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Answer:

Astronaut

Explanation:

Astronaut.He is 100kgs

Answer:

B. Sexual reproduction results in offspring that each have a unique set of genes.

Explanation:

New genetic variation arises in a species as a result of sexual reproduction which results in offspring having a unique set of genes.

Answer:

B

Explanation:

Answer:

14

Explanation:

The lithium atom has 3, which is its atomic number. (Atomic number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.) The chlorine atom has 17, so if you find the difference, it would be 14.

Answer:

b) 1.0g

Explanation:

C=m

MV

where Cis concentration

m is mass of substance

M is molar mass

V is volume of substance

To find m

CMV=m

but M = 23+16+1

= 40

0.1×40×0.25=m

1.0=m

Explanation:

I think pebbles because the pebbles can be different sizes and have bigger gaps in between them so the water will go through quicker.

hope this helps srry if wrong

Answer:

Cs2S

Explanation:

The chemical formula of cesium sulfide is Cs₂S.

A chemical formula gives information about the chemical proportions of atoms of each element in a chemical compound or molecule. The chemical formula of a compound can be written by utilizing the chemical symbols of elements, numbers (subscripts), and other symbols, such as plus (+) and minus (−) signs, commas, dashes, and brackets.

A chemical formula of a compound consists of not any words but can be represented in certain simple chemical structures. Chemical formulae can be more restricted in power than chemical names and chemical structural formulae. In chemistry, we have two kinds of chemical formulas: one empirical formula and another molecular formula.

The chemical formula of cesium sulfide is Cs₂S which is an inorganic salt. It can be produced by the reaction of cesium and sulfur in solvent THF  and also can be produced from cesium hydroxide and hydrogen sulfide.

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Answer:

1. V = 1.47L

Explanation:

1) Using PV = nRT

Where;

P = pressure (atm)

V = volume (L)

R = gas constant (0.0821 Latmk mol)

n = number of moles

T = temperature (K)

To get number of moles, we say mole = mass/molar mass

Molar Mass of C2H2 = 12(2) + 1(2)

= 24 + 2 = 26g/mol

mole = 3.86/26

mole = 0.148mol

T (K) = 28.5°C + 273.15

T(K) = 301.65K

PV = nRT

2.5 × V = 0.148 × 0.0821 × 301.65

2.5V = 3.665

V = 3.665/2.5

V = 1.466

V = 1.47L

R =

PV = nRT

P1 V1\ n1 T1 =P2 V2/ n2 T2

1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature

of 28.5 °C?

2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has

cooled?

Answer:

2+/1s2 2s2 2p6/neon

2−/1s2 2s2 2p6/neon

Explanation:

Explanation:

A magnesium atom that loses two electrons to become a magnesium cation has the same electron configuration as neon. An oxygen atom that gains two electrons to become an oxygen anion also has the same electron configuration as neon.

Ion Ion Charge Electron ConfiguratIon Neutral Atom with Similar

Electron ConfiguratIon

sodium 1+ 1s2 2s2 2p6 neon

magnesium 2+ 1s2 2s2 2p6 neon

aluminum 3+ 1s2 2s2 2p6 neon

potassium 1+ 1s2 2s2 2p6 3s2 3p6 argon

calcium 2+ 1s2 2s2 2p6 3s2 3p6 argon

nitrogen (nitride) 3− 1s2 2s2 2p6 neon

oxygen (oxide) 2− 1s2 2s2 2p6 neon

fluorine (fluoride) 1− 1s2 2s2 2p6 neon

sulfur (sulfide) 2− 1s2 2s2 2p6 3s2 3p6 argon

chlorine (chloride) 1− 1s2 2s2 2p6 3s2 3p6 argon

Answer:

Below

Explanation:

Second image

Answer:

Explanation:Metalloids may act either like metals or nonmetals in chemical reactions. Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals.

Answer:

OMG Why has nobody answered this FREE 40 POINTS!!!!

For your ConVenIence Sir!

I shall provide thine with the answer, copied from other great sir.

B.) multiplying the first equation by 2.

Explanation:

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Before adding the intermediate chemical equations to get the final products first we have to multiplying the first equation by 2.

Stoiciometry of any chemical reaction gives idea about the amount of species present before and after the completion of the reaction.

Given first intermediate chemical equation is:

2Na(s) + Cl₂ → 2NaCl(s)

Second intermediate chemical equation is:

2Na₂O(s) → 4Na(s) + O₂(g)

Final products of the given chemical reactions are NaCl and O₂ which are formed by the below given balanced chemical reaction:

2Na₂O + Cl₂ → 4NaCl + O₂

To get the desire balance chemical equation before adding the given intermediate equation, first we have to multiply the first equation by 2.

Hence option (B) is correct.

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Answer:

C

Explanation:

I think that this answer Is more personal but they should try to limite animal cruelty in their research.

Answer:

C

Explanation:

Answer:

valence electrons

Explanation:

This is because the valence electrons determine if an atom of an element can bond with other elements.

Answer:

Pore spaces filled with water

Answer:

0.75 g/cm³

Explanation:

Given data:

Mass of wooden block =  180 g

Length of block = 10 cm

Width of block = 6 cm

Height or thickness = 4 cm

Density of block = ?

Solution:

Volume of block = height × length × width

Volume of block = 4 cm × 10 cm× 6 cm

Volume of block = 240 cm³

Density of block:

density = mass/ volume

d = 180 g/ 240 cm³

d = 0.75 g/cm³

Answer:

54

Explanation:

Answer:

false

Explanation:

Note that the solvent is the substance that is present in the greatest amount. Many different kinds of solutions exist. For example, a solute can be a gas, a liquid or a solid. ... Note that in each case, the solute particles are uniformly distributed among the solvent particles.

Answer:

132g

Explanation:

The reaction equation is given as:

          CaCO₃  →  CaO  + CO₂

Given;

 Number of moles of CaCO₃  = 3 moles

Unknown:

Mass of CO₂ produced  = ?

Solution:

From the balanced reaction equation;

          1 mole of CaCO₃ will produce 1 mole of CO₂;

         3 mole of CaCO₃ will then produce 3 moles of CO₂

To find the mass of CO₂;

  Mass of CO₂ = number of moles x molar mass

      Molar mass of CO₂  = 12 + 2(16) = 44g/mol

 Mass of CO₂ = 3 x 44  = 132g

Answer:

Your answer is B. Energy cannot be destroyed

Explanation:

The total amount of energy remains constant in an isolated system. It states that energy can neither be created nor destroyed, but it can change from one form to another.

Answer:

sunlight

Explanation: i go to school

Answer:

light/sunlight

Explanation:

Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide (absorbed from the air) and water into glucose, a type of sugar.

Hope this helped!

Answer:

Under the earth's surface, rocks melt, metamorphize, and crystalize.

Explanation:

Metamorphic and Igneous rocks are basically dependant on the heat/pressure of the environment under the surface :) Melting, metamorphosing and crystallization all occur under earth's surface.

The specific processes in the rock cycle that occur beneath the Earth surface are :

Under the Earth surface the specific rock cycle processes that leads to the formation of the different types of rocks includes;  Melting, metamorphization and rock crystallization.

Metamorphic rocks are formed from other rocks ( sedimentary and igneous rocks)  due to the change in temperature and this process is metamorphization. while igneous rocks are formed from molten rocks caused by the melting process. Sedimentary rocks are formed by the deposition of sediments from weathering of existing rocks this is the  crystallization process.

Hence the specific process in the rock cycle that occur beneath the Earth's surface are : Melting, metamorphosing and crystallization.

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Answer:

B how much farther does the arrow fly when you use a stronger bow

Explanation:

Option b. How much farther does the arrow fly when you use a stronger bow? represent the new scientific question that can be investigated in the laboratory.

It is a question that may result in a hypothesis for helping out in. It should be answering or figuring out the reason for some kind of observation.

So based on this, we can say that Option b. How much farther does the arrow fly when you use a stronger bow? represent the new scientific question that can be investigated in the laboratory.

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Answer:

b. diamond

Explanation:

Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.

Answer:

Sugar, any of numerous sweet, colourless, water-soluble compounds present in the sap of seed plants and the milk of mammals and making up the simplest group of carbohydrates. (See also carbohydrate.) The most common sugar is sucrose, a crystalline tabletop and industrial sweetener used in foods and beverages.

Explanation: