Which would balance the equation? (Look at picture on my laptop)

-3
-4
-1
-2

Answer:

D

Explanation: An exothermic change is Because it has heat.

Answer:

C

Explanation:

Interference trust me I just did this

A light wave bends to pass through a crack underneath a door, this represents interference. The correct option is option C.

Like other waves, light waves also transfer energy to a source. They are made up of tiny energy particles known as photons. While photons have no mass, they do have momentum and energy.

There are types of light waves which human eyes cannot perceive, just as there are noises that can't be recognized because they fall outside the range of human hearing. However, all forms of waves share characteristics like wavelength and frequency. Wavelength is the separation between neighboring wave components (e.g., crest to crest or trough to trough). A light wave bends to pass through a crack underneath a door, this represents interference.

Therefore, the correct option is option C.

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Answer:

A.phase of moon

I hope it helps you

Answer:

Diagram B is a mixture of compounds

Explanation:

The false statement about any of the diagram is that diagram B is a mixture of compounds.

Diagram is not a mixture of compounds. It is a single compound in gaseous state .

Answer:

120C°

Explanation:

Answer:

D. 10 individuals emigrate, 4 individuals die, 14 individuals immigrate, 0 individuals are born

Explanation:

         hi!

Answer:

Air pressure is what you measure with a tire gauge. Atmospheric pressure is what you measure with a mercury barometer. ... Pressure is the amount of force per unit area that a gas exerts on a surface

Explanation:

none

Answer:

Explanation: Every electron has a single negative(-) charge, the addition of two electrons results in an oxygen ion with a charge of negative(−)2. This is  in fact true of every element located under oxygen in the periodic table.

P.S. hope this helps :)

Answer:

six

Explanation:

Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.

Answer:

Six!

Explanation:

Valence electrons are the electrons in the outermost shell of an atom.

Answer:

preservation of raw materials

Explanation:

Reusing and recycling is the process by which the used products are used again or recycled in different form to use it again. Excessive use of the raw materials can lead to their extinction. Recycling the materials helps in decreasing the pollution in the environment. It also helps in reduction in the emission of the harmful gases. When municipal wastes are reused or recycled, the raw materials are preserved. These are the process involved in sustainable use of resources.

Answer:

Explanation:

The nucleus of an atom contains neutrons and protons bonded tightly together. The same chemical element can have a different number of neutrons and still be the same element.

Answer:

c

Explanation:

Answer:

C. The experiment shows that the red substance experienced a chemical change.

Answer:

The orbit of the earth is a ellipse.   Yes.  Yes

Explanation:

Answer:

Direct

Explanation:

Edge

When the temperature increases with an increase in pressure, it is a direct relationship.

Gay-Lussac's law can be described as when the volume of the gas remains constant then the pressure of a gas is directly proportional to the absolute temperature of the gas.

The mathematical equation of Gay Lussca's law is written as follows:

P/T = k

It can be represented as the pressure is directly proportional to the absolute temperature.

P ∝ T               (where 'V' volume of gas is constant)

or

[tex]\frac{P_1}{T_1} =\frac{P_2}{T_2}[/tex]

Where P₁ and T₁ are the initial temperature and pressure while P₂ and T₂ are the final pressure and temperature of the gas.

The sample of gas has a fixed volume of gas and on increasing the temperature the gas molecules acquire more and more kinetic energy. So the pressure of the gas will also increase.

Therefore, there will be a direct relationship between temperature and pressure of gas.

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Answer:

B. particles in an object move faster

Explanation:

At higher temperatures, particles in an object moves faster.

Temperature is the degree of hotness or coldness of a body.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{8.50 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 14.119601...[/tex]

We have the final answer as

Hope this helps you

Answer:

i belive its c i could be wrong but theres my input

Answer:

The water supply is not safe.

Explanation:

Ionically, the reaction is;

Pb^2+(aq) + 2Br^-(aq) -------> PbBr2(s)

Amount of Br^- reacted = 2/1000 * 0.12 = 2.4 * 10^-4 moles

From the reaction equation;

1 mole of Pb^2+ requires 2 moles of Br^- for complete precipitation

x moles of Pb^2+ requires 2.4 * 10^-4 moles of Br^-

x = 1 * 2.4 * 10^-4 /2

x = 1.2 * 10^-4 moles of Pb^2+

Concentration of Pb^2+ precipitated from 5ml of tap water =  1.2 * 10^-4 * 1000/5

Concentration = 2.4 * 10^-2 M

The amount of  Pb^2+ found in the water is greater than the maximum allowable concentration of Pb2+ ions in water in a local community which is 1.51 x 10-8 M. Therefore, the water supply is not safe.

The balanced equation :

2KOH+CO₂⇒K₂CO₃+H₂O

Equalization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:

1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.

2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product

3. Select the coefficient of the substance with the most complex chemical formula equal to 1

Reaction

KOH+CO₂⇒K₂CO₃+H₂O

aKOH+bCO₂⇒K₂CO₃+cH₂O

K, left=a, right=2⇒a=2

H, left=a, right=2c⇒a=2c⇒2=2c⇒c=1

O, left=a+2b, right=3+c⇒a+2b=3+c⇒2+2b=3+1⇒2b=2⇒b=1

the equation becomes :

2KOH+CO₂⇒K₂CO₃+H₂O

Answer:

Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. ... The magnetic force between two moving charges may be described as the effect exerted upon either charge by a magnetic field created by the other.

Explanation:

brainlest pls

[tex] \huge \boxed{\mathbb{QUESTION} \downarrow}[/tex]

[tex] \huge \boxed{\mathfrak{Answer} \downarrow}[/tex]

Answer:

12 B

13

0.00100176

Explanation:

Answer:

True

Explanation:

Answer:

A a compound because its parts cannot be separated through physical means.

Explanation:

The sugar is a compound because its parts cannot be separated through physical means.

A compound is a substance composed of two or more kinds of atoms joined together in a definite grouping.

The properties of a compound are distinct from those of the elements that makes them up.

I don’t know

but thank u for the points

I need points hehe

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Answer:

0.272 mol AgOH

Explanation:

Figure out the amount of AgOH in mass, and to find the amount of moles–you just divide the given amount (34g) by the molar mass of AgOH (125g) to figure out the amount of moles. 34/125 = 0.272 mol AgOH.