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Chemistry

1 answer:

lorasvet [3.4K]3 years ago

8 0

The mean temperature change is calculated by dividing the sum of the temperature changes by the number of trials. This questions say exclude the anomalous result which I assume is test 2, which gave a temperature change of 7.3. I will exclude this test. The mean will therefore be (9.5+9.2+9.5)/3 = 9.4. The mean temperature change is 9.4 C.

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The pressure of a compressed gas is 1.45 atm. What is this<br> pressure in kPa?<br> kPa

klemol [59]

Answer:

146.885 kPa

Explanation:

1 atm= 101.3 kPa =1.013 barr= 760 torr = 760 mmHg= 14.7 psi

So to convert atm to kpa we would multiply 1.45 by 101.3 which gives us 146.885.

1.45atm× $\frac{101.3 kPa}{1 atm}$ =146.885 kPa

6 0

3 years ago

What three parts make up an atom?

MissTica

The nucleus of an atom is made up of protons and neutrons. Then electrons circle around the nucleus.

Answer:

Proton, Neutron, Electron

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3 years ago

Read 2 more answers

Distinguish between dunes and loess

agasfer [191]

Answer:

Dunes are loose sand hills.

Loess is a compacted wind-blown formation of sediment.

Explanation:

Sand dunes are, as their name implies, made of sand which is itself made of tiny quartz pieces. Sand dunes are present where there is a ready source of broken down sandstone or other type of rock and wind to transport the sand. The dunes are mobile and loose and migrate over time.

Loess comes in vast formations and was created in a very different way. In the last ice age, winds from the north carried sediments loosened and ground by glaciers southwards. There, the sediments accumulated in large formations and became compacted over time.

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3 years ago

QUESTION THREE

BartSMP [9]

Answer:

Odds to be given for an event that either Romance or Downhill wins is 11:4

Explanation:

Given an odd, r = a : b. The probability of the odd, r can be determined by;

Pr(r) = $\frac{a}{b}$ ÷ (