Question

chemistry chapter 1 - 4 crossword review
across
2 a 27.092 g object has a density of 0.941 g per ml. its volume is - eight.eight ml
6 convert: 0.458 liters = 458 liters
7 convert: 4.125 meters = 412.5 meters
8 ending substance in a chemical reaction
9 mass divided by volume... responsible for determining whether an object sinks or floats in water
12 the substance formed when we heated the iron - sulfur mixture in the \kinds of change\ lab was a... it is called iron sulfide and had different chemical and physical properties than the simple iron - sulf mixture
13 steel rusting is an example of a change
15 convert: 3.57 grams = 0.00357 grams
17 convert: 344 k = seventy - degrees celsius
20 a sample of salt water is since you cannot distinguish the dissolved particles of nacl from the water it is dissolved in
21 the substance we start with in a chemical reaction
23 the number of significant figures in 4.0500 g
24 \i am tall.\ is an example of a observation
25 a type of mixture where the components are easily distinguishable and able to be physically separated from one another
27 the si unit of mass
28 a broad and well - tested explanation of why experiments give certain results
down
1 the si unit of volume
3 the density of gasoline is approximately 0.66 g per ml. 50.0 ml of gasoline would have a mass of - three g
4 ice, water and steam are examples of how h2o exists in all 3 of matter
5 use c + 273 to convert to this temperature scale
8 paper being shredded is an example of a change
10 zinc is an example of an
11 another name for a homogeneous mixture
14 law of of mass says that matter cannot be created or destroyed... the mass of the products in a reaction will always equal the mass of the reactants you began with
16 7.55 m x 0.34 m - 2.567 m^2... when rounding, there should be significant figures in the final answer
18 a method of testing a hypothesis
19 the number of significant figures in 23.570 ml
22 the si unit of length
26 45.9 g of liquid mercury occupies 3.38 ml. according to these values, mercurys density is 13._ g per ml

Explanation:

Step1: Recall density formula

The density formula is $
ho=\frac{m}{V}$, where $
ho$ is density, $m$ is mass and $V$ is volume. For the first - across question, we know $m = 27.092$ g and $
ho=0.941$ g/mL. We can solve for $V$ by rearranging the formula to $V=\frac{m}{
ho}$.
$V=\frac{27.092}{0.941}=28.8$ mL.

Step2: Unit conversion knowledge

For unit - conversion questions:

• 1 liter = 1000 mL, so 0.458 liters = 458 mL.
• 1 meter = 100 cm = 1000 mm, 4.125 meters = 412.5 cm.
• 1 gram = 0.001 kg, so 3.57 grams = 0.00357 kg.
• To convert from Kelvin to Celsius, use the formula $T_{C}=T_{K}-273$. So $344$ K $=(344 - 273)=71^{\circ}$C.

Step3: Chemical concepts

• The ending substance in a chemical reaction is the product.
• Mass divided by volume is density.
• When iron - sulfur mixture is heated, a new substance iron sulfide is formed, which is a compound.
• Steel rusting is a chemical change.
• A sample of salt water where you can't distinguish dissolved particles is a homogeneous mixture.
• The starting substance in a chemical reaction is the reactant.
• The number of significant figures in 4.0500 g is 5.
• "I am tall" is a qualitative observation.
• A mixture with distinguishable components is a heterogeneous mixture.
• The SI unit of mass is the kilogram.
• A well - tested explanation for experimental results is a theory.
• The SI unit of volume is the cubic meter, but in common laboratory use, liter (L) or milliliter (mL) are also used.
• For gasoline with $

ho = 0.66$ g/mL and $V = 50.0$ mL, $m=
ho V=0.66\times50.0 = 33$ g.

• Ice, water and steam are examples of the three states of matter of $H_{2}O$.
• Using $C + 273$ converts to the Kelvin scale.
• Paper being shredded is a physical change.
• Zinc is an element.
• Another name for a homogeneous mixture is a solution.
• The law of conservation of mass states that matter cannot be created or destroyed.
• For $7.55\times0.34-2.567$, first calculate $7.55\times0.34 = 2.567$, then $2.567-2.567 = 0$. In multiplication and division, the result should have the same number of significant figures as the number with the least significant figures in the values being multiplied or divided. Here, 0.34 has 2 significant figures, so the answer should have 2 significant figures.
• The number of significant figures in 23.570 mL is 5.
• The SI unit of length is the meter.
• For mercury with $m = 45.9$ g and $V = 3.38$ mL, $

ho=\frac{m}{V}=\frac{45.9}{3.38}=13.6$ g/mL.

Answer:

1. 28.8
2. mL
3. cm
4. product
5. density
6. compound
7. chemical
8. kg
9. one
10. homogeneous mixture
11. reactant
12. 5
13. qualitative
14. heterogeneous mixture
15. kilogram
16. theory
17. cubic meter
18. 33
19. states
20. Kelvin
21. physical
22. element
23. solution
24. conservation
25. 2
26. experiment
27. 5
28. meter
29. 6