A person tries to pour exactly one kilogram of sand onto a scale on five
different occasions. The actual amounts he pours are shown below:
0.80 kg, 0.90 kg, 1.0 kg, 1.1 kg, 1.2 kg
Which of the following best describes his results?
A. While inconsistent, his average of 1.0 kg made his results quite
accurate
O
B. His results were very consistent.
O
C. His results were both precise and accurate.
O
D. His results were very precise.

"An advertisement for a commercial hand warmer claims that the hand warmer works because a chemical reaction in the hand warmer draws out the body’s own natural heat causing a warming effect"

Explanation:

Hand warmer

        A) Crystalline type

        B) Air activated

        C) Lighter

        D) Battery

        E) Charcoal

Answer:

false

Explanation:

Answer:

metals? I'm not 100% sure, sorry if I'm wrong.

Answer:

                     284.88 grams of CO₂

Explanation:

Data Given:

                  Volume  =  V  =  145 L

                  Standard Temperature  =  T  =  273.15 K

                  Standard Pressure  =  P  =  1 atm

                  Universal Gas Constant  =  R  =  0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹

                  Moles  =  n  =  ??

Formula Used:

                         Assuming that the CO₂ gas is acting ideally we will apply Ideal Gas equation;

                                P V  =  n R T

Solving for n,

                               n  =  P V / R T

Putting values,

                n  =  1 atm × 145 L / 0.08205 L⋅atm⋅K⁻¹⋅mol⁻¹ × 273.15 K

                n  =  6.47 mol

Secondly, Moles are converted to Mass as;

Moles  =  Mass / M.Mass

Solving for Mass,

Mass  =  Moles × M.Mass

Mass  =  6.47 mol × 44.01 g/mol

Mass =  284.88 grams of CO₂

Answer: A

both permanent magnet and electromagnets.

i hope that helps

Final answer:

A permanent magnet can affect both other permanent magnets and electromagnets, as well as metals such as iron and nickel. It cannot attract non-metals like plastic or wood and can also exert a force on charged particles when they are in motion.

Explanation:

The question concerns the effects a permanent magnet can have on various objects and fields, particularly addressing what a permanent magnet can affect. A permanent magnet can affect both other permanent magnets and electromagnets by exerting a magnetic force on them. Magnets can also affect objects made of materials that are attracted to magnets, such as iron and nickel. These materials are typically metals, not non-metals like plastic or wood, which do not respond to magnetic fields.

Furthermore, a magnetic field can exert a force on charged particles, such as electrons, when they are in motion. This is a fundamental principle of electromagnetism, a branch of physics that studies the interaction between electricity and magnetism. Consequently, the correct answer to the question is that a permanent magnet can affect both permanent magnets and electromagnets.

Yo sup??

The correct answer is option B ie

both living and non living things.

Hope this helps

The correct answer is that both living and nonliving things are made of matter. The correct option is: both living and nonliving things.

Living organisms and inanimate objects alike are composed of matter. Essentially, matter is the "stuff" that constitutes everything in existence. Anything that occupies space and has mass qualifies as matter, which consists of various chemical substances.

Therefore, the accurate answer to the question "What is made of matter?" encompasses both living and nonliving entities. This includes everything from the air we breathe to the earth beneath our feet, the food we consume, and our own bodies.

For example, the chair you're sitting on and the meal you had for lunch are both made of matter. Matter, defined as anything that has mass and takes up space, includes all tangible objects in the universe, whether living or nonliving.

Answer: 3.25x10²⁴ atoms Zn

Explanation: Convert moles of Zn to atoms using Avogadro's number

5.4 moles Zn x 6.022x10²³ atoms Zn/ 1 mole Zn

= 3.25x10²⁴ atoms Zn

Answer: m= 58.8 g Kr

Explanation: solution attached:

Find first the number of moles for Kr.

Use Ideal gas law formula PV= nRT and derive for n.

Convert moles to mass using the molar mass of Kr.

Answer:

pumice and gneiss

Explanation:

both are formed by conduction of energy

Final answer:

To balance the chemical equation C4H10 + O2 -> CO2 + H2O, we need to put coefficients in front of the molecules so that the number of atoms of each element is the same on both sides of the equation. The balanced equation is C4H10 + 13/2 O2 -> 8 CO2 + 10 H2O.

Explanation:

To balance the chemical equation C4H10 + O2 -> CO2 + H2O, we need to make sure that the number of atoms of each element is the same on both sides of the equation.

Starting with carbon (C), we have 4 carbon atoms on the reactant side and 1 carbon atom on the product side. To balance carbon, we can put a coefficient of 2 in front of CO2, giving us 2 carbon atoms on the product side.

Next, let's look at hydrogen (H). We have 10 hydrogen atoms on the reactant side, but only 2 hydrogen atoms on the product side. To balance hydrogen, we can put a coefficient of 5 in front of H2O, giving us 10 hydrogen atoms on the product side.

Finally, let's balance oxygen (O). We have 2 oxygen atoms on the reactant side and 2 oxygen atoms in CO2, giving us a total of 4 oxygen atoms on the product side. The equation is now balanced: C4H10 + 13/2 O2 -> 8 CO2 + 10 H2O.

Answer:

You can do three experiments and take the average result.

Explanation:

Repeating an experiment establishes two things: reproduciblity and repeatability. These are two different but connected terms.

Reproducibility: This refers to the degree of agreement in the results conducted by different individuals at different locations using different instruments. The experiments are subject to many conditions such as temperature, humidity, human error, instrument error etc.

Repeatability on the other hand, is a measure of how repeatable an experiment is by using same instruments. In other words, the experiment must be replicated elsewhere and still generate the same results or close to that.

To establish the either of the two, three experiments will be sufficient. This means that for the results, there will be a lower value, middle value, and upper value.

The average result is a combination of the results and divided by the number of experiments, in this case, 3.

One advantage of doing 3 experiments is that you get a quick representative of how the results are.

The human use of coal impacts air and water quality significantly. The burning of coal results in air pollution, contributing to global health and environmental issues. Additionally, processes related to coal use also contaminate local water bodies, damaging aquatic ecosystems and affecting the safety of drinking water.

The human use of coal has significant impacts on both air and water quality. When coal is burned for energy, it releases pollutants, including sulfur dioxide and nitrogen oxides into the atmosphere. These substances can lead to air pollution, contributing to issues like acid rain, smog, respiratory diseases, and global warming.

Coal mining and combustion also affect water quality. Acid mine drainage, where water in coal mines becomes acidic and leaks out, can contaminate local water bodies, harming aquatic life and making the water unsafe for human consumption. Moreover, coal-fired power plants often discharge waste materials containing heavy metals like mercury into water bodies, further deteriorating water quality.

https://brainly.com/question/32849086

#SPJ2

Answer:

option a is answer

Explanation:

suppose we take an example of sodium chloride is always used in medicines

Answer:it’s b

Explanation: trust meh Brodie

Answer:

1.0511458x10^22

Explanation:

0.633 mol/ 1 x 6.022x10^23/1 mol

Double displacement reaction:

A double replacement or displacement reaction, the process in which two compounds react and interchange positive cations and negative anions of two reagents, and created two new forms of compounds or products.

Conditions:

A feature of this is that two compounds are reagents and two various compounds are products.

Production of insoluble precipitate

           [tex]A g N O_{3}(a q)+N a C l(a q) \rightarrow A g C l(s)+N a N O_{3}(a q)[/tex]

Production of an insoluble gas

          [tex]N a_{2} S(a q)+2 H C l(a q) \rightarrow 2 N a C l(a q)+H_{2} S(g)[/tex]

Production of water

         [tex]H N O_{3}(a q)+K O H(a q) \rightarrow K N O_{3}(a q)+H_{2} O(l)[/tex]

Examples:

An example is the reaction between silver nitrate and sodium chloride. Silver converts a nitrite ion to a sodium chloride ion, and sodium absorbs a nitrate anion.

           [tex]A g N O_{3}+N a C l \rightarrow A g C l+N a N O_{3}[/tex]

Also, other example as below

           [tex]\mathrm{CuCl}_{2}(a q)+2 A g N O_{3}(a q) \rightarrow C u\left(N O_{3}\right)_{2}(a q)+2 A g C l(s)[/tex]

There are two equivalent ways to maintain a double displacement equation: cation exchange or anion exchange.

Answer:

3.95 oz

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

Apple iPhone = 112 g

Step 2: Identify Conversions

1 lb = 454 g

1 lb = 16 oz

Step 3: Convert

[tex]112 \ g(\frac{1 \ lb}{454 \ g} )(\frac{16 \ oz}{1 \ lb} )[/tex] = 3.94714 oz

Step 4: Check

We are given 3 sig figs. Follow sig fig rules and round.

3.94714 oz ≈ 3.95 oz

Final answer:

The weight of an Apple iPhone can be calculated by converting the mass from grams to pounds and then from pounds to ounces which results in approximately 3.94 ounces.

Explanation:

To find the weight of an Apple iPhone in ounces, we can use the conversion factors provided. Given that 1 pound (lb) is equal to 16 ounces (oz) and 1 pound (lb) is equivalent to 454 grams (g), we can convert the mass of the iPhone from grams to pounds and then from pounds to ounces.

First, convert the mass of the iPhone from grams to pounds:

112 g ÷ 454 g/lb = 0.246 lb

Next, convert the mass in pounds to ounces:

0.246 lb × 16 oz/lb = 3.9376 oz

Therefore, the weight of the Apple iPhone is approximately 3.94 ounces.

Answer:

mol H2S = 1.28 mol

Explanation:

balanced reaction:

∴ moles HCl = 2.56 mol

⇒ moles H2S = ?

⇒ moles H2S = (2.56 mol HCl)*(mol H2S/2 moles HCl)

⇒ moles H2S = 1.28 mol

Answer: Endothermic reaction.

Explanation:  A chemical reaction in which energy is absorbed from the surrounding environment.

Explanation:

Skin Deep is developed by AAAS and funded by Neutrogena. I think

cell membrane part of a cell has a function that is similar to your skin, it protect the human body from harsh environment.

The cell membrane of a cell is a thin selectively semi-permeable membrane which covers the cell by surrounding cell cytoplasm, the major component of cell membrane are protein and lipid where the major lipid is phospholipid.

The proteins are different types present in bilayer membrane such as peripheral, intrinsic and extrinsic protein; Some major organelles of the cell have cell membrane such as nucleus and mitochondria.

The function of cell membrane is to protect the cell, maintain the  integrity of the internal environment, act as a base of attachment for cell to cell communication like cytoskeleton, helps in transport of nutrients into the cell and outside of the cell.

It only allows the molecules and ions maintain the specific physical/chemical properties, is a protective layer surrounding a cell, it allows waste to leave the cell.

Learn more about cell membrane, here:

https://brainly.com/question/13524386

#SPJ2

Answer:

4,270 Joules

Explanation:

The heat of fusion of water is 334 j/g. So, the equation would be (12.8 g)(334 j/g) which comes to 4,270 joules.

Written out that's just twelve point eight times three hundred and thirty four.

To melt 12.8g of ice at 0 degrees Celsius, one would need 4275.2 joules of energy. This is calculated by multiplying the mass of the ice (12.8g) by the heat of fusion for ice (334 J/g).

To determine how many joules are required for melting 12.8g of ice at 0 degrees Celsius, we should use the known heat of fusion for ice. The heat of fusion of ice is 334 J/g, which is the amount of energy needed to convert 1 gram of ice at its melting point into 1 gram of water at the same temperature without changing its temperature.

The calculation is straightforward:

In this case:

Energy required = 334 J/g × 12.8 g = 4275.2 J

Therefore, 4275.2 joules of energy are required to melt 12.8g of ice at 0 degrees Celsius.

Answer:

The sample of nitrogen must be taken to 267 C

Answer:

moles of H2O = 4.5 mol

Explanation:

balanced equation:

∴ mass SnO2 = 339 g

∴ molar mass SnO2 = 150.71 g/mol

⇒ moles SnO2 = (339 g)(mol/150.71 g) = 2.25 mol SnO2

⇒ moles H2O = (2.25 mol SnO2)(2 mol H2O/mol SnO2)

⇒ moles H2O = 4.5 mol H2O

Answer:

im pretty sure its b. sand and iron

ik that magnetism easily separates iron

Answer:

Set an alarm for five hours after your bedtime.

Go to sleep as usual.

When the alarm goes off, stay up for 30 minutes. Enjoy a quiet activity like reading.

Fall back asleep.

Explanation:

Answer:

juice wrld jk

Explanation:

Answer:

They are averages.

Explanation:

atomic numbers on periodic tables are derived from the average value of all the isotopes of the element. So being averages they are sometimes not integers.

Answer:

The sum of the number of protons and neutrons in an atom is called the mass number.  Atomic mass is never an integer number for several reasons: The atomic mass reported on a periodic table is the weighted average of all the naturally occurring isotopes. Being an average it would be most unlikely to be a whole number.

Explanation:

The increase in pressure will result in the decrease of the total number of gas molecules due to the shift in equilibrium toward the side with fewer moles of gas, following Le Châtelier's principle.

According to Le Châtelier's principle, how will a pressure increase affect a system that includes matter in the gas phase and another phase? The correct answer is D. The total number of gas molecules will decrease. This is because Le Châtelier's principle states that a pressure increase will shift an equilibrium toward the side of the reaction with the fewer number of moles of gas, as this helps to counteract the change by reducing the pressure within the system. This principle is particularly useful when predicting how a change in pressure will affect the position of equilibrium in a chemical reaction involving gases.

Final answer:

Le Châtelier's principle indicates that increased pressure in a gaseous reaction shifts equilibrium toward the side with fewer gas molecules to reduce the stress caused by the pressure increase.

Explanation:

According to Le Châtelier's principle, a pressure increase in a system involving gases will cause a shift in equilibrium towards the phase with the fewer number of gas molecules. In the case of a reaction with different numbers of gas molecules on each side of the reaction, such as 2NO(g) + O₂(g) ⇒ 2NO₂(g), an increase in pressure would shift the equilibrium towards the formation of NO₂, since it has fewer gas molecules (2) compared to the reactants (3). This phenomenon occurs because the system responds to reduce the pressure by favoring the production of fewer molecules that would occupy less volume.

Answer:

2H2O + 1O2 → 2H2O2

Explanation:

by semiractions:

(1)      2 H2O  →  H2O2  + 2H+

(2)      2H+  +  O2  →   H2O2

(1) + (2):

⇒ 2H2O + O2   →   2H2O2

                     4 - O - 4

                     4 - H - 4

Answer:

It stays àt 80j

Explanation:

The total energy of the isolated system remains 80 J as the gravitational potential energy is converted into kinetic energy in a frictionless environment, maintaining conservation of energy.

As the box slides down the frictionless slide, the total energy of the system remains constant due to the conservation of energy principle. The initial 80 J of gravitational potential energy is progressively converted into kinetic energy as the box moves down the slide. Since the slide is frictionless, there are no dissipative forces like friction to convert mechanical energy into heat. Hence, the isolated system, which includes the box, slide, and earth, will still store 80 J of total energy, but in different forms (mostly kinetic energy when the box is at the bottom of the slide).

the electrostatic forces are [tex]10^{36}[/tex] larger than the gravitational force

Explanation:

Let's do the calculation by using two molecules of hydrogen, each containing 2 atoms of hydrogen.

The gravitational force between the two molecules is given by:

[tex]F=\frac{G m_1 m_2}{r^2}[/tex]

where

[tex]G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}[/tex] is the gravitational constant

m1 and m2 are the masses of the two molecules: since they are identical,

[tex]m_1 = m_2 = 2m_p = 1.67\cdot 10^{-27} kg[/tex], twice the mass of the proton

r is the distance between the two  molecules

The force can be rewritten as

[tex]F_G=\frac{Gm_p^2}{r^2}[/tex]

We can assume instead that electrostatic force between the two molecules is given by the interaction between the positively charged nuclei and the neatively charged electrons. Therefore,

[tex]F_E=\frac{kq_1 q_2}{r^2}[/tex]

where

[tex]k=8.99\cdot 10^9 Nm^{-2}C^{-2}[/tex] is the Coulomb's constant

[tex]q_1 = q_2 = 2e[/tex] is the magnitude of the charge of each molecule, where

[tex]e=1.6\cdot 10^{-19}C[/tex] is the fundamental charge

r is the distance between the two molecules

So the force can be  rewritten as

[tex]F_E=\frac{ke^2}{r^2}[/tex]

Therefore, the ratio between the two forces is:

[tex]\frac{F_E}{F_G}=\frac{ke^2}{Gm_p^2}=\frac{(8.99\cdot 10^9)(1.6\cdot 10^{-19})^2}{(6.67\cdot 10^{-11})(1.67\cdot 10^{-27})^2}\sim 10^{36}[/tex]

So, the electrostatic forces are [tex]10^{36}[/tex] larger than the gravitational force.

Learn more about electric force:

brainly.com/question/8960054

brainly.com/question/4273177

Learn more about gravitational force:

brainly.com/question/1724648

brainly.com/question/12785992

#LearnwithBrainly