Please help fast it's timed!




The subscripts in any molecular compound determine the ratio of atoms in a sample of the substance.

True

False​

Answer:

During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. Then, via respiration processes, cells use oxygen and glucose to synthesize energy-rich carrier molecules, such as ATP, and carbon dioxide is produced as a waste product

Answer:

Anaesthesia & Intensive Care Medicine

Volume 6, Issue 9, 1 September 2005, Page 294

Force, mass and acceleration

Author links open overlay panelPhilDalrympleaRichardGriffithsb

https://doi.org/10.1383/anes.2005.6.9.294

Get rights and content

Abstract

Force, mass and acceleration are everyday words but often used inaccurately. Force is a physical influence, which when applied to an object causes it to accelerate in the direction from which it was applied. Mass is the amount of matter in an object and is expressed in kilograms. Acceleration is the rate of change of velocity of an object in the same straight line of the unbalanced force. When forces become balanced, there is no net force and therefore no movement. Newton’s second law links these three terms and concerns the effect that an unbalanced force has on the motion of an object. It states that the rate of change of velocity of an object is directly proportional to the force applied and takes place in the direction of the force. It is summarized by the equation: Force (N) = mass (kg) × acceleration (m/s2). Thus, an object of constant mass accelerates in proportion to the force applied. Gravity is the variable force of attraction between any two objects. All matter possesses gravitational ‘pull’ towards other matter. The amount of gravity between two objects is dependent on their mass and the distance between their centres. The word ‘weight’ in its proper context refers to the downward vertical force exerted on an object as a result of the earth’s gravity. An object with greater mass is therefore subjected to a greater gravitational force (i.e. it has greater weight).

Answer:

I think it will 25 this is the answer of this qn

neutrons : atomic mass - atomic number so

53-25

28 is the answer

Answer:

14

Explanation:

The new pressure would be = 4.46 atm

Given

V₁=6.7 L(at STP, 1 atm 273 K)

V₂=1.5 L

Required

The new pressure

Solution

Boyle's Law  

At a constant temperature, the gas volume is inversely proportional to the pressure applied  

[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]

P₂ = (P₁V₁)/V₂

P₂ = (1 atm x 6.7 L)/1.5 L

P₂ = 4.46 atm

Answer:

the metallic objects not sticking to a magnet

Answer:

D because electron is negatively charge around the nucleus

electrons are found outside the nucleus

An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.

Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons.  Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.

The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.

The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull  from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.  

To find more on electrons, refer here:

https://brainly.com/question/1255220

#SPJ5

Answer:

Mass = 63.19 g

Explanation:

Given data:

Number of moles of Cl₂ = 0.89 mol

Mass in gram = ?

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of Cl₂ = 71 g/mol

by putting values,

Mass = 0.89 mol × 71 g/mol

Mass = 63.19 g

7.4797 g AlF₃

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Stoichiometry

Step 1: Define

[RxN] 2AlF₃ + 3K₂O → 6KF + Al₂O₃

[Given] 15.524 g KF

Step 2: Identify Conversions

[RxN] 6 mol KF = 2 mol AlF₃

Molar Mass of K - 39.10 g/mol

Molar Mass of F - 19.00 g/mol

Molar Mass of Al - 26.98 g/mol

Molar Mass of KF - 39.10 + 19.00 = 58.1 g/mol

Molar Mass of AlF₃ - 26.98 + 3(19.00) = 83.98 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 5 sig figs.

7.47966 g AlF₃ ≈ 7.4797 g AlF₃

Answer:

the answer is C

Explanation:

Answer:C B

Explanation:

Answer:

True

Explanation:

A mole is defined as 6.02214076 × 1023 of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Answer:

Mg: 52.9%

Br: 47.1%

Explanation:

Answer:

453.6/58/2=453.6/2.9=156.314 grains

The number of grains in a 453.6 g (1lb.) bag of rice is equal to 157 grains of rice.

The weight can be described as the force acting due to gravity. Weight can be considered as a vector quantity if the gravitational pull is acting on the body.

Therefore, in free fall, the weight of the object would be zero. Therefore, terrestrial objects can be weightless while ignoring air resistance.

The unit for measurement of weight is the same as of force, which is the newton. A body with a mass of 1 kilogram will exhibit a weight of about 9.8 Newton on the surface of the Earth, and about 1/6th as much weight on the Moon.

Given the weight of the 20 grains = 58 g

The weight of one grain = 58/20 = 2.9 g

The number of grains (n) of rice in weight 453.6 g of the bag of rice  can be calculated as:

n = 453.6/2.9

n = 156.4 ≈ 157

Therefore, the number of grains can be considered equal to 157 grains of rice.

Learn more about weight, here:

brainly.com/question/13040516

#SPJ2

Answer:

Likely the reason behind carrying them in liquid for is to condense them. liquid takes up far less space than gases do and will last far longer. they can be transformed back into gases through heating them back up. To keep them solid would require frigid temperatures but liquid will transfer more easily through space.

Answer:

when a substance is heated it gains thermal energy. Therefore its particles move faster and its temperature rises. when a substance is cool it loses thermal energy which causes its particles to move more slowly and its temperature to drop

A substance gains thermal energy when it is heated. As a result, its temperature increases, and its particle motion accelerates.

Thermal energy is the heat energy that is given to a substance when its temperature is increased.

As we know, all matter are made up of atoms, and atoms are made up of charged particles. These particles become random or come in motion when they get thermal energy or heat.

When substances get thermal energy or heat energy. They become active, and the particles move apart from each other.

So, due to thermal energy, the atoms become loose, and the substance loses its shape, the temperature decrease the atoms come closer to each other.

Thus, when a substance cools, thermal energy is lost, which slows down the movement of its particles and lowers the substance's temperature and vice versa.

To learn more about thermal energy, refer to the link:

https://brainly.com/question/11278589

#SPJ2

Explanation:

The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants. The three layers are the middle lamella, primary cell wall, and secondary cell wall

Answer:

The cell wall is an outer protective membrane in many cells including plants, fungi, algae, and bacteria. ... The main functions of the cell wall are to provide structure, support, and protection for the cell. The cell wall in plants is composed mainly of cellulose and contains three layers in many plants.

Explanation:

Answer:

the answer is C

Explanation:

Explanation is C

Answer: the answer above is wrong, the correct answer is: Did continental drift cause the extinction of the megalodon

Explanation:

Answer:

To make proteins....

It is used to make amino acids in our body which in turn make proteins.

Explanation:

hope it was helpful.....

Answer:

Transform boundary

Explanation:

The boundary that is a site of recurring earthquake and faulting activities is the transform boundary.

At a transform boundary, there is a significantly high prevalence of earthquakes and faulting.

Answer:

This informative text, written in easily understood language, will allow those without a mechanical engineering background to understand air calculation and ventilation problems.

Answer:

please brainliest

Explanation:

the equation formula answer is [tex]x^{2} fxb\sqrt{3[/tex]

Answer:

the equation formula answer is x2 fxb[tex]\sqrt{3}[/tex]

Answer:

Thermal heating and cooling

Explanation:

This process described results from thermal heating and cooling as a mechanism of mechanical weathering of rock bodies.

Answer:

Electrons

Explanation:

In nuclear fission, atomic nuclei split into lighter atoms through loss of protons and neutrons (such as through loos of a beta particles - 2 protons and 2 neutrons). ... Electrons are not involved in nuclear reactions. Electrons are mainly involved in chemical

Answer:

what kind of class u in like dam

Explanation:

Answer:

Here is the answers I got 8 out of 8 correct :D))

Explanation: