Why is it important for scientists to use common units such as the metric system?
A. so they can effectively communicate their findings
B. so they can double check their data
C. so they can form similar hypotheses
D. so they can conduct controlled experiments

Answer:

MgBr

NaCl

Explanation:

All types of energy can be resumed into two basic types of energy which include kinetic energy and potential energy.

Energy is the ability to perform a given work. Kinetic energy is energy in movement, whereas potential energy is stored energy.

For example, plant photosynthesis makes reference to chemical energy (potential energy), popcorn makes reference to thermal energy, etc.

In conclusion, all types of energy can be resumed into two basic types of energy which include kinetic energy and potential energy.

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The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

Aluminum chloride is useful for the treatment of palmar, plantar, and axillary hyperhidrosis.

Aluminum chloride has also been reported to be useful in facial and scalp hyperhidrosis

The balanced chemical equation represents the mole ratio in which the chemicals combine.

In this case, illustrates that 2 mol Al produces 2 mol Al Cl₃, hence these 2 chemicals are in a 1:1 ratio.

Thus, to produce 8.70 mol aluminium chloride, it will require 8.70 mol aluminium.

But this quantity of Al has a mass in grams of

m = n × Mr

   = 8.70 mol × 27g/mol

   = 234.9 g

Hence, The weight of aluminum are required to produce 8.70 moles of aluminum chloride is 234.9 g

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What is the increment of change in a series of straight-chain alkanes?

CH

CH3

CH4

CH2

Answer:

CH2

Answer:

.6 M

Explanation:

.45 moles / .750 liters = .6 M

Answer:

C

Explanation:

chem ed 2022

When a solid is dissolved into a liquid,

So, option C is correct is one.

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The  o-xylene, m-xylene, and p-Xylene are constitutional isomers. The correct option is D.

Isomers are the elements or polyatomic elements that have similar molecular formula.

All options are attached here:

A.optical isomers

B.structural isomers

C.geometric isomers

D.constitutional isomers

Thus, the correct option is D.constitutional isomers.

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The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

A beta minus decay is one in which an electron is changed into a proton. The atomic number of the daughter nucleus will increase by one unit and is one place after the parent in the periodic table.

The chemical element that is formed when I-131 undergoes beta-minus decay is Xe.

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Answer: a gas

The gas phase is the phase where particles are packed the least tightly together.

Both the samples can be used to make inferences about the population.

A non-normal distribution is when the data is concentrated on one side with decreasing amount streaming off to the left or right side

It is given in the question that

Total number of population = 25000

% of a sample of Jason = 0.24%

% of the sample of Yolanda's = 0.32%

According to the Jason's Sample

the number of the population  is given by

0.24 * 25000 / 100

60

According to the Yolanda's Sample

The number of the population is given by

0.32 * 25000 / 100

80

Both the samples can be used to make inferences about the population.

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Answer:

The cathode reaction is NiO2+H2O+2e−→Ni(OH)2+2OH−.

Answer: 18 g

Explanation:

[tex]0.12=\frac{\text{mass of NaCl}}{140}\\\text{mass of NaCl}=(0.12)(140)=16.8 \text{ g}[/tex]

The option closest to this is 18 g

The other students in the lab should be notified next in this type of scenario.

This is a substance which donates protons and is very corrosive. It also turns blue litmus paper red.

When it was spilled and baking soda was used to neutralize it on the floor , it is best to inform the other students too so as to prevent them from being exposed by mistake thereby reducing risk of injury.

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Answer:

The solid has broken down into pieces so small that its particles spread all throughout the new mixture.

Answer:

Hollow bones allow the birds to fly. They're quite dense, and that density allows for flight! Because we humans do not have hollow bones, our bodies are much too heavy to fly on our own. If we did, we'd probably be able to fly.

Explanation:

Answer:

The concept of the atom (Greek: atomos, "indivisible"), an indivisible particle of matter, goes back to ancient Greece and a man named Democritus, a rival of Aristotle. Democritus held that all matter could be subdivided only until some finite particle was reached.Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties. Dalton based his theory on the law of conservation of mass and the law of constant composition. The first part of his theory states that all matter is made of atoms, which are indivisible.Atomic theory established that all matter is made of tiny particles, a discovery that led to amazing scientific breakthroughs in areas from modern chemistry to nuclear energy.Atomic models are important because, they help us visualize the interior of atoms and molecules, and thereby predicting properties of matter.This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of their experiments were a surprise and they did not fit with the existing model. Scientists changed the model so that it could explain the new evidence.Atomic theory originated as a philosophical concept in ancient India and Greece. The word "atom" comes from the ancient Greek word atomos, which means indivisible. According to atomism, matter consists of discrete particles. However, the theory was one of many explanations for matter and wasn't based on empirical dataEverything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass. Compounds are produced through different whole-number combinations of atoms.Dalton's atomic theory suggested that the atom was indivisible and indestructible. But the discovery of two fundamental particles (electrons and protons) inside the atom, led to the failure of this aspect of Daltons atomic theory.

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Answer: B) the answer is CD with the line on top

Explanation:

Answer:

green n yellow and white and black and white sq

Answer:

propa-1-nol

Explanation:

easy clapp

[tex]SrBr_{2}[/tex]

Chemical formulas are a way to show the elements and the amount of each element present in a compound.

Element Symbol

To write a chemical formula you need to use their chemical symbols. So, we need to find the symbols for strontium and bromide.

Charges

However, elements do not combine in random ratios. The ratios are based on charges so that all compounds have a neutral charge. Elements will have different subscripts to ensure that compounds have a neutral overall charge. So, to correctly write the formula we need to know the charges Sr and Br have when they became ions.

To cancel the positive 2 out, we must have 2 bromines. That means the final formula for strontium bromide is [tex]SrBr_{2}[/tex]. Now, the compound has a charge of 0.

Answer:

Option

Explanation:

Rock is broken into piece but thestate is normal

Answer:

Boil the water and stir in potassium nitrate. If it doesn't all dissolve, you can cook it on the stove or microwave it until the water boils again. Remove the solution from heat, but let it cool slowly for the best crystal formation.

Answer:

HBr + KOH -> KBr + H₂O

Explanation:

Acid-base reactions always produce a salt [KBr] and water [H₂O].

Out of the given reactions, the reaction HBr + KOH -> KBr + H₂O is an acid base reaction.

An acid–base reaction is a chemical reaction that occurs between an acid and a base and results in the formation of salt and water.

Here in this reaction HBr + KOH -> KBr + H₂O, HBr is an acid and KOH is a base, together they undergo a neutralization reaction to form a salt KBr and water .

An acid-base reaction involves the transfer of protons (H⁺) between an acid and a base. Acids are the substances which can donate protons, while bases are substances that can accept protons.

In an acid-base reaction, the acid donates a proton (H⁺) to the base, forming water (H₂O) and a salt. The salt is typically formed by the cation of the base combining with the anion of the acid.

In this reaction, HBr donates a proton (H⁺) to KOH, which acts as a base and accepts the proton to form water (H₂O), while KBr is formed as a salt. This is a classic example of an acid-base reaction, where an acid and a base react to form a salt and water.

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Answer: 80.9 K

Explanation:

[tex]Q=mc \Delta T\\\\1345=(43.2)(0.385) \Delta T\\\\\Delta T=\frac{1345}{(43.2)(0.385)} \approx \boxed{80.9 \text{ K}}[/tex]

Answer:

on the surface of the cathode

Answer:

3)  670.7 °C (nearest tenth)

4)  818.2 torr (nearest tenth)

Explanation:

[tex]\sf \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\quad \textsf{(when pressure is constant and temperature is in kelvin)}[/tex]

where:

Given values:

Convert the temperature in Celsius to kelvin by adding 273.15:

⇒ [tex]\sf T_1[/tex] = 10 + 273.15 = 283.15 K

Substitute the given values into the formula and solve for T₂:

[tex]\implies \sf \dfrac{3}{10}=\dfrac{283.15}{T_2}[/tex]

[tex]\implies \sf 3 \cdot T_2=283.15 \cdot 10[/tex]

[tex]\implies \sf T_2=\dfrac{2831.5}{3}[/tex]

[tex]\implies \sf T_2=943.83333...\:K[/tex]

Converting kelvins back to Celsius:

[tex]\implies \sf T_2=943.83333...-273.15=670.68333...\:C^{\circ}[/tex]

Therefore, the final temperature will be 670.7 °C (nearest tenth).

[tex]\sf \dfrac{P_1}{T_1}=\dfrac{P_2}{T_2}\quad \textsf{(when volume is constant and temperature is in kelvin)}[/tex]

where:

Given values:

Convert the temperature in Celsius to kelvin by adding 273.15:

⇒ [tex]\sf T_1[/tex] = 27 + 273.15 = 300.15 K

⇒ [tex]\sf T_2[/tex] = 50 + 273.15 = 323.15 K

Substitute the given values into the formula and solve for P₂:

[tex]\implies \sf \dfrac{760}{300.15}=\dfrac{P_2}{323.15}[/tex]

[tex]\implies \sf 760 \cdot 323.15=P_2 \cdot 300.15[/tex]

[tex]\implies \sf 245594=300.15 \cdot P_2[/tex]

[tex]\implies \sf P_2=\dfrac{245594}{300.15}[/tex]

[tex]\implies \sf P_2=818.23754...\:torr[/tex]

Therefore, the new pressure is 818.2 torr (nearest tenth).

Answer:

the pH of a solution if h+ 1.0 x 10-9 M

5

Explanation:

Concentration (mol/L)[H3O+]pHpOH1 x 10-8861 x 10-9951 x 10-10104

The overall charge on this atom is zero if the lithium atom has three, protons, three neutrons, and three electrons.

The smallest tiny particles of matter which can't be divided further is called atoms.

The lithium atom is always electrically neutral, ie, it has no charge. A proton has a unit positive charge while an electron has a unit negative charge, an atom has an equal number of protons and neutrons and thus it is electrically neutral.

Hence, the overall charge on this atom is zero if the lithium atom has three, protons, three neutrons, and three electrons.

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Answer: C, 1.68 x 10^-21

Explanation: Edge 2022