Choose ALL of the statements below that are stated as a hypothesis.
The brighter the color of an orange, the juicler the fruit
The faster a river flows, the greater the erosion.
Most apples are red, but some are yellow.
Baking powder is used in biscuits.
Brass contains copper and zinc.

Answer: Mean

Explanation:

The histogram in the given picture gives slightly bell shaped curve.

That means the data is symmetric and follows normal distribution.

Out of Mean, Median and mode , Mean is the best measure of the center of the data when data distribution is continuous and symmetrical.

We choose median if data has extreme values where as mode is considered as least measure of tendency and it used in nominal data.

Hence, the correct option is "Mean".

Explanation:

(P1V1)/T1=(P2V2)/T2

(15X5)/297=(p2x2.5)/473

p2=47.78cmHg

Answer:

Computer.

Explanation:

The computer is moving more than the floor, at least, it's moving when people are typing on it.

Answer:

Sea ice

Explanation:

Sea ice has a much higher albedo compared to other Earth surfaces

Answer:

312 minutes

Explanation:

because 1 hour = 60 minutes this is the example they give you so then you do the math from there

Answer:

Explanation:

This question seeks to test the knowledge of separation techniques.

From the narration in the question, the first separation to be done is the removal of Iron fillings by the use of magnet (magnetic separation). Since Iron is magnetic, the iron fillings will be attracted by the magnet hence removing the iron fillings from the mixture.

The second constituent to be removed will be the copper pieces by the use of a sieve (sieving). Copper pieces have relatively larger sizes than sand and common salt, hence a sieve (which separates particles based on size) can be used to remove the copper pieces from the mixture.

What will be left in the mixture after the processes above will be salt and water. This mixture will have to be dissolved in water; the salt will dissolve in water while the sand will not. After which, filtration will be done to remove the sand which will be collected on the filter paper as filtride and the salt solution will pass through the filter paper as filtrate.

The salt solution can then be evaporated to dryness to retrieve the solid salt from the solution.

The amount of salt in the mixture can then be measured using a weighing balance.

Some of safety measures to be taken during the course of this experiment includes performing the experiment in an airtight and controlled environment. Lab coat and hand gloves should be worn during the course of the experiment. The evaporation to dryness should not be done close to an inflammable material/substance

Answer:

plantae

Explanation:

if you look up the Latin it says plantae

Answer:

"Cactus", wich is a member of the plant family Cactaceae.

Answer:

The correct answer is 101 feet.

Explanation:

To solve this problem, we need to remember the rules of significant figures.  Any digit that is not zero is significant, and any zero is significant if it is between two non-zero digits or a trailing zero after the decimal point.  Now, let's apply these rules to the options that are given:

1000 yards - Since the zeros are not after the decimal point or between two other digits, they are not significant.  This means the only significant digit is 1, so there is only 1 significant digit.

1014 miles - All three of the non-zero digits are significant, and the 0 is significant in this case because it is between two other significant digits.  Therefore, this number has 4 significant digits.

101 feet - The two 1's are significant because they are non-zero digits, and the zero is also significant because it is between the two 1's.  Therefore, this number has 3 significant digits.

Thus, your answer is 101 feet.

Hope this helps!

Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass = 54 g

volume = 20 cm³

Substitute the values into the above formula and solve for the density

That's

We have the final answer as

Hope this helps you

The number after rounded upto 3 significant figures is 1050.

We have a decimal number.

We have to round it up to 3 significant figures.

The term significant figures refers to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.

According to the question, We have -

A = 1047.78

1047.78 (the original number has 6 significant figures)

The number after rounding up to three significant figures will be -

1050 (rounded to 3 significant figures)

Hence, the number after rounded upto 3 significant figures is 1050.

To solve more questions on Significant figures, visit the link below-

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Answer:

Maybe the sizes are too big which means that they need to be smaller because the more compact they are the more smooth and straight they will be because when they are too big it is easier to break them which would lead to a bumpy surface.

Explanation:

I don't know :)

he Solids model formed by atoms as solid spheres for macroscopic measurements, the model has no problems, because the atoms are extremely small

Dalton's atomic model was the first scientifically based model formulated in 1808, it consists of atoms with spheres that cannot be divided and solids are formed by contact between the spheres and chemical compounds are formed by joining atoms of two or more elements, this model is used to approximate solids such as solid spheres there are today.

The size of these spheres (atoms) is very small, nowadays it is known that it is of the order of 10⁻⁹ m, therefore, having a macroscopic crystal more than 10⁻⁶ m in length, it is impossible to measure fluctuations in the sizes of the spheres, since there are 10⁹ spheres in this volume, therefore it is not possible to measure the fluctuations with instruments,

To be able to measure this fluctuation, very small samples and very high resolution transmission microscopes are needed.

In conclusion, the model of the atom as solid spheres for macroscopic measurements, the model has no problems.

Learn more about solids here:

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Answer:

N2 + O2 → 2NO is an oxidation-reduction reaction.

Explanation:

An oxidation-reduction reaction (also know as Redox reaction) is a type of chemical reaction that involves a transfer of electrons between two species. It occurs when the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.

We will consider the equations one after the other.

Oxidation numbers of the individual element on the reactant side:

KOH : K = +1, O = -2, H = +1

HNO3 : H = +1, N = +5, O = -2

Oxidation numbers of the individual element on the product side:

H2O: H = +1, O = -2

KNO3: K = +1, N = +5, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

CaCl2 : Ca = +2, Cl = -1

Na2SO4: Na = +1, S = +6, O = -2

Oxidation numbers of the individual element on the product side:

CaSO4: Ca = +2, S = +6, O = -2

NaCl: Na = +1, Cl = -1

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

AgNO3: Ag = +1, N = +5, O = -2

NaCl: Na = +1, Cl = -1

Oxidation numbers of the individual element on the product side:

AgCl: Ag = +1, Cl = -1

NaNO3: Na: +1, N = +5, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

Al2(SO4)3: Al =+3, S = +6, O = -2

KOH: K = +1, O = -2, H = +1

Oxidation numbers of the individual element on the product side:

Al(OH)3: Al =+3, O = -2, H = +1

K2SO4: K = +1, S = +6, O = -2

There is no change in the oxidation numbers, hence, it is not an oxidation-reduction reaction.

Oxidation numbers of the individual element on the reactant side:

N2: N = 0

O2: O = 0

Oxidation numbers of the individual element on the product side:

NO: N = +2, O = -2

There are changes in the oxidation numbers, hence, it is an oxidation-reduction reaction.

The following is an oxidation-reduction reaction - N2 + O2 → 2NO

Oxidation numbers represent the potential charge of an atom in its ionic state. If the oxidation number decreases in a reaction, it is reduced. If an atom's oxidation number increases, it is oxidized.

= > Oxidation state of N in the reactant is 0

=> Oxidation state of N in the product is +2

So, N is oxidized

=> Oxidation state of O in the reactant is 0

=> Oxidation state of O in the product is -2

So, O is reduced

Thus, the following is an oxidation-reduction reaction - N2 + O2 → 2NO

Learn more:

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Answer:

no

Explanation:Unused chemicals are never returned to their original containers because you will be contaminating the chemical. Dispose of unused chemicals in the proper containers.

Answer:When chemists study chemical substances, they examine two types of properties: chemical properties and physical properties. Some physical properties are extensive properties, properties that depend on the amount of matter present. Mass and volume are extensive properties.

Explanation:

Answer:

to observe the change in the color of the substance during a reaction

Explanation:

1B.a metal that lost one electron

4C a non metal that gained two electrons

Answer: T = 9.74°C

Explanation: An ideal gas in a quasi-static adiabatic process follows the equation: [tex]pV^{\gamma} = constant[/tex].

So:

[tex]1.10^{1.67} = constant[/tex]

constant = 46.7735

Adiabatic conditions can be written as:

[tex]TV^{\gamma-1}=constant[/tex]

Then, new temperature is

[tex]T.(10.4)^{1.67-1}=46.7735[/tex]

[tex]T.(10.4)^{0.67}=46.7735[/tex]

[tex]T = \frac{46.7735}{4.802}[/tex]

T = 9.74°C

The new temperature is 9.74°C.

Explanation:

The orbital diagram of an electron with eight electron is attached.  Since the 2p orbitals are filled using the maximum space available instead of pairing the electrons, this is in accord with Hund's rule.

When filling orbitals, you should put one electron in each box.  After all of the boxes in the orbital have one electron in each, you can then put the second electron into each of the boxes.

Answer:

Drug compounding is often regarded as the process of combining, mixing, or altering ingredients to create a medication tailored to the needs of an individual patient.

Answer:

5.8 x 10³

Explanation:

Answer:

13 grams of Oxygen

Explanation:

Step 1: Find molecular formula of sugar

C₁₂H₂₂O₁₁

Step 2: Convert moles of oxygen present to grams

1 mol O = 16 g O

11 mol O = 176 g O

Step 3: Find molar mass of sugar

C - 12.01 g/mol

H - 1.01 g/mol

O - 16.00 g/mol

12.01(12) + 22(1.01) + 11(16.00) = 342.34 g/mol C₁₂H₂₂O₁₁

Step 4: Set up dimensional analysis

[tex]25 gC_{12}H_{22}O_{11}(\frac{176 gO}{342.34gC_{12}H_{22}O_{11}} )[/tex]

Step 5: Multiply/Divide and cancel out units

Grams of C₁₂H₂₂O₁₁ and grams of C₁₂H₂₂O₁₁ cancel out.

We are left with grams Oxygen

25/342.32 = 0.073031(176) = 12.8535 grams Oxygen

Step 6: Simplify

We only have 2 significant figures in this problem. Thus,

12.8535 = 13 g O

Answer:

C)peer review

Explanation:

Peer review involves the evaluation of scientific research work by other professionals working in the same field. It is one of the stages a manuscript passes through before it is published in any reputable journal.

Peer review is important because it ensures that only high quality and original scientific research is published for the consumption of other professionals in the same field.

Answer:

The answer is "Comet".

Explanation:

The comets were interstellar frozen gas of snowballs, stone, and debris orbiting the sun, which are also the size of average towns while frozen. As even the orbit of the comet passes near the sun, it warms up and spreads dust and gas into a big floating head greater than most stars.  

Answer: A Planet

Explanation:

The International Astronomical Union defines a planet as a spherical object that orbits a star. Planets clear the neighborhood around their orbits (i.e., no other bodies share their orbits).

Explanation:

We know that,

1 mile = 1609.34 m

We need to find how many meters are present in the 12.45 miles. To find it use unitary method as follows :

12.45 mile = 1609.34 × 12.45

12.45 mile=20036.283 meters

or

[tex]12.45\ mile=2.0036\times 10^4\ m[/tex]

Hence, this is the required solution.

Answer:

It’s the first model

Explanation:

Answer:

The solar system shows the planets in their orbits around the sun in this order: Mercury, Venus, Earth, with Moon, Mars, Jupiter, Saturn. First choice

Explanation:

Just had the question.

Answer:

It solved the issue of depending on too many base units

Explanation:

It was first adopted by the French government. Metric system was developed by Gabriel Mouton of Lyons, he is called the founding father of the metric system. He proposed the decimal system of measurement that was refined by the scientists.

The metric system is simple for making measurements, you just need to know few metric units. There are seven base units in this system of measurement while there are twenty base units in inch-pound system of measurement. Metric system is easier to remember. The metric system follows the decimal number system and it decreases and increases in size by 10.

It has been adopted by all the countries of the world except Myanmar and US.  

Explanation:

It is given that, the Average Speed of the orbiting space shuttle is  17500 miles/hour.

We need to convert the speed in kilometers/ second

We know that,

1 mile = 1.609 km

or

1 km = 0.621 miles

1 hour = 3600 seconds

[tex]17500\ \dfrac{\text{miles}}{\text{hour}}=17500\ \dfrac{\text{miles}}{\text{h}}\times \dfrac{1\ h}{3600\ s}\\\\=17500\times \dfrac{\text{miles}}{3600\ s}[/tex]

Now cancel the miles in numerator.

[tex]17500\times \dfrac{\text{miles}}{3600\ s}=17500\times \dfrac{\text{miles}}{3600\ s}\times \dfrac{1.609\ km}{1\ \text{miles}}\\\\=17500\times \dfrac{1.609}{3600}\ km/s\\\\=7.82\ km/s[/tex]

So, 17500 miles/hour is equal to 7.82 km/s.

Answer:

Option A. 231 90Th

Explanation:

Please see attached photo for explanation

Answer:

If you were to divide any object into small pieces of unit volume, the density would be the mass of each small piece. Everything is made up of molecules, which in turn are made up of atoms. So every object is created from the aggregation of atoms and molecules.

:)

Answer:

There are 6.94x10⁶ C of the negative electric charge contained in the electrons of all the lithium atoms in the container.

Explanation:

We have 3 moles of electrons (e⁻) in 1 mol of Li, so the quantity of negative electric charge is:

[tex] \frac{3 moles \thinspace e^{-}}{1 mol Li}*24 moles Li*\frac{6.022 \cdot 10^{23} e^{-}}{1 mol \thinspace e^{-}}*\frac{1.60 \cdot 10^{-19} C}{1 e^{-}} = 6.94 \cdot 10^{6} C [/tex]

Therefore, there are 6.94x10⁶ C of the negative electric charge contained in the electrons of all the lithium atoms in the container.

I hope it helps you!          

Answer:

TRUE MY DOOD

Explanation: