The magnifying power of a telescope is computed by dividing the focal length of its objective by _______.

Answer:

Option D. Decomposition reaction

Explanation:

MgBr₂ (s) —> Mg (s) + Br₂ (l)

To know which option is correct. It is important that we have an understanding of what each option means.

1. Synthesis reaction: This is a type of reaction in which two different elements react to produce a new compound different from the two elements that reacted. e.g

A + D —> AD

2. Combustion reaction: This is a reaction which involves a compound and oxygen to produce carbon dioxide (CO₂) and water (H₂O) e.g methane (CH₄) undergoes combustion reaction as follow:

CH₄+ 2O₂ —> CO₂ + 2H₂O

3. Single Replacement reaction: This is a reaction in which one element replaces or displaces another element in a single compound. This is illustrated below:

X + WZ —> XZ + W

We can see that the X replaces W in the reaction.

4. Decomposition reaction: This is a type of reaction in which a compound decompose or breaks into two or more simple compounds or elements e.g

ZX₄ —> Z + 4X

From the above illustrations, we can conclude that the the reaction:

MgBr₂ (s) —> Mg (s) + Br₂ (l)

Is a decomposition reaction because MgBr₂ breakdown into Mg and Br₂

Answer:

it runs the risk of triggering earthquakes. releases harmful gases

Answer:

The girl is 300N as she is staying still, and not buried in the ground or flying, hence, it has to be the same as the force pushing down. Sorry, can't answer about the rocket one.

Explanation:

The chemical formula for copper (II) phosphate is Cu₃(PO4)₂. The charge on each copper ion is +3. Therefore, option E is correct.

The term chemical formula is defined as the constituent components of a compound together with the number of atoms in each element's smallest unit, such as a molecule or formula unit.

Given a chemical formula, we may name simple compounds by using the names of the components and a few simple principles.

The simplest whole-number ratio of the atoms in a compound is demoed by empirical formulae, the number of each type of atom in a molecule is shown by molecular formulas, and the bonds between the atoms in a molecule are shown by structural formulas.

The charge on each copper ion is +3,the subscripts balance the electrical charge.

Thus, option E is correct.

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Answer:

B. Halogen

Explanation:

Halogens are the family of chemical elements found in the group VIIA of the periodic table which means they possess seven (7) outer electrons. Some examples of halogens are Fluorine (F), Iodine (I), Bromine (Br), and Chlorine (Cl).

A halogen, or an element located in group 7A, will form a salt when reacted with a metal atom.

For example, when Chlorine reacts with Sodium it would form a salt known as Sodium Chloride.

Na + Cl ----> NaCl

Answer:

A) Abosrbed

Explanation:

The change is endothermic, meaning the material absorbs energy when it changes its phase from a solid to a liqiud.

Answer:

Ununennium.

Explanation:

Ununennium, also known as eka-francium or element 119, is the hypothetical chemical element with symbol Uue and atomic number 119. It's Mass number is [315] (predicted), as we as it is existing on the periodic table hence its symbol: Uue

Answer B

Explanation:

hereI wpould put it on t

Answer:

Gases, liquids, and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. Gas is well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation:

Answer:

Tyra can make 53 batches

Explanation:

Given

[tex]Batches = \frac{1223}{r}[/tex]

Required

Find the number of batches when r = 23

To do this, we simply substitute 23 for r in [tex]Batches = \frac{1223}{r}[/tex]

So, we have:

[tex]Batches = \frac{1223}{23}[/tex]

[tex]Batches = 53.17[/tex]

Approximate:

[tex]Batches = 53[/tex]

Answer:

she should add salt to the mixture

Explanation:

salt is easily able to dissolve

7.4797 g AlF₃

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Stoichiometry

Step 1: Define

[RxN] 2AlF₃ + 3K₂O → 6KF + Al₂O₃

[Given] 15.524 g KF

Step 2: Identify Conversions

[RxN] 2 mol AlF₃ = 6 mol KF

Molar Mass of Al - 26.98 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of K - 39.10 g/mol

Molar Mass of AlF₃ - 26.98 + 3(19.00) = 83.98 g/mol

Molar Mass of KF - 39.10 + 19.00 = 58.10 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 5 sig figs.

7.47966 g AlF₃ ≈ 7.4797 g AlF₃

Answer:

7.4798

Explanation:

i just did the quiz, the guy above me is wrong.

Boyle's law states that the pressure of the given quantity inversely varies with its volume at a constant temperature.

Answer:

Conserved.

Explanation:

Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.

Mathematically, momentum is given by the formula;

[tex] Momentum = Mass * Velocity [/tex]

The law of conservation of momentum states that the total linear momentum of any closed system would always remain constant with respect to time.

This ultimately implies that, the law of conservation of momentum states that if objects exert forces only on each other, their total momentum is conserved.

Answer:

A: A substance that can be separated into two or more substances only by chemical means.

Explanation:

The best answer for this would be A. A compound in general is when two or more elements are bonded chemically. That is, the elements are joined in a chemical reaction. An example of a compound is table salt; (sodium chloride) NaCl. It, like all chemicals, can be separated into both of its components, so B is out. The other two answers basically say is it either only chemical or physical means that can separate it, when the answer is that it is only chemical changes that can separate a compound. There can be a reaction when a compound is broken up. You might think that you can separate salt crystals with a hammer or some physical force, but that's only the salt lattice, not the Na and Cl coming apart. Also, for the compound water, H2O, the Hydrogen and Oxygen can be separated by running an electric current through the water sample. This chemically alters the water molecule and splits it up, which is a chemical change. So, to sum up here, you can only use chemical means to separate a compound. Take care!

A compound is a substance that can be separated into two or more of its constituents by chemical methods. So the correct option is A.

Any material made up of similar molecules with atoms from two or more different chemical elements is referred to as a chemical compound.

Atoms from more than 100 distinct chemical elements, both in their pure forms and when mixed to create chemical compounds, make up all matter in the universe. A sample of a pure element has just the atoms that are distinctive of that element, and each element's atoms are distinct.

For instance, the atoms that make up carbon differ from those that make up iron, which differs from those that makeup gold. Every element has a distinct symbol that is made up of one, two, or three letters that come from either the element's current name or its original name.

Therefore the correct option is A.

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Answer:

Hello  there!

The first answer is hot

The second answer is sunshine!

Explanation:

Those make the most sense

Have a great day!

Answer:

bran fart is kewl

Explanation:

yes

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Answer:

In both natural and built systems, stability and change are an important focus of study for both scientists and engineers. Stability refers to a system that is unchanging. ... A dynamic equilibrium exists when chemical reactions or physical movements occur at rates that balance out, creating no net change in a system.

Explanation:

Answer:

False, the empirical formula denotes the smallest whole-number ratio of atoms in a compound

Explanation:

a molecular formula is the total number of atoms in the compound

The velocity after 5 second =19 m/s

Given

Initial velocity =vi = 12 km/h=3.3 m/s

Time=t = 5 s

Acceleration=a = 2 m/s²

Required

Final velocity, vf

Solution

Motion with constant acceleration

Can be formulated :

vf=vi+at

Input the value :

vf=3.3+2.5

vf=9+10

vf=19 m/s

Pair of compounds have the same empirical formula :C₂H₂ and C₆H₆

Given

Carbon compound

Required

The same empirical formula

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

(empirical formula) n = molecular formula  

C₂H₂ and C₆H₆

Empirical formula CH

(CH)₂=C₂H₂

(CH)₆=C₆H₆

C₂H₆ and C₃H₈

C₂H₆: Empirical formula CH₃

C₃H₈: Empirical formula C₃H₈

C₂H₅OH and CH₃OH ⇒ Empirical formula

CH₃CHO: Empirical formula : CH₃CHO

CH₃COOH: Empirical formula CH₂O

Answer:

pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral.

Properly converted : 6 km = 6000000 mm

Given

Conversion of units

Required

Proper conversion

Solution

In converting units we must pay attention to the conversion factor between units

Let kg to g, then the conversion factor is 10³

1. L to mL = 10³

2000 L to ml = 2.10⁶ ml

wrong conversion

2. cm to mm = 10

5.25 cm = 52.5 mm

wrong conversion

3. mg to g = 10⁻³

35 mg = 35 x 10⁻³ g = 3.5 x 10⁻⁴ g

wrong conversion

4. km to mm = 10⁶

6 km = 6 x 10⁶ mm

proper conversion

The empirical formula :

MgCl₂

Li₂O

Given

a 3.60 g of magnesium and 10.65 g of chlorine

b 9.1 g of lithium and 10.4 g of oxygen

Required

The empirical formula

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.

A molecular formula is a formula that shows the number of atomic elements that make up a compound.

(empirical formula) n = molecular formula

a. mol ratio of Mg (Ar=24 g/mol) and Cl(Ar=35.5 g/mol)

Mg : Cl

=3.6/24 : 10.65/35.5

=0.15 : 0.3 = divide by 0.15

=1 : 2

The empirical formula : MgCl₂

b. a. mol ratio of Li (Ar=7 g/mol) and O(Ar=16 g/mol)

Li : O

=9.1/7 : 10.4/16

=1.3 : 0.65 = divide by 0.65

= 2 : 1

The empirical formula : Li₂O

Answer:

premium: 91 octane rating

Explanation:

Octane number refers to the percentage or volume fraction of isooctane in a fuel.

The octane number gives a picture of how safe a fuel is for an engine. The higher the octane rating the lesser the tendency of the fuel to cause knocking of the engine.

The type of gasoline with the highest percentage of octane among the options is premium.

Answer:

b

Explanation:

Answer:

Principia

Explanation:

Answer:mass

Explanation:

Answer:

weight is the measure of the force of gravity pulling on the object. mass is the measure of the object's matter.

Answer:

B. Divergent

Explanation:

Rift valleys are usually formed at divergent margins where fractures in the earth's crust widens.

The fracture widens due the pulling apart of the plates that are involved.

Answer:

A. Chromosome

Explanation:

Chromosomes carry the genetic info, and the nucleus stores it.

Hope this helps :D