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4 years ago

Explain how different states of matter are distinguished from each other and how pure substance distinguish from mixtures

1 answer:

7 0

Hello

The difference between the states of matter is explained as follows:
- a solid has a definite shape and a definite volume
- a liquid has a definite volume, but its shape changes depending on its container
- a gas does not have neither a definite volume nor a definite shape: both change depending on the container. In fact, a gas expands until it occupies the whole volume available.

The difference between a pure substance and a mixture is:
- a pure substance has a precise and definite chemical composition
- a mixture, instead, is a combination of two or more substances.

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Can someone help me??<br><br> A car travels 1026 km in 6 hours. Find its average speed.

tankabanditka [31]

The average speed of the car is 171.

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3 years ago

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A cross-country skier can complete a 7. 5 km race in 45 min. What is the skier’s average speed? km/h.

never [62]

The average speed is a scalar quantity. The average speed of the skier is 10 km/hrs.

<h3>What is the average speed?</h3>

It is calculated by dividing the total distance by the total time elapsed.

The

$\overline{v}={\frac{\Delta x}{\Delta t}}$

Where,

$\overline{v}$ = average velocity

${\Delta x}$ = displacement = 7.5 km

${\Delta t}$ = change in time = 45 min = 0.75 hours

Put the values in the formula,

$\overline{v}={\frac{7.5 }{0.75 }}\\\\\overline{v}= 10 \rm \ km/hrs$

Therefore, the average speed of the skier is 10 km/hrs.

Learn more about average speed:

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8 0

3 years ago

Change the speed 0.200cm/s to units of kilometers per year .

salantis [7]

0.200cm= 0.002km

0.002*60=0.12km/min

0.12*60=7.2km/h

7.2*24=172.8km/day

172.8*365=63072km/year

3 0

4 years ago

1. A golf ball is hit at an angle of 40 degrees to the horizontal at a velocity of 24 m/s. Calculate the Viy.

WITCHER [35]

Answer:

See the answers below

Explanation:

In order to solve these problems, we must decompose the magnitudes of the velocities on the x & y-axes, using the angles that are given. It is important for a better understanding to look at the attached image and understand how the angles are located relative to the horizontal axis.

The horizontal component of the angle can be found with the cosine function. While the vertical component can be found using the sine function of the angle.

Viy = 24*sin (40)

Viy = 15.42 [m/s]

The horizontal component of the angle can be found with the cosine function.

Vix = 24*cos(40)

Vix = 18.38 [m/s]

Vix = 55*cos(25)

Vix = 49.84 [m/s]

3 0

3 years ago

Trey is conducting an experiment to determine which fish food causes the most goldfish activity over a period of two weeks. He i

mr_godi [17]

Answer:

This question is incomplete as it lacks options, the options are:

Which change would be the most effective way to improve the validity of this experiment?

A) Increase the number of goldfish in each tank.

B) Increase the daily amount of food for each tank.

C) Create another group that is fed regular fish food.

D) Increase the number of tanks in each treatment group.

The answer is C

Explanation:

According to this question, an experiment is conducted by Trey to determine which fish food causes the most goldfish activity over a period of two weeks. In this experiment, the independent variable is the FISH FOOD which are; Swift Salmon food and Fast Flounder food. Other variables such as type of gold fish, amount of fish food, amount & type of water etc.

One of the ways to improve an experiment, which is lacking in this case is to have a CONTROL GROUP. Based on the fish foods used for each group, it is obvious that all groups in this experiment are experimental. Hence, creating another group that is fed regular fish food will serve as the CONTROL GROUP in order to compare with the experimental groups. This will improve the validity of the experiment.

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3 years ago

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