please help
I need I badly or I'm going to fail
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Answer:

A smaller temperature difference causes a smaller heat transfer

Explanation:

The greater the temperature difference, the greater the rate at which heat transfers.

Answer:

chemical reactions

Explanation:

Answer:

chemical reactions

Explanation:

Chemical reactions like weathering can cause rock and earth movement, plants grow from rain which is weathering, snow is weathering and cold winters is freezing water. I don't see how flowing water can contribute to weathering because in rivers, creeks, etc, always flowing. So if flowing water is always moving, it's not caused by weathering.

I EDITED MY ANSWER:

Physical weathering is caused by purely mechanical changes to the rock, while chemical weathering is caused by chemical reactions. The answer is chemical reactions

Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual mass = 35 g

error = 35 - 33.95 = 1.05

We have

[tex]p(\%) = \frac{1.05}{35} \times 100 \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

The reaction is at equilibrium.

Explanation:

In thermodynamics, the Gibbs free energy is a term used traditionally to refer to the available or  useful work that can be obtained from a thermodynamic system.

Gibbs free energy is a measure of the chemical potential that a reaction has left to do work. Hence, if the free energy is zero, then the reaction has attained equilibrium, and there is no more work to be done

The statement that should be true related to the reaction should be that it should be at equilibrium.

In terms of thermodynamics, this energy should be applied for the availability or the useful work that should be obtained via the system of thermodynamics.

Also, it determined the chemical potential where the reaction has left for doing the work. Also in the case when the free energy should be zero so here the reaction should be attained the equilibrium.

hence, the option b is correct.

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Answer:

[tex]k=2.45M^{-2}s^{-1}[/tex]

Explanation:

Hello.

In this case, considering the given specific orders of reaction, we can write the rate law as:

[tex]r=k[A][B]^2[/tex]

Thus, considering the concentrations of A and B to be 0.200 M and 0.350 M respectively and a rate of 0.060 M/s, the rate constant turns out:

[tex]k=\frac{r}{[A][B]^2}\\ \\k=\frac{0.060M/s}{(0.200M)(0.350M)^2} \\\\k=2.45M^{-2}s^{-1}[/tex]

This is what we know as a third-order reaction since the specific orders both add to 3.

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Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Hope this helps!

Answer:

Proteins are carbohydrates that come from nutritious food.

They are one of the four main carbohydrates.

This is a simple definition of the word proteins.

Hope this helps!

Answer:

Does the article contain facts or only opinions

Got it right on edg.

Answer:

B) Does the article contain facts or only opinions?

Explanation:

Answer:

A. cooling causes condensation

Explanation:

air is cooler at higher altitude in the troposphere.

All matter has thermal energy because atoms are constantly in motion, due to motion all matter possess a kinetic energy. The total kinetic energy is known as thermal energy.

The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes

Thermal energy and temperature are closely related. Both reflect the kinetic energy of moving particles of matter. However, temperature is the average kinetic energy of particles of matter, whereas thermal energy is the total kinetic energy of particles of matter.

It increases or decreases only when the velocity changes, heavier objects, It can transform into other types of energy. It will occur regardless of the moving object's direction of travel.

Thus, all matters has thermal energy because atoms are constantly in motion.

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Answer:

d. ii and iii

Explanation:

Both the Bohr model and the wave (quantum) mechanical  models of the atom recognize the principal quantum number n. The principal quantum number shows the shell or energy level where an electron may be found.

The energy levels are arranged in increasing order of magnitude. That is n=1 >n=2=n=3 etc

Explanation:

hope it helps :)

Answer:

6.38

Explanation:

line up the decimals

it helps to add another 0 to 2.6 so that you can align them better

1

2.60

+ 3.78

= 6.38

8 + 0 = 8

6 + 7 = 13; write 3 and carry the one over above the 2 in 2.60

2 + 3 + 1 = 6

I tried my best to show it through text.

Answer:

39270 J

Explanation:

The quantity of heat required to raise the temperature of a substance from its initial temperature to its final temperature is given by:

Q = mCΔT

m = mass of substance, C = specific heat capacity of substance, ΔT = temperature change = final temperature - initial temperature

Melting point = 0°C, boiling point = 100°C, m = 93.5 g = 0.0935 g, ΔT = boiling point - melting point = 100 - 0 = 100°C, C = 4200 J/kg°C

Q = mCΔT

Q = 0.0935 × 4200 × 100 = 39270 J

195 g×

1 mol

Ni(OH)

2

92.71

g Ni(OH)

2

×

6.022×

10

23

formula units

mol

=1.27×

10

24

formula units of Ni(OH)

2

Since there are  

5

atoms—one  

Ni

atom, two atoms of  

O

and two atoms of  

H

—in each formula unit of  

Ni(OH)

2

,

we multiply the number of formula units calculated above by  

5

:

1.27×

10

24

formula units of Ni(OH)

2

×

5 atoms

formula unit of Ni(OH)

2

=6.33× 10^ 24  total atoms  

The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex]  is[tex]6.30\times 10^{24}[/tex] atoms

Explanation:

Given:

The 195 grams of nickel(II) hydroxide,[tex]Ni(OH)_2[/tex] .

To find:

The total number of atoms in 105 grams of nickel(II) hydroxide.

Solution:

The mass of nickel(II) hydroxide = 195 g

The molar mass of nickel(II) hydroxide = 92.708 g/mol

The moles of nickel(II) hydroxide:

[tex]=\frac{195 g}{92.708 g/mol}=2.10 mol[/tex]

According to the mole concept:

1 mole =[tex]N_A=6.022\times 10^{23} mol^{-1}[/tex]

The number of molecules of nickel(II) hydroxide =

[tex]N=2.10 mol\times 6.022\times 10^{23} mol^{-1} =1.26\times 10^{24} molecules[/tex]

In 1 molecule of nickel(II) hydroxide there is 1 nickel atom, then in N molecules of nickel(II) hydroxide:

[tex]=1\times 1.26\times 10^{24} atom=1.26\times 10^{24} atoms[/tex]

In 1 molecule of nickel(II) hydroxide there are 2 oxygen atoms, then in N molecules of nickel(II) hydroxide:

[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]

In 1 molecule of nickel(II) hydroxide there are 2 hydrogen atoms, then in N molecules of nickel(II) hydroxide:

[tex]=2\times 1.26\times 10^{24} atom=2.52\times 10^{24} atoms[/tex]

The total number of atoms:

[tex]=1.26\times 10^{24} atoms+2.52\times 10^{24} atoms+2.52\times 10^{24} atoms=6.30\times 10^{24} atoms[/tex]

The number of total atoms in 195 grams of [tex]Ni(OH)_2[/tex]  is[tex]6.30\times 10^{24}[/tex] atoms.

Learn more about the mole concept here:

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Answer:

0.00310

Explanation:

Answer:

At equal concentration of HBCG and BCG^-, the colour is green. This colour first appears at pH = 3.8

Explanation:

HBCG is an indicator that is prepared by dissolving the solid in ethanol.

Since

Ka=[BCG−][H3O+][HBCG]When [BCG-] = [HBCG], then Ka = [H3O+].

If pH = 3.8

Ka= [H3O+] = -antilog pH = -antilog (3.8)

Ka= 1.58 ×10^-4

Answer:

b

Explanation:

jus bc

Fluorine F₂ is the correct formula for two atoms in sharing of electrons as they have covalent bond among them. Therefore, option (A) is correct.

A covalent bond is created through sharing of electrons between different or the same kinds is known as a covalent Bond.

A covalent bond has equal sharing of electrons among bonded atoms. The pair of electrons which is shared between atoms is known as shared pair.

Sharing of electrons will help atoms to attain stability in their valence shell as noble gases. Atoms share their electrons with the other atoms in a way so that both atoms can gain octet configuration in their valence shell.

The bond between two fluorine atoms is a covalent bond formed by sharing of electrons. The Bond between sodium and chlorine in NaCl, KBr, and CaCl₂ is an ionic bond formed by the complete transfer of electrons.

Learn more about the covalent bond, here:

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Answer: Sieving

Im 100% sure its the answer!

Answer:

solider liquid and gas plasma

Explanation:

in physical a state of matter is one of the distant form in which matter can exist four states of matter are observable in everyday life solid liquid and gas and plasma. hope it helps

In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.

Answer:

CO2 is a green house gas

Explanation:

CO2 is believed to act as a canopy over the earth's surface absorbing infrared (heat ray) from the earth and re-emitting it  back to the earth.

By so doing, temperature is increased and more frozen CO2 will defrost causing even greater temperature rise.

The gradual rise in the earth's temperature is known as global warming.

Answer:

D e

Explanation:

Answer:

The given metal sample is not aluminum because its density is 3.0 g/cm³ while density of aluminum is  2.7 g/cm³.

Explanation:

Given data:

Density of aluminum = 2.7 g/cm³

Mass of metal sample = 52.0 g

Volume of metal sample = 17.1 cm³

which sample is that = ?

Solution:

The given problem will be solve through density formula.

d = m/v

d = density

m = mass

v= volume

Now we will put the values in formula.

d = 52.0 g/ 17.1 cm³

d = 3.0 g/cm³

It is given in question the density of aluminum is 2.7 g/cm³. The given metal sample is not aluminum because its density is 3.0 g/cm³.

Answer:

The solution is acidic.

Explanation:

Answer:

d

Explanation:

d is the right answer since gases do not have definite shape and volume and liquids have definite volume. so liquid cannot change its volume but gas can

Explanation:

Mass, is amout of matter contained in body

it value remain constant

it cannot be zero

weight is gravitational force which attract body towards centre of earth

it value changes

it can be zero

Answer:

Correct option is ₂⁴He

Explanation:

Uranium-238 undergo alpha decay and produce Th-234 and alpha particle.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. It is also called helium nuclei. When atom undergoes the alpha emission the parent atom converted into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom.

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

An atomic orbital is a mathematical feature describing the region and wave-like behavior of an electron in an atom. This characteristic can be used to calculate the opportunity of finding any electron of an atom in any precise location across the atom's nucleus.

An atomic orbital is regularly idea of as a location of space wherein there is an excessive opportunity of finding an electron. Every energy level corresponds to an orbital of a one-of-a-kind form, which describes wherein the electron is probable to be observed.

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Answer:

electron

Explanation:

Answer:

C₂ = 0.60 M

Explanation:

Step 1: Given data

Step 2: Calculate the concentration of the diluted dextrose solution

We will use the dilution rule.

C₁ × V₁ = C₂ × V₂

C₂ = C₁ × V₁ / V₂

C₂ = 1.0 M × 15 mL / 25 mL

C₂ = 0.60 M