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4 years ago

A lamp has a mass of 8 kg. What is the weight of the lamp?

Chemistry

2 answers:

valkas [14]4 years ago

6 0

Answer: 78 N

Explanation: Weight is the downward force acting on an object due to gravity.

$w=m\times g$

w= weight of an object

m= mass of object

g= gravity = $9.8 ms^{-2}$

$w=8kg\times 9.8ms^{-2}=78.4kgms^{-2}=78Newton$

$(1kgms^{-2}=1N)$

____ [38]4 years ago

3 0

78. g on earth is 9.8 m/s^2 so F=ma and plugging in gives you F=(8kg)(9.8m/s^2) which is closest to 78 N.

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The point on a phase diagram at which all phases occur simultaneously is called the: -end point

Assoli18 [71]

Answer:The boiling point

Explanation:

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3 years ago

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Which of these is not an example of a possible additive used in ink?

tiny-mole [99]

Answer:

greases

Explanation:

Ink is manufactured in two stages: first varnish (a mixture of solvent, resins and additives) is made and then pigments are mixed into it. Varnish is a clear liquid that solidifies as a thin film. It binds the pigment to the printed surface, provides the printability of the ink and wets the pigment particles. Ink made with color usually includes the following ingredients: petroleum distillate solvent, linseed oil, some form of organic pigments, and soybean oil. Inorganic pigments are not commonly used.

Additives play a critical role in the formulation and production of inks, helping to impart the necessary characteristics the ink needs, whether it is to run more smoothly on press or to protect the finished product.

However, grease is not one of the likely additives to ink hence it is not essentially used in ink production.

8 0

3 years ago

A sample of argon gas (molar mass 40 g) is at four times the absolute temperature of a sample of hydrogen gas (molar mass 2 g).

katen-ka-za [31]

Answer:

Ratio of Vrms of argon to Vrms of hydrogen = 0.316 : 1

Explanation:

The root-mean-square speed measures the average speed of particles in a gas, and is given by the following formula:

Vrms = $\sqrt{3RT/M}$

where R is molar gas constant = 8.3145 J/K.mol, T is temperature in kelvin, M is molar mass of gas in Kg/mol

For argon, M = 40/1000 Kg/mol = 0.04 Kg/mol, T = 4T , R = R

Vrms = √(3 * R *4T)/0.04 = √300RT

For hydrogen; M = 1/1000 Kg/mol = 0.001 Kg/mol, T = T, R = R

Vrms = √(3 * R *T)/0.001 = √3000RT

Ratio of Vrms of argon to that of hydrogen = √300RT / √3000RT = 0.316

Ratio of Vrms of argon to that of hydrogen = 0.316 : 1

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4 years ago

Nomenclature of this compound spammers will be reported

kogti [31]

Answer:

Nomenclature is the process of naming chemical compounds with different names so that they can be easily identified as separate chemicals. ... For example, organic compounds include molecules with carbon rings and/or chains with hydrogen atoms (see picture below).01-Jul-2014

Nomenclature: Iron (II) Chloride

Compound: FeCl2

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2 years ago

A cold pack manufacturer has decided to change the chemical in their cold pack from ammonium nitrate to ammonium chloride, a saf

My name is Ann [436]

Answer: Tfinal = 7.1°C

Explanation:

heat released or absorbed = mass × specific heat capacity × change in temperature

q = m × cg × ΔT (eqn 1)

Note: ΔT = (Tfinal - Tinitial)

(q = ? ΔHsoln=25.7kJ/mole = 25700J/mole; mass of solution, m = 100 + 35g = 135g; cg = specific heat capacity of water = 4.18 J°C-1g-1; ΔT = ? masss of solute, NH4NO3 = 35g, molar mass of solute, NH4NO3 = 80g)

molar enthalpy of solution, ΔHsoln = heat absorbed or released ÷ moles of solute, n

ΔHsoln = q ÷ n

q = ΔHsoln × n

moles solute, n = mass solute (g) ÷ molar mass solute (g mol-1)

moles of solute, n = 35g/80g/mol = 0.4375 moles

q = 25700J/mol × 0.4375 mol = 11243.75J

From equation 1 above, ΔT = q / (m × cg) = 11243.75J / (135 × 4.18 J°C-1g-1) = 19.9°C

Since the reaction is endothermic, Tinitial > Tfinal, therefore, Tfinal = Tinitial - ΔT = 27 - 19.9 = 7.1°C

4 0

4 years ago