hi...need help....thank you..

Answer:

3

Explanation:

It's basically saying what number goes into 12 four times, I think.

Answer:

A student is drinking a cup of hot chocolate as they sit by a campfire on a chilly evening. They know that the cup of hot chocolate transfers thermal energy to the surrounding air. The heated air over their cup of hot chocolate expands and rises and is replaced by cooler, denser air.

This method of energy transfer is

Explanation:

Answer:

radiation

Explanation:

radiation is when an existing heat source spreads heat to its surroundings

Answer:

0.00001= 1 x 10^-5. Since HCl is an acid, 1 x10^-5 is the H+ concentration. Write only the number of the exponent. Therefore, pH = 5.

Answer:

C. read the label on the container

Explanation:

What information is found in an SDS? Check all that apply.

A. the identification of the chemical

C. the chemical and physical properties of the substance

D. the first-aid measures to take if an accident occurs involving the chemical

Answer:

C

Explanation:

just did it

Answer:

C6H12O6 → 2C2H5OH + 2CO2

Explanation:

Glucose is an organic molecule, specifically a sugar, with the formula C612O6 while ethanol is another organic molecule with formula; C2H5OH.

However, as rightly said in this question, ethanol can be got from glucose via a process called fermentation in the presence of a catalyst called YEAST. The balanced equation is as follows:

C6H12O6 → 2C2H5OH + 2CO2

Answer:

they are either donated to or taken by another atom to achieve octet arrangement

Explanation:

for example Na+ and Cl- .. they both have one extra and one less electron .

so they donate and receive one electron to/from each other to achieve the octet arrangement ..

Answer:

you will get 17.983 g of lithium for every 100 g of lithium phosphate.

Explanation:

69.7%  is the percent by mass of Lithium in  Li[tex]_3[/tex]PO[tex]_3[/tex]. A percent is obtained by multiplying the result by 100.

One approach to show the concentration for an element within a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total weight of the combination by the mass of each component and multiplying the result by 100%. The mass percent is calculated by dividing the mass that contains the compound and solute by the mass for the element or solute.

99.795g/mol = molar mass of  Li[tex]_3[/tex]PO[tex]_3[/tex]

6.94g/mol = molar mass of Li

mass percentage of Li=(molar mass of Li/molar mass of Li[tex]_3[/tex]PO[tex]_3[/tex])×  100

=(6.94/99.7)×  100

=69.7%

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Answer:

k. e. = 1/2 mv^2

100 = 1/2 * m * 5^2

100 = 1/2 * m * 25

m = 100 *2/25

m = 8 kg

hope it helps you

Answer:

a small medical thermometer with a short but finely calibrated range, for taking a person's temperature.

Answer:

Thermometer which are used in clinical to measure the temperature of human body is called clinical thermometer.

Answer:

Explanation:

1 is true

2 is false

3 is true

4 is true

5 is false

That is what I got from researching.

Only about 3% of the water in the Earth is fresh water and about 75 % of the fresh water on Earth is frozen in ice sheets.  

• The most vital element present on the Earth is water. All the living beings are dependent on it.  

• Water is present in the majority of the Earth, however, of this only 3% of the water is freshwater, the rest is saline and undrinkable.  

• Of this 3%, the 75 percent of the freshwater is present in the form of ice and glaciers in the polar region.  

• The remaining 24 percent is the groundwater and the rest 1 percent includes the waters of rivers, lakes, and ponds.  

• The prime source of usable freshwater is present in the trapped form in the ice and glaciers.  

Thus, the correct statements are 1st and 3rd.

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Answer:

Molecular formula = C₄H₁₂O₂

Explanation:

Given data:

Percentage of hydrogen = 13.80%

Percentage of carbon = 51.02%

Percentage of oxygen = 35.18%

Molecular formula = ?

Solution:

Number of gram atoms of H = 13.80 / 1.01 = 13.6

Number of gram atoms of O = 35.18 / 16 = 2.2

Number of gram atoms of C = 51.02 / 12 = 4.25

Atomic ratio:

            C                      :      H             :         O

           4.25/2.2           :     13.6/2.2     :       2.2/2.2

            2                      :        6          :        1

C : H : O = 2 : 6 : 1

Empirical formula is C₂H₆O.

Molecular formula:

Molecular formula = n (empirical formula)

n = molar mass of compound / empirical formula mass

Empirical formula mass = C₂H₆O = 46 g/mol

n = 88 / 46

n = 2

Molecular formula = n (empirical formula)

Molecular formula = 2 (C₂H₆O)

Molecular formula = C₄H₁₂O₂

Answer:

cold butter melted when heated, lighting a match, baking cookies,

Explanation:

Answer Electromagnetic waves are used to transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays.

Explanation:

Electromagnetic waves are important in society today because they are used to "transmit long/short/FM wavelength radio waves, and TV/telephone/wireless signals or energies. They are also responsible for transmitting energy in the form of microwaves, infrared radiation (IR), visible light (VIS), ultraviolet light (UV), X-rays, and gamma rays."

The question is incomplete, the complete question is;

In this stoichiometry problem, determine the percentage yield:

Excess aluminum metal reacts with aqueous nickel(II) sulfate to produce aqueous aluminum sulfate and nickel as a precipitate. In this reaction 108 g of aluminum were combined with 464 g of nickel(II) sulfate to produce 274 g of aluminum sulfate.

Answer:

80%

Explanation:

The correct equation for this reaction is;

2Al(s) + 3NiSO4(aq) --------> Al2(SO4)3 + 3Ni(s)

We already know that Al is in excess then NiSO4 is the limiting reactant.

Hence, Number of moles in 464 g of NiSO4 = mass/ molar mass

Molar mass of NiSO4 = 155 g/mol

Number of moles = 464g/155g/mol = 2.99 moles

Number of moles of Al2(SO4)3 = mass/molar mass

molar mass = 342 g/mol

So, Number of moles = 274g/342g/mol = 0.8 moles

Given the stoichiometric reaction equation;

3 moles of NiSO4 yields 1 mole of Al2(SO4)3

2.99 moles of NiSO4 yields 2.99 * 1/3 = 1 mole of Al2(SO4)3

percentage yield is given by; actual yield/ theoretical yield * 100/1

actual yield =  0.8 moles of Al2(SO4)3

Theoretical yield = 1 mole of Al2(SO4)3

Hence;

% yield = 0.8/1 * 100 = 80%

Answer:

How do atoms give off light?

Atoms emit light when they are heated or excited at high energy levels. The color of light that is emitted by an atom depends on how much energy the electron releases as it moves down different energy levels. ... It shows the electron moving down energy levels.

Explanation:

To solve this we must be knowing each and every concept related to autotroph. Therefore, eugenides and algae, both can be autotrophic. The correct option is option B.

An creature that can make its own sustenance out of inorganic materials is known as an autotroph. Contrarily, heterotrophs are species that can't make their own nutrition and must eat other organisms in order to survive.

In contrast to autotrophs, heterotrophs are unable to manufacture their own nourishment. Heterotrophs need to consume organic material in order to produce the nutrients needed for life, not inorganic. Eugenides and algae, both can be autotrophic.

Therefore, Eugenides and algae, both can be autotrophic. The correct option is option B among all the given options.

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Answer:

a) silver

Explanation:

Given data:

Mass of object = 26.94 g

Volume of object = 2.568 cm³

Which subject is this = ?

Solution:

Formula:

d = m/v

by putting values

d = 26.94 g/ 2.568 cm³

d =  10.49 g/cm³

Densities of objects: g/cm³

iron =  7.874

gold = 19.32

silver =  10.49

copper = 8.92

Thus, given object is silver.

Answer:

Conduction

Explanation:

Conduction is how heat transfers through direct contact with objects that are touching. Any time that two objects or substances touch, the hotter object passes heat to the cooler object.

Answer:

Conduction

Explanation:

Conduction is how heat transfers through direct contact with objects that are touching. Any time that two objects or substances touch, the hotter object passes heat to the cooler object.

Geologists use the following tests to distinguish minerals and the rocks they make: hardness, color, streak, luster, cleavage and chemical reaction.

Answer:

(a) Decomposition: A substance breaks down to smaller species. [e.g. CaCO3(s) → CaO(s) + CO2(g) Decomposition of limestone to calcium oxide (quicklime) and carbon dioxide on heating.]

Answer:

i think its c somebody correct me if im wrong. but hope this help

Explanation:

Answer:

N2+ 3H2－> 2NH3

2Fe + 6HCl －> 3H2 + 2FeCl3

Answer:

B.

Explanation:

Answer:  There are many properties of a metal which is taken into consideration when it is used for construction

Explanation:

The properties can be physical, chemical, et cetera. The physical properties that is considered are:

1. Durability:  It can be defined as the property of the material to withstand the atmospheric pressure and other factors.

2. Density: The ratio of mass by volume of a material (homogeneous material) is called as density.

3. Fire resistance: The ability of the material to withstand in fire without changing its size or shape.

4. Weather resistance: The ability of the material to withstand the weather which could be variable round the year.

5.Water absorption: The ability of the material to absorb water and retain it.

Answer:

Explanation:

21:B 22:B

Answer: A decomposition reaction occurs when one reactant breaks down into two or more products.

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Answer:

The evidence of matter scattering light wave in many different directions is;

D. The colors on the water's surface match the colors in the sky

Explanation:

Light scattering is used to describe the sending of a given beam of light in many directions (by tiny particles) when the light passes through a medium, due to the disruption of the bath of the light ray as it bumps into the tiny particles

Water has the nature of absorbing the red light. The light that enters the water is scattered by the tiny particles in the water such that the blue light which is the spectrum of light water allows to pass through is reflected along with the reflection of the sky and the colors of the water surface match the colors of the sky.

Answer:

C.

Explanation:

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