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3 years ago

Using proper units is important when recording data. In this lab, you determined three properties of the objects: mass,

Chemistry

2 answers:

Delicious77 [7]3 years ago

8 0

The units used for mass were kilogram (kg)

The units used for volume were cubic metres (m³)

The units used for density were kilogram per cubic metres (kg/m3).

When carrying out a research or experiment in a laboratory, your data should be recorded using standard units.

These units are called S.I. units or International system of units. They are the globally-agreed system of measurement units.

The properties of an object with its SI unit include:

Mass: This is the quantity of matter that is found in an object which is always constant. The SI unit of mass is Kilogram (kg).

Volume: This measures the space occupied by an object. The SI unit of volume is cubic metres (m³).

Density: This is mass of a unit volume of an object. The SI unit of density is kilogram per cubic metres (kg/m3).

Learn more here:

brainly.com/question/17686239

SVEN [57.7K]3 years ago

6 0

Answer:

1)grams 2) cubic centimeters 3) grams/cubic centimeters

Explanation:

I just put it in <3

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Answer what you can please. The most accurate will get brainliest. High rating and Many thanks.

Elina [12.6K]

The correct answer for #8 is:

C. The original pattern of the light is distorted.

3 0

4 years ago

Calculate the ph at the equivalence point for the titration of 0.230 m methylamine (ch3nh2) with 0.230 m hcl. the kb of methylam

Vlad1618 [11]

Answer: The pH at the equivalence point for the titration will be 0.65.

Solution:

Let the concentration of $[OH^-]$ be x

Initial concentration of $[CH3NH_2]$ , c = 0.230 M

$CH_3NH_2+H_2O\rightleftharpoons CH_3NH_3^++OH^-$

at eq'm c-x x x

Expression of $K_b$ :

$K_b=\frac{[CH_3NH_3^+][+OH^-]}{[CH_3NH_2]}=\frac{x\times x}{c-x}=\frac{x^2}{c-x}$

Since ,methyl-amine is a weak base,c>>x so $c-x\approx c$ .

$K_b=\frac{x^2}{c}=5.0\times 10^{-4}=\frac{x^2}{0.230 M}$

Solving for x, we get:

$x=1.07\times 10^{-2} M$

Given, HCl with 0.230 M , it dissociates fully in water which means $[H^+]$ = 0.230 M

$[OH^-]=[H^+]$ will result in neutral solution, since $[OH^-]$

Remaining $[H^+]$ after neutralizing $[OH^-]$ ions

$[H^+]_{\text{left in solution}}=[H^+]-[OH^-]=0.230-1.07\times 10^{-2}=0.2193 M$

$pH=-log{[H^+]_{\text{left in solution}}=-log(0.2193)=0.65$

The pH at the equivalence point for the titration will be 0.65.

8 0

4 years ago

The atomic number of manganese (Mn) is 25. What's the electron configuration for manganese?

vodomira [7]

Answer:

$\boxed{\sf D. \ [Ar] \ 3d5 \ 4s2}$

Explanation:

Manganese is a group 7 transition metal with an electronic configuration of [Ar] 3d5 4s2.

7 0

3 years ago

Read 2 more answers

Consider the reaction:

devlian [24]

Gosh, I love chem!

[H2O]/t should be 0.085M/s

this is because of the coefficients in front of H2S and H2O being the same.

the significance of this answer is that the H2S disappears at the same rate H2O appears.

8 0

4 years ago

2. Tincture of iodine has antiseptic properties. This solution is made by dissolving

Fittoniya [83]

Answer:

(b) Tincture of iodine is made by dissolving iodine in alcohol

4 0

3 years ago