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Flauer [41]
4 years ago
8

In every energy transformation some

Chemistry
1 answer:
kozerog [31]4 years ago
5 0
Thermal heat is released
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Kati was in the kitchen when she heard a crash. She went into her bedroom and found her window broken and a baseball lying on th
dimulka [17.4K]
B. inference because she drew a conclusion based on evidence.

Because the evidence was that she heard the crashing sound, and then when she came into her room saw the broken window and baseball.

It was not an observation because she did not directly see the baseball going through the window

8 0
3 years ago
Read 2 more answers
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms? Their positive charge is located in a small region th
sergey [27]

Their positive charge is located in a small region that is called the nucleus.

Explanation:

Ernest Rutherford in his gold foil experiment was able to demonstrate that the nucleus is made up of positive charges which occupies a small and tiny nucleus.

Rutherford bombarded a thin gold foil with alpha particles from a radioactive source.

  1. He observed that all the particles passed through but a small portion was deflected back.
  2. This led to his proposition of the nuclear model the atom.

learn more:

Ernest Rutherford brainly.com/question/1859083

#learnwithBrainly

5 0
3 years ago
Is it necessary to know the exact volume of the unknown acid or base to be titrated?
Darina [25.2K]
Yes, It is important to know the volume of Unknown acid or base to be titrated.

Titration is carried out in order to find out the concentration (i.e. molarity) of unknown acid or base. In this process a standard solution of acid or base is taken and is titrated with known volume of of titrant. At end point (neutralization) the amount of standard titrant utilized is calculated and following formula is employed to calculate the unknown concentration of unknown solution.

                                     M₁V₁/n₁  =  M₂V₂/n₂
7 0
3 years ago
Read 2 more answers
A hockey puck moving at 28 m/s is caught by an 80.00 kg man who was at rest the man and puck moved together after the collision.
hodyreva [135]

Answer: The final velocity of both man and hokey puck will be 0.056 m/s.

Explanation: We are given 2 objects and are undergoing collision. The final velocity of both the objects is same. To calculate the final velocity, we will use the principle of conservation of momentum.

This principle states that when the objects that are colliding makes up a system, then the total momentum will remain constant if no external force is applied on it.

Sum of Initial momentum of two objects = Sum of Final momentum of the two objects

Mathematically,

m_1u_1+m_2u_2=m_1v_1+m_2v_2     ...(1)

where,

m_1,u_1\text{ and }v_1 are the mass, initial velocity and final velocity of the first object.

m_2,u_2\text{ and }v_2 are the mass, initial velocity and final velocity of the second object.

Here, man and hockey puck are moving together after the collision, so their final velocities will be same.

m_1=80.00kg\\m_2=0.16kg\\u_1=0m/s\\u_2=28m/s\\v_1=v_2=V=?m/s

Putting values in equation 1, we get:

80(0)+0.16(28)=(0.80+0.16)V

V=0.056m/s

The final velocity of man and hockey puck is 0.056 m/s.

6 0
3 years ago
Read 2 more answers
A susbtance has an empirical formula of CrO2 and a molecular weight of 168 g/mol. determine the molecualr formula for this subst
Sunny_sXe [5.5K]

Answer:

Cr_{2} O_{4}

Explanation:

\frac{molecular weight}{molar mass} =  \frac{168}{83.99} =  2.00

CrO_{2} x 2 = Cr_{2} O_{4}

3 0
3 years ago
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