Ice sheets once covered the upper northeastern portion of the United States.
True or False?

Answer:

B.

Copper and zinc mix to make brass.

Explanation:

This is the only answer in which a new substance is created, the rest of the choices are just mixtures

Answer:

11.1g

Explanation:

Given parameters:

Mass of water  = 100g

Unknown:

Mass of hydrogen gas  = ?

Solution:

We need to write the balanced reaction equation first and solve from the known to the unknown;

       2H₂O  →  2H₂   +  O₂

Now, find the number of moles of the given specie;

 Number of moles of H₂O  = [tex]\frac{mass}{molar mass}[/tex]

     Molar mass of H₂O = 2(1) + 16  = 18g/mol

Number of moles  = [tex]\frac{100}{18}[/tex]  = 5.56mol

   2 mole of water produced 2 mole of hydrogen gas;

  5.56 mole of water will produce 5.56 mole of hydrogen gas

     Mass of hydrogen gas = number of moles x molar mass

    molar mass  = 2(1)  = 2g/mol

    Mass of hydrogen gas  = 2(5.56) = 11.1g

1.calcium monohydroxid

2.sulfur dioxide

3.sry don't know

Answer:

Who knows...

Explanation:

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Answer:

68.77×10²³ atoms

Explanation:

Given data:

Density of Al = 2.70 g/cm³

Volume of Al block = 114.2 cm³

Number of atoms of Al = ?

Solution:

First of all we will determine the mass of Al.

D = m/v

2.70 g/cm³ = m/114.2 cm³

m = 2.70 g/cm³ × 114.2 cm³

m = 308.34 g

Now we will calculate the number of moles of Al.

Number of moles = mass/molar mass

Number of moles = 308.34 g/27 g/mol

Number of moles = 11.42 mol

Number of atoms of Al:

1 mole = 6.022×10²³ atoms

11.42 mol × 6.022×10²³ atoms/1 mol

68.77×10²³ atoms

Answer: 129.93577

Explanation:

There-

Answer:

A is the correct option

Explanation:

batteries have chemical energy and will convert to electricity and when reached to bulb, it emits light as electromagnetic rays

Answer:

28.0134

Explanation:

Answer:

Explanation:

n=m/Mr

Molar mass =2(14)

n=1.80/28

n= 0.064

Answer:

physical - cloth

                tree

                brick

                chair

                lights

                 glass

chemical-  fuel

                 fire

Explanation:

Answer:

your very f,k,n, d,u,m,b

Explanation:

Answer:

H2o

Explanation:

Water (chemical formula: H2O) is a transparent fluid which forms the world's streams, lakes, oceans and rain, and is the major constituent of the fluids of organisms. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds.

Answer:

Its B

Explanation:

Answer:

Explanation:

h= e/v

6.022 x 10^23 = 4.36 x 10^-18/ v

v= 6.58 x 10^15

C= lambda x frequency

3.00 x 10^8= 6.58 x 10^15 x lambda

lambda (y)= 4.56 x 10^-8

Answer:

Explanation:

λ = hc/E

6.626 x 10^-34 J-s x 2.998 x 10^8 m-s^-1

                     4.36 x 10^-18 J

= 4556.13486239

= 4.56 x 10^1 nm

Answer:

Answer

Explanation:

Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. ... This distribution of fossils led to theories that the southern continents were once joined in a supercontinent called Gondwana.

Answer: Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.

Explanation: I hoped that helped plzz mark as brainliest !!

Answer:

Gas(this is because we are only considering that there are 3 states of matter, while in reality there are 5.)

Explanation:

There are actually 4 states of matter excluding a 5th one that has just been discovered, but if we consider that there are only 3 states of matter then the particles move the fastest in gases. As the particles are the furthest apart.

Answer:

scientists

Explanation:

Answer:

This means that waves need a medium to propagate, but light waves propagate where no particles are present. ...

Answer:You'd wind up with a pH-neutral substance.

Answer:

We wouldn't have Coronavirus

Explanation:

Answer:

Because it lose detectable mass.

Explanation:

Law of conservation of mass states that substances involved in chemical reaction do not lose or gain any mass. So the above reactions don't demonstrate the law of conservation of mass because it lose mass

Hi, the given question is incomplete, the complete question is:

It takes 4.37 J of heat to raise the temperature of Object A by 1°C, and 2.88 J to raise the temperature of Object B by 1°C. Suppose A and B are brought into contact. A is initially hotter. A is seen to cool down by 6.3°C . How would you calculate the rise in temperature of B?

Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.

Answer:

The correct answer is 9.56 degree C.

Explanation:

Based on the given information, the given object A is initially hotter than object B, and the direct contact between them permits the transfer of heat between them. Based on the law of conservation of energy, the energy cannot be created nor be destroyed. In the given case, the energy, which is lost from object A can only be gained by object B.

Let us consider that both the objects exhibits equal mass, now in order to determine the transfer of energy between them there is a need to multiply the heat capacity with the temperatures. Therefore,

Energy lost by object A = Energy gained by object B

Heat capacity of object A × Temperature lost by object A = Heat capacity of object B × Temperature gained by object B

4.37 J/°C × 6.3 °C = 2.88 J × Tb

Tb = (4.37 J/°C × 6.3° C) / 2.88 J

Tb = 9.56 °C

Answer:

H- hydrogen

Explanation: Hydrogen is in the first group meaning that it only has 1 valence electron and 1 energy level

Answer:

the answer is radiation

Answer:Liquid A: 0.358 g/ml

Liquid B: 0.605 g/ml

Liquid C: 1.677 g/ml

Explanation:

Liquid A: 0.358 g/ml

Liquid B: 0.605 g/ml

Liquid C: 1.677 g/ml

Answer:o It is important to realise that mixing will be small unless there are electrons in the 4a1 LUMO, this is why NH3 is pyramidal while BH3 is planar! ... This mixing is very strong and stabilises the 3a1 MO substantially and hence NH3 is trigonal pyramidal and not planar.

Explanation:

Answer:

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. This is also useful for describing the chemical bonds that hold atoms together.

Answer:

P₂ = 1.03 atm

Explanation:

Given data:

Initial pressure = 1.00 atm

Initial temperature = 293 K

Final temperature = 303 K

Final pressure = ?

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

1.00 atm / 293 K = P₂/303 K

P₂ = 1.00 atm × 303 K / 293 K

P₂ = 303 atm. K /293 K

P₂ = 1.03 atm

Answer:

D

Explanation:

D: Both the motion of the particles in the substance and the temperature of the substance increase.

I Hope That This Helps!!!

Both the motion of the particles in the substance and the temperature of the substance increase.

For more information:

https://brainly.com/question/18989562?referrer=searchResults

Explanation:

hydrogen and sodium are in same froup

Answer:

0.0125mol/dm³

Explanation:

Given parameters:

Mass of carbon dioxide  = 0.22g

Volume of water  = 400cm³

Unknown:

Concentration in mol/dm³ =  ?

Solution:

Concentration is the amount of solute dissolved in a solvent.

The formula is expressed as;

    Concentration  = [tex]\frac{number of moles}{volume}[/tex]  

Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

       Molar mass of CO₂   = 12 + 3(16) = 44g/mol

Number of moles  = [tex]\frac{0.22}{44}[/tex]   = 0.0005mol

Now,

             1000cm³  = 1dm³

             400cm³ = [tex]\frac{400}{1000}[/tex]  = 0.4dm³

Insert the parameters and solve;

     Concentration  = [tex]\frac{0.005}{0.4}[/tex]  = 0.0125mol/dm³

Mass of Fe₂O₃ : 74.26 g

Volume of O₂ at STP = 15.624 L

Reaction

4Fe (s) + 3O₂ (g) ==> 2Fe₂O₃ (s)

mol Fe :

Ar Fe = 56 g/mol

[tex]\tt \dfrac{52}{56}=0.93[/tex]

mol Fe₂O₃ :

[tex]\tt \dfrac{2}{4}\times 0.93=0.465[/tex]

mass Fe₂O₃ :

MW Fe₂O₃ : 159,69 g/mol

[tex]\tt 0.465\times 159,69=74.26~g[/tex]

mol O₂ :

[tex]\tt \dfrac{3}{4}\times 0.93=0.6975[/tex]

volume O₂ at STP(1 mol=22.4 L)

[tex]\tt 0.6975\times 22.4=15.624~L[/tex]