Exams & Certification

Lucinda wants to build a square sandbox, but she has no way of measuring angles. Explain how she can make sure that the sandbox is square by only measuring length. A. Arrange four equal-length sides so the diagonals bisect each other. B. Arrange four equal-length sides so the diagonals are equal lengths also. C. Make […]

There are 20 nickels in one dollar. Write an equation to find the number of nickels n in any number of dollars d The Correct Answer and Explanation is: Correct Answer: The equation is: n=20dn = 20dn=20d Where: Explanation: To solve problems like this, we need to understand the relationship between dollars and nickels. One

Assess your understanding of incompletely dominant and codominant traits by clicking and dragging the labels to the correctly complete each sentence, and then arrange the sentences in a logical order. B Drag the text blocks below into their correct order. heterozygote in this situation, a displays a phenotype that is intermediate between that of the

Write the formulas for the following ionic compounds: 12. potassium dichromate 13. gold(III) oxide 14. aluminum periodate 15. barium nitrite 16. silver carbonate 17. lithium sulfite 18. zinc hydrogen carbonate 19. iron(III) hydroxide 20. ammonium phosphate 21. copper(II) bromite 22. SO2 23. N2S 24. BF3 25. PBr3 26. SiO2 27. SF6 28. NO2 29. nitrogen

Balanced equation: NaHCO3 + HCl -> NaCl + H2O + CO2 Find the moles from 1.03 grams of CO2 produced. The Correct Answer and Explanation is: To find the number of moles of carbon dioxide (CO₂) produced from 1.03 grams, we use the molar mass of CO₂ and the formula:Moles=Mass (g)Molar Mass (g/mol)\text{Moles} = \frac{\text{Mass (g)}}{\text{Molar Mass (g/mol)}}Moles=Molar Mass (g/mol)Mass (g)​

What is the balanced equation for the reaction of NaHCO3 with hydrochloric acid (HCl)? 1 NaHCO3 + 1 HCl –> 1 NaCl + 1 CO2 + 1 H2O The Correct Answer and Explanation is: The balanced equation for the reaction of sodium bicarbonate (NaHCO3) with hydrochloric acid (HCl) is: NaHCO3 + HCl → NaCl +

The function d(h)=5e-0.4h can be used to find the number of milligrams d of a certain drug that is in a patient’s bloodstream h hours after the drug has been administered. When the number of milligrams reaches 2, the drug is to be administered again. a. How many milligrams will be present after 1 hour?

Consider the chirality center in the compound below. What is the highest priority substituent group? (CH3)CCl Incorrect: C(OH)CH2CH3 Substituent priority is determined by atomic numbers, working outward from the chirality center. (CH3)Br -(CH3)CH(CH3)2 not by the highest total mass of the entire substituent group. OH OH What is the second highest priority substituent group? (CH3)CCl

Ammonia gas reacts with aqueous nitric acid to form aqueous ammonium nitrate, a fertilizer. (a) Write the balanced chemical equation for the reaction, including the physical states. (b) Write the complete ionic and the net ionic equations for the reaction. The Correct Answer and Explanation is: (a) Balanced Chemical Equation (with physical states):NH₃(g) + HNO₃(aq)

Title: Balanced Equations for the Reaction of Aqueous Nitric Acid and Aqueous Ammonia Balanced equation representing aqueous nitric acid and aqueous ammonia reacting: 4HNO3(aq) + NH3(aq) → NH4NO3(aq). Identify all of the phases in your answer. Balanced net ionic equation representing aqueous nitric acid and aqueous ammonia reacting: H+(aq) + OH-(aq) → H2O(l). Identify all