What needs to happen for a chemical change to happen?

Answer:

When popcorn is popped, liquid inside the kernel is changed to steam. Pressure from the steam builds up inside the kernel. When the pressure reached a critical stage the kernel pops turning itself inside out. This is a physical change.

Explanation:

Answer:

the answer is (a)true.

Answer (s) true.

Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.

Answer: B. dinosaur bone

Explanation: Took the test hope this helps! :)

Answer:1.atoms give one or more electrons with each other to form the bond

2. Each atom is left with a complete outer shell

3. A covalent bond forms between two

nonmetals

Explanation:

Answer:

an organ system  Is a group of organs that work together to perform a com

Explanation:

that is the answer organ system

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Answer:

Here is the opportunity for  

ciaracrudup to have brainliest

since you need another answer

Explanation:

Answer:

Yea fs

Explanation:

Answer:

1. suspencion

2.colloid

Explanation:

Answer:

Moritz is watching his little brother play in a mud puddle. Moritz notices that when his brother stirs it with a stick, after a few moments the dirt settles back to the bottom of the puddle. His brother is creating a SUSPENSION.

Anjali knows that whole milk has more fat than skim milk. However, the solid fat doesn’t seem to separate from the liquid milk even after it has been in the fridge for a few days. This is evidence that milk is a COLLOID.

An equation which follow the law of conservation of mass is called the balanced equation. The coefficient of copper (II) nitrate is 1 .The correct option is C.

A chemical equation in which the number of atoms of reactants and products on both sides of the equation are equal is defined as the balanced chemical equation.

The coefficients are the numbers which are used to balance the chemical equation. They are added in front of the formulas. According to law of conservation of matter, mass can neither be formed nor be destroyed.

The balanced equation for the given reaction is:

Cu (s) + 2AgNO₃ (aq) → Cu (NO₃)₂ (aq) + 2Ag (s)

Here the coefficient of Cu (NO₃)₂ is 1. The number of 'Cu', 'Ag', 'N' and 'O' atoms are equal. So the given equation is balanced. The coefficient of AgNO₃ is 2, and 'Ag' is 2.

Thus the correct option is C.

To know more about balanced equation, visit;

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Answer:

A.

Explanation:

Particles in gas move very fast and quickly while particles in liquids are slow and closer together.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{5.29 \times {10}^{22} }{6.02 \times {10}^{23} } \\ = 0.087873...[/tex]

We have the final answer as

Hope this helps you

Answer:

Chemical

Explanation:

The rotting of fruit is a chemical reaction. This is because when fruit spoils, an enzymatic reaction occurs. Because an enzymatic reaction causes molecules to change when rotting, rotting is a chemical reaction.

well,It is a chemical change because once an apple rots, it cannot go back to its original form as a new, clean, and fresh apple. and that is a chemical change. making it be different on a chemical level.

Answer:

chemical change

Explanation:

the reason for a fruit to rot is the enzyme reactions in it we can take that as a solid reason and on the other hand if it is a physical change we can reverse the change that means we should be able to take a rotten fruit and make it to its original position so that we can have it. but we can never do that so we can prove that rotting of fruits is a chemical change.

hope this helps

Answer:

It's b

Explanation:

Answer:

d - orbital

Explanation:

The d-orbital can modelled by a peanut shape.

A peanut shape closely resembles the shape of a double dumb-bell shape. The double dumb-bell shape is like that of a peanut.

Therefore, since a peanut is like a double dumb-bell, it clearly models the d-orbital.

Answer:

no its not balanced because we have 2 N in the reactants while we have 1 in the product same for 0 we have 2 0 in the reactants and 1 in the products

for it to be balanced it should be NO + O2 → NO2

Explanation:

Answer:

[tex]\boxed {\boxed {\sf Temperature=Average \ kinetic \ energy}}[/tex]

Explanation:

Temperature is also known as the average kinetic energy in a substance.

If there is an absence of heat in a substance, the particles move slower and the kinetic energy decreases. The temperature will be lower, because there is less kinetic energy.

If heat is present or applied, the particles move more, so kinetic energy increases. The temperature will be higher, since there is more kinetic energy.

So, the relationship is: temperature is the measure of average kinetic energy.

Answer:

DIRECT

Explanation:

Answer:

Calcium phosphide (D)

Explanation:

Hope I helped^^

Can i please get brainliest

Answer:

Explanation:

i am thinking 3 and 2 but i am gonna say it is 2

98.654321%

Answer:

Both Jack and Jane are correct. Unprocessed oil, petroleum, is a mixture of organic compounds that need to be isolated or separated to be used.

Explanation:

Answer:

300,000 years

Explanation:

100g=0 years

50g=100,00 years

25g=200,00 years

12.5g=300,000 years

Answer:

Rolling down a steep hill

Explanation:

Answer:

Q = 1461.6 J

Explanation:

Given data:

Mass of ice = 36 g

Initial temperature = -20°C

Final temperature = 0°C

Amount of heat absorbed = ?

Solution:

specific heat capacity of ice is 2.03 j/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT = T2 - T1

ΔT =  0°C - (-20°C)

ΔT = 20°C

Q = 36 g ×2.03 j/g.°C×20°C

Q = 1461.6 J

Answer:

21.3g

Explanation:

The formula of the compound is;

        Fe(NO₃)₃

Given:

volume  = 500mL  = 0.5L

concentration  = 0.175mol/L

Unknown:

Mass of  Fe(NO₃)₃ measured = ?

Solution:

To solve this problem, find the number of moles first;

      Number of moles of  Fe(NO₃)₃ = concentration x volume

 So;

      Number of moles  = 0.175 x 0.5   = 0.088mol

Now to find the mass;

  Mass  = number of moles x molar mass

      Molar mass of  Fe(NO₃)₃ = 55.8 + 3[14 + 3(16)]

       Molar mass of  Fe(NO₃)₃ = 55.8 + 3(62) = 241.8g/mol

  Mass = 0.088mol x 241.8g/mol  = 21.3g

Answer:

the first one Calories

Answer:

90yrs

Explanation:

Half life is the time taken for half of an original radioactive material to decay by half.

For the sample;

    Half - life = 45yrs

  Original amount  = 600cpm

                 Start                                  Number of atoms    

                 0yrs                                                600cpm

                                   First half life

                 45yrs                                              300cpm

                                  Second half life

                 90yrs                                               150cpm