01/01/19

A washer and a dryer cost 821 combined. The washer costs 79 less than the dryer. What is the cost of the dryer?

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01/01/19

what happens when albumin is placed in the cell and nacl is placed out
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12/31/18

My son is seven times older than my grandson and I am 12 times older than my grandson. If you add all our ages together, the sum is 100 years. Can you tell me my age in years?
My son is seven times older than my grandson and I am 12 times older than my grandson. If you add all our ages together, the sum is 100 years. Can you tell me my age in years?
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12/31/18

Stoichiometry Problem
One impure sample of CaCO3 is treated with 100.00mL of 1.00mol/L HCl. The resulting solution is diluted to 250.00 ML and 25.00 ML of this solution required 20.00mL of 0.10mol/L NaOH for... more
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12/31/18

How do metallic salts and carbonates cause irrigation problems for farmlands?
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12/31/18

400 ml of a gas (@STP) has a mass of 0.792 g. What is the molecular mass of this gas?
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12/31/18

Manganese and oxygen form a compound with an empirical formula of MnO2. If the actual molecular mass of of the compound is 173.8 g, what is the molecular formula?
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12/30/18

What is the abbreviated electron configuration for nickel (atomic number 28)?A) [He]2s22p3B) [Ar]4s23d8C) [Kr]4s23d8D) [Ar]4s24p4E) [Ar]3d8
Can you please explain how to figure out the answer!!
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12/30/18

Which of the following is a neutralization reaction?A) KCl + NaNO3→KNO3+ NaClB) HNO3+ KOH →H2O + KNO3C) H2O + SO3→H2SO4D) 4Na + O2→2Na2OE) 2NO2→2NO + O2
I understand that Neutralization is a reaction between an acid and a base to produce a salt plus water. How can i identify what is a acid and whats a base?
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12/30/18

Which one of the following compounds will be insoluble in water?A) AgNO3B) CaCl2C) NH4ClD) CaCO3E) Pb(C2H3O2)2
I know the answer is D. I dont understand why...Ca is a metal and C and O are non metals wouldn't that be an ionic bond?
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12/30/18

chemistry- concentration
What is the concentration, in mass percent, of a solution prepared from 50.0 g NaCl and 150.0 g of water?
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12/29/18

Two chemical reactions are shown: C + O2 → CO2 CO2 + H2O → H2CO3 Which statement is true?
Two chemical reactions are shown: C + O2 → CO2 CO2 + H2O → H2CO3 Which statement is true? Both are synthesis reactions. Both are decomposition reactions. A is a synthesis reaction, and B is a... more
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12/29/18

Which of the following compounds could have the molecular formula C7H16?A) hexaneB) pentaneC) 2-methylheptaneD) 2,3-dimethylpentaneE) 3-ethylhexane
How would i figure this out? Please explain!
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12/29/18

The correct formula for sulfuric acid isA) H2SO4.B) H2SO3.C) H2SO4-.D) H2SO3-.E) SO42
Can you please explain to me the steps in figuring out the correct answer.
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12/29/18

Which of the following is a neutralization reaction?A) KCl + NaNO3→KNO3+ NaClB) HNO3+ KOH →H2O + KNO3C) H2O + SO3→H2SO4D) 4Na + O2→2Na2OE) 2NO2→2NO + O2
How do i know which one to choose? please explain!
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12/29/18

Chemistry- moles, volume

A patient needs to receive 85 grams of glucose every 12 hours. What volume of a 5.0%(m/v) glucose solution needs to be administered to the patient each 12 hours?
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12/29/18

What volume of a 1.5 M KOH solution is needed to provide 3.0 moles of KOH?
i understand that the answer is 2. But can you please explain how you get to the answer being 2?What volume of a 1.5 M KOH solution is needed to provide 3.0 moles of KOH?
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12/29/18

Compounds that are soluble and insoluble in water.
tWhich one of the following compounds will be insoluble in water?A) AgNO3B) CaCl2C) NH4ClD) CaCO3E) Pb(C2H3O2)2 How do i know which compound is insoluble?
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12/28/18

perform the following conversions 2.38 meters to yards
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12/27/18

If it is -20 degrees in Alaska and 75 in Florida, what is the difference in temperatures?
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12/27/18

How many grams of oxygen are needed to produce 17.5 of ZnO
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12/26/18

How many mLs of a 1 M Lithium Chloride solution needs to be added to make a 3% Lithium Chloride solution?
I need to make a 3%, 1%, and 0.3% Lithium Chloride solution in 1 liter of water. There will be a 1 M Lithium Chloride stock solution. How many mL of the stock solution need to be added to make the... more
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12/25/18

How many ions in 1 mol of melted Sodium chloride?
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12/23/18

In order to generate an action potential, the dendrites of a neuron first receive signals from messenger molecules released from adjacent neurons. These messengers molecules are called what?
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12/22/18

If we schedule two teachers for the same subject, a) Is it a conflict ? b) Will the tutors know that my son is taking tutoring from two different tutors for the same subject ?
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