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Answer:

add a major conductor

Explanation:

Answer:

Explanation:

sorry dont understand

Answer: D. The speed of rotation of the Earth on its axis

Explanation: How fast Earth spins determines the number of hours in a given day.

Answer: Inertia

Explanation:

Answer:

Hope this will help..........

Explanation:

Seawater desalination is the removal of salt and impurities from seawater to produce fresh water. Our desalination plants use a reverse osmosis process. ... The filtered seawater is then forced under pressure through special membranes whereby the osmosis process that normally occurs in nature is reversed

Answer:

Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.

Explanation:

To help Ming identify the non-polar compound, assuming the non-polar compound will have an odor test for it and most importantly, the non-polar substance should have a higher volatility due to its London dispersion forces.

Answer:

B

Explanation:

Answer:

In Chemistry, proteins are defined as biomolecules that are essential for the human body to maintain homeostasis. In a PCR test, short for Polymerase Chain Reaction test, scientists are tracking for a certain chemical substance in our body that may be present in the process of protein synthesis or DNA replication that could possibly show if a person is positive for the Corona Virus.Therefor, the relation between Chemistry and the PCR test is that, without Chemistry, the PCR test would not be able to stand on its own, which in other words means the PCR test is dependent upon the presence of Chemistry.

Answer:

6.72 g

Explanation:

Given data:

Mass of calcium chlorate = 13.8 g

Mass of oxygen produced = ?

Solution:

Chemical equation:

Ca(ClO₃)₂        →      CaCl₂ + 3O₂

Number of moles of calcium chlorate:

Number of moles = mass / molar mass

Number of moles = 13.8 g/ 206.98 g/mol

Number of moles = 0.07 mol

Now we will compare the moles of oxygen and  calcium chlorate.

                 Ca(ClO₃)₂         :            O₂

                      1                   :              3

                    0.07               :            3×0.07=0.21 mol

Mass of oxygen:

Mass = number of moles × molar mass

Mass = 0.21 mol × 32 g/mol

Mass = 6.72 g

Answer:

A

Explanation:

A: because for something to have kinetic energy it has to be in motion, the other 2 scenarios are not moving.

Answer:

Lithium

Explanation:

The element with electronic configuration of 2, 1 is helium.

In the electronic configuration, we are able to know that the total number of electrons the atom contains is 3. Also, the element has one electron in the outer most shell.

Elements with one valence electrons are the alkali metals.

Therefore, this configuration clearly matches Lithium.

Answer:

5 moles of oxygen occupy 120 dm³ volume.

Explanation:

Given data:

Number of moles = 5 mol

Volume of gas = ?

Solution:

In question it is given gas is at room temperature and pressure.

One mole of any gas at room room temperature and pressure occupy volume of 24 dm³. Thus,

5 mole of gas occupy volume of,

5 mol × 24 dm³/1 mol

120 dm³

5 moles of oxygen occupy 120 dm³ volume.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 0.917 × 2.5 = 2.2925

We have the final answer as

Hope this helps you

Answer:. 2.3 g

Explanation:

Answer:

At the Earth's surface, wind blows horizontally from high pressure to low pressure areas. The speed is determined by the rate of air pressure change, or gradient, between the two pressure areas. The greater the pressure difference, the faster the winds.

- sciencing

The Four Forces That Influence Wind Speed & Wind Direction

Explanation:

Answer:

It would be the first one, an overall positive charge on one end and overall negative charge on the other end.

Explanation:

Answer:

It's A.) A molecule that has an overall positive change in one end and an overall negative charge on the other

Explanation:

The definition of a polar molecule is a molecule with a negatively charged end and a positively charged end.

Answer:

answer is D

Explanation:

Answer:

67.6 years is the time the isotope take to decay from 0.900g to 0.170g

Explanation:

The radioactive decay follows first order law:

Ln [A] = -kt + ln[A]₀

Where [A] is concentration after time t,

k is decay constant:

k = ln 2 / t(1/2)

k = ln2 / 28.1 years

k = 0.02467 years⁻¹

[A]₀ = Initial concentration.

We can replace concentration and use the mass of the isotope:

Ln [A] = -kt + ln[A]₀

Ln [0.170g] = -0.02467 years⁻¹t + ln[0.900g]

-1.667 = -0.02467 years⁻¹t

t =

The time required for the sample to reduce to 0.170 grams has been 67.75 years.

Half-life can be defined as the times required by the substance to reduce to half of its initial concentration.

The half-life can be expressed as:

Amount left = Initial amount [tex]\times[/tex] [tex]\rm \dfrac{1}{2}^\dfrac{time}{Half-life}[/tex]

From the given:

0.17 g = 0.9 [tex]\rm \times\;\dfrac{1}{2}^\dfrac{t}{28.1}[/tex]

[tex]\rm \dfrac{0.17}{0.9}[/tex] = [tex]\rm \dfrac{1}{2}^\dfrac{t}{28.1}[/tex]

0.188 = [tex]\rm (0.5)^\dfrac{t}{28.1}[/tex]

Taking log on both the sides,

log 0.188 = [tex]\rm \dfrac{t}{28.1}\;\times[/tex] log 0.5

2.411 = [tex]\rm\dfrac{t}{28.1}[/tex]

t = 2.411 [tex]\times[/tex] 28.1 years

Time = 67.75 years.

The time required for the sample to reduce to 0.170 grams has been 67.75 years.

For more information about half-life, refer to the link:

https://brainly.com/question/24710827

Answer:

d.the gases x and y are elements ​

Explanation:

Since it is impossible to further break down the gases produced during this electrolytic process, we can conclude that the gases x and y are elements.

An element is a distinct substance that cannot be split up into simpler substances. Such substances are made up of only one kind of atom.

It is impossible through chemical reactions split an element into simpler units.

Answer: True

Explanation:

1 A

2 C

3 G

4 D

5 E

6 A and G

7 D and E  

8 F

9 B

10 C

11 if it is in motion and how much motion it has

12 a bow being pulled back shows potential and dropping a ball can chow kinetic

IM SO SRRY  don't feel bad

Answer:

I’m sad

Explanation:

Answer:

Explanation:

Elements

Answer:

hail, btw have a nice day

Answer:

Hail

Explanation:

I got it right on my test

Answer:

copper

Explanation:

Answer:

metal

Explanation:

I think it's D

Hope that helps

Answer: B, the bonding in the compound is nonpolar covalent.

Explanation:

This is because with the same electronegativity, there is an equal sharing of electrons, which indicates that the bonding must be nonpolar.

Answer: the molar mass will be too high

Explanation:

Answer:

B

Explanation:

Answer:

B. Always add the acid to the water slowly, taking a moment to stir between drops