Which of the following contains only one
type of atom?
A. element
B. solution
C. compound

Answer:

Silicon

Explanation:

Therefore the isotope with 14 protons and 15 neutrons is Silicon-29.

An atom has 15 protons and 14 Neutrons. The atomic number of this atom is 14 and the element is silicon.

The atomic number of an element is its total number of protons or the total number of electrons. The atomic number is written down the element. It can be calculated by knowing the numbers of protons and electrons.

The element here is silicon, whose number of protons, electrons, and neutrons are equal, which is 14. These are the charged particles that are present in the atoms of the element.

The number of band protons is equal to an element. The atomic number will be its number of protons. The isotope with 14 protons and 15 neutrons is Silicon-29.

Thus, the atomic number of the element is 14 if it has 15 protons and 14 Neutrons. The element is silicon.

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Answer:

Explanation:

Answer:

it would take 2 years

Explanation:

93/55=1.69--->1.70------>2

Answer:

0.44mol

Explanation:

1mol/102g=xmol/45.1g

-> x=(45.1x1)/102

x=0.44mol

Answer:

Prudent execution of experiments requires not only sound judgment and an accurate assessment of the risks involved in the laboratory, but also the selection of appropriate work practices to reduce risk and protect the health and safety of trained laboratory personnel as well as the public and the environment. Chapter 4 provides specific guidelines for evaluating the hazards and assessing the risks associated with laboratory chemicals, equipment, and operations. Chapter 5 demonstrates how to control those risks when managing the inventory of chemicals in the laboratory. The use of the protocols outlined in Chapter 4 in carefully planned experiments is the subject of this chapter.

Explanation:

Answer: Carbon, hydrogen oxygen

Explanation:C2H5OH

Answer:

1) chemical indicators won't work above it's pH range so therefore it probably won't change colour.

2) the solution should be clear and colourless to see colour change.

3) indicators tend to be of low accuracy so it's not 100% reliable.

Answer:

false

Explanation:

false

Answer:  8556 mm, or 855.6 cm (8560 mm to 3 sig figs)

Explanation:  Convert mm to cm by dividing by 10 (1cm/10mm)

Find the area of the foil face in cm^2 (30cm*0.2020cm) = 0.606 cm^2

Calculate the volume occupied by 1.40 kg of foil in cm^3.  1.40kg = 1400g

1.400g/(2.7 g/cm^3) = 518.5 cm^3 for 1.40 kg Au

   Volume = Area (of the face) * Length  

We want Length:

Length = Volume/Area

L = (518.5 cm^3/0.606 cm^2)

L = 855.6 cm (8556 mm)  Round to 3 sig figs (856 cm and 8560 mm)

Answer:

the number of protons is called the atomic number

hope it helps you buddy

Answer: number of protons in an atom

Explanation:

Answer:

Ethylenediaminetetraacetic acid (EDTA), heparin, and citrate are the most commonly used anticoagulants (39–41). pls mark me branilest

Answer:

c

Explanation:

took test on usa testprep

When gas in a discharge tube is excited to higher energy level after some seconds they return to the ground level by releasing energy in the form of light. Thus energy jumps by electron due to excitation is correct option.

A gas discharge tube is an electronic devise containing inert gases that ionizes and conducts results in  emission of light.

When a potential  is applied between the electrodes in a gas discharge tube, and the pressure is reduced, the gas particles inside forms a plasma of ions.

The electrons released when excited to higher energy level by absorbing energy and returns to the initial state by emitting energy in the form of light, the discharge tube glows.

The color emitted by the discharge tube vary based on the gas in the tube. Each type of gaseous ions emit different colors.

Therefore, the light emission in gas discharge tube is due to energy hike during electron excitation and then relaxing by emitting the light energy. Thus, option c is correct.

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Answer:

5H²O= 23

ZnCl²=135

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Hello!

Answer:

Hydrogen

Explanation:

Hydrogen (H) has one electron in its outermost shell, but it is not classed as an alkali metal since it is not a metal but a gas at room temperature.

Answer:

hydrogen, lithium, sodium element are not alkali metal

Answer:

58

Explanation:

mass number of iron 58 is 58

Given that the radius of a silver atom is 145 pm, it would take [tex]7.97 \times 10^{6}[/tex] silver atoms laid side by side to span a distance of 2.31 mm.

The radius of a silver atom is 145 pm. Then, the diameter (twice the radius) is:

[tex]d = 2 \times 145 pm = 290 pm[/tex]

We will convert 290 pm to millimeters. We will use the conversion factors:

[tex]290 pm \times \frac{1m}{10^{12}pm } \times \frac{10^{3}mm }{1m} = 2.90 \times 10^{-7} mm[/tex]

If the diameter of 1 silver atom is 2.90 × 10⁻⁷ mm, the number of silver atoms required to span a distance of 2.31 mm is:

[tex]2.31 mm \times \frac{1Ag\ atom}{2.90 \times 10^{-7}mm } = 7.97 \times 10^{6} Ag\ atom[/tex]

[tex]7.97 \times 10^{6}[/tex] silver atoms span a distance of 2.31 mm.

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Cu2+ is the correct answer!

Answer:

the other variable is also doubled

Explanation:

direct proportion, same thing has to happen to both variables

Answer:

6)

a). 5.6 × 10⁵

b) 3.34 × 10⁴

c) 4.12 × 10_⁴

Answer:s  its  a mixture

Explanation:

Answer:

3 ZnBr2(aq) + 2Al (s) ====>2AlBr3 (aq) + 3 Zn(s),

Answer:

10 ml

Explanation:

The graduated cylinder contains 19 ml of water before the silver pellet is placed inside. Afterwards, the graduated cylinder measures 29 ml of water. Therefore the pellet displaced 10 ml of water. ( 29ml - 19ml = 10ml )

Explanation:

Alcohol burning

hope this helps you

Answer:

Dosage of drugs is dependent on the body weight of a person. The route of administration also plays crucial role in determining the dosage of the drugs. The calculation of dosage of drugs based on the bodyweight is calculated by the multiplication of body weight and dosage.

Explanation:

The medication dosage is given as 45mg/kg. To calculate the mass of dosage a child will require of body weight 33.5lb will be:

[tex]\text{Dose} = \text{Body weight} \times \text{Dosage}[/tex]  

Therefore, converting the pounds to kg, it will be:

[tex]33.5\;\text{lb} = 15.19\;\text{ kg} \;(1\;\text{lb} = 0.4\;\text{ kg})[/tex]

Thus, dose of medication required will be:

[tex]\text{Dose} = 15.19 \: \times \: 45[/tex]

[tex]\text { Dose} = 683.8\: \text { mg}[/tex]

Compounds are made of more than one element hence water is made of 2 Hydrogen and one Oxygen, but nacent Hydrogen is single hence it is an element.

Answer:

https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:linear-equations-graphs/x2f8bb11595b61c86:slope/v/graph-from-point-slope. Answer 1

Explanation:

I only know the first one