1. Write the chemical symbol for each of the following elements.

Aluminum
Beryllium
Calcium
Flourine
Neon
Nitrogen
Silicon
Silfur

2. Write the name of the element for each of the following symbols.

Ar
B
Li
Na
Fe

3. What is the atomic number for the following elements?

C
Fe
Pb
O
N
Zn

Answer:

Thomson--atoms cotain electron

Ernest Rutherford--atoms have a positive nucleus

R.A Millikan--electrons have Q=-1

Dalton--atoms are indivisible

Millikan---> Electrons have a charge of -1

Rutherford ---> Atoms have a positive nucleus

Thomson -----> Atoms contain electrons

Dalton --------> Atoms are indivisible

The atomic theory went through several modifications and different scientists proposed various models of the atom until our present conception of the atom was developed.

The atom was first defined as the smallest indivisible particle of a substance. This idea of "indivisibility" of the atom stems from Dalton's theory.

The fact that atoms were composed of negatively charged electrons was proven by the experiments of J.J Thompson using the cathode ray tube. Millikan's charge to mass experiment showed that the electron has a charge of -1.

Rutherford, in his famous gold foil experiment showed that atoms were composed of a positively charged nucleus.

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Answer:

gold i believe or possibly bromine

Explanation:

q- how does fluorine react with gold

a- this fluoride compound features gold in its highest known oxidation state. this red solid dissolves in hydrogen fluoride, but these solutions decompose, liberating fluorine.

q- how does chlorine react with gold

a- gold does react with halogens. it'll, for example, react very slowly with chlorine gas at room temperature to form gold chloride, AuCl3. if gold chloride is heated gently, it will decompose to release the pure elements again.

q- how does bromine react with gold

a- gold in bromine solutions dissolves according to electrochemical/chemical (EC) mechanisms. ... in the chemical composition of the mechanism, this monovalent gold bromide disproportionate into gold and stable AuBr −4 , which reports into solution. with respect to pH, there are two characteristic dissolution regions.

** sorry that i can't provide a sure answer**

good luck :)

i hope this helps

have a nice day!

Fluorine will be most reactive with gold.

What is fluorine?

Of almost all of the elements, fluorine seems to be the most electronegative as well as reactive. Fluorine would be a diatomic, pale yellow, extremely corrosive, combustible gas with a strong smell. The lightest halogen would that be. It produces oxygen and even the incredibly corrosive hydrofluoric acid when it combines strongly with water.

Reactivity would be a substance's capacity to chemically combine with several other substances. Iron, for instance, reacts vigorously with oxygen.

As you move down the group, the halogens, which are non-metal elements in Group 7, become less reactive. In contrast to the alkali metals within Group 1 of the particular periodic table, this trend is the opposite. One of the most reactive elements in Group 7 was fluorine.

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Answer: cross-pollination

Explanation:

Answer:

sadr

Explanation:

Pls give brainlist

Answer:

you multiply it by the other subscripts in the parenthesis.

Explanation:

Answer:

they are both equal

Explanation:

if you don't know don't guess troll the teacher you will get it wrong anyway

Answer:

Explanation:

in the decomposition of gallium chlorate, 75.0grams is heated to produce oxygen and gallium chloride.

Answer:

If they mean the type of animal in the first question, they are both foxes.

They have different fur colors and are in different location/habitats

Yes, they are the same animal because they have almost the same features; Their fur color is different so they can blend better into the environment around it.

Explanation:

I hope this helps

Answer:

c

Explanation:

h

Answer: If a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

Explanation:

According to the standard conversion,

[tex]1 Joule = 0.000239006 kcal[/tex]

Therefore, 675,000 Joules will be converted into kcal as follows.

[tex]1 Joule = 0.000239006 kcal\\675,000 J = 675000 J \times \frac{0.000239006 kcal}{1 J}\\= 161.328872 kcal[/tex]

Thus, we can conclude that if a reaction releases 675,000 Joules then it means it releases 161.328872 kcal.

Answer:

B and D

Explanation:

Bc it has more fat than the other

Answer:

1. 9600 moles

2. 4096 moles

Explanation:

CS2 + 3 O2=> CO2 + 2 SO2

1. The ratio for CS2: SO2 is :

1:2

If there are 75g of CS2 then there are:

75 × 2= 150g of SO2

Moles = mass × Mr

Moles = 150 × 64

Moles = 9600

2. The ratio for O2 : SO2 is:

3:2

If there are 96g of O2 then there are:

96 × 2/3 = 64g of SO2

moles = mass × Mr

Moles = 64 × 64

Moles = 4096

Answer:  The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.

Explanation:

Answer:

C.164.1g/mol

Explanation:

40+14×2+16×6

164

The molar mass of Ca(NO3)2 is 164.1 g/mol.

Calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is an inorganic compound with the formula Ca(NO3)2(H2O)x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Calcium nitrate is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.

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Answer:

Mecury almagamated zinc

Answer: The forces of attraction are stronger in new attractions that are formed.

Explanation:

When a chemical reaction takes place between two or more different compounds then less reactive substance is displaced by the more reactive substance.

During this process, when bonds are broken between the reactants then it means the force of attraction is less stronger. The formation of new compounds occur because force of attraction is more in these new substances due to which its atoms come closer to each other.

Thus, we can conclude that forces of attraction are stronger in new attractions that are formed.

Answer:

64852.94 N/m²

Explanation:

From the question,

P = F/A.................... Equation 1

Where P = Pressure of the Elephant on the ground, F = Weight of the Elephant, A = Area of the sole of the four legs.

But,

F = mg.............. Equation 2

Where m = mass of the elephant, g = acceleration due to gravity

Substitute equation 2 into equation 1

P = mg/A............ Equation 3

Given: m = 4500 kg, A = (1700×4) cm² ( The elephant has four legs) = 6800 cm² = 0.68 m²

Constant; g = 9.8 m/s²

Substitute these values into equation 3

P = (4500×9.8)/0.68

P = 64852.94 N/m²

The gold is not the compound.

The information related to the compound is as follows

Therefore we can say that gold is not the compound.

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Answer:

-96.6°C

Explanation:

Given:

        mass CCl4 = 530.0 g * (1 kg / 1000)

        mass CCl4 = 0.5300 kg

First calculate the molality (m) of the solute, which is the moles of solute divided by the kg of solvent ([tex]\frac{moles}{kg}[/tex]):

molality CHCl3 = (mass moles CHCl3) / (mass CCl4 in kg)

molality CHCl3 = (1.31 mol) / (0.5300 kg)

molality CHCl3 = 2.471698m

Decrease in freezing point of solvent = (Kf) * (molality of solute)

Decrease in freezing point of CCl4 = (Kf) * (molality CHCl3)

Decrease in freezing point of CCl4 = (29.8°C/m) * (2.47m)

Decrease in freezing point of CCl4 = 73.6566°C

Then use the molality of the solute to calculate the change in freezing point and subtract the change from the original freezing point.

Freezing point of solution =

(freezing point of pure solvent) - (Decrease in freezing point)

Freezing point of solution = (-22.9°C) - (73.66°C)

Freezing point of solution = -96.6°C

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Answer:

Option B. It is a basic solution.

Explanation:

To know which option is correct, let us calculate the pH of the solution.

First, we shall determine the pOH of the solution. This is illustrated below:

Concentration of Hydroxide ion, [OH¯] = 3.5×10¯⁶

pOH =.?

pOH = –Log [OH¯]

pOH = –Log 3.5×10¯⁶

pOH = 5.5

Finally, we shall determine the pH. This can be obtained as follow:

pOH = 5.5

pH =?

pH + pOH = 14

pH + 5.5 = 14

Collect like terms

pH = 14 – 5.5

pH = 8.5

The pH scale reads as follow:

0 to 6 => Acidic

7 => Neutral

8 to 14 => Basic

Comparing the pH of the solution (i.e 8.5) with the pH scale, we can conclude that the solution is basic because the pH of solution lies between 8 and 14.

Answer:

no sure

Explanation:

This is a Charles' Law problem: V1/T1 = V2/T2. As the temperature of a fixed mass of gas decreases at a constant pressure, the volume of the gas should also decrease proportionally. Here, we are given the new volume of the gas after cooling, and we want to determine to what temperature the gas was cooled.

To use Charles' Law, the temperature must be in Kelvin (x °C = x + 273.15 K). We want to solve Charles' Law for T2, which we can obtain by rearranging the equation into T2 = V2T1/V1. Given V1 = 130 L, T1 = 250 °C (523.15 K), and V2 = 85 L:

T2 = (85 L)(523.15 K)/(130 L) = 342 K or 68.9 °C. If sig figs are to be considered, since all the values in the question are given to two sig figs, the answer to two sig figs would be either 340 K or 69 °C.  

Gases show great uniformity in their behaviour irrespective of their nature. The concept Charles's law is used here to determine the new temperature of the gas. The new temperature of the gas is 341.96 K.

At constant pressure, the volume of a given mass of gas is directly proportional to the temperature on Kelvin scale. The absolute scale of temperature is introduced by the scientist Charles. The temperature at which gases supposed to have zero volume is called the absolute temperature.

Mathematically the Charles's law can be expressed as:

V = constant × T

V / T = constant

For two different gases, the equation is:

V₁ / T₁ = V₂ / T₂

T₂ = V₂T₁ / V₁

85 × 523 / 130 = 341.96 K

Thus the new temperature of the gas is 341.96 K.

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Answer:

C, hexanal

Explanation:

Option C is correct. The given name of the aldehyde CH3CH2CH2CH2CH2CHO is Hexanal

Aldehydes are organic compounds formed from the oxidation of alcohols. The contains the group -CHO

Given the compound CH3CH2CH2CH2CH2CHO

For us to name this compound, we need to first know:

Since there are 6 carbons in the chain, hence the alkane equivalent will be hexane.

Since it is an aldehyde compound.

General naming = alkane name + group name of aldehyde

compound name = alkane name + (-nal)

compound name = hexanal

Hence the name of the given aldehyde is Hexanal

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Answer:

c

Explanation:

When you heat something, you add energy to it. This causes the particles to move faster and farther apart. Heating solids turns them into liquids. Turning a solid into a liquid is called melting. Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties.

Answer:

Explanation:

When you use electricity to charge your car, you can integrate renewable resources like solar into the fueling process. Without solar, your electric vehicle is still effectively running off of fossil fuels – it's just the fossil fuels utilized at the power plant and not within your engine.

Fossil fuels include substances like natural gas, coal, and oil. It is possible for electric cars to run on these fossil fuels. Fossil fuels like coal are burnt up to generate electricity. So when cars run on electricity, they are indirectly tapping into fossil fuels.

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Answer:

10km

Explanation:

Answer:

[tex]\boxed {\boxed {\sf 10 \ kilometers}}[/tex]

Explanation:

Distance is the product of speed and time.

[tex]d=s \times t[/tex]

The speed of the ship is 5 kilometers per hour. The time is 2 hours.

Substitute the values into the formula.

[tex]d= 5 \ km/hr * 2 \ hr[/tex]

Multiply. Note that the hours will cancel each other out.

[tex]d= 5 \ km * 2 \\d=10 \ km[/tex]

The ship covers a distance of 10 kilometers.

Statement which is true about ethane and water is that water is likely to have a higher boiling point because it has fewer atoms per molecule.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

C

Explanation:

The weeds will be replaced by woody shrubs and some small trees.

If the forest land is cleared, it is hard to construct a forest again. The cleared land will grow as grass land then if there is no constructions or buildings fills the land. Hence, option B is correct.

Forestation is the process of formation of forests and dense growth of trees and other kinds of plants. Forests are example of ecosystems and  wide variety of plant species and animals are living there.

Nowadays, deforestation is common for the selfish purposes of man to buildups their own amenities so that, many more plants and animals are on the edge of extinction.

There are naturally made forests as well as man made forests.  It was results of hard working that to form a forest with all its atmosphere and biodiversity will take longer time. It will not happen within just five years.

Thus,  if the forest land is cleared, the empty ground may fill with grasses and flower plants. Hence option B is correct.

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Answer:

Yes you are correct

Explanation:

But the spelling is black amu