is mesosphere is where most of meteoroids begin to burn?

Answer:

24.68 g/cm³

Explanation:

We'll begin by calculating the volume of the marble. This can be obtained as follow:

Volume = 17 × 23 × 4

Volume = 1564 cm³

Next, we shall convert the mass of the marble (i.e 38.6 kg) to grams (g). This can be obtained as follow:

1 kg = 1000 g

Therefore,

38.6 kg = 38.6 kg × 1000 g / 1 kg

38.6 kg = 38600 g

Therefore, 38.6 kg mass of the marble slab is equivalent to 38600 g.

Finally, we shall determine the density of the marble slab as follow:

Volume = 1564 cm³

Mass = 38600 g.

Density =..?

Density = mass /volume

Density = 38600 g / 1564 cm³

Density = 24.68 g/cm³

Therefore, the density of the marble slab is 24.68 g/cm³

Answer:

hope this helps!!

MOLES OF ELEMENTS IN A FORMULA

type of element. For example, in a molecule of aspirin, C9H8O4, there are 9 carbon atoms, 8 hydrogen atoms and 4 oxygen atoms. compound. For example, one mole of aspirin contains 9 moles of carbon atoms, 8 moles of hydrogen atoms and 4 moles of oxygen atoms.

Explanation:

Answer:

Yes

Explanation:

Chemical reactions often involve changes in energy due to the breaking and formation of bonds. Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

Exothermic reaction - A chemical reaction in which heat energy is given out .

Buring of natural gas , respiration, formation of compost from vegetables matter also exothermic processes.

Examples

C(s)+O2(g)⸻➤CO2(g)+94.00kcal

2H2(g) +O2(g)⸻➤2H2O(l) +136.0kcal

Endothermic reaction - A chemical reaction in which heat energy is absorbed is called endothermic reaction.

Example

C(s)+2S⸻➤CS(l)-22kcal

C(s)+H2O⸻➤CO(s) +H2(s)-31.4 kcal

{ ⸻➤at 1100°C }

Atoms consist of three basic particles: protons, electrons, and neutrons. The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged).

Answer:

B: Radiant

Explanation:

E2021...I got you guys

Answer:

radiant

Explanation:

Answer:

mirrors do not have a color, many people believe they are green because they reflect the most green light back into our eyes.

Answer:

Density, mass of a unit volume of a material substance

Explanation:

Answer:

Hello!

Explanation:

Density: The degree of compactness of a substance.

happy to help!

Explanation:

density can be calculated using the following rule: density=mass/volume

therefore,

mass = density x volume

we have density 8.9gm/cm³ and volume=3cm³ substituting in the above equation, we can calculate the mass as follows:

mass = 8.9 x 3 = 26.7 grams,

Approx 27 grams

27 g is your answer

Answer:

density =8.9g/cm³

Explanation:

1cm³=8.9g

3cm³=8.9×3=26.7g

Answer: The kind of bond is a covalent bond.

Explanation: The two atoms on top are separated or not together while the other is.  the two atoms on top are negative while only one molecule on the bottom is negative. And, the top pair is atoms and the bottom pair is molecule

Answer:

Atoms are the smallest particle that an element can be divided in to. When atoms come together, they form molecules and molecules start to create everything around you.

Atoms are the smallest particles of matter which on combining with atoms of the same type give rise to molecules.

Matter is a substance which is made up of various types of particles  which occupy space and have inertia . All living things and objects  are made up of various types of particles  that occupy space and have inertia .

Depending on temperature and other factors matter is able to exist in different phases. Most common of which are solid, liquid and gas. Matter can exist in more than one state depending on the temperature  and pressure .

State of matter can be changed  by heating or cooling and even by changing the applied pressure.When a state changes matter does not break rather its state changes though its chemical composition remains same.

Physical characteristics of matter are shape, color, size and temperature. Every matter is made up of elements which  cannot be broken down further by ordinary chemical reactions.

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Answer:

Explanation:

Scrontium (Sr) is a metal in group 2 of the periodic table. While chlorine (Cl) is a nonmetal (halogen) in group 7 of the periodic table. Generally, elements in this two groups of the periodic table react together to form an ionic/electrovalent compound as illustrated in the question (shown below).

Sr + Cl₂ ⇒ SrCl₂

Because, members of group 2 react well with halogens to form an ionic/electrovalent compound, Sr can also react with iodine (I₂) or bromine (Br₂), any of which can be our X₂ (because the reactions are similar to that of how Cl₂ react), as shown below

Sr + I₂ ⇒ SrI₂

Sr + Br₂ ⇒ SrBr₂

A molecule, X₂, that is likely to react with Sr in a way similar to how Cl₂ reacts with Sr is F₂

Scrontium (Sr) is an Alkaline earth (i.e group 2) metal. It has 2 valence electrons and form bond by losing the two valence electrons.

Sr —> Sr²⁺ + 2e¯...... (1)

Chlorine (Cl) is a group 17 element (i.e Halogen). It has 7 valence electrons and form bond by accepting electron 1 to completely its octet configuration.

Cl + e¯ —> Cl¯.... (2)

Combining equation 1 and 2, we have

Sr + 2Cl + 2e¯ —> Sr²⁺ + 2Cl¯ + 2e¯

Cancel out 2e¯

Sr + 2Cl —> Sr²⁺2Cl¯

Sr + Cl₂ —> SrCl₂

NOTE: Group members has similar chemical properties. Therefore, other members of group 17 (i.e fluorine, bromine, iodine) can under go similar reaction with Scrontium (Sr).

Sr —> Sr²⁺ + 2e¯...... (1)

F + e¯ —> F¯.... (2)

Combining equation 1 and 2, we have

Sr + 2F + 2e¯ —> Sr²⁺ + 2F¯ + 2e¯

Cancel out 2e¯

Sr + 2F —> Sr²⁺2F¯

Sr + F₂ —> SrF₂

Thus, fluorine molecule, F₂, will react with Sr in a way similar to how Cl₂ react.

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Answer: i think 250ML

Explanation:

Litmus paper can't accurately determine how acidic or alkaline a substance is because the results are qualitative (observable), not quantitative (measurable).

Mechanism. It contains a mild acid, red litmus. The hydrogen ions interact with the additional base when it is in contact with a basic substance.

The moist red litmus paper turns blue when placed in an alkaline solution because the conjugate base that is created from the litmus acid has a blue.

Chemistry uses a litmus or litmus paper test to detect if a solution is basic or acidic. Some lichen species are the source of litmus.

When exposed to an acid, litmus will turn red; when exposed to a base, it will turn blue.

Therefore, statements a meets the criteria of a scientific hypothesis.

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Answer:Increase the enzyme concentration

Explanation:

If the enzyme is saturated, it simply means that all the enzyme molecules present has been bound to substrates.

Of course, there will still be more substrates left in the system since the enzyme is saturated. The reaction rate can now be increased by increasing the enzyme concentration so that more enzyme molecules can be bound to substrates.

Answer:

1.11 M NaCl

Explanation:

Quizlet???

Answer: A. It can identify the elements in the sample.

Explanation: on edge

Spectroscopy is the technique used in analytical chemistry. An unknown sample can be identified by spectroscopy as it can determine the elements. Thus, option A is correct.

Spectroscopy is an analytical technique that can determine the atomic and molecular structure of the sample by the method of absorption and emission of the energy by the particles of the matter.

The particles or the atomic elements absorb the electromagnetic radiation from the source and emit a specific spectrum or wavelength that is a characteristic of an element.

This spectrum allows the deduction of the structural details and the electronic configuration that is used to know the element or the atom present in an unknown sample.

Therefore, option A. spectroscopy can identify the elements in the unknown sample.

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Answer:

ok

Explanation:

Which properties change the composition of a substance?

A. chemical properties

B. chemical and physical properties

C. physical properties

D. neither chemical nor physical properties

Answer:

chemical properties

Explanation:

chemical properties did change the composition of substance, so it cannot go back to original anymore, such as burning, rusting, etc.

I took the test before. I got all the answer correct and got 100% score.

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Learning Properties of Matter Quiz Unit 2 Lesson 11 Grade 8

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Answer:

Explanation:

First count the protons. I think there are 10 of them. That pretty much locks it in. The atom must be Neon.

All the electrons are in the first 2 rings and there are 10 all together.

Neon

Answer:

Explanation:

-"If he wanted to keep 'em after he was dead, a wicked old screw," pursued the woman, "why wasn’t he natural in his lifetime? If he had been, he'd have had somebody to look after him when he was struck with Death, instead of lying gasping out his last there, alone by himself."

This is showing that if he hadn't be so selfish and righteous, then he would not have been alone to die without anyone there to help or comfort him.  In the line, "why wasn't he natural in his life?", is asking why he wasn't a nice person.  Why didn't he help others.  If he had helped others, he would not have been so alone.A story set during a major battle, as both have a sudden rush of events.

Answer:

Promotes Stellar Formation:

-Increased Gravitational Attraction

-Higher Temperature

Does Not Promote Stellar Formation:

-Decreased Gravitational Attraction

-Lower Temperature

Explanation:

Stars need at least three million kelvins to form, and the gravitational attraction helps form the star in the first place.

The physical conditions that are necessary to support nuclear fusion and formation of stars are divided into two headings. They are:

Promotes Stellar Formation:

Does Not Promote Stellar Formation:

There are some conditions that needs to be put in place before Nuclear Fusion can occur. It often needs temperatures of about 100 million Kelvin.

The ions have to be placed together in close proximity to allow fusion to take place between them.

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Answer: Positive ions that have lost an electron are smaller than their neutral atoms. Negative ions that have gained an electron are larger than their neutral atoms.

Explanation: I found this in my chemistry textbook.

Neutral atoms increase in size down a group and decrease across a period.

If neutral atom gains or loses an electron, forming anion or cation, increase or decrease in radius occurs and this trend differs from that of atomic radii.

Atomic radius or Radii is defined as the total distance from the nucleus of the atom to the outermost orbital of its electron, similar to radius of a circle.

The determination of  the atomic radii is difficult due to the uncertainty in the position of the outermost electron, so Heisenberg’s Uncertainty Principle is applied to obtain a precise measurement of the radius.

An atom also show different radii depending on the type of  bond, hence there is no fixed radius of an atom.

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Hand sanitizers are not effective to be used for cleaning clothes are they can lead to spots.

Hand sanitizers can cause smirch-like flaws on clothing. Some contain alcohol, a known stain remover. When the sanitizer comes into contact with clothing, it can dispose of the assortment from the surface. The engravings are known as blurring spots.

Thus, for washing clothes detergents are used due to their properties.

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Answer:

1. 749.6

2. 159.8

3. 60.4

4. 19,840,275

5. 8.029118938015202

6. 267.984

7.  1,017.169517

8.  45,945

9.   28,710

10.  14.42169022209403

11.    0.1341

and that is all that I am going to give you for the last few try to use a calculator    

Explanation:

use a calculator

Answer:

8. 3.24 kg

9. 6.31 litres/minute.

10a. 15.3 m³

10b. $ 612.

Explanation:

8. Determination of the kilogram of feed eaten by the pig per day.

From the question given,

The pig consumed = 50 lb bags

Duration = 1 week

Consumption per day =..?

Next, we shall convert 50 lb to kg. This can be obtained as follow:

1 lb = 0.454 Kg

Therefore,

50 lb = 50 lb × 0.454 Kg/ 1 lb

50 lb = 22.7 kg

Next, 1 week us equivalent to 7 days.

Thus, the pigs consumed 22.7 kg of feed in 7 days. Therefore, the pigs will consume X kg of feed in 1 day i.e

X kg of feed = 22.7/7

X kg of feed = 3.24 kg

Therefore, the pigs will consume 3.24 kg of feed per day.

9. Determination of the rate in litres/minute.

Rate = 100 gallon/hour

Rate (litres/minute) =?

We'll begin by converting 100 gallon/hour to litre/hour. This can be obtained as follow:

1 gallon/hour = 3.785 litres/hour

Therefore

100 gallon/hour = 100 × 3.785

100 gallon/hour = 378.5 litres/hour

Finally, we shall convert 378.5 litres/hour to litres/minute. This can be obtained as follow:

1 litre/hour = 1/60 litre/minute

Therefore

378.5 litres/hour = 378.5 × 1/60

378.5 litres/hour = 6.31 litres/minute.

Therefore, 100 gallon/hour is equivalent to 6.31 litres/minute.

10a. Determination of the concrete in m³.

Concrete needed = 20 yd³

Concrete needed (in m³) =...?

1 yd³ = 0.765 m³

Therefore,

20 yd³ = 20 yd³ × 0.765 m³/ 1 yd³

20 yd³ = 15.3 m³

Therefore, 20 yd³ is equivalent to 15.3 m³

10b. Determination of the cost spent on the wall. This can be obtained as follow:

1 m³ = $ 40

Therefore,

15.3 m³ = 15.3 m³ × $ 40 / 1 m³

15.3 m³ = $ 612

Therefore, $ 612 will be spent on the wall.

Answer:

The answer is Rubidium

Explanation:

The number of protons is unique for each element. It is also identified as an element’s atomic number. Look for an element with the number of protons as the atomic number to find the unidentified element.

Answer:

Hello again, I think the option will be the third one Rubidium im highly sure because the periodic table goes by the number of protons which in your question is 37. So yeah it will be rubidium.

Explanation:

Look for 37 protons in the periodic table.

Answer:

Chromium (Cr) and Copper (Cu)

Explanation:

Chromium (Cr) and Copper (Cu) have electron configurations different from what the rules predict in period 4.

Electronic configuration, also called electronic structure, is the arrangement of electrons in energy levels around an atomic nucleus.

The order of filling of electrons occupying the 3d subshell gets concerned in chromium and copper and because of distress in 3d subshell, these elements possess exceptional configuration.

Hence, Chromium (Cr) and Copper (Cu) have electron configurations different from what the rules predict in period 4.

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