CHEMISTRY MIDDLE SCHOOL

Henry divides 1.060 g by 1.0 mL to find the density of his water sample. How many significant figures should he include in thedensity value that he reports?

Answers

Answer 1

Answer:

Answer:

Explanation:

Density:

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

D= density

m=mass

V=volume

Symbol:

The symbol used for density is called rho. It is represented by ρ. However letter D can also be used to represent the density.

Given data:

Mass = 1.060 g

Volume = 1.0 mL

Density in correct number of significant figures= ?

Solution:

d = m/v

d = 1.060 g / 1.0 mL

d = 1.06 g/ mL

The density 1.06 g/mL contain three significant figures Henry should report it 1.1 g/mL having the only one digit after decimal because in given values 1.060 and 1.0 the least number of significant figures after the decimal is 1 that's why the final result must have one significant figure after decimal.

Answer 2

Answer:

Answer:

Explanation: There are three significant figures.

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How much smaller is an electron than a proton

Answers

Answer:

An electron is around 1800 times smaller than a proton

Explanation:

How does a graph with no trend differ from a graph with anomalous data points

Answers

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Line.30. The line perpendicular to point where a ray of light reflects is called the
a. angle of reflection
b. angle of incidence
c. normal
d. law of reflection

Answers

Answer:

c) Normal

Explanation:

Reflection is a phenomenon typical of light wave; it occurs when a ray of light hits the interface between two mediums, and bounces off back into the original medium, at a certain angle.

The direction of the reflected ray is determined by the law of reflection, which states that:

1) The incident ray and the reflected ray, together with the normal to the interface (the perpendicular to the interface), all lie within the same plane

2) The angle of incidence is equal to the angle of reflection:

$\theta_i=\theta_r$

where

$\theta_i$ is measured as the angle between the incident ray and the normal to the interface

$\theta_r$ is measured as the angle between the reflected ray and the normal to the interface

9. In a period, do the number of shielding electrons change? Why do you thinkor shielding electrons change? Why do you think atomic radius decreases across a
period?

Answers

Answer:

The nuclear charge increases, but the number of inner shielding electrons stays the same.

Explanation:

Their shielding does not change, so the effective nuclear charge — the charge felt by a valence electron — increases.

The valence electrons are pulled closer to the nucleus, decreasing the atomic radius.

For example, consider the elements of Period 3.

$\begin{array}{ccccc}& & \textbf{Number of} & \textbf{Inner} & \textbf{Valence}\n\textbf{At. No.} & \textbf{Symbol} & \textbf{Protons} & \textbf{Electrons} & \textbf{Electrons}\n11& \text{Na} & 11 & 10 & 1\n12& \text{Mg} &12 & 10 & 2\n13& \text{Al} & 13 & 10 & 3 \n14& \text{Si} & 14 & 10 & 4 \n15& \text{P} & 15 & 10 & 5\n16& \text{S} & 16 & 10 & 6\n17& \text{Cl} & 17 & 10 & 7\n18& \text{Ar} & 18 & 10 & 8 \n\end{array}$