Young stars, just beginning their life in the galaxy, would contain mostly
A)
carbon
B)
helium
iron and nickel
D)
hydrogen and helium.

Answer:

One of the main functions lipids do is storing energy.

provide the building blocks for muscle tissue

Answer:

c

Explanation:

edge

Answer:

B

Explanation:

A arrow sign is -->

A equal sign is =

And, the plus sign is +

Which means the only option left is B Coefficient!

Hope this helps!

Answer: Radioisotopes are used by manufacturers as tracers to monitor fluid flow and filtration, detect leaks, and gauge engine wear and corrosion of process equipment. Small concentrations of short-lived isotopes can be detected whilst no residues remain in the environment.

Explanation: Uranium-235 is used for nuclear fission and as a fuel in nuclear reactors.

An isotope of cobalt is used in the treatment of cancer.

An isotope of iodine is used in the treatment of goiter.

Answer:

An object could be traveling at a constant speed, but change directions

Explanation:

Hope that helps

Answer:

100 mL

Explanation:

Given data:

Mass of CaCO₃ produced = 2.00 g

Molarity of CaCl₂ = 0.200 M

Volume of CaCl₂ needed = ?

Solution:

Chemical equation:

Na₂CO₃  + CaCl₂    →      2NaCl + CaCO₃

First of all we will calculate the number of moles of CaCO₃.

Number of moles = mass/molar mass

Number of moles = 2.00 g / 100.09 g/mol

Number of moles = 0.02 mol

Now we will compare the moles of CaCO₃ and CaCl₂.

              CaCO₃          :            CaCl₂

                   1                :               1

                 0.02           :              0.02

Thus, 0.02 moles of CaCl₂ react,

Volume of CaCl₂ reacted:

Molarity = number of moles / volume in L

0.200 M = 0.02 mol / volume in L

Volume in L = 0.02 mol / 0.200 M

Volume in L = 0.1 L

Volume in mL:

0.1 L × 1000 mL/1L

100 mL

Answer:

A) 60

Explanation:

Given data:

Distance traveled by car = 210 km

Time taken = 3.5 hour

Speed of car = ?

Solution:

Formula:

S = d/t

s = speed of car

d = distance

t = time

by putting values,

s = 210 km / 3.5 hour

s = 60 km/hour

Answer:

[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]

Explanation:

Hello!

In this case, since the catalytic reactions involve the presence of a catalyst that decrease the activation energy of the undergoing chemical reaction, when we need to include it in the chemical equation, we usually put on or underneath the reaction arrow, just as shown below:

[tex]C+O_2\ \overrightarrow{Pd} \ CO_2[/tex]

Best regards!

Answer:

1. chemical

2. chemical

3. chemical

4. physical

5. chemical

6. physical

7. chemical

8. chemical

Answer:

All are correct

Explanation:

I agree with all except the first one

The concentration in mol/L of the chemist's potassium iodide solution : = 4.4 x 10⁻⁴ M

Given

88. μmol of Potassium iodide

200. mL volumetric flask

Required

The concentration

Solution

Molarity is a way to express the concentration of the solution

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

Conversion :

88. μmol = 88 . 10⁺⁶ mol = 8.8 10⁻⁵ mol

200 ml = 0.2 L

The molarity :

= n : V

= 8.8.10⁻⁵ : 0.2

= 4.4 x 10⁻⁴ M

Answer:

im not sure but i do know you have to look under 5.2

Explanation:

The volume of CO= 2.912 L

Given

Dehydration of 6 g of methanoic acid with H2SO4

Required

The volume of CO

Solution

Reaction

HCOOH  ⇒​  CO+H₂O

MW = 1.Ar C+2.Ar H+2.Ar O

MW = 1.12+2.1+2.16

MW= 46 g/mol

mol = mass : MW

mol = 6 g : 46 g/mol

mol = 0.13

From equation, mol ratio HCOOH  : CO, so mol CO = 0.13

Vm = 22.4 L

so for 0.13 mol :

= 0.13 x 22.4 L

= 2.912 L

Answer:

i dont know u tell me thats why i am here

Explanation:

Answer:

T = 1603 K

Explanation:

Given data:

Number of moles of gas = 1.9 mol

Temperature of gas = ?

Pressure of gas = 5 atm

Volume of gas = 50 L

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

By putting values,

5 atm × 50 L = 1.9 mol × 0.0821 atm.L/ mol.K  × T

T = 250 atm.L / 1.9 mol × 0.0821 atm.L/ mol.K

T = 250 atm.L /0.156 atm.L/K

T = 1603 K

Answer:

It is not true that this is an example of a chemical reaction. This is a typical example of physical reaction.

Most physical changes are often phase changes.

A phase change is a change in the physical state of a body.

In this change, it is from solid to liquid.

Now new substances are formed.

When substances are changed from one form to another, it is a physical change.

In a chemical change, a new substance is formed at the end of the process.

Explanation:

yess of course

if you study the steps of melting the iron and makes the ores pure, you will know that there's many reaction happen to convert to wires

Answer:

Mass = 19.0 g

Explanation:

Given data:

Mass of limestone react = ?

Mass of lime produced = 11.2 g

Solution:

Balanced chemical equation:

CaCO₃     →      CaO + CO₂

Number of moles of lime:

Number of moles = mass / molar mass

Molar mass of lime 56.1 g/mol

Number of moles = 11.2 g/ 56.1 g/mol

Number of moles = 0.19 mol

Now we will compare the moles of CaO and CaCO₃

                     CaO        :           CaCO₃

                       1             :             1

                     0.19          :          0.19

Mass of limestone react:

Mass = number of moles × molar mass

Mass = 0.19 mol × 100.1 g/mol

Mass = 19.0 g

Answer:

Carbon atoms can form double bonds by sharing two pairs of electrons; they can also form triple bonds by sharing three pairs of electrons.

Carbon atoms can form double bonds by sharing two pairs of electrons; they can also form triple bonds by sharing three pairs of electrons.

An organic compound is any of a large class of chemical compounds in which one or more atoms of carbon are covalently linked to atoms of other elements, most commonly hydrogen, oxygen, or nitrogen.

A carbon atom can participate in a maximum of four bonds; either four single bonds, two single bonds and a double bond, or one single bond and a triple bond.

A double bond is formed when two atoms use two electron pairs to form two covalent bonds; a triple bond results when two atoms share three electron pairs to form three covalent bonds.

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Answer:he

H

Explanation:

541 grams is the mass of [tex]4.98\times 10^{24}[/tex] atoms of Zn.

Explanation:

Given

The number of zinc atoms =[tex]4.98\times 10^{24}[/tex]

To find:

The mass of given atoms of zinc atoms

Solution:

The number of zinc atoms =N=[tex]4.98\times 10^{24}[/tex]

According to mole concept:

1 mole = Avogadro 's Number = [tex]N_A= 6.022\times 10^{23} atoms/ molecules/ions[/tex]

Let the moles of zinc be = n

Number of atoms in n moles of zinc will be:

[tex]N=n \times N_A\\4.98\times 10^{24} atoms= n\times 6.022\times 10^{23} atoms\\n=\frac{4.98\times 10^{24} atoms}{ 6.022\times 10^{23} atoms}=8.27[/tex]

Moles of zinc = 8.27 mol

Molar mass of zinc = 65.38 g/mol

Mass of 8.27 moles of zinc:

[tex]=8.27\times 65.38 g/mol=540.67 g\approx 541 g[/tex]

541 grams is the mass of [tex]4.98\times 10^{24}[/tex] atoms of Zn.

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Answer:

distance-155

displacement-65

Explanation:

this is what i got and it may be wrong

To solve this we must be knowing each and every concept related to displacement and distance. Therefore, the distance and displacement of the family are 110 km and 65Km respectively.

The separation between two places of an item in motion is known as displacement. Therefore, it relies on both the starting position and the ending position. Displacement is also the shortest distance between the initial and ultimate places.

The meter is used as the calculation's standard unit since it measures distance (m). Displacement is an important notion in many applications in physics. The distinction between two locations of an object is known as displacement. Because it has both a direction and magnitude, it qualifies as a vector quantity.

distance=110 km

displacement=  110 km- 45 km

                      =65Km

Therefore, the distance and displacement of the family are 110 km and 65Km respectively.

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Answer:

c

Explanation:

Answer:

there is no limiting reactant.

Explanation:

Given that:

CaF₂  +  Br₂  ----->     CaBr₂  + F₂

From the above equation;

We can see that there is an equal number of moles in the reactant side of the equation.

i.e.

one mole of CaF₂  reacts with one mole of Br₂.

Thus, there is no limiting reactant.

There will be no limiting reactants as the chemical equation has the reactant totally consumed and thus leading to no reactants.

We can see that there's an identical range of moles withinside the reactant aspect of the equation

It is the substance that gets into the chemical reaction.

Thus, there's no proscribing reactant.

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Answer:

What question?

Explanation:

Answer:

how u doing good?

<(^-^)>

helloooo

Answer:

Explanation:

Na 2O + CO 2 → Na 2CO. 3

This is an acid-base reaction (neutralization): Na 2O is a base, CO 2 is an acid.

Hope this helps!!!!!!

Brainlist please

The reaction of N₂O with CO₂ giving Na₂CO₃ is a combination reaction, where two reactants combines to form a product.

There are different kinds of reactions namely, displacement reactions, combination reactions, decomposition reaction etc.

The reaction in which one reactant species displace the constituent group of another reactant it is termed as displacement reactions. On decomposition reaction, one reactant decomposes into two or more products.

In a single displacement reaction, one of the group is displaced to form a new product and in double displacement reactions, two species from reactant side are displaced.

Similarly, a reaction in which two reactants simply combines to form a product is termed as combination reaction.

Therefore, the type of the given reaction is combination.

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Answer:

In physics, the kinetic energy of an object is the energy that it possesses due to its motion It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity Having gained this energy during its acceleration the body maintains this kinetic energy unless its speed changes

Example:

A semi-truck travelling down the road

A river flowing at a certain speed

Answer:

B

Explanation:

Density = mass / volume

66 grams / 10 cm = 6.6 g per cubic cm

Answer:

D

Explanation:

Same Wavelength. Also cause i did the test

Answer:

They have the same wavelenght

Explanation:

Answer: H-H

Explanation: it’s symmetrical on both sides

The structural formula of the nonpolar molecule is H-H. Therefore, option (3) is correct.

A molecule that does not have the charges present at the end as the electrons are finely distributed and symmetrically cancels out each other is a non-polar molecule. A polar molecule cannot be mixed with a non-polar molecule in a solution.

Water is a polar molecule that does not mix with oil as it is a non-polar molecule. Non-polar molecules have a net dipole moment of zero as the dipoles of the atoms are canceled out within the molecule.

Non-polar bonds have formed because the difference in the electronegativities of atoms is less than 0.5. Non-polar bonds do not are generally formed in compounds where there is a presence of symmetry.

The HCl has differences in the electronegativities of hydrogen and chlorine atoms. Therefore, HCl is a polar molecule. Ammonia is also a polar molecule due to the difference in the electronegativities H and N.

Therefore, the Hydrogen molecule (H-H) is a nonpolar molecule as the electronegativity difference is zero.

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