I've tried looking it up but I can't find an answer. Please help with this question.

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

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: 36

Explanation:

Answer:

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

Explanation:

Hope this helps!

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

Answer:

There is only one change when transcribing from a DNA sequence to a RNA sequence.  

Explanation:

The change when transcribing is that instead of thymine (T) in a DNA sequence, you have Uracil (U) in a RNA sequence. The rest will stay the same. So, DNA has ATCG, whereas RNA has UACG. There should be NO thymine (T) in your RNA sequence–– it should only include the four of the following: UACG.

[FORMAT]: DNA is to RNA

A is to U (IMPORTANT, NO "T") –– Think as Apples Under the Tree

T is to A –– Think as Trees have Apples

C is to G –– Think as Car in the Garage

G is to C –– Think as Inside the Garage are Cars

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

Explanation:

BaI2 is formula of barium iodide

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:B

Explanation:

It’s pretty obvious lol

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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The temperature of the water and the chromium : 25.122 ° C  

The law of conservation of energy can be applied to heat changes, i.e. the heat received / absorbed is the same as the heat released  

Q in(gained) = Q out (lost)

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Q Chromium= Q water

[tex]\tt 60\times 0.11\times (82-t)=80\times 4.18\times (t-24)\\\\541.2-6.6t=334.4t-8025.6\\\\341t=8566.8\\\\t=25.122^oC[/tex]

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

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Let's take the drop in temperature is - x

expression-> 29-x=16

I have attached the line diagram below.

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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:

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

Answer:

some potassium can be

Explanation:

Answer:

C

Explanation:

In 1953 they made soundings and discovered the ocean ridges

Answer:You didn't provide examples

Explanation: Groundwater can cause erosion under the surface as it moves through the soil. During the movement an acid is formed which what causes erosion and deposition.

Hope that helps

Answer:

D

Explanation:

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

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].

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:

I think it B

Explanation:

Answer:

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

Explanation:

Answer:

500 grams

Explanation:

its because it has more water. The amount of thermal energy available in a substance is proportional to the mass of the substance.

Answer:

Li2SO4

Explanation:

Balance the reaction of Li3PO4 + MgSO4 = Li2SO4 + Mg3(PO4)2 using this chemical equation balancer!

Answer:

A line that is drawn vertically down the earth but is not parallel to the prime Meridian.

Explanation:

A line that is drawn vertically down the earth but is NOT parallel to the Prime Meridian, best describes the meridian of longitude.

Prime Meridian is an imaginary line which divides the earth into eastern and western hemispheres

Meridian of longitude is an imaginary semicircle that runs from north to south direction and joins the two poles. All meridians are of the same length and meet at the poles.

Hence, option 3 is the answer.

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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:

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: Natural Convection Boiling.

Nucleate Boiling.

Transition Boiling.

Explanation: