(1) In an experiment for determining the density of water, the following results
were recorded.
-mass of an empty beaker = 65gm.
- mass of the beaker and water = 165gm.
the volume of water = 100Cm.
(Calculate the density of water)​

Answer:

An electromagnet is a coil of wire wrapped around a bar of iron or other ferromagnetic material. When electric current flows through the wire, it causes the coil and iron bar to become magnetized. An electromagnet has north and south magnetic poles and a magnetic field.

Explanation:

The three main components of an electromagnet are the iron core, copper wire, and an electricity source.

An electromagnet is a magnet in which a coiled or wrapped wire is given electricity. When Current is given to this wire, it acts like a magnet. An electromagnet is used to create a magnetic field.

The three main parts of the electromagnet are the iron core, that is the magnet, which is a small round, or square brick-like. The wire, wire, is made up of copper. The electricity source, by which electricity is given to the electromagnet.

Examples of electromagnets are induction cookers, doorbell rings, etc. They are controllable and adjustable magnets and are used in most electric appliances.

Thus, the three parts are the iron core, copper wire, and an electricity source.

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Answer:

Don't mark me brainliest because of this but I'm pretty sure your supposed to give us the words because teachers don't give you things like that without the words you will the answer in with.

Answer:

Same as number of NUETRONS

POSITIVE charge

number of protons is the same as the atomic NUMBER

Located in the Nucleus

Larger mass than ELECTRONS

Explanation:

GOOD LUCK

Answer:

I hope this helps

Explanation:

Lewis symbols, which are also known as Lewis dot diagrams or electron dot diagrams, are diagrams that represent the valence electrons of an atom. Lewis structures, also known as Lewis dot structures or electron dot structures, are diagrams that represent the valence electrons of atoms within a molecule.

Answer:

E = 45.08×10⁻¹⁹j

Explanation:

Given data:

Energy of photon  in joule = ?

Frequency of photon = 6.8×10¹⁵ Hz

Solution:

Formula:

E = h.f

f = frequency

h = planck's constant (6.63×10⁻³⁴Js)

E = energy

Value of planck's constant is 6.63×10⁻³⁴Js.

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵  Hz

Hz = s⁻¹

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵  s⁻¹

E = 45.08×10⁻¹⁹j

Energy is the quantitative unit, which is measured in joules. The energy of a photon of UV light having the frequency  6.8×10¹⁵ Hz is 45.08×10⁻¹⁹ Joules.

Given:

Frequency of photon = 6.8×10¹⁵ Hz

Energy of a photon in joule =?

Usingt the formula of energy:

E = h x v

where,

v = frequency

h = planck's constant (6.63×10⁻³⁴Js)

E = energy

Substituting the values in the equation, we get:

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ Hz

E = 6.63×10⁻³⁴Js ×6.8×10¹⁵ s⁻¹

E = 45.08×10⁻¹⁹ Joules

Therefore, the energy of a photon in the UV region is 45.08×10⁻¹⁹ Joules

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Answer:

I think acetone has more because water is just H20

Answer:

Acetone

Explanation:

Acetone has three carbon atoms, six hydrogen atoms, and one oxygen atom.

When water has an oxygen atom and two hydrogen atoms.

Answer:

sugar

Explanation:

because sugar dissolves

in water, while flower    because it is insoluble

Answer: A double replacement because potassium ions bond with sulfate ions to form a salt

Explanation:

Answer:

The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

Explanation:

Answer:

because it is a theory

Explanation:

The best explanation for why scientific theories are modified is simply because it is a theory. Theories are created as a set of suppositions that help humanity understand something that would otherwise be unexplainable. Since they are not proven through scientific facts but instead are more of ideas that help further our understanding of a phenomenon, they tend to be modified as new ideas are introduced and others are proven to be false/wrong.

Answer:

it s not on periodic table this is not real element

Explanation:

Answer:

D. create metal works of art. The bronze age was the age of crafting out of metal. So, using swords of metal would fit directly into the bronze age as they're metal.

Answer:

The answer is

[tex] \huge 4\%[/tex]

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual mass = 6.25 g

error = 6.25 - 6 = 0.25

So we have

[tex]p(\%) = \frac{0.25}{6.25} \times 100[/tex]

We have the final answer as

Hope this helps you

Answer:

that's so easy but if you still need the answer i am willing to help

Explanation:

Answer:

Your answer is D (gain enough kinetic energy to get past each other.)

Explanation:

Melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.

Melting is the process by which a substance changes from the solid phase to the liquid phase. Melting is also known as fusion, although this term has several meanings in science.

Melting occurs when the kinetic energy of a solid increases by application of heat or pressure, such that the molecules of solid start vibrating faster but stay close to their neighboring particles, rolling around each other. This particle movement allows the substance to flow and form a liquid.

Therefore, melting can be best described as a process in which molecules gain enough kinetic energy to get past each other and the correct option is option D.

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Answer:

D. What is the effect of a boat’s shape on its speed?

Explanation:

Kinetic energy can be defined as the energy possessed by an object or body due to its motion. It is the amount of work required to accelerate an object or body with a specific mass from its point of initial rest to a final velocity.

Mathematically, kinetic energy (K.E) is equal to 1/2(mv²).

Hence, the question which would involve the investigation of kinetic energy is "what is the effect of a boat’s shape on its speed?" because speed is directly related to the motion of the boat. Generally, the shape of the hull of a boat has an effect on the speed of the boat.

Answer:

What is the effect of a boat’s shape on its speed?

Answer:

1. Write the symbol and charge of the cation (metal) first and the anion (nonmetal) second. 2. Transpose only the number of the positive charge to become the subscript of the anion and the number only of the negative charge to become the subscript of the cation

Answer:

By just counting sigma bond and lone pair in central atom , one can easily find hybridization.

CO2 sp

SO2 sp2

NH3 sp3

BCl3 sp2

Answer:

Liquid

Explanation:

The substance had appears to have a fixed volume but took the shape of the bottle it was transferred to.

If the substance doesn't have the same volume, the answer would be gas.

1. v= 20 miles/hr

2. d = 45 miles

Velocity is a vector that has both magnitude and direction

Velocity is the ratio of distance per time

Can be formulated :

[tex]\tt v=\dfrac{d}{t}[/tex]

v , m/s

d , m

t, s

1. d = 40 miles

t = 2 hr

[tex]\tt v=\dfrac{40~miles}{2~hr}\\\\v=20~miles/hr[/tex]

2. maybe you meant the distance traveled

v = 15 miles/hr

t = 3 hr

[tex]\tt d=v\times t\\\\d=15\times 3\\\\d=45~miles[/tex]

Answer:

C

Explanation:

4.They are different states of the same pure substance

moisture, condensation, and temperature. 2. Evaporation and condensation are part of how a cloud forms.

Answer:

Chemical reaction involved is:

CaCO

3

→CaO+CO

2

Molar mass of CaCO

3

=40+12+16×3=100 g

According to the balanced reaction 100 g of CaCO

3

produces 1 mol of CO

2

i.e. 22.4 L at STP.

∴50 g CaCO

3

will produce

100

22.4

×50=11.2 L CO

2

at STP.

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Considering the reaction stoichiometry, from the balanced equation and reation stoichiometry, the number of moles of calcium  oxide produced is 1 mole.

Chemical reactions are characterized by the appearance of new substances from others. That is, they are processes in which the nature of the substances changes, that is, from some initial substances called reagents, totally different ones called products are obtained.

In this case, you know that the balanced reaction is:

CaCO₃ → CaO + CO₂

Stoichiometry establishes relationships between the molecules or elements that make up the reactants of a chemical equation with the products of said reaction. In other words, stoichiometry determines the ratios between reactants and products in a chemical reaction.

The stoichiometry of a chemical reaction is perfectly established by the chemical equation. In it, the formulas of reactants and products appear preceded by numbers (the stoichiometric coefficients) that indicate the proportions according to which the transformation occurs.

The stoichiometric coefficients of a chemical equation are due to the fact that the atoms present before the reaction must be the same after the reaction, even though the atoms will have been rearranged to produce new substances.

In this case, by reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

In summary, from the balanced equation and reation stoichiometry, the number of moles of calcium  oxide produced is 1 mole.

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Answer:

D.

Explanation:

Translation:

A. make a barbecue

B. organize a picnic

C. swimming in the pool

D. to go skiing

Barbecue is usually a summer activity, so we eliminate that.

It would be too cold for a picnic!

It would be too cold to go swimming, and that's more of a summer thing!

Skiing is a snow activity, and since it is winter, it is likely to know.

SOMEONE ANSWER DA QUESTON

Answer :The reason why compression is more difficult is a direct illustration of quantum mechanics.

Answer:

The acceleration of a moving object can be calculated by dividing the change in velocity by the change in TIME

Explanation:

Took the practice