Chemistry College

Question 2 (1 point)
Which is true for water?
It is a compound
It is an element
It is a chemical reaction
It is a metal

Question 2 (1 Point)Which Is True For Water?It Is A Compound It Is An Element It Is A Chemical ReactionIt

Answers

Answer 1
Water is a compound because it is made up of water molecules.
Answer 2
water is a compound made from hydrogen and oxygen or H2O

Related Questions

A flashbulb of volume 1.70 mL contains O2(g) at a pressure of 2.30 atm and a temperature of 29.0 °C. How many grams of O2(g) does the flashbulb contain?

Answers

The flashbulb contains approximately 0.00291 grams of O₂(g).

The ideal gas law relates the pressure (P), volume (V), temperature (T), and amount of gas (n) through the equation PV = nRT, where R is the universal gas constant. Rearranging this equation to solve for n gives n = PV/RT.

To find the amount of O₂(g) in the flashbulb, we first need to convert the volume to liters and the temperature to Kelvin:

V = 1.70 mL = 0.00170 L

T = 29.0 °C + 273.15 = 302.15 K

We can then use the ideal gas law to calculate the amount of O₂(g):

n = PV/RT

n = (2.30 atm)(0.00170 L)/(0.0821 L·atm/mol·K)(302.15 K)

n = 9.10 × 10⁻⁵ mol O₂

Finally, we can convert from moles to grams using the molar mass of O₂:

m = n × M

m = (9.10 × 10⁻⁵ mol)(32.00 g/mol)

m = 0.00291 g O₂

As a result, the flashbulb contains around 0.00291 grams of O₂(g).


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1. Someone Please help me! List the main types of EMR that have an impact on living tissue. Explain this impact and provide examples from this lesson.

2. Eating one banana is equivalent to receiving 0.01 mrem. How many bananas would you have to consume before you risk increasing your probability of developing cancer? Explain your answer.

Answers

1. The main types of EMR that have an impact on living tissue are ionizing radiation and non-ionizing radiation. Ionizing radiation has enough energy to remove tightly bound electrons from atoms, which can cause damage to DNA and other biological molecules. Examples of ionizing radiation include gamma rays, X-rays, and high-energy UV radiation. Non-ionizing radiation has lower energy levels and does not have enough energy to remove electrons from atoms. However, it can still cause damage to biological molecules through other mechanisms, such as heating. Examples of non-ionizing radiation include visible light, radio waves, and low-energy UV radiation.

2. Eating one banana is equivalent to receiving 0.01 mrem of radiation. The average person in the US receives about 300 mrem of radiation per year from natural sources, such as cosmic rays and radon gas. The risk of developing cancer from radiation exposure depends on the dose received, with higher doses increasing the risk. According to the National Cancer Institute, the risk of developing cancer from radiation exposure is about 5% per 1000 mrem of exposure. This means that eating 33,000 bananas (33,000 x 0.01 mrem = 330 mrem) would increase the risk of developing cancer by about 5%. However, this is a very high number of bananas, and it is unlikely that anyone would eat this many bananas in a short period of time. In general, the risk of developing cancer from eating bananas or other natural sources of radiation is very low compared to other sources of radiation exposure, such as medical imaging or nuclear accidents.

You are a scientist studying the effects of hydration on a person's ability to recover from the effects of VarGoViv, a virus that destroys hair follicles. You find 30 people who have VarGoViv and who normally drink about 8 oz of water per day.

You count the number of hair follicles on a marked 3" x 3" section of their head at the start of the experiment.

You tell 10 of them to drink their usual 8 cups of water a day.

You tell 10 of them to drink 12 cups of water a day.

You tell 10 of them to drink 16 cups of water a day.

The people keep up with your directions for two week. At the end of the two weeks, you count the number of hair follicles in the same section to see how the number of hair follicles changed.

What is the independent variable in this experiment?

A. The number of people in each group
B. The color of hair for each person
C. The number of hair follicles in the marked section.
D. The different amounts of water consumption

Answers

A scientist can conduct an experiment by infecting hair follicle cells with the VarGoViv virus in vitro and then treating them with different concentrations of the electrolyte solutions.

The recovery of hair follicle cells can be assessed by measuring various parameters such as cell viability,the morphology, and proliferation rates. The experiment can be designed to test different types of electrolytes such as sodium, potassium, magnesium, and calcium ions at varying concentrations. By analyzing the data, the scientist can determine the optimal concentration and type of electrolyte solution that promotes the recovery of the hair follicle cells from VarGoViv virus infection.

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--The complete Question is, What is the effect of different concentrations of electrolyte solutions on the recovery of hair follicles from VarGoViv virus infection in vitro? --

A covalent compound is broken down into its individual elements. The amount of energy required to break the bonds is 1254 kJ, and the energy produced as a result of breaking the bonds is 1001 kJ. What type of reaction has most likely occurred?
a. combustible reaction
b. spontaneous reaction
c. endothermic reaction
d. exothermic reaction

Answers

Answer: c. endothermic reaction.

Explanation: In an endothermic reaction, energy is absorbed or required to break the bonds in the reactants. This means that more energy is required to break the bonds than is released by the formation of new bonds in the products, resulting in a net absorption of energy. In this case, the amount of energy required to break the bonds (1254 kJ) is higher than the energy produced by breaking the bonds (1001 kJ), indicating that the reaction requires an input of energy and is therefore endothermic.

Answer:

c. endothermic reaction

Explanation:

The given information states that the amount of energy required to break the bonds of the covalent compound is 1254 kJ, and the energy produced as a result of breaking the bonds is 1001 kJ.

In an endothermic reaction, the energy required to break the bonds is greater than the energy released or produced. This means that more energy is absorbed from the surroundings than is released during the reaction. In this case, since the energy required to break the bonds (1254 kJ) is greater than the energy produced (1001 kJ), it indicates that the reaction requires an input of energy from the surroundings, making it an endothermic reaction.

Option c, "endothermic reaction," is the correct answer based on the given information.

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