What is the control in the experiment?

Answer:

Hypothesis

Explanation:A hypothesis is what gives the user the directions of the lab and what needs to be done for the procedure

Explanation:

I think it is d because it is a gas

Answer:

A reaction in which heat is absorbed by reactant molecules and energy of products become more than reactants is known as an endothermic reaction

Answer:

1.false

2.neutron

3.neutron

Answer:

1. false

2. zero

3. isotopes

hope it helps

Answer:

D

Explanation:

Atomic mass is the total mass of protons, neutrons and electrons of an atom at rest

Lets find

[tex]\\ \sf\longmapsto H_2SO_4[/tex]

[tex]\\ \sf\longmapsto 2(1u)+32u+4(16u)[/tex]

[tex]\\ \sf\longmapsto 2u+32u+64u[/tex]

[tex]\\ \sf\longmapsto 34u+64u[/tex]

[tex]\\ \sf\longmapsto 98u[/tex]

Answer:

1, just I) color.

Physical properties are the properties that can be observed without changing the composition of a substance, such as color, temperature, density, and boiling point.

A physical change is a change in the substance that only modifies its aggregation state, such as solidification, and boiling.

Chemical properties are the properties that need a reaction to being observed, such as combustibility, which needs a combustion reaction to being quantified.

When a chemical reaction occurs, and the composition of the substance change, it's a chemical change.

So, heating copper with carbon is a chemical reaction, and purification by electrolysis is too. Color is the only physical property.

C. Chemical properties always change depending on temperature or pressure.

Physical Change v/s Chemical Change:

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Answer:

Image result for Polar molecules have partial positive and partial negative charges. An electrical attraction between the partial positive charge of one polar molecule and the partial negative charge of another polar molecule is called a/an

A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other.

Explanation:

Answer:

D) sodium chloride

i think this is the answer

Explanation:

The correct answer to the question is Rubidium (Rb)

Rubidium (Rb) is a group 1 element and as such, it can form bond by losing it's valence electron (i.e 1 electron) easily.

Gallium (Ga) is a group 13 element. It can only form bond by losing it's 3 valence electrons.

Argon is a group 18 element. This group has completely filled outermost shell and are very stable. They do not involve in bond formation.

Iodine (I) is a group 17 element. It is more difficult for this group to lose its 7 valence electrons hence, they form bond by accepting 1 electron.

With the above information, we can conclude that Rubidium will most likely lose electron to form bond.

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Answer:

(Question 1)Which element would most likely lose electrons to form positive ions when bonding with other elements?

(Answer) rubidium (Rb)

(Question 2) Which statement about sodium chloride is correct?

(Answer) The sodium atom transfers electrons to the chlorine atoms to form ionic bonds.

(Question 3) Based on their locations in the periodic table, which two elements are most likely to form covalent bonds with each other?

(Answer) nitrogen (N) and oxygen (O)

(Question 4) Which phrase best describes electronegativity?

(Answer) the relative strength with which an element attracts electrons in a chemical bond

(Question 5) Based on the information in the table, which pair of elements would likely form the least polar bonds with each other?

(Answer) bromine and nitrogen

Explanation:

just finished the quick check enjoy UwU

Answer:

Option 2 variable

Explanation:

Answer:

variable.

Explanation:

A variable is anything that can change or be changed. In other words, it is any factor that can be manipulated, controlled for, or measured in an experiment.

Answer:

3.8775 kJ

Explanation:

The formula is Q=mcdeltat

We know m (mass) is 150, c (specific heat) is 0.235, and delta t (change in temperature) is 135-25=110

Plug that in and solve for Q

150*0.235*110=3877.5 J

The problem is that this is still in joules so we have to convert to kilojoules

3877.5 J * 1 kJ/1000 J = 3.8775 kJ

Answer:

Hydrogen finds a variety of application due to its dual nature. Following are some important uses of hydrogen:

Hydrogen is used in the synthesis of ammonia and the manufacture of nitrogenous fertilizers.

Hydrogenation of unsaturated vegetable oils for manufacturing vanaspati fat.

It is used in the manufacture of many organic compounds, for example, methanol.

Hydrogen chloride is a very useful chemical and is prepared from hydrogen.

Hydrogen can reduce many metal oxides to metals by metallurgical processes.

Hydrogen is used as rocket fuel in many space research activities.

Hydrogen fuel is being experimented within the automotive industry with hydrogen fuel cells.

Answer:

B

Carboxylic acid

Explanation:

I'm not entirely sure, but this should be it

Answer:

(a).

[tex]{ \sf{1000 \: {cm}^{3} \: contains \: 0.2 \: moles \: of \: acid}} \\ { \sf{25 \: {cm}^{3} \: contains \: ( \frac{25 \times 0.2}{1000} ) \: moles}} \\ \\ = { \sf{0.005 \: moles}}[/tex]

» 0.005 moles of sulphuric acid are present.

(b).

from the equation:

[ 1 mole of acid reacts with 2 moles of sodium hydroxide ]

[tex]{ \sf{1 \: mole \: of \: acid \: reacts \: with \: 2 \: moles \: of \: hydroxide}} \\ { \sf{0.005 \: moles \: of \: acid \: react \: with \: (0.005 \times 2) \: moles}} \\ { \sf{ = 0.01 \: moles}}[/tex]

» 0.01 moles of sodium hydroxide reacted.

(c).

[tex]{ \sf{10 \: {cm}^{3} \: contains \: 0.01 \: moles \: of \: hydroxide }} \\ { \sf{1000 \: {cm}^{ 3} \: contain \: ( \frac{1000 \times 0.01}{10} ) \: moles}} \\ \\ { \sf{ = 1 \: mol \: {l}^{ - 1} }}[/tex]

» concentration is 1 M

Answer:

4.  0.5 kilometers (1st option)

5.  0.1 00 liters (last option)

Explanation:

500 meters to kilometers

4.

1 kilometer = 1000 meters

We use the formula SBD (SMALL TO BIG DIVIDE) i hope this helps you

500 ÷ 1000

= 0.5 kilometers

5.

100 milliliter to liter

SBD

100 ÷ 1000

= 0.1 00 liters

Answer:

protons

Explanation:

btw you protons and electrons are always the same

prcAnswer:

e c. proton

Explanation:

i pueslist

Answer:

Atoms are neutral; they contain the same

samenumber of protons as electrons. By

definition, an ion is an electrically charged

particle produced by either removing

produced by either removingelectrons from a neutral atom to give a

produced by either removingelectrons from a neutral atom to give apositive ion or adding electrons to a neutral atom to give a negative ion.

Sodium can be used to solve the problem of

Sodium polyacrylate is a sodium salt of polyacrylic acid. It is a super absorbent polymer (SAP) that has great adsorption abilities enabled by the presence of sodium. These abilities find great application in many consumer products as it solves a lot of problems.

Metal ions can be removed from water in industries and water bodies using sodium polyacrylate because it has the ability to increase the surface area of porous substances so that there can be more transfer of mass.

Summarily, the problem of metal ions in water which causes pollution can be solved using GUK.

Learn more about sodium polyacrylate here:

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Answer:

0.0074 moles

Explanation:

We'll have to use this forumla: PV = nRT

P = Pressure (0.724)

V = Volume in liters (0.25)

n = moles

R = 0.0821

T = temperature in kelvins (25 + 273 = 298)

Our equation will look like this:

(0.724)(.25) = n(0.0821)(298)

0.181 = 24.4658n

Divide both sides by 24.4658 to isolate n

0.181/24.4658 = 24.4658n/24.4658

n = 0.00739808

Answer:

[tex]\boxed {\boxed {\sf 4 \ g/cm^3}}[/tex]

Explanation:

We are asked to find the density of a brick. Density is a substance's mass per unit volume. The formula for calculating density is as follows.

[tex]\rho= \frac{m}{v}[/tex]

The mass of the brick is 100 grams and the volume is 25 cubic centimeters.

Substitute the values into the formula.

[tex]\rho= \frac{ 100 \ g}{25 \ cm^3}[/tex]

Divide.

[tex]\rho=4 \ g/cm^3[/tex]

The density of the brick is 4 grams per cubic centimeter.

Answer:

The radius of a calcium atom would be larger than that of a magnesium atom.

The radius of a calcium atom would be slightly smaller than that of a potassium atom.

Explanation:

Refer to a modern copy of the periodic table.

Calcium and magnesium are in the same column. They are in the same group (IUPAC group [tex]2[/tex].)

Hence, atoms of calcium and magnesium would have similar effective nuclear charges. In other words, the attraction between a calcium atom nucleus and its valence electrons would be similar to that of magnesium.

However, calcium is in the fourth row of the periodic table (fourth period) while magnesium is in the third (third period.) A calcium atom would thus have four main shells with electrons. In contrast, a magnesium atom would only have three such main shells.

Despite the similar effective nuclear charge (effective attraction on the outermost electrons,) the radius of a calcium atom would be larger than that of a magnesium atom because of the extra main electron shell.

On the other hand, calcium and potassium are in the same row (same period.) A calcium atom and a potassium atom would both include four electron-filled main shells.

However, with one additional proton per atom, the effective nuclear charge of calcium atoms would be greater than that of potassium atoms. Hence, when compared to potassium nuclei, the nucleus of a calcium atom would pull its electron shells closer to the center. The radius of a calcium atom would thus be smaller than that of a potassium atom.

In general, atomic radius would generally become larger when moving down a column in the periodic table. On the other hand, atomic radius would general become smaller when moving towards the right-hand side of a row in the periodic table.

Answer:

Lack of oxygen can cripple the oysters' ability to fight off the parasite Perkinsus marinus that causes Dermo and slowly takes over their bodies.

Answer:

[tex]oxygen \: at \: 94.1\% \: hydrogen \: at \: 5.9\% \\ at \: 100gram \: oxygen \: \\ \: 94.1\% = .941 \times 100g \\ = 94.1 \times \frac{1mol}{16g} = 5.88g \\ hydrogen \: \\ 5.9\% = .059 \times 100 = 5.9 \times \frac{1mol}{1.002g} = 5.88g \\ here \: oxygen = hydrogen \: so \: ratio \\ = 1 \: \: \: 1 \: \\ emperical \: formula \: = oh\\ thank \: you[/tex]

Composition:

5.9% Hydrogen and 94.1% Oxygen (by mass)

in a 100 gram sample:

5.9 gram Hydrogen

94.1 gram Oxygen

Finding the number of moles:

Moles of Hydrogen:

moles = given mass/ molar mass

moles = 5.9 / 1          [molar mass of Hydrogen = 1g/mol]

moles of hydrogen = 5.9 moles

Moles of Oxygen:

number of moles = given mass / molar mass

number of moles  = 94.1 / 16          [molar mass of Oxygen = 16g/mol]

moles of Oxygen = 5.88 ≈ 5.9 moles

Empirical Formula:

Moles of Hydrogen : Moles of Oxygen

5.9 : 5.9

Moles of Hydrogen : Moles of Oxygen = 1:1

Empirical Formula = OH

Answer:

hello ~~

look nucleus is mixture of neutrons and protons.. right?

and we know neutrons have no charge and protons are positively charged so overall charge of nucleus is positive

Answer:

Experience in star is very nice

Explanation:

Because i love stars