nth shell, it can generally contain up to [tex]2 n^{2}[/tex] electrons.

We make use of the formula [tex]2 n^{2}[/tex] where “n” is the number of the shell, to find the number of electrons a shell occupies.

So, if n=3 then using the value in the formula, we have [tex]2 \times 3 \times 3=18[/tex] electrons . Hence, third shell holds up to 18 electrons.

The maximum number of electrons that can occupy the third (n=3) shell is 18. Option E is correct.

The maximum number of electrons that can occupy a given electron shell can be calculated using the formula [tex]2n^2,[/tex]where "n" is the principal quantum number of the shell. For the third shell (n=3), the maximum number of electrons would be:

[tex]2 * 3^2[/tex]= 18

The maximum number of electrons that can occupy the third (n=3) shell is 18

Therefore, Option E is correct.

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Answer:

3700 mL; 3700 cm³

Explanation:

1. Volume in millilitres

[tex]V =\text{3.70 L} \times \dfrac{\text{1000 mL}}{\text{1 L}} = \text{ 3700 mL}[/tex]

2. Volume in cubic centimetres

1 mL = 1 cm³, so

[tex]V = \text{3700 mL} \times \dfrac{1\text{ cm}^{3}}{\text{1 mL}} = \text{3700 cm}^{3}[/tex]

The volume of the liquid in mL is 3700mL and in cm3 is 3700 cm3.

First, to change the unit of a value from liters to milliliters, it is necessary to follow the following relationship:

                                           [tex]1 L = 1000mL[/tex]

Thus, the calculation can be performed:

                                           [tex]3.70L \times 1000 = 3700 mL[/tex]

Finally, to change the unit from mL to cm3 we have:

                                           [tex]1 cm^{3} = 1 mL[/tex]

                                         [tex]3700 mL \times 1 = 3700 cm^{3}[/tex]

So, the volume of the liquid in mL is 3700mL and in cm3 is 3700 cm3.

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Answer:

Answer : A

Explanation:

O

A baseball flying tough the air at 90 miles per hour

These are three questions each with its complete answer.

Question 1. Something must have mass in order to create change.

A. True

B. False

Answer:

Explanation:

Two counter examples will prove that the statement is false.

Neither light nor fire have mass, so they are not considered matter, but yet both can create changes.

Light is an electromagnetic wave, so it is energy, and as such it, of course, can cause some changes. One example are the chemical reactions, like photosynthesis, which require light to happen.

Ligth may also be described either as quanta named photons. Although photons behave like particles they do not have mass.

So, that example contradicts the statement that something must have mass in order to create change.

Fire also contradicts the statement. Fire is a manifestation of energy, it does not have mass, and sure you know how fire create changes in living and no living things.

Question 2. Powdered medicine fills a pill capsule. Which of the following is the best description of the state of the powder?

A. It is a solid because all powders are solid.

B. It is a gas because it takes up the entire volume of the pill capsule.

C. It is a liquid because it does not hold a definite shape.

Answer: the best description is the choice A:

Explanation:

Indeed, although sometimes the powder may be very fine (dust), yet it is not liquid or gas. Powders are always solid.

There are four main states of matter: solid, liquid, gas, and plasma.

Liquids are able to take the form of the container but do not occupy the entire container. Gases do occupy the entire container.

When powder is very fine it could resemble some properties of liquid, but the structure of powders is not crystaline, this is it is not an ordered arrangement. The structure of powders is an ordered arrangement, so powders are solids and not liquids.

It is easy to discard that a powdered medicine could be a gas, because it definetly do not occupy the entire volume of the pill capsule.

Question 3. Find an example of something that you do NOT know the state of. Describe it, and tell me your best guess of what state it is. Explain your guess.

Answer:

Two examples come to my mind:

Explanation:

I will use the example of Nutella to complete the answer.

Nutella is not a gas because when you open the jar it will not escape and fill the room around it.

When you put Nutella in a plate it will not flow over the whole plate, is it a solid ? But yet you can spread it easyly over a cookie. Is it a liquid?

So, Nutella behaves like a solid until you apply some force over it and then it seems a liquid.

I would guess that pastes are solids because they should have an inner structure that keep the particles together.

If you do some research you will find that pastes are neither liquid nor solids, they are named gels. And gels may be seen as a dispersion of molecules of a liquid within a solid, i.e. in liquid particles dispersed in the solid medium

This sure meets the requirements of this question.

Final answer:

2 x 10²² atoms of copper take up a volume of approximately 1.44 x 10²¹ cubic meters.

Explanation:

Copper atoms are incredibly small, and a single copper penny contains approximately 2 x 10²² copper atoms. To calculate how much space these atoms take up, we need to consider their mass and volume. The atomic mass of copper is 63.54 g/mol, and the density of copper is 8.80 x 10³ kg/m³. Using these values along with Avogadro's number (6.02 x 10²³ atoms/mol), we can calculate the volume occupied by 2 x 10²² atoms of copper.

First, we calculate the mass of 2 x 10²² atoms of copper:

Mass = Number of atoms x Atomic mass = 2 x 10²² x 63.54 g/mol = 1.27 x 10²⁴ g

Next, we use the density of copper to calculate the volume:

Volume = Mass / Density = 1.27 x 10²⁴ g / (8.80 x 10³ kg/m³ x 1000 g/kg) = 1.44 x 10²¹ m³

Therefore, 2 x 10²² atoms of copper take up a volume of approximately 1.44 x 10²¹ cubic meters.

Answer:

17/15 x 2/11 = 34/165

d because they want to detemine the cause of bacterial growth

Answer:

im guessing D

Explanation:

Answer:

28.497 cm3

Explanation:

Formula

D=m/v

Given data:

density = 19.3g/cm3

mass = 550 g

Now we will put the values in formula:

V=m/d

V=550 g/ 19.3 g/cm3  = 28.497 cm3

So the volume of gold is 28.497 cm3.

Answer:

D) Titanium-22

Explanation:

Titanium is one of the transition metal elements. It is the 22nd element on the periodic table.

From the statement of the problem:

  A  is the mass number of the unknown atom which is 49. The mass number is the number of protons and neutrons in the nucleus of the atom.

   Z is the atomic number of the unknown atom which is 22. The atomic number is the number of protons in an atom. It is the same as the number of electrons for a neutral atom.

To identify the element, we simply use the atomic number because the periodic table of element is a function of the atomic number Therefore, the element with atomic number 22 on the periodic table is Titanium.

Answer:

The answer is SiO2

Explanation:

Silocon dioxide is written without a 1 after the silocon and with a 2 after the oxygen.

Answer:

1.62 × 10²⁴ atoms are in 52.3 g of lithium hypochlorite.

Explanation:

To find the amount of atoms that are in 52.3 g of lithium hypochlorite, we must first find the amount of moles. We do this by dividing by the molar mass of lithium hypochlorite.

52.3 g ÷ 58.4 g/mol = 0.896 mol

Next we must find the amount of formula units, we do this be multiplying by Avagadro's number.

0.896 mol × 6.02 × 10²³ = 5.39 × 10²³ f.u.

Now to get the amount of atoms we can multiply the amount of formula units by the amout of atoms in one formula unit.

5.39 × 10²³ f.u. × 3 atom/f.u. = 1.62 × 10²⁴ atoms

1.62 × 10²⁴ atoms are in 52.3 g of lithium hypochlorite.

There are 1.62 × 10²⁴ atoms in 52.3 g of lithium hypochlorite.

First, we will convert 52.3 g to moles using the molar mass of LiClO (58.4 g/mol).

[tex]52.3 g \times \frac{1 mol}{58.4 g} = 0.896 mol[/tex]

Then, we will convert 0.896 moles to molecules using Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.

[tex]0.896 mol \times \frac{6.02 \times 10^{23} molecule }{1 mol} = 5.39 \times 10^{23} molecule[/tex]

According to the chemical formula, there are 3 atoms in each molecule of  LiClO. The number of atoms in 5.39 × 10²³ molecules of LiClO is:

[tex]5.39 \times 10^{23} molecule \times \frac{3 atom}{1 molecule} = 1.62 \times 10^{24} atom[/tex]

There are 1.62 × 10²⁴ atoms in 52.3 g of lithium hypochlorite.

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Answer:

A physical quantity which is described completely by its mangnitude only is called scalar quantity. lenght distance time and ares are example of scalar quantity

Explanation:

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