Please help me to do this assignment

Answer:

The specific heat capacity of this material is approximately [tex]1.6\; \rm J\cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].

(Assume that there is no energy loss. Assume that the specific heat capacity of water is [tex]4.182\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}[/tex].)

Explanation:

Let [tex]c[/tex] denote the specific heat capacity of a material. Consider a sample of that material with mass [tex]m[/tex]. If the temperature of that objects changes by [tex]\Delta T[/tex], the corresponding energy change would be [tex]Q =c \cdot m \cdot \Delta T[/tex].

Start by finding the amount of energy that water has gained from the [tex]50\; \rm g[/tex] sample.

That [tex]500\; \rm g[/tex] of water would have gained:

[tex]\begin{aligned} & Q(\text{water}) \\ &= c(\text{water}) \cdot m(\text{water}) \cdot \Delta T (\text{water}) \\ &\approx 4.182\; \rm J \cdot g^{-1} \cdot \left(^\circ C\right)^{-1} \times 500\; \rm g \times 3\; \rm ^\circ C \\ &\approx 6.27\times 10^{3}\; \rm J \end{aligned}[/tex].

Assume that the [tex]50\; \rm g[/tex] sample and the [tex]500\; \rm g[/tex] of water were insulated from the surroundings. The energy that water gained would be exactly the same as the energy that the [tex]50\; \rm g\![/tex] sample had released through cooling.

In other words, the [tex]50\; \rm g[/tex] sample has released approximately [tex]6.27 \times 10^{3}\; \rm J[/tex] of energy as it is cooled from [tex]100\; \rm ^\circ C[/tex] to [tex]23\; \rm ^\circ C[/tex].

Rearrange the equation [tex]Q = c \cdot m \cdot \Delta T[/tex] to find an expression for specific heat capacity, [tex]c[/tex]:

[tex]\begin{aligned}c = \frac{Q}{m \cdot \Delta T}\end{aligned}[/tex].

Apply this expression to find the specific heat capacity of the sample:

[tex]\begin{aligned}c(\text{sample}) &= \frac{Q(\text{sample})}{m(\text{sample}) \cdot \Delta T(\text{sample})} \\ &\approx \frac{-6.27\times 10^{3}\; \rm J}{50\; \rm g \times \left(-77\; \rm ^\circ C\right)} \approx 1.6\; \rm J \cdot g^{-1} \cdot {\left(^\circ C\right)}^{-1}\end{aligned}[/tex].

Answer:

A

Explanation:

By nature, a hybrid has one dominante allele and one recessive allele

Answer:

C

Explanation:

In 1953 they made soundings and discovered the ocean ridges

Reduction potential is a measure of the ability of a substance to be reduced

Reduction potential (Eo) can simply be defined as as that tendency of a chemical species or a substance to be reduced by gaining an electron.

Generally, the reduction potential of any chemical species can be determined by subtracting the standard reduction potential for the reaction occurring at the anode from the standard reduction potential for the reaction occurring at the cathode.

So therefore, reduction potential is a measure of the ability of a substance to be reduced

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Answer: c. a measure of the ability of the substance to be reduced

Explanation:

Answer:

Solution - (a) Brine . Suspension - (c) sand and water, (g) chalk and water​ Colloid - (e) air,  (f) smoke , (d) soda , (b) milk

Explanation:

A solution is an homogeneous mixture of two or more compounds.

A suspension is a heterogeneous mixture of two or more compounds while a colloid is a homogeneous mixture of two or more compounds with suspended particles which do not settle.

So, under these definitions, the classifications are as follows-

Solution - (a) Brine .

Suspension - (c) sand and water, (g) chalk and water​

Colloid - (e) air,  (f) smoke , (d) soda , (b) milk

Answer:

I think it B

Explanation:

Answer:

The answer is FTC or C!!!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation:

Answer:

some potassium can be

Explanation:

The force of attraction between these two ions at their equilibrium interionic separation is F = -1.10 x 10⁻⁸.

The force of attraction is when the atoms of two molecules attract one another.

To calculate the attraction (F), we will use Coulomb's Law:

F = k Q1Q2 / r2

where  

Q₁ and Q₂ are the fees on the ions,

r is that the distance between them, and

k = the Coulomb constant

Given the Q₁ = 2+

Q₂ = 1-

r₊ = 0.072 nm

r₋ = 0.133 nm

k = 8.988 × 10⁹ N· m²C⁻²

Q₁ = (+2) × 1.602 × 10⁻¹⁹ C

= +3.204 × 10⁻¹⁹ C

Q₂ = (-1) × 1.602 × 10⁻¹⁹ C

= -1.602 × 10⁻¹⁹ C

r = r₊ + r₋

0.072 nm + 0.133 nm = 0.205 nm

= 0.205 × 10⁻⁹ m

F = -1.10 x 10⁻⁸

Thus, the force of attraction is F = -1.10 x 10⁻⁸.

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Answer: Natural Convection Boiling.

Nucleate Boiling.

Transition Boiling.

Explanation:

Answer:

The first one would be C. The second one would be E. The third one would be B. The fourth one would be D. Lastly, the fifth one would be A.

Answer:

Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.

n the scope of its subject, chemistry occupies an intermediate position between physics and biology.[5] It is sometimes called the central science because it provides a foundation for understanding both basic and applied scientific disciplines at a fundamental level.[6] For example, chemistry explains aspects of plant chemistry (botany), the formation of igneous rocks (geology), how atmospheric ozone is formed and how environmental pollutants are degraded (ecology), the properties of the soil on the moon (cosmochemistry), how medications work (pharmacology), and how to collect DNA evidence at a crime scene (forensics).

Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are two types of chemical bonds: 1. Primary Chemical bonds e.g covalent bonds, in which atoms share one or more electron(s); ionic bonds, in which an atom donates one or more electrons to another atom to produce ions (cations and anions); Metallic bonds and 2. Secondary chemical bonds e.g. hydrogen bonds;Van der Waals force bonds, ion-ion interaction, ion-dipole interaction etc.

Explanation:

need thanks and make me brainiest if it helps you

Answer: one barium atom and two iodine atoms are present in barium iodide

Explanation:

BaI2 is formula of barium iodide

Answer:

The answer is C.  (It delayed or extended nationalist struggles.)

Explanation:

Hope this helps!

Based on the properties of elements, atoms, compounds and mixtures:

Part 1:

Part 2: Oxygen

Part 3:

Elements are pure substances which cannot be split into simpler substances by an ordinary chemical process.

Atoms are the smallest particle of elements that can take part in a chemical reaction.

Compounds are substances composed of two or more elements chemically combined together

Mixtures are substances composed of two or more constituents physically combined together.

Considering the given questions:

Oxygen 15.999

The correct matches are:

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Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 9.8 m/s²

From the question we have

PE = 40 × 9.8 × 10

We have the final answer as

Hope this helps you

The volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.

Density is a measure of the mass of matter contained by a unit volume. The density of a substance can be calculated by dividing the mass of the substance by its volume as follows:

Density = mass ÷ volume

According to this question, 3.5g of hydrochloric acid has a density of 1.49 g/mL. The volume contained in this mass of hydrochloric acid can be calculated as follows:

1.49g/mL = 3.5g ÷ V

V = 3.5 ÷ 1.49

V = 2.35mL

Therefore, the volume of 3.5g of hydrochloric acid that has a density of 1.49 g/mL is 2.35mL.

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Movement of tectonic plates, erosion, earthquakes, and landslides, etc causes a mountains to change in height or location.

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Answer:

3.193 mol

Explanation:

The reaction is

[tex]N_2+3H_2\rightarrow 2NH_3[/tex]

We use the stoichiometry in order to find the moles of nitrogen required.

[tex]9.58\ \text{mol of }NH_3\times \dfrac{1\ \text{mol of }N_2}{2\ \text{mol of }NH_3}[/tex]

[tex]=3.193\ \text{mol of }N_1[/tex]

The amount of nitrogen required is 3.193 mol to produce 9.58 mol of ammonia.

Answer:

D

Explanation:

0 is between 6 and 2 so it's also a significant figure

Answer:B

Explanation:

It’s pretty obvious lol

Answer: Theoretical yield Is what you expect stoichiometrically from a chemical reaction; actual yield is what you actually get from a chemical reaction

Explanation:

When a reaction happens we can have two yields

Theoretical is proved before or stochiometrically tested multiple times and stored as theory which we expect

Actual yields is that which we get actually from our reaction

Answer: 36

Explanation:

Answer:

Jupiter would have the strongest gravitational pull on a satellite.

Gravity is directly proportional to mass.

Jupiter is the most massive, so it will have a stronger gravitational pull.

Explanation:

Answer:

1) The number of the listed compounds that have ionic bonds between them are 5 compounds

2) Their formulas showing their charges within the compounds are;

NaCl ↔ Na⁺+Cl⁻

MgO ↔ Mg²⁺+O²⁻

K₂O ↔ 2K⁺+O²⁻

LiF ↔Li⁺+F⁻

CaO ↔ Ca⁺+O²⁻

3) The major reason they were selected is because they are compounds formed by the combination of a metal and a nonmetal

Explanation:

1) An ionic bond involves the transfer of an atoms valence to another atom, such that the ions formed by the ionic chemical bond will be oppositely charged

Therefore, metals, which are elements that mainly have a few electrons in their outermost shell, loses their valence electrons and become positively charged, while non metals, which require a few electrons to complete the stable octet electronic configuration, receive the electrons from the metallic atoms and become negatively charged

Therefore, the compounds formed between a metal and a nonmetal in the list are the the compounds containing ionic bonds, including

NaCl, MgO, K₂O, LiF, and CaO

Therefore, 5 compounds contain ionic bonds between them;

2) Their formulas are;

NaCl, MgO, K₂O, LiF, and CaO

3) The major reason that the chosen compounds contain ionic bonding between them is because they involve the combination of a metal and a nonmetal as follows;

a) NaCl → Na⁺ (metal ion) + Cl⁻(nonmetal ion)

b) MgO → Mg²⁺ (metal ion) + O²⁻(nonmetal ion)

c) K₂O → 2K⁺ (metal ion) + O²⁻(nonmetal ion)

d) LiF → Li⁺ (metal ion) + F⁻(nonmetal ion)

e) CaO → Ca⁺ (metal ion) + O²⁻(nonmetal ion)

Answer:

A

Explanation:

I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.

To solve this we must be knowing each and every concept related to reflections. Therefore, a pair of jeans look blue because  it reflects blue light.

In physics, reflection usually described as a change in the orientation of a waveform at the interface of two distinct media, bouncing the waveform back onto the original medium.

The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. The color we perceive is primarily determined by how things interact with lighting as well as finally reflect or transfer it to our eyes. A pair of jeans look blue because  it reflects blue light.

Therefore, a pair of jeans look blue because  it reflects blue light.

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Answer:

One mole of calcium is present in one mole of calcium carbonate

Explanation:

Because its formula is CaCO3

Ca contains 2+ charge and CO3 contains 2- charge