Can some one help me with science . I am having a difficult time .

Answer:

0.4167 J/°C.g.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by substance (Q = 2500 J).

m is the mass of the substance (m = 100 g).

c is the specific heat of the substance (c = ??? J/°C.g).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 70°C - 10°C = 60°C).

∵ Q = m.c.ΔT

∴ c = Q/(m.ΔT) = (2500 J)/(100 g)(60°C) = 0.4167 J/°C.g.

The study of the chemical and bond is called chemistry. According to the law of thermodynamics, the heat transfer from the high temperature to the low temperature.

The correct answer to the question is 0.4167.

To solve this problem, we can use the relation:

Q = m.c.ΔT,

where,

Q = m.c.T

After the equation, we can get.

c = [tex]\frac{Q}{(m.T)} = \frac{(2500 J)}{(100 g)(60C)}\\ \\ = 0.4167[/tex]

Hence, the correct answer is 0.4167.

For more information about the heat, refer to the link:-

https://brainly.com/question/4147359

Answer:

3>2>1

Explanation:

Liquid 3 is the densest and liquid 1 is the least dense of all. Liquid 2 would be in the middle as its density lies between that of liquids 1 and 3.

Density can be defined as the mass per unit volume of a liquid.

The more the mass the greater the density. Density increases with increasing mass of solute. We see that density shares a direct proportionality with mass.

In terms of volume, the more the volume of solvents the lesser the density. When we dilute some solutions, we tend to reduce their density. Density shares an inverse relationship with volume.

The densest solutions would go below while the least dense goes up.

Species will be four secondary and tertiary consumers will be 25

Explanation-

Given in the question the number of species is 4 then it will have 8 primary 10 secondary and 10 tertiary consumers.  If this number of primary consumers increases from 8 to 20 consumers then the number of species involved would be 10 { 4x20/8 }

Number of secondary consumers would also be increased and increased value would be 25 { 10x20/8 } then again comes the tertiary number of consumer which also increases. The number of tertiary consumers will increase to 25 { 10x20/8} same as secondary.  

Among the four ecosystems, ecosytem 3 is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be fewer producers in the ecosystem.

Hello There!

South of the equator, some crops grown were beans, cotton, peanuts, peppers, potatoes, coffee, millet and yams

Answer:

Neon lights don't actually change colors.

Explanation:

Neon signs give the illusion of changing color by turning different components of the signs on or off.

Answer:

The color of the light depends on the gas in the tube. Neon lights were named for neon, a noble gas which gives off a popular orange light, but other gases and chemicals are used to produce other colors, such as hydrogen (red), helium (yellow), carbon dioxide (white), and mercury (blue).

Explanation:

those are all the color signs i know this because i did it before

Answer:

1.  C.  distillation

2.  B.  conversion of mechanical energy into nuclear energy

3.  B.  Alpha ray

Explanation:

Answer:

pH = 2.0

Explanation:

To find the pH of a solution, take the -log[H+]. In this case, the -log(9.4 x 10^-3) equals 2.02687 which makes 2.0 when accounting for significant figures.

Answer:

0.0250 g.

Explanation:

∵ no. of moles (n) = mass / molar mass.

∴ mass of Vitamine C = (n)(molar mass) = (0.000142 mol)(176.12 g/mol) = 0.02501 g = 0.0250 g. "three significant figures"

Answer:

The right choice is "wind power requires a lot of space and depends on local weather patterns "

Explanation:

    2. geothermal power requires more land than other power plants  

    3. nuclear power produces small amounts of energy from large masses

So the right choice is "wind power requires a lot of space and depends on local weather patterns "

Answer:

The object will float in water and citric acid.

Explanation:

The object will float, if it is less dense than the substance it is placed in.

The object will sink, if it is more dense than the substance it is placed in.

So, the object will float in water and citric acid.

Answer:

[tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex]

Explanation:

The pressure is constant, so we can use Charles' Law.

[tex]\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}[/tex]

Data:

V₁ = 1.92 × 10³ L; T₁ = 20 °C  

V₂ = ?;                 T₂ = 68 °C

Calculations:

(a) Convert temperatures to kelvins

T₁ = (20 + 273.15) K = 293.15 K

T₂ = (68 + 273.15) K = 341.15 K

(b) Calculate the volume

[tex]\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}[/tex]

The new volume of the gas is [tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex].

Answer:

Water is a compound made up of two elements—hydrogen and oxygen. ... They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. But in many ways they are very different from each other. Hydrogen has the lowest density of all the elements.

Answer:

55.3 g / 100.0 g of water.

Explanation:

The theoretical value is 55.3 g.

Answer:

Element

Explanation:

since electron,neutron,and proton are inside of an atom, the answer would be elements, since elements are made up of atoms, but not present in the atom itself.

Answer:

b

Explanation:

A. heat; light energies

Answer:

the answer is A; firstly heat then heat light.

Answer:

Its B. Just look at google.

Answer:

The number of protons and neutrons in an atom is known as the mass number. C.)

Answer:

Soil

Explanation:

Overcrowding is not considered as environmental effect of deforestation.

Trees provide various advantages to the living beings. It acts as shelter to animal, birds and human beings. It provides various raw materials for the industry. Apart from this it checks the flooding, prevents soil erosion and protects the environment from smog formation.  

Deforestation refers to the process in which many trees are uprooted and destroyed. When trees are harmed it leads to stoppage of advantage caused by them. Overcrowding is not considered as environmental effect of deforestation as it has no relationship with deforestation.

Answer:

A solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

Explanation:

Solids that have a regular and three-dimensional arrangement of constituent particles such as (atoms, molecules, or ions) are known as crystalline solids. A few examples of crystalline solids include sodium chloride, quartz, diamond, etc. There are four types of crystals:

In crystalline solids, particles are arranged in a repeating pattern. They have a regular and ordered arrangement resulting in a definite shape.

Find more information about Crystalline solid here:

brainly.com/question/4795632

Answer:

There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate [tex]\rm Al_2(SO_4)_3[/tex].

Explanation:

What's the empirical formula of aluminum sulfate?

Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.

Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.

The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.

The least common multiple of 2 and 3 is 6. That is:

Pairing three [tex]\rm {SO_4}^{2-}[/tex] ions with two [tex]\rm Al^{3+}[/tex] will balance the charge. Hence the empirical formula: [tex]\rm Al_2(SO_4)_3[/tex].

What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]?

Refer to a modern periodic table for relative atomic mass data:

There are

in one formula unit of [tex]\rm Al_2(SO_4)_3[/tex].

Hence the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]:

[tex]\underbrace{2\times 26.982}_{\rm Al} + \underbrace{3\times 32.06}_{\rm S} + \underbrace{12\times 15.999}_{\rm O} = \rm 342.132\;g\cdot mol^{-1}[/tex].

How many moles of formula units in 6.35 grams of [tex]\rm Al_2(SO_4)_3[/tex]?

[tex]\displaystyle n = \frac{m}{M} = \rm \frac{6.35\;g}{342.132\;g\cdot mol^{-1}} = 0.0186\;mol[/tex].

Answer:

Hi! I hope this will help

you with your question, whether this is an assignment or not. The answer that I

get is 0.033 concentration.

If 0.0025 mol NaNo3 forms

during the reaction, the concentration of NaNO3 in the final solution should be

0.033.

The concentration of NaNO₃ in the final solution, considering the sum of the given volumes, is approximately 0.276 M.

To find the concentration of NaNO₃ in the final solution, we need to know the volume of the solution. However, since it's not provided in the question or the additional information, we'll assume that the final volume of the solution is the sum of the volumes given in the reference information (0.2L from Na+ and 50mL + 40mL for NO₃).

Step 1: Convert mL to Liters for NO₃ since the concentrations are in Molarity (moles/liter). Therefore, the total volume in liters is 0.2L + 0.05L + 0.04L = 0.29L.

Step 2: We know from the information given that 0.08 mol of NaNO3 is produced. Since this is less than the stated 0.0025 mol, we will use 0.08 mol as the correct value.

Step 3: Calculate the concentration in moles/Liter (Molarity) using the formula C = n/V, where 'C' is concentration, 'n' is the number of moles, and 'V' is the volume in liters. This gives us C = 0.08 mol / 0.29 L = approx 0.276 M NaNO₃.

The concentration of NaNO₃ in the final solution is approximately 0.276 M.

Answer:

A

Explanation:

Answer:

A) standard heat of formation

Explanation:

E is the correct answer because both endothermic and exothermic reactions require activation energy. the reactants have less potential energy than do the products. Energy must be input in order to raise the particles up to the higher energy level.

Answer:

C. Forming the activated complex requires energy,

Explanation:

For any reaction (whether exothermic or endothermic) the reactant molecules need some minimum amount of energy known as Threshold energy.

Reactant molecules have some internal energy and they require some extra amount of energy to reach the threshold energy which is known as activation energy.

This activation energy is required to from an activated complex.

The activated complex is formed where reactant molecules come closer to each other and undergo effective collision. This causes the formation of products.

The new pressure of helium gas assuming constant temperature is equal to 1610.26 Torr.

Given the following data:

Conversion:

Initial volume = 235 mL to L = [tex]\frac{235}{1000} = 0.235\;L[/tex]

To determine the new pressure assuming constant temperature, we would apply Boyle's law:

Mathematically, Boyle's law is given by the formula;

[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]788\times 0.235 = P_2 \times 0.115\\\\185.18 = 0.115P_2\\\\P_2 = \frac{185.18}{0.115} \\\\P_2 =1610.26\; Torr[/tex]

Find more information: https://brainly.com/question/1437490

The new pressure assuming constant temperature would be 1610.43 torr.

Given values:

Goal: Find the new pressure (P₂) in torr.

Ideal Gas Law:

Therefore, the new pressure assuming constant temperature would be 1610.43 torr.

Answer:

Explanation:

The changes that matter undergoes are associated with properties.

A physical change is one that alters the physical properties of matter. The physical properties of matter tells us everything about what a substance is when no change is occurring to its constituents. Such properties can be observed with our senses or instruments or pieces of apparatus. Examples are state of matter, colour, odour, taste, texture etc.

In many ways, physical changes are easily reversible and required little energy to initiate. There is no change in mass and no new kinds of matter are produced.

Examples of physical changes are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking of glass, cutting of wood.

Answer: Volume and temperature

Explanation:

Answer:

volume and temperature

Explanation:

Answer:

The number and the kinds of atoms in the compound

Explanation:

Answer:

Explanation:

Hydrogen is a nonmetallic, colorless gas under ordinary conditions. It becomes an alkali metal under extreme pressure.

Atomic Number: 1

Symbol: H

Atomic Mass: 1.008

Electron Configuration: 1s1

Group: group 1, s-block, nonmetal

Helium is a light, colorless gas that forms a colorless liquid.

Atomic Number: 2

Symbol: He

Atomic Mass: 4.002602(2)

Electron Configuration: 1s2

Group: group 18, s-block, noble gas

Lithium is a reactive silver metal.

Atomic Number: 3

Symbol: Li

Atomic Mass: 6.94 (6.938–6.997)

Electron Configuration: [He] 2s1

Group: group 1, s-block, alkali metal

Beryllium is a shiny gray-white metal.

Atomic Number: 4

Symbol: Be

Atomic Mass: 9.0121831(5)

Electron Configuration: [He] 2s2

Group: group 2, s-block, alkaline earth metal

Boron is a gray solid with a metallic luster.

Atomic Number: 5

Symbol: B

Atomic Mass: 10.81 (10.806–10.821)

Electron Configuration: [He] 2s2 2p1

Group: group 13, p-block, metalloid

Carbon takes several forms. It's usually a gray or black solid, although diamonds may be colorless.

Atomic Number: 6

Symbol: C

Atomic Mass: 12.011 (12.0096–12.0116)

Electron Configuration: [He] 2s2 2p2

Group: group 14, p-block, usually a nonmetal although sometimes considered a metalloid

Nitrogen is a colorless gas under ordinary conditions. It cools to form a colorless liquid and solid forms.

Atomic Number: 7

Symbol: N

Atomic Mass: 14.007

Electron Configuration: [He] 2s​2 2p3

Group: group 15 (pnictogens), p-block, nonmetal

Oxygen is a colorless gas. Its liquid is blue. Solid oxygen may be any of several colors, including red, black, and metallic.

Atomic Number: 8

Symbol: O

Atomic Mass: 15.999 or 16.00

Electron Configuration: [He] 2s2 2p4

Group: group 16 (chalcogens), p-block, nonmetal

Fluorine is a pale yellow gas and liquid and bright yellow solid. The solid may be either opaque or translucent.

Atomic Number: 9

Symbol: F

Atomic Mass: 18.998403163(6)

Electron Configuration: [He] 2s2 2p5

Group: group 17, p-block, halogen

Neon is a colorless gas that emits a characteristic orange-red glow when excited in an electric field.

Atomic Number: 10

Symbol: Ne

Atomic Mass: 20.1797(6)

Electron Configuration: [He] 2s2 2p6

Group: group 18, p-block, noble gas

Sodium is a soft, silvery-white metal.

Atomic Number: 11

Symbol: Na

Atomic Mass: 22.98976928(2)

Electron Configuration: [Ne] 3s1

Group: group 1, s-block, alkali metal

Magnesium is a shiny gray metal.

Atomic Number: 12

Symbol: Mg

Atomic Mass: 24.305

Electron Configuration: [Ne] 3s2

Group: group 2, s-block, alkaline earth metal

Aluminum is a soft, silver-colored, nonmagnetic metal.

Atomic Number: 13

Symbol: Al

Atomic Mass: 26.9815385(7)

Electron Configuration: [Ne] 3s2 3p1

Group: group 13, p-block, considered a post-transition metal or sometimes a metalloid

Silicon is a hard, blue-gray crystalline solid that has a metallic luster.

Atomic Number: 14

Symbol: Si

Atomic Mass: 28.085

Electron Configuration: [Ne] 3s2 3p2

Group: group 14 (carbon group), p-block, metalloid

Phosphorus is a solid under ordinary conditions, but it takes several forms. The most common are white phosphorus and red phosphorus.

Atomic Number: 15

Symbol: P

Atomic Mass: 30.973761998(5)

Electron Configuration: [Ne] 3s2 3p3

Group: group 15 (pnictogens), p-block, usually considered a nonmetal, but sometimes a metalloid

Sulfur is a yellow solid.

Atomic Number: 16

Symbol: S

Atomic Mass: 32.06

Electron Configuration: [Ne] 3s2 3p4

Group: group 16 (chalcogens), p-block, nonmetal

Chlorine is a pale yellow-green gas under ordinary conditions. Its liquid form is bright yellow.

Atomic Number: 17

Symbol: Cl

Atomic Mass: 35.45

Electron Configuration: [Ne] 3s2 3p5

Group: group 17, p-block, halogen

Argon is a colorless gas, liquid, and solid. It emits a bright lilac-purple glow when excited in an electric field.

Atomic Number: 18

Symbol: Ar

Atomic Mass: 39.948(1)

Electron Configuration: [Ne] 3s2 3p6

Group: group 18, p-block, noble gas

Potassium is a reactive, silvery metal.

Atomic Number: 19

Symbol: K

Atomic Mass: 39.0983(1)

Electron Configuration: [Ar] 4s1

Group: group 1, s-block, alkali metal

Calcium is a dull silver metal with a faint yellowish cast.

Atomic Number: 20

Symbol: Ca

Atomic Mass: 40.078(4)

Electron Configuration: [Ar] 4s2

Group: group 2, s-block, alkaline earth metal

Hope That Helps!

Brainliest?

(the other person copied it from Google).

Answer:

Solar eclipse

Explanation:

Answer : A light year is approximately 9.5 trillion kilometers - A)

Answer:

the answer is A) 9.5 trillion kilometers

Explanation:i got you ny g m

Answer:

16.82 L.

Explanation:

where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).

V is the volume of the gas in L (V = ??? L).

n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).

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

T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).

∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.