EZ MODE -_- What could you do in an experiment to get more accurate results?  Change two of your variables. Only make observations that involve sight. Only use new materials. Perform repeated trials​

Answer:

is number 1

Explanation:

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Explanation:

kind of ion formed (anion or cation) and the size of the ionic charge. ... O-‐2 oxide. S-‐2 sulfide. N-‐3 nitride. P-‐3 phosphide. Table 3.1. Common, simple anions. It is critically important that you distinguish between ...

Ions and Ionic Compounds – Introductory Chemistry – 1st Canadian Edition - BC Open Textbooks

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The formula Na 2Cl 2 also has balanced charges, but the convention is to use the lowest ratio of ions, which ... For the ionic compound between magnesium cations (Mg 2+) and oxide anions (O 2−), again we need only ...

[PDF] Tutorial 2 FORMULAS, PERCENTAGE COMPOSITION, AND THE MOLE FORMULAS: A chemical formula shows the elemental composition of a sub

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Ba2+ barium. HSO3. – hydrogen sulfite. MnO4. – permanganate. Al3+ aluminum. SO4. 2– sulfate. NO2. – nitrite. Sn2+ tin(II). HSO4. – hydrogen sulfate. NO3. – nitrate. Sn4+ tin(IV). S2O3. 2– thiosulfate. OH– hydroxide.

Symbols and Charges for Monoatomic Ions

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Cs+ cesium ion O2- oxide. Be2+ beryllium ion S2- sulfide. Mg2+ magnesium ion Se2- ... one K+ and one Cl¯ are required. The resulting formula is KCl. Example 3: Write the formula from the following name: barium

Barium chloride salts has a 3 to 2 ratio of cations to anions. thus option C is correct.

Barium Chloride an inorganic salt which is composed up of barium cations (Ba2+) and chloride anions (Cl–), otherwise named as  Barium Muriate or Barium dichloride.

It is a white solid , water-soluble, hygroscopic and gives a slight yellow-green color to a flame,  extensively used in the industry mainly The sulfate is used in white paints where as Barium chloride is poisonous in nature.

It is soluble in water which dissociate into barium cations and chloride anions in its dissolved state, However, the solubility of this compound in water is temperature-dependent.

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Answer:

- A new substance was formed in the chemical change while no be substance was formed in the physical change

- The chemical change involved a change in chemical composition while the physical change involved no change in chemical composition

Please find the explanation below.

Explanation:

A physical change is a change that does not alter the chemical content of the substances involved, hence, no new substances are produced while a chemical change alters the chemical composition, hence, new substances results.

In this question,

- Water is heated till it forms steam is characterized as a physical change

- Lighted splint is applied to hydrogen gas to produce water in the form of steam is characterized as a chemical change.

- The first process is a PHYSICAL CHANGE because it involved only a change of state i.e. from liquid to gas, hence, no alteration to the chemical composition of the molecule and also no new substance is produced.

- The second process is a CHEMICAL CHANGE because there was a chemical combination of hydrogen gas and the oxygen in the lighted splint to yield water molecules ( a new substance). Therefore, it involved a chemical reaction and formation of a new substance

Answer:

A option

Explanation:

Because recatants are in solid form having less enetropy and products are liquid form having more entropy

While other options reactants and products are in same phase gas phase having same entropy

The reaction that would result in increased entropy is the combustion reaction;

KNO3(s)--->K+(aq)+NO3-(aq). Option A

This is further explained below

Generally, a combustion reaction is simply a combustion process that occurs when a material combines with oxygen gas, producing energy as light and heat.

In conclusion, the chemical reaction KNO3(s)--->K+(aq)+NO3-(aq) is has all properties of a combustion reaction as the solid reactants gives an aq solution.

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Answer:

See explanation

Explanation:

Dalton's atomic theory furnished us with a basis to discuss the theory of atoms. However, not all his ideas holds up under the scruitiny of morden science.

He postulated that atoms were 'indivisible' the discovery of subatomic particles indeed show that there are smaller particles than atoms.

His postulation that atoms can neither be created nor destroyed does not hold water today because atoms are being created in nuclear reactors.

He said that atoms of all elements are exactly alike. Today we know there are isotopes of elements which are not exactly alike.

We can see that the Dalton's atomic theory did not take cognisance of the important role of subatomic particles in studying the structure of the atom. Modern atomic theory tries to look at the importance of these particles in the understanding the structure of the atom.

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Answer:

When the number of electrons does not equal the number of protons, the atom is ionized.

Answer:

Explanation:

V/t

Answer:

The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart

Explanation:

This should help you out

Answer:

Beta decay is most common in elements with a high neutron to proton ratio. Gamma decay follows the form: In gamma emission, neither the atomic number or the mass number is changed. A high energy gamma ray is given off when the parent isotope falls into a lower energy state.

Explanation:

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Answer:

Pi to 5 decimals is 3.14159-

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P.S. It's a repeating number, but you can just put a (-), so that you don't have to type the whole thing out.

Answer:

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Answer:

1st paragraph:

1.compound 2.physical 3.elements 4.water 5. gas 6.white 7. season 8.ratio 9.formula 10.elements 11.atoms 12.subscript 13.one

2nd paragraph

1.stable 2.many/reactive 3.eight 4.helium 5.seven 6.outer 7.one 8.level 9. compounds 10.reactive 11. seven 12. Eight 13.lose 14.gain 15. Share 16.compounds 17. atoms

Explanation:

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Answer:

Shear

Tension

Compression

Explanation:

The 3 stress forces are;

-shear

-tension

-compression

1) Shear is the stress force that pushes back a mass of rock in two opposite directions which in turn will produce strike - slip faults.

2) Tension is the stress force that pulls on the crust thereby stretching in a manner that it becomes thinner at its middle which in turn will produce normal faults.

3) Compression is the stress force that makes rocks squeeze until they fold or break and this will in turn produce reverse faults.

Answer:

Solvent

Explanation:

When one substance dissolves into another, a solution is formed. A solution is a homogeneous mixture consisting of a solute dissolved into a solvent

Answer:

You can find the mass of water by multiplying the density of water by its volume.

mass = Density x volume

Explanation:

It is very easy to find the mass of water once you know the formula of density. "Density" refers to mass per unit volume.

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

Therefore, mass = ρ x volume

The density of water is 1 kg/L.

For example, if the volume of water is 500 ml, then you can get its mass by multiplying 500 ml by 1 kg/L.

Let's convert 500 ml to Liter first.

500 ml x [tex]\frac{1 L}{1,000 ml}[/tex] = 0.5 L

Now, let's compute.

mass = ρ x volume

mass = 1 kg/L x 0.5L

mass = 0.5 kg

The mass of a 500-ml water is 0.5 kg.

Answer:

c)vibrating and in a regular arrangement

Explanation:

Copper is a chemical element represented by the symbol Cu and having atomic number 29. Copper is a transition metal which means its subshells are not completely filled and that is why they are vibrating in the room temperature. But copper is a solid at room temperature with regular arrangement of atoms.

Hence, the correct answer is "c)vibrating and in a regular arrangement".