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3 years ago

Why is it necessary to include units when reporting scientific measurements?

2 answers:

8 0

Answer/ Explanation: you always want to keep track of your units especially during conversions because if you’re measuring liquids and you end up with meters for your final conversion, somethings wrong. Also, it’s important to show what you’re measuring. If you just answer 5.34 and leave out the units, no one knows what’s you measured. Dogs? Trees? Centimetres?

Kay [80]3 years ago

5 0

Without units, the results of your measurement would be unclear and it would be hard to know what each seperate measurement is telling you.

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Write a balanced equation for the reaction of ca with hcl

Aleksandr-060686 [28]

Ca(s)+2Hcl(aq) ------>CaCl2(s)+H2(g)

3 0

3 years ago

The Earth’s atmosphere is divided into five layers. In which layer does all life exist?

n200080 [17]

Answer:

1. troposphere

2. less dense/decreases

3. ozone

4. nitrogen

5. xylem

6. flagellum

7. kingdom fungi

8. Ocean convection currents

9. As they fly, insects spread pollen that sticks to their bodies from the flowers.

10. the plastic handle, because it is a good insulator.

11. The hyphae, or feeding structures, reach deep into the wood to obtain nutrients

12. chemical energy

13. created or destroyed.

14. electromagnet

15. c

16. kinetic, elastic potential

5 0

3 years ago

Bromine has two isotopes 79Br and 81Br, whose masses (78.9183 and 80.9163 amu) and abundances (50.69% and 49.31%, respectively)

Reika [66]

Answer:

Average atomic mass = 79.9034 amu

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

% = 50.69 %

Mass = 78.9183 amu

For second isotope:

% = 49.31 %

Mass = 80.9163 amu

Thus,

$Average\ atomic\ mass=\frac{50.69}{100}\times {78.9183}+\frac{49.31}{100}\times {80.9163}\ amu$

$Average\ atomic\ mass=40.0036+39.8998\ amu$

Average atomic mass = 79.9034 amu

4 0

3 years ago

0.750mol of gas are stored in a tank at a pressure of 275kpa and a temperature of 0.00 degrees * C What is the volume of the tan

nordsb [41]

Answer:

The volume on the tank is 6, 20 L

Explanation:

We use the formula PV=nRT. We convert the units of pressure in kPa into atm and temperature in Celsius into Kelvin:

0°C=273K

101,325kPa---1 atm

275kPa --------x=(275kPax 1 atm)/101,325kPa= 2,71 atm

PV=nRT --> V=nRT/P

V= 0,750 mol x 0,082 l atm /K mol x 273 K/ 2, 71 atm= 6, 20 L

4 0

3 years ago

Is mercury a solution

Dvinal [7]

Answer:

No.

Explanation:

Mercury is not a solution. It is a detonator.

4 0

4 years ago