2. Circle all of the following that change with the temperature of a reaction.

3. Draw an arrow on this graph of the Arrhenius equation that shows where you would find ln A (log of the frequency factor).

4. If the slope of the line in the graph above is -350 K, what is the value of Ea (in J/mol)?

Answer:

calcium ions

Explanation:

Water hardness is due to the presence of calcium ions, and to a lesser extent, magnesium, iron, and manganese.

Answer:

Nitrogen has an atomic number of seven, while the atomic number of oxygen is eight. That means nitrogen has seven protons in the nucleus of each atom, as well as seven electrons surrounding the nucleus. Oxygen has eight protons and electrons. Atoms combine with one another to form molecules.

Answer:

dinitrogen trioxide = N2O3

nitrogen monoxide =  NO

hydrochloric acid = HCl

chloric acid = HClO3

sulfuric acid = H2SO4

sulfurous acid = H2SO3

Answer:

B is the answer

We are in a spiral galaxy but as of late scientists believe we are in a barred-spiral galaxy.

Explanation:

Hope this helped.

A brainliest is always appreciated.

Milky way is a type of  barred-spiral galaxy.

A galaxy is defined as a system of stars, stellar remainings, interstellar gas, dust, dark matter, which are bound together by means of gravity.The word is derived from the Greek word which literally means 'milky',as a reference to the Milky Way galaxy which contains the Solar System.

Most of the mass which is present in a galaxy is present in the form of dark matter, out of which only a few percent of the mass

is visible. Supermassive black holes are a common characteristic which are present at the centres of galaxies.

Galaxies are categorized as per their morphology in the shape of elliptical, spiral, or irregular. Many are believed to have supermassive black holes which are present at their centers. The Milky Way's central black hole which is present , also known as Sagittarius A*, has a mass which is four million times greater than the Sun.

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[tex]\underline{\underline{\large\bf{Given:-}}}[/tex]

[tex]\red{\leadsto}\:[/tex][tex]\textsf{Amount of Methane,} [/tex][tex]\sf CH_4 = 42\:grams [/tex]

[tex]\underline{\underline{\large\bf{To Find:-}}}[/tex]

[tex]\orange{\leadsto}\:[/tex][tex]\textsf{Moles of water produced from reaction } [/tex][tex]\sf [/tex]

[tex]\\[/tex]

[tex]\underline{\underline{\large\bf{Solution:-}}}\\[/tex]

[tex]\sf Molar \:mass \:of \: CH_4 :- [/tex][tex]\sf \implies 1\times (atomic \: mass \:of \:Carbon )+ 4\times [/tex]

[tex]\sf (atomic\:mass \: of \: hydrogen)[/tex]

[tex]\sf \implies 1 \times 12+ 4\times 1 [/tex]

[tex]\sf \implies 16 grams [/tex]

[tex]\green{ \underline { \boxed{ \sf{Moles \: of \: CH_4= \frac{Amount \:of \: CH_4}{Molar \: mass \: of \:CH_4} }}}}[/tex]

[tex]\begin{gathered}\\\implies\quad \sf \frac{42}{16} \\\end{gathered} [/tex]

[tex]\begin{gathered}\\\implies\quad \sf 2.625 moles \\\end{gathered} [/tex]

The balanced reaction for combustion of methane is-

[tex]\green{ \underline { \boxed{ \sf{CH_4+2O_2 \longrightarrow CO_2+2H_2O}}}}[/tex]

By observation-

[tex]\longrightarrow[/tex]Water produced by 1 mole of methane = 2 moles

[tex]\longrightarrow[/tex]Water produced by 2.625 mole of methane = 2 × 2.625

[tex]\quad\implies[/tex] 5.250 moles

Answer:

Explanation:

Nitrogen is a non-mineral

The other 3 are minerals.

So the answer is Nitrogen

Answer:

nitrogen is a non mineral

Answer:

the use of paleontology as a scientific tool

Explanation:

Answer: A forensic paleontologist is a scientist who uses their knowledge of fossils and ancient remains to help solve crimes and investigate mysteries. They apply principles from paleontology, the study of ancient life, to analyze evidence found at crime scenes or archaeological sites.

there are 4 properties of salt

1. The salt of a strong acid and a strong base is neutral

2. The salt of a strong acid and a weak base is acidic

3. The salt of a weak acid and a strong base is basic

4. Salt of a weak acid and a weak base depends on the value of the ionization constant of the acid and base

So the salt from strong acid + weak base is acidic

and salts of strong acids and weak bases (pH<7) or of strong bases and weak acids (pH>7) will be partially hydrolyzed

The relative atomic mass of the metal, M is calculated as 204.4amu.

The relative atomic mass of a isotopic element can be calculated by summing the abundance of each isotope in the element. That is;

(mass no of isotope 1 × % abundance) + (mass no of isotope 2 × % abundance)

According to this question, metal M has two isotopes with the following mass numbers and % abundance:

(30/100 × 203) + (70/100 × 205)

60.9 + 143.5 = 204.4

Therefore, the relative atomic mass of the metal, M is calculated as 204.4amu.

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Answer: It is indeed A.Standard Solution.

Hope this helps you!

To identify why a metal measurement was different in the experiments look for the variable that was different in the experiment and analyze how this change affected the results.

An experiment is a procedure that aims at probing or discovering something. For example, you can test if a plant grows faster/slower by using an experiment.

The most common cause for this situation is that one of the factors or variables is slightly different. For example, if I add 50mL of water to a plant rather than 20mL of water every day this might cause different results.

Based on this, if the metal content was different you should analyze if any of the factors changed in this experiment and find out how this change affected the general results.

Note: This question is incomplete because there is limited information about the experiment; due to this, I answered it based on general knowledge.

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Answer:

Cold air surrounds food and slows the spoiling process

Answer:

Reaction 1: -450 kJ/mol

Reaction 2: -81 kJ/mol

Explanation:

These were the correct answers on Edge, 2022. Hope it helps!

Answer:

-450 and -81 are correct

Explanation:

edge 2022

Answer:

when wood burns

(PLS MARK BRAINLIEST)   (hope it helps!)

Explanation: when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant

Answer:

Aluminium + Dioxygen = Ruby

Reaction Type

Synthesis

Redox (Oxidation-Reduction) Reaction Beta

Al + O2 = Al2O3 might be a redox reaction.

Reactants

Aluminium - Al

13Al Aluminum Element 13

Dioxygen - O2

Lox O₂ Oxygen Oxygen Gas Liquid Oxygen Triplet Oxygen Diatomic Oxygen Molecular Oxygen O2 Bond Polarity

Products

Ruby - Al2O3

Al2O3 Molar Mass Al2O3 Oxidation Number

Exothermic or Endothermic?

Al(s)  4 mol 0 kJ/mol 0 kJ

O2(g)  3 mol 0 kJ/mol 0 kJ

Al2O3(s)  2 mol -1669.8 kJ/mol -3339.6 kJ

ΔH°rxn  -3339.6 kJ

ΣΔH°f(reactants) > ΣΔH°f(products), so the reaction is exothermic.

Explanation:

Explanation:

A physical change can not change the chemical makeup of a substance. If it did, it would be considered a chemical change. It can, however, be physically changed.

Answer:

Look below

Explanation:

The formula for density is:

[tex]Density=\frac{mass}{volume}[/tex]

Therefore in order to find the density of a solid, you must find the mass and the volume first.

To find the mass, you can use a scale.

To find the volume, you can use the water displacement method. For example, if you fill the water of a graduated cylinder to 10 mL, and then you put a rock inside, and it rises to 15 mL, then the volume (of the rock) is 15mL-10mL=5mL.

Answer:

A. dew forms from water vapor in the air

Explanation: As dew formation is spontaneous process, therefore, entropy of the universe will increase.

The theoretical yield of BaCO3 is 5.5

The theoretical yield is the yield calculated from the stoichiometry of the reaction. The equation of the reaction is;

Ba(NO3)2(aq) + Na2CO3 (aq) ------> BaCO3(s) + 2NaNO3(aq)

Number of moles of limiting reactant: 0.4 M × 70/1000 = 0.028 moles

Since the reaction is 1:1,om;y 1 mole of BaCO3 is formed. Hence, mass of BaCO3 = 0.028 moles × 197 g/mol = 5.5g

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Answer:

There are chiral centers on the molecule thus making it a molecule with stereoisomers.

Explanation:

Stereoisomerism is defined: a form of isomerism in which molecules have the same molecular formula and sequence of bonded atoms (constitution), but differ in the three-dimensional orientations of their atoms in space.

The easiest way to see if this definition is true for any molecule is to see if there are any chiral centers / asymmetric centers. To do this, you would need to look for an sp3 hybridized (tetrahedral) carbon on the molecule with four different groups attached to it. For example, the C in -CH3 would not be a chiral center as there are 3 of the same H's attached to it.

On the given molecule there are 4 chiral centers which makes it a chiral molecule and thus a stereoisomer. Any molecule with one or more chiral centers has stereoisomerism. In this molecule it is easy to see as the chiral centers are the carbons with the wedges and dashes bonded to them indicating the 3D orientation of the constituents. With dashes denoting into page toward the back, and wedges denoting out of the page toward you.

Answer:

C)

Explanation:

Answer:

Density of Water

Explanation:

Answer:

Is d PHIVOLCS

Explanation:

PHIVOLCS stands for Philippine Institute of Volcanology and Seimology.

This agency monitors the movements of the earth's crust and warns if there is any possibility of disaster such as volcanic, tsunami and earthquake.

Answer:

43 protons

36 electrons

56 neutron

Explanation:

neutron is mass number minus proton number.

in a non neutral atom the electron is determined after minusing the charges or electron lost.

the number of proton obviously is 43

Initially, we will consider only solutions of a solid in ... (d) Calculate the volume (in mL) of 0.1065 M Sr(OH)2 required to titrate 25.00 mL of 0.2465 M.

:

Explanation: