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DochEvi [55]
4 years ago
12

2. A/An _______ is composed of two or more types of matter that can be present in varying amounts.

Physics
2 answers:
yan [13]4 years ago
7 0

Answer:

2. A compound (has two+ types of matter)

3. Homogeneous (dissolves in another substance)

4. Heterogeneous  mixture

5. Element?

6. Physical?

7. a. physical b. chemical

andrew-mc [135]4 years ago
5 0

A mixture is composed of two or more types of matter that can be present in varying amounts.

A solution is a homogeneous mixture.

A mixture that is not uniform throughout is a heterogeneous mixture.

A pure substance that cannot be broken down chemically is an element.

A characteristic of matter that’s not associated with a change in its chemical composition is known as a physical property.

Wax melting is an example of a physical change in the state of matter.

A banana peel turning brown is an example of a chemical change in the state of matter.

Answers:

<em>2. A mixture</em>

<em>3. a homogeneous</em>

<em>4. a heterogeneous</em>

<em>5. an element</em>

<em>6 & 7. a physical</em>

<em>8. a chemical</em>

<u>Explanation:</u>

Mixtures can be further classified as homogeneous and heterogeneous mixtures based on the types of combining elements.

  • Homogeneous mixtures are also termed as solution as they look uniform throughout the solution.
  • Heterogeneous mixture is composed of different concentration of solute and solvent and it do not look uniform throughout the mixture.  

The physical changes occur on the object without changing its chemical properties like wax melting. While chemical changes occur due to oxidation or reduction or any other kind of reaction with the surface of matter.

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If the engine receives 6.45 kJ of heat energy from the reservoir at 520 K in each cycle, how many joules per cycle does it rejec
Oxana [17]

Answer:

3.72 kJ

Explanation:

QH = 6.45 kJ

TH = 520 K

Tc = 300 K

Qc = ?

By use of Carnot's theorem

Qc / QH = Tc / TH

Qc / 6.45 = 300 / 520

Qc = 3.72 kJ

6 0
3 years ago
How many joules of heat are needed to raise the temperature of 50.0 g of aluminum from 10°C to 110°C, if the specific heat of al
dusya [7]

Answer:

Heat required to raise the temperature of the aluminium is 4750 J

Explanation:

As we know that the heat energy required to raise the temperature of the aluminium is given as

Q = ms\Delta T

here we know that

m = 50 g

\Delta T = 110 - 10

\Delta T = 100 ^oC

so we have

Q = 50(0.95)(100)

Q = 4750 J

5 0
4 years ago
) is it possible for one component of a vector to be zero, while the vector itself is not zero?
Natalka [10]
The least number of component of a vector quantity is two. These are the x-component and the y-component. 

The resultant vector, or vector as we refer to it in this item, can be calculated through the equation,
              RV = sqrt ((Vx)² + (Vy)²)

From the equation, it can be noted that if we let Vx equal to zero,
              RV = Vy

Similarly, if we let Vy be equal to zero then,
             RV = Vx

Thus, it is still possible for the vector to become nonzero even if one of its components is zero. 
8 0
3 years ago
The phenomenon of water sticking to a surface, such as a window pane or
Korolek [52]

Answer:

Because of the Cohesion

4 0
2 years ago
Read 2 more answers
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear
Talja [164]

Answer:

70.07 Hz

Explanation:

Since the sound is moving away from the observer then

f_o = f_s\frac {(v+vs)}{v} and f_o = f_s\frac {(v-vs)}{v} when moving towards observer

With f_o of 76 then taking speed in air as 343 m/s we have

76 = f_s\times\frac {(343-vs)}{343}

f_s=\frac {343\times 76}{343-v_s}

Similarly, with f_o of 65 we have

65 = f_s\times\frac {(343+vs)}{343}\\f_s=\frac {343\times 65}{343+v_s}

Now

f_s=\frac {343\times 65}{343+v_s}=\frac {343\times 76}{343-v_s}

v_s=27.76 m/s

Substituting the above into  any of the first two equations then we obtain

f_s=70.07 Hz

4 0
3 years ago
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