If Veronica spins in a circle with the compass in her hand, which force keeps the compass' needle pointing north?
A.
an electrical force
B.
a magnetic force
C.
a contact force
D.
a gravitational force

yes both B and D are correct

Catalysts lower the activation energy of the reaction therefore, the rate of reaction will increase. Therefore, option B, D are correct.

Catalysis can be defined as the process of enhancing the rate of a reaction by adding a substance or chemical compound known as a catalyst. Catalysts are usually not consumed in the chemical reaction and can be recovered unchanged after the completion of the reaction.

The catalyst can be recycled quickly, and little amounts of catalysts are sufficient for mixing, temperature, and surface area are factors in the reaction rate. The catalyst reacts with one or more reactants to generate intermediates that provide the final product.

The addition of a catalyst can lower the activation energy of reactant molcules, therefore, increasing the rate of the reaction. Because catalysts increase in frequency the successful collision as more reactant molecules have activation energy.

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Explanation:

the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table

Answer : The correct symbol and charge for each of the ions must be [tex]Na^{+1}[/tex] and [tex]Cl^{-1}[/tex].

Explanation :

The covalent compound are usually formed when two non-metals react.

Ionic compound are usually formed when a metal reacts with a non-metal.

As we know that the sodium chloride is an ionic compound in which sodium is an alkali metal and has one valence electron and chlorine is a non-metal and has 7 valence electrons.

When sodium atom donates an electron to a chlorine atom then it forms an ionic compound that is sodium chloride (NaCl) and the resulting positive ion [tex]Na^{+1}[/tex] and negative ion [tex]Cl^{-1}[/tex] form a stable ionic compound.

Hence, the correct symbol and charge for each of the ions must be [tex]Na^{+1}[/tex] and [tex]Cl^{-1}[/tex].

It provides the plant cell with structure and support, along with protection from bursting due to turgor pressure

Explanation:

Answer:

P₂ = 1.05 atm

Explanation:

Given data:

Initial temperature = 24.0 °C (24+273 = 297 K)

Initial pressure = 0.900 atm

Final pressure = ?

Final temperature = 75 °C (75 + 273 =348 K)

Volume = constant

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

0.900 atm / 297 K = P₂/348 K

P₂ = 0.900 atm × 348 K / 297 K

P₂ = 313.2 atm. K /297 K

P₂ = 1.05 atm

Batteries come in all shapes and sizes, and depending on the type of battery, the minerals that compose them are mainly lithium, cobalt, graphite, nickel and manganese.

Answer:

Sunlight

Explanation:

Sunlight is always neccesary in photosynthesis

Answer:

Carbon Dioxide + Water + Sunlight → Glucose + Oxygen.

Explanation:

Answer:

As sodium and potassium both are alkali metals that belong to Group IA of the periodic table. They have one valence electron in their valence shell. As we move from top to bottom, the reactivity of metallic elements of Group IA increases.

Answer:A

Explanation: reactants: Na2SO4 and SrCl2

Products: NaCl and SrSO4

The word mole is one of those crazy words that have multiple meanings that can sometimes lead to confusion. Perhaps your first thought after hearing the word is a cute little animal that burrows in the ground.

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Answer:

sodium sulfate

Explanation:

For naming an ionic compound with polyatomic anion, the metal is written first using its element name followed by name of the polyatomic anion. Therefore, the compound with Na+Na+ cation and SO2−4SO42− anion is named as sodium sulfate.

The empirical formula : MnO₂.

Given

632mg of manganese(Mn) = 0.632 g

368mg of oxygen(O) = 0.368 g

M Mn = 55

M O = 16

Required

The empirical formula

Solution

You didn't include the pictures, but the steps for finding the empirical formula are generally the same

Mn : 0.632 : 55 = 0.0115

O : 0.368 : 16 =0.023

Mn : O =

[tex]\tt \dfrac{0.0115}{0.0115}\div \dfrac{0.023}{0.0115}=1\div 2[/tex]

The empirical formula : MnO₂

The molar mass is given by the sum of the atomic masses of the component elements of the substance.

In our case, the substance is ethanol or C₂H₅OH.

[tex]A_C=12.011 [/tex]

[tex] A_H=1.0079 [/tex]

[tex] A_O=15.9994[/tex]

[tex]\mathcal M_{C_2H_5OH} = 2 \times A_C + 6 \times A_H + A_O = 2 \times 12.011 + 6 \times 1.00079+ 15.999 4= 24.022 + 6.0474 + 15.9994= 46.069≈ \boxed{46.07 \dfrac{g}{mol}}[/tex]

Answer:

Explanation:

47 i took the test

Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom. Based on this information, the mass number of the silver would be 107.

The total number of protons present in an atom is known as the atomic number of that atom. The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom.

As given in the problem Silver (Ag) has 47 protons, 60 neutrons, and 47 electrons in each atom.

The atomic number of the silver =  number of protons

                                                     = 47

The mass number of the silver = number of protons + number of neutrons

                                                   =47 + 60

                                                   =107

Thus, based on the given information the mass number of the silver would be 107.

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Answer:

For a: The increasing of atomic radius is:

Al < Mg < Na

For b: The pH of the solution of sodium oxide is greater than 7.

Explanation:

Atomic radius is defined as the distance of the nucleus to the outermost shell containing electrons.

It decreases as we move from left to right in a period because electrons get added up in the same shell and effective nuclear charge increased which results in the shrinkage of the atom.

Sodium lies in Period 3, group 1. Its atomic radius is 1.90

Magnesium lies in Period 3, group 2. Its atomic radius is 1.60

Aluminium lies in Period 3, group 3. Its atomic radius is 1.32

The increasing of atomic radius will be:

Al < Mg < Na

The mathematical values proves the result.

There are 3 types of solution based on pH:

When a metal reacts with oxygen present in air, it forms basic oxide which simply means when they react with water, they form basic solution.

The chemical equation for the reaction of sodium (metal) with oxygen present in air and reaction with water of the product so formed are as follows:

[tex]4Na+O_2\rightarrow 2Na_2O[/tex]

[tex]Na_2O+H_2O\rightarrow 2NaOH\text{ (base)}[/tex]

Sodium forms a basic solution when its oxide reacts with water, therefore the pH of the solution will be greater than 7.

Moles in the container : 0.306

Given

30 g of H3PO4

Required

moles in container

Solution

A mole is a unit of many particles (atoms, molecules, ions) where 1 mole is the number of particles contained in a substance that is the same amount as many atoms in 12 gr C-12  

1 mole = 6.02.10²³ particles  

While the number of moles can also be obtained by dividing the mass (in grams) with the molar mass of element or molecule  

MW of H3PO4 = 3.1 + 31 + 4.16 = 98 g/mol

mol = mass : MW

mol = 30 : 98

mol = 0.306

Answer:

Cenoizic

Precamborian

Answer:

B - Covalent bonds

Explanation:

Covalent bonds are a class of chemical bonds where valence electrons are shared between two atoms, typically two nonmetals. The formation of a covalent bond allows the nonmetals to obey the octet rule and thus become more stable.

Answer:

Radioactive

Explanation:

:D

Answer:

c-Radioactive

Explanation:

Answer:

b. CaCl2

Explanation:

It consists two elements

The substance that can be said to be a compound would be = CaCl2. That is option B.

A chemical compound is defined as the substance that is made up of two or more elements that are chemically combined together.

Typical examples of chemical compounds include the following:

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Answer:

Well if glaciers were to most likley melt wit would have a big affect on the world. But on Florida the affect would be as everybody would expect, a flash flood, with high water's and everything under water. AND there would most lilkley be something in the glacier. Not highly sure about it though

Explanation:

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Lm/aooooo was that supposed to be a quesadilla?

Answer:

why it just a mistake everyone make a mistake i belive in you.

Explanation:

Answer:

The solution is acidic.

Explanation:

The nature of solution will be acidic.

A solution is just a uniformly dispersed mixture of more than solutes in a solvent.

In nature, chemical species with a pH value between. are termed acidic. Acidic substances have a sour flavor in general. In the beginning, acid was defined as a sour substance that interacts with metal as well as turns blue litmus red.

Calculation of pH.

Given data:

pOH = 12

The nature of the solution can be calculated by pH formula.

pH+ pOH = 14

Put the value of pOH in above expression.

pH = 14-pOH

pH = 14-12

pH = 2.

Hence, the nature of the solution will be acidic.

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Answer:

See the answer below

Explanation:

The cross that would produce the maximum number of offspring with green sea pods would be:

1. GG x GG, or

2. GG x gg

The first one would produce all green offspring with homzygous genotypes as follows:

     GG   x   GG

 GG   GG   GG   GG

The second cross would produce all green offspring with heterozygous genotypes as follows:

      GG   x   gg

   Gg   Gg   Gg   Gg

Explanation:

When zinc reacts with dilute hydrochloric acid, it is a metal-acid reaction to produce zinc chloride and hydrogen gas.

Zn (s) + 2HCl (aq) => ZnCl2 (aq) + H2 (g)

Ionic equation:

Zn2+ (aq) + 2Cl- (aq) => ZnCl2 (aq)

Answer:

512g, 25%

Explanation:

H_2+I_2→ 2HI

3 moles H_2× 2moles HI/1 mole of H_2= 6 moles of HI

2moles I_2×2 moles of HI/1 mole of I_2= 4 moles of HI

Now, theoretical yield of HI = 4 moles ×128 g/ mole = 512 g

percentage yield = (128g/512g)×100 = 25%

Answer:

Glucose

Explanation:

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