Please help me thanks so much!?!?

Answer:

fluorine

Explanation:

it has the highest electronegativity in the group and in the periodic table

Answer:

JOSHUA

Explanation:

JOSHUA

Answer:

Distance lift the tree = 0.5 m

Explanation:

Given:

Work done = 50 joules

Force = 100 newton

Find:

Distance lift the tree

Computation:

Distance = Work done / Force

Distance = 50 / 100

Distance = 0.5 m

Distance lift the tree = 0.5 m

Answer:

d) An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity increases because the arsenic atom loses the electron.

Explanation:

This is an example of a n-type semiconductor. The additional electron introduced to the 'grid' of silicon atoms causes an increase in the conductivity of the silicon. This additional electron is introduced as arsenic loses its extra electron.

Answer:

D is the answer, the other one is wrong.

Explanation:

Answer:

Ca(OH)2 + HCI

Explanation:

Calcium hydroxides formula is: Ca(OH)2

Hydrochloric Acids formula is : HCI

Please rate and give thanks!

Answer:

3

Explanation:

For numbers with decimals, count the number after the decimal.

Answer:

Ge is more electronegative

Explanation:

the ph is gonna be your value and the 4 is gonna be your main subject

so as the ph is your value u gonna ad your ph and 7 and 4 toghter then multiple your answer 2 times  because ph represent multiple and your value  

Answer: The density of this nugget is [tex]7\text{ g cm}^{-3}[/tex] .

Explanation:

We are given that,

Mass of nugget = 63 g

Volume = [tex]9\ cm^3[/tex]

The computation of density of a substance is given by :-

[tex]\text{Density}=\dfrac{\text{Mass}}{\text{Volume}}\\\\\Rightarrow\ \text{Density}=\dfrac{63}{9}\text{ g cm}^{-3}[/tex]

[tex]\Rightarrow\ \text{Density =}7\text{ g cm}^{-3}[/tex]

Therefore, the density of this nugget is [tex]7\text{ g cm}^{-3}[/tex] .

Answer:

m = 25.98 g

Explanation:

Given data:

Density of copper metal = 8.96 g/mL

Volume of copper metal block = 2.90 mL

Mass of copper metal block = ?

Solution:

The volume of given block of copper is equal to the volume change of water by adding this block.

Density formula:

d = m/v

by putting values,

8.96 g/mL = m/ 2.90 mL

m = 8.96 g/mL × 2.90 mL

m = 25.98 g

Answer:

yes it is a chemical reaction

Explanation:

because the substances combined and made something new

The question is incomplete, the complete question is found in the image attached.

Answer:

1- acceptor

2-donor

3-acceptor

4-donor

Explanation:

A hydrogen bond acceptor is a molecule that has an electronegative atom having a lone pair of electrons that participates in the hydrogen bond.

A hydrogen bond donor is the molecule that supplies the hydrogen atom of a hydrogen bond.

If we look at structure I-IV in the image attached, I and III are hydrogen bond acceptors because they all possess electronegative atoms having lone pairs of electrons but do not have hydrgen atoms bonded to highly electronegative atoms.

Similarly, structures II and IV are hydrogen bond donors. The C=C double bond is electron withdrawing and highly electronegative making the hydrogen atoms attached to it acidic and hydrogen bond donors. Also, nitrogen is an electronegative atom thereby making structure IV a hydrogen bond donor.

Explanation:

The answer is thermal energy/ kinetic energy.. because friction on hands promotes thermal energy. because you want your hands 2 be warm, rubbing them 2gether creates heat and absorption of heat thru the skin which skin is susceptible to warm, humans can put hands under arm pits to warm hands, without any available heat source..

Answer:

0.0382%

Explanation:

Given that:

Silver chloride = AgCl

Molar mass of AgCl = (107.87 + 35.5) = 143.37 g/mol

Chlorine, Cl = 35.5

143.37g/mol of AgCl = 35.5 g of Cl

Hence, 1 g AgCl will give ; (35.5 / 143.37)

1g AgCl = 0.2476 g Cl

In 0.7715 g AgCl, ; (0.2476*0.7715) g Cl

= 0.1910 g Cl

Therefore, percentage of Cl in 500g sample:

(Mass of Chlorine / mass of sample) * 100%

(0.1910 / 500) * 100%

0.000382 * 100%

= 0.0382%

Answer:

242 cm³.

Explanation:

The following data were obtained from the question:

Initial volume (V₁) = 484 cm³

Initial temperature (T₁) = 570 K

Final temperature (T₂) = 285 K

Pressure = constant

Final volume (V₂) =?

The new volume (i.e final volume) of the balloon can be obtained by using the Charles' law equation as illustrated below:

V₁/T₁ = V₂/T₂

484 / 570 = V₂ / 285

Cross

484 × 285 = 570 × V₂

137940 = 570 × V₂

Divide both side by 570

V₂ = 137940 / 570

V₂ = 242 cm³

Therefore, the new volume of the balloon is 242 cm³

Answer:

All of the elements in group 17 all have 7 valence electrons. This is one thing they all share in common.

Explanation:

well space base stars and I'm done know

Explanation:

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Sometimes making a scale model is not practical because it is expensive and takes a lot time to build up for large models of objects. Rebuilding of destroyed scale models is very difficult.  

A physical model that is geometrically comparable to an item is called a scale model . Scale models may be larger than small prototypes like anatomical structures or subatomic particles, but they are often smaller than huge prototypes like cars, buildings, or people.

Mockups are models created at the same scale as the prototype. In addition to being used as toys, scale models are also utilized as tools for engineering design and testing, marketing, and sales, as well as for military strategy and special effects in movies.

The pursuit of model construction as a pastime for artistic purposes is also common. However, it is very expensive and time consuming to create a scale model.

Find more on scale models:

https://brainly.com/question/19512201

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Explanation:

Valence electrons is the number of electrons in the outermost shell of an atom. For the main group elements, the group number represents the number of valence electrons.

Beryllium

This belongs to the group 2 hence, it has valency of 2.

Nitrogen

This belongs to group 5, hence it has valency of 5.

Oxygen

This belongs to group 6, hence it has valency  of 6.

Fluorine

This belongs to group 7, hence it has valency of 7.

Magnesium

This belongs to group 2, hence it has valency of 2.

Phosphorus

This belongs to group 5, hence it has valency of 5

Sulphur

This belongs to group 6, it has valency of 6

Chlorine

This belongs to group 7, it has valency of 7

Answer:

Beryllium: 2 valence electrons.

Nitrogen: 5 valence electrons.

Oxygen: 6 valence electrons.

Fluorine : 7 valence electrons.

Magnesium : 2 valence electrons.

Phosphorus : 5 valence electrons.

Sulphur : 6 valence electrons.

Chlorine : 7 valence electrons.

A balanced half-reaction :

O₂(g)+ 4H⁺(aq)+ 4e⁻⇒2H₂O(l)

Given

Reduction of gaseous oxygen (O₂) to liquid water(H₂O)

Required

A balanced half-reaction

Solution

Step 1 : Equalize the number of elements by adding coefficients

Equates element O

O₂(g)⇒2H₂O(l)

Step 2 : Equalize H by adding H⁺ on the opposite side (the deficient area of H).

O₂(g)+ 4H⁺(aq)⇒2H₂O(l)

Step 3 : Equalized the charge using the addition of electrons (e⁻) along the H⁺ field.

O₂(g)+ 4H⁺(aq)+ 4e⁻⇒2H₂O(l)

Answer:

Yes.

Explanation:

Yes, I did see a wave that formed and rolled down the line because of tapping the stick on one end of the tape. The wave that had been created goes from one side of the tape to the other end of the tape. This movement occur in the tape due to the disturbance at one end of the tape so we can say that wave formed in the tape and rolled down the line.

Answer:

The temperature of the gas.

Explanation:

According to the kinetic molecular theory, the molecules of a substance are in constant random motion.

If an ideal gas is contained is a sealed rigid container, the average velocity of the gas molecules is dependent of the temperature of the gas.

Recall that temperature is defined as the average kinetic energy of the molecules of a body.

Answer: Energy of reactants = 30, Energy of products = 10

Exothermic

Activation energy for forward reaction is 10.

Explanation:

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.

Energy of reactants = 30

Energy of products = 10

Thus as energy of the product < energy of the reactant, the reaction is exothermic.

Activation energy [tex](E_a)[/tex] is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

[tex]E_a[/tex] for forward reaction is (40-30) = 10.

Answer:

I'd say maybe Dangerous? I hope this helps

Answer:

golden is sometimes referred to as shiny and beatitful

Explanation:

Answer:

C₁₇H₂₀N₄O₆

Explanation:

First, we need to determine the percentage of the atoms in the molecule. Then, assuming a basis of 100 we must convert the mass of each atom to moles. Simplest formula is the simplest ratio of atoms presents in the molecule:

%C:

19.88g CO2 * (12.01g/mol C / 44.01g/mol CO2) = 5.425g C

5.425g C / 10.0g * 100 = 54.25% C

%H:

4.79g H2O * (2*1.01g/mol / 18.015g/mol) = 0.537g H

0.537g H / 10.0g * 100 = 5.37%

%N:

14.89%

%O:

100 - 14.89% - 54.25% - 5.37% = 25.49%

Moles of each atom in a basis of 100g:

C: 54.25g * (1mol / 12.01g) = 4.517moles

H: 5.37g * (1mol / 1.01g) = 5.317 moles

N: 14.89g * (1mol / 14.01g) = 1.063 moles

O: 25.49g * (1mol / 16g) = 1.593 moles

Dividing each amount of moles in the lower number of moles (moles N):

C = 4.517mol / 1.063mol = 4.25

H = 5.317mol / 1.063mol = 5

N = 1.063mol / 1.063mol = 1

O = 1.593mol / 1.063mol = 1.5

This ratio multiplied 4 times to obtain whole-numbers:

C = 4.25*4 = 17

H = 5*4 = 20

N = 1*4 = 4

O = 1.5*4 = 6

The simplest formula for vitamin B6 is:

Explanation:

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Answer:

breaks

Explanation:

I think its braks