Question 1
1. Mass reflects the amount of matter in an object.
True
False

Question 2
2. On Earth, your weight is exactly the same where ever you go.
True
False

Question 3
3. On Earth, your mass is exactly the same where ever you go.
True
False

Answer:

The correct option is;

a. The particles will gain a large amount of kinetic energy

Explanation:

As the water temperature reaches 100°C, which is the boiling point for water at atmospheric pressure, the continued heating is then used to break up the strong inter molecular forces between molecules of the water  such that the individual molecules are free to move about and due to the high temperature, have gained considerable amount of kinetic energy for the to rise to appreciable height and to also spread.

The heat which converts water into steam is called latent heat as during the boiling phase, the temperature of the water remains constant.

d the particles will have the same average kinetic energy.

Answer:

It can mean "boardwalk" or a "board of a school."

~Mia Sedillo~

Answer:

I think it is b

Explanation:

but I'm not for sure that the answer is right

Answer:

20g/cm³

Explanation:

density= mass÷volume

m= 60g÷3cm³

= 20g/cm³

Answer:

A box

Explanation:

In quantum mechanics, the atom is metaphorically described as a box. In fact, the Schrödinger wave equation is based on the three dimensional box metaphor of the atom.

Thus, a box provides a convenient treatment of the atom as it represents the fundamental components of the problem of atomic structure, hence the answer.

C. A box

Thus, the correct option is C.

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Answer:

The final volume of gas is 9.19 L.

Explanation:

Given that,

Volume = 10.0 L

Initial pressure = 1.50 atm

Final pressure = 1240 mmHg

We need to calculate the final volume of gas

Using formula of ideal gas

[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]

[tex]V_{2}=\dfrac{P_{1}V_{1}}{P_{2}}[/tex]

Where, P₁ = initial pressure

P₂ = final pressure

V₁ = initial volume

Put the value into the formula

[tex]V_{2}=\dfrac{1.50\times10\times760}{1240}[/tex]

[tex]V_{2}=9.19\ L[/tex]

Hence, The final volume of gas is 9.19 L.

Answer:

option a is not correct

Answer:

protons, neutrons and electrons are the sub atomic particles

Answer:

A hypothesis

Explanation:

A hypothesis is an intelligent guess that is put forward in order to explain an observation. If it is observed that there is a difference in the rate of growth of plants that receives fertilizer and those that do not receive fertilizer, then we can hypothesize that;"If a plant receives fertilizer, then it will grow to be bigger than a plant that does not receive fertilizer". This is must now be subjected to a series of experiments in order to ascertain its validity.

This is the scientific method.

Answer:

Mass; mass; amount of space taken up.

Explanation:

Matter is anything that has mass and takes up space. The mass of an object measures the amount of matter or substance the object contains.

Volume is the measure of the amount of space taken up by the object.

The SI units for mass and volume are kilogram (kg) and cubic meter (m³) respectively.

Generally, matter exists in three (3) distinct phases and these are;

1. Solid: it is the state of matter in which the physical substance has a definite shape and fixed volume but not compressible. Examples of solids are pen, screwdriver, television, car etc.

2. Liquid: it is the state of matter in which the physical substance can be poured and takes the shape of its container. Also, liquids generally have a definite volume. Examples of liquids are urine, water, milk, blood etc.

3. Gas: it is the state of matter in which the physical substance has no definite shape or volume and as a result fills all available space. Also, gases are easily compressible and can flow. Examples of gases are hydrogen, oxygen, argon, nitrogen etc.

Explanation:

Using percentage by volume (v/v)

When the solute is a liquid, it is sometimes convenient to express the solution concentration as a volume percent.

Formula

The formula for volume percent (v/v) is: [Volume of solute (ml) / Volume of solution (ml)] x 100

Example

Make 1000ml of a 5% by volume solution of ethylene glycol in water.

Procedure

First, express the percent of solute as a decimal: 5% = 0.05

Multiply this decimal by the total volume: 0.05 x 1000ml = 50ml (ethylene glycol needed).

Subtract the volume of solute (ethylene glycol) from the total solution volume:

1000ml (total solution volume) - 50ml (ethylene glycol volume) = 950ml (water needed)

Dissolve 50ml ethylene glycol in a little less than 950ml of water. Now bring final volume of solution up to 1000ml with the addition of more water. (This eliminates any error because the final volume of the solution may not equal the calculated sum of the individual components).

So, 50ml ethylene glycol / 1000ml solution x100 = 5% (v/v) ethylene glycol solution.

Explanation:

We need to convert 42.0 microliters into liters. Liters and microliters are the units to find the volume. Volume is the space occupied by an object. We must know 1 micro equals to what. So,

[tex]1\ \mu =10^{-6}[/tex]

So,

[tex]42\ \mu L=42\times 10^{-6}\ L[/tex]

So, there are [tex]42\times 10^{-6}\ L[/tex] in 42 microliters.

FeS+O2=Fe2O3+SO2

Iron (II) sulfide + Oxygen gas

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Answer:

Critical thinking initiates the act of hypothesis.

Critital thinking initiates the hypothesis. By thinking you will come across a question you want to answer. In the conculsion crititcal thinking is used again to validate the hypothesis.

Answer:

Harry S. Truman

Explanation:

Because he was the 33rd president

Answer:

20

Explanation:

The atomic number is just the number of protons in an atom. So if the atom has 20 protons, the atomic number is also 20.

Answer: Mass remains constant

Explanation:

Answer:

According to the octet rule, each atom required to complete eight electrons in the outermost shell of p orbital and  s- and p- orbitals in an atom's outermost energy level are filled except some atoms. Gallium is one of the exception that does not follow octet rule.

Gallium is a chemical element having atomic number 31 and the electronic configuration of Gallium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p.

The electron change needed to obtain an gallium octet by removing the 4p electron and form Ga+.

Answer:

FDA

Explanation:

Answer:

FDA

Explanation: it right ;)

Answer: by researching the experiment, it helps you make sure you get everything right. If you didn't research it, there's a possibility you can get the experiment wrong.

Answer:

Explanation:

A pure substance is a element in it's original state.  Two metals mixed together are not pure, if they were separated they would be pure.  A rock is not pure since it is a mixture of a lot of materials, that formed that rock.  Does this help?

Answer:

False

Explanation:

Pure substance has no mixtures

Answer:

This question lacks options but it will be answered based on the fact that laboratory processes including heating are done using glasswares. The answer is:

Conical or Erlenmeyer/Boiling flask

Explanation:

Glasswares are simply laboratory equipments made of glass. They are used in performing the various laboratory processes like mixing, storing chemicals, heating and cooling etc. Glasswares includes flasks e.g volumetric flask, Erlenmeyer flask etc, beaker, test tube, graduated cylinder etc.

Heating a liquid that would splatter or splash in a laboratory requires using a glassware that can prevent spilling of the liquid outside it. A FLASK such as Erlenmeyer or boiling flask is best suited for this purpose because they generally have a conical shaped body with a narrow neck that prevents liquid chemicals from spilling when heated or shaken. Flasks can also be corked with a lid to prevent the liquid from coming out.

Answer:

A. the liquid will not boil

Answer:

0.00580 →

3000 →

0.000908 →

200. →

Explanation:

yay

Answer:

[tex]\large \boxed{\mathrm{view \ explanation}}[/tex]

Explanation:

4.060 × 10⁵ (scientific notation)

The decimal point moves 5 places to the right.

⇒ 406000 (standard form)

7 × 10³ (scientific notation)

The decimal point moves 3 units to the right.

⇒ 700 (standard form)

5.0 × 10⁻⁴ (scientific notation)

The decimal point moves 4 units to the left.

⇒ 0.0005 (standard form)

8 × 10⁻² (scientific notation)

The decimal point moves 2 units to the left.

0.08 (standard form)

Answer:

18 m/s

Explanation:

v = d/t = 90/5=18

Answer:

They did not repeat their tests multiple times.

Explanation:

It may seem that the question is incomplete. The complete question is as below: Dominic and Eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results:

Dominic: 78 seconds

Eva: 81 seconds

Why are their results unreliable and can lead to a pseudoscientific claim?

They did not repeat their tests multiple times.

They used the same type of stopwatch.

They did not change the reactants in their chemical reactions.

Only one person should have collected the data.

Dominic and Eva's results are unreliable and can lead to a pseudoscientific claim because they did not repeat their tests multiple times.

Repeating the test multiple times and finding the average of the measurement will minimize the chance of having error in the measurement and improve the accuracy of the outcome.

Thus, without repeated measurement, the reliability and the validity of the measurement would be in doubt.

What is the formula unit we are looking at?

This answer is incomplete plz edit it.

THX

Answer:

D,the atom are vibrating in place

A small group of a repeating pattern of the atomic structure is defined as the unit cell. It is the building block of the crystal structure. A crystal structure have atoms are vibrating in place. The correct option is D.

The crystal structure is obtained by attaching atoms, groups of atoms or molecules. This structure is formed from the intrinsic nature of the constituent particles to produce symmetric patterns. The ordered arrangement of atoms, ions, molecules form crystal structure.

The oscillation of atoms in a solid about the equilibrium position is defined as the Lattice vibration. It is the equilibrium positions which form a regular lattice because the atoms are bound to neighboring atoms.

Salt is comprised of tiny cubes that are bound together through ionic bonding of sodium and chloride ions.

Thus the correct option is D.

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Answer:

Ceramics can be used in items where insulation is required or is preferred for the usage of the item. Examples would be bowls, plates, mugs, vases, pots, and other various items.

Explanation:

The reason why ceramics are often used in these items is due to the various properties that ceramics possess. As stated in the question, they are resistant to moisture, don't conduct electricity, and can withstand high temperatures.

Answer:can be used in a place where electric conductivity is not needed and in a place where moisture is not needed.

Explanation:we use ceramics for our bath room mostly because moisture is not needed there

Answer:

[tex]\huge \boxed{\mathrm{Carbon \ disulphide}}[/tex]

Explanation:

Carbon disulphide is the liquid that can be used to separate iron fillings and sulphur powder.

When carbon disulphide is poured into the dish, the sulphur powder gets easily dissolved in the carbon disulfide. The iron fillings are left to settle on the bottom of the dish.

The iron fillings can get seperated through filtration. When the mixture of sulphur powder and carbon disulphide gets completely evaporated, the sulphur powder is left over.

Carbon disulfide is a liquid that can be used for the separation of iron fillings and sulfur powder. So the correct option is A.

The substances seen around us most of the time are usually not in their pure form. Basically, they are a mixture of two or more substances.

Mixtures are also found and formed in a lot of different forms. Hence, several types of separation techniques are there that can be used for the separation of the mixture of substances. Separation is needed for the removal of all the unwanted materials and also for obtaining useful components from the mixture.

Following are some common methods that are used for the separation of substances or mixtures. These are Handpicking, winnowing, threshing, sieving, distillation, filtration or sedimentation, magnetic separation, separating funnel, etc.

Therefore, carbon disulfide is used and the correct option is A.

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