Can someone please help me I really need help

Answer:

0.17 ( 2 s.f.)

Explanation:

d=m/v

=6/35

=0.1714285

=0.17

Answer:

Hey bro

Explanation:

I don't like boys and the answer most definitely is 69

Answer:

atomicity of water is 3

Explanation:

Answer:

please mark brainliest!

Explanation:

one molecule of water contains two atoms of hydrogen and one atom of oxygen, the atomicity of water is three.

Answer:

Ba(OH)2 is a strong base, so it conducts electricity well

Explanation:

The dissociation of a strong electrolyte is apparent by its reaction arrow, which only points toward products. In contrast, the reaction arrow of weak electrolytes points in both directions. The general form of the strong electrolyte equation is: Strong acids, strong bases, and ionic salts that are not weak acids or bases are strong electrolytes.

X     NH3 is a weak base

X     C12H22011 is neutral (not an acid or a base), therefore it a nonelectrolyte

X     CH3COOH is a weak acid and it also dissociates partially.

The substance which is a strong electrolyte is Ba(OH)₂.

Hence Option (B) is correct answer.

Strong electrolyte can be defined as the substance that completely dissociates in to ions.

Strong electrolyte (aq) → cation⁺ (aq) + anion⁻ (aq)

Now lets check all options one by one

Option (A): NH₃

NH₃ is a weak base. NH₃ does not completely ionize so it is a weak electrolyte.

Hence it is incorrect option.

Option (B): Ba(OH)₂

Ba(OH)₂ is a strong electrolyte because it dissociates completely in water.

Ba(OH)₂ (aq) → Ba⁺² (aq) + 2OH⁻ (aq)

Hence, it is correct option.

Option (C): C₁₂H₂₂O₁₁

C₁₂H₂₂O₁₁ is a non electrolyte that means it does not dissociate into ions.

Hence, it is incorrect option.

Option (D): CH₃COOH

CH₃COOH is a weak electrolyte due to the presence of lowest number of ions it does not dissociate. It's ionization is very less.

Hence, it is incorrect option.

Thus, from the above conclusion we can say that The substance which is a strong electrolyte is Ba(OH)₂.

Hence Option (B) is correct answer.

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Answer:

Option B = 60,600 mg  (correct option)

Explanation:

First of all we will have an idea which numbers are consider as significant.

1 = All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

2= Leading zeros are not consider as a significant figures. e.g. 0.02 in this number only one significant figure present which is 2.

3= Zero between the non zero digits are consider significant like 105 consist of three significant figures.

4= The zeros at the right side e.g 3400 are also significant. There are four significant figures are present.

In given options, Option A 60.6 mg have 3 significant figures.

Option B have 5 significant figures.

Option C have 4 significant figures.

Option D have 3 significant figures.

Thus option b is correct option which have more significant figures.

Answer:

C

Explanation:

Answer:

c.metal

Explanation: metal is able to carry heat

Answer:

Option A

Explanation:

To know the correct answer to the question, let us write an equation illustrating the formation of MgBr₂.

This is illustrated below:

1. Magnesium (Mg) is divalent element hence it will lose 2 electrons to form magnesium ion (Mg²⁺) as shown below

Mg —> Mg²⁺ + 2e¯

2. Bromine (Br) is a univalent element. Two bromine atom will receive the two electrons (i.e each atom receives 1 electron) to form the bromide ion (Br¯) as shown below:

2Br + 2e¯ —> 2Br¯

Combine both equation

Mg + 2Br + 2e¯—> Mg²⁺ + 2e¯ + 2Br¯

Cancel out 2e¯

Mg + 2Br —> Mg²⁺ + 2Br¯

Thus we have

Br—Mg—Br

From the illustration made above, we can see that two bromine atom is receiving 1 electron each from the magnesium atom

Answer:

9.11 x 10 -28 grams

Explanation:

Answer:

with a double line

Answer with Explanation:

A "suspension" is said to be unstable because some of its particles settle at the bottom when it is left for some time. One example of this is the "antibiotic suspension." If you might have noticed, the particles settle at the bottom and this is the reason why it is important to shake the medicine before giving it to patients. Another point to consider is the fact that the suspension has a residue when you try to filter out the particles. This means the solute can be separated from the solvent; thus, it cannot be distributed uniformly. So, this makes it unstable.

Explanation:

Osmosis helps maintain homeostasis by maintaining concentration of solvents and solutes constant inside cells.

Answer:

Nitrogen has 7 protons, 7 neutrons, and 7 electrons.

So, I'm not entirely sure about the choices you provided :)

Answer:

harder

Explanation:

Answer:

The increased distance weakens the nuclear attraction to the outer-most electron, and is easier to remove

Explanation:

Answer:

[He] 2s² 2p⁴

Explanation:

If you're looking for the answer in subshell form, here it is:

[tex]1sx^{2} 2sx^{2} px^{4} (2.6)[/tex]

Quote:

"Where I walk, I walk alone. Where I fight, I fight alone."

- Akuma

Answer:

Diagram of the nuclear composition and electron configuration of an atom of barium-138 (atomic number: 56), the most common isotope of this element. The nucleus consists of 56 protons (red) and 82 neutrons (blue).

The question is incomplete; the complete question is:

Recall all the atomic models you described in task 1. think about the results...

Recall all the atomic models you described in task 1. think about the results each model would predict for rutherford’s gold foil experiment. which atomic models does rutherford’s experimental evidence support? explain why these models are compatible with the experimental results.

the models in task 1 were dalton's, thomson's, rutherford's, and bohr's.

Answer:

Bohr's

Explanation:

Rutherford's theory laid the foundation upon which Bohr's model is founded. Rutherford established the fact that at the center of the atom, there is a nucleus whose radius is smaller than the radius of the atom. This nucleus is positively charged and most of the mass of the atom is concentrated there. Electrons move round this nucleus in orbits.

The experimental evidences of the Bohr's model shows that Rutherford's model was fundamentally correct. However, Bohr's model introduced the idea of quantization of the energy of electrons in an atom. The model went further to explain the spectra lines of the hydrogen atom.

Answer:

The answer is 1

Explanation:

Gold is gold, the size doesn't change what it is.

Answer:

E

Explanation:

Predict the effect of a mutation which limits the production of pigment in hair

The animal would have white hair or hair with no color.

The animal would have light brown hair.

The animal would have black hair.

The animal would have no hair at all.

The animal would have white hair or hair with no color is the effect of a mutation which limits the production of pigment in hair.

Hence, the animal would have white hair or hair with no color is the correct option.

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Answer:

I think that a  pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.

Explanation:

Answer:

0.067 ton/Litre.

Explanation:

645 Newtons per quart to tons per liter.

We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:

1 N/q = 100 g/q

Therefore,

645 N/q = 645 N/q × 100 g/q / 1 N/q

645 N/q = 64500 g/q

Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.

Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:

454 g/q = 1 pound/q

Therefore,

64500 g/q = 64500 g/q × 1 p/q / 454 g/p

64500 gram/quart = 142.07 pound/quart

Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.

Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:

2000 p/q = 1 ton/q

Therefore,

142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q

142.07 pound/quart = 0.071 ton/quart

Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.

Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:

1 ton/q = 1/1.06 ton/L

Therefore,

0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q

0.071 ton/quart = 0.067 ton/Litre

Therefore, 0.071 ton/quart is 0.067 ton/Litre.

From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.

Answer:

color (intensive)

density (intensive)

volume (extensive)

mass (extensive)

boiling point (intensive): the temperature at which a substance boils.

melting point (intensive): the temperature at which a substance melts.

Answer:

independent variable - the thing you change

dependent variable - the thing you measure

control variables - the things you keep the same

Answer:

answer: B

Explanation:

becaucse it is B

A bond between a nonmetal and a nonmetal is called a covalent bond. The correct answer is option C.

Covalent bonding occurs when two nonmetal atoms share one or more pairs of electrons in order to achieve a stable electron configuration.

This type of bond is characterized by the sharing of electrons between the atoms, rather than the transfer of electrons as in ionic bonding.

An example of a covalent bond between two nonmetals: The bond between two oxygen atoms in an [tex]\rm O_2[/tex] molecule. In this molecule, the two oxygen atoms share two pairs of electrons to form a stable covalent bond.

Therefore, option C. Covalent bond is a bond between a nonmetal and a nonmetal.

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Answer:

When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons. In the opposite case when an atom gains electron(s) it becomes negatively charged (more electrons than protons).

Explanation:

Option A, median is the correct answer

Answer:

The study population is the subset of the target population available for study (e.g. schizophrenics in the researcher's town). The study sample is the sample chosen from the study population.

Explanation:

In research terminology the Population can be explain as a comprehensive group of individuals, institutions, objects and so forth with have a common characteristics that are the interest of a researcher. Any value which is identified or measured from the characteristics of entire population can be called as Parameter.

Answer:

C is correct

Explanation:

the person above me is also correct hope this helps

The key difference between Dmitri Mendeleev and Henry Moseley's periodic table arrangements lies in the fundamental basis of their organization: C) Moseley arranged the elements based on atomic numbers while Mendeleev arranged the elements based on atomic masses.

Dmitri Mendeleev (1869): Mendeleev's periodic table was the first successful attempt at organizing the elements. He arranged the elements in order of increasing atomic masses and grouped them based on their chemical properties. Mendeleev's periodic table also left gaps for elements that were yet to be discovered, predicting their properties based on the trends of the known elements.

Henry Moseley (1913): Moseley's contribution to the periodic table was the realization that the atomic number (number of protons in the nucleus of an atom) was a more fundamental property than atomic mass. Moseley proposed that the periodic table should be arranged based on increasing atomic numbers rather than atomic masses. This arrangement resulted in a more accurate and systematic organization of the elements.

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